/* ================================================================
   贝特通官网 · BEAMLINE「光路」
   视觉语言：一条 1px 氦氖红激光穿过五片光学元件的精密光具座。
   纪律：近黑 + 氦氖红 + 琥珀 + 紫外（全站不用蓝）；1px 线稿；
        无阴影、无描边字、无玻璃拟态、无圆角；等宽读数小字系统。
   ================================================================ */

:root {
  --bg: #0B0A09;
  --panel: #16130F;
  --paper: #F1EBE0;
  --ink: #1A1712;
  --red: #FF4A21;
  --red-dim: #B3300F;
  --amber: #F2B23E;
  --uv: #8E7DFF;
  --text: #F1EBE0;
  --dim: #9A948A;
  --faint: #6A655D;
  --line: rgba(241, 235, 224, .14);
  --line-strong: rgba(241, 235, 224, .26);
  --rail: #4A463F;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI",
    "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI", "Microsoft YaHei",
    "Noto Sans SC", sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", "Segoe UI Mono", Consolas,
    "Noto Sans Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.78 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--red); color: #0B0A09; }

a { color: inherit; text-decoration: none; }
h1, h2, h3, p, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img { display: block; }

/* 等宽读数小字系统：所有编号 / 标签 / 单位 / SHA 都用它，像仪器刻度 */
.mono {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
  line-height: 1.6;
}

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--red); color: #0B0A09; padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 0; }

/* ---------------------------------------------------------------- 顶栏 */

.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: 64px; background: var(--bg); border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.brand { display: flex; align-items: center; gap: 10px; }
.brand img { filter: grayscale(1) brightness(0) invert(1); opacity: .85; }
.brand-name { font-weight: 500; letter-spacing: .02em; font-size: 16px; }
.brand-name em { font-style: normal; font-family: var(--mono); font-size: 10px; letter-spacing: .18em; margin-left: 8px; color: var(--dim); }

.nav { display: flex; gap: 28px; }
.nav a { font-family: var(--mono); font-size: 10.5px; letter-spacing: .18em; color: var(--dim); transition: color .2s; }
.nav a:hover { color: var(--text); }

.topbar-actions { display: flex; align-items: center; gap: 16px; }

.lang { display: flex; border: 1px solid var(--line); }
.lang button {
  background: none; border: 0; color: var(--faint); cursor: pointer;
  font-family: var(--mono); font-size: 10px; letter-spacing: .14em;
  padding: 5px 9px;
}
.lang button.active { background: var(--panel); color: var(--text); }

.menu-btn { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.menu-btn span { display: block; width: 18px; height: 1px; background: var(--text); margin: 4px 0; }

/* ---------------------------------------------------------------- 按钮 */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 24px; border: 1px solid transparent; cursor: pointer;
  font-family: var(--sans); font-size: 14px; font-weight: 500; letter-spacing: .02em;
  transition: background .2s, border-color .2s, color .2s;
}
.btn-amber { background: var(--amber); color: #1A1712; }
.btn-amber:hover { background: #ffc464; }
.btn-ghost { border-color: var(--line-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--text); }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: #000; }
.btn-sm { padding: 9px 16px; font-size: 12.5px; }

/* ---------------------------------------------------------------- 首屏 */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 120px 0 72px;
  border-bottom: 1px solid var(--line);
}
.hero-grid { display: grid; grid-template-columns: 5fr 6fr; gap: 48px; align-items: center; }

.hero-label { color: var(--faint); margin-bottom: 28px; }
.hero-label span { color: var(--red); }

