/* ==========================================================================
   Toss Style Design Tokens & Variables
   ========================================================================== */
:root {
  interpolate-size: allow-keywords;
  --color-primary: #007aff;
  /* Apple iOS System Blue */
  --color-primary-hover: #0071e3;
  --color-primary-light: #f5f5f7;
  --color-bg-primary: #f5f5f7;
  /* Apple light gray page background */
  --color-bg-secondary: #f5f5f7;
  /* Same light gray for consistent section layouts */
  --color-border: #e5e8eb;
  --color-text-main: #1d1d1f;
  --color-text-body: #1d1d1f;
  --color-text-muted: #86868b;
  --color-white: #ffffff;

  --font-sans:
    -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  --header-height: 72px;

  /* Hero theme tokens (default: blue, overridden by .theme-orange) */
  --hero-primary: #007aff;
  --hero-primary-hover: #0071e3;
  --hero-orb1-color: rgba(0, 122, 255, 0.18);
  --hero-orb2-color: rgba(94, 92, 230, 0.15);
  --hero-glow-shadow: rgba(0, 122, 255, 0.15);
  --hero-glow-box: rgba(0, 113, 227, 0.2);
  --hero-cursor-color: %23007aff;
}

/* ==========================================================================
   Hero Section Themes
   ========================================================================== */

/* Blue theme (default – 정연희.jpg) */
.intro-section.theme-blue {
  --hero-primary: #007aff;
  --hero-primary-hover: #0071e3;
  --hero-orb1-color: rgba(0, 122, 255, 0.18);
  --hero-orb2-color: rgba(94, 92, 230, 0.15);
  --hero-glow-shadow: rgba(0, 122, 255, 0.15);
  --hero-glow-box: rgba(0, 113, 227, 0.2);
  --hero-cursor-color: %23007aff;
}



/* ==========================================================================
   Base Styles & Reset
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  word-break: keep-all;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-body);
  line-height: 1.65;
  font-size: 15px;
  letter-spacing: -0.022em;
  cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='46' height='46' viewBox='0 0 24 24' fill='%23007aff'><path d='M5.5 3.21v15.58l3.89-3.89h6.81z' stroke='white' stroke-width='1.5' stroke-linejoin='round'/></svg>"), auto;
}

a,
button,
details,
summary,
.btn,
.nav-link,
.project-summary {
  cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='46' height='46' viewBox='0 0 24 24' fill='%23007aff'><path d='M5.5 3.21v15.58l3.89-3.89h6.81z' stroke='white' stroke-width='1.5' stroke-linejoin='round'/></svg>"), pointer;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-text-main);
  font-weight: 700;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-hover);
}

ul,
ol {
  list-style: none;
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */
.text-blue {
  color: var(--color-primary);
}

/* Inside hero section, override to use hero theme primary */
.intro-section .text-blue {
  color: var(--hero-primary);
  transition: color 0.5s ease;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(49, 130, 246, 0.15);
}

.btn-outline:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-body);
  border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-text-muted);
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  z-index: 1000;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-container {
  max-width: 960px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-main);
  letter-spacing: -0.5px;
}

.header-logo:hover {
  color: var(--color-primary);
}

.header-nav ul {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  position: relative;
  padding: 8px 0;
  display: block;
}

.nav-link:hover:not(.disabled) {
  color: var(--color-text-main);
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.nav-link.disabled {
  color: var(--color-border);
  cursor: not-allowed;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link.disabled:hover {
  color: var(--color-border);
}

.badge {
  font-size: 9px;
  font-weight: 600;
  padding: 2px 6px;
  background-color: #f2f4f6;
  color: #8b95a1;
  border-radius: 6px;
}

/* ==========================================================================
   Sections General
   ========================================================================== */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-top: -16px;
  margin-bottom: 32px;
}

/* ==========================================================================
   Hero & Intro Section
   ========================================================================== */
.intro-section {
  position: relative;
  overflow: hidden;
  height: 100vh;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding-top: var(--header-height);
  margin: 0;
  z-index: 1;
}

.intro-section .container {
  position: relative;
  z-index: 2;
}

/* -- Background Ambient Glow Orbs -- */
.hero-bg-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.orb-mover {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.45;
  pointer-events: none;
}

.orb-1 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--hero-orb1-color) 0%, transparent 70%);
  top: -50px;
  left: 10%;
  animation: float-orb-1 25s ease-in-out infinite alternate;
}

.orb-2 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, var(--hero-orb2-color) 0%, transparent 70%);
  bottom: -100px;
  right: 5%;
  animation: float-orb-2 30s ease-in-out infinite alternate;
}

@keyframes float-orb-1 {
  0% {
    transform: translate(0, 0) scale(1);
  }

  50% {
    transform: translate(40px, 60px) scale(1.08);
  }

  100% {
    transform: translate(-20px, -30px) scale(0.95);
  }
}

@keyframes float-orb-2 {
  0% {
    transform: translate(0, 0) scale(1);
  }

  50% {
    transform: translate(-60px, -40px) scale(0.95);
  }

  100% {
    transform: translate(30px, 50px) scale(1.05);
  }
}


.avatar-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
  margin: -50px auto -30px auto;
  /* Offsets empty space of larger wrapper to keep spacing tight */
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.avatar-wrapper.avatar-initial-hide {
  opacity: 0;
  transform: scale(0.85);
  pointer-events: none;
}

.avatar-capsule-badge {
  position: absolute;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 12px;
  border-radius: 9999px;
  background-color: var(--color-white);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  pointer-events: none;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.avatar-wrapper:hover .avatar-capsule-badge,
.avatar-wrapper:focus-within .avatar-capsule-badge {
  opacity: 0;
  transform: translate(-50%, 8px) scale(0.95);
}

