/* ============================================================
   青屿科技 · 概念官网
   变量与基础
   ============================================================ */
:root {
  --navy: #0c1e39;
  --blue: #145cbd;
  --teal: #0d9488;
  --violet: #6d3bd4;
  --amber: #d98316;
  --rose: #e0537a;
  --sky: #dceafa;
  --light: #f6f8fb;
  --text: #1f2d3d;
  --muted: #68778a;
  --line: #dce1e8;
  --sans: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--sans); color: var(--text); background: #fff; overflow-x: hidden; }
h1, h2, h3 { margin: 0; }
ul, ol { list-style: none; margin: 0; padding: 0; }
a { text-decoration: none; color: inherit; }
code { font-family: ui-monospace, Menlo, Consolas, monospace; }

/* ============================================================
   导航
   ============================================================ */
.nav {
  height: 76px; display: flex; align-items: center; padding: 0 7vw;
  border-bottom: 1px solid #e5e9ee; justify-content: space-between;
  background: rgba(255, 255, 255, .92); backdrop-filter: saturate(160%) blur(12px);
  position: relative; z-index: 10;
}
.brand { color: var(--navy); font-size: 18px; font-weight: 800; letter-spacing: .03em; display: flex; align-items: center; }
.brand i { display: inline-block; height: 14px; width: 14px; background: #1971d4; border-radius: 2px; transform: rotate(45deg); margin-right: 10px; }
.nav nav { display: flex; gap: 30px; }
.nav nav a { color: #344255; font-size: 14px; position: relative; padding-bottom: 4px; transition: color .25s; }
.nav nav a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px; background: var(--blue); transition: width .3s; }
.nav nav a:hover { color: var(--blue); }
.nav nav a:hover::after { width: 100%; }
.nav-btn { background: var(--navy); color: #fff; font-size: 13px; padding: 11px 20px; transition: background .25s, transform .25s; }
.nav-btn:hover { background: var(--blue); transform: translateY(-2px); }
.nav nav a.on { color: var(--blue); }
.nav nav a.on::after { width: 100%; }
.nav-tools { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  position: relative; width: 38px; height: 38px; padding: 0; border-radius: 50%; cursor: pointer;
  border: 1px solid #dfe6ef; background: #fff; color: #4a5f7a; display: grid; place-items: center;
  transition: background .25s, color .25s, border-color .25s, transform .25s;
}
.theme-toggle:hover { transform: translateY(-2px); border-color: #b9cde4; color: var(--blue); }
.theme-toggle svg { position: absolute; width: 17px; height: 17px; transition: opacity .25s, transform .35s; }
.theme-toggle .t-moon { opacity: 0; transform: rotate(-40deg) scale(.6); }
html[data-theme="dark"] .theme-toggle .t-sun { opacity: 0; transform: rotate(40deg) scale(.6); }
html[data-theme="dark"] .theme-toggle .t-moon { opacity: 1; transform: none; }

.progress {
  position: fixed; left: 0; top: 0; height: 3px; width: 0; z-index: 90;
  background: linear-gradient(90deg, #2f7de0, #0d9488, #6d3bd4, #d98316);
  transition: width .12s linear;
}

/* ============================================================
   首屏 · 3D 场景
   ============================================================ */
.hero {
  min-height: 660px; position: relative; overflow: hidden;
  background: linear-gradient(112deg, #f6f9fd 0%, #e3efff 55%, #e8f4f4 100%);
  padding: 118px 7vw 35px;
}
.hero::before {
  content: ""; position: absolute; width: 560px; height: 560px; border-radius: 50%; pointer-events: none;
  left: -180px; top: -160px; background: radial-gradient(circle, rgba(109, 59, 212, .15), transparent 68%);
}
.hero::after {
  content: ""; position: absolute; width: 500px; height: 500px; border-radius: 50%; pointer-events: none;
  right: -140px; bottom: -180px; background: radial-gradient(circle, rgba(13, 148, 136, .16), transparent 68%);
}
.hero-inner { position: relative; z-index: 2; }
.hero-dust { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; opacity: .6; z-index: 1; }
.eyebrow { color: #3474c2; font-size: 12px; letter-spacing: .13em; font-weight: 700; margin: 0 0 23px; }
.hero h1 { color: var(--navy); font-size: clamp(45px, 5.6vw, 82px); line-height: 1.16; letter-spacing: -.02em; margin: 0; }
.hero-copy { line-height: 1.85; font-size: 16px; color: #465c76; margin: 26px 0 30px; }
.hero-actions { display: flex; gap: 24px; align-items: center; }
.hero-actions a { background: var(--blue); color: #fff; font-size: 14px; padding: 14px 22px; transition: transform .25s, box-shadow .25s; }
.hero-actions a:hover { transform: translateY(-3px); box-shadow: 0 12px 24px rgba(20, 92, 189, .28); }
.hero-actions .quiet { background: none; color: var(--navy); padding: 0 0 4px; border-bottom: 1px solid var(--navy); font-weight: 700; }
.hero-actions .quiet:hover { transform: none; box-shadow: none; color: var(--blue); border-color: var(--blue); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 38px 0 0; }
.hero-tags li { padding: 8px 16px; border: 1px solid rgba(20, 92, 189, .26); border-radius: 24px; font-size: 13px; color: #2f6fbe; background: rgba(255, 255, 255, .65); transition: transform .25s, background .25s; }
.hero-tags li:hover { transform: translateY(-3px); background: #fff; }

.hero-art { position: absolute; width: 530px; height: 530px; right: 6vw; top: 65px; }
.scene { position: absolute; inset: 0; perspective: 1100px; transform-style: preserve-3d; }
.ring { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); border: 1px solid rgba(48, 107, 176, .34); border-radius: 50%; }
.ring::after { content: ""; position: absolute; top: -4px; left: 50%; width: 7px; height: 7px; margin-left: -3.5px; border-radius: 50%; background: #4a9bf0; box-shadow: 0 0 12px #4a9bf0; }
.r1 { height: 340px; width: 340px; animation: spin 22s linear infinite; }
.r2 { height: 470px; width: 470px; animation: spin 34s linear infinite reverse; }
.r3 { height: 600px; width: 600px; border-color: rgba(48, 107, 176, .16); animation: spin 48s linear infinite; }
.core {
  position: absolute; left: 50%; top: 50%; width: 230px; height: 230px; margin: -115px 0 0 -115px;
  border-radius: 50%; background: linear-gradient(140deg, #287de4, #9dcbff);
  box-shadow: 0 0 0 22px rgba(255, 255, 255, .45), 0 18px 45px rgba(22, 84, 165, .22);
  transform: translateZ(-40px);
}
.brand-bloom { position: absolute; left: 50%; top: 50%; width: 290px; height: 290px; margin: -145px 0 0 -145px; z-index: 0; transform: rotate(-12deg); opacity: .74; }
.brand-bloom i { position: absolute; left: 50%; top: 50%; width: 76px; height: 142px; margin: -71px 0 0 -38px; border: 1px solid rgba(25, 113, 212, .38); border-radius: 76px 76px 18px 18px; background: linear-gradient(180deg, rgba(255,255,255,.78), rgba(123,187,255,.13)); transform-origin: 50% 71px; box-shadow: 0 8px 26px rgba(49,120,213,.08); }
.brand-bloom i:nth-child(1) { transform: rotate(0deg) translateY(-79px); }
.brand-bloom i:nth-child(2) { transform: rotate(60deg) translateY(-79px); }
.brand-bloom i:nth-child(3) { transform: rotate(120deg) translateY(-79px); }
.brand-bloom i:nth-child(4) { transform: rotate(180deg) translateY(-79px); }
.brand-bloom i:nth-child(5) { transform: rotate(240deg) translateY(-79px); }
.brand-bloom i:nth-child(6) { transform: rotate(300deg) translateY(-79px); }
.brand-bloom b { position: absolute; left: 50%; top: 50%; width: 28px; height: 28px; margin: -14px; border-radius: 50%; background: #ffd277; box-shadow: 0 0 0 9px rgba(255,255,255,.48), 0 0 22px rgba(255,185,66,.42); }
.cube-scene { position: absolute; inset: 0; display: grid; place-items: center; perspective: 900px; }
.cube { position: relative; width: 124px; height: 124px; transform-style: preserve-3d; animation: cube 18s linear infinite; }
.cube .face {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-size: 23px; font-weight: 700; letter-spacing: .08em;
  background: rgba(255, 255, 255, .92);
  border: 1px solid rgba(255, 255, 255, .95);
  box-shadow: inset 0 0 30px rgba(120, 180, 240, .22);
  backface-visibility: hidden;
}
.cube .f1 { transform: translateZ(62px); color: var(--blue); }
.cube .f2 { transform: rotateY(180deg) translateZ(62px); color: var(--teal); }
.cube .f3 { transform: rotateY(90deg) translateZ(62px); color: var(--violet); }
.cube .f4 { transform: rotateY(-90deg) translateZ(62px); color: var(--amber); }
.cube .f5 { transform: rotateX(90deg) translateZ(62px); color: var(--rose); }
.cube .f6 { transform: rotateX(-90deg) translateZ(62px); color: #0b7285; }
.data-card {
  position: absolute; background: rgba(255, 255, 255, .92); padding: 15px 19px;
  box-shadow: 0 10px 25px rgba(31, 64, 106, .1); min-width: 130px; border-radius: 8px;
}
.data-card b { font-size: 23px; display: block; color: var(--blue); }
.data-card span { font-size: 11px; color: var(--muted); }
.one { left: 10px; top: 122px; transform: translateZ(70px); animation: float 6s ease-in-out infinite; }
.two { right: 8px; bottom: 80px; transform: translateZ(50px); animation: float 7s ease-in-out .8s infinite; }
.two b { color: var(--teal); }
.chip {
  position: absolute; padding: 9px 17px; border-radius: 22px; background: rgba(255, 255, 255, .92);
  color: #2f6fbe; font-size: 13px; font-weight: 700; box-shadow: 0 12px 26px rgba(22, 84, 165, .16);
}
.c1 { left: 34px; bottom: 108px; transform: translateZ(40px); color: var(--teal); animation: float 6.5s ease-in-out .4s infinite; }
.c2 { right: 24px; top: 92px; transform: translateZ(84px); color: var(--violet); animation: float 7.5s ease-in-out 1.1s infinite; }
.hero-foot { position: absolute; bottom: 34px; font-size: 11px; letter-spacing: .1em; color: #72859e; }

