/* ============================================================
   ZIHAN YAN — PIXEL ART PERSONAL WEBSITE
   ============================================================ */

/* ── VARIABLES ───────────────────────────────────────────── */
:root {
  --bg:        #07070f;
  --bg-mid:    #0d0d24;
  --bg-card:   #0f0f1e;
  --border:    #1e1e3f;
  --cyan:      #00e5ff;
  --purple:    #b44fff;
  --amber:     #ffb300;
  --green:     #00ff88;
  --pink:      #ff44aa;
  --red:       #ff4444;
  --white:     #e0e0ff;
  --dim:       #5555aa;
  --pixel:     'Press Start 2P', monospace;
  --mono:      'Share Tech Mono', monospace;
  --vt:        'VT323', monospace;
  --glow-c:    0 0 8px var(--cyan), 0 0 20px rgba(0,229,255,.25);
  --glow-p:    0 0 8px var(--purple), 0 0 20px rgba(180,79,255,.25);
  --glow-a:    0 0 8px var(--amber), 0 0 20px rgba(255,179,0,.25);
}

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

html {
  scroll-behavior: smooth;
  /* 根字号 +2px（相对常见 16px），全站 rem 随之放大 */
  font-size: 112.5%;
}

body {
  background: var(--bg);
  color: var(--white);
  font-family: var(--mono);
  /* 正文默认 +2px（相对原先 14px） */
  font-size: 16px;
  overflow-x: hidden;
  cursor: crosshair;
}

/* ── SCANLINES ───────────────────────────────────────────── */
.scanlines {
  pointer-events: none;
  position: fixed; inset: 0; z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,.12) 2px,
    rgba(0,0,0,.12) 4px
  );
  animation: scanMove 8s linear infinite;
}
@keyframes scanMove {
  from { background-position: 0 0; }
  to   { background-position: 0 100px; }
}

/* ── PIXEL BOX (reusable border) ─────────────────────────── */
.pixel-box {
  border: 2px solid var(--border);
  background: var(--bg-card);
  position: relative;
  image-rendering: pixelated;
}
.pixel-box::before {
  content: '';
  position: absolute; inset: -1px;
  border: 1px solid rgba(0,229,255,.08);
  pointer-events: none;
}

/* ── TYPOGRAPHY ──────────────────────────────────────────── */
.press-start { font-family: var(--pixel); line-height: 1.8; letter-spacing: .05em; }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-shadow: var(--glow-c); }

/* ── NAVIGATION ──────────────────────────────────────────── */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  height: 52px;
  background: rgba(7,7,15,.9);
  border-bottom: 2px solid var(--border);
  backdrop-filter: blur(8px);
}
.nav-logo {
  display: flex; align-items: center; gap: .6rem;
  font-size: .6rem;
  color: var(--cyan);
  text-shadow: var(--glow-c);
}
.nav-cat { font-size: 1.2rem; animation: catBob 2s ease-in-out infinite; }
@keyframes catBob {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-3px); }
}
.nav-links {
  display: flex; gap: 1.5rem; list-style: none;
}
.nav-links a {
  font-family: var(--pixel); font-size: .45rem;
  color: var(--dim);
  transition: color .2s, text-shadow .2s;
  padding: .3rem .5rem;
}
.nav-links a:hover {
  color: var(--cyan);
  text-shadow: var(--glow-c);
}
.entropy-counter {
  font-family: var(--pixel); font-size: .45rem;
  color: var(--amber);
  text-shadow: var(--glow-a);
}
.entropy-unit sub { font-size: .6em; }

