/* ============================================================
   行远 · 面向高职院校的 AI 就业赋能平台 · 落地页样式
   风格：沉稳商务 / 权威编辑感
   主色 深蓝灰 #1e293b · 强调 暖金 #c99a3f/#f5c451
   ============================================================ */

:root {
  --ink:        #16202e;   /* 最深 文字/深底 */
  --slate:      #1e293b;   /* 主色 深蓝灰 */
  --slate-2:    #334155;
  --slate-soft: #475569;
  --muted:      #64748b;   /* 辅助文字 */
  --line:       #dbe3ec;   /* 浅灰蓝细边 */
  --fog:        #f4f6fa;   /* 页面雾灰蓝底 */
  --paper:      #ffffff;
  --gold:       #c99a3f;   /* 暖金（正文可读） */
  --gold-lite:  #f5c451;   /* 亮金（点缀/深底上） */
  --gold-wash:  #f7efdc;
  --green:      #4f9d76;
  --red:        #c26b5a;

  --serif: "Noto Serif SC", "Songti SC", "SimSun", "Microsoft YaHei", serif;
  --sans:  "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;

  --maxw: 1180px;
  --r-lg: 16px;
  --r-md: 12px;
  --r-sm: 8px;
  --shadow: 0 18px 40px -24px rgba(20,32,46,.28);
  --shadow-sm: 0 8px 24px -16px rgba(20,32,46,.30);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--slate);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

h1,h2,h3,h4 { font-family: var(--serif); font-weight: 700; line-height: 1.28; color: var(--slate); }

a { color: inherit; text-decoration: none; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  padding: 14px 30px;
  background: var(--gold-lite);
  color: var(--ink);
  font-weight: 700; font-size: 15px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
  box-shadow: 0 10px 24px -14px rgba(201,154,63,.9);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -14px rgba(201,154,63,.95); background: #ffd166; }
.btn--ghost { background: transparent; color: #e8edf4; border-color: rgba(232,237,244,.35); box-shadow: none; }
.btn--ghost:hover { background: rgba(255,255,255,.08); border-color: rgba(232,237,244,.6); }
.btn--sm { padding: 9px 20px; font-size: 14px; }

/* ============ 顶部导航 ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0);
  transition: background .3s ease, box-shadow .3s ease, border-color .3s;
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom-color: var(--line);
  box-shadow: 0 6px 24px -20px rgba(20,32,46,.5);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; font-size: 18px; color: #fff; letter-spacing: .5px; }
.brand__mark { display: inline-flex; color: currentColor; }
.brand__text { font-size: 22px; letter-spacing: 4px; }
.brand__text em { font-style: normal; color: var(--gold-lite); }
.nav.is-stuck .brand { color: var(--slate); }

.nav__links { display: flex; gap: 26px; }
.nav__links a { font-size: 15px; color: rgba(255,255,255,.82); position: relative; padding: 4px 0; transition: color .2s; }
.nav__links a::after { content:""; position:absolute; left:0; bottom:-2px; width:0; height:2px; background:var(--gold-lite); transition:width .25s ease; }
.nav__links a:hover { color: #fff; }
.nav__links a:hover::after { width: 100%; }
.nav.is-stuck .nav__links a { color: var(--slate-soft); }
.nav.is-stuck .nav__links a:hover { color: var(--slate); }

/* ============ 1. Hero ============ */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(160deg, #16202e 0%, #1e293b 46%, #263449 100%);
  color: #eef2f7; overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(60% 55% at 78% 20%, rgba(245,196,81,.14), transparent 60%),
    radial-gradient(50% 50% at 12% 82%, rgba(122,162,214,.14), transparent 60%);
}
.hero__bg::after {
  content:""; position:absolute; inset:0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(75% 75% at 50% 40%, #000 30%, transparent 75%);
}
.hero__inner { position: relative; z-index: 1; padding: 120px 0 90px; max-width: 900px; }

.eyebrow {
  display: inline-block; font-size: 14px; letter-spacing: 3px; color: var(--gold-lite);
  padding: 7px 16px; border: 1px solid rgba(245,196,81,.32); border-radius: 100px;
  margin-bottom: 26px; background: rgba(245,196,81,.06);
}
.hero__title { font-size: clamp(32px, 5.4vw, 60px); font-weight: 900; letter-spacing: 1px; color: #fff; }
.hero__title .hl { color: var(--gold-lite); }
.hero__title .strike { position: relative; color: #b6c1d1; }
.hero__title .strike::after { content:""; position:absolute; left:-2%; right:-2%; top:52%; height:3px; background:var(--red); transform:rotate(-3deg); border-radius:2px; }