/* White profile container inside (transparent to show profile image) */
.avatar-container {
  position: relative;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  overflow: hidden;
  box-shadow: 0 0 0 3px #ffffff, 0 8px 24px rgba(0, 0, 0, 0.06);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

/* Quick Nav Buttons */
.quick-nav-btn {
  position: absolute;
  top: calc(50% - 28px);
  left: calc(50% - 28px);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: #ffffff;
  color: var(--color-text-muted);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
  opacity: 0;
  pointer-events: none;
  transform: translate(0, 0) scale(0.5);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease, background-color 0.2s, color 0.2s;
}

.quick-nav-btn svg {
  width: 22px;
  height: 22px;
}

.quick-nav-btn:hover {
  background-color: var(--hero-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--hero-glow-box);
}

/* Radial expand positions on wrapper hover */
.avatar-wrapper:hover .quick-nav-btn,
.avatar-wrapper:focus-within .quick-nav-btn {
  opacity: 1;
  pointer-events: auto;
}

/* Arc layout:
   CV: top-right (x = 100px, y = -100px)
   GitHub: middle-right (x = 140px, y = 0)
   Email: bottom-right (x = 100px, y = 100px)
*/
.avatar-wrapper:hover .btn-cv,
.avatar-wrapper:focus-within .btn-cv {
  transform: translate(100px, -100px) scale(1);
}

.avatar-wrapper:hover .btn-github,
.avatar-wrapper:focus-within .btn-github {
  transform: translate(140px, 0px) scale(1);
}

.avatar-wrapper:hover .btn-email,
.avatar-wrapper:focus-within .btn-email {
  transform: translate(100px, 100px) scale(1);
}

/* Hover effects for the avatar container */
.avatar-wrapper:hover .avatar-container,
.avatar-wrapper:focus-within .avatar-container {
  transform: scale(1.08);
  box-shadow: 0 0 0 3px #ffffff, 0 12px 30px var(--hero-glow-shadow);
  /* Premium Apple static glow */
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-title {
  font-size: 40px;
  line-height: 1.3;
  letter-spacing: -1.2px;
}

.hero-subtitle {
  font-size: 20px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: -8px;
}

.hero-description {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 16px;
  color: var(--color-text-body);
}

.hero-links {
  display: none;
  /* Hidden on desktop, shown on mobile */
  gap: 12px;
  margin-top: 24px;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-links.links-initial-hide {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 13.5px;
  font-weight: 600;
  border-radius: 9999px;
  /* Premium Pill Shape */
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1.5px solid var(--color-border);
  background-color: var(--color-white);
  color: var(--color-text-body);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  text-decoration: none;
  gap: 6px;
  user-select: none;
}

.hero-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
  border-color: var(--color-text-muted);
}

.hero-btn:active {
  transform: scale(0.97);
  background-color: var(--color-primary-light);
}

.hero-btn.btn-cv {
  background-color: var(--hero-primary);
  color: var(--color-white);
  border-color: var(--hero-primary);
  box-shadow: 0 4px 12px var(--hero-glow-shadow);
}

.hero-btn.btn-cv:hover {
  background-color: var(--hero-primary-hover);
  border-color: var(--hero-primary-hover);
  box-shadow: 0 6px 16px var(--hero-glow-box);
}

.hero-btn.btn-cv:active {
  background-color: var(--hero-primary-hover);
}

/* Scroll Indicator (Desktop Only) */
.hero-scroll-indicator {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-main);
  user-select: none;
  pointer-events: auto;
  cursor: pointer;
  z-index: 10;
  transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s ease;
}

.hero-scroll-indicator:hover {
  color: var(--hero-primary);
}

.hero-scroll-indicator.indicator-initial-hide {
  opacity: 0;
  transform: translate(-50%, 10px);
  pointer-events: none;
}

.scroll-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: arrow-bounce 2.0s infinite;
}

@keyframes arrow-bounce {
  0%, 100% {
    transform: translateY(0);
    animation-timing-function: ease-in;
  }
  50% {
    transform: translateY(14px);
    animation-timing-function: ease-out;
  }
}

/* Typewriter Cursor */
.typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1.15em;
  background-color: var(--hero-primary);
  margin-left: 4px;
  vertical-align: -3px;
  animation: cursor-blink 0.8s steps(2, start) infinite;
}

@keyframes cursor-blink {
  0%, 100% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
}


/* ==========================================================================
   Career Section
   ========================================================================== */
.career-section {
  background-color: var(--color-bg-secondary);
}

.career-card {
  background-color: var(--color-white);
  border: none;
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.02), 0 1px 2px rgba(0, 0, 0, 0.01);
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.career-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.02);
}

.career-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 36px;
  cursor: pointer;
  list-style: none;
  user-select: none;
  gap: 16px;
}

.career-header::-webkit-details-marker {
  display: none;
}

.company-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-main);
}

.team-role {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.career-period {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* 데스크탑: 모바일용 날짜 숨김 */
.career-period-mobile {
  display: none;
}

.career-intro {
  font-size: 15px;
  color: var(--color-text-body);
  line-height: 1.65;
}

.career-summary-text {
  margin-bottom: 24px;
}

.career-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 768px) {
  .career-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.contribution-card {
  background-color: #f5f5f7;
  /* Apple light gray */
  border-radius: 14px;
  padding: 20px;
  border: none;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contribution-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.02);
}

.card-icon-container {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--color-white);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 10px;
  letter-spacing: -0.3px;
}

.card-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
}

.card-bullets li {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 6px;
  position: relative;
  padding-left: 12px;
}

.card-bullets li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* ==========================================================================
   Projects Accordion Section
   ========================================================================== */
.accordion-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-details {
  border: none;
  border-radius: 20px;
  background-color: var(--color-white);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.02);
  transition:
    transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-details:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.03), 0 2px 8px rgba(0, 0, 0, 0.01);
}

