/* 智猎宣传页 · 纯静态零依赖 · 移动优先 */
:root {
  --bg: #F7F9FC;
  --bg-tint: #F1F6FE;
  --card: #FFFFFF;
  --ink: #0F172A;
  --ink-2: #475569;
  --ink-3: #64748B;
  --line: #E4EBF5;
  --blue: #2563EB;
  --cyan: #06B6D4;
  --purple: #8B5CF6;
  --green: #10B981;
  --amber: #F59E0B;
  --grad: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);
  --grad-soft: linear-gradient(135deg, rgba(37, 99, 235, .1), rgba(6, 182, 212, .1));
  --shadow: 0 2px 8px rgba(15, 23, 42, .04), 0 18px 44px rgba(37, 99, 235, .08);
  --shadow-strong: 0 4px 14px rgba(15, 23, 42, .06), 0 30px 70px rgba(37, 99, 235, .16);
  --radius: 22px;
  --radius-sm: 14px;
  --max: 1160px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  font-family: "Plus Jakarta Sans", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", Inter, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, video, svg { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
ul, ol { list-style: none; }
code {
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  font-size: .88em;
  background: #EEF4FE;
  color: #1D4ED8;
  padding: 2px 6px;
  border-radius: 6px;
  overflow-wrap: anywhere;
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: 820px; }
.section { padding: 78px 0; position: relative; }
.section--tint { background: linear-gradient(180deg, #F1F6FE 0%, var(--bg) 100%); }
.section__head { max-width: 720px; margin: 0 auto 46px; text-align: center; }
.section__eyebrow {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-size: 14px; font-weight: 600; letter-spacing: .05em;
  color: #2563EB; margin-bottom: 16px;
}
.section__eyebrow::before, .section__eyebrow::after {
  content: ""; width: 26px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, rgba(37, 99, 235, 0), var(--blue));
}
.section__eyebrow::after { background: linear-gradient(270deg, rgba(37, 99, 235, 0), var(--blue)); }
.section__title { font-size: clamp(28px, 3.8vw, 42px); font-weight: 700; line-height: 1.25; letter-spacing: -.02em; }
.section__sub { color: var(--ink-3); font-size: 17px; margin-top: 12px; }

.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nowrap { white-space: nowrap; }
.pulse {
  width: 8px; height: 8px; border-radius: 50%; background: var(--green); flex: 0 0 auto;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, .55); animation: pulseDot 2.2s ease-out infinite;
}
@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, .55); }
  70% { box-shadow: 0 0 0 9px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  border: 1px solid transparent; border-radius: 999px; font-size: 15.5px; font-weight: 600;
  padding: 14px 26px; transition: transform .2s, box-shadow .2s, background .2s, border-color .2s;
  white-space: nowrap;
}
.btn svg { width: 19px; height: 19px; flex: 0 0 auto; }
.btn:hover { transform: translateY(-2px); }
.btn:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px -10px rgba(37, 99, 235, .9); }
.btn--primary:hover { box-shadow: 0 16px 32px -12px rgba(37, 99, 235, .95); }
.btn--ghost { background: #fff; color: var(--ink); border-color: var(--line); box-shadow: 0 2px 8px rgba(15, 23, 42, .04); }
.btn--ghost:hover { border-color: #C7D8F5; color: var(--blue); }
.btn--light { background: #fff; color: #0B1B33; box-shadow: 0 14px 30px -12px rgba(0, 0, 0, .45); }
.btn--outline-light { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .35); }
.btn--outline-light:hover { background: rgba(255, 255, 255, .08); }
.btn--sm { padding: 9px 18px; font-size: 13.5px; }
.text-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 15px; margin-top: 20px; }
.text-link span { transition: transform .2s; }
.text-link:hover span { transform: translateX(4px); }

/* 顶部进度条 */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0; z-index: 120;
  background: linear-gradient(90deg, #2563EB, #06B6D4, #8B5CF6);
  box-shadow: 0 0 10px rgba(37, 99, 235, .4);
}