.slogan { font-size: clamp(44px, 6.4vw, 92px); line-height: 1.05; font-weight: 500; letter-spacing: -.01em; }
/* 光束书写：单层文字 + background-clip 渐变扫描，不用双层叠字——
   CJK 字体的内容区比 line-height 高，两层绝对定位会错位出重影 */
.slogan-txt {
  color: transparent;
  -webkit-text-fill-color: transparent;
  background-image: linear-gradient(90deg, var(--text) 50%, #3A3835 50%);
  background-size: 200% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  animation: beam-write 1.25s cubic-bezier(.2, .6, .2, 1) .15s forwards;
}
.slogan-line:nth-of-type(2) .slogan-txt { animation-delay: .45s; }
@keyframes beam-write { to { background-position: 0% 0; } }

.lead { margin-top: 26px; max-width: 46ch; color: var(--dim); font-size: 16px; }

.hero-actions { display: flex; align-items: center; gap: 16px; margin-top: 34px; }

/* 光具座画布区（右侧） */
.hero-rail { position: relative; height: 460px; }
#beam { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.holo-tip {
  position: absolute; z-index: 2; min-width: 150px; padding: 10px 12px;
  background: var(--panel); border: 1px solid var(--line-strong);
}
.holo-tip strong { display: block; color: var(--red); font-weight: 500; }
.holo-tip span { display: block; color: var(--dim); margin-top: 3px; }

.rail-labels { position: absolute; left: 0; right: 0; bottom: 0; height: 20px; color: var(--faint); }
.rail-labels span { position: absolute; transform: translateX(-50%); }
.rail-labels span:nth-child(1) { left: 12%; }
.rail-labels span:nth-child(2) { left: 32%; }
.rail-labels span:nth-child(3) { left: 52%; }
.rail-labels span:nth-child(4) { left: 72%; }
.rail-labels span:nth-child(5) { left: 92%; }

.hero-fig { position: absolute; left: 24px; bottom: 18px; color: var(--faint); }
.hero-hint { position: absolute; right: 24px; bottom: 18px; color: var(--faint); }

/* ---------------------------------------------------------------- 区块 */

.section { padding: 120px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 64px; }

.shead { margin-bottom: 56px; }
.shead-meta { display: flex; align-items: baseline; justify-content: space-between; color: var(--faint); }
.shead-meta .idx { color: var(--red); }
.shead-title { position: relative; margin-top: 22px; }
.shead-no {
  position: absolute; right: 0; top: -0.25em;
  font-size: clamp(96px, 14vw, 176px); line-height: 1; font-weight: 500;
  color: var(--faint); opacity: .16; pointer-events: none; user-select: none;
}
.shead-title h2 {
  position: relative; font-size: clamp(30px, 3.6vw, 52px); line-height: 1.12;
  font-weight: 500; letter-spacing: -.01em; max-width: 20ch;
}
.section-lead { margin-top: 18px; max-width: 66ch; color: var(--dim); font-size: 16px; }

/* ---------------------------------------------------------------- 02 光路 */

.bench { margin-bottom: 40px; }
.bench svg { width: 100%; height: auto; display: block; }
.bench .rail { stroke: var(--rail); stroke-width: 1; }
.bench .ticks line { stroke: rgba(241, 235, 224, .06); stroke-width: 1; }
.bench .beam-dim { stroke: rgba(241, 235, 224, .10); stroke-width: 1; fill: none; }
.bench .beam-lit { stroke: var(--red); stroke-width: 1; fill: none; }
.bench .fan line { stroke: rgba(241, 235, 224, .10); stroke-width: 1; }
.bench .fan line.lit { stroke: var(--red); }
.bench .nodes rect { fill: none; stroke: var(--dim); stroke-width: 1; }
.bench .nodes rect.lit { stroke: var(--amber); }
.bench .elements path, .bench .elements rect, .bench .elements line,
.bench .elements ellipse, .bench .elements circle { fill: none; stroke: #7A756C; stroke-width: 1; }
.bench .elements g.lit path, .bench .elements g.lit rect, .bench .elements g.lit line,
.bench .elements g.lit ellipse, .bench .elements g.lit circle { stroke: var(--text); }
.bench .grating rect, .bench .grating line { fill: none; stroke: #7A756C; stroke-width: 1; }
.bench .grating.lit rect, .bench .grating.lit line { stroke: var(--red); }