.project-details[open] {
  box-shadow: 0 20px 48px rgba(0, 122, 255, 0.08), 0 4px 16px rgba(0, 122, 255, 0.02);
}

.project-details[open]:hover {
  transform: none;
  box-shadow: 0 20px 48px rgba(0, 122, 255, 0.08), 0 4px 16px rgba(0, 122, 255, 0.02);
}

.project-summary {
  padding: 32px 36px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}

.project-summary::-webkit-details-marker {
  display: none;
}

.project-summary-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-right: 16px;
}

.project-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-main);
}

.project-meta {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: 2px;
  margin-bottom: 2px;
}

.project-lead-in {
  font-size: 13.5px;
  color: var(--color-text-body);
  font-weight: 400;
  margin-top: 2px;
}

.project-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.arrow-icon {
  transition:
    transform 0.25s ease,
    stroke 0.25s ease;
}

.project-details[open] .arrow-icon {
  transform: rotate(180deg);
}

.project-details[open] .arrow-icon path {
  stroke: var(--color-primary);
}

/* Override details default hiding to allow smooth close animation */
.project-details:not([open])> :not(summary) {
  display: grid;
}

/* Smooth Accordion Content Animation via CSS Grid & discrete display transition */
.details-content-wrapper {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s cubic-bezier(0.16, 1, 0.3, 1), display 0.35s;
  transition-behavior: allow-discrete;
  overflow: hidden;
}

.project-details[open] .details-content-wrapper {
  grid-template-rows: 1fr;
}

.details-inner-content {
  min-height: 0;
  padding: 32px 32px 32px 32px;
  border-top: 1px solid rgba(229, 232, 235, 0.5);
}

/* Tech Stack Badge List */
.tech-stack-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 0;
  margin-bottom: 20px;
}

.tech-badge {
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  background-color: #f2f4f6;
  color: #4e5968;
  border-radius: 8px;
  border: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.tech-badge:hover {
  background-color: #e5e8eb;
  color: #333d4b;
  transform: translateY(-1px);
}

/* Vertical Stack Layout for Project Details (Full Width for both text & image) */
.project-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
}

.project-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Refined Typography Hierarchy: Block titles styled as clean labels */
.block-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 0;
}

.process-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Clean, non-overlapping detail list hierarchy */
.process-list li strong {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--color-text-main);
  display: inline-block;
  vertical-align: middle;
  margin-bottom: 4px;
}

.process-list li p {
  font-size: 14px;
  color: var(--color-text-body);
  margin-bottom: 0;
  line-height: 1.6;
}

.process-list li p em {
  font-style: normal;
  font-weight: 600;
  color: var(--color-primary);
  margin-right: 6px;
}

.achievement-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: disc;
  margin-left: 18px;
}

.achievement-list li {
  font-size: 14px;
  color: var(--color-text-body);
}

/* Image Styling - Stacked below the text */
.project-image-container {
  width: 100%;
  margin-top: 24px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.project-image {
  max-width: 100%;
  max-height: 480px;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: zoom-in;
}

.project-image:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.zoomable-placeholder {
  width: 100%;
  min-height: 200px;
  background-color: var(--color-bg-secondary);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.zoomable-placeholder:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.03);
}

.placeholder-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  padding: 32px;
}

.placeholder-text {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Education & Certifications Section
   ========================================================================== */
.education-section {
  background-color: var(--color-bg-secondary);
}

.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: relative;
  padding-left: 28px;
}

/* Left border line for timeline */
.timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  bottom: 8px;
  width: 2px;
  background-color: rgba(229, 232, 235, 0.6);
}

.timeline-item {
  position: relative;
  cursor: default;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item:hover {
  transform: translateX(6px);
}

/* Dot on the timeline */
.timeline-item::before {
  content: "";
  position: absolute;
  top: 4px;
  left: -34px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-white);
  border: 3px solid var(--color-border);
  z-index: 2;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item:hover::before {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  transform: scale(1.15);
  box-shadow: 0 0 0 4px var(--color-primary-light);
}

.timeline-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 6px;
}

.timeline-title {
  font-size: 15px;
  font-weight: 700;
  transition: color 0.3s ease;
}

.timeline-item:hover .timeline-title {
  color: var(--color-primary);
}

.timeline-date {
  font-size: 13px;
  color: var(--color-text-muted);
}

.timeline-desc {
  font-size: 13.5px;
  color: var(--color-text-body);
}

.certs-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.certs-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background-color: var(--color-white);
  border: 1px solid rgba(229, 232, 235, 0.6);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.005);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.certs-list li:hover {
  transform: translateY(-2px);
  border-color: rgba(49, 130, 246, 0.2);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.02);
}

.cert-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-main);
}

.cert-date {
  font-size: 13.5px;
  color: var(--color-text-muted);
}

.cert-badge {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  background-color: rgba(49, 130, 246, 0.08);
  color: var(--color-primary);
  border-radius: 20px;
  display: inline-block;
}

/* ==========================================================================
   Footer Section (Toss Style Multi-Column Layout)
   ========================================================================== */
.main-footer {
  padding: 56px 0 56px; /* Symmetrical padding at top and bottom to resolve the cramped bottom spacing on the portfolio page */
  border-top: 1px solid #f2f4f6;
  background-color: #ffffff; /* Consistent neutral white to remove bluish tint */
  color: #4e5968;
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
}

.footer-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: #191f28;
  margin-bottom: 8px;
  letter-spacing: -0.4px;
}

.footer-intro-text {
  font-size: 14px;
  color: #6b7684;
  line-height: 1.6;
  max-width: 380px;
}

.footer-header {
  font-size: 14px;
  font-weight: 600;
  color: #333d4b;
  letter-spacing: -0.2px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  display: flex;
  align-items: center;
}

.footer-links li a {
  font-size: 14px;
  color: #4e5968;
  display: inline-flex;
  align-items: center;
  transition: color 0.2s ease;
  text-decoration: none;
}

.footer-links li a:hover {
  color: var(--color-primary);
}

.footer-icon {
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  color: #8b95a1;
  transition: color 0.2s ease;
  flex-shrink: 0;
}

.footer-links li a:hover .footer-icon {
  color: var(--color-primary);
}

.footer-plain-text {
  font-size: 14px;
  color: #6b7684;
}

.footer-bottom {
  border-top: 1px solid #f2f4f6;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copyright {
  font-size: 13px;
  color: #8b95a1;
  text-align: left;
}

/* ==========================================================================
   Media Queries & Responsive Styling
   ========================================================================== */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  section {
    padding: 48px 0;
  }

  /* ── 1. 헤더 nav: 잘림 방지 ──────────────────── */
  .header-container {
    gap: 8px;
  }

  .header-nav {
    overflow: hidden;
  }

  .header-nav ul {
    gap: 14px;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 2px;
  }

  .header-nav ul::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    font-size: 12.5px;
    padding: 6px 0;
    white-space: nowrap;
  }

  .header-logo {
    font-size: 15px;
    flex-shrink: 0;
  }

  /* -- 2. Hero: 섹션 겹침 방지 (height 강제 auto) -- */
  .intro-section {
    height: auto !important;
    min-height: 100svh;
    box-sizing: border-box;
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 60px;
    overflow: visible;
  }

  /* -- 3. About: 섹션 겹침 방지 + 내부 스크롤 제거 -- */
  .about-section {
    height: auto !important;
    min-height: unset;
    box-sizing: border-box;
    padding-top: calc(var(--header-height) + 40px) !important;
    padding-bottom: 60px;
    overflow: visible;
    justify-content: flex-start;
    align-items: stretch;
  }

  /* Hero content */
  .hero-content {
    gap: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  /* 아바타: 크기 확대 및 모바일 최적화 */
  .avatar-wrapper {
    width: 140px;
    height: 140px;
    margin: 0 auto;
  }

  .avatar-container {
    width: 120px;
    height: 120px;
  }

  /* 모바일: floating 버튼과 capsule badge 숨김 */
  .quick-nav-btn {
    display: none !important;
  }

  .avatar-capsule-badge {
    display: none;
  }

  .hero-scroll-indicator {
    display: none !important;
  }

  .hero-links {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
    width: 100%;
    z-index: 5;
  }

  .hero-title {
    font-size: 26px;
    letter-spacing: -0.8px;
  }

  .hero-subtitle {
    font-size: 15px;
    margin-top: -4px;
  }

  .hero-description {
    font-size: 14px;
  }

  /* -- 4. 채팅 UI: border-radius + 말풍선 폭 -- */
  .chat-container {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  }

  .chat-messages {
    padding: 20px 14px;
    gap: 4px;
  }

  .chat-messages .message-left + .message-right,
  .chat-messages .message-right + .message-left {
    margin-top: 10px;
  }

  /* -- 채팅 아바타 완전 숨김 (specificity 확보) -- */
  .about-section .message-avatar,
  .chat-messages .message-avatar {
    display: none !important;
  }

  .about-section .message-left.no-avatar,
  .chat-messages .message-left.no-avatar {
    margin-left: 0;
  }

  .about-section .message,
  .chat-messages .message {
    gap: 0;
  }

  .about-section .message-left,
  .chat-messages .message-left {
    max-width: 90%;
  }

  .about-section .message-right,
  .chat-messages .message-right {
    max-width: 75%;
  }

  .message-bubble {
    font-size: 13.5px;
    padding: 11px 14px;
  }

  /* Career 헤더: [logo] [제목+팀+날짜 세로] [화살표] 세 칸 가로 align-center */
  .career-header {
    flex-direction: row;
    align-items: center;
    padding: 16px 20px;
    gap: 12px;
  }

  .company-logo-container {
    flex-shrink: 0;
    align-items: center;
  }

  /* 중간 영역: 회사명+팀+날짜 세로 */
  .company-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  /* 모바일에서 데스크탑용 날짜 숨김, 모바일용 날짜 표시 */
  .career-period-desktop {
    display: none !important;
  }

  .career-period-mobile {
    display: inline !important;
  }

  /* career-meta-right: 화살표만 남기고 우측 고정 */
  .career-header .career-meta-right {
    display: flex !important;
    align-items: center !important;
    flex-shrink: 0;
    gap: 0 !important;
  }

  .career-header .project-arrow {
    flex-shrink: 0;
  }

  .company-name {
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .team-role {
    font-size: 12px;
  }

  .career-period {
    font-size: 11.5px;
    color: var(--color-text-muted);
    white-space: nowrap;
  }

  .details-inner-content {
    padding: 24px 20px 24px 20px !important;
  }

  /* ── Projects Section ─────────────────────── */
  .project-summary {
    padding: 22px 24px;
  }

  .project-title {
    font-size: 15px;
    line-height: 1.4;
  }

  .project-meta {
    font-size: 12px;
  }

  .tech-stack-container {
    margin-top: 16px;
    margin-bottom: 16px;
    gap: 6px;
  }

  .tech-badge {
    font-size: 11px;
    padding: 4px 10px;
  }

  .project-team-meta {
    padding: 0;
    margin-bottom: 20px;
    gap: 8px;
  }

  .team-meta-item {
    font-size: 13px;
    flex-direction: column;
    gap: 2px;
  }

  .meta-label {
    width: auto;
  }

  .process-list {
    gap: 16px;
  }

  .process-list li {
    margin-bottom: 0;
  }

  .process-list li strong {
    font-size: 13.5px;
  }

  .process-list li p {
    font-size: 13px;
  }

  .achievement-list li {
    font-size: 13px;
  }

  .block-title {
    font-size: 11px;
  }

  /* ── Section Titles ─────────────────────────── */
  .section-title {
    font-size: 22px;
    margin-bottom: 18px;
  }