/* ============================================================
   数据条
   ============================================================ */
.numbers { background: linear-gradient(120deg, #0c1e39 0%, #12294b 68%, #163152 100%); display: grid; grid-template-columns: repeat(4, 1fr); padding: 44px 7vw; color: #fff; }
.numbers article { padding: 0 30px; border-left: 1px solid #53657e; }
.numbers article:first-child { padding-left: 0; border: 0; }
.numbers b { display: block; font-size: 31px; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.numbers span { font-size: 12px; color: #b6c5da; }

/* ============================================================
   解决方案 · 轮播
   ============================================================ */
.solutions { padding: 130px 7vw; }
.section-top { display: grid; grid-template-columns: 1.1fr .9fr; gap: 5vw; align-items: end; }
.section-top .eyebrow { grid-column: 1 / -1; }
.section-top h2 { font-size: clamp(32px, 4.3vw, 62px); line-height: 1.16; letter-spacing: -.02em; color: var(--navy); }
.section-top > p:last-child { font-size: 15px; line-height: 1.9; color: var(--muted); max-width: 380px; }

.carousel { position: relative; margin-top: 68px; }
.carousel-viewport { overflow: hidden; border-radius: 22px; }
.carousel-track { display: flex; transition: transform .65s cubic-bezier(.22, .61, .36, 1); will-change: transform; }
.slide:nth-child(1) { --accent: #145cbd; --accent-2: #3d86e8; --wash: linear-gradient(140deg, #f5f9ff, #e6f0fd); --edge: #dbe7f6; }
.slide:nth-child(2) { --accent: #0d9488; --accent-2: #2bb3a0; --wash: linear-gradient(140deg, #f3fcf9, #d9f2ec); --edge: #cfe9e3; }
.slide:nth-child(3) { --accent: #6d3bd4; --accent-2: #9a72ea; --wash: linear-gradient(140deg, #f9f6ff, #ece2ff); --edge: #e0d6f7; }
.slide:nth-child(4) { --accent: #d98316; --accent-2: #f0ad3c; --wash: linear-gradient(140deg, #fdf8f0, #fbe8c9); --edge: #f2ddb6; }
.slide { flex: 0 0 100%; display: grid; grid-template-columns: 1fr 1fr; gap: 5vw; align-items: center; padding: 46px; background: var(--wash); border: 1px solid var(--edge); }
.slide-text i { font-style: normal; font-size: 13px; color: var(--accent); font-weight: 800; letter-spacing: .1em; }
.slide-text h3 { font-size: clamp(28px, 2.6vw, 38px); color: var(--navy); margin: 16px 0 14px; letter-spacing: -.02em; }
.slide-text > p { font-size: 15px; line-height: 1.85; color: #4a607a; margin: 0 0 22px; max-width: 460px; }
.slide-points { display: grid; gap: 9px; margin-bottom: 26px; }
.slide-points li { font-size: 13.5px; color: #3f5875; padding-left: 20px; position: relative; }
.slide-points li::before { content: ""; position: absolute; left: 0; top: 7px; width: 8px; height: 8px; border-radius: 2px; background: var(--accent); }
.slide-text > a { font-size: 13px; color: var(--accent); font-weight: 700; border-bottom: 1px solid var(--accent); padding-bottom: 3px; transition: opacity .25s; }
.slide-text > a:hover { opacity: .65; }

.slide-visual { position: relative; height: 340px; border-radius: 18px; background: #fff; border: 1px solid var(--edge); overflow: hidden; perspective: 900px; }
.slide-visual::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 50% 0%, var(--accent-2), transparent 62%); opacity: .2; }

.v1 .layer {
  position: absolute; left: 13%; width: 74%; height: 68px; border-radius: 16px; background: #fff;
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent); box-shadow: 0 16px 34px color-mix(in srgb, var(--accent) 16%, transparent);
  display: flex; align-items: center; justify-content: space-evenly; font-size: 13px; font-weight: 700; color: #2b4463;
}
.v1 .l1 { top: 15%; transform: rotateX(9deg) translateZ(0); }
.v1 .l2 { top: 38%; transform: rotateX(9deg) translateZ(50px); }
.v1 .l3 { top: 61%; transform: rotateX(9deg) translateZ(100px); }

.v2 .bars { position: absolute; left: 10%; right: 10%; bottom: 16%; height: 58%; display: flex; align-items: flex-end; gap: 4.5%; }
.v2 .bars i { flex: 1; height: var(--h); border-radius: 5px 5px 0 0; background: linear-gradient(180deg, var(--accent-2), var(--accent)); animation: bar 3.6s ease-in-out infinite alternate; }
.v2 .bars i:nth-child(2) { animation-delay: .18s; }
.v2 .bars i:nth-child(3) { animation-delay: .36s; }
.v2 .bars i:nth-child(4) { animation-delay: .54s; }
.v2 .bars i:nth-child(5) { animation-delay: .72s; }
.v2 .bars i:nth-child(6) { animation-delay: .9s; }
.v2 .bars i:nth-child(7) { animation-delay: 1.08s; }
.v2 .trend { position: absolute; left: 10%; top: 12%; padding: 8px 14px; border-radius: 12px; background: color-mix(in srgb, var(--accent) 12%, #fff); }
.v2 .trend span { font-size: 11px; color: #5b7a9c; }
.v2 .trend b { display: block; font-size: 19px; color: var(--accent); }

.v3 svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.v3 path { stroke: var(--accent-2); stroke-width: 1.6; fill: none; stroke-dasharray: 6 7; animation: dash 2.8s linear infinite; }
.v3 .node {
  position: absolute; width: 66px; height: 66px; border-radius: 50%; background: #fff;
  border: 2px solid var(--accent); color: var(--accent); font-size: 12.5px; font-weight: 800;
  display: grid; place-items: center; box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 20%, transparent);
}
.v3 .n1 { left: 8%; top: 16%; }
.v3 .n2 { right: 8%; top: 16%; }
.v3 .n3 { left: 8%; bottom: 16%; }
.v3 .n4 { right: 8%; bottom: 16%; }
.v3 .n5 { left: 50%; top: 50%; transform: translate(-50%, -50%); width: 74px; height: 74px; background: var(--navy); color: #fff; border-color: var(--navy); }

.v4 .shield {
  position: absolute; left: 50%; top: 46%; width: 132px; height: 152px; margin: -76px 0 0 -66px;
  background: linear-gradient(160deg, var(--accent-2), var(--accent));
  clip-path: polygon(50% 0, 100% 18%, 100% 62%, 50% 100%, 0 62%, 0 18%);
  display: grid; place-items: center; color: #fff; font-size: 46px;
  box-shadow: 0 24px 50px color-mix(in srgb, var(--accent) 28%, transparent); animation: float 6s ease-in-out infinite;
}
.v4 .pulse { position: absolute; inset: 0; display: grid; place-items: center; }
.v4 .pulse i { position: absolute; width: 180px; height: 180px; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); animation: ripple 3.8s ease-out infinite; }
.v4 .pulse i:nth-child(2) { animation-delay: 1.2s; }
.v4 .pulse i:nth-child(3) { animation-delay: 2.4s; }