.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-bottom: 64px; }
.steps li { background: var(--bg); padding: 24px 20px; }
.steps .mono { color: var(--red); }
.steps h3 { margin: 12px 0 6px; font-size: 15px; font-weight: 500; }
.steps p { color: var(--dim); font-size: 13px; line-height: 1.6; }

.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.cap { background: var(--bg); padding: 30px 28px; }
.cap .mono { color: var(--red); }
.cap h3 { margin: 14px 0 6px; font-size: 16px; font-weight: 500; }
.cap p { color: var(--dim); font-size: 13.5px; }

/* ---------------------------------------------------------------- 03 换镜 */

.lens-rig { display: grid; grid-template-columns: 1fr 280px 1fr; gap: 36px; align-items: center; margin-bottom: 48px; }

.rig-proj { padding-right: 8px; }
.rig-nameplate {
  display: inline-block; padding: 8px 12px; border: 1px solid var(--line-strong);
  color: var(--dim);
}
.rig-ray { margin-top: 24px; height: 1px; background: var(--line); position: relative; }
.rig-ray span {
  position: absolute; left: 0; top: -1px; height: 3px; width: 36%;
  background: var(--red); opacity: .85; animation: ray-flow 2.6s ease-in-out infinite;
}
@keyframes ray-flow { 0% { left: 0; } 50% { left: 64%; } 100% { left: 0; } }

.rig-turret {
  position: relative; width: 280px; height: 280px; margin: 0 auto;
  border: 1px solid var(--line-strong); border-radius: 50%;
  outline: none; cursor: grab;
}
.rig-turret:focus-visible { box-shadow: 0 0 0 1px var(--red); }
.turret-rot { position: absolute; inset: 0; border-radius: 50%; transition: transform .3s cubic-bezier(.2, .7, .2, 1); }
.lens {
  position: absolute; width: 34px; height: 34px; left: 50%; top: 50%;
  margin: -17px 0 0 -17px; border: 1px solid var(--dim); border-radius: 50%;
}
.lens::after { content: ""; position: absolute; inset: 8px; border: 1px solid var(--line); border-radius: 50%; }
.lens[data-i="0"] { transform: translateY(-96px); }
.lens[data-i="1"] { transform: translateX(96px); }
.lens[data-i="2"] { transform: translateY(96px); }
.lens[data-i="3"] { transform: translateX(-96px); }
.lens.active { border-color: var(--red); }
.lens.active::after { border-color: var(--red); }
.turret-hub { position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px; background: var(--red); border-radius: 50%; }
.turret-readout {
  position: absolute; left: 50%; top: calc(100% + 20px); transform: translateX(-50%);
  color: var(--amber);
}

.rig-hint { text-align: center; color: var(--faint); margin-top: 56px; }

.rig-phone { position: relative; padding-left: 8px; }
.phone {
  width: 224px; margin-left: auto; border: 1px solid var(--line-strong);
  background: var(--panel); padding: 18px 16px;
  transition: filter .28s ease, opacity .28s ease;
}
.phone.blur { filter: blur(6px); opacity: .5; }
.phone-status { display: flex; justify-content: space-between; color: var(--faint); }
.phone-head { display: flex; align-items: baseline; gap: 8px; margin: 14px 0 4px; }
.phone-head strong { font-size: 15px; font-weight: 500; }
.phone-head .mono { color: var(--amber); }
.phone-metrics { margin-top: 12px; }
.phone-metrics .m-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 13.5px;
}
.phone-metrics .m-row span { color: var(--dim); }
.phone-metrics .m-row b { font-family: var(--mono); font-weight: 500; font-variant-numeric: tabular-nums; color: var(--text); }
.phone-ctl { display: flex; gap: 8px; margin: 16px 0; }
.phone-ctl button {
  flex: 1; padding: 10px 0; background: none; cursor: pointer;
  border: 1px solid var(--line-strong); color: var(--text); font-size: 13px;
}
.phone-ctl button.ghost { border-color: var(--line); color: var(--dim); }
.phone-tabs { display: flex; gap: 14px; color: var(--faint); }
.phone-tabs .active { color: var(--text); border-bottom: 1px solid var(--red); padding-bottom: 2px; }