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247, 249, 252, .82); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(247, 249, 252, .94); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav__brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; }
.nav__logo {
  width: 34px; height: 34px; border-radius: 10px; background: var(--grad); color: #fff;
  display: grid; place-items: center; font-size: 16px; box-shadow: 0 8px 18px -8px rgba(37, 99, 235, .9);
}
.nav__name { font-size: 18px; letter-spacing: .02em; }
.nav__tag { font-size: 11.5px; color: var(--ink-3); background: #EAF0FA; border-radius: 999px; padding: 3px 9px; font-weight: 600; }
.nav__links { display: none; align-items: center; gap: 24px; }
.nav__links a { color: var(--ink-2); font-size: 14.5px; font-weight: 500; position: relative; padding: 5px 0; border-radius: 6px; }
.nav__links a:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
.nav__links a.active { color: var(--blue); }
.nav__links a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; border-radius: 2px; background: var(--blue); }
.nav__links a.nav__cta {
  color: #fff; background: var(--grad); padding: 9px 20px; border-radius: 999px;
  box-shadow: 0 8px 18px -8px rgba(37, 99, 235, .9);
}
.nav__links a.nav__cta.active::after { display: none; }
.nav__toggle { background: none; border: 0; width: 42px; height: 42px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.nav__toggle span { width: 21px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s, opacity .3s; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 58px 0 54px; }
.hero__bg { position: absolute; inset: 0; pointer-events: none; }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(37, 99, 235, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, .055) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 75% 62% at 50% 30%, #000 0%, transparent 76%);
  mask-image: radial-gradient(ellipse 75% 62% at 50% 30%, #000 0%, transparent 76%);
  animation: gridDrift 28s linear infinite;
}
@keyframes gridDrift { to { background-position: 46px 46px, 46px 46px; } }
.hero__blob { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .16; }
.hero__blob--1 { width: 460px; height: 460px; background: #2563EB; top: -160px; right: -120px; animation: blob1 18s ease-in-out infinite; }
.hero__blob--2 { width: 340px; height: 340px; background: #8B5CF6; bottom: -180px; left: -120px; animation: blob2 22s ease-in-out infinite; }
.hero__blob--3 { width: 260px; height: 260px; background: #06B6D4; top: 34%; left: 46%; opacity: .1; animation: blob1 26s ease-in-out infinite reverse; }
@keyframes blob1 { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(-26px, 24px, 0); } }
@keyframes blob2 { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(28px, -20px, 0); } }
.hero__inner { position: relative; display: grid; gap: 44px; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 9px; font-size: 13px; font-weight: 600;
  color: var(--ink-2); background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 14px; box-shadow: 0 2px 8px rgba(15, 23, 42, .04);
}
.hero__eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--grad); }
.hero__title { font-size: clamp(34px, 5.2vw, 58px); font-weight: 800; line-height: 1.2; letter-spacing: -.03em; margin-top: 18px; }
.hero__sub { color: var(--ink-2); font-size: clamp(16.5px, 1.9vw, 18.5px); margin: 18px 0 26px; max-width: 34em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero__note { color: var(--ink-3); font-size: 13.5px; margin-top: 16px; }
.hero__stats { display: flex; gap: 14px; margin-top: 30px; }
.stat {
  flex: 1 1 0; background: rgba(255, 255, 255, .72); border: 1px solid var(--line); border-radius: 16px;
  padding: 14px 16px; backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.stat__num {
  font-size: clamp(26px, 3vw, 36px); font-weight: 800; line-height: 1.1; font-variant-numeric: tabular-nums;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat__label { font-size: 12.5px; color: var(--ink-3); margin-top: 2px; }

