/* ============================================================
 * 文山鑫娅传媒工作室官网 v7 ·「工业黑银 × AI 数据流」
 * 按开发脚本落地：#050508 炭黑 / #00E4FF 电光青 / #FF3D30 机械红
 * 银灰磨砂边框；GSAP+ScrollTrigger 滚动控帧；无蓝紫无渐变滥用
 * ============================================================ */
:root {
  --bg-black: #050508;      /* 背景主色：纯炭黑 */
  --bg-grey: #0f1014;       /* 辅助底色：深石墨灰 */
  --tech-cyan: #00e4ff;     /* 科技主色：电光青 */
  --tech-red: #ff3d30;      /* 点缀警示：机械红 */
  --metal-border: rgba(220, 220, 220, 0.15);
  --text-white: #ffffff;
  --text-grey: #b0b4c0;
  --text-dark-grey: #777a88;
  --ease-tech: cubic-bezier(0.2, 0.8, 0.2, 1);
  --cyan-dim: rgba(0, 228, 255, 0.1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-black);
  color: var(--text-grey);
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: rgba(0, 228, 255, 0.25); color: #fff; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ============ 全局视觉层 ============ */
.progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--tech-cyan); box-shadow: 0 0 12px var(--tech-cyan);
  z-index: 300;
}
.page-scan-line {
  position: fixed; left: 0; top: 0; width: 0; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 228, 255, 0.15), transparent);
  z-index: 999; pointer-events: none;
}
.grain {
  position: fixed; inset: 0; z-index: 200; pointer-events: none; opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

/* ============ 金属磨砂卡片 / 按钮（文档样式） ============ */
.tech-card {
  background: var(--bg-grey);
  border: 1px solid var(--metal-border);
  border-radius: 6px;
  transition: all 200ms var(--ease-tech);
}
.tech-card:hover {
  border-color: var(--tech-cyan);
  box-shadow: 0 0 16px rgba(0, 228, 255, 0.08);
}
.tech-btn-primary,
.tech-btn-default {
  display: inline-block;
  background: transparent;
  border: 1px solid var(--tech-cyan);
  color: var(--tech-cyan);
  padding: 13px 30px; border-radius: 4px;
  text-decoration: none; font-size: 15.5px;
  transition: all 200ms var(--ease-tech);
  position: relative; overflow: hidden;
}
.tech-btn-primary:hover {
  background: rgba(0, 228, 255, 0.1);
  box-shadow: 0 0 12px rgba(0, 228, 255, 0.15);
}
.tech-btn-primary:active { transform: scale(0.98); }
.tech-btn-default { border-color: var(--metal-border); color: var(--text-white); }
.tech-btn-default:hover { border-color: var(--text-white); background: rgba(255, 255, 255, 0.05); }

/* 电光青文字扫描 */
.text-scan { position: relative; overflow: hidden; }
.text-scan::after {
  content: ""; position: absolute; left: -100%; top: 0; width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 228, 255, 0.3), transparent);
  animation: textScan 4s infinite linear; pointer-events: none;
}
@keyframes textScan { 100% { left: 100%; } }

/* 机械呼吸微光 */
.breath-light { animation: breath 6s infinite ease-in-out; }
@keyframes breath {
  0%, 100% { box-shadow: inset 0 0 0 rgba(0,228,255,0), 0 0 8px rgba(0,228,255,0.05); }
  50% { box-shadow: inset 0 0 0 rgba(0,228,255,0), 0 0 22px rgba(0,228,255,0.12); }
}

/* ============ 导航 ============ */
header.site {
  position: sticky; top: 0; z-index: 100;
  padding: 18px 0;
  background: transparent; border-bottom: 1px solid transparent;
  transition: padding 0.3s var(--ease-tech), background 0.3s var(--ease-tech), border-color 0.3s var(--ease-tech);
}
header.site.scrolled {
  padding: 12px 0;
  background: rgba(5, 5, 8, 0.85);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--metal-border);
}
header.site .wrap { display: flex; justify-content: space-between; align-items: center; }
header.site .brand { font-size: 18px; font-weight: 700; color: var(--text-white); text-decoration: none; letter-spacing: 0.02em; }
header.site .brand span { color: var(--tech-cyan); }
nav.main a {
  color: var(--text-grey); text-decoration: none; margin-left: 26px; font-size: 14.5px;
  transition: color 0.2s var(--ease-tech); position: relative;
}
nav.main a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 1px;
  background: var(--tech-cyan); transition: width 0.25s var(--ease-tech);
  box-shadow: 0 0 8px var(--tech-cyan);
}
nav.main a:hover { color: var(--text-white); }
nav.main a:hover::after { width: 100%; }
nav.main a.active { color: var(--text-white); }

/* ============ Screen 1｜首屏 ============ */
.hero-section {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  overflow: hidden;
}
.hero-parallax-bg { position: absolute; inset: -40px; will-change: transform; }
.hero-video { width: 100%; height: 100%; object-fit: cover; opacity: 0.85; will-change: transform; }
.hero-veil {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(5,5,8,0.55) 0%, rgba(5,5,8,0.2) 40%, rgba(5,5,8,0.92) 100%),
    radial-gradient(ellipse 60% 50% at 30% 45%, rgba(5,5,8,0.35), transparent 70%);
}
.hero-inner { position: relative; z-index: 2; }
.hero-title {
  font-size: clamp(34px, 5vw, 60px);
  font-weight: 800; line-height: 1.2; letter-spacing: 0.01em;
  color: var(--text-white); margin-bottom: 18px;
  position: relative; overflow: hidden; display: inline-block;
}
.hero-title .t-ch {
  display: inline-block; opacity: 0; transform: translateY(18px);
  transition: opacity 0.45s var(--ease-tech), transform 0.45s var(--ease-tech);
  white-space: pre;
}
.hero-title .t-ch.on { opacity: 1; transform: none; }
.hero-desc { color: var(--text-grey); font-size: 17px; margin-bottom: 34px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-brand-line { margin-top: 26px; font-size: 13px; color: var(--text-dark-grey); letter-spacing: 0.06em; }
.scroll-hint {
  position: relative; z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-dark-grey); font-size: 12px; letter-spacing: 0.2em;
  padding-bottom: 24px; margin-top: auto;
}
.scroll-hint span { width: 1px; height: 34px; background: var(--metal-border); position: relative; overflow: hidden; }
.scroll-hint span::after {
  content: ""; position: absolute; left: 0; top: -40%; width: 100%; height: 40%;
  background: var(--tech-cyan); animation: drop 1.8s var(--ease-tech) infinite;
}
@keyframes drop { to { top: 110%; } }

/* ============ 屏幕区块通用 ============ */
section { padding: 100px 0; position: relative; }
section.alt { background: var(--bg-grey); border-top: 1px solid var(--metal-border); border-bottom: 1px solid var(--metal-border); }
section .wrap { position: relative; z-index: 1; }

/* ---- 区块背景视频（文档分配规则）----
 * 视频绝对定位铺满 + object-fit:cover 禁止拉伸；
 * 文字内容层 z-index 高于视频；弱网失败时海报背景图兜底 */
section.has-video { background-color: transparent; background-size: cover; background-position: center; }
section.has-video.alt { background-color: transparent; }
.section-video {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: 0;
  pointer-events: none;
}
section.has-video video.video-failed { display: none; }
.section-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg,
    rgba(5, 5, 8, 0.78) 0%,
    rgba(5, 5, 8, 0.55) 45%,
    rgba(5, 5, 8, 0.88) 100%);
}
.section-overlay-deep {
  background: linear-gradient(180deg,
    rgba(5, 5, 8, 0.86) 0%,
    rgba(5, 5, 8, 0.72) 50%,
    rgba(5, 5, 8, 0.92) 100%);
}
section.has-video .ghost-word { z-index: 2; }

h2.sec { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; color: var(--text-white); letter-spacing: 0.01em; margin-bottom: 12px; }
p.sec-sub { color: var(--text-grey); margin-bottom: 52px; font-size: 15px; }
.accent-link { color: var(--tech-cyan); text-decoration: none; border-bottom: 1px solid rgba(0,228,255,0.3); }
.accent-link:hover { color: #fff; }
.eyebrow { font-size: 12.5px; color: var(--tech-cyan); letter-spacing: 0.18em; margin-bottom: 10px; font-weight: 600; }

/* 幽灵描边大字 */
.ghost-word {
  position: absolute; top: 40px; right: -1vw;
  font-size: clamp(90px, 15vw, 220px); font-weight: 800; line-height: 1;
  color: transparent; -webkit-text-stroke: 1px rgba(220, 220, 220, 0.07);
  pointer-events: none; user-select: none; white-space: nowrap;
}

/* 标题逐字揭示（.split） */
.ch-mask { display: inline-block; overflow: hidden; vertical-align: bottom; }
.split .ch { display: inline-block; transform: translateY(110%); transition: transform 0.7s var(--ease-tech); }
.split.split-in .ch { transform: none; }