.swap-note { position: absolute; right: 0; bottom: -30px; color: var(--red); opacity: 0; transition: opacity .4s; }
.swap-note.show { opacity: 1; }

.check { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.check li { position: relative; padding-left: 18px; color: var(--dim); font-size: 14px; }
.check li::before { content: "▸"; position: absolute; left: 0; color: var(--red); font-family: var(--mono); }

/* ---------------------------------------------------------------- 04 对位 */

.align { position: relative; border: 1px solid var(--line); padding: 26px; overflow-x: auto; }
.reg-mark { position: absolute; width: 13px; height: 13px; pointer-events: none; }
.reg-mark::before, .reg-mark::after { content: ""; position: absolute; background: var(--red); }
.reg-mark::before { width: 13px; height: 1px; left: 0; top: 6px; }
.reg-mark::after { width: 1px; height: 13px; left: 6px; top: 0; }
.reg-mark.tl { left: -6px; top: -6px; }
.reg-mark.tr { right: -6px; top: -6px; }
.reg-mark.bl { left: -6px; bottom: -6px; }
.reg-mark.br { right: -6px; bottom: -6px; }

.align-readout { position: absolute; top: -11px; right: 18px; background: var(--bg); padding: 0 8px; color: var(--amber); }

.console {
  display: grid; grid-template-columns: 170px 1fr 240px; min-width: 760px;
  background: var(--panel); border: 1px solid var(--line);
  transform: translateX(6px); opacity: .9;
  transition: transform .9s cubic-bezier(.2, .7, .2, 1), opacity .9s;
}
.align.in .console { transform: translateX(0); opacity: 1; }

.console-side { border-right: 1px solid var(--line); padding: 20px 16px; color: var(--dim); }
.console-logo { display: flex; align-items: center; gap: 8px; color: var(--text); margin-bottom: 20px; }
.console-logo img { filter: grayscale(1) brightness(0) invert(1); }
.side-item { padding: 9px 10px; cursor: default; }
.side-item.active { color: var(--text); border-left: 2px solid var(--red); background: var(--bg); }
.side-note { margin-top: 22px; color: var(--faint); }

.console-main { padding: 20px; }
.console-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.console-head strong { font-size: 15px; font-weight: 500; }
.mini-badge { padding: 3px 8px; border: 1px solid var(--amber); color: var(--amber); font-size: 10px; letter-spacing: .12em; }
.console-tabs { display: flex; gap: 18px; color: var(--faint); margin-bottom: 14px; }
.console-tabs .active { color: var(--text); border-bottom: 1px solid var(--red); padding-bottom: 2px; }
.console-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.console-table th { text-align: left; color: var(--faint); font-weight: 500; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.console-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); color: var(--text); }
.console-foot { display: flex; align-items: center; gap: 14px; margin-top: 16px; color: var(--faint); }
.mini-btn { padding: 6px 12px; border: 1px solid var(--line-strong); color: var(--text); cursor: pointer; }
.mini-btn.primary { border-color: var(--red); color: var(--red); }
.console-foot .dim { color: var(--faint); }

.console-ai { border-left: 1px solid var(--line); padding: 20px 16px; }
.ai-title { color: var(--uv); margin-bottom: 14px; }
.ai-spark { color: var(--uv); }
.ai-bubble { padding: 10px 12px; border: 1px solid var(--line); font-size: 12.5px; color: var(--dim); margin-bottom: 10px; }
.ai-bubble.bot { border-color: rgba(142, 125, 255, .35); }
.ai-diff { margin: 14px 0; padding: 12px; background: var(--bg); font-size: 11px; }
.ai-diff span { display: block; padding: 3px 0; }
.diff-del { color: var(--red); text-decoration: line-through; }
.diff-add { color: var(--uv); }
.ai-actions { display: flex; gap: 8px; }

.mini-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 40px; }
.mini { background: var(--bg); padding: 24px 20px; }
.mini h3 { font-size: 15px; font-weight: 500; margin-bottom: 6px; }
.mini p { color: var(--dim); font-size: 13px; }

/* ---------------------------------------------------------------- 05 台面 */

.infra-table {
  position: relative; height: 18px; margin-bottom: 56px;
  border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line);
  background: linear-gradient(var(--panel), var(--panel)) center / 100% 1px no-repeat;
}
.th-holes {
  position: absolute; left: 0; right: 0; top: 50%; height: 10px; transform: translateY(-50%);
  background: radial-gradient(circle at 12px 50%, var(--faint) 2px, transparent 2.5px) 0 0 / 120px 10px repeat-x;
  opacity: .6;
}

.rulers { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-bottom: 40px; }
.ruler { background: var(--bg); padding: 26px 20px; position: relative; }
.ruler .mono { color: var(--red); }
.ruler h3 { margin: 12px 0 6px; font-size: 14.5px; font-weight: 500; }
.ruler p { color: var(--dim); font-size: 13px; }
.seal { width: 22px; height: 16px; margin-top: 12px; border: 1px solid var(--dim); position: relative; }
.seal::after { content: ""; position: absolute; left: 9px; top: 3px; width: 4px; height: 6px; border: 1px solid var(--dim); border-bottom: 0; }
.wave { width: 100%; height: 26px; margin-top: 12px; }
.wave polyline { fill: none; stroke: var(--amber); stroke-width: 1; }

.adopted { text-align: right; color: var(--faint); }
.adopted .sep { color: var(--red); }

/* ---------------------------------------------------------------- 06 光桌（反相） */

.section--paper { background: var(--paper); color: var(--ink); }
.section--paper .shead-meta { color: #8A8478; }
.section--paper .shead-meta .idx { color: var(--red-dim); }
.section--paper .shead-no { color: var(--ink); opacity: .08; }
.section--paper .section-lead { color: #6A655D; }
.section--paper .shead-title h2 { color: var(--ink); }

.cal-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cal-card {
  border: 1px solid var(--ink); padding: 26px 24px;
  background: transparent; color: var(--ink);
  display: flex; flex-direction: column;
}
.cal-head { color: var(--red-dim); margin-bottom: 18px; }
.cal-card h3 { font-size: 18px; font-weight: 500; }
.cal-sub { color: #6A655D; font-size: 13px; margin: 6px 0 18px; }
.cal-sha {
  font-size: 10px; letter-spacing: .08em; text-transform: none;
  color: #6A655D; word-break: break-all; padding: 12px;
  border: 1px solid rgba(26, 23, 18, .18); margin-bottom: 16px;
}
.cal-foot { display: flex; align-items: center; gap: 12px; color: #6A655D; margin-bottom: 18px; }
.cal-foot .copy-btn {
  margin-left: auto; background: none; border: 1px solid var(--ink); color: var(--ink);
  padding: 5px 10px; cursor: pointer; font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
}
.cal-card .btn { align-self: flex-start; margin-top: auto; }

.dl-warning { margin-top: 26px; color: #6A655D; font-size: 13px; }

/* ---------------------------------------------------------------- 07 接通 */

.contact { border-bottom: 0; }
.contact-inner { display: grid; grid-template-columns: 320px 1fr; gap: 56px; align-items: center; }