.carousel-controls { display: flex; align-items: center; gap: 20px; margin-top: 30px; }
.c-btn {
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid #cbdcec; background: #fff;
  color: var(--navy); font-size: 17px; cursor: pointer; transition: background .25s, color .25s, transform .25s;
}
.c-btn:hover { background: var(--navy); color: #fff; transform: translateY(-2px); }
.c-dots { display: flex; gap: 9px; }
.c-dots button { width: 9px; height: 9px; border-radius: 50%; border: 0; background: #cfdcea; cursor: pointer; padding: 0; transition: width .3s, background .3s; }
.c-dots button.on { width: 28px; border-radius: 6px; background: var(--blue); }

/* ============================================================
   核心能力
   ============================================================ */
.ability { padding: 115px 10vw; background: var(--light); display: grid; grid-template-columns: 1fr 1fr; gap: 9vw; align-items: start; }
.ability h2 { font-size: clamp(38px, 4.7vw, 66px); line-height: 1.16; letter-spacing: -.02em; color: var(--navy); }
.ability-lead { font-size: 15px; line-height: 1.9; color: var(--muted); margin: 26px 0 0; }
.ability-list { border-top: 1px solid #cfd8e3; perspective: 1000px; }
.ability-list article:nth-child(1) { --c: #145cbd; }
.ability-list article:nth-child(2) { --c: #0d9488; }
.ability-list article:nth-child(3) { --c: #6d3bd4; }
.ability-list article:nth-child(4) { --c: #d98316; }
.ability-list article {
  padding: 24px 0; border-bottom: 1px solid #cfd8e3; display: grid; grid-template-columns: .8fr 1.3fr; gap: 15px;
  position: relative; transition: transform .35s, background .35s, padding .35s;
}
.ability-list article::before {
  content: ""; position: absolute; left: 0; top: 26px; bottom: 26px; width: 3px; border-radius: 2px;
  background: var(--c); opacity: 0; transition: opacity .35s;
}
.ability-list article:hover { transform: translateX(6px) rotateX(4deg); background: #fff; padding-left: 14px; }
.ability-list article:hover::before { opacity: 1; }
.ability-list b { font-size: 16px; color: var(--navy); }
.ability-list span { font-size: 13px; line-height: 1.65; color: var(--muted); }

/* ============================================================
   项目案例
   ============================================================ */
.case { display: grid; grid-template-columns: 1fr 1fr; min-height: 600px; }
.case-image { background: linear-gradient(150deg, #eef1ff, #e7eafb); display: grid; place-items: center; overflow: hidden; }
.screen-wrap { perspective: 1000px; display: grid; place-items: center; width: 100%; }
.screen {
  width: 72%; height: 330px; background: #fff; border: 8px solid #173b6d; box-shadow: 16px 18px 0 #a8c9ef;
  padding: 24px; transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transition: transform .35s ease;
}
.screen-nav { height: 12px; background: #dce8f7; width: 40%; margin-bottom: 26px; }
.screen-row { display: flex; gap: 11px; }
.screen-row i { display: block; width: 28%; height: 38px; background: #eaf1fa; }
.screen-chart {
  height: 126px; margin-top: 16px; border-bottom: 1px solid #d3dfed;
  background: linear-gradient(155deg, transparent 49%, #49a0e5 50%, #49a0e5 53%, transparent 54%),
              linear-gradient(27deg, transparent 57%, #1e5ba8 58%, #1e5ba8 61%, transparent 62%);
}
.screen-cols { display: flex; gap: 12px; margin-top: 18px; }
.screen-cols i { height: 10px; width: 45%; background: #dce8f7; }
.case-copy { padding: 105px 7vw; display: flex; flex-direction: column; justify-content: center; }
.case-copy h2 { font-size: clamp(36px, 4.4vw, 66px); line-height: 1.16; letter-spacing: -.02em; color: var(--navy); }
.case-copy > p:not(.eyebrow) { font-size: 15px; line-height: 1.9; color: var(--muted); margin: 28px 0; }
.case-meta { display: grid; gap: 10px; margin: 0 0 30px; }
.case-meta li { font-size: 14px; color: #42566e; display: flex; gap: 14px; }
.case-meta span { color: #93a5bb; min-width: 46px; }
.case-copy > a { font-size: 13px; color: var(--blue); font-weight: 700; border-bottom: 1px solid rgba(20, 92, 189, .4); padding-bottom: 3px; align-self: flex-start; transition: color .25s; }
.case-copy > a:hover { color: var(--navy); }

/* ============================================================
   更多实践
   ============================================================ */
.more-cases { padding: 100px 7vw; }
.more-head { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.more-head .eyebrow { margin: 0; }
.case-filter { display: flex; gap: 8px; flex-wrap: wrap; }
.case-filter button {
  border: 1px solid #dbe6f3; background: #fff; color: #4a6c94; font-family: inherit;
  font-size: 12.5px; font-weight: 700; padding: 8px 16px; border-radius: 22px; cursor: pointer;
  transition: background .25s, color .25s, border-color .25s, transform .25s;
}
.case-filter button:hover { transform: translateY(-2px); border-color: #b9cde4; }
.case-filter button.on { background: var(--navy); color: #fff; border-color: var(--navy); }
.more-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 40px; }
.more-grid article:nth-child(1) { --c: #145cbd; }
.more-grid article:nth-child(2) { --c: #0d9488; }
.more-grid article:nth-child(3) { --c: #6d3bd4; }
.more-grid article:nth-child(4) { --c: #d98316; }
.more-grid article:nth-child(5) { --c: #e0537a; }
.more-grid article:nth-child(6) { --c: #0b7285; }
.more-grid article:nth-child(7) { --c: #2f6fbe; }
.more-grid article.is-off { display: none; }
.more-grid article.is-new { animation: caseIn .38s cubic-bezier(.22, .61, .36, 1); }
.more-grid article {
  position: relative; display: flex; flex-direction: column;
  padding: 28px 26px; border: 1px solid #dbe6f3; border-top: 3px solid var(--c); border-radius: 16px; background: #fff;
  transition: transform .35s, box-shadow .35s, border-color .35s;
}
.more-grid article:hover { transform: translateY(-7px); box-shadow: 0 22px 44px color-mix(in srgb, var(--c) 16%, transparent); border-color: var(--c); }
.more-grid i { font-style: normal; font-size: 12px; color: var(--c); font-weight: 800; }
.more-grid h3 { font-size: 19px; color: var(--navy); margin: 14px 0 10px; }
.more-grid p { font-size: 14px; color: var(--muted); line-height: 1.75; margin: 0 0 14px; }
.more-grid span { font-size: 12px; color: #93a5bb; }

.card-hit { position: absolute; inset: 0; z-index: 2; border-radius: 16px; }
.card-hit:focus-visible { outline: 2px solid var(--c); outline-offset: 3px; }
.more-open {
  font-style: normal; font-size: 12.5px; font-weight: 700; color: var(--c);
  margin-top: auto; padding-top: 16px; transition: transform .3s;
}
.more-grid article:hover .more-open { transform: translateX(4px); }

/* 大屏入选案例 */
.more-grid article.is-feature {
  --c: #3fd8ff;
  grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1.05fr; gap: 34px; align-items: center;
  padding: 34px; border-radius: 18px; border: 1px solid #16304d; border-top: 1px solid #16304d;
  background:
    radial-gradient(620px 320px at 86% 8%, rgba(63, 216, 255, .2), transparent 70%),
    radial-gradient(520px 300px at 8% 108%, rgba(109, 59, 212, .24), transparent 70%),
    #071325;
  overflow: hidden;
}
.more-grid article.is-feature:hover { border-color: rgba(63, 216, 255, .5); box-shadow: 0 26px 62px rgba(6, 22, 44, .42); }
.is-feature i { color: #7fe6ff; letter-spacing: .16em; font-size: 11px; }
.is-feature h3 { color: #f2f9ff; font-size: clamp(22px, 2.2vw, 30px); line-height: 1.35; margin: 12px 0; }
.is-feature p { color: #9dbbd6; max-width: 470px; margin-bottom: 0; }
.is-feature .more-open { color: #8fe9ff; padding-top: 24px; }

