/* ============================================================
   星火AI 官网 V2.0 视觉系统
   定位：AI科技 × 商业品牌 × 高级极简
   配比：70% 白/留白 · 20% 深色品牌区 · 10% 星火橙
   ============================================================ */

:root {
  --navy-950: #071120;
  --navy-900: #0a1628;
  --navy-800: #12233c;
  --navy-700: #1c3454;
  --ink: #0f1723;
  --ink-2: #3d4759;
  --ink-3: #6b7488;
  --line: #e9e9e6;
  --line-dark: rgba(255, 255, 255, 0.1);
  --white: #ffffff;
  --bg-warm: #fafaf8;
  --accent: #ff5a2d;
  --accent-soft: #fff2ed;
  --accent-dark: #e0441c;
  --electric: #2e6bff;

  --font: "HarmonyOS Sans SC", "Noto Sans SC", "Source Han Sans SC",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;

  --max: 1200px;
  --radius: 18px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 28px; }

/* ---------------- 通用区块 ---------------- */
.section { padding: 132px 0; }
.section.tight { padding: 104px 0; }
.section.warm { background: var(--bg-warm); }
.section.dark { background: var(--navy-900); color: var(--white); }

.sec-head { max-width: 720px; margin-bottom: 68px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-label {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; font-weight: 700; letter-spacing: 2.4px;
  color: var(--accent); text-transform: uppercase; margin-bottom: 20px;
}
.sec-label::before { content: ""; width: 18px; height: 1px; background: var(--accent); }
.section.dark .sec-label { color: var(--accent); }

.sec-head h2 {
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.24; font-weight: 800; letter-spacing: -0.4px;
}
.section.dark .sec-head h2 { color: var(--white); }
.sec-head p {
  margin-top: 22px; font-size: 17px; line-height: 1.8; color: var(--ink-3);
}
.section.dark .sec-head p { color: rgba(255, 255, 255, 0.62); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 16px 34px; border-radius: 999px;
  font-size: 15px; font-weight: 700; letter-spacing: 0.2px;
  transition: all 0.28s var(--ease); white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; transition: transform 0.28s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }

.btn-dark { background: var(--navy-900); color: #fff; }
.btn-dark:hover { background: var(--navy-800); transform: translateY(-2px); }

.btn-ghost { border: 1.5px solid var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--ink); }

.on-dark .btn-ghost, .section.dark .btn-ghost {
  border-color: rgba(255, 255, 255, 0.28); color: #fff; background: transparent;
}
.section.dark .btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,0.06); }

.btn-sm { padding: 11px 22px; font-size: 13.5px; }
.btn-block { width: 100%; }

/* ---------------- 导航 ---------------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: all 0.32s var(--ease);
}
.nav.scrolled { background: rgba(255, 255, 255, 0.94); border-bottom-color: var(--line); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 78px; transition: height 0.32s var(--ease);
}
.nav.scrolled .nav-inner { height: 64px; }

.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px; flex-shrink: 0;
  overflow: hidden; background: var(--navy-900);
  display: flex; align-items: center; justify-content: center;
}
.brand-mark img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand-mark svg { width: 16px; height: 16px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-cn { font-size: 16.5px; font-weight: 800; letter-spacing: 0.6px; }
.brand-en {
  font-size: 9.5px; letter-spacing: 2.2px; color: var(--ink-3); font-weight: 600;
}

.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a {
  font-size: 14.5px; font-weight: 500; color: var(--ink-2);
  transition: color 0.2s; position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -7px;
  height: 1.5px; background: var(--accent); transition: right 0.28s var(--ease);
}
.nav-links a:hover::after { right: 0; }
.nav-right { display: flex; align-items: center; gap: 14px; }

.burger {
  display: none; width: 42px; height: 42px; border-radius: 10px;
  align-items: center; justify-content: center; flex-direction: column; gap: 5px;
}
.burger span {
  display: block; width: 19px; height: 1.6px; background: var(--ink);
  transition: all 0.28s var(--ease);
}
.burger.open span:nth-child(1) { transform: translateY(6.6px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-6.6px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 0; z-index: 195;
  background: var(--navy-950);
  padding: 108px 32px 40px;
  display: flex; flex-direction: column; gap: 4px;
  overflow-y: auto;
  opacity: 0; pointer-events: none; transition: opacity 0.3s var(--ease);
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  color: rgba(255, 255, 255, 0.86); font-size: 21px; font-weight: 600;
  padding: 16px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.mobile-menu .mm-cta { margin-top: 28px; }
.mobile-menu .btn { width: 100%; }