/* ---- Screen 2：平行立体景深三卡 + 粒子场 + 脉冲连线 ---- */
.service-head { text-align: center; }
.service-head .sec-sub { margin-bottom: 20px; }

/* 粒子场（文档方案：DOM 粒子） */
.particle-field {
  position: absolute; inset: 0;
  pointer-events: none; overflow: hidden; z-index: 2;
}
.particle {
  position: absolute;
  width: 3px; height: 3px; border-radius: 50%;
  background: #00e4ff; opacity: 0.6;
  animation: floatParticle linear infinite;
}
.particle.secondary { background: #e8f7ff; }
@keyframes floatParticle {
  0% { transform: translate(0, 0); opacity: 0.4; }
  50% { opacity: 0.8; }
  100% { transform: translate(40px, -60px); opacity: 0.4; }
}

/* 卡间脉冲连接线 */
.pulse-line {
  position: absolute; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 228, 255, 0.4), transparent);
  pointer-events: none; z-index: 2;
}
.pulse-line::after {
  content: ""; position: absolute; top: -2px;
  width: 5px; height: 5px; border-radius: 50%;
  background: #00e4ff; box-shadow: 0 0 6px #00e4ff;
  animation: pulseFlow 3s linear infinite;
}
@keyframes pulseFlow {
  0% { left: 0; opacity: 1; }
  100% { left: 100%; opacity: 0.3; }
}
.pulse-line-l { left: calc(50% - 196px); width: 72px; top: 50%; }
.pulse-line-r { left: calc(50% + 124px); width: 72px; top: 50%; }

/* 平行立体景深布局（文档 CSS：perspective + translateZ 分层） */
.service-stage {
  position: relative; z-index: 3;
  display: flex; justify-content: center; align-items: center;
  gap: 2rem;
  perspective: 1200px;
  padding: 3rem 2rem 4rem;
}
.service-card-item {
  width: 320px;
  background: rgba(15, 16, 20, 0.88);
  backdrop-filter: blur(8px);
  border: 1px solid var(--metal-border);
  border-radius: 8px;
  padding: 24px 24px 20px;
  position: relative; overflow: hidden;
  transform-style: preserve-3d;
  transition: all 0.5s var(--ease-tech);
  will-change: transform;
  box-shadow: 0 0 12px rgba(0, 228, 255, 0.35), 0 14px 34px rgba(0, 0, 0, 0.45);
}
.service-card-item:nth-child(2) {
  transform: translateZ(40px) scale(1.08);
  z-index: 2;
}
.service-card-item:nth-child(1),
.service-card-item:nth-child(3) {
  transform: translateZ(-20px) scale(0.92);
  z-index: 1;
  opacity: 0.85;
}
.service-card-item:hover {
  transform: translateZ(60px) scale(1.05);
  border-color: #00e4ff;
  box-shadow: 0 0 20px rgba(0, 228, 255, 0.25), 0 16px 40px rgba(0, 0, 0, 0.55);
  z-index: 3;
}

/* 卡片边缘扫描线（文档方案：水平往返） */
.service-card-item::before {
  content: ""; position: absolute; top: 0; left: 0;
  width: 100%; height: 1px;
  background: linear-gradient(90deg, transparent, #00e4ff, transparent);
  animation: edgeScan 4s ease-in-out infinite;
  opacity: 0.5; pointer-events: none;
}
@keyframes edgeScan {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}
/* 克制的电流闪烁：低频率轻微提亮 */
.service-card-item::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  animation: card-flicker 6s infinite steps(1);
}
@keyframes card-flicker {
  0%, 91%, 94%, 100% { box-shadow: inset 0 0 0 0 rgba(0, 228, 255, 0); }
  92% { box-shadow: inset 0 0 12px 1px rgba(0, 228, 255, 0.14); }
  93% { box-shadow: inset 0 0 2px 0 rgba(0, 228, 255, 0.05); }
}
.service-card-item .card-tag { color: var(--tech-cyan); font-size: 12px; letter-spacing: 0.1em; margin-bottom: 8px; font-weight: 600; }
.service-card-item h3 { font-size: 19px; color: var(--text-white); margin-bottom: 8px; }
.service-card-item p { font-size: 13.5px; color: var(--text-grey); margin-bottom: 12px; }
.service-card-item .for { font-size: 12.5px; color: var(--text-dark-grey); border-top: 1px solid var(--metal-border); padding-top: 12px; }
.service-card-item .for b { color: var(--tech-cyan); font-weight: 500; }
.card-tag { color: var(--tech-cyan); font-size: 12.5px; letter-spacing: 0.1em; margin-bottom: 10px; font-weight: 600; }
.service-card h3 { font-size: 22px; color: var(--text-white); margin-bottom: 10px; }
.service-card p { font-size: 14.5px; margin-bottom: 14px; }
.service-card .for { font-size: 13px; color: var(--text-dark-grey); border-top: 1px solid var(--metal-border); padding-top: 14px; }
.service-card .for b { color: var(--tech-cyan); font-weight: 500; }

