/* ============================================================
   LEO GENG — PORTFOLIO
   Visual direction: black/white + glass, engineering HUD,
   visible 12-col grid, extreme type contrast, futuristic minimal.
   Display: Archivo (variable width) · Labels: IBM Plex Mono
   ============================================================ */

:root {
  --bg: #08090a;
  --ink: #f4f4f1;
  --ink-2: #9a9b96;
  --ink-3: #63645f;
  --line: rgba(244, 244, 241, .16);
  --line-faint: rgba(244, 244, 241, .05);
  --panel: rgba(244, 244, 241, .028);
  --panel-hover: rgba(244, 244, 241, .055);
  --status: #f4f4f1;                 /* 状态点：纯白（全站严格黑白灰）*/

  --font-display: "Archivo", system-ui, sans-serif;
  --font-body: "Archivo", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;

  --container: 1240px;
  --pad: clamp(16px, 4vw, 44px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 380;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container { max-width: var(--container); margin: 0 auto; padding-inline: var(--pad); }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 1px solid var(--ink); outline-offset: 3px; }

.mono {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: .04em;
}
.muted { color: var(--ink-2); }
.nowrap { white-space: nowrap; }
.hide-sm { display: inline; }

/* ---------- 可见 12 栏网格 ---------- */
.grid-overlay {
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
}
.grid-overlay .cols {
  max-width: var(--container); height: 100%;
  margin: 0 auto; padding-inline: var(--pad);
  display: grid; grid-template-columns: repeat(12, 1fr);
}
.grid-overlay .cols i { border-left: 1px solid var(--line-faint); }
.grid-overlay .cols i:last-child { border-right: 1px solid var(--line-faint); }
@media (max-width: 720px) {
  .grid-overlay .cols { grid-template-columns: repeat(4, 1fr); }
  .grid-overlay .cols i:nth-child(n+5) { display: none; }
}

main, .nav { position: relative; z-index: 1; }

/* ---------- 角标 + 记号 ---------- */
.corner-marks { position: relative; }
.corner-marks::before, .corner-marks::after {
  content: "+";
  position: absolute;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--ink-3);
  line-height: 1;
  pointer-events: none;
}
.corner-marks::before { top: 10px; left: 12px; }
.corner-marks::after { top: 10px; right: 12px; }

/* ---------- reveal 进场 ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

/* ---------- ① nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(8, 9, 10, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  min-height: 60px;
}
.brand {
  font-family: var(--font-display);
  font-variation-settings: "wdth" 122;
  font-weight: 520;
  font-size: .9rem;
  letter-spacing: .12em;
}
.brand-sup { font-size: .5em; font-weight: 400; vertical-align: super; color: var(--ink-2); }

.nav-status { font-size: .64rem; color: var(--ink-3); margin: 0; }

.nav-links { display: flex; gap: 34px; font-family: var(--font-mono); font-size: .74rem; letter-spacing: .08em; }
.nav-links sup { color: var(--ink-3); font-size: .7em; }
.nav-links a { position: relative; padding-block: 4px; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: var(--ink);
  transform: scaleX(0); transform-origin: right;
  transition: transform .3s cubic-bezier(.2,.7,.2,1);
}
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 10px; }
.nav-toggle span { display: block; width: 22px; height: 1.5px; background: var(--ink); margin: 5px 0; transition: transform .2s; }

@media (max-width: 860px) { .nav-status { display: none; } }
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(8, 9, 10, .96);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 18px var(--pad); border-top: 1px solid var(--line-faint); }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(3.2px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-3.2px) rotate(-45deg); }
}

/* ---------- ② hero ---------- */
.hero {
  padding-block: clamp(56px, 10vw, 140px);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}

.eyebrow {
  font-size: .68rem;
  color: var(--ink-2);
  margin: 0 0 26px;
  display: flex; align-items: center; gap: 10px;
}
.status-dot {
  position: relative;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--status);
  box-shadow: 0 0 8px var(--status);
  animation: pulse 2.4s ease-in-out infinite;
  flex: none;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }
/* 状态点向外扩散的光波（雷达 ping）*/
.status-dot::before, .status-dot::after {
  content: "";
  position: absolute; inset: 0;
  border-radius: 50%;
  border: 1px solid var(--status);
  animation: ping 2.6s cubic-bezier(.2,.6,.3,1) infinite;
}
.status-dot::after { animation-delay: 1.3s; }
@keyframes ping {
  0%   { transform: scale(1);   opacity: .7; }
  70%  { opacity: 0; }
  100% { transform: scale(4.6); opacity: 0; }
}