.feature-visual {
  padding: 12px; border-radius: 12px;
  border: 1px solid rgba(87, 164, 255, .28);
  background: linear-gradient(160deg, rgba(16, 38, 70, .92), rgba(5, 12, 26, .96));
  box-shadow: inset 0 0 34px rgba(46, 118, 210, .18), 0 12px 30px rgba(3, 10, 22, .4);
}
.fv-top { display: flex; align-items: center; gap: 8px; padding-bottom: 8px; border-bottom: 1px solid rgba(87, 164, 255, .18); }
.fv-top span { width: 6px; height: 6px; border-radius: 50%; background: #3fd8ff; box-shadow: 0 0 8px #3fd8ff; }
.fv-top b { font-size: 11px; letter-spacing: .14em; color: #bcd9f2; }
.fv-top i { margin-left: auto; width: 34px; height: 5px; border-radius: 3px; background: rgba(63, 216, 255, .4); }
.fv-body { display: grid; grid-template-columns: .85fr 1.25fr .85fr; gap: 10px; padding-top: 10px; }
.fv-kpi { padding: 7px 8px; border-radius: 6px; background: rgba(74, 155, 240, .1); border: 1px solid rgba(74, 155, 240, .18); }
.fv-kpi + .fv-kpi { margin-top: 8px; }
.fv-kpi b { display: block; font-size: 15px; color: #eaf7ff; font-variant-numeric: tabular-nums; }
.fv-kpi span { font-size: 9.5px; color: #7f9dbd; }
.fv-line { height: 42px; }
.fv-line svg { width: 100%; height: 100%; display: block; }
.fv-line path { fill: none; stroke: #3fd8ff; stroke-width: 1.6; vector-effect: non-scaling-stroke; filter: drop-shadow(0 0 4px rgba(63, 216, 255, .7)); }
.fv-bars { display: flex; align-items: flex-end; gap: 5px; height: 50px; margin-top: 8px; }
.fv-bars i { flex: 1; height: var(--h); border-radius: 2px 2px 0 0; background: linear-gradient(180deg, #3fd8ff, rgba(63, 216, 255, .16)); }
.fv-donut {
  width: 46px; height: 46px; margin: 4px auto 0; border-radius: 50%;
  background: conic-gradient(#3fd8ff 0 62%, #4a9bf0 62% 86%, rgba(87, 164, 255, .16) 86% 100%);
  -webkit-mask: radial-gradient(farthest-side, transparent 62%, #000 64%);
  mask: radial-gradient(farthest-side, transparent 62%, #000 64%);
}
.fv-rows { display: grid; gap: 5px; margin-top: 10px; }
.fv-rows i { display: block; height: 4px; width: var(--w); border-radius: 2px; background: linear-gradient(90deg, rgba(74, 155, 240, .8), #3fd8ff); }

/* ============================================================
   合作流程
   ============================================================ */
.flow { padding: 120px 7vw; }
.flow .section-top { margin-bottom: 60px; }
.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.flow-steps li {
  position: relative; padding: 32px 26px 28px; border: 1px solid #dbe6f3; border-radius: 18px;
  background: #fff; transition: transform .35s, box-shadow .35s, border-color .35s;
}
.flow-steps li:nth-child(1) { --c: #145cbd; }
.flow-steps li:nth-child(2) { --c: #0d9488; }
.flow-steps li:nth-child(3) { --c: #6d3bd4; }
.flow-steps li:nth-child(4) { --c: #d98316; }
.flow-steps li::before {
  content: ""; position: absolute; left: 26px; top: 0; width: 42px; height: 3px; border-radius: 3px; background: var(--c);
}
.flow-steps li::after {
  content: ""; position: absolute; top: 46px; right: -20px; width: 20px; height: 1px; background: #cfdbea;
}
.flow-steps li:last-child::after { display: none; }
.flow-steps i { font-style: normal; font-size: 12px; font-weight: 800; letter-spacing: .12em; color: var(--c); }
.flow-steps b { display: block; font-size: 19px; color: var(--navy); margin: 12px 0 10px; }
.flow-steps p { margin: 0 0 18px; font-size: 13.5px; line-height: 1.78; color: var(--muted); }
.flow-steps span {
  display: inline-block; font-size: 12px; font-weight: 700; color: var(--c); border-radius: 14px; padding: 5px 11px;
  background: color-mix(in srgb, var(--c) 10%, #fff);
}
.flow-steps li:hover { transform: translateY(-6px); box-shadow: 0 22px 44px color-mix(in srgb, var(--c) 14%, transparent); border-color: color-mix(in srgb, var(--c) 38%, #dbe6f3); }

/* ============================================================
   常见问题
   ============================================================ */
.faq { padding: 120px 7vw; background: var(--light); display: grid; grid-template-columns: .82fr 1.18fr; gap: 6vw; align-items: start; }
.faq h2 { color: var(--navy); font-size: clamp(36px, 4.4vw, 64px); line-height: 1.16; letter-spacing: -.02em; }
.faq-head > p:last-child { font-size: 14px; line-height: 1.8; color: var(--muted); margin: 22px 0 0; max-width: 300px; }
.faq-list { border-top: 1px solid #cfd8e3; }
.faq-list details { border-bottom: 1px solid #cfd8e3; }
.faq-list summary {
  list-style: none; cursor: pointer; position: relative; padding: 22px 46px 22px 0;
  font-size: 16px; font-weight: 700; color: var(--navy); transition: color .25s;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+"; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 400; line-height: 1; color: #8da3bd; transition: color .25s;
}
.faq-list details[open] summary { color: var(--blue); }
.faq-list details[open] summary::after { content: "−"; color: var(--blue); }
.faq-list summary:hover { color: var(--blue); }
.faq-list details p { margin: -2px 0 24px; font-size: 14px; line-height: 1.85; color: #4a607a; max-width: 620px; }

/* ============================================================
   客户与资质
   ============================================================ */
.trust { padding: 110px 7vw; background: linear-gradient(180deg, #f3faf8, #ecf7f4); }
.trust h2 { color: var(--navy); font-size: clamp(36px, 4.6vw, 64px); line-height: 1.16; letter-spacing: -.02em; margin: 0 0 44px; }
.logo-wall { display: flex; flex-wrap: wrap; gap: 14px; }
.logo-wall li {
  padding: 17px 28px; border: 1px solid #d3e7e2; border-radius: 14px; background: #fff;
  font-size: 16px; font-weight: 700; color: #5a7391; transition: transform .3s, color .3s, border-color .3s;
}
.logo-wall li:hover { transform: translateY(-4px); color: var(--teal); border-color: #9fd3c9; }
.certs { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.certs li { padding: 10px 18px; border-radius: 24px; font-size: 13px; font-weight: 700; }
.certs li:nth-child(1) { background: #e8f2ff; color: #145cbd; }
.certs li:nth-child(2) { background: #e2f6f2; color: #0b8177; }
.certs li:nth-child(3) { background: #f0eaff; color: #5f34bd; }
.certs li:nth-child(4) { background: #fdf0dc; color: #b06a0c; }

/* ============================================================
   智能问答助手
   ============================================================ */
.ai { padding: 120px 7vw; background: linear-gradient(180deg, #fdf8f1, #fbf3e7); display: grid; grid-template-columns: .95fr 1.05fr; gap: 6vw; align-items: center; }
.ai h2 { color: var(--navy); font-size: clamp(34px, 4.2vw, 58px); line-height: 1.16; letter-spacing: -.02em; }
.ai-lead { font-size: 15px; line-height: 1.9; color: var(--muted); margin: 24px 0 22px; }
.ai-points { display: grid; gap: 10px; margin-bottom: 28px; }
.ai-points li { font-size: 14px; color: #42566e; padding-left: 24px; position: relative; line-height: 1.7; }
.ai-points li::before { content: "→"; position: absolute; left: 0; top: 0; color: var(--teal); font-weight: 700; }
.ai-badge { display: inline-block; padding: 7px 16px; border-radius: 22px; background: #fff5d6; color: #9a6b12; font-size: 12.5px; font-weight: 800; border: 1px solid #f0dda4; }
.chat { background: #fff; border-radius: 20px; border: 1px solid rgba(20, 92, 189, .12); box-shadow: 0 26px 60px rgba(16, 44, 84, .14); overflow: hidden; }
.chat-head { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid #e7eef7; }
.chat-dot { width: 10px; height: 10px; border-radius: 50%; background: #35c48c; box-shadow: 0 0 0 4px rgba(53, 196, 140, .18); }
.chat-head b { color: var(--navy); font-size: 15px; display: block; }
.chat-head span { font-size: 12px; color: var(--muted); }
.chat-head em { margin-left: auto; font-style: normal; font-size: 11px; color: #2f7de0; background: #eaf3ff; padding: 4px 10px; border-radius: 20px; }
.chat-body { padding: 20px; display: flex; flex-direction: column; gap: 12px; min-height: 236px; max-height: 330px; overflow-y: auto; }
.msg { max-width: 82%; padding: 11px 14px; border-radius: 14px; font-size: 14px; line-height: 1.65; white-space: pre-wrap; }
.msg.bot { background: #f1f6fd; color: #28405c; align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.user { background: var(--navy); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.typing { display: flex; gap: 5px; padding: 15px 16px; }
.msg.typing i { width: 7px; height: 7px; border-radius: 50%; background: #9fb6d0; animation: blink 1.2s infinite; }
.msg.typing i:nth-child(2) { animation-delay: .18s; }
.msg.typing i:nth-child(3) { animation-delay: .36s; }
.chat-suggest { display: flex; gap: 8px; padding: 0 20px 12px; flex-wrap: wrap; }
.chat-suggest button { border: 1px solid #cfe0f5; background: #f7fbff; color: #2f6fbe; font-size: 12px; padding: 7px 13px; border-radius: 20px; cursor: pointer; transition: background .25s, color .25s; }
.chat-suggest button:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
.chat-input { display: flex; gap: 8px; padding: 0 20px 14px; }
.chat-input input { flex: 1; border: 1px solid #dbe6f3; border-radius: 24px; padding: 11px 16px; font-size: 14px; font-family: inherit; outline: none; transition: border-color .25s, box-shadow .25s; }
.chat-input input:focus { border-color: #4a9bf0; box-shadow: 0 0 0 3px rgba(74, 155, 240, .16); }
.chat-input button { background: var(--blue); color: #fff; border: 0; border-radius: 24px; padding: 0 22px; font-size: 13px; font-weight: 700; cursor: pointer; transition: background .25s; }
.chat-input button:hover { background: var(--navy); }
.chat-note { padding: 0 20px 16px; font-size: 11px; color: #8b9bb0; line-height: 1.6; }
.chat-note code { background: #eef4fb; padding: 1px 5px; border-radius: 4px; font-size: 10.5px; color: #4a6c94; }