/* Mobile nav toggle + panel — inactive on desktop via display:none */
.nav-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 .5rem;
  background: transparent;
  border: 2px solid var(--border);
  color: var(--cyan);
  font-family: var(--pixel);
  font-size: .55rem;
  line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  transition: border-color .2s, box-shadow .2s;
}
.nav-menu-toggle:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(0,229,255,.2);
}
.nav-menu-toggle__icon {
  display: block;
  transform: translateY(-1px);
}
.nav-mobile-panel {
  display: none;
}
.nav-links-mobile {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ── HERO ────────────────────────────────────────────────── */
#hero {
  position: relative;
  height: 100vh;
  height: 100dvh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
#starfield {
  position: absolute; inset: 0; width: 100%; height: 100%;
}
.hero-content {
  position: relative; z-index: 10;
  text-align: center;
  padding: 1rem;
}
.glitch-wrap { position: relative; display: inline-block; margin-bottom: 1.5rem; }
.glitch {
  font-size: clamp(1.2rem, 5vw, 2.5rem);
  color: var(--white);
  text-shadow: var(--glow-c);
  position: relative;
}
.glitch::before, .glitch::after {
  content: attr(data-text);
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
}
.glitch::before {
  color: var(--cyan);
  animation: glitch1 3s infinite;
  clip-path: polygon(0 30%, 100% 30%, 100% 50%, 0 50%);
}
.glitch::after {
  color: var(--purple);
  animation: glitch2 3s infinite;
  clip-path: polygon(0 60%, 100% 60%, 100% 80%, 0 80%);
}
@keyframes glitch1 {
  0%,90%,100% { transform: translate(0); opacity: 0; }
  92%          { transform: translate(-3px, 1px); opacity: .8; }
  96%          { transform: translate(3px, -1px); opacity: .8; }
}
@keyframes glitch2 {
  0%,88%,100% { transform: translate(0); opacity: 0; }
  90%          { transform: translate(3px, 2px); opacity: .7; }
  94%          { transform: translate(-3px, -1px); opacity: .7; }
}
.hero-sub {
  font-size: 1rem;
  color: var(--cyan);
  min-height: 1.5em;
  margin-bottom: 1.5rem;
  font-family: var(--vt);
  font-size: 1.4rem;
  letter-spacing: .1em;
}
.type-cursor::after {
  content: '█';
  animation: blink .7s steps(1) infinite;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }
.blink { animation: blink .7s steps(1) infinite; }

.hero-tags {
  display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem;
  margin-bottom: 2rem;
}
.pixel-tag {
  font-family: var(--pixel); font-size: .4rem;
  padding: .4rem .7rem;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  background: rgba(0,229,255,.07);
  text-shadow: var(--glow-c);
  transition: background .2s;
}
.pixel-tag:hover { background: rgba(0,229,255,.18); }

.hero-buttons { display: flex; gap: 1rem; justify-content: center; margin-bottom: 2.5rem; }

/* ── PIXEL BUTTONS ───────────────────────────────────────── */
.pixel-btn {
  font-family: var(--pixel); font-size: .45rem;
  padding: .7rem 1.2rem;
  cursor: pointer;
  display: inline-block;
  transition: transform .1s, box-shadow .2s;
  text-align: center;
}
.pixel-btn:active { transform: translate(2px,2px); }
.pixel-btn--primary {
  background: var(--cyan);
  color: var(--bg);
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 var(--bg-mid);
  text-shadow: none;
}
.pixel-btn--primary:hover {
  background: #00fff5;
  box-shadow: 0 0 16px var(--cyan), 4px 4px 0 var(--bg-mid);
  color: var(--bg);
}
.pixel-btn--outline {
  background: transparent;
  color: var(--cyan);
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 var(--border);
}
.pixel-btn--outline:hover {
  background: rgba(0,229,255,.12);
  box-shadow: 0 0 12px var(--cyan), 4px 4px 0 var(--border);
}
.pixel-btn--small { font-size: .35rem; padding: .4rem .7rem; }

/* ── SCHRÖDINGER BOX ─────────────────────────────────────── */
.schrodinger {
  display: inline-block; cursor: pointer;
  border: 2px solid var(--amber);
  background: rgba(255,179,0,.06);
  padding: 1rem 1.5rem;
  position: relative;
  transition: box-shadow .3s;
}
.schrodinger:hover { box-shadow: 0 0 16px var(--amber); }
.schrod-label {
  font-size: .4rem; color: var(--amber);
  text-shadow: var(--glow-a);
  display: block; text-align: center; line-height: 2;
}
.schrod-hint { font-family: var(--vt); font-size: .9rem; color: var(--dim); display: block; text-align: center; }
.schrod-result {
  font-size: 2.5rem; text-align: center; padding-top: .5rem;
  animation: popIn .3s ease;
}
@keyframes popIn {
  from { transform: scale(0); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
.hidden { display: none; }

/* ── SCROLL HINT ─────────────────────────────────────────── */
.scroll-hint {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  text-align: center; z-index: 10;
}
.scroll-hint .press-start { font-size: .35rem; color: var(--dim); }
.arrow-down { color: var(--cyan); font-size: 1.2rem; animation: bounce 1.5s infinite; }
@keyframes bounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(6px); } }