.hero__sub { margin-top: 26px; font-size: clamp(16px, 2vw, 20px); color: #c3cddb; max-width: 640px; }
.hero__actions { margin-top: 40px; display: flex; gap: 16px; flex-wrap: wrap; }

.hero__stats { margin-top: 56px; display: flex; align-items: center; gap: 30px; }
.stat { display: flex; flex-direction: column; }
.stat__num { font-family: var(--serif); font-size: 40px; font-weight: 900; color: var(--gold-lite); line-height: 1; }
.stat__label { font-size: 14px; color: #93a1b4; margin-top: 8px; }
.stat__sep { width: 1px; height: 42px; background: rgba(255,255,255,.14); }

.hero__scroll { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); z-index:1; font-size: 12px; letter-spacing: 2px; color:#7e8da0; display:flex; flex-direction:column; align-items:center; gap:8px; }
.hero__scroll span { width: 1px; height: 34px; background: linear-gradient(var(--gold-lite), transparent); animation: scrolldn 1.8s ease-in-out infinite; }
@keyframes scrolldn { 0%{transform:scaleY(0);transform-origin:top} 45%{transform:scaleY(1);transform-origin:top} 55%{transform:scaleY(1);transform-origin:bottom} 100%{transform:scaleY(0);transform-origin:bottom} }

/* ============ 通用 section ============ */
.section { padding: 108px 0; position: relative; }
.sec-head { max-width: 720px; margin-bottom: 56px; }
.sec-num {
  display: inline-block; font-family: var(--serif); font-size: 15px; font-weight: 700;
  color: var(--gold); letter-spacing: 3px; padding-bottom: 8px; margin-bottom: 14px;
  border-bottom: 2px solid var(--gold-wash); position: relative;
}
.sec-num::after { content:""; position:absolute; left:0; bottom:-2px; width:26px; height:2px; background:var(--gold); }
.sec-title { font-size: clamp(26px, 3.4vw, 40px); }
.sec-lead { margin-top: 18px; font-size: 17px; color: var(--muted); }
.sec-head--light .sec-title, .sec-head--light .sec-lead { color: #e8edf4; }
.sec-head--light .sec-lead { color: #a9b6c8; }
.sec-head--light .sec-num { color: var(--gold-lite); border-bottom-color: rgba(245,196,81,.25); }

/* ============ 2. 痛点 ============ */
.pain { background: var(--fog); border-top: 1px solid var(--line); }
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pain-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 38px 32px; box-shadow: var(--shadow-sm);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
.pain-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #c9d4e2; }
.pain-card__ico { font-size: 32px; width: 60px; height: 60px; display: grid; place-items: center; background: var(--fog); border-radius: 14px; margin-bottom: 22px; }
.pain-card h3 { font-size: 21px; margin-bottom: 12px; }
.pain-card p { color: var(--muted); font-size: 15.5px; }

/* ============ 3. 双主线 ============ */
.solution { background: var(--paper); }
.dual { display: grid; grid-template-columns: 1fr auto 1fr; align-items: stretch; gap: 0; }
.dual__col {
  padding: 42px 40px; border: 1px solid var(--line); border-radius: var(--r-lg);
  position: relative; background: var(--fog);
}
.dual__col--student { border-top: 4px solid var(--slate); }
.dual__col--school { border-top: 4px solid var(--gold); background: #fbf8f1; }
.dual__tag {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px;
  color: #fff; background: var(--slate); padding: 5px 14px; border-radius: 100px; margin-bottom: 18px;
}
.dual__tag--gold { background: var(--gold); }
.dual__col h3 { font-size: 23px; margin-bottom: 12px; }
.dual__col > p { color: var(--muted); font-size: 15.5px; margin-bottom: 22px; }
.dual__list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.dual__list li { position: relative; padding-left: 26px; font-size: 15.5px; color: var(--slate-2); }
.dual__list li::before { content:"✓"; position:absolute; left:0; top:0; color:var(--gold); font-weight:700; }
.dual__col--student .dual__list li::before { color: var(--slate); }