/* ---------- 悬浮助手入口 ---------- */
.assistant { position: fixed; right: 26px; bottom: 26px; z-index: 80; display: flex; flex-direction: column; align-items: flex-end; gap: 14px; pointer-events: none; }
.assistant-fab {
  position: relative; width: 54px; height: 54px; padding: 0; border: 0; border-radius: 50%;
  display: grid; place-items: center; color: #fff; cursor: pointer; pointer-events: auto;
  background: radial-gradient(130% 130% at 30% 18%, #5b9cf5 0%, #2563d8 44%, #5b34c8 100%);
  box-shadow: 0 12px 28px rgba(37, 99, 216, .42), inset 0 1px 0 rgba(255, 255, 255, .4);
  transition: transform .25s cubic-bezier(.22, .61, .36, 1), box-shadow .25s, opacity .3s ease;
}
.assistant-fab:hover { transform: translateY(-3px) scale(1.05); box-shadow: 0 20px 38px rgba(37, 99, 216, .5), inset 0 1px 0 rgba(255, 255, 255, .4); }
.assistant-fab:active { transform: scale(.95); }
.assistant-fab:focus-visible { outline: 3px solid #9cc6f5; outline-offset: 3px; }
.fab-orbit {
  position: absolute; inset: -3px; border-radius: 50%; pointer-events: none;
  background: conic-gradient(from 0deg, rgba(255, 255, 255, 0) 0deg, rgba(147, 208, 255, .95) 52deg, rgba(255, 255, 255, 0) 128deg);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 1.5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 1.5px));
  animation: orbit 3.6s linear infinite;
}
.fab-ico { width: 24px; height: 24px; transition: opacity .2s ease, transform .3s cubic-bezier(.22, .61, .36, 1); }
.fab-ico-close { position: absolute; opacity: 0; transform: rotate(-90deg) scale(.5); }
.assistant.is-open .fab-ico-open { opacity: 0; transform: rotate(90deg) scale(.5); }
.assistant.is-open .fab-ico-close { opacity: 1; transform: none; }
.assistant.is-open .fab-orbit { opacity: 0; }
.assistant.is-tucked:not(.is-open) .assistant-fab { opacity: 0; transform: translateY(18px) scale(.75); pointer-events: none; }

.assistant-panel {
  position: relative;
  width: var(--panel-w, 420px); max-width: calc(100vw - 16px);
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateY(14px) scale(.96); transform-origin: 100% 100%;
  transition: opacity .28s ease, transform .32s cubic-bezier(.22, .61, .36, 1), visibility .28s;
}
.assistant.is-open .assistant-panel { opacity: 1; visibility: visible; pointer-events: auto; transform: none; }
.assistant-panel .chat-head { padding: 14px 14px 14px 18px; }
.assistant-panel .chat-body { min-height: 0; height: var(--panel-h, min(52vh, 460px)); max-height: calc(100dvh - 280px); padding: 16px; }
.assistant-panel .chat-suggest { padding: 0 16px 10px; }
.assistant-panel .chat-input { padding: 0 16px 14px; }

.assistant-tools { margin-left: auto; display: flex; gap: 6px; }
.assistant-expand, .assistant-close {
  width: 26px; height: 26px; padding: 0; border: 0; border-radius: 50%;
  display: grid; place-items: center; background: #f1f6fd; color: #5b7290;
  font-size: 17px; line-height: 1; cursor: pointer;
  transition: background .2s, color .2s, transform .2s;
}
.assistant-expand:hover, .assistant-close:hover { background: #e3edf9; color: var(--navy); }
.assistant-expand:active, .assistant-close:active { transform: scale(.9); }
.assistant-expand svg { width: 13px; height: 13px; }
.assistant-expand .ico-min { display: none; }
.assistant.is-full .assistant-expand .ico-max { display: none; }
.assistant.is-full .assistant-expand .ico-min { display: block; }

.assistant-resize {
  position: absolute; left: 0; top: 0; width: 18px; height: 18px; z-index: 2;
  cursor: nwse-resize; touch-action: none;
}
.assistant-resize::before {
  content: ""; position: absolute; left: 5px; top: 5px; width: 6px; height: 6px;
  border-left: 2px solid #b9cee6; border-top: 2px solid #b9cee6; border-top-left-radius: 2px;
  opacity: .5; transition: opacity .2s;
}
.assistant-panel:hover .assistant-resize::before,
.assistant-panel.is-resizing .assistant-resize::before { opacity: 1; }
.assistant-panel.is-resizing { user-select: none; }

/* 全屏 */
.assistant.is-full .assistant-panel {
  position: fixed; inset: 0; width: 100%; max-width: none; height: 100vh; height: 100dvh;
  border: 0; border-radius: 0; display: flex; flex-direction: column;
  background: linear-gradient(160deg, #eaf2fc 0%, #f8fafd 55%, #edf3fa 100%);
}
.assistant.is-full .chat-head,
.assistant.is-full .chat-body,
.assistant.is-full .chat-suggest,
.assistant.is-full .chat-input { width: 100%; max-width: 860px; margin-left: auto; margin-right: auto; background: #fff; }
.assistant.is-full .chat-head { margin-top: 5vh; padding: 16px 22px; border-radius: 18px 18px 0 0; }
.assistant.is-full .chat-body { flex: 1; height: auto; min-height: 0; max-height: none; padding: 18px 22px; }
.assistant.is-full .chat-suggest { padding: 0 22px 10px; }
.assistant.is-full .chat-input { padding: 4px 22px 18px; border-radius: 0 0 18px 18px; box-shadow: 0 20px 44px rgba(16, 44, 84, .1); margin-bottom: 5vh; }
.assistant.is-full .assistant-resize,
.assistant.is-full .assistant-fab { display: none; }

@keyframes orbit { to { transform: rotate(360deg); } }

/* ============================================================
   关于青屿
   ============================================================ */
.about { padding: 120px 8vw; background: linear-gradient(158deg, #0c1e39 0%, #12294b 58%, #17264a 100%); color: #fff; display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px 7vw; align-items: start; }
.about .eyebrow { color: #93c5fb; }
.about h2 { color: #fff; font-size: clamp(36px, 4.4vw, 66px); line-height: 1.16; letter-spacing: -.02em; margin-bottom: 30px; }
.about-lead p:not(.eyebrow) { font-size: 15px; line-height: 2; color: #c8d6e9; margin: 0 0 18px; }
.values { display: grid; gap: 14px; }
.values article:nth-child(1) { --c: #4a9bf0; }
.values article:nth-child(2) { --c: #2bb3a0; }
.values article:nth-child(3) { --c: #9a72ea; }
.values article {
  padding: 22px 24px; border: 1px solid rgba(255, 255, 255, .14); border-radius: 14px;
  background: rgba(255, 255, 255, .04); position: relative; overflow: hidden;
  transition: transform .35s, background .35s;
}
.values article::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--c); }
.values article:hover { transform: translateY(-4px); background: rgba(255, 255, 255, .09); }
.values b { display: block; color: #fff; font-size: 16px; margin-bottom: 8px; }
.values span { font-size: 13px; color: #b9cbe4; line-height: 1.75; }
.timeline { grid-column: 1 / -1; border-top: 1px solid rgba(255, 255, 255, .14); padding-top: 46px; }
.timeline ol { display: flex; flex-wrap: wrap; gap: 30px; margin-top: 26px; }
.timeline li { flex: 1 1 170px; position: relative; padding-left: 18px; }
.timeline li:nth-child(1) { --c: #4a9bf0; }
.timeline li:nth-child(2) { --c: #2bb3a0; }
.timeline li:nth-child(3) { --c: #9a72ea; }
.timeline li:nth-child(4) { --c: #f0ad3c; }
.timeline li:nth-child(5) { --c: #e0537a; }
.timeline li::before { content: ""; position: absolute; left: 0; top: 7px; width: 8px; height: 8px; border-radius: 50%; background: var(--c); box-shadow: 0 0 0 4px color-mix(in srgb, var(--c) 22%, transparent); }
.timeline b { display: block; color: var(--c); font-size: 25px; letter-spacing: -.02em; }
.timeline span { display: block; font-size: 13px; color: #b9cbe4; line-height: 1.7; margin-top: 8px; }