.hero-title {
  font-family: var(--font-display);
  font-variation-settings: "wdth" 125;
  font-weight: 480;
  font-size: clamp(2.1rem, 5.4vw, 3.9rem);
  line-height: 1;
  letter-spacing: .02em;
  text-transform: uppercase;
  margin: 0;
}
.hero-divider {
  width: 72px;
  height: 1px;
  background: rgba(244, 244, 241, .45);
  margin: 30px 0 34px;
}

.hero-sub { font-size: clamp(.92rem, 1.35vw, 1rem); max-width: 50ch; margin: 0 0 18px; color: var(--ink-2); }
.hero-sub.lead { font-size: clamp(1.05rem, 1.7vw, 1.3rem); font-weight: 340; line-height: 1.5; color: var(--ink); max-width: 44ch; }
.hero-cta { margin-top: 38px; }

/* 打字机光标 */
.js-type.typing::after {
  content: "";
  display: inline-block;
  width: .55em; height: 1.02em;
  margin-left: 2px;
  background: currentColor;
  vertical-align: -.14em;
  animation: caret .8s steps(1) infinite;
}
@keyframes caret { 50% { opacity: 0; } }

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  padding: 12px 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(6px);
  transition: background .2s, color .2s, border-color .2s;
}
.btn:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* hero motion HUD — 纯黑 */
.hero-motion {
  margin: 0;
  aspect-ratio: 1 / 1;
  max-width: 440px;
  width: 100%;
  justify-self: end;
  position: relative;
  border: 1px solid var(--line);
  background: #000;
}
.hero-motion canvas { width: 100%; height: 100%; display: block; }
.hud-label {
  position: absolute; left: 10px; bottom: 8px;
  font-size: .6rem; color: var(--ink-3); margin: 0;
}

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-motion { max-width: 100%; aspect-ratio: 16 / 9; justify-self: stretch; }
}

/* ---------- ticker ---------- */
.ticker {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.ticker-track {
  display: flex; white-space: nowrap;
  font-size: .66rem; color: var(--ink-2);
  padding-block: 9px;
  animation: tick 32s linear infinite;
}
.ticker-track span { flex: none; }
@keyframes tick { to { transform: translateX(-50%); } }

/* ---------- section head ---------- */
.section-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "title line index";
  align-items: baseline;
  gap: 18px;
  margin-bottom: clamp(26px, 4vw, 48px);
}
.section-title {
  grid-area: title;
  font-family: var(--font-display);
  font-variation-settings: "wdth" 125;
  font-weight: 460;
  font-size: clamp(1.3rem, 3vw, 2.1rem);
  letter-spacing: .03em;
  line-height: 1;
  margin: 0;
}
.section-index { grid-area: index; font-size: .64rem; color: var(--ink-3); }
.dash-line {
  grid-area: line;
  height: 1px;
  align-self: center;
  background: repeating-linear-gradient(90deg, var(--line) 0 6px, transparent 6px 12px);
  background-size: 12px 1px;
  animation: dashmove 1.6s linear infinite;
  opacity: .7;
}
@keyframes dashmove { to { background-position: 12px 0; } }

@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr auto; grid-template-areas: "title index" "line line"; }
}

/* ---------- ③ selected work ---------- */
.work { padding-block: clamp(48px, 7vw, 100px); }

.work-card {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(20px, 2.6vw, 32px);
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  margin-bottom: 20px;
  transition: background .25s, border-color .25s, transform .25s ease;
}
.work-card:hover {
  background: var(--panel-hover);
  border-color: rgba(244, 244, 241, .38);
  transform: translateY(-3px);
}
.work-card.corner-marks::before { top: 6px; left: 8px; }
.work-card.corner-marks::after { top: 6px; right: 8px; }

