/*
  九仞数据科技有限公司 — 单页站点样式
  设计要点：沉浸式深色背景、霓虹渐变、玻璃拟态卡片、柔和动效
*/

:root {
  --bg: #0b1020;
  --panel: rgba(255,255,255,0.06);
  --panel-border: rgba(255,255,255,0.10);
  --muted: rgba(255,255,255,0.70);
  --text: #f3f6ff;
  --primary: #7c9aff;
  --primary-2: #8d67ff;
  --accent: #00e3ff;
  --ok: #29d391;
  --warn: #ffcc66;
  --container: 1120px;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--text); background: var(--bg);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
}

.bg {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(1200px 600px at 10% 0%, rgba(124,154,255,.25), transparent 70%),
    radial-gradient(800px 400px at 90% 10%, rgba(141,103,255,.25), transparent 70%),
    radial-gradient(600px 300px at 20% 100%, rgba(0,227,255,.18), transparent 70%),
    linear-gradient(180deg, #0b1020 0%, #0b0f1a 60%, #0a0d18 100%);
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; position: relative; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.00)); }

.site-header {
  position: sticky; top: 0; z-index: 20; backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(11,16,32,.85), rgba(11,16,32,.35));
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.logo-mark {
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  font-weight: 800; letter-spacing: .5px; text-shadow: 0 1px 0 rgba(0,0,0,.2);
}
.logo.small .logo-mark { width: 24px; height: 24px; font-size: 12px; }
.logo-text { font-weight: 700; }

.nav-links { display: flex; align-items: center; gap: 16px; }
.nav-links a { color: var(--muted); text-decoration: none; padding: 8px 10px; border-radius: 8px; }
.nav-links a:hover { color: #fff; background: rgba(255,255,255,.06); }

.nav-toggle { display: none; background: transparent; border: 0; padding: 6px; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: #c9d1ff; transition: .2s; }

/* Buttons */
.btn { --h: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: var(--h); padding: 0 16px; border-radius: 999px; border: 1px solid rgba(255,255,255,.10);
  color: #fff; text-decoration: none; background: rgba(255,255,255,.04); transition: transform .15s ease, background .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-1px); background: rgba(255,255,255,.08); }
.btn:active { transform: translateY(0); }
.btn-sm { --h: 36px; padding: 0 12px; font-size: 14px; }
.btn-lg { --h: 52px; padding: 0 22px; font-size: 16px; font-weight: 600; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-color: transparent; box-shadow: 0 10px 30px rgba(124,154,255,.25);
}
.btn-primary:hover { box-shadow: 0 12px 34px rgba(124,154,255,.35); }
.btn-outline { background: transparent; border-color: rgba(255,255,255,.18); }
.btn-ghost { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.10); }

/* Hero */
.hero { padding-top: 56px; padding-bottom: 40px; }
.hero-inner { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: center; }
.headline { font-size: clamp(28px, 5vw, 46px); line-height: 1.15; margin: 0 0 16px; letter-spacing: .2px; }
.subhead { margin: 0 0 24px; color: var(--muted); font-size: 16px; }
.cta { display: flex; gap: 12px; margin: 8px 0 20px; }
.hero-highlights { list-style: none; padding: 0; margin: 12px 0 0; color: var(--muted); display: grid; gap: 8px; }
.badge { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: rgba(255,255,255,.10); color: #dfe7ff; margin-right: 6px; border: 1px solid rgba(255,255,255,.12); }

.hero-art { position: relative; min-height: 380px; }
.hero-art .hero-ill { width: 100%; height: auto; display: block; }
/* 若仍需氛围光球，可保留以下两行，将不再使用模糊网格背景，避免模糊感 */
.orb { position: absolute; border-radius: 999px; filter: blur(18px); opacity: .75; animation: float 8s ease-in-out infinite; }
.orb-1 { width: 220px; height: 220px; right: -20px; top: 10px; background: radial-gradient(circle at 30% 30%, var(--primary), transparent 60%); }
.orb-2 { width: 160px; height: 160px; left: -10px; bottom: 10px; animation-delay: -2s; background: radial-gradient(circle at 60% 40%, var(--accent), transparent 60%); }

@keyframes float { 0%,100%{ transform: translateY(0)} 50%{ transform: translateY(-12px)} }

/* Sections & cards */
.section-header { text-align: center; margin-bottom: 20px; }
.section-header h2 { margin: 0 0 8px; font-size: clamp(22px, 3.6vw, 32px); }
.section-header p { margin: 0; color: var(--muted); }

.cards { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; align-items: stretch; }
.cards.four { grid-template-columns: repeat(4, minmax(0,1fr)); }

.card {
  position: relative; padding: 22px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border); box-shadow: var(--shadow);
  overflow: hidden; transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,.18); }
.card .muted { color: var(--muted); }
.card-head { 
  display: grid; 
  grid-template-columns: 48px 1fr; 
  grid-template-areas: 'icon title' 'icon desc'; 
  gap: 12px; 
  align-items: start; 
  margin-bottom: 10px; 
}
.card .icon { 
  grid-area: icon; 
  width: 40px; height: 40px; display: grid; place-items: center; border-radius: 12px; color: #dfe7ff; 
}
.card .icon svg { width: 26px; height: 26px; }
.card .icon.ai { background: linear-gradient(135deg, rgba(124,154,255,.4), rgba(141,103,255,.35)); }
.card .icon.analytics { background: linear-gradient(135deg, rgba(0,227,255,.35), rgba(124,154,255,.35)); }
.card.mini { text-align: left; }
.card.mini .icon { width: 36px; height: 36px; border-radius: 10px; }
.card.mini h3 { margin: 10px 0 6px; font-size: 18px; }
.card.mini p { margin: 0; color: var(--muted); }