/* ============================================================
   页脚
   ============================================================ */
footer { padding: 96px 7vw 48px; background: linear-gradient(122deg, #145cbd 0%, #1f4fd0 46%, #5b34c8 100%); color: #fff; }
.foot-main { display: grid; grid-template-columns: 1.05fr .95fr; gap: 6vw; align-items: start; }
footer .eyebrow { color: #bbdcff; }
footer h2 { color: #fff; font-size: clamp(43px, 5vw, 70px); line-height: 1.16; letter-spacing: -.02em; margin-bottom: 22px; }
.foot-lead { font-size: 14.5px; line-height: 1.85; color: #d5e6fb; margin: 0 0 32px; max-width: 380px; }
.foot-contact { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 24px; }
.foot-contact li { font-size: 14px; color: #dceafb; }
.foot-contact span { display: block; font-size: 11.5px; color: #9cc6f5; letter-spacing: .08em; margin-bottom: 3px; }

.contact-form { background: #fff; color: var(--text); border-radius: 20px; padding: 30px; display: grid; gap: 15px; box-shadow: 0 30px 64px rgba(6, 32, 72, .3); }
.c-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.c-field { display: grid; gap: 7px; }
.c-field > span { font-size: 12px; font-weight: 700; color: #5b7290; }
.c-field input, .c-field textarea {
  width: 100%; border: 1px solid #dbe6f3; border-radius: 11px; padding: 12px 14px; font-size: 14px;
  font-family: inherit; color: var(--navy); background: #fbfdff; outline: none; resize: vertical;
  transition: border-color .25s, box-shadow .25s, background .25s;
}
.c-field input::placeholder, .c-field textarea::placeholder { color: #a6b6c9; }
.c-field input:focus, .c-field textarea:focus { border-color: #4a9bf0; background: #fff; box-shadow: 0 0 0 3px rgba(74, 155, 240, .16); }
.c-field.is-bad input, .c-field.is-bad textarea { border-color: var(--rose); box-shadow: 0 0 0 3px rgba(224, 83, 122, .12); }
.contact-form button[type="submit"] {
  border: 0; border-radius: 11px; padding: 15px 24px; background: var(--navy); color: #fff;
  font-family: inherit; font-size: 14px; font-weight: 700; cursor: pointer; transition: background .25s, transform .25s;
}
.contact-form button[type="submit"]:hover { background: var(--blue); transform: translateY(-2px); }
.contact-form button[type="submit"]:disabled { opacity: .6; cursor: default; transform: none; }
.c-error { margin: 0; font-size: 12.5px; line-height: 1.6; color: #e0537a; }
.c-error:empty { display: none; }
.c-error.ok { color: var(--teal); }
.c-note { margin: 0; font-size: 11.5px; color: #8b9bb0; }
footer small { display: block; width: 100%; border-top: 1px solid rgba(255, 255, 255, .35); padding-top: 18px; margin-top: 62px; font-size: 11px; color: #cee1fa; }

/* ============================================================
   动效
   ============================================================ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .75s ease, transform .75s cubic-bezier(.22, .61, .36, 1); }
.reveal.in { opacity: 1; transform: none; }

@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }
@keyframes cube { from { transform: rotateX(-11deg) rotateY(0deg); } to { transform: rotateX(-11deg) rotateY(360deg); } }
@keyframes float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -14px; } }
@keyframes bar { from { height: calc(var(--h) * .55); } to { height: var(--h); } }
@keyframes dash { to { stroke-dashoffset: -26; } }
@keyframes ripple { 0% { transform: scale(.6); opacity: .9; } 100% { transform: scale(1.5); opacity: 0; } }
@keyframes blink { 0%, 60%, 100% { opacity: .3; } 30% { opacity: 1; } }
@keyframes caseIn { from { opacity: 0; transform: translateY(10px) scale(.98); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) and (min-width: 721px) {
  .hero-art { transform: scale(.8); transform-origin: 100% 0; }
  .nav nav { gap: 20px; }
}

@media (max-width: 980px) {
  .slide { grid-template-columns: 1fr; }
  .slide-visual { height: 280px; }
  .more-grid { grid-template-columns: 1fr 1fr; }
  .more-grid article.is-feature { grid-template-columns: 1fr; gap: 26px; padding: 30px 28px; }
  .feature-visual { max-width: 540px; }
  .flow-steps { grid-template-columns: 1fr 1fr; }
  .flow-steps li:nth-child(2)::after { display: none; }
  .faq { grid-template-columns: 1fr; gap: 44px; }
  .faq-head > p:last-child { max-width: 460px; }
  .ai { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; }
  .foot-main { grid-template-columns: 1fr; gap: 44px; }
  .contact-form { max-width: 560px; }
}

@media (max-width: 720px) {
  .nav { height: 62px; padding: 0 20px; }
  .nav nav { display: none; }
  .nav-tools { gap: 8px; }
  .nav-btn { padding: 9px 12px; font-size: 11px; }
  .theme-toggle { width: 34px; height: 34px; }
  .theme-toggle svg { width: 15px; height: 15px; }
  .hero { padding: 90px 25px 30px; min-height: 670px; }
  .hero h1 { font-size: clamp(40px, 14vw, 55px); }
  .hero-copy { font-size: 14px; }
  .hero-art { transform: scale(.62); transform-origin: right bottom; right: -40px; top: 240px; }
  .hero-tags { margin-top: 28px; }
  .hero-foot { display: none; }
  .numbers { grid-template-columns: repeat(2, 1fr); padding: 26px 25px; gap: 25px; }
  .numbers article { padding: 0 12px; }
  .numbers article:nth-child(3) { padding-left: 0; border: 0; }
  .numbers b { font-size: 26px; }
  .solutions { padding: 85px 25px; }
  .section-top { display: block; }
  .section-top h2 { font-size: clamp(26px, 8.4vw, 44px); }
  .section-top > p:last-child { margin-top: 25px; font-size: 14px; }
  .carousel { margin-top: 42px; }
  .slide { padding: 26px 22px; gap: 26px; }
  .slide-visual { height: 236px; }
  .slide-text h3 { font-size: 25px; }
  .slide-text > p { font-size: 14px; }
  .c-btn { width: 38px; height: 38px; }
  .ability { display: block; padding: 85px 25px; }
  .ability h2 { font-size: clamp(34px, 11.6vw, 47px); margin-bottom: 38px; }
  .ability-lead { font-size: 14px; }
  .ability-list article { grid-template-columns: 1fr; gap: 6px; }
  .case { display: block; }
  .case-image { min-height: 360px; }
  .screen { height: 245px; width: 84%; }
  .case-copy { padding: 80px 25px; }
  .case-copy h2 { font-size: clamp(34px, 11.6vw, 48px); }
  .more-cases { padding: 80px 25px; }
  .more-head { gap: 16px; }
  .case-filter { gap: 6px; }
  .case-filter button { font-size: 11.5px; padding: 7px 12px; }
  .more-grid { grid-template-columns: 1fr; gap: 16px; margin-top: 30px; }
  .more-grid article.is-feature { padding: 24px 18px; gap: 20px; }
  .is-feature h3 { font-size: 22px; }
  .is-feature .more-open { padding-top: 18px; }
  .feature-visual { padding: 10px; }
  .fv-body { gap: 7px; }
  .fv-kpi b { font-size: 13px; }
  .fv-kpi span { font-size: 9px; }
  .fv-bars { height: 40px; gap: 3px; }
  .fv-donut { width: 38px; height: 38px; }
  .flow { padding: 80px 25px; }
  .flow .section-top { margin-bottom: 34px; }
  .flow-steps { grid-template-columns: 1fr; gap: 14px; }
  .flow-steps li { padding: 26px 22px 24px; }
  .flow-steps li::after { display: none; }
  .faq { padding: 80px 25px; gap: 32px; }
  .faq h2 { font-size: clamp(32px, 11vw, 46px); }
  .faq-list summary { font-size: 15px; padding: 18px 34px 18px 0; }
  .faq-list details p { font-size: 13.5px; margin-bottom: 20px; }
  .trust { padding: 80px 25px; }
  .trust h2 { font-size: clamp(30px, 10.5vw, 44px); margin-bottom: 30px; }
  .logo-wall { gap: 10px; }
  .logo-wall li { padding: 13px 18px; font-size: 14px; }
  .ai { padding: 80px 25px; }
  .ai h2 { font-size: clamp(32px, 11vw, 46px); }
  .ai-lead { font-size: 14px; }
  .chat-body { min-height: 210px; }
  .about { padding: 85px 25px; }
  .about h2 { font-size: clamp(34px, 11.6vw, 48px); }
  .about-lead p:not(.eyebrow) { font-size: 14px; }
  .timeline ol { gap: 22px; }
  footer { padding: 80px 25px 40px; }
  .foot-main { display: block; }
  footer h2 { font-size: clamp(40px, 12vw, 62px); }
  .foot-contact { margin-top: 34px; grid-template-columns: 1fr; gap: 14px; }
  .contact-form { padding: 22px; margin-top: 34px; }
  .c-row { grid-template-columns: 1fr; }
  footer small { margin-top: 46px; }
  .assistant { right: 16px; bottom: 16px; gap: 10px; }
  .assistant-fab { width: 50px; height: 50px; }
  .fab-ico { width: 22px; height: 22px; }
  .assistant-panel { --panel-w: calc(100vw - 32px); --panel-h: min(54vh, 420px); }
  .assistant.is-full .chat-head { margin-top: 0; border-radius: 0; }
  .assistant.is-full .chat-input { margin-bottom: 0; border-radius: 0; box-shadow: none; padding-bottom: max(18px, env(safe-area-inset-bottom)); }
}

/* ============================================================
   深色模式
   ============================================================ */
html[data-theme="dark"] { color-scheme: dark; }
html[data-theme="dark"] body { background: #0a1524; color: #cfdcec; }
html[data-theme="dark"] .nav { background: rgba(10, 21, 36, .9); border-bottom-color: #1c2e46; }
html[data-theme="dark"] .brand { color: #eaf2ff; }
html[data-theme="dark"] .nav nav a { color: #a9bdd4; }
html[data-theme="dark"] .nav nav a:hover,
html[data-theme="dark"] .nav nav a.on { color: #6ea8f5; }
html[data-theme="dark"] .nav nav a::after { background: #5b9cf5; }
html[data-theme="dark"] .nav-btn { background: #2563d8; }
html[data-theme="dark"] .nav-btn:hover { background: #4a9bf0; }
html[data-theme="dark"] .theme-toggle { background: #13233a; border-color: #23374f; color: #8fc2f7; }
html[data-theme="dark"] .theme-toggle:hover { border-color: #3a5a80; color: #bcd9fb; }

html[data-theme="dark"] .hero { background: linear-gradient(112deg, #0b1a2e 0%, #102540 55%, #0d2231 100%); }
html[data-theme="dark"] .hero::before { background: radial-gradient(circle, rgba(109, 59, 212, .32), transparent 68%); }
html[data-theme="dark"] .hero::after { background: radial-gradient(circle, rgba(13, 148, 136, .28), transparent 68%); }
html[data-theme="dark"] .eyebrow { color: #6ea8f5; }
html[data-theme="dark"] .about .eyebrow, html[data-theme="dark"] footer .eyebrow { color: #93c5fb; }
html[data-theme="dark"] .hero h1 { color: #f2f8ff; }
html[data-theme="dark"] .hero-copy { color: #a6b9cf; }
html[data-theme="dark"] .hero-actions .quiet { color: #dbe9f8; border-bottom-color: rgba(219, 233, 248, .5); }
html[data-theme="dark"] .hero-actions .quiet:hover { color: #6ea8f5; border-color: #6ea8f5; }
html[data-theme="dark"] .hero-tags li { border-color: rgba(110, 168, 245, .3); color: #9cc6f5; background: rgba(255, 255, 255, .05); }
html[data-theme="dark"] .hero-tags li:hover { background: rgba(110, 168, 245, .14); }
html[data-theme="dark"] .ring { border-color: rgba(110, 168, 245, .26); }
html[data-theme="dark"] .r3 { border-color: rgba(110, 168, 245, .13); }
html[data-theme="dark"] .core { background: linear-gradient(140deg, #1d5fc0, #3d86e8); box-shadow: 0 0 0 22px rgba(110, 168, 245, .08), 0 18px 45px rgba(0, 0, 0, .42); }
html[data-theme="dark"] .cube .face { background: rgba(15, 29, 48, .95); border-color: rgba(110, 168, 245, .26); box-shadow: inset 0 0 30px rgba(74, 155, 240, .16); }
html[data-theme="dark"] .cube .f1 { color: #6ea8f5; }
html[data-theme="dark"] .cube .f2 { color: #2bb3a0; }
html[data-theme="dark"] .cube .f3 { color: #b79bf5; }
html[data-theme="dark"] .cube .f4 { color: #f0ad3c; }
html[data-theme="dark"] .cube .f5 { color: #f2819c; }
html[data-theme="dark"] .cube .f6 { color: #4fd1c0; }
html[data-theme="dark"] .data-card { background: rgba(16, 32, 52, .94); box-shadow: 0 10px 25px rgba(0, 0, 0, .32); }
html[data-theme="dark"] .data-card b { color: #6ea8f5; }
html[data-theme="dark"] .data-card.two b { color: #2bb3a0; }
html[data-theme="dark"] .data-card span { color: #8799ae; }
html[data-theme="dark"] .chip { background: rgba(16, 32, 52, .94); box-shadow: 0 12px 26px rgba(0, 0, 0, .28); }
html[data-theme="dark"] .chip.c1 { color: #2bb3a0; }
html[data-theme="dark"] .chip.c2 { color: #b79bf5; }
html[data-theme="dark"] .hero-foot { color: #6a8099; }

html[data-theme="dark"] .section-top h2 { color: #eaf2ff; }
html[data-theme="dark"] .section-top > p:last-child { color: #93a7bd; }
html[data-theme="dark"] .slide:nth-child(1) { --wash: linear-gradient(140deg, #0f1d30, #13273f); --edge: #21405f; }
html[data-theme="dark"] .slide:nth-child(2) { --wash: linear-gradient(140deg, #0d201f, #102a28); --edge: #1d403c; }
html[data-theme="dark"] .slide:nth-child(3) { --wash: linear-gradient(140deg, #141026, #1b1533); --edge: #332a52; }
html[data-theme="dark"] .slide:nth-child(4) { --wash: linear-gradient(140deg, #201709, #2a1d0b); --edge: #4a3616; }
html[data-theme="dark"] .slide-text h3 { color: #f0f6ff; }
html[data-theme="dark"] .slide-text > p { color: #9fb3c9; }
html[data-theme="dark"] .slide-points li { color: #a8bcd2; }
html[data-theme="dark"] .slide-visual { background: #0c1a2b; }
html[data-theme="dark"] .slide-visual::before { opacity: .26; }
html[data-theme="dark"] .v1 .layer { background: #12233a; color: #cfe0f4; border-color: color-mix(in srgb, var(--accent) 42%, transparent); box-shadow: 0 16px 34px rgba(0, 0, 0, .36); }
html[data-theme="dark"] .v2 .trend { background: color-mix(in srgb, var(--accent) 22%, #0c1a2b); }
html[data-theme="dark"] .v2 .trend span { color: #93a9c2; }
html[data-theme="dark"] .v3 .node { background: #12233a; box-shadow: 0 10px 24px rgba(0, 0, 0, .36); }
html[data-theme="dark"] .v3 .n5 { background: #eaf2ff; color: #0c1e39; border-color: #eaf2ff; }
html[data-theme="dark"] .c-btn { background: #101f33; border-color: #26405c; color: #dbe9f8; }
html[data-theme="dark"] .c-btn:hover { background: #4a9bf0; color: #04121f; }
html[data-theme="dark"] .c-dots button { background: #2a3f57; }
html[data-theme="dark"] .c-dots button.on { background: #5b9cf5; }

html[data-theme="dark"] .ability { background: #0b1729; }
html[data-theme="dark"] .ability h2 { color: #eaf2ff; }
html[data-theme="dark"] .ability-lead { color: #93a7bd; }
html[data-theme="dark"] .ability-list { border-top-color: #23374f; }
html[data-theme="dark"] .ability-list article { border-bottom-color: #23374f; }
html[data-theme="dark"] .ability-list article:hover { background: #12233a; }
html[data-theme="dark"] .ability-list b { color: #e7f1fd; }
html[data-theme="dark"] .ability-list span { color: #93a7bd; }