/* ============ Screen 3｜生产流程：机械流水线 ============ */
.flow-line-wrap {
  display: flex; align-items: flex-start; gap: 0;
  margin-bottom: 44px;
}
.flow-item { flex: 1; min-width: 0; text-align: center; padding: 0 12px; }
.flow-node {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--text-dark-grey); margin: 0 auto 18px;
  transition: all 300ms var(--ease-tech);
}
.flow-node.active {
  background: var(--tech-cyan);
  box-shadow: 0 0 12px var(--tech-cyan);
}
.flow-item h4 { font-size: 16px; color: var(--text-white); margin-bottom: 8px; }
.flow-item p { font-size: 13.5px; color: var(--text-grey); }
.flow-line {
  flex: 0 0 56px; height: 1px; background: var(--metal-border);
  position: relative; margin-top: 26px;
}
.flow-line::after {
  content: ""; position: absolute; left: 0; top: 0; width: 0; height: 100%;
  background: var(--tech-cyan); box-shadow: 0 0 8px var(--tech-cyan);
  transition: width 600ms var(--ease-tech);
}
.flow-line.active::after { width: 100%; }

.highlight-box {
  background: rgba(5, 5, 8, 0.82);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(0, 228, 255, 0.3);
  border-left: 3px solid var(--tech-cyan);
  border-radius: 6px; padding: 26px 30px;
}
.highlight-box h3 { font-size: 19px; color: var(--text-white); margin: 6px 0 10px; }
.highlight-box p { font-size: 14.5px; color: var(--text-grey); }
.highlight-box p b { color: var(--tech-cyan); font-weight: 600; }

/* ============ Screen 4｜数据仪表盘 ============ */
.data-dashboard { overflow: hidden; }
.dash-scan {
  position: absolute; left: 0; top: 0; width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 228, 255, 0.5), transparent);
  animation: dash-scan 6s linear infinite;
  pointer-events: none;
}
@keyframes dash-scan { 0% { top: -2px; } 100% { top: 100%; } }
.dash-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px; margin-bottom: 52px;
}
.dash-card { padding: 24px 22px; transition: all 200ms var(--ease-tech); background: rgba(15, 16, 20, 0.8); backdrop-filter: blur(6px); }
.dash-card.alert { border-color: var(--tech-red); box-shadow: 0 0 14px rgba(255, 61, 48, 0.25); }
.dash-label { color: var(--text-grey); font-size: 13px; margin-bottom: 8px; }
.dash-value {
  font-size: 38px; font-weight: 800; line-height: 1;
  color: var(--tech-cyan); font-variant-numeric: tabular-nums;
}
.dash-value i { font-style: normal; font-size: 14px; color: var(--text-dark-grey); margin-left: 4px; }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
ul.tick { list-style: none; }
ul.tick li { padding-left: 24px; position: relative; margin-bottom: 16px; font-size: 15px; color: var(--text-grey); }
ul.tick li b { color: var(--text-white); font-weight: 600; }
ul.tick li::before {
  content: ""; position: absolute; left: 0; top: 0.72em;
  width: 10px; height: 2px; background: var(--tech-cyan);
}

/* ============ Screen 5｜Agent 矩阵 ============ */
.ai-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; margin-bottom: 52px; }
.ai-item { padding: 28px 26px; background: rgba(15, 16, 20, 0.85); }
.ai-item h3 { font-size: 18px; color: var(--text-white); margin-bottom: 10px; }
.ai-item p { font-size: 14.5px; }

.agent-heading { font-size: 20px; color: var(--text-white); font-weight: 700; margin-bottom: 24px; }
.agent-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.agent-card { padding: 24px 24px; }
.agent-card h4 { font-size: 15px; color: var(--text-white); margin-bottom: 8px; }
.agent-card h4::before { content: "▸"; color: var(--tech-cyan); margin-right: 8px; font-size: 12px; }
.agent-card p { font-size: 13.5px; }
.agent-note {
  margin-top: 24px; font-size: 14px; color: var(--text-grey);
  border-left: 3px solid var(--tech-cyan); padding-left: 16px;
}