/* 防止中文标题竖排或逐字断行，确保横向展示 */
.card-head h3 { 
  grid-area: title; 
  margin: 0 0 2px; 
  font-size: 20px; 
  font-weight: 700; 
  color: #fff; 
  writing-mode: horizontal-tb; 
  text-orientation: mixed; 
  min-width: 0; 
}
.card-head p { 
  grid-area: desc; 
  writing-mode: horizontal-tb; 
  text-orientation: mixed; 
  min-width: 0; 
}

@media (max-width: 720px) {
  .card-head { grid-template-columns: 40px 1fr; gap: 10px; }
  .card-head h3 { font-size: 18px; }
}

.feature-list { margin: 8px 0 12px; padding-left: 18px; }
.feature-list li { margin: 6px 0; }
.card-cta { margin-top: 12px; }

/* 使产品卡片的描述、列表与按钮和标题左对齐 */
.card.product { --icon-col: 48px; --head-gap: 12px; --li-indent: 18px; }
.card.product .feature-list { margin-left: calc(var(--icon-col) + var(--head-gap) - var(--li-indent)); }
.card.product .card-cta { margin-left: calc(var(--icon-col) + var(--head-gap)); }

/* Steps */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; list-style: none; padding: 0; margin: 0; }
.steps li { background: var(--panel); border: 1px solid var(--panel-border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.step-index { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 999px; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent)); margin-bottom: 8px; }
.steps h3 { margin: 0 0 6px; font-size: 18px; }
.steps p { margin: 0; color: var(--muted); }

/* KPI */
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; }
.kpi { background: var(--panel); border: 1px solid var(--panel-border); border-radius: 14px; padding: 16px; text-align: center; }
.kpi-value { font-size: 28px; font-weight: 800; letter-spacing: .5px; }
.kpi-label { color: var(--muted); }
.mini-chart { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; height: 96px; align-items: end; margin-top: 16px; }
.mini-chart .bar { height: var(--v); background: linear-gradient(180deg, var(--accent), rgba(0,227,255,.2)); border-radius: 6px; box-shadow: 0 6px 18px rgba(0,227,255,.2); }

/* Contact */
.contact .contact-wrap { display: grid; grid-template-columns: 1.2fr .8fr; gap: 20px; align-items: stretch; }
.form { background: var(--panel); border: 1px solid var(--panel-border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.grid-form { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
.grid-form .full { grid-column: 1 / -1; }
.form label { display: grid; gap: 6px; font-size: 14px; color: #e9edff; }
.form input, .form textarea { width: 100%; color: #fff; background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.14);
  border-radius: 10px; padding: 10px 12px; outline: none; transition: border-color .2s ease, box-shadow .2s ease; }
.form input::placeholder, .form textarea::placeholder { color: rgba(255,255,255,.45); }
.form input:focus, .form textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(124,154,255,.22); }
.form-note { margin: 10px 0 0; color: var(--muted); font-size: 13px; }

/* 联系我们：增大提交按钮与上方表单的间距 */
#contact-form button[type="submit"] { margin-top: 16px; }

.contact .form, .contact .contact-info { height: 100%; }
.contact-info { padding: 18px; border-radius: var(--radius); border: 1px solid var(--panel-border); background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02)); box-shadow: var(--shadow); }
.contact-info h3 { margin: 0 0 8px; }
.contact-info h4 { margin: 14px 0 8px; font-size: 15px; color: #e9edff; font-weight: 600; }
.contact-info ul { margin: 0 0 8px 18px; color: var(--muted); }
.contact-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.contact-badges.partners .badge { background: rgba(255,255,255,.08); }

/* Footer */
.site-footer { border-top: 1px solid rgba(255,255,255,.06); padding: 24px 0; background: linear-gradient(to top, rgba(11,16,32,.8), rgba(11,16,32,.5)); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.foot-left { display: grid; gap: 6px; }
.foot-right { display: flex; gap: 12px; }
.foot-right a { color: var(--muted); text-decoration: none; padding: 6px 8px; border-radius: 8px; }
.foot-right a:hover { color: #fff; background: rgba(255,255,255,.06); }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 980px) {
  .section { padding: 56px 0; }
  .hero { padding-top: 48px; padding-bottom: 32px; }
  .hero-inner { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .cards.four { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .kpis { grid-template-columns: repeat(2, 1fr); }
  .contact .contact-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .section { padding: 48px 0; }
  .nav-links { display: none; position: absolute; right: 16px; top: 60px; background: rgba(11,16,32,.95); padding: 10px; border-radius: 12px; border: 1px solid rgba(255,255,255,.08); flex-direction: column; min-width: 180px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: inline-block; }
}

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

/* Toast 提示 */
.toast {
  position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%) translateY(8px);
  z-index: 1000; padding: 12px 16px; border-radius: 12px;
  color: var(--text); background: rgba(20, 26, 46, 0.85);
  border: 1px solid rgba(255,255,255,.1); box-shadow: 0 10px 30px rgba(0,0,0,.35);
  opacity: 0; pointer-events: none; transition: opacity .25s ease, transform .25s ease;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }