/* ============================================
   GTK4 Adwaita × Morandi Academic Theme
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Morandi Palette - Light */
  --bg-primary: #f3eeea;
  --bg-secondary: #ebe5df;
  --bg-card: #ffffff;
  --bg-card-hover: #faf8f6;
  --bg-headerbar: rgba(243, 238, 234, 0.85);
  --bg-sidebar: #e8e2dc;

  --text-primary: #3a3632;
  --text-secondary: #6e6862;
  --text-tertiary: #9a948e;
  --text-link: #7b8b7a;
  --text-link-hover: #5c6e5b;

  --accent: #8b9d83;
  --accent-hover: #7a8e72;
  --accent-subtle: rgba(139, 157, 131, 0.12);
  --accent-border: rgba(139, 157, 131, 0.3);

  --morandi-rose: #c4a7a0;
  --morandi-blue: #8d9faa;
  --morandi-green: #8b9d83;
  --morandi-taupe: #b0a296;
  --morandi-lavender: #a29aaf;
  --morandi-sand: #c9bfb0;

  --border-color: rgba(58, 54, 50, 0.08);
  --border-strong: rgba(58, 54, 50, 0.15);
  --shadow-sm: 0 1px 3px rgba(58, 54, 50, 0.06);
  --shadow-md: 0 4px 12px rgba(58, 54, 50, 0.08);
  --shadow-lg: 0 8px 30px rgba(58, 54, 50, 0.1);
  --shadow-card: 0 1px 3px rgba(58, 54, 50, 0.04), 0 4px 14px rgba(58, 54, 50, 0.06);
  --shadow-card-hover: 0 4px 16px rgba(58, 54, 50, 0.1), 0 8px 30px rgba(58, 54, 50, 0.06);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --headerbar-height: 48px;

  /* Adwaita-style easing */
  --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1.0);
  --ease-in: cubic-bezier(0.4, 0.0, 1.0, 1.0);
  --ease-in-out: cubic-bezier(0.4, 0.0, 0.2, 1.0);
  --ease-overshoot: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --duration-enter: 500ms;
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #2a2724;
  --bg-secondary: #33302c;
  --bg-card: #3a3733;
  --bg-card-hover: #413e39;
  --bg-headerbar: rgba(42, 39, 36, 0.9);
  --bg-sidebar: #33302c;

  --text-primary: #e4dfd9;
  --text-secondary: #b0aaa3;
  --text-tertiary: #7f7972;
  --text-link: #a3b89e;
  --text-link-hover: #b8ccb3;

  --accent: #a3b89e;
  --accent-hover: #b8ccb3;
  --accent-subtle: rgba(163, 184, 158, 0.12);
  --accent-border: rgba(163, 184, 158, 0.25);

  --morandi-rose: #c4a7a0;
  --morandi-blue: #8d9faa;
  --morandi-green: #a3b89e;
  --morandi-taupe: #b0a296;
  --morandi-lavender: #a29aaf;
  --morandi-sand: #c9bfb0;

  --border-color: rgba(228, 223, 217, 0.08);
  --border-strong: rgba(228, 223, 217, 0.15);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.25);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.1), 0 4px 14px rgba(0, 0, 0, 0.12);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.2), 0 8px 30px rgba(0, 0, 0, 0.15);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', 'Cantarell', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--duration-slow) var(--ease-in-out),
              color var(--duration-slow) var(--ease-in-out);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--text-link-hover);
}

::selection {
  background: var(--accent-subtle);
  color: var(--text-primary);
}

/* --- HeaderBar (GTK4 style) --- */
.headerbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--headerbar-height);
  background: var(--bg-headerbar);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  transition: background-color var(--duration-slow) var(--ease-in-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.headerbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.headerbar-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.headerbar-title a {
  color: inherit;
}

.headerbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.headerbar-nav a,
.headerbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.headerbar-nav a:hover,
.headerbar-btn:hover {
  background: var(--accent-subtle);
  color: var(--text-primary);
}

.headerbar-nav a.active {
  background: var(--accent-subtle);
  color: var(--accent);
}

.theme-toggle {
  width: 34px;
  height: 34px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 16px;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  transition: transform var(--duration-normal) var(--ease-spring);
}

.theme-toggle:hover svg {
  transform: rotate(30deg);
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--duration-normal) var(--ease-out);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Main Layout --- */
.main-content {
  max-width: 860px;
  margin: 0 auto;
  padding: calc(var(--headerbar-height) + 40px) 24px 60px;
}

/* --- Hero / About Section --- */
.hero {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  margin-bottom: 50px;
}

.hero-avatar {
  flex-shrink: 0;
}

.hero-avatar img {
  width: 160px;
  height: 210px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  object-position: center 20%;
  box-shadow: var(--shadow-md);
  transition: transform var(--duration-slow) var(--ease-overshoot),
              box-shadow var(--duration-normal) var(--ease-out);
}

.hero-avatar img:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-lg);
}

.hero-info h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.hero-info .subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.hero-info .bio {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-normal) var(--ease-out);
}

.hero-links a:hover {
  background: var(--accent-subtle);
  border-color: var(--accent-border);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.hero-links a svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
  flex-shrink: 0;
}

/* --- Section --- */
.section {
  margin-bottom: 44px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.section-header .section-line {
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

/* --- Adwaita Card Style --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-strong);
}

.card + .card {
  margin-top: 12px;
}

/* --- News Items --- */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.news-item {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) var(--ease-out);
}

.news-item:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateX(4px);
}

.news-date {
  flex-shrink: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--morandi-blue);
  font-variant-numeric: tabular-nums;
  min-width: 80px;
}

.news-text {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.news-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* --- Publications --- */
.pub-item {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) var(--ease-out);
}

.pub-thumb {
  width: 160px;
  max-width: 160px;
  height: auto;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  object-fit: contain;
  border: 1px solid var(--border-color);
}

.pub-body {
  flex: 1;
  min-width: 0;
}

.pub-item:hover {
  box-shadow: var(--shadow-card-hover);
}

.pub-item + .pub-item {
  margin-top: 12px;
}

.pub-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.5;
}

.pub-authors {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  line-height: 1.5;
}

.pub-authors .me {
  color: var(--accent);
  font-weight: 600;
}

.pub-venue {
  font-size: 13px;
  color: var(--text-tertiary);
  font-style: italic;
  margin-bottom: 10px;
}

.pub-thumb-link {
  display: block;
}

.pub-title a {
  color: inherit;
  text-decoration: none;
}

.pub-title a:hover {
  color: var(--accent);
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pub-links a,
.pub-tag,
.pub-award {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 42px;
  padding: 0 20px;
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  transition: all var(--duration-fast) var(--ease-out);
  box-sizing: border-box;
}

.pub-links a {
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid transparent;
}

.pub-links a:hover {
  border-color: var(--accent-border);
  background: var(--accent);
  color: var(--bg-card);
}

.pub-tag {
  border: 1px solid transparent;
}

.pub-tag-accepted {
  background: rgba(100, 196, 136, 0.2);
  color: #8fe0aa;
  border-color: rgba(100, 196, 136, 0.34);
}

.pub-tag-review {
  background: rgba(141, 159, 170, 0.1);
  color: var(--morandi-blue);
  border-color: rgba(141, 159, 170, 0.14);
}

.pub-award {
  background: linear-gradient(135deg, #b7791f 0%, #f6d365 100%);
  color: #3b2200;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 18px rgba(183, 121, 31, 0.22);
}

/* --- Education / Experience --- */
.timeline-item {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) var(--ease-out);
}

.timeline-item:hover {
  box-shadow: var(--shadow-card-hover);
}

.timeline-item + .timeline-item {
  margin-top: 10px;
}

.timeline-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.timeline-content h3 {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.timeline-content .timeline-sub {
  font-size: 13px;
  color: var(--text-secondary);
}

.timeline-content .timeline-date {
  font-size: 12.5px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* --- Footer --- */
.site-footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 30px 24px 40px;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.site-footer p {
  font-size: 13px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* --- Scroll Animations --- */
.anim-fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-enter) var(--ease-out),
              transform var(--duration-enter) var(--ease-out);
}

.anim-fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.anim-fade-left {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity var(--duration-enter) var(--ease-out),
              transform var(--duration-enter) var(--ease-out);
}

.anim-fade-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.anim-fade-right {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity var(--duration-enter) var(--ease-out),
              transform var(--duration-enter) var(--ease-out);
}

.anim-fade-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.anim-scale-in {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--duration-enter) var(--ease-out),
              transform var(--duration-enter) var(--ease-overshoot);
}

.anim-scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger children */
.stagger-children > *:nth-child(1) { transition-delay: 0ms; }
.stagger-children > *:nth-child(2) { transition-delay: 60ms; }
.stagger-children > *:nth-child(3) { transition-delay: 120ms; }
.stagger-children > *:nth-child(4) { transition-delay: 180ms; }
.stagger-children > *:nth-child(5) { transition-delay: 240ms; }
.stagger-children > *:nth-child(6) { transition-delay: 300ms; }
.stagger-children > *:nth-child(7) { transition-delay: 360ms; }
.stagger-children > *:nth-child(8) { transition-delay: 420ms; }

/* --- Mobile Nav Overlay --- */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--headerbar-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 999;
  padding: 20px;
  flex-direction: column;
  gap: 4px;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.mobile-nav.open {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.mobile-nav a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  transition: background var(--duration-fast) var(--ease-out);
}

.mobile-nav a:hover,
.mobile-nav a.active {
  background: var(--accent-subtle);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
  }

  .hero-avatar img {
    width: 130px;
    height: 130px;
  }

  .hero-info h1 {
    font-size: 24px;
  }

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

  .main-content {
    padding-top: calc(var(--headerbar-height) + 28px);
    padding-left: 16px;
    padding-right: 16px;
  }

  .headerbar-nav .nav-links {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .news-item {
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px;
  }

  .news-date {
    min-width: unset;
  }

  .timeline-item {
    padding: 14px 16px;
  }

  .pub-item {
    padding: 16px;
  }

  .pub-thumb {
    width: 100px;
    max-width: 100px;
  }

  .site-footer {
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (max-width: 480px) {
  .hero-avatar img {
    width: 110px;
    height: 110px;
  }

  .hero-info h1 {
    font-size: 22px;
  }

  .section-header h2 {
    font-size: 16px;
  }
}

/* --- Print --- */
@media print {
  .headerbar, .theme-toggle, .menu-toggle, .mobile-nav {
    display: none !important;
  }
  .main-content {
    padding-top: 0;
  }
  .card, .news-item, .pub-item, .timeline-item {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}