  .section-subtitle {
    font-size: 13.5px;
    margin-top: -10px;
    margin-bottom: 24px;
  }

  /* ── Education Section ───────────────────────── */
  .grid-2col {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .timeline-title {
    font-size: 14px;
  }

  .timeline-desc {
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 22px;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 13.5px;
  }

  .hero-links {
    flex-direction: column;
    width: 100%;
    gap: 8px;
  }

  .hero-btn {
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .header-nav ul {
    gap: 12px;
  }

  .nav-link {
    font-size: 12px;
  }

  .badge {
    display: none;
  }

  .project-summary {
    padding: 20px 20px;
  }

  .details-inner-content {
    padding: 20px 16px 20px 16px !important;
  }

  .career-header {
    padding: 16px 16px;
  }

  .chat-messages {
    padding: 16px 12px;
  }
}

/* ==========================================================================
   Project Link & Image Styles
   ========================================================================== */
.project-links {
  /* margin-top: 8px; */
  margin-bottom: 8px;
}

.btn-text-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.btn-text-link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.mockup-image {
  max-width: 100%;
  max-height: 500px;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   Image Viewer Modal (Lightbox)
   ========================================================================== */
.image-viewer-modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.image-viewer-modal.show {
  display: flex;
  opacity: 1;
}

.viewer-content {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 80vh;
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.image-viewer-modal.show .viewer-content {
  transform: scale(1);
}

.close-viewer {
  position: absolute;
  top: 24px;
  right: 32px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 36px;
  font-weight: 300;
  transition:
    color 0.2s ease,
    transform 0.2s ease;
  cursor: pointer;
  user-select: none;
}

.close-viewer:hover {
  color: #ffffff;
  transform: scale(1.1);
}

.viewer-caption {
  margin-top: 16px;
  text-align: center;
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px;
  font-weight: 500;
}

/* Hover effects for zoomable images */
.mockup-image,
.image-mockup img {
  cursor: zoom-in;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.mockup-image:hover,
.image-mockup img:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   Work Categorization Tags
   ========================================================================== */
.project-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 6px;
  margin-right: 8px;
  vertical-align: middle;
  line-height: 1;
  flex-shrink: 0;
  letter-spacing: -0.2px;
}

.tag-frontend {
  background-color: rgba(49, 130, 246, 0.08);
  color: #1a70e6;
}

.tag-backend {
  background-color: rgba(2, 184, 117, 0.08);
  color: #1aa064;
}

.tag-etc {
  background-color: rgba(139, 92, 246, 0.08);
  color: #7c3aed;
}

/* ==========================================================================
   Company Logo Container
   ========================================================================== */
.company-logo-container {
  display: flex;
  align-items: center;
  gap: 16px;
}

.company-logo-placeholder {
  width: 48px;
  height: 48px;
  background-color: #f2f4f6;
  color: #8b95a1;
  font-weight: 700;
  font-size: 16px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
}

.company-logo-img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  object-fit: contain;
  background-color: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.process-list li {
  margin-bottom: 0;
}

.process-list li strong {
  vertical-align: middle;
}

/* ==========================================================================
   Project Team & Role Meta Information
   ========================================================================== */
.project-team-meta {
  background-color: transparent;
  border-radius: 0;
  padding: 0;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: none;
  box-shadow: none;
}

.team-meta-item {
  display: flex;
  align-items: baseline;
  font-size: 13px;
  line-height: 1.5;
}

.meta-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  width: 90px;
  flex-shrink: 0;
}

.meta-val {
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 13px;
}

.contribution-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  background-color: rgba(49, 130, 246, 0.08);
  color: var(--color-primary);
  border-radius: 6px;
  display: inline-block;
  vertical-align: middle;
  line-height: 1;
  margin-left: 6px;
}



/* ==========================================================================
   Scroll Reveal Animation (Fade-up)
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Center-aligned Typography
   ========================================================================== */
.text-center {
  text-align: center;
}

.text-center .hero-links {
  justify-content: center;
}

.hero-avatar {
  font-size: 48px;
  margin-bottom: 16px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-8px);
  }
}

/* ==========================================================================
   Chat UI Section & Layout
   ========================================================================== */
.about-section {
  background-color: var(--color-bg-primary);
  border-bottom: 1.5px solid rgba(229, 232, 235, 0.4);
  height: 100vh;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding-top: var(--header-height);
  padding-bottom: 40px;
  margin: 0;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px 8px 20px;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 10;
}

.chat-header-left,
.chat-header-right {
  width: 44px;
  display: flex;
  align-items: center;
}

.chat-header-left {
  justify-content: flex-start;
}

.chat-header-right {
  justify-content: flex-end;
}

.chat-back-btn,
.chat-call-btn {
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
}

.chat-back-btn:hover,
.chat-call-btn:hover {
  opacity: 0.7;
}

.chat-header-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.chat-header-profile {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  background-color: #c4c4c6;
  /* Apple standard gray for initials monogram */
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-header-monogram {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-white);
  line-height: 1;
}

.chat-header-name {
  font-size: 13px;
  /* Enlarged for readability and stability */
  font-weight: 600;
  color: #1d1d1f;
  display: flex;
  align-items: center;
  gap: 2px;
  margin-top: 3px;
}

.chat-header-name svg {
  color: #86868b;
  vertical-align: middle;
}

.chat-header-email {
  font-size: 10.5px;
  /* Enlarged for visibility */
  color: #5e5e62;
  /* Darker gray for higher contrast */
  font-weight: 400;
  letter-spacing: -0.015em;
}

.chat-container {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  background-color: #fafbfc;
  border-radius: 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.chat-messages {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 6px; /* Tight spacing for consecutive messages from same sender */
  background-color: #fafbfc;
  text-align: left;
}

