/* ============================================================
   星石 AI · STARSTONE AI
   设计系统 / Design System v1.0
   深空蓝科技感 + 白底克制排版
   ============================================================ */

:root {
  /* 文本 */
  --ink:        #0B1B2B;
  --ink-2:      #22384E;
  --muted:      #6B7C90;
  --muted-2:    #93A2B3;
  --white:      #FFFFFF;

  /* 表面 */
  --bg:         #FFFFFF;
  --bg-soft:    #F5F8FC;
  --bg-tint:    #EEF5FD;
  --line:       #E4ECF4;
  --line-soft:  #EFF4F9;

  /* 主题色（统一冷色系，不使用杂色） */
  --blue:       #0A84FF;
  --blue-deep:  #0A4FBF;
  --blue-ink:   #0759B0;
  --cyan:       #22D3EE;
  --violet:     #6E5BFF;

  /* 深空 */
  --navy-0:     #06182D;
  --navy-1:     #0A3259;
  --navy-2:     #0A5A8F;
  --navy-line:  rgba(255,255,255,.13);

  /* 阴影 / 圆角 */
  --shadow-xs:  0 2px 8px rgba(11, 50, 90, .04);
  --shadow-sm:  0 6px 18px rgba(11, 50, 90, .055);
  --shadow-md:  0 14px 40px rgba(11, 50, 90, .09);
  --shadow-lg:  0 28px 70px rgba(6, 24, 45, .16);
  --glow:       0 14px 38px rgba(10, 132, 255, .24);
  --r-sm:       10px;
  --r-md:       16px;
  --r-lg:       22px;
  --r-xl:       28px;

  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max: 1200px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font-family: inherit; }
button { cursor: pointer; border: 0; background: none; color: inherit; }
svg { display: block; }
::selection { background: rgba(10,132,255,.18); color: var(--ink); }

/* 图标 sprite 与使用约定 */
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.i { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }

.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.section { padding: 108px 0; }
.section--soft { background: var(--bg-soft); }
.section--tight { padding: 76px 0; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- 文本层级 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono);
  font-size: 11.5px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--blue-ink); font-weight: 600;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: currentColor; opacity: .55; }
.eyebrow--light { color: #8CD4FF; }
.eyebrow--center::after { content: ""; width: 18px; height: 1px; background: currentColor; opacity: .55; }

h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -.025em; line-height: 1.24; }
.h1 { font-size: clamp(42px, 5.4vw, 68px); letter-spacing: -.045em; line-height: 1.12; }
.h2 { font-size: clamp(30px, 3.6vw, 44px); letter-spacing: -.038em; }
.h3 { font-size: 20px; letter-spacing: -.02em; line-height: 1.4; }
.lead { font-size: 18px; line-height: 1.85; color: var(--muted); }
.body-sm { font-size: 14.5px; line-height: 1.8; color: var(--muted); }
.center { text-align: center; }

.section-head { max-width: 720px; margin: 0 auto 62px; text-align: center; }
.section-head .h2 { margin: 18px 0 18px; }
.section-head .lead { margin: 0 auto; max-width: 620px; }
.section-head .eyebrow { justify-content: center; }

.grad-rule { width: 44px; height: 3px; border-radius: 3px; margin: 26px auto 0; background: linear-gradient(90deg, var(--blue), var(--cyan)); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 48px; padding: 0 24px; border-radius: 12px;
  font-size: 15px; font-weight: 600; letter-spacing: .01em;
  transition: transform .22s ease, box-shadow .22s ease, background .22s ease, border-color .22s ease;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; }
.btn:hover { transform: translateY(-2px); }
.btn--primary { color: #fff; background: linear-gradient(135deg, #1289FF 0%, #0A5FD6 58%, #0A4FBF 100%); box-shadow: var(--glow); }
.btn--primary:hover { box-shadow: 0 18px 44px rgba(10,132,255,.34); }
.btn--ghost { color: var(--ink); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-xs); }
.btn--ghost:hover { border-color: #C7DAF2; box-shadow: var(--shadow-sm); }
.btn--outline-light { color: #fff; border: 1px solid rgba(255,255,255,.28); background: rgba(255,255,255,.06); }
.btn--outline-light:hover { background: rgba(255,255,255,.13); border-color: rgba(255,255,255,.45); }
.btn--light { color: var(--navy-0); background: #fff; box-shadow: 0 12px 30px rgba(2,12,24,.22); }
.btn--sm { height: 40px; padding: 0 18px; font-size: 14px; border-radius: 10px; }
.btn--lg { height: 54px; padding: 0 30px; font-size: 16px; border-radius: 13px; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: .5; pointer-events: none; }