/* ── SECTION BASE ────────────────────────────────────────── */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 2rem 4rem;
}
.section-header { margin-bottom: 3rem; }
.section-title {
  font-size: clamp(.6rem, 2vw, .9rem);
  color: var(--cyan);
  text-shadow: var(--glow-c);
  letter-spacing: .15em;
}
.title-bracket { color: var(--purple); }
.sub-title {
  font-size: .55rem;
  color: var(--purple);
  margin: 2.5rem 0 1rem;
  letter-spacing: .1em;
}

/* ── ABOUT ───────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
@media (max-width: 700px) { .about-grid { grid-template-columns: 1fr; } }

/* Terminal */
.terminal-box {
  border-radius: 0;
  border: 2px solid var(--border);
  overflow: hidden;
  background: #080812;
}
.terminal-bar {
  display: flex; align-items: center; gap: .5rem;
  background: #111128;
  padding: .5rem .8rem;
  border-bottom: 1px solid var(--border);
}
.t-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.t-dot.red    { background: #ff5f57; }
.t-dot.yellow { background: #ffbd2e; }
.t-dot.green  { background: #28ca42; }
.t-title { font-family: var(--mono); font-size: .75rem; color: var(--dim); margin-left: auto; }
.terminal-body { padding: 1rem; font-family: var(--mono); font-size: .85rem; line-height: 1.9; }
.t-line { word-break: break-word; }
.t-cmd  { color: var(--green); }
.t-output { color: var(--white); padding-left: .5rem; }
.t-hi     { color: var(--amber); }
.t-cyan   { color: var(--cyan); }
.t-purple { color: var(--purple); }
.t-amber  { color: var(--amber); }
.t-green  { color: var(--green); }
.t-link   { color: var(--cyan); text-decoration: underline; }

/* Portrait */
.about-right { display: flex; flex-direction: column; gap: 1.5rem; }
.pixel-portrait {
  display: flex; justify-content: center;
  align-items: center;
  border: 2px solid var(--border);
  background: var(--bg-card);
  padding: 1rem;
}
.portrait-photo {
  display: block;
  width: 200px;
  height: 220px;
  object-fit: cover;
  object-position: center 25%;
  border: 1px solid rgba(0, 229, 255, 0.28);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.12);
}

/* Stats */
.about-stats { padding: 1rem; }
.stat-row {
  display: flex; justify-content: space-between;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .8rem;
}
.stat-row:last-child { border-bottom: none; }
.stat-label { color: var(--dim); font-family: var(--pixel); font-size: .4rem; align-self: center; }
.stat-val   { color: var(--white); text-align: right; }
.stat-num   { color: var(--cyan); font-family: var(--pixel); font-size: .6rem; text-shadow: var(--glow-c); }

/* Education timeline */
.edu-timeline { display: flex; flex-direction: column; gap: 1rem; padding-left: 1rem; }
.edu-item {
  display: flex; gap: 1rem; align-items: flex-start;
  position: relative;
}
.edu-item::before {
  content: attr(data-year);
  font-family: var(--pixel); font-size: .35rem;
  color: var(--amber); text-shadow: var(--glow-a);
  min-width: 70px; text-align: right;
  padding-top: .6rem;
}
.edu-dot {
  width: 12px; height: 12px; flex-shrink: 0;
  background: var(--cyan);
  box-shadow: var(--glow-c);
  margin-top: .6rem;
  position: relative;
}
.edu-dot::after {
  content: '';
  position: absolute; top: 12px; left: 5px;
  width: 2px; height: 40px;
  background: linear-gradient(var(--border), transparent);
}
.edu-content { padding: .6rem 1rem; flex: 1; }
.edu-degree { color: var(--cyan); font-size: .85rem; margin-bottom: .2rem; }
.edu-school { color: var(--white); font-size: .8rem; }
.edu-note   { color: var(--amber); font-size: .75rem; margin-top: .2rem; }

/* ── RESEARCH ────────────────────────────────────────────── */
.research-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 800px) {
  .research-layout { grid-template-columns: 1fr; }
  .blackhole-container { width: 100%; }
}