.hero__art { position: relative; }
.browser {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: 18px;
  box-shadow: var(--shadow-strong); overflow: hidden; transform: perspective(1200px) rotateX(1.5deg);
  transition: transform .5s ease, box-shadow .5s ease;
}
.browser:hover { transform: perspective(1200px) rotateX(0deg) translateY(-4px); }
.browser__bar {
  display: flex; align-items: center; gap: 12px; height: 44px; padding: 0 14px;
  background: #F3F6FB; border-bottom: 1px solid var(--line);
}
.browser__dots { display: flex; gap: 6px; }
.browser__dots i { width: 10px; height: 10px; border-radius: 50%; background: #D6DFEC; }
.browser__dots i:nth-child(1) { background: #FF6B6B; }
.browser__dots i:nth-child(2) { background: #FFC94D; }
.browser__dots i:nth-child(3) { background: #35C46A; }
.browser__url {
  flex: 1; min-width: 0; font-size: 12px; color: var(--ink-3); background: #fff;
  border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.browser__live { display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; color: #047857; background: #ECFDF5; border-radius: 999px; padding: 3px 9px; white-space: nowrap; }
.browser__body { position: relative; overflow: hidden; background: #fff; }
.browser__body img { width: 100%; height: auto; }
.scanline {
  position: absolute; left: 0; right: 0; top: -30%; height: 30%;
  background: linear-gradient(180deg, transparent, rgba(37, 99, 235, .09), transparent);
  animation: scan 6s ease-in-out infinite; pointer-events: none;
}
@keyframes scan { 0% { top: -30%; } 55%, 100% { top: 100%; } }
.hero__caption { text-align: center; color: var(--ink-3); font-size: 12.5px; margin-top: 14px; }
.float-chip {
  position: absolute; z-index: 2; display: inline-flex; align-items: center; gap: 7px;
  background: rgba(255, 255, 255, .92); border: 1px solid var(--line); border-radius: 999px;
  box-shadow: 0 12px 28px -12px rgba(15, 23, 42, .28); padding: 8px 14px;
  font-size: 12.5px; font-weight: 600; color: var(--ink-2); white-space: nowrap;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.float-chip--1 { top: 54px; left: -12px; animation: floatA 5.5s ease-in-out infinite; }
.float-chip--2 { bottom: 74px; right: -10px; animation: floatB 6.5s ease-in-out infinite; }
.float-chip--3 { bottom: 18px; left: 18px; animation: floatA 7.5s ease-in-out infinite reverse; }
@keyframes floatA { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes floatB { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(9px); } }

/* 跑马灯 */
.marquee { padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; overflow: hidden; }
.marquee__row { position: relative; }
.marquee__row::before, .marquee__row::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 90px; z-index: 2; pointer-events: none;
}
.marquee__row::before { left: 0; background: linear-gradient(90deg, #fff, rgba(255, 255, 255, 0)); }
.marquee__row::after { right: 0; background: linear-gradient(270deg, #fff, rgba(255, 255, 255, 0)); }
.marquee__track { display: flex; width: max-content; animation: marquee 34s linear infinite; }
.marquee:hover .marquee__track { animation-play-state: paused; }
.marquee__group { display: flex; align-items: center; gap: 34px; padding-right: 34px; }
.marquee__group span { font-size: 17px; font-weight: 700; color: #98A6BC; white-space: nowrap; letter-spacing: .02em; }
.marquee__group i { width: 4px; height: 4px; border-radius: 50%; background: #CBD5E5; }
@keyframes marquee { to { transform: translateX(-16.6667%); } }

/* 简介 */
.intro__grid { display: grid; gap: 34px; }
.intro__copy h3 { font-size: clamp(22px, 2.6vw, 30px); line-height: 1.4; letter-spacing: -.02em; }
.intro__copy p { color: var(--ink-2); margin-top: 14px; }
.steps { display: grid; gap: 14px; }
.step {
  position: relative; display: flex; gap: 16px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px;
  box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s, border-color .25s;
}
.step:hover { transform: translateY(-2px); box-shadow: var(--shadow-strong); border-color: #CBD9F6; }
.step__no {
  flex: 0 0 42px; width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center;
  background: var(--grad-soft); color: var(--blue); font-weight: 800; font-size: 14px;
}
.step h4 { font-size: 18px; }
.step p { color: var(--ink-3); font-size: 14.5px; margin-top: 2px; }