.dual__link { display: grid; place-items: center; padding: 0 8px; }
.dual__link span {
  writing-mode: vertical-rl; font-size: 13px; letter-spacing: 4px; color: var(--muted);
  padding: 16px 6px; border-left: 1px dashed var(--line); border-right: 1px dashed var(--line);
  position: relative;
}
.dual__link span::before, .dual__link span::after { content:"◆"; display:block; color:var(--gold); font-size:10px; text-align:center; margin:6px 0; writing-mode:horizontal-tb; }

/* ============ 4. 闭环流程 ============ */
.flow { background: var(--fog); border-top: 1px solid var(--line); }
.flowline {
  list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px 16px;
  counter-reset: fn; position: relative;
}
.flownode {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 24px 22px; position: relative;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
.flownode:hover { transform: translateY(-5px); box-shadow: var(--shadow-sm); border-color: var(--gold); }
.flownode__i { font-family: var(--serif); font-size: 14px; font-weight: 700; color: var(--gold); letter-spacing: 1px; }
.flownode h4 { font-size: 18px; margin: 8px 0 6px; }
.flownode p { font-size: 13.5px; color: var(--muted); }
/* 箭头（大屏水平） */
.flownode:not(:nth-child(4n)):not(:last-child)::after {
  content:"→"; position:absolute; right:-14px; top:50%; transform:translateY(-50%);
  color:var(--gold); font-size:18px; z-index:2; font-weight:700;
}
.flownode--gold { background: linear-gradient(150deg, #1e293b, #2c3c52); border-color: var(--slate); }
.flownode--gold .flownode__i { color: var(--gold-lite); }
.flownode--gold h4 { color: #fff; }
.flownode--gold p { color: #aebacb; }
.flow__loop { text-align: center; margin-top: 36px; font-size: 15px; color: var(--muted); font-style: italic; }

/* ============ 5. 学生能力 ============ */
.student { background: var(--paper); }
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cap {
  border: 1px solid var(--line); border-radius: var(--r-lg); padding: 34px 30px;
  background: var(--paper); position: relative; overflow: hidden;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
.cap::before { content:""; position:absolute; left:0; top:0; width:100%; height:3px; background:linear-gradient(90deg,var(--gold),transparent); transform:scaleX(0); transform-origin:left; transition:transform .35s ease; }
.cap:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #c9d4e2; }
.cap:hover::before { transform: scaleX(1); }
.cap__ico { font-size: 30px; width: 56px; height: 56px; display: grid; place-items: center; background: var(--fog); border-radius: 14px; margin-bottom: 20px; }
.cap h3 { font-size: 20px; margin-bottom: 10px; }
.cap p { font-size: 15px; color: var(--muted); }

/* ============ 6. 学校能力（深底反差） ============ */
.school { background: linear-gradient(165deg, #1a2534 0%, #233145 100%); position: relative; }
.school::before { content:""; position:absolute; inset:0; background:radial-gradient(50% 60% at 85% 15%, rgba(245,196,81,.10), transparent 60%); pointer-events:none; }
.school .container { position: relative; z-index: 1; }
.school-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.scard {
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-lg); padding: 34px 34px;
  transition: transform .3s ease, background .3s ease, border-color .3s;
}
.scard:hover { transform: translateY(-5px); background: rgba(255,255,255,.07); border-color: rgba(245,196,81,.4); }
.scard__k {
  display: inline-block; font-family: var(--serif); font-weight: 700; font-size: 14px; letter-spacing: 3px;
  color: var(--ink); background: var(--gold-lite); padding: 4px 14px; border-radius: 6px; margin-bottom: 18px;
}
.scard h3 { font-size: 21px; color: #fff; margin-bottom: 10px; }
.scard p { font-size: 15px; color: #aab7c8; }

/* ============ 7. 技术内核 ============ */
.tech { background: var(--fog); border-top: 1px solid var(--line); }
.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.tcard {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 34px 36px; display: flex; flex-direction: column;
  transition: transform .3s ease, box-shadow .3s ease;
}
.tcard:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.tcard h3 { font-size: 21px; display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.tcard__idx {
  flex: none; width: 40px; height: 40px; display: grid; place-items: center;
  font-family: var(--serif); font-weight: 900; font-size: 18px; color: var(--gold);
  border: 1.5px solid var(--gold-wash); border-radius: 10px; background: #fdf8ee;
}
.tcard p { font-size: 15.5px; color: var(--muted); }

