@import url('https://fonts.googleapis.com/css2?family=Dancing+Script:wght@600&display=swap');

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

:root {
  --bg: #e8f3fb;
  --text: #1a1a1a;
  --muted: #888;
  --accent: #3a5ccc;
  --border: #e4e4e0;
  --max-width: 680px;
  --font: 'Georgia', serif;
  --font-mono: 'Menlo', 'Monaco', 'Consolas', monospace;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
}

body {
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ── Layout ── */
header, main, footer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Header ── */
header {
  padding-top: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

#sphere-canvas {
  display: block;
  width: 88px;
  height: 88px;
  flex-shrink: 0;
  opacity: 0.9;
}

.name-svg {
  display: block;
  height: 2rem;
  width: auto;
  overflow: visible;
  animation: name-sweep 6s cubic-bezier(0.22, 1, 0.36, 1) 0.6s both;
}
@keyframes name-sweep {
  from { clip-path: inset(-20% 102% -20% 0); }
  to   { clip-path: inset(-20%  -2% -20% 0); }
}
.name-text {
  font-family: 'Dancing Script', cursive;
  font-size: 42px;
  font-weight: 600;
  fill: currentColor;
}

.identity .tagline {
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin-top: 0.15rem;
}

nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}

nav a:hover,
nav a.active {
  color: var(--text);
  text-decoration: none;
}

/* active underline handled by .nav-indicator */

/* ── Main Content ── */
main {
  flex: 1;
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

section {
  margin-bottom: 3rem;
}

.intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.intro-text p {
  font-size: 1rem;
  color: #444;
}

.avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: #e0dedd;
  flex-shrink: 0;
  overflow: hidden;
  /* Replace background with: <img src="photo.jpg" alt="Alex Li" /> */
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

h2 {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 1.2rem;
  font-weight: normal;
}

/* ── Entries (Experience / Projects / Research / Hobbies) ── */
.entries {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.entry-title {
  font-size: 0.95rem;
  font-weight: 500;
}

.entry-date {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.entry-link {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  white-space: nowrap;
  color: var(--accent, currentColor);
  text-decoration: none;
}

.entry-link:hover {
  text-decoration: underline;
}

.entry-sub {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.entry-award {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--muted);
  opacity: 0.7;
  letter-spacing: 0.02em;
}

.entry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.45rem;
}

.entry-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: #aaa;
  background: var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.45rem;
  letter-spacing: 0.02em;
}

[data-theme="dark"] .entry-tag {
  color: #4a6a88;
  background: #162840;
}

.hobbies-list .entry-title {
  font-size: 0.95rem;
}

/* ── Fan Controls ── */
.fan-controls {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.fan-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.15s;
}

.fan-btn i {
  font-size: 0.6rem;
  transition: transform 0.3s ease;
}

.fan-btn:hover {
  color: var(--text);
  border-color: var(--text);
  transform: translateY(-1px);
}

.fan-btn#play-all-btn.active {
  color: #fff;
  background: #1DB954;
  border-color: #1DB954;
}

.fan-btn#shuffle-btn.active i {
  transform: rotate(180deg);
}

.fan-btn#play-all-btn.active i {
  animation: pulse-play 0.9s ease infinite;
}

@keyframes pulse-play {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ── Song Cards ── */
.fan-rack {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-top: 50px;
}

.song-card {
  width: 150px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
  border: 1px solid var(--border);
  position: relative;
  transform-origin: bottom center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.fan-rack .song-card + .song-card {
  margin-left: -60px;
}

.fan-rack .song-card:nth-child(1) { transform: rotate(-18deg); z-index: 1; }
.fan-rack .song-card:nth-child(2) { transform: rotate(-12deg); z-index: 2; }
.fan-rack .song-card:nth-child(3) { transform: rotate(-6deg);  z-index: 3; }
.fan-rack .song-card:nth-child(4) { transform: rotate(0deg);   z-index: 4; }
.fan-rack .song-card:nth-child(5) { transform: rotate(6deg);   z-index: 5; }
.fan-rack .song-card:nth-child(6) { transform: rotate(12deg);  z-index: 6; }
.fan-rack .song-card:nth-child(7) { transform: rotate(18deg);  z-index: 7; }

.fan-rack .song-card:hover {
  transform: rotate(0deg) translateY(-14px) !important;
  z-index: 10;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.15);
}

.song-art {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  background: var(--border);
  overflow: hidden;
}

.art-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.art-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  transition: background 0.2s ease;
}

.song-card:hover .art-overlay {
  background: rgba(0, 0, 0, 0.35);
}

.play-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #1DB954;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.15s ease;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

.song-card:hover .play-btn,
.play-btn.playing {
  opacity: 1;
  transform: scale(1);
}

.play-btn:hover {
  background: #1ed760;
  transform: scale(1.08) !important;
}

.play-btn svg {
  width: 18px;
  height: 18px;
  fill: white;
}

.icon-play { margin-left: 2px; }
.icon-pause { display: none; }
.play-btn.playing .icon-play { display: none; }
.play-btn.playing .icon-pause { display: block; }