.blackhole-container {
  display: flex; flex-direction: column; align-items: center;
  position: sticky; top: 80px;
}
#blackhole-canvas {
  image-rendering: pixelated;
  cursor: pointer;
  max-width: 100%;
  height: auto;
}
.bh-label {
  font-size: .5rem; color: var(--cyan);
  text-shadow: var(--glow-c); margin-top: .5rem;
}
.bh-sublabel { font-family: var(--vt); color: var(--dim); font-size: 1rem; }
.bh-entropy-eq {
  font-family: var(--pixel); font-size: .5rem;
  color: var(--amber); text-shadow: var(--glow-a);
  margin-top: .3rem;
}

.research-areas {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
@media (max-width: 600px) { .research-areas { grid-template-columns: 1fr; } }

.research-card {
  padding: 1.2rem; cursor: pointer;
  transition: border-color .2s, box-shadow .2s, transform .1s;
  border-color: var(--border);
}
.research-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(0,229,255,.2);
  transform: translateY(-2px);
}
.rc-title { font-family: var(--pixel); font-size: .45rem; color: var(--cyan); margin-bottom: .5rem; line-height: 1.8; }
.rc-desc  { font-size: .8rem; color: var(--white); line-height: 1.6; margin-bottom: .5rem; }
.rc-papers { font-family: var(--pixel); font-size: .35rem; color: var(--amber); }

/* ── PUBLICATIONS ────────────────────────────────────────── */
.pub-filter {
  display: flex; gap: .5rem; flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.filter-btn {
  font-family: var(--pixel); font-size: .35rem;
  padding: .4rem .8rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--dim);
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0,229,255,.08);
  box-shadow: 0 0 8px rgba(0,229,255,.2);
}

.pub-list { display: flex; flex-direction: column; gap: .8rem; }
.pub-entry {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1rem 1.2rem;
  transition: border-color .2s, box-shadow .2s, transform .15s;
}
.pub-entry:hover {
  border-color: var(--cyan);
  box-shadow: inset 3px 0 0 var(--cyan), 0 0 20px rgba(0,229,255,.1);
  transform: translateX(4px);
}
.pub-num {
  font-family: var(--pixel); font-size: .45rem;
  color: var(--purple); min-width: 30px; padding-top: .2rem;
}
.pub-body { flex: 1; }
.pub-title   { color: var(--white); font-size: .9rem; line-height: 1.5; margin-bottom: .3rem; }
.pub-authors { color: var(--dim); font-size: .8rem; margin-bottom: .3rem; }
.pub-me      { color: var(--amber); font-weight: bold; }
.pub-journal { font-size: .8rem; margin-bottom: .3rem; }
.journal-tag {
  font-family: var(--pixel); font-size: .35rem;
  color: var(--bg);
  background: var(--cyan);
  padding: .15rem .4rem;
  margin-right: .4rem;
}
.arxiv-link {
  font-family: var(--pixel); font-size: .35rem;
  color: var(--purple); padding: .15rem .4rem;
  border: 1px solid var(--purple);
}
.arxiv-link:hover { background: rgba(180,79,255,.15); box-shadow: var(--glow-p); }
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  align-items: center;
  margin-top: .15rem;
}
.pub-leading {
  font-family: var(--pixel); font-size: .35rem;
  color: var(--amber); text-shadow: var(--glow-a);
  white-space: nowrap; align-self: center;
}
.pub-entry.hidden-pub { display: none; }

/* Forthcoming */
.forthcoming-list { display: flex; flex-direction: column; gap: .5rem; }
.forth-item {
  display: flex; gap: 1rem; align-items: flex-start;
  padding: .8rem 1rem; font-size: .85rem; line-height: 1.6;
}
.forth-num { color: var(--cyan); font-family: var(--pixel); font-size: .5rem; padding-top: .2rem; }
.forth-item b { color: var(--amber); }
.forth-item em { color: var(--white); font-style: italic; }

/* ── CONTACT ─────────────────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 700px) { .contact-layout { grid-template-columns: 1fr; } }

.contact-right { display: flex; flex-direction: column; gap: 1.5rem; }
.contact-links { padding: 1.2rem; display: flex; flex-direction: column; gap: .5rem; }
.contact-btn { width: 100%; text-align: center; }
/* Contact 右侧外链按钮：更紧凑 + 等高 */
.contact-links .contact-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 2.65rem;
  padding: .32rem .65rem;
  line-height: 1.25;
  font-size: .42rem;
}