.card-media { display: block; min-height: 220px; position: relative; overflow: hidden; border: 1px solid var(--line); }
/* 真实封面图：黑白，hover 放大提亮（Selected Work 不加暗层）*/
.card-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
  display: block;
  filter: grayscale(1) contrast(1.03);
  transform-origin: center;
  transition: transform .6s cubic-bezier(.2,.7,.2,1), filter .45s ease;
  will-change: transform;
}
/* hover 时压暗图片本身，抵消各图亮度差异（亮图不会透过蒙版发白）*/
.work-card:hover .card-img { transform: scale(1.06); filter: grayscale(1) brightness(.45); }

/* 黑蒙版：仅 hover 出现，底图隐约可见，动画画在它上面 */
.card-scrim {
  position: absolute; inset: 0;
  background: #000;
  opacity: 0;
  transition: opacity .5s ease;
  pointer-events: none;
  z-index: 1;
}
.work-card:hover .card-scrim { opacity: .78; }

/* hover 时播放的 8 秒 HUD 动画（透明画布 + 跟随鼠标的 3D 倾斜）*/
.card-media { perspective: 900px; }
.card-anim {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
  opacity: 0;
  transition: opacity .5s ease;
  pointer-events: none;
  z-index: 2;
  transform-style: preserve-3d;
  will-change: transform;
}
.work-card:hover .card-anim { opacity: 1; }
/* 扫描线：hover 时掠过封面 */
.card-media::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(244,244,241,.07) 50%, transparent 100%);
  background-size: 100% 220%;
  background-position: 0 -120%;
  background-repeat: no-repeat;
  pointer-events: none;
}
.work-card:hover .card-media::after { animation: scan 1.1s cubic-bezier(.4,0,.2,1); }
@keyframes scan { from { background-position: 0 -120%; } to { background-position: 0 120%; } }

.card-meta { font-size: .62rem; color: var(--ink-3); margin: 2px 0 14px; }
.card-title {
  font-family: var(--font-display);
  font-variation-settings: "wdth" 112;
  font-weight: 470;
  font-size: clamp(1.1rem, 1.9vw, 1.4rem);
  letter-spacing: .008em;
  line-height: 1.25;
  margin: 0 0 12px;
}
.card-outcome { font-size: .92rem; color: var(--ink-2); margin: 0 0 16px; max-width: 52ch; }
.card-outcome strong { color: var(--ink); font-weight: 540; }

.tags { font-size: .62rem; color: var(--ink-3); margin: 0 0 18px; }
.card-open {
  font-size: .68rem; letter-spacing: .1em; color: var(--ink-2);
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: color .2s, border-color .2s;
}
.work-card:hover .card-open { color: var(--ink); border-color: var(--ink); }

@media (max-width: 860px) {
  .work-card { grid-template-columns: 1fr; }
  .card-media, .media-ph { min-height: 170px; }
}

/* ---------- ④ more work ---------- */
.more-work { padding-block: clamp(48px, 7vw, 100px); border-top: 1px solid var(--line); }

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

.rw-item { border-top: 1px solid var(--line); }
.rw-item:last-child { border-bottom: 1px solid var(--line); }

/* 行头（点击/悬停触发展开）*/
.rw-head {
  display: flex; align-items: baseline; gap: 20px;
  width: 100%; margin: 0; padding: 22px 8px;
  background: none; border: 0; color: inherit; text-align: left; cursor: pointer;
  font: inherit;
  transition: background .5s ease, padding .5s cubic-bezier(.22, 1, .36, 1);
}
.rw-item.open .rw-head { background: var(--panel); padding-block: 26px; }

.row-index { font-size: .62rem; color: var(--ink-3); flex: none; width: 44px; }
.row-title {
  flex: 1;
  font-family: var(--font-display);
  font-variation-settings: "wdth" 108;
  font-weight: 450;
  font-size: clamp(1rem, 1.9vw, 1.25rem);
  letter-spacing: .008em;
  line-height: 1.25;
  transition: font-size .5s cubic-bezier(.22, 1, .36, 1), color .3s;
}
.row-title em { font-style: normal; font-weight: 320; font-variation-settings: "wdth" 100; color: var(--ink-2); font-size: .78em; }
.row-meta { font-size: .64rem; color: var(--ink-3); white-space: nowrap; transition: color .3s; }

.rw-head:hover .row-title, .rw-item.open .row-title { font-size: clamp(1.15rem, 2.4vw, 1.55rem); }
.rw-item.open .row-meta { color: var(--ink); }