/* ============ 宣传片 ============ */
.film { background: linear-gradient(165deg, #16202e 0%, #1e293b 55%, #22303f 100%); position: relative; overflow: hidden; }
.film::before { content:""; position:absolute; inset:0; background:radial-gradient(55% 60% at 82% 12%, rgba(245,196,81,.12), transparent 60%); pointer-events:none; }
.film .container { position: relative; z-index: 1; }
.film-stage {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid rgba(245,196,81,.22);
  box-shadow: 0 40px 90px -40px rgba(0,0,0,.7), 0 0 0 1px rgba(255,255,255,.03) inset;
  background: #000; aspect-ratio: 16 / 9;
}
.film-video { display: block; width: 100%; height: 100%; object-fit: cover; background: #000; }
.film-note { text-align: center; margin-top: 22px; font-size: 14px; color: #93a1b4; letter-spacing: .5px; }

/* ============ 产品界面实拍 ============ */
.shots { background: var(--paper); }
.shot-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.shot {
  border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden;
  background: var(--paper); box-shadow: var(--shadow-sm);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
.shot:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #c9d4e2; }
.shot__bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 16px; background: var(--slate); border-bottom: 1px solid rgba(255,255,255,.06);
}
.shot__bar span { width: 10px; height: 10px; border-radius: 50%; background: #46586f; }
.shot__bar span:nth-child(1) { background: #e06a5a; }
.shot__bar span:nth-child(2) { background: #e3b341; }
.shot__bar span:nth-child(3) { background: #4f9d76; }
.shot__bar em { margin-left: 10px; font-style: normal; font-size: 13px; color: #aeb9c8; letter-spacing: .5px; }
.shot img { display: block; width: 100%; height: auto; border-bottom: 1px solid var(--line); background: var(--fog); }
.shot figcaption { padding: 20px 24px; font-size: 15px; color: var(--muted); }
.shot figcaption strong { color: var(--slate); font-weight: 700; }

/* ============ 页脚 ============ */
.footer { background: var(--ink); color: #cdd6e2; }
.footer__inner { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; padding: 84px 0 56px; align-items: center; }
.footer__cta h2 { font-size: clamp(24px, 3vw, 34px); color: #fff; }
.footer__cta p { margin-top: 16px; color: #93a1b4; font-size: 16px; }
.footer__info { display: flex; flex-direction: column; gap: 18px; border-left: 1px solid rgba(255,255,255,.12); padding-left: 40px; }
.finfo { display: flex; flex-direction: column; gap: 4px; }
.finfo__k { font-size: 13px; letter-spacing: 2px; color: var(--gold-lite); }
.finfo__v { font-size: 18px; color: #eef2f7; font-family: var(--serif); }
.footer__bar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding: 24px 28px; border-top: 1px solid rgba(255,255,255,.1);
  max-width: var(--maxw); margin: 0 auto;
}
.brand--sm { font-size: 15px; color: #cdd6e2; }
.footer__copy { font-size: 13px; color: #7e8da0; }

/* ============ 滚动渐显动画 ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); transition-delay: var(--d, 0s); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .hero__scroll span { animation: none; }
}

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .nav__links { display: none; }
  .pain-grid, .cap-grid, .tech-grid, .school-grid { grid-template-columns: 1fr 1fr; }
  .flowline { grid-template-columns: repeat(2, 1fr); }
  .flownode:not(:nth-child(4n))::after { display: none; }
  .flownode:not(:nth-child(2n)):not(:last-child)::after { content:"→"; display:block; right:-13px; }
  .dual { grid-template-columns: 1fr; gap: 20px; }
  .dual__link span { writing-mode: horizontal-tb; border: none; border-top: 1px dashed var(--line); border-bottom: 1px dashed var(--line); width: 100%; text-align: center; }
  .footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .footer__info { border-left: none; padding-left: 0; border-top: 1px solid rgba(255,255,255,.12); padding-top: 28px; }
}
@media (max-width: 620px) {
  .container { padding: 0 20px; }
  .section { padding: 72px 0; }
  .pain-grid, .cap-grid, .tech-grid, .school-grid, .flowline, .shot-grid { grid-template-columns: 1fr; }
  .flownode::after { display: none !important; }
  .hero__inner { padding: 104px 0 80px; }
  .hero__stats { gap: 18px; flex-wrap: wrap; }
  .stat__num { font-size: 32px; }
  .sec-head { margin-bottom: 40px; }
}