/* 卡片网格 */
.grid { display: grid; gap: 18px; }
.card {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-strong); border-color: #CBD9F6; }
.card h3 { font-size: 18.5px; margin-top: 16px; }
.card p { color: var(--ink-3); font-size: 14.8px; margin-top: 8px; }
.icon { width: 48px; height: 48px; border-radius: 15px; display: grid; place-items: center; color: #fff; }
.icon svg { width: 24px; height: 24px; }
.icon--blue { background: linear-gradient(135deg, #2563EB, #06B6D4); box-shadow: 0 10px 20px -10px rgba(37, 99, 235, .9); }
.icon--cyan { background: linear-gradient(135deg, #06B6D4, #10B981); box-shadow: 0 10px 20px -10px rgba(6, 182, 212, .9); }
.icon--purple { background: linear-gradient(135deg, #8B5CF6, #2563EB); box-shadow: 0 10px 20px -10px rgba(139, 92, 246, .9); }
.icon--green { background: linear-gradient(135deg, #10B981, #06B6D4); box-shadow: 0 10px 20px -10px rgba(16, 185, 129, .9); }
.icon--amber { background: linear-gradient(135deg, #F59E0B, #EF4444); box-shadow: 0 10px 20px -10px rgba(245, 158, 11, .9); }
.icon--slate { background: linear-gradient(135deg, #475569, #2563EB); box-shadow: 0 10px 20px -10px rgba(71, 85, 105, .9); }

/* 优势卡 */
.adv {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow); overflow: hidden;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.adv:hover { transform: translateY(-3px); box-shadow: var(--shadow-strong); border-color: #CBD9F6; }
.adv h3 { font-size: 18px; margin-top: 16px; }
.adv p { color: var(--ink-3); font-size: 14.6px; margin-top: 8px; }

/* 界面截图 */
.shots { display: grid; gap: 18px; }
.shots__main {
  position: relative; display: block; width: 100%; padding: 0; border: 1px solid var(--line);
  border-radius: 20px; overflow: hidden; background: #fff; box-shadow: var(--shadow-strong);
  transition: transform .3s, box-shadow .3s;
}
.shots__main:hover { transform: translateY(-3px); }
.shots__main:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.shots__main img { width: 100%; height: auto; }
.shots__zoom {
  position: absolute; top: 14px; right: 14px; font-size: 12px; font-weight: 600; color: var(--ink-2);
  background: rgba(255, 255, 255, .92); border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px;
  box-shadow: 0 4px 12px rgba(15, 23, 42, .08);
}
.shots__caption {
  position: absolute; left: 0; right: 0; bottom: 0; text-align: left;
  font-size: 13px; color: #fff; background: linear-gradient(0deg, rgba(8, 15, 30, .78), rgba(8, 15, 30, 0));
  padding: 28px 18px 12px;
}
.shots__thumbs { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.shot-thumb {
  display: flex; flex-direction: column; gap: 7px; padding: 8px; background: #fff;
  border: 1px solid var(--line); border-radius: 13px; transition: border-color .2s, box-shadow .2s, transform .2s;
}
.shot-thumb img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top left; border-radius: 8px; }
.shot-thumb span { font-size: 12.5px; color: var(--ink-3); font-weight: 600; text-align: center; }
.shot-thumb:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.shot-thumb.is-active { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }
.shot-thumb.is-active span { color: var(--blue); }
.shot-thumb:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