/* 展开面板：约 4× 行高，背景浮现项目图 */
.rw-panel {
  position: relative;
  max-height: 0; overflow: hidden;
  /* 目标高度由 JS 按真实内容高度设定 → 缓动曲线不再被固定值扭曲，丝滑不卡顿 */
  transition: max-height .5s cubic-bezier(.22, 1, .36, 1);
}

.rw-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  background-color: #0d0f11;
  filter: grayscale(1) contrast(1.03);   /* 代码转黑白 */
  opacity: 0;
  transition: opacity .55s ease;
}
/* 展开时：图浮现 + 缓慢 ken-burns 位移，作为小动效 */
.rw-item.open .rw-bg { opacity: .82; animation: rw-ken 12s ease-in-out infinite alternate; }
@keyframes rw-ken {
  from { transform: scale(1.06); }
  to   { transform: scale(1.14) translateY(-2.5%); }
}
/* 黑色透明层：左侧压暗给文字留空间 */
.rw-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(8,9,10,.95), rgba(8,9,10,.62) 55%, rgba(8,9,10,.85));
}
.rw-bg-label { position: absolute; right: 12px; bottom: 10px; font-size: .6rem; color: var(--ink-3); }

.rw-content {
  position: relative; z-index: 1;
  min-height: 260px;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 28px 8px 30px 64px; max-width: 640px;
}
.rw-desc {
  font-size: .98rem; line-height: 1.5; color: var(--ink);
  margin: 0 0 14px; min-height: 3em;
}
.rw-desc.typing::after {
  content: ""; display: inline-block;
  width: .5em; height: 1.05em; margin-left: 2px;
  background: currentColor; vertical-align: -.14em;
  animation: caret .8s steps(1) infinite;
}
.rw-tags { font-size: .62rem; color: var(--ink-2); margin: 0; }

@media (max-width: 720px) {
  .rw-head { flex-wrap: wrap; gap: 4px 12px; }
  .row-index { width: auto; }
  .row-title { flex-basis: 100%; order: 3; }
  .rw-content { padding-left: 8px; min-height: 220px; }
}

/* ---------- ⑤ contact ---------- */
.contact { position: relative; overflow: hidden; border-top: 1px solid var(--line); }
.contact-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.contact-inner { position: relative; z-index: 1; padding-block: clamp(56px, 9vw, 130px); }

/* 连接 console 面板：线条从右侧汇入这里 */
.contact-console {
  position: relative;
  display: block;
  max-width: 480px;
  padding: clamp(20px, 3vw, 30px) clamp(20px, 3vw, 32px);
  margin: 6px 0 32px;
  border: 1px solid rgba(244, 244, 241, calc(.13 + .55 * var(--live, 0)));
  background: rgba(244, 244, 241, calc(.015 + .03 * var(--live, 0)));
  box-shadow: 0 0 calc(var(--live, 0) * 38px) rgba(244, 244, 241, calc(var(--live, 0) * .14));
  transition: background .2s linear;
}
.contact-console.corner-marks::before { top: 7px; left: 9px; }
.contact-console.corner-marks::after { top: 7px; right: 9px; }

.contact-email {
  display: inline-block;
  font-family: var(--font-display);
  font-variation-settings: "wdth" 125;
  font-weight: 440;
  font-size: clamp(1.05rem, 2.6vw, 1.9rem);
  letter-spacing: .015em;
  line-height: 1.1;
  text-transform: uppercase;
  margin: 0 0 20px;
  word-break: break-word;
  transition: color .25s, text-shadow .3s;
}
.contact-email:hover { color: #fff; }
.contact.ready .contact-email { text-shadow: 0 0 22px rgba(244, 244, 241, .55); }

/* 连接 HUD + 进度条 */
.connect-hud { margin: 0; }
.connect-row {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: .66rem; letter-spacing: .1em; color: var(--ink-2);
  margin-bottom: 9px;
}
.connect-pct { color: var(--ink); font-variant-numeric: tabular-nums; }
.connect-bar { display: flex; gap: 2px; height: 14px; }
.connect-cell { flex: 1 1 0; background: rgba(244, 244, 241, .1); transition: background .12s ease, box-shadow .12s ease; }
.connect-cell.on { background: var(--ink); }
.connect-cell.head { box-shadow: 0 0 10px rgba(244, 244, 241, .75); }
.connect-hint {
  font-family: var(--font-body);
  font-size: .72rem; letter-spacing: .01em; color: var(--ink-3);
  margin: 13px 0 0; transition: color .3s;
}
.contact.ready .connect-hint, .contact.ready .connect-label { color: var(--ink); }