/* Wider margin when conversation sender switches */
.message-left + .message-right,
.message-right + .message-left {
  margin-top: 14px;
}

.message {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  max-width: 85%;
}

.message-left {
  align-self: flex-start;
}

.message-right {
  align-self: flex-end;
  flex-direction: row-reverse;
  max-width: 75%;
}

.message-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: transparent;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.chat-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.message-bubble {
  padding: 14px 18px;
  border-radius: 20px;
  font-size: 14.5px;
  line-height: 1.55;
  word-break: break-word;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.01);
}

.message-left .message-bubble {
  background-color: #e9e9eb;
  /* Apple iMessage light grey */
  color: var(--color-text-main);
  border: none;
  border-bottom-left-radius: 20px;
  /* Non-tail bubbles remain fully rounded */
}

.message-right .message-bubble {
  background-color: var(--color-primary);
  /* Toss blue, no border */
  color: var(--color-white);
  border: none;
  border-bottom-right-radius: 20px;
  /* Non-tail bubbles remain fully rounded */
}

/* Align bubbles when avatar is hidden in consecutive left messages */
.message-left.no-avatar {
  margin-left: 56px;
  /* 44px avatar width + 12px gap */
}

/* --- iMessage Style Speech Bubble Tails --- */
.message-left.has-tail .message-bubble {
  border-bottom-left-radius: 5px;
  position: relative;
}

.message-left.has-tail .message-bubble::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: -7px;
  width: 20px;
  height: 20px;
  background-color: #e9e9eb;
  border-bottom-right-radius: 16px 14px;
  z-index: -1;
}

.message-left.has-tail .message-bubble::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: -10px;
  width: 10px;
  height: 20px;
  background-color: #fafbfc;
  /* Matches chat container background */
  border-bottom-right-radius: 10px;
  z-index: 0;
}

.message-right.has-tail .message-bubble {
  border-bottom-right-radius: 5px;
  position: relative;
}

.message-right.has-tail .message-bubble::before {
  content: "";
  position: absolute;
  bottom: 0;
  right: -7px;
  width: 20px;
  height: 20px;
  background-color: var(--color-primary);
  border-bottom-left-radius: 16px 14px;
  z-index: -1;
}

.message-right.has-tail .message-bubble::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: -10px;
  width: 10px;
  height: 20px;
  background-color: #fafbfc;
  /* Matches chat container background */
  border-bottom-left-radius: 10px;
  z-index: 0;
}

/* Chat bubble slide-in reveals */
.message-left.reveal {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.message-left.reveal.active {
  opacity: 1;
  transform: translateX(0);
}

.message-right.reveal {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.message-right.reveal.active {
  opacity: 1;
  transform: translateX(0);
}

.chat-input-area {
  display: flex;
  align-items: center;
  padding: 12px 18px;
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  gap: 12px;
}

.chat-input-field {
  flex-grow: 1;
  border: none;
  background: #f2f4f6;
  padding: 10px 16px;
  border-radius: 20px;
  font-size: 13.5px;
  color: var(--color-text-muted);
  outline: none;
  font-family: var(--font-sans);
  pointer-events: none;
}

.chat-send-btn {
  background-color: var(--color-primary);
  color: var(--color-white);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
  flex-shrink: 0;
}

.chat-send-btn:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-white);
}

/* ==========================================================================
   Jekyll Blog & Article Styles (iOS/Apple Aesthetic)
   ========================================================================== */
body.blog-layout {
  background-color: var(--color-white);
}

body.blog-layout .site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

body.blog-layout .site-content {
  flex: 1;
  padding-top: calc(var(--header-height) + 32px); /* Spacing to prevent overlay under fixed header */
}

body.blog-layout .main-header {
  background-color: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

/* Blog Header Section (Toss Tech Style) */
.blog-header-section {
  padding: 40px 0 16px;
  margin-bottom: 32px;
}

.blog-main-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text-main);
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.blog-main-subtitle {
  font-size: 16px;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: -0.01em;
}

/* Toss Tech-inspired Flat List Layout */
.blog-posts-list {
  display: flex;
  flex-direction: column;
  margin-bottom: 80px;
  padding-top: 40px; /* Offset spacing from navigation header */
}

.blog-post-item {
  padding: 32px 0;
}

.blog-post-item:first-child {
  padding-top: 10px;
}

.blog-post-item:last-child {
  border-bottom: none;
}

.blog-item-link {
  display: block;
  color: inherit;
}

.blog-item-link:hover {
  color: inherit;
}

.blog-item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
}

.blog-item-left {
  flex: 1;
  min-width: 0;
}

.blog-item-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.blog-item-category {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  letter-spacing: 0.3px;
  transition: background-color 0.2s ease, color 0.2s ease;
  line-height: 1;
}

.blog-item-category.tag-frontend {
  background-color: rgba(49, 130, 246, 0.08);
  color: #1a70e6;
}

.blog-item-category.tag-backend {
  background-color: rgba(2, 184, 117, 0.08);
  color: #1aa064;
}

.blog-item-category.tag-etc {
  background-color: rgba(139, 92, 246, 0.08);
  color: #7c3aed;
}

.blog-item-link:hover .blog-item-category.tag-frontend {
  background-color: rgba(49, 130, 246, 0.14);
}

.blog-item-link:hover .blog-item-category.tag-backend {
  background-color: rgba(2, 184, 117, 0.14);
}

.blog-item-link:hover .blog-item-category.tag-etc {
  background-color: rgba(139, 92, 246, 0.14);
}

.blog-item-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 10px;
  line-height: 1.35;
  letter-spacing: -0.6px;
  transition: color 0.2s ease;
}

.blog-item-link:hover .blog-item-title {
  color: var(--color-primary);
}

.blog-item-excerpt {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-item-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  gap: 16px;
}