/* 视频 */
.videos { display: grid; gap: 18px; }
.video-card {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s, border-color .25s;
}
.video-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-strong); border-color: #CBD9F6; }
.video-card__head { position: relative; padding-right: 62px; margin-bottom: 14px; }
.video-card__head h3 { font-size: 18px; }
.video-card__head p { color: var(--ink-3); font-size: 13.5px; }
.video-card__badge {
  position: absolute; top: 0; right: 0; display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 600; color: #047857; background: #ECFDF5; border-radius: 999px; padding: 4px 9px;
}
.video-card__box { position: relative; border-radius: 14px; overflow: hidden; background: #0B1220; }
.video-card__box video { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.video-card__fallback {
  position: absolute; inset: 0; display: flex; flex-direction: column; gap: 10px;
  align-items: center; justify-content: center; background: rgba(11, 18, 32, .88); color: #E2E8F0; font-size: 13.5px;
}
.video-card__fallback[hidden] { display: none; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 13px; }
.tag {
  font-size: 12px; color: var(--blue); background: #EAF1FD; border: 1px solid transparent;
  border-radius: 999px; padding: 4px 11px; transition: background .2s, color .2s;
}
.tag:hover { background: var(--blue); color: #fff; }

/* 功能列表 */
.features { display: grid; gap: 14px; }
.feature {
  position: relative; display: flex; gap: 18px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 22px 24px;
  box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s, border-color .25s;
}
.feature:hover { transform: translateY(-2px); box-shadow: var(--shadow-strong); border-color: #CBD9F6; }
.feature__no { flex: 0 0 40px; font-size: 13px; font-weight: 800; color: #B6C4DA; letter-spacing: .04em; padding-top: 3px; }
.feature__body { flex: 1; min-width: 0; }
.feature__body h3 { font-size: 18.5px; }
.feature__body p { color: var(--ink-3); font-size: 14.8px; margin-top: 5px; }
.feature__icon { flex: 0 0 42px; width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--grad-soft); color: var(--blue); }
.feature__icon svg { width: 21px; height: 21px; }

/* 使用说明 */
.guide { display: grid; gap: 30px; }
.guide__steps { display: grid; gap: 10px; }
.guide-step {
  position: relative; display: flex; gap: 16px; padding: 18px 20px 18px 0;
  border-bottom: 1px dashed var(--line);
}
.guide-step:last-child { border-bottom: 0; }
.guide-step__no {
  flex: 0 0 34px; width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-weight: 700; font-size: 14px;
  box-shadow: 0 8px 16px -8px rgba(37, 99, 235, .9);
}
.guide-step h3 { font-size: 17.5px; }
.guide-step p { color: var(--ink-2); font-size: 14.6px; margin-top: 4px; }
.guide-step__tip { color: var(--ink-3) !important; font-size: 13.2px !important; }
.guide-step__tip::before { content: "提示："; color: var(--blue); font-weight: 600; }
.guide__media { display: grid; gap: 16px; align-content: start; }
.guide-shot { background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); }
.guide-shot img { width: 100%; height: auto; }
.guide-shot figcaption { font-size: 12.5px; color: var(--ink-3); padding: 10px 14px; border-top: 1px solid var(--line); }

.req { margin-top: 42px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; box-shadow: var(--shadow); }
.req h3 { font-size: 19px; margin-bottom: 12px; }
.req__table { width: 100%; border-collapse: collapse; }
.req__table th, .req__table td { text-align: left; font-size: 14.5px; padding: 11px 4px; border-bottom: 1px dashed var(--line); vertical-align: top; }
.req__table th { width: 108px; color: var(--ink-3); font-weight: 600; white-space: nowrap; }
.req__table td { color: var(--ink-2); }
.req__table tr:last-child th, .req__table tr:last-child td { border-bottom: 0; }