.footer-links { display: flex; flex-wrap: wrap; gap: 28px; font-size: .7rem; letter-spacing: .08em; color: var(--ink-2); }
.footer-links a { transition: color .2s; }
.footer-links a:hover { color: var(--ink); }

.status-bar { position: relative; z-index: 1; border-top: 1px solid var(--line); background: var(--panel); }
.status-cells {
  display: flex; justify-content: space-between; gap: 16px;
  font-size: .6rem; color: var(--ink-3);
  padding-block: 10px;
}
@media (max-width: 720px) { .hide-sm { display: none; } }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   PASSWORD GATE
   ============================================================ */
html.gate-lock body { visibility: hidden; }
#gate { visibility: visible; }

#gate {
  position: fixed; inset: 0; z-index: 99999;
  display: flex; align-items: center; justify-content: center;
  background: #08090a;
  padding: var(--pad);
  opacity: 1;
  transition: opacity .45s ease;
}
#gate.gate-out { opacity: 0; }
#gate::before {
  /* 网格背景，呼应主站 */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(244,244,241,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,244,241,.04) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at 50% 45%, #000 0%, transparent 72%);
}
.gate-inner {
  position: relative;
  width: 100%; max-width: 380px;
  text-align: center;
}
.gate-inner.shake, #gate.gate-shake .gate-inner { animation: gate-shake .4s; }
@keyframes gate-shake {
  10%,90% { transform: translateX(-2px); }
  30%,70% { transform: translateX(4px); }
  50% { transform: translateX(-6px); }
}
.gate-kicker {
  font-size: .62rem; letter-spacing: .12em; color: var(--ink-3);
  margin: 0 0 26px; display: flex; align-items: center; justify-content: center; gap: 9px;
}
.gate-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ink);
  box-shadow: 0 0 8px var(--ink); animation: pulse 2.2s ease-in-out infinite;
}
.gate-brand {
  font-family: var(--font-display); font-variation-settings: "wdth" 125;
  font-weight: 640; font-size: clamp(1.6rem, 7vw, 2.4rem); letter-spacing: .06em;
  margin: 0 0 30px;
}
.gate-brand sup { font-size: .4em; font-weight: 400; color: var(--ink-3); vertical-align: super; }
#gate-form { display: flex; flex-direction: column; gap: 12px; }
#gate-input {
  width: 100%; box-sizing: border-box;
  background: rgba(244,244,241,.03); color: var(--ink);
  border: 1px solid var(--line);
  padding: 14px 16px; font-family: var(--font-mono); font-size: .9rem;
  text-align: center; letter-spacing: .1em;
  transition: border-color .25s;
}
#gate-input:focus { outline: none; border-color: rgba(244,244,241,.5); }
#gate-input::placeholder { color: var(--ink-3); letter-spacing: .04em; }
.gate-btn {
  background: none; color: var(--ink); cursor: pointer;
  border: 1px solid var(--line); padding: 13px; font-size: .76rem; letter-spacing: .1em;
  transition: background .2s, color .2s, border-color .2s;
}
.gate-btn:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.gate-err { font-size: .6rem; letter-spacing: .1em; color: var(--ink-2); margin: 14px 0 0; min-height: 1em; }
.gate-foot { font-size: .58rem; letter-spacing: .06em; color: var(--ink-3); margin: 30px 0 0; }

/* 页面进场：解锁后 / 每次载入时，内容柔和淡入上浮（避免瞬间弹出）*/
@keyframes page-enter { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes page-enter-fade { from { opacity: 0; } to { opacity: 1; } }
html.page-enter main { animation: page-enter .6s cubic-bezier(.2,.7,.2,1) both; }
html.page-enter .nav,
html.page-enter .case-back,
html.page-enter .grid-overlay { animation: page-enter-fade .7s ease both; }
@media (prefers-reduced-motion: reduce) {
  html.page-enter main,
  html.page-enter .nav,
  html.page-enter .case-back,
  html.page-enter .grid-overlay { animation: none; }
}