html[data-theme="dark"] .case-image { background: linear-gradient(150deg, #101d36, #0d1930); }
html[data-theme="dark"] .screen { background: #0f1f33; border-color: #3d86e8; box-shadow: 16px 18px 0 #173456; }
html[data-theme="dark"] .screen-nav,
html[data-theme="dark"] .screen-cols i { background: #22395a; }
html[data-theme="dark"] .screen-row i { background: #1a2c47; }
html[data-theme="dark"] .screen-chart { border-bottom-color: #23374f; }
html[data-theme="dark"] .case-copy h2 { color: #eaf2ff; }
html[data-theme="dark"] .case-copy > p:not(.eyebrow) { color: #93a7bd; }
html[data-theme="dark"] .case-meta li { color: #a8bcd2; }
html[data-theme="dark"] .case-meta span { color: #6a8099; }
html[data-theme="dark"] .case-copy > a { color: #6ea8f5; border-bottom-color: rgba(110, 168, 245, .4); }
html[data-theme="dark"] .case-copy > a:hover { color: #dbe9f8; }

html[data-theme="dark"] .case-filter button { background: #101f33; border-color: #23374f; color: #a8bcd2; }
html[data-theme="dark"] .case-filter button:hover { border-color: #3a5a80; }
html[data-theme="dark"] .case-filter button.on { background: #4a9bf0; color: #04121f; border-color: #4a9bf0; }
html[data-theme="dark"] .more-grid article { background: #101d31; border-color: #1f3550; border-top-color: var(--c); }
html[data-theme="dark"] .more-grid article:hover { border-color: var(--c); box-shadow: 0 22px 44px rgba(0, 0, 0, .38); }
html[data-theme="dark"] .more-grid i { filter: brightness(1.4); }
html[data-theme="dark"] .more-grid h3 { color: #eaf2ff; }
html[data-theme="dark"] .more-grid p { color: #93a7bd; }
html[data-theme="dark"] .more-grid span { color: #6a8099; }
html[data-theme="dark"] .more-grid .more-open { color: color-mix(in srgb, var(--c) 50%, #eaf2ff); }
html[data-theme="dark"] .more-grid article.is-feature {
  border-color: #1b3a5c;
  background:
    radial-gradient(620px 320px at 86% 8%, rgba(63, 216, 255, .2), transparent 70%),
    radial-gradient(520px 300px at 8% 108%, rgba(109, 59, 212, .24), transparent 70%),
    #06101f;
}
html[data-theme="dark"] .more-grid article.is-feature:hover { border-color: rgba(63, 216, 255, .5); }
html[data-theme="dark"] .more-grid article.is-feature i { filter: none; }

html[data-theme="dark"] .flow-steps li { background: #101d31; border-color: #1f3550; }
html[data-theme="dark"] .flow-steps i { filter: brightness(1.35); }
html[data-theme="dark"] .flow-steps b { color: #eaf2ff; }
html[data-theme="dark"] .flow-steps p { color: #93a7bd; }
html[data-theme="dark"] .flow-steps li::after { background: #2a435f; }
html[data-theme="dark"] .flow-steps span { background: color-mix(in srgb, var(--c) 22%, #0d1a2c); }
html[data-theme="dark"] .flow-steps li:hover { border-color: color-mix(in srgb, var(--c) 55%, #1f3550); box-shadow: 0 22px 44px rgba(0, 0, 0, .4); }

html[data-theme="dark"] .faq { background: #0b1729; }
html[data-theme="dark"] .faq h2 { color: #eaf2ff; }
html[data-theme="dark"] .faq-head > p:last-child { color: #93a7bd; }
html[data-theme="dark"] .faq-list { border-top-color: #23374f; }
html[data-theme="dark"] .faq-list details { border-bottom-color: #23374f; }
html[data-theme="dark"] .faq-list summary { color: #e7f1fd; }
html[data-theme="dark"] .faq-list summary::after { color: #6a8099; }
html[data-theme="dark"] .faq-list summary:hover,
html[data-theme="dark"] .faq-list details[open] summary { color: #6ea8f5; }
html[data-theme="dark"] .faq-list details[open] summary::after { color: #6ea8f5; }
html[data-theme="dark"] .faq-list details p { color: #9fb3c9; }

html[data-theme="dark"] .trust { background: linear-gradient(180deg, #0a1c1c, #081716); }
html[data-theme="dark"] .trust h2 { color: #eaf2ff; }
html[data-theme="dark"] .logo-wall li { background: #0f2020; border-color: #1d3b38; color: #9db6c8; }
html[data-theme="dark"] .logo-wall li:hover { color: #2bb3a0; border-color: #2bb3a0; }
html[data-theme="dark"] .certs li:nth-child(1) { background: #132744; color: #7fb3f5; }
html[data-theme="dark"] .certs li:nth-child(2) { background: #0f2b28; color: #4fd1c0; }
html[data-theme="dark"] .certs li:nth-child(3) { background: #1d1638; color: #b79bf5; }
html[data-theme="dark"] .certs li:nth-child(4) { background: #2b1f0c; color: #f0ad3c; }

html[data-theme="dark"] .ai { background: linear-gradient(180deg, #1a1509, #120f07); }
html[data-theme="dark"] .ai h2 { color: #eaf2ff; }
html[data-theme="dark"] .ai-lead { color: #a2b2c6; }
html[data-theme="dark"] .ai-points li { color: #a8bcd2; }
html[data-theme="dark"] .ai-badge { background: #2a2008; color: #f0c46a; border-color: #4a3a12; }

html[data-theme="dark"] .chat { background: #0f1d31; border-color: #1f3550; box-shadow: 0 26px 60px rgba(0, 0, 0, .45); }
html[data-theme="dark"] .chat-head { border-bottom-color: #1f3550; }
html[data-theme="dark"] .chat-head b { color: #eaf2ff; }
html[data-theme="dark"] .chat-head span { color: #8799ae; }
html[data-theme="dark"] .chat-head em { background: #16294a; color: #7fb3f5; }
html[data-theme="dark"] .msg.bot { background: #16283f; color: #cfe0f4; }
html[data-theme="dark"] .msg.user { background: #2563d8; color: #fff; }
html[data-theme="dark"] .msg.typing i { background: #4a6484; }
html[data-theme="dark"] .chat-suggest button { background: #101f33; border-color: #26405c; color: #8fc2f7; }
html[data-theme="dark"] .chat-suggest button:hover { background: #4a9bf0; color: #04121f; border-color: #4a9bf0; }
html[data-theme="dark"] .chat-input input { background: #101f33; border-color: #23374f; color: #eaf2ff; }
html[data-theme="dark"] .chat-input input::placeholder { color: #647a94; }
html[data-theme="dark"] .chat-input input:focus { background: #0d1a2c; border-color: #4a9bf0; }
html[data-theme="dark"] .chat-input button { background: #2563d8; }
html[data-theme="dark"] .chat-input button:hover { background: #4a9bf0; }
html[data-theme="dark"] .chat-note { color: #6a8099; }
html[data-theme="dark"] .chat-note code { background: #16283f; color: #8fb7e0; }

html[data-theme="dark"] .assistant-expand,
html[data-theme="dark"] .assistant-close { background: #16283f; color: #9fb6d0; }
html[data-theme="dark"] .assistant-expand:hover,
html[data-theme="dark"] .assistant-close:hover { background: #24405f; color: #eaf2ff; }
html[data-theme="dark"] .assistant-resize::before { border-color: #3a5a80; }
html[data-theme="dark"] .assistant.is-full .assistant-panel { background: linear-gradient(160deg, #0a1524, #0d1a2c 55%, #081421); }
html[data-theme="dark"] .assistant.is-full .chat-input { box-shadow: 0 20px 44px rgba(0, 0, 0, .4); }

html[data-theme="dark"] footer { background: linear-gradient(122deg, #103c7d 0%, #16307f 46%, #35207a 100%); }
html[data-theme="dark"] .contact-form { background: #0f1d31; box-shadow: 0 30px 64px rgba(0, 0, 0, .45); }
html[data-theme="dark"] .c-field > span { color: #8fa6bf; }
html[data-theme="dark"] .c-field input,
html[data-theme="dark"] .c-field textarea { background: #0c1929; border-color: #23374f; color: #eaf2ff; }
html[data-theme="dark"] .c-field input::placeholder,
html[data-theme="dark"] .c-field textarea::placeholder { color: #5f7590; }
html[data-theme="dark"] .c-field input:focus,
html[data-theme="dark"] .c-field textarea:focus { background: #0a1524; border-color: #4a9bf0; }
html[data-theme="dark"] .contact-form button[type="submit"] { background: #2563d8; }
html[data-theme="dark"] .contact-form button[type="submit"]:hover { background: #4a9bf0; }
html[data-theme="dark"] .c-error { color: #f2819c; }
html[data-theme="dark"] .c-error.ok { color: #4fd1c0; }
html[data-theme="dark"] .c-note { color: #6a8099; }