.blog-item-right {
  flex-shrink: 0;
  overflow: hidden; /* Mask dynamic image scaling */
  border-radius: 12px;
}

.blog-item-thumbnail {
  width: 200px;
  height: 125px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.04);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
  display: block;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
}

.blog-item-link:hover .blog-item-thumbnail {
  transform: scale(1.06); /* Scale inner image on hover over list item */
}

.blog-no-posts {
  font-size: 15px;
  color: var(--color-text-muted);
  text-align: center;
  padding: 40px 0;
}

/* Blog Detail / Post View Styles (Flat Toss Vibe) */
.blog-detail-back-container {
  padding: 40px 0 20px;
}

.blog-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.blog-back-link:hover {
  color: var(--color-primary);
}

.blog-article {
  background-color: transparent;
  padding: 30px 0 80px;
  margin-bottom: 0;
  box-shadow: none;
  border-radius: 0;
}

.blog-article-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 32px;
  margin-bottom: 40px;
}

.blog-article-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.blog-article-category {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  letter-spacing: 0.3px;
  line-height: 1;
}

.blog-article-category.tag-frontend {
  background-color: rgba(49, 130, 246, 0.08);
  color: #1a70e6;
}

.blog-article-category.tag-backend {
  background-color: rgba(2, 184, 117, 0.08);
  color: #1aa064;
}

.blog-article-category.tag-etc {
  background-color: rgba(139, 92, 246, 0.08);
  color: #7c3aed;
}

.blog-article-title {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -1.2px;
  margin-bottom: 20px;
  color: var(--color-text-main);
}

.blog-article-meta {
  font-size: 13.5px;
  color: var(--color-text-muted);
  display: flex;
  gap: 20px;
}

.blog-article-content p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--color-text-body);
  margin-bottom: 24px;
}

.blog-article-content hr {
  display: none; /* Hide horizontal rules completely */
}

.blog-article-content h2 {
  font-size: 22px;
  font-weight: 700;
  margin-top: 48px;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  color: var(--color-text-main);
}

.blog-article-content ul {
  list-style: disc;
  margin-left: 20px;
  margin-bottom: 24px;
}

.blog-article-content li {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 8px;
  color: var(--color-text-body);
}

.blog-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 40px 0;
}

/* responsive table */
.table-responsive {
  overflow-x: auto;
  margin: 32px 0;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.blog-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
  min-width: 600px;
}

.blog-table th {
  background-color: #f5f5f7;
  font-weight: 600;
  color: var(--color-text-main);
  padding: 14px 18px;
  border-bottom: 1.5px solid var(--color-border);
}

.blog-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-body);
  line-height: 1.6;
}

.blog-table tr:last-child td {
  border-bottom: none;
}

.blog-table tr:hover {
  background-color: #fbfbfd;
}

/* Custom Diagram & Callout */
.blog-callout-placeholder {
  background-color: #f5f5f7;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 28px;
  margin: 36px 0;
}

.blog-callout-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-main);
  margin-bottom: 20px;
}

.callout-icon {
  color: var(--color-primary);
}

.blog-callout-body {
  font-size: 14px;
  color: var(--color-text-body);
}

.sleek-diagram-container {
  background: #ffffff;
  border-radius: 16px;
  border: 1px solid rgba(0, 0, 0, 0.04);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.01);
  padding: 24px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
  justify-content: center;
}

.diagram-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.flow-node {
  background: #f5f5f7;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 18px;
  text-align: center;
  min-width: 130px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.01);
}

.flow-node .node-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-main);
}

.flow-node .node-subtitle {
  font-size: 11px;
  color: var(--color-text-muted);
}

.flow-node.highlight-error {
  border-color: #ff3b30;
  background: rgba(255, 59, 48, 0.02);
}

.flow-node.highlight-error .node-title {
  color: #ff3b30;
}

.flow-node.websocket-node {
  border-color: var(--color-primary);
  background: rgba(0, 122, 255, 0.02);
}

.flow-node.websocket-node .node-title {
  color: var(--color-primary);
}

.flow-arrow {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  user-select: none;
}

.flow-arrow-accent {
  color: #ff3b30;
}

.flow-arrow-success {
  color: #34c759;
}

.diagram-caption {
  font-size: 11.5px;
  color: var(--color-text-muted);
  opacity: 0.8;
  text-align: center;
  margin-top: 8px;
  margin-bottom: 28px !important;
}

/* Mobile Responsive Blog Styles */
@media (max-width: 768px) {
  body.blog-layout .site-content {
    padding-top: calc(var(--header-height) + 20px) !important;
  }

  .blog-header-section {
    padding: 32px 0 16px;
    margin-bottom: 20px;
  }

  .blog-detail-back-container {
    padding: 24px 0 12px;
  }

  .blog-main-title {
    font-size: 28px;
  }

  .blog-main-subtitle {
    font-size: 14px;
  }

  .blog-posts-list {
    margin-bottom: 40px;
  }

  .blog-post-item {
    padding: 24px 0;
  }

  .blog-item-left {
    width: 100%;
  }

  .blog-item-content {
    flex-direction: column-reverse;
    align-items: stretch;
    gap: 16px;
  }

  .blog-item-thumbnail {
    width: 100%;
    height: 160px;
  }

  .blog-item-title {
    font-size: 18px;
    margin-bottom: 6px;
  }

  .blog-item-excerpt {
    font-size: 13.5px;
    margin-bottom: 12px;
  }

  .blog-article {
    padding: 10px 0 40px;
    margin-bottom: 0;
  }

  .blog-article-header {
    padding-bottom: 18px;
    margin-bottom: 24px;
  }

  .blog-article-title {
    font-size: 22px;
    margin-bottom: 12px;
  }

  .blog-article-meta {
    font-size: 12px;
    gap: 12px;
  }

  .blog-article-content p {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 18px;
  }