/* 下载 */
.download { padding: 44px 0 78px; }
.download__panel {
  position: relative; overflow: hidden; display: grid; gap: 28px;
  background: radial-gradient(120% 140% at 85% 0%, #1B3A6B 0%, #0B1220 55%, #080E1A 100%);
  border-radius: 30px; padding: 40px 26px; color: #fff;
  box-shadow: 0 30px 80px -30px rgba(11, 18, 32, .7);
}
.download__glow {
  position: absolute; width: 420px; height: 420px; border-radius: 50%; right: -120px; top: -160px;
  background: radial-gradient(circle, rgba(6, 182, 212, .35), transparent 65%);
  filter: blur(20px); pointer-events: none;
}
.download__eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .08em; color: #7DD3FC; }
.download__text h2 { font-size: clamp(27px, 3.4vw, 38px); line-height: 1.25; margin-top: 8px; letter-spacing: -.02em; }
.download__text > p { color: #C7D5E8; margin-top: 12px; max-width: 46em; }
.download__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.download__meta { font-size: 13px; color: #93A6C0; margin-top: 14px; }
.download__side { display: grid; gap: 12px; align-content: start; }
.download__card { background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .14); border-radius: 18px; padding: 18px; }
.download__card-label { font-size: 12px; color: #93A6C0; }
.download__file { font-size: 15px; font-weight: 600; margin-top: 2px; }
.dl-list { display: grid; gap: 8px; margin-top: 12px; }
.dl-list li {
  display: flex; justify-content: space-between; align-items: baseline; gap: 14px;
  font-size: 12.5px; color: #93A6C0; padding-top: 8px; border-top: 1px solid rgba(255, 255, 255, .08);
}
.dl-list li:first-child { border-top: 0; padding-top: 0; }
.dl-list b { color: #E2E8F0; font-weight: 600; text-align: right; }
.hash-details { margin-top: 14px; padding-top: 10px; border-top: 1px solid rgba(255, 255, 255, .1); }
.hash-details summary {
  display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: #93A6C0;
  cursor: pointer; list-style: none; transition: color .2s;
}
.hash-details summary::-webkit-details-marker { display: none; }
.hash-details summary::before { content: "▸"; font-size: 10px; color: #7E93AE; transition: transform .2s; }
.hash-details[open] summary::before { transform: rotate(90deg); }
.hash-details summary:hover { color: #CBD5E1; }
.hash { display: flex; gap: 8px; align-items: center; margin-top: 10px; }
.hash code {
  flex: 1; min-width: 0; font-size: 10.5px; line-height: 1.6; color: #BAE6FD;
  background: rgba(2, 12, 27, .55); border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 8px; padding: 7px 9px; word-break: break-all;
}
.hash__copy {
  flex: 0 0 auto; border: 1px solid rgba(255, 255, 255, .2); background: rgba(255, 255, 255, .08);
  color: #E2E8F0; font-size: 12px; border-radius: 8px; padding: 7px 10px; transition: background .2s;
}
.hash__copy:hover { background: rgba(255, 255, 255, .16); }
.download__hint { font-size: 11.5px; color: #7E93AE; margin-top: 7px; }
.download__mac { font-size: 12.5px; color: #93A6C0; }

/* FAQ */
.faq { display: grid; }
.faq__item { border-bottom: 1px solid var(--line); }
.faq__item summary {
  position: relative; list-style: none; cursor: pointer; padding: 19px 42px 19px 0;
  font-size: 16.5px; font-weight: 600; transition: color .2s;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+"; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 400; color: var(--ink-3); transition: transform .25s, color .25s;
}
.faq__item[open] summary { color: var(--blue); }
.faq__item[open] summary::after { content: "−"; color: var(--blue); }
.faq__item p { color: var(--ink-2); font-size: 15px; padding: 0 30px 20px 0; }
.faq__item summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 6px; }

/* 页脚 */
.footer { border-top: 1px solid var(--line); background: #fff; padding: 34px 0 96px; }
.footer__inner { display: flex; flex-direction: column; gap: 22px; }
.footer__brand { display: flex; gap: 12px; align-items: flex-start; }
.footer__name { font-weight: 700; font-size: 16px; }
.footer__desc { color: var(--ink-3); font-size: 13.5px; }
.footer__meta { color: var(--ink-3); font-size: 13px; }
.footer__meta p + p { margin-top: 4px; }
.footer__badge { display: inline-block; margin-top: 8px; font-size: 11.5px; color: var(--blue); background: #EAF1FD; border-radius: 999px; padding: 4px 10px; }
.footer__copy { margin-top: 8px; }