.cat-quote {
  padding: 1.5rem; text-align: center;
  border-color: var(--amber);
}
.cq-cat { font-size: 2.5rem; margin-bottom: .8rem; animation: catBob 2s ease-in-out infinite; }
.cq-text { font-family: var(--vt); font-size: 1.2rem; color: var(--amber); line-height: 1.5; margin-bottom: 1rem; }

/* ── MUSIC PLAYER ────────────────────────────────────────── */
#music-player {
  position: fixed; bottom: 1rem; right: 1rem; z-index: 2000;
  width: 280px;
  max-width: calc(100vw - 1.5rem);
  border-color: var(--amber);
  box-shadow: 0 0 12px rgba(255,179,0,.25);
}
.player-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: .4rem .8rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255,179,0,.08);
}
.player-header button {
  background: none; border: none; cursor: pointer;
  font-family: var(--pixel); font-size: .5rem;
  color: var(--amber);
}
.pixel-label { font-family: var(--pixel); font-size: .35rem; color: var(--amber); }
#player-body { padding: .8rem; }

.vinyl {
  width: 60px; height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle at 50%,
    #1a1a2e 0%, #1a1a2e 25%,
    #111 26%, #333 28%, #111 30%,
    #222 35%, #111 42%, #222 48%,
    #111 55%, #222 60%, #111 68%,
    #222 73%, #111 80%,
    #222 85%, var(--amber) 86%, #222 88%
  );
  margin: 0 auto .5rem;
  border: 2px solid var(--amber);
  display: flex; align-items: center; justify-content: center;
  transition: animation .3s;
}
.vinyl.spinning { animation: spin 4s linear infinite; }
@keyframes spin { from { transform: rotate(0); } to { transform: rotate(360deg); } }
.vinyl-inner { font-size: .7rem; color: var(--amber); }

.player-info { text-align: center; margin-bottom: .45rem; }
.track-name   { font-family: var(--pixel); font-size: .35rem; color: var(--white); }
.track-detail { font-family: var(--vt); font-size: .9rem; color: var(--dim); }

.player-credit {
  font-family: var(--vt);
  font-size: 0.72rem;
  line-height: 1.35;
  color: var(--dim);
  margin: 0 0 .55rem;
  text-align: left;
  max-height: 5.5rem;
  overflow-y: auto;
}
.player-credit em { font-style: italic; color: rgba(255, 255, 255, 0.55); }

.player-progress-wrap {
  margin-bottom: .55rem;
}
.player-seek {
  display: block;
  width: 100%;
  height: 6px;
  margin: 0 0 .35rem;
  cursor: pointer;
  accent-color: var(--amber);
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 179, 0, 0.15);
  border-radius: 2px;
  border: 1px solid rgba(255, 179, 0, 0.35);
}
.player-seek::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 1px;
  background: var(--amber);
  box-shadow: 0 0 6px rgba(255, 179, 0, 0.5);
  cursor: pointer;
}
.player-seek::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 1px;
  border: none;
  background: var(--amber);
  cursor: pointer;
}
.player-time {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--vt);
  font-size: 0.78rem;
  color: var(--dim);
  letter-spacing: 0.02em;
}
#player-time-sep { opacity: 0.5; padding: 0 .2rem; }

.player-controls { display: flex; flex-direction: column; gap: .4rem; align-items: center; }
.ctrl-btn {
  font-family: var(--pixel); font-size: .6rem;
  background: var(--amber); color: var(--bg);
  border: none; cursor: pointer;
  padding: .3rem .7rem;
  transition: box-shadow .2s;
}
.ctrl-btn:hover { box-shadow: 0 0 10px var(--amber); }
.volume-wrap { display: flex; align-items: center; gap: .4rem; font-size: .7rem; color: var(--dim); width: 100%; }
#vol { flex: 1; accent-color: var(--amber); cursor: pointer; }

/* ── CAT CANVAS ──────────────────────────────────────────── */
#cat-canvas {
  position: fixed; bottom: 0; left: 0;
  width: 100vw; height: 280px;
  pointer-events: none;
  z-index: 9990;
  image-rendering: pixelated;
}

/* ── FOOTER ──────────────────────────────────────────────── */
footer {
  text-align: center; padding: 2rem 1rem;
  border-top: 2px solid var(--border);
  background: var(--bg);
}
.footer-cat-row { font-size: 1.2rem; margin-bottom: .5rem; min-height: 1.8rem; }
.footer-text {
  font-size: .35rem; color: var(--dim);
  margin-bottom: .5rem; letter-spacing: .05em;
}
.footer-eq { font-family: var(--vt); font-size: 1.1rem; color: var(--amber); }