/* ============ Screen 6｜FAQ 折叠 ============ */
.faq-item {
  border: 1px solid var(--metal-border); border-radius: 6px;
  margin-bottom: 14px; overflow: hidden;
  transition: border-color 200ms var(--ease-tech);
}
.faq-item.active { border-color: var(--tech-cyan); }
.faq-title {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 22px; cursor: pointer;
  font-size: 15.5px; font-weight: 600; color: var(--text-white);
  list-style: none; user-select: none;
}
.faq-arrow {
  color: var(--tech-cyan); transition: transform 400ms var(--ease-tech);
  flex-shrink: 0;
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-content {
  max-height: 0; overflow: hidden;
  transition: max-height 400ms var(--ease-tech);
}
.faq-content p { padding: 0 22px 20px; font-size: 14.5px; }
.faq-item.active .faq-content { max-height: 420px; }

/* ============ Screen 7｜联系转化 ============ */
.contact {
  background: var(--bg-grey); text-align: center; overflow: hidden;
  border-top: 1px solid var(--metal-border);
}
.contact-streams {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.5;
  background-image:
    linear-gradient(90deg, transparent 0%, transparent calc(100% - 1px), rgba(0,228,255,0.08) 100%),
    linear-gradient(rgba(0,228,255,0.045) 1px, transparent 1px);
  background-size: 220px 100%, 100% 44px;
}
.footer-convert { position: relative; z-index: 1; }
.contact h2 { font-size: clamp(26px, 3.4vw, 38px); color: var(--text-white); font-weight: 800; margin-bottom: 10px; }
.contact p { color: var(--text-grey); margin-bottom: 6px; }
.contact .tel {
  color: var(--tech-cyan); font-size: 22px; font-weight: 700;
  margin: 18px 0 8px; letter-spacing: 0.04em;
}
.qr-box {
  display: inline-block; margin-top: 18px; padding: 14px;
  background: #fff; border-radius: 4px;
  color: #9aa4af; font-size: 12px; width: 130px; height: 130px; line-height: 1.7;
  border: 1px solid var(--tech-cyan);
  animation: qr-breath 6s infinite ease-in-out;
}
@keyframes qr-breath {
  0%, 100% { box-shadow: 0 0 8px rgba(0, 228, 255, 0.1); }
  50% { box-shadow: 0 0 22px rgba(0, 228, 255, 0.35); }
}
.contact-region { margin-top: 14px; }

/* ============ 页脚 ============ */
footer.site {
  background: var(--bg-black); color: var(--text-dark-grey); text-align: center;
  padding: 26px 0; font-size: 13px; border-top: 1px solid var(--metal-border);
}
footer.site a { color: var(--text-dark-grey); text-decoration: none; }
footer.site a:hover { color: var(--tech-cyan); }

/* ============ 滚动进场（FAQ 等辅助） ============ */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.45s var(--ease-tech), transform 0.45s var(--ease-tech); }
.reveal.in { opacity: 1; transform: none; }

/* ============ 移动端降级：去重特效，保留入场 ============ */
@media (max-width: 860px) {
  header.site .wrap { flex-direction: column; align-items: flex-start; gap: 10px; }
  nav.main { display: block; }
  nav.main a { margin-left: 0; margin-right: 18px; font-size: 14px; }
  section { padding: 68px 0; }
  /* 立体景深卡移动端：纵向堆叠，粒子/连线关闭 */
  .service-stage { flex-direction: column; gap: 1.5rem; }
  .service-card-item,
  .service-card-item:nth-child(1),
  .service-card-item:nth-child(2),
  .service-card-item:nth-child(3) { transform: none; opacity: 1; width: 100%; max-width: 360px; }
  .particle-field { display: none; }
  .pulse-line { display: none; }
  .service-card-item::before, .service-card-item::after { animation: none; }
  .flow-line-wrap { flex-direction: column; align-items: stretch; gap: 22px; }
  .flow-line { display: none; }
  .flow-item { display: flex; text-align: left; gap: 16px; align-items: flex-start; }
  .flow-node { margin: 8px 0 0; flex-shrink: 0; }
  .dash-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .scroll-hint { display: none; }
  .dash-scan { display: none; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 30px; }
  .hero-btns { flex-direction: column; }
  .tech-btn-primary, .tech-btn-default { width: 100%; text-align: center; }
}

/* ============ 无障碍：尊重减少动效 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-title .t-ch { opacity: 1 !important; transform: none !important; }
  .page-scan-line, .progress, .dash-scan { display: none; }
  .text-scan::after { animation: none; }
  .breath-light { animation: none; }
  .qr-box { animation: none; }
  .scroll-hint span::after { animation: none; }
  .live, .rec i { animation: none; }
  .split .ch { transform: none; transition: none; }
}