.iris svg { width: min(320px, 70vw); display: block; }
.iris-blades { transform-origin: 100px 100px; transform: scale(.32); opacity: .4; transition: transform 1.5s cubic-bezier(.2, .7, .2, 1), opacity 1.2s; }
.iris-blades path { fill: var(--panel); stroke: var(--line-strong); stroke-width: 1; }
.iris-ring { fill: none; stroke: var(--red); stroke-width: 1; stroke-dasharray: 540; stroke-dashoffset: 540; transition: stroke-dashoffset 1.8s .25s cubic-bezier(.2, .7, .2, 1); }
.iris.in .iris-blades { transform: scale(1); opacity: 1; }
.iris.in .iris-ring { stroke-dashoffset: 0; }

.contact-copy .shead-meta { justify-content: flex-start; gap: 18px; }
.contact-copy h2 { font-size: clamp(30px, 3.6vw, 52px); line-height: 1.12; font-weight: 500; margin: 20px 0 8px; }
.contact-mail { font-family: var(--mono); font-size: clamp(20px, 3vw, 34px); letter-spacing: .02em; color: var(--amber); }
.contact-mail:hover { color: #ffc464; }
.contact-copy .section-lead { margin-top: 14px; }
.contact-copy .hero-actions { margin-top: 26px; }
.contact-note { color: var(--faint); font-size: 13px; }

.coop { margin-top: 44px; border-top: 1px solid var(--line); }
.coop > div { display: grid; grid-template-columns: 220px 1fr; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.coop .mono { color: var(--red); }
.coop p { color: var(--dim); font-size: 14px; }

/* ---------------------------------------------------------------- 页脚 */

.footer { border-top: 1px solid var(--line); padding: 56px 0 40px; }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { filter: grayscale(1) brightness(0) invert(1); opacity: .2; }
.footer-brand span { font-weight: 500; }
.footer-brand em { font-style: normal; font-family: var(--mono); font-size: 10px; letter-spacing: .18em; color: var(--dim); margin-left: 6px; }
.footer-slogan { color: var(--dim); font-size: 14px; }
.footer-links { display: flex; gap: 24px; color: var(--faint); }
.footer-links a:hover { color: var(--text); }
.footer-copy { color: var(--faint); }

/* ---------------------------------------------------------------- 入场 */

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------------------------------------------------------------- 响应式 */

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero { min-height: auto; padding: 120px 0 64px; }
  .hero-rail { height: 340px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .lens-rig { grid-template-columns: 1fr; gap: 40px; }
  .rig-phone { padding-left: 0; }
  .phone { margin: 0 auto; }
  .rig-ray { display: none; }
  .rulers { grid-template-columns: repeat(2, 1fr); }
  .mini-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-inner { grid-template-columns: 1fr; gap: 40px; }
  .iris svg { margin: 0 auto; }
}

@media (max-width: 720px) {
  .nav {
    position: fixed; top: 64px; left: 0; right: 0; background: var(--bg);
    border-bottom: 1px solid var(--line); flex-direction: column; gap: 0;
    padding: 8px 24px 16px; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .menu-btn { display: block; }
  .topbar-actions .btn { display: none; }
  .cap-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .cal-cards { grid-template-columns: 1fr; }
  .rulers { grid-template-columns: 1fr; }
  .mini-grid { grid-template-columns: 1fr; }
  .check { grid-template-columns: repeat(2, 1fr); }
  .coop > div { grid-template-columns: 1fr; gap: 8px; }
  .hero-fig, .hero-hint { display: none; }
  .slogan { font-size: clamp(38px, 11vw, 56px); }
}

/* ---------------------------------------------------------------- 减少动态 */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .slogan-txt { animation: none; background-position: 0% 0; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .rig-ray span, .ray-flow { animation: none; }
  .iris-blades { transform: scale(1); opacity: 1; transition: none; }
  .iris-ring { stroke-dashoffset: 0; transition: none; }
  .console { transform: none; transition: none; }
  .turret-rot { transition: none; }
}