/* 悬浮下载 */
.fab {
  position: fixed; right: 16px; bottom: 22px; z-index: 90;
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--grad); color: #fff; font-size: 14px; font-weight: 600;
  padding: 12px 18px; border-radius: 999px; box-shadow: 0 12px 28px -8px rgba(37, 99, 235, .65);
  opacity: 0; transform: translateY(10px); pointer-events: none; transition: opacity .3s, transform .3s;
}
.fab svg { width: 17px; height: 17px; }
.fab.show { opacity: 1; transform: none; pointer-events: auto; }
.fab:hover { transform: translateY(-2px); }

/* 图片放大 */
.lightbox { position: fixed; inset: 0; z-index: 150; background: rgba(8, 15, 30, .78); display: flex; align-items: center; justify-content: center; padding: 20px; backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.lightbox[hidden] { display: none; }
.lightbox__box { background: #fff; border-radius: 18px; overflow: hidden; max-width: 1180px; width: 100%; max-height: calc(100vh - 40px); display: flex; flex-direction: column; }
.lightbox__box img { width: 100%; height: auto; max-height: calc(100vh - 130px); object-fit: contain; background: #F3F6FB; }
.lightbox__bar { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 12px 16px; border-top: 1px solid var(--line); }
.lightbox__bar p { font-size: 13px; color: var(--ink-3); }

/* 动效 */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease-out, transform .6s ease-out; }
.reveal.in { opacity: 1; transform: none; }
.reveal--stagger { transition-delay: calc(var(--i, 0) * 80ms); }
/* 首屏入场改为纯 CSS：不等 JS，避免慢连接时白屏 */
@keyframes heroIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.hero .reveal { opacity: 1; transform: none; animation: heroIn .62s cubic-bezier(.22, .61, .36, 1) both; }
.hero__sub.reveal { animation-delay: .05s; }
.hero__actions.reveal { animation-delay: .1s; }
.hero__note.reveal { animation-delay: .14s; }
.hero__stats.reveal { animation-delay: .18s; }
.hero__art.reveal { animation-delay: .1s; }
.glow-card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; z-index: 0;
  background: radial-gradient(260px circle at var(--mx, 50%) var(--my, 0%), rgba(37, 99, 235, .1), rgba(37, 99, 235, 0) 66%);
  opacity: 0; transition: opacity .3s;
}
.glow-card:hover::before { opacity: 1; }
.glow-card > * { position: relative; z-index: 1; }

/* 平板 */
@media (min-width: 640px) {
  .grid--4 { grid-template-columns: 1fr 1fr; }
  .videos { grid-template-columns: 1fr 1fr; }
  .features { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 768px) {
  .section { padding: 92px 0; }
  .hero { padding: 72px 0 66px; }
  .grid--3 { grid-template-columns: 1fr 1fr; }
  .intro__grid { grid-template-columns: 1.05fr .95fr; align-items: center; gap: 46px; }
  .guide { grid-template-columns: 1.05fr .95fr; gap: 40px; }
  .guide__media { position: sticky; top: 88px; }
  .download__panel { padding: 48px 42px; grid-template-columns: 1.25fr .75fr; align-items: center; }
  .footer__inner { flex-direction: row; justify-content: space-between; align-items: flex-start; }
  .footer__meta { text-align: right; }
  .shots__main img { max-height: 620px; object-fit: cover; object-position: top left; }
}
@media (min-width: 900px) {
  .nav__links { display: flex; }
  .nav__toggle { display: none; }
}
@media (min-width: 1024px) {
  .hero__inner { grid-template-columns: 1.02fr .98fr; align-items: center; gap: 54px; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
  .videos { grid-template-columns: repeat(3, 1fr); }
  .videos { gap: 20px; }
  .download { padding: 20px 0 96px; }
  .download__panel { padding: 58px 54px; }
}

/* 减少动效 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .marquee__track { animation: none !important; }
  .glow-card::before { display: none; }
  .scanline { display: none; }
  .float-chip { animation: none !important; }
}