/* ── SCROLL REVEAL ───────────────────────────────────────── */
.section, .pub-entry, .research-card, .edu-item {
  opacity: 0; transform: translateY(20px);
  transition: opacity .5s ease, transform .5s ease;
}
.section.visible, .pub-entry.visible, .research-card.visible, .edu-item.visible {
  opacity: 1; transform: translateY(0);
}

/* ── PIXEL PARTICLE ──────────────────────────────────────── */
.pixel-particle {
  position: fixed; pointer-events: none;
  width: 4px; height: 4px;
  z-index: 5000;
  image-rendering: pixelated;
  animation: particleFade .8s forwards;
}
@keyframes particleFade {
  0%   { opacity: 1; transform: translate(0,0) scale(1); }
  100% { opacity: 0; transform: translate(var(--tx), var(--ty)) scale(0); }
}

/* ── NEWS ────────────────────────────────────────────────── */
.news-feed { display: flex; flex-direction: column; gap: 1rem; }

.news-item {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1.2rem 1.4rem;
  transition: border-color .2s, box-shadow .2s, transform .15s;
}
.news-item:hover {
  transform: translateX(4px);
  box-shadow: inset 3px 0 0 var(--cyan), 0 0 20px rgba(0,229,255,.08);
}

.news-item--featured {
  border-color: var(--cyan);
  background: rgba(0,229,255,.04);
  box-shadow: inset 3px 0 0 var(--cyan), 0 0 24px rgba(0,229,255,.12);
}
.news-item--featured .news-title { color: var(--cyan); }

.news-meta {
  display: flex; flex-direction: column; align-items: center;
  gap: .4rem; min-width: 70px;
}
.news-badge {
  font-family: var(--pixel); font-size: .32rem;
  padding: .25rem .5rem; white-space: nowrap;
}
.news-badge--new   { background: var(--cyan);   color: var(--bg); }
.news-badge--phys  { background: var(--purple);  color: var(--bg); }
.news-badge--talk  { background: var(--amber);   color: var(--bg); }
.news-badge--paper { background: var(--green);   color: var(--bg); }

.news-date { font-family: var(--pixel); font-size: .32rem; color: var(--dim); text-align: center; }
.news-icon { font-size: 1.6rem; align-self: flex-start; padding-top: .1rem; flex-shrink: 0; }

/* min-width:0 让 flex 子项能收缩，正文才能占满剩余宽度并正常换行 */
.news-body { flex: 1; min-width: 0; }
.news-title {
  font-family: var(--pixel); font-size: .45rem;
  color: var(--white); line-height: 1.8; margin-bottom: .5rem;
}
.news-text { font-size: .85rem; color: var(--white); line-height: 1.7; overflow-wrap: anywhere; }
.news-text em { color: var(--amber); font-style: italic; }

/* 窄屏：徽章与图标占首行，正文单独一行通栏，避免「挤在右侧、每行只有几个词」 */
@media (max-width: 640px) {
  .news-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    column-gap: 0.75rem;
    row-gap: 0.65rem;
    padding: 1rem 1rem;
  }
  .news-meta {
    grid-column: 1;
    grid-row: 1;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-start;
    gap: 0.45rem 0.65rem;
    min-width: 0;
  }
  .news-icon {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
    padding-top: 0;
  }
  .news-body {
    grid-column: 1 / -1;
    grid-row: 2;
    min-width: 0;
  }
}

/* ── ACADEMIC INTERESTS ───────────────────────────────────── */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
  margin-bottom: 2rem;
}
@media (max-width: 600px) { .interests-grid { grid-template-columns: 1fr; } }

.interest-cluster {
  padding: 1.2rem;
  cursor: default;
  transition: border-color .2s, box-shadow .2s;
}

.interest-cluster--ai    { border-color: var(--cyan);   }
.interest-cluster--phys  { border-color: var(--purple); }
.interest-cluster--math  { border-color: var(--amber);  }
.interest-cluster--social{ border-color: var(--green);  }