@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-right .nav-cta { display: none; }
  .burger { display: flex; }
}

/* ---------------- 01 HERO ---------------- */
.hero {
  position: relative; overflow: hidden;
  padding: 176px 0 128px;
  background: var(--white);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(720px 420px at 88% 6%, rgba(255, 90, 45, 0.07), transparent 62%),
    radial-gradient(560px 360px at 4% 96%, rgba(10, 22, 40, 0.045), transparent 60%);
  pointer-events: none;
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 1.08fr 0.92fr;
  gap: 76px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 16px 7px 12px; margin-bottom: 34px;
  font-size: 12px; font-weight: 700; letter-spacing: 1.4px; color: var(--ink-2);
}
.hero-badge .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 90, 45, 0.16);
}
.hero h1 {
  font-size: clamp(38px, 4.6vw, 62px);
  line-height: 1.16; font-weight: 800; letter-spacing: -1.4px;
}
.hero h1 .hl { color: var(--accent); }
.hero .lead {
  margin-top: 28px; font-size: 17.5px; line-height: 1.85;
  color: var(--ink-2); max-width: 540px;
}
.hero .lead strong { color: var(--ink); font-weight: 600; }
.hero-cta { display: flex; gap: 14px; margin-top: 44px; flex-wrap: wrap; }
.hero-note {
  margin-top: 40px; padding-top: 26px; border-top: 1px solid var(--line);
  display: flex; gap: 26px; flex-wrap: wrap;
  font-size: 13.5px; color: var(--ink-3);
}
.hero-note span { display: flex; align-items: center; gap: 8px; }
.hero-note i {
  width: 5px; height: 5px; border-radius: 50%; background: var(--accent);
  display: inline-block; font-style: normal;
}

/* HERO 视觉：星火AI商业增长引擎 */
.engine {
  background: var(--navy-900); border-radius: 24px;
  padding: 34px 32px 30px; position: relative; overflow: hidden;
  box-shadow: 0 32px 70px -30px rgba(10, 22, 40, 0.55);
}
.engine::after {
  content: ""; position: absolute; width: 320px; height: 320px;
  right: -120px; top: -140px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 90, 45, 0.22), transparent 68%);
}
.engine-head {
  position: relative; display: flex; align-items: baseline; justify-content: space-between;
  padding-bottom: 22px; border-bottom: 1px solid var(--line-dark); margin-bottom: 22px;
}
.engine-head h3 { font-size: 14.5px; font-weight: 700; color: #fff; letter-spacing: 0.4px; }
.engine-head span { font-size: 10.5px; letter-spacing: 2px; color: rgba(255,255,255,0.34); font-weight: 600; }

.engine-flow { position: relative; }
.flow-step {
  display: flex; align-items: center; gap: 14px;
  padding: 11px 0; position: relative;
}
.flow-step .idx {
  width: 26px; height: 26px; border-radius: 8px; flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.16);
  display: flex; align-items: center; justify-content: center;
  font-size: 10.5px; font-weight: 700; color: rgba(255, 255, 255, 0.55);
}
.flow-step .name { font-size: 15px; font-weight: 600; color: rgba(255, 255, 255, 0.9); }
.flow-step .en {
  margin-left: auto; font-size: 10px; letter-spacing: 1.6px;
  color: rgba(255, 255, 255, 0.28); font-weight: 600;
}
.flow-step::before {
  content: ""; position: absolute; left: 13px; top: 0; width: 1px; height: 100%;
  background: rgba(255, 255, 255, 0.1);
}
.flow-step:first-child::before { top: 50%; }
.flow-step:last-child::before { height: 50%; }

.engine-out {
  margin-top: 18px; padding: 18px 20px; border-radius: 14px;
  background: var(--accent); display: flex; align-items: center; justify-content: space-between;
  position: relative;
}
.engine-out .t { font-size: 16.5px; font-weight: 800; color: #fff; letter-spacing: 0.4px; }
.engine-out .s { font-size: 11px; color: rgba(255, 255, 255, 0.72); letter-spacing: 1px; }

@media (max-width: 980px) {
  .hero { padding: 132px 0 88px; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .engine { max-width: 460px; }
}