/* 移动端导航抽屉 */
@media (max-width: 899px) {
  .nav__links.open {
    display: flex; position: fixed; top: 64px; left: 0; right: 0;
    height: calc(100vh - 64px); height: calc(100dvh - 64px);
    overflow-y: auto; background: var(--bg); flex-direction: column;
    align-items: center; justify-content: flex-start; padding-top: 44px; gap: 22px; z-index: 95;
  }
  .nav__links.open a { font-size: 18px; }
  .nav__links.open a.nav__cta { font-size: 16px; margin-top: 8px; }
  .hero__stats { gap: 10px; }
  .stat { padding: 12px; }
  .float-chip { font-size: 11.5px; padding: 6px 11px; }
  .float-chip--1 { left: -4px; }
  .float-chip--2 { right: -2px; }
  .shots__thumbs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shots__thumbs .shot-thumb:last-child:nth-child(odd) { grid-column: 1 / -1; }
}

/* ============ 登录/注册 + 下载门禁（后端集成增量） ============ */
.nav__login {
  font-size: 15.5px;
  color: var(--ink-2);
  font-weight: 500;
}
.nav__login:hover { color: var(--blue); }

.auth-modal {
  position: fixed; inset: 0; z-index: 240;
  display: flex; align-items: center; justify-content: center; padding: 20px;
  background: rgba(15, 23, 42, .45);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  opacity: 0; pointer-events: none; transition: opacity .2s ease;
}
.auth-modal.open { opacity: 1; pointer-events: auto; }

.auth-modal__box {
  position: relative;
  width: min(400px, 100%);
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-strong);
  padding: 36px 32px 30px;
  transform: translateY(14px) scale(.98);
  transition: transform .2s ease;
}
.auth-modal.open .auth-modal__box { transform: none; }

.auth-modal__close {
  position: absolute; top: 14px; right: 16px;
  width: 34px; height: 34px; border: none; border-radius: 10px;
  background: transparent; color: var(--ink-3); font-size: 20px; line-height: 1;
}
.auth-modal__close:hover { background: var(--bg-tint); color: var(--ink); }

.auth-title { font-size: 22px; font-weight: 800; letter-spacing: -.01em; }
.auth-sub { font-size: 14px; color: var(--ink-3); margin: 6px 0 20px; }

.auth-field { margin-bottom: 14px; }
.auth-field label {
  display: block; font-size: 13px; font-weight: 600;
  color: var(--ink-2); margin-bottom: 6px;
}
.auth-input {
  width: 100%; height: 46px;
  border: 1.5px solid var(--line); border-radius: 12px;
  padding: 0 14px; font-size: 15.5px; font-family: inherit;
  background: #FBFDFF; color: var(--ink);
  transition: border-color .15s, box-shadow .15s;
}
.auth-input:focus {
  outline: none; border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}
.auth-field--extra { display: none; }
.auth-field--extra.show { display: block; }

.auth-error {
  display: none; font-size: 13.5px; color: #DC2626;
  background: #FEF2F2; border: 1px solid #FECACA;
  border-radius: 10px; padding: 8px 12px; margin-bottom: 14px;
}
.auth-error.show { display: block; }

.auth-submit {
  width: 100%; height: 48px; margin-top: 4px;
  border: none; border-radius: 12px;
  background: var(--grad); color: #fff;
  font-size: 16px; font-weight: 700; font-family: inherit;
}
.auth-submit:hover { filter: brightness(1.06); }
.auth-submit:disabled { opacity: .6; cursor: wait; }

.auth-switch {
  font-size: 13.5px; color: var(--ink-3);
  text-align: center; margin-top: 16px;
}
.auth-switch button {
  border: none; background: none; padding: 0;
  color: var(--blue); font-size: 13.5px; font-weight: 600; font-family: inherit;
}
.auth-switch button:hover { text-decoration: underline; }

.auth-note {
  font-size: 12.5px; color: var(--ink-3);
  text-align: center; margin-top: 14px;
}