  .blog-article-content h2 {
    font-size: 17px;
    margin-top: 32px;
    margin-bottom: 12px;
  }

  /* Rotate diagram arrows for mobile screens */
  .diagram-flow {
    flex-direction: column;
    gap: 8px;
  }

  .flow-arrow {
    transform: rotate(90deg);
    margin: 4px 0;
  }

  /* Responsive structured footer styles */
  .main-footer {
    padding: 40px 0 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-container {
    gap: 32px;
  }
  .footer-intro-text {
    max-width: 100%;
  }
}

/* --- Kramdown Markdown Table Layout Fixes --- */
.blog-article-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  text-align: left;
  margin: 32px 0;
  border-radius: 14px;
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.blog-article-content th {
  background-color: #f5f5f7;
  font-weight: 600;
  color: var(--color-text-main);
  padding: 14px 18px;
  border-bottom: 1.5px solid var(--color-border);
  font-size: 14px;
}

.blog-article-content td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-body);
  line-height: 1.6;
}

.blog-article-content tr:last-child td {
  border-bottom: none;
}

.blog-article-content tr:hover {
  background-color: #fbfbfd;
}

@media (max-width: 768px) {
  .blog-article-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* --- Reusable Glossary Popup System (Toss Glassmorphism) --- */
.glossary-term {
  border-bottom: 1px dashed var(--color-primary);
  color: var(--color-text-main);
  cursor: help;
  font-weight: 600;
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  border-radius: 4px;
  padding-left: 2px;
  padding-right: 2px;
}

.glossary-term:hover {
  color: var(--color-primary);
  border-bottom-color: transparent;
  background-color: rgba(49, 130, 246, 0.08);
}

.glossary-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  z-index: 2000;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.glossary-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.glossary-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.glossary-modal-content {
  position: relative;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 24px;
  padding: 28px;
  width: 440px;
  max-width: 90%;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
  transform: scale(0.94);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 2001;
}

.glossary-modal.active .glossary-modal-content {
  transform: scale(1);
}

.glossary-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding-bottom: 12px;
}

.glossary-modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-main);
  margin: 0;
}

.glossary-modal-close {
  background: none;
  border: none;
  font-size: 28px;
  font-weight: 300;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.2s ease, transform 0.2s ease;
}

.glossary-modal-close:hover {
  color: var(--color-text-main);
  transform: scale(1.1);
}

.glossary-modal-body {
  line-height: 1.6;
}

.glossary-modal-description {
  font-size: 15px;
  color: var(--color-text-body);
  margin: 0;
  line-height: 1.68;
}

/* --- Code Block and Inline Code Styles --- */
.blog-article-content pre {
  background-color: #f5f5f7;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 20px;
  overflow-x: auto;
  margin: 28px 0;
}

.blog-article-content pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  border: none;
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13.5px;
  color: var(--color-text-main);
  line-height: 1.68;
  display: block;
}

.blog-article-content code {
  background-color: #f5f5f7;
  color: #ff2d55; /* soft red-pink accent color for inline code */
  padding: 3px 6px;
  border-radius: 6px;
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

/* --- base16.monokai.dark Syntax Highlighting --- */
.blog-article-content pre.highlight,
.blog-article-content .highlight pre {
  background-color: #272822;
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.blog-article-content pre.highlight code,
.blog-article-content .highlight pre code {
  color: #f8f8f2;
}

.highlight table td { padding: 5px; }
.highlight table pre { margin: 0; }
.highlight, .highlight .w {
  color: #f8f8f2;
  background-color: #272822;
}
.highlight .err {
  color: inherit;
  background-color: transparent;
}
.highlight .c, .highlight .ch, .highlight .cd, .highlight .cm, .highlight .cpf, .highlight .c1, .highlight .cs {
  color: #75715e;
}
.highlight .cp {
  color: #f4bf75;
}
.highlight .nt {
  color: #f4bf75;
}
.highlight .o, .highlight .ow {
  color: #f8f8f2;
}
.highlight .p, .highlight .pi {
  color: #f8f8f2;
}
.highlight .gi {
  color: #a6e22e;
}
.highlight .gd {
  color: #f92672;
}
.highlight .gh {
  color: #66d9ef;
  background-color: #272822;
  font-weight: bold;
}
.highlight .k, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kv {
  color: #ae81ff;
}
.highlight .kc {
  color: #fd971f;
}
.highlight .kt {
  color: #fd971f;
}
.highlight .kd {
  color: #fd971f;
}
.highlight .s, .highlight .sb, .highlight .sc, .highlight .dl, .highlight .sd, .highlight .s2, .highlight .sh, .highlight .sx, .highlight .s1 {
  color: #a6e22e;
}
.highlight .sa {
  color: #ae81ff;
}
.highlight .sr {
  color: #a1efe4;
}
.highlight .si {
  color: #cc6633;
}
.highlight .se {
  color: #cc6633;
}
.highlight .nn {
  color: #f4bf75;
}
.highlight .nc {
  color: #f4bf75;
}
.highlight .no {
  color: #f4bf75;
}
.highlight .na {
  color: #66d9ef;
}
.highlight .m, .highlight .mb, .highlight .mf, .highlight .mh, .highlight .mi, .highlight .il, .highlight .mo, .highlight .mx {
  color: #a6e22e;
}
.highlight .ss {
  color: #a6e22e;
}

/* --- Mermaid Diagram Alignment --- */
.mermaid {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 32px 0;
  width: 100%;
}

/* ==========================================================================
   Skills Section (Custom styling consistent with Toss layout)
   ========================================================================== */
.skills-section {
  background-color: var(--color-bg-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skills-card {
  background-color: var(--color-white);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.02), 0 1px 2px rgba(0, 0, 0, 0.01);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.skills-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.02);
}

.skills-category-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}