/* ---------------- 02 你现在处在哪一步 ---------------- */
.stage-grid { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.stage-card {
  background: #fff; padding: 36px 34px; display: grid;
  grid-template-columns: 64px 1fr auto; gap: 26px; align-items: center;
  transition: background 0.28s var(--ease);
}
.stage-card:hover { background: var(--bg-warm); }
.stage-card .no {
  font-size: 13px; font-weight: 800; letter-spacing: 1.6px; color: var(--accent);
}
.stage-card .q { font-size: 19.5px; font-weight: 700; letter-spacing: -0.2px; }
.stage-card .sol {
  margin-top: 9px; font-size: 14.5px; color: var(--ink-3);
  display: flex; align-items: center; gap: 10px;
}
.stage-card .sol b { color: var(--ink-2); font-weight: 600; }
.stage-card .go {
  font-size: 13.5px; font-weight: 700; color: var(--ink-3);
  display: flex; align-items: center; gap: 7px; transition: all 0.28s var(--ease);
}
.stage-card:hover .go { color: var(--accent); gap: 12px; }

@media (max-width: 820px) {
  .stage-card { grid-template-columns: 1fr; gap: 12px; padding: 28px 24px; }
  .stage-card .go { justify-content: flex-start; }
}

/* ---------------- 03 五大业务引擎 ---------------- */
.biz-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.biz-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 30px 30px; background: #fff;
  display: flex; flex-direction: column;
  transition: all 0.32s var(--ease);
}
.biz-card:hover { border-color: var(--navy-900); transform: translateY(-4px); }
.biz-card .no {
  font-size: 12px; font-weight: 800; letter-spacing: 2px; color: var(--accent);
  padding-bottom: 20px; border-bottom: 1px solid var(--line); margin-bottom: 22px;
}
.biz-card h3 { font-size: 20px; font-weight: 800; letter-spacing: -0.2px; }
.biz-card .line {
  margin-top: 14px; font-size: 15px; color: var(--ink-2); font-weight: 500;
  line-height: 1.75;
}
.biz-card .tags { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 7px; }
.biz-card .tags span {
  font-size: 12px; color: var(--ink-3); background: var(--bg-warm);
  border: 1px solid var(--line); border-radius: 6px; padding: 4px 10px;
}
.biz-card.wide { grid-column: span 2; }

.biz-card.wide { grid-column: span 2; }

.biz-grid-2 { grid-template-columns: repeat(2, 1fr); }
.biz-grid-2 .biz-card h3 { font-size: 22px; line-height: 1.45; }
.biz-grid-2 .biz-card { padding: 40px 36px 36px; }

@media (max-width: 980px) {
  .biz-grid { grid-template-columns: 1fr 1fr; }
  .biz-card.wide { grid-column: span 2; }
}
@media (max-width: 660px) {
  .biz-grid, .biz-grid-2 { grid-template-columns: 1fr; }
  .biz-card.wide { grid-column: span 1; }
  .biz-grid-2 .biz-card h3 { font-size: 20px; }
}

/* ---------------- 04 增长引擎闭环 ---------------- */
.loop-wrap { display: flex; justify-content: center; }
.loop-svg { width: 100%; max-width: 900px; height: auto; }
.loop-list { display: none; }

@media (max-width: 760px) {
  .loop-wrap { display: block; }
  .loop-svg { display: none; }
  .loop-list { display: grid; gap: 10px; }
  .loop-list li {
    display: flex; align-items: center; gap: 14px;
    padding: 15px 18px; border-radius: 12px;
    background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line-dark);
    font-size: 15px; font-weight: 600; color: rgba(255, 255, 255, 0.9);
  }
  .loop-list li i {
    font-style: normal; font-size: 11px; font-weight: 800;
    color: var(--accent); letter-spacing: 1px; min-width: 20px;
  }
  .loop-list li:last-child { background: var(--accent); border-color: var(--accent); color: #fff; }
  .loop-list li:last-child i { color: rgba(255, 255, 255, 0.7); }
}

/* ---------------- 05 案例中心 ---------------- */
.chips { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 34px; }
.chip {
  padding: 9px 18px; border-radius: 999px; border: 1px solid var(--line);
  font-size: 13.5px; font-weight: 600; color: var(--ink-2); background: #fff;
  transition: all 0.24s var(--ease);
}
.chip:hover { border-color: var(--ink-3); }
.chip.active { background: var(--navy-900); border-color: var(--navy-900); color: #fff; }

.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 980px) { .case-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .case-grid { grid-template-columns: 1fr; } }

.case-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: #fff; transition: all 0.32s var(--ease);
}
.case-card:hover { transform: translateY(-4px); border-color: var(--navy-900); }
/* 案例封面（电影海报式） */
.case-card { cursor: default; }
.case-thumb {
  aspect-ratio: 16 / 10; background: var(--navy-900);
  position: relative; display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.case-thumb::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 72% 18%, rgba(255, 90, 45, 0.18), transparent 60%),
    radial-gradient(circle at 18% 88%, rgba(46, 107, 255, 0.12), transparent 58%);
}
.poster-no {
  position: absolute; top: 16px; left: 18px;
  font-size: 34px; font-weight: 800; letter-spacing: -1px;
  color: rgba(255, 255, 255, 0.14); line-height: 1;
}
.poster-tag {
  position: absolute; top: 22px; right: 18px;
  font-size: 10.5px; letter-spacing: 1.6px; font-weight: 700;
  color: rgba(255, 255, 255, 0.5);
}
.poster-line {
  position: absolute; left: 18px; right: 18px; bottom: 0; height: 1px;
  background: rgba(255, 255, 255, 0.1);
}
.case-play {
  position: relative; width: 50px; height: 50px; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  display: flex; align-items: center; justify-content: center;
  transition: all 0.3s var(--ease);
}
.case-play svg { width: 15px; height: 15px; margin-left: 2px; }
.case-card:hover .case-play {
  background: var(--accent); border-color: var(--accent); transform: scale(1.06);
}
.case-body { padding: 22px 22px 24px; }
.case-body .cat {
  font-size: 11.5px; font-weight: 700; letter-spacing: 1.4px; color: var(--accent);
}
.case-body h3 { font-size: 17px; font-weight: 700; margin-top: 10px; }
.case-body p { font-size: 14px; color: var(--ink-3); margin-top: 8px; }

.case-link {
  margin-top: 18px; display: inline-flex; align-items: center; gap: 7px;
  font-size: 13.5px; font-weight: 700; color: var(--ink);
  border-bottom: 1px solid var(--line); padding-bottom: 3px;
  transition: all 0.26s var(--ease);
}
.case-link:hover { color: var(--accent); border-bottom-color: var(--accent); gap: 11px; }

.case-more { margin-top: 44px; display: flex; gap: 14px; flex-wrap: wrap; }

/* 其他方向 */
.other-dirs {
  margin-top: 56px; padding: 40px 40px 34px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-warm);
}
.od-head h3 { font-size: 19px; font-weight: 800; }
.od-head p { margin-top: 10px; font-size: 14.5px; color: var(--ink-3); }
.od-list { margin-top: 26px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.od-list a {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 18px 20px; font-size: 15.5px; font-weight: 700;
  transition: all 0.26s var(--ease); display: block;
}
.od-list a:hover { border-color: var(--navy-900); transform: translateY(-3px); }
.od-list a span { display: block; font-size: 12.5px; font-weight: 500; color: var(--ink-3); margin-top: 7px; }
@media (max-width: 900px) { .od-list { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .od-list { grid-template-columns: 1fr; } .other-dirs { padding: 30px 24px 26px; } }

/* 案例详情弹层 */
.case-modal {
  position: fixed; inset: 0; z-index: 300;
  display: flex; align-items: center; justify-content: center;
  padding: 24px; opacity: 0; pointer-events: none; transition: opacity 0.28s var(--ease);
}
.case-modal.open { opacity: 1; pointer-events: auto; }
.cm-mask { position: absolute; inset: 0; background: rgba(7, 17, 32, 0.72); backdrop-filter: blur(4px); }
.cm-panel {
  position: relative; width: 100%; max-width: 760px; max-height: 88vh; overflow-y: auto;
  background: #fff; border-radius: 20px; padding: 0 0 32px;
  transform: translateY(14px); transition: transform 0.32s var(--ease);
}
.case-modal.open .cm-panel { transform: none; }
.cm-close {
  position: absolute; top: 14px; right: 14px; z-index: 2;
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.14); color: #fff; font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
.cm-close:hover { background: rgba(255, 255, 255, 0.26); }
.cm-media {
  aspect-ratio: 16 / 9; background: var(--navy-900);
  border-radius: 20px 20px 0 0; position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.cm-media::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 74% 16%, rgba(255, 90, 45, 0.2), transparent 62%);
}
.cm-media video { width: 100%; height: 100%; object-fit: cover; position: relative; z-index: 1; }
.cm-media .cm-media-no {
  position: relative; font-size: 46px; font-weight: 800;
  color: rgba(255, 255, 255, 0.16); letter-spacing: -1px;
}
.cm-media .cm-media-note {
  position: absolute; bottom: 16px; left: 20px; z-index: 1;
  font-size: 12px; letter-spacing: 1.2px; color: rgba(255, 255, 255, 0.45);
}
.cm-body { padding: 30px 34px 0; }
.cm-body .cat { font-size: 11.5px; font-weight: 700; letter-spacing: 1.4px; color: var(--accent); }
.cm-body h3 { font-size: 24px; font-weight: 800; margin-top: 12px; letter-spacing: -0.3px; }
.cm-body > p { margin-top: 14px; font-size: 15.5px; color: var(--ink-2); line-height: 1.8; }
.cm-fields { margin-top: 26px; border-top: 1px solid var(--line); }
.cm-fields li {
  display: grid; grid-template-columns: 130px 1fr; gap: 18px;
  padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 14.5px;
}
.cm-fields b { font-weight: 600; color: var(--ink-3); }
.cm-fields span { color: var(--ink-2); }
.cm-note { margin-top: 20px; font-size: 13.5px; color: var(--ink-3); }
.cm-body .btn { margin-top: 24px; }
@media (max-width: 620px) {
  .cm-panel { max-height: 92vh; }
  .cm-body { padding: 24px 22px 0; }
  .cm-fields li { grid-template-columns: 1fr; gap: 5px; }
  .cm-body h3 { font-size: 20px; }
}