.song-info {
  padding: 0.6rem 0.7rem 0.7rem;
}

.song-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 0.15rem 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-artist {
  font-size: 0.7rem;
  color: var(--muted);
  margin: 0;
}

/* ── Waveform ── */
.waveform {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 3px;
  align-items: flex-end;
  height: 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 5;
}

.waveform span {
  display: block;
  width: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.92);
  transform-origin: bottom;
  animation: waveBar 0.9s ease-in-out infinite;
  animation-play-state: paused;
}

.waveform span:nth-child(1) { height: 8px;  animation-delay: 0s; }
.waveform span:nth-child(2) { height: 13px; animation-delay: 0.15s; }
.waveform span:nth-child(3) { height: 20px; animation-delay: 0.3s; }
.waveform span:nth-child(4) { height: 13px; animation-delay: 0.15s; }
.waveform span:nth-child(5) { height: 8px;  animation-delay: 0s; }

@keyframes waveBar {
  0%, 100% { transform: scaleY(0.25); }
  50%       { transform: scaleY(1); }
}

.song-art:has(.play-btn.playing) .waveform {
  opacity: 1;
}

.song-art:has(.play-btn.playing) .waveform span {
  animation-play-state: running;
}

@keyframes cardGlow {
  0%, 100% { box-shadow: 0 0 0 1px rgba(29,185,84,0.1), 0 4px 12px rgba(29,185,84,0.05); }
  50%       { box-shadow: 0 0 0 1.5px rgba(29,185,84,0.35), 0 4px 18px rgba(29,185,84,0.12); }
}

.fan-rack .song-card:has(.play-btn.playing) {
  animation: cardGlow 0.9s ease-in-out infinite;
  z-index: 10;
}

.yt-hidden {
  position: fixed;
  left: -9999px;
  top: -9999px;
  width: 320px;
  height: 180px;
  pointer-events: none;
}

/* ── Photography Grid ── */
.photo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.photo-placeholder {
  aspect-ratio: 4 / 3;
  background: #ebebea;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-align: center;
  padding: 1rem;
}

.photo-caption {
  font-size: 0.75rem;
  color: #aaa;
}

/* ── Footer ── */
footer {
  padding-top: 1.5rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

footer p {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

footer a {
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  font-size: 1.25rem;
  transition: color 0.15s, transform 0.2s ease;
}

footer a:hover {
  color: var(--text);
  text-decoration: none;
  transform: translateY(-3px);
}

footer a[aria-label="Email"]:hover    { color: #e04040; }
footer a[aria-label="GitHub"]:hover   { color: #24292f; }
footer a[aria-label="LinkedIn"]:hover { color: #0077b5; }

[data-theme="dark"] footer a[aria-label="GitHub"]:hover { color: #f0f0f0; }

/* ── Responsive ── */
@media (max-width: 480px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  #sphere-canvas {
    width: 64px;
    height: 64px;
  }

  .intro {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 1.2rem;
  }

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

  .photo-grid {
    grid-template-columns: 1fr;
  }

  .entry-header {
    flex-direction: column;
    gap: 0.1rem;
  }
}

/* ── Name breathing (applied via JS after draw completes) ── */
@keyframes name-breathe {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.78; }
}

/* ── Grain texture ── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.038;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.78' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px 180px;
}

/* ── Vignette ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9997;
  background: radial-gradient(ellipse at 50% 38%, transparent 52%, rgba(8, 20, 44, 0.18) 100%);
}

/* ── Scroll reveal ── */
.js-reveal section {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.js-reveal section.visible {
  opacity: 1;
  transform: none;
}

/* ── Theme toggle button ── */
#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  color: var(--muted);
  padding: 0;
  line-height: 1;
  transition: color 0.15s;
  flex-shrink: 0;
}
#theme-toggle:hover {
  color: var(--text);
}

/* ── Dark mode ── */
[data-theme="dark"] {
  --bg: #0d1b2e;
  --text: #d4e8f5;
  --muted: #5d82a0;
  --accent: #7bb5e0;
  --border: #1e3450;
}
/* ── Avatar entrance ── */
@keyframes avatarIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.avatar {
  animation: avatarIn 0.55s ease 0.15s both;
}

/* ── Dark mode overrides ── */
[data-theme="dark"] .intro-text p {
  color: #ffffff;
}

[data-theme="dark"] .avatar {
  background: #1a2e48;
}
[data-theme="dark"] .photo-placeholder {
  background: #162538;
}
[data-theme="dark"] body::before {
  background: radial-gradient(ellipse at 50% 38%, transparent 52%, rgba(0, 5, 15, 0.35) 100%);
}

/* ── Sliding nav indicator ── */
nav {
  position: relative;
}
.nav-indicator {
  position: absolute;
  bottom: -3px;
  height: 1px;
  background: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: left 0.22s ease, width 0.22s ease, opacity 0.15s;
}

/* ── Entry hover shift ── */
.entries li {
  transition: transform 0.2s ease;
}
.entries li:hover {
  transform: translateX(5px);
}