.interest-cluster--ai:hover    { box-shadow: 0 0 18px rgba(0,229,255,.25),  inset 0 0 30px rgba(0,229,255,.04); }
.interest-cluster--phys:hover  { box-shadow: 0 0 18px rgba(180,79,255,.25), inset 0 0 30px rgba(180,79,255,.04); }
.interest-cluster--math:hover  { box-shadow: 0 0 18px rgba(255,179,0,.25),  inset 0 0 30px rgba(255,179,0,.04); }
.interest-cluster--social:hover{ box-shadow: 0 0 18px rgba(0,255,136,.25),  inset 0 0 30px rgba(0,255,136,.04); }

.ic-header {
  display: flex; align-items: center; gap: .8rem;
  margin-bottom: .75rem;
  user-select: none;
}
.ic-icon  { font-size: 1.6rem; }
.ic-title { font-size: .42rem; line-height: 1.9; flex: 1; }

.interest-cluster--ai    .ic-title { color: var(--cyan); }
.interest-cluster--phys  .ic-title { color: var(--purple); }
.interest-cluster--math  .ic-title { color: var(--amber); }
.interest-cluster--social .ic-title{ color: var(--green); }

/* 列表始终展开展示 */
.ic-items {
  list-style: none;
  max-height: none;
  overflow: visible;
  opacity: 1;
}

.ic-items li {
  font-size: .85rem; color: var(--white);
  padding: .3rem 0;
  border-bottom: 1px solid rgba(255,255,255,.04);
  display: flex; align-items: flex-start; gap: .5rem;
  line-height: 1.5;
}
.ic-items li:last-child { border-bottom: none; }
.ic-bullet {
  font-family: var(--pixel); font-size: .4rem;
  padding-top: .3rem; flex-shrink: 0;
}
.interest-cluster--ai     .ic-bullet { color: var(--cyan); }
.interest-cluster--phys   .ic-bullet { color: var(--purple); }
.interest-cluster--math   .ic-bullet { color: var(--amber); }
.interest-cluster--social .ic-bullet { color: var(--green); }

/* Connector */
.interests-connector {
  display: flex; align-items: center; gap: 1rem;
  margin-top: .5rem;
}
.connector-line {
  flex: 1; height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}
.connector-label {
  font-size: .35rem; color: var(--cyan);
  text-shadow: var(--glow-c); white-space: nowrap;
  letter-spacing: .08em;
}

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (min-width: 501px) {
  .nav-mobile-panel.is-open {
    display: none !important;
  }
}

@media (max-width: 500px) {
  .nav-links { display: none; }
  .nav-menu-toggle { display: flex; }

  .nav-mobile-panel {
    position: fixed;
    top: 52px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2500;
    display: none;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1rem 1.25rem 2rem;
    padding-bottom: max(2rem, env(safe-area-inset-bottom));
    background: rgba(7, 7, 15, 0.98);
    border-bottom: 2px solid var(--border);
    backdrop-filter: blur(10px);
  }
  .nav-mobile-panel.is-open {
    display: block;
  }
  .nav-links-mobile a {
    display: block;
    font-family: var(--pixel);
    font-size: .5rem;
    color: var(--dim);
    padding: 1rem 0.75rem;
    border-bottom: 1px solid var(--border);
    transition: color .2s, text-shadow .2s;
    -webkit-tap-highlight-color: transparent;
  }
  .nav-links-mobile li:last-child a {
    border-bottom: none;
  }
  .nav-links-mobile a:hover,
  .nav-links-mobile a:focus-visible {
    color: var(--cyan);
    text-shadow: var(--glow-c);
    outline: none;
  }

  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-buttons .pixel-btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  #music-player {
    width: min(280px, calc(100vw - 1rem));
    right: max(0.5rem, env(safe-area-inset-right));
    bottom: max(0.75rem, env(safe-area-inset-bottom));
  }
  .player-credit { font-size: 0.65rem; max-height: 4.8rem; }

  .interests-connector {
    flex-direction: column;
    gap: 0.75rem;
  }
  .interests-connector .connector-line {
    width: 100%;
    height: 2px;
    flex: none;
  }
  .connector-label {
    white-space: normal;
    text-align: center;
    line-height: 1.9;
    max-width: 100%;
  }

  .pub-leading { white-space: normal; }

  .filter-btn {
    min-height: 44px;
    padding: 0.45rem 0.9rem;
  }

  .footer-text {
    line-height: 1.9;
    padding: 0 0.25rem;
  }
}