/* ---------------- 06 重点产品 ---------------- */
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 980px) { .prod-grid { grid-template-columns: 1fr; } }
.prod-card {
  border-radius: var(--radius); padding: 40px 34px;
  background: var(--bg-warm); border: 1px solid var(--line);
  display: flex; flex-direction: column;
}
.prod-card.dark { background: var(--navy-900); border-color: var(--navy-900); color: #fff; }
.prod-card .no {
  font-size: 11.5px; font-weight: 800; letter-spacing: 2px;
  color: var(--accent); margin-bottom: 24px;
}
.prod-card h3 { font-size: 23px; font-weight: 800; letter-spacing: -0.3px; }
.prod-card p { margin-top: 16px; font-size: 15.5px; color: var(--ink-2); line-height: 1.8; flex: 1; }
.prod-card.dark p { color: rgba(255, 255, 255, 0.66); }
.prod-card .btn { margin-top: 30px; align-self: flex-start; }

/* ---------------- 07 为什么是星火 ---------------- */
.why-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (max-width: 820px) { .why-grid { grid-template-columns: 1fr; } }
.why-item { background: #fff; padding: 44px 40px; }
.why-item .no { font-size: 12px; font-weight: 800; letter-spacing: 2px; color: var(--accent); }
.why-item h3 { font-size: 22px; font-weight: 800; margin-top: 18px; letter-spacing: -0.3px; }
.why-item p { margin-top: 14px; font-size: 15.5px; color: var(--ink-2); line-height: 1.8; }
.why-foot {
  margin-top: 30px; padding: 26px 30px; border-radius: var(--radius);
  background: var(--navy-900); display: flex; align-items: center; gap: 18px;
}
.why-foot .bar { width: 3px; height: 34px; background: var(--accent); border-radius: 2px; flex-shrink: 0; }
.why-foot p { color: rgba(255, 255, 255, 0.88); font-size: 16.5px; font-weight: 600; }

/* ---------------- 08 合作流程 ---------------- */
.proc { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.proc-item { position: relative; }
.proc-item .no {
  font-size: 12px; font-weight: 800; letter-spacing: 1.6px; color: var(--accent);
  padding-bottom: 18px; border-bottom: 2px solid var(--line); margin-bottom: 22px;
}
.proc-item:last-child .no { border-bottom-color: var(--accent); }
.proc-item h3 { font-size: 16.5px; font-weight: 700; }
.proc-item p { margin-top: 10px; font-size: 13.5px; color: var(--ink-3); }
@media (max-width: 980px) { .proc { grid-template-columns: 1fr 1fr; gap: 30px; } }
@media (max-width: 560px) { .proc { grid-template-columns: 1fr; } }
.proc-note {
  margin-top: 46px; padding: 26px 30px; border-radius: var(--radius);
  border: 1px dashed var(--line); background: var(--bg-warm);
  font-size: 15.5px; color: var(--ink-2); display: flex; gap: 16px; align-items: flex-start;
}
.proc-note b { color: var(--ink); font-weight: 700; }

/* ---------------- 09 关于星火 ---------------- */
.about-grid { display: grid; grid-template-columns: 1fr 0.85fr; gap: 72px; align-items: center; }
@media (max-width: 980px) { .about-grid { grid-template-columns: 1fr; gap: 46px; } }
.about-copy p { font-size: 17px; line-height: 1.9; color: rgba(255, 255, 255, 0.72); margin-bottom: 20px; }
.about-copy p strong { color: #fff; font-weight: 600; }
.about-lines { display: grid; gap: 14px; }
.about-lines li {
  padding: 20px 24px; border-left: 2px solid rgba(255, 255, 255, 0.14);
  font-size: 16px; font-weight: 600; color: rgba(255, 255, 255, 0.85);
}
.about-lines li:first-child { border-left-color: var(--accent); }
.about-lines li span { display: block; font-size: 12.5px; font-weight: 500; color: rgba(255,255,255,0.4); margin-top: 6px; letter-spacing: 0.6px; }

/* ---------------- 10 最终 CTA ---------------- */
.final { background: var(--navy-900); color: #fff; position: relative; overflow: hidden; }
.final::before {
  content: ""; position: absolute; width: 620px; height: 620px; border-radius: 50%;
  left: 50%; bottom: -420px; transform: translateX(-50%);
  background: radial-gradient(circle, rgba(255, 90, 45, 0.2), transparent 66%);
}
.final .container { position: relative; }
.final h2 { font-size: clamp(28px, 3.8vw, 46px); font-weight: 800; line-height: 1.24; letter-spacing: -0.6px; }
.final .sub { margin-top: 24px; font-size: 17px; line-height: 1.85; color: rgba(255, 255, 255, 0.66); max-width: 660px; }
.entry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 54px; }
@media (max-width: 860px) { .entry-grid { grid-template-columns: 1fr; } }
.entry {
  padding: 26px 26px; border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.14); background: rgba(255, 255, 255, 0.03);
  transition: all 0.28s var(--ease);
}
.entry:hover { border-color: rgba(255, 255, 255, 0.4); background: rgba(255, 255, 255, 0.07); }
.entry .en { font-size: 11px; letter-spacing: 1.6px; color: var(--accent); font-weight: 700; }
.entry h3 { font-size: 18px; font-weight: 700; margin-top: 12px; }
.entry p { margin-top: 8px; font-size: 13.5px; color: rgba(255, 255, 255, 0.55); }
.final-actions { margin-top: 46px; display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.final-contact {
  margin-top: 40px; padding-top: 30px; border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex; gap: 40px; flex-wrap: wrap; font-size: 14px; color: rgba(255, 255, 255, 0.6);
}
.final-contact div span { display: block; font-size: 11.5px; letter-spacing: 1.2px; color: rgba(255,255,255,0.34); margin-bottom: 5px; }
.final-contact a { color: #fff; }
.final-contact a:hover { color: var(--accent); }

/* ---------------- 页脚 ---------------- */
.foot { background: var(--navy-950); color: rgba(255, 255, 255, 0.5); padding: 64px 0 30px; }
.foot-grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr; gap: 48px; padding-bottom: 44px; border-bottom: 1px solid rgba(255,255,255,0.08); }
@media (max-width: 820px) { .foot-grid { grid-template-columns: 1fr; gap: 32px; } }
.foot .brand-text .brand-cn { color: #fff; }
.foot .brand-mark { background: var(--accent); }
.foot p { font-size: 14px; line-height: 1.85; margin-top: 18px; }
.foot h5 { color: #fff; font-size: 14px; margin-bottom: 18px; font-weight: 700; letter-spacing: 0.4px; }
.foot li { font-size: 13.5px; margin-bottom: 11px; }
.foot li a:hover { color: var(--accent); }
.foot-bottom {
  padding-top: 26px; display: flex; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; font-size: 12.5px;
}

/* ---------------- 移动端底部固定条 ---------------- */
.mobile-bar {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 180;
  padding: 8px 16px calc(8px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-top: 1px solid var(--line);
  transform: translateY(110%);
  transition: transform 0.42s var(--ease);
}
.mobile-bar.show { transform: none; }
.mobile-bar .btn { width: 100%; height: 46px; padding: 0 24px; font-size: 14.5px; }
@media (max-width: 1024px) {
  .mobile-bar { display: block; }
  body { padding-bottom: 64px; }
}

/* ---------------- 动画 ---------------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: 0.09s; }
.reveal[data-d="2"] { transition-delay: 0.18s; }
.reveal[data-d="3"] { transition-delay: 0.27s; }
.reveal[data-d="4"] { transition-delay: 0.36s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}