.text-link { display: inline-flex; align-items: center; gap: 7px; color: var(--blue-ink); font-size: 15px; font-weight: 600; }
.text-link svg { width: 16px; height: 16px; transition: transform .2s ease; }
.text-link:hover svg { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 90;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease, background .25s ease;
}
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: 0 4px 22px rgba(11,50,90,.055); background: rgba(255,255,255,.97); }
.nav-inner { height: 72px; display: flex; align-items: center; gap: 40px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand-mark { width: 34px; height: 34px; }
.brand-name { font-size: 19px; font-weight: 750; letter-spacing: -.02em; }
.brand-name span { color: var(--blue); }
.brand-en { font-family: var(--mono); font-size: 9.5px; letter-spacing: .22em; color: var(--muted-2); margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 32px; margin-left: 12px; }
.nav-links a { font-size: 14.5px; color: var(--ink-2); font-weight: 500; transition: color .2s ease; position: relative; }
.nav-links a:hover, .nav-links a.is-active { color: var(--blue-ink); }
.nav-links a.is-active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -25px; height: 2px; background: var(--blue); border-radius: 2px; }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.nav-login { font-size: 14.5px; color: var(--ink-2); font-weight: 500; }
.nav-login:hover { color: var(--blue-ink); }
.nav-toggle { display: none; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--line); align-items: center; justify-content: center; }
.nav-toggle svg { width: 20px; height: 20px; }
.mobile-menu { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  padding: 78px 0 0;
  background:
    radial-gradient(900px 520px at 50% -8%, rgba(34,211,238,.20), transparent 68%),
    radial-gradient(760px 480px at 82% 28%, rgba(10,132,255,.20), transparent 70%),
    linear-gradient(160deg, #06182D 0%, #0A3259 48%, #0A5A8F 100%);
  color: #fff;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; opacity: .28;
  background-image: linear-gradient(rgba(255,255,255,.075) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.075) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.85), rgba(0,0,0,.12) 78%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,.85), rgba(0,0,0,.12) 78%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(2px 2px at 12% 22%, rgba(255,255,255,.6), transparent 100%),
              radial-gradient(2px 2px at 28% 62%, rgba(255,255,255,.35), transparent 100%),
              radial-gradient(1.5px 1.5px at 76% 18%, rgba(255,255,255,.55), transparent 100%),
              radial-gradient(2px 2px at 88% 55%, rgba(140,212,255,.5), transparent 100%),
              radial-gradient(1.5px 1.5px at 62% 76%, rgba(255,255,255,.3), transparent 100%),
              radial-gradient(1.5px 1.5px at 42% 12%, rgba(255,255,255,.4), transparent 100%);
}
.hero-copy { max-width: 850px; margin: 0 auto; text-align: center; }
.hero-copy .h1 { margin: 18px 0 20px; }
.hero-copy .h1 em { font-style: normal; color: #8CD4FF; }
.hero-copy .lead { color: rgba(255,255,255,.74); font-size: 18.5px; max-width: 660px; margin: 0 auto; }
.hero-cta { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.hero-note { margin-top: 20px; font-family: var(--mono); font-size: 12px; letter-spacing: .04em; color: rgba(255,255,255,.5); }
.hero-note b { color: #8CD4FF; font-weight: 600; }

.hero-stats { display: flex; justify-content: center; gap: 0; margin: 46px auto 0; max-width: 720px; }
.hero-stat { flex: 1; text-align: center; padding: 0 18px; border-left: 1px solid rgba(255,255,255,.14); }
.hero-stat:first-child { border-left: 0; }
.hero-stat .num { font-family: var(--mono); font-size: 27px; font-weight: 700; color: #fff; letter-spacing: -.02em; }
.hero-stat .num small { font-size: 14px; color: #8CD4FF; margin-left: 2px; }
.hero-stat .lbl { font-size: 12.5px; color: rgba(255,255,255,.55); margin-top: 2px; }

/* 工作台展示面板 */
.workbench-wrap { position: relative; margin-top: 52px; padding-bottom: 0; }
.workbench {
  position: relative; max-width: 1080px; margin: 0 auto;
  background: #fff; border-radius: var(--r-xl) var(--r-xl) 0 0;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,.18);
  overflow: hidden; color: var(--ink);
}
.wb-top { height: 52px; display: flex; align-items: center; gap: 14px; padding: 0 20px; border-bottom: 1px solid var(--line-soft); background: #FCFDFE; }
.wb-dots { display: flex; gap: 6px; }
.wb-dots i { width: 9px; height: 9px; border-radius: 50%; background: #DCE5EF; }
.wb-dots i:nth-child(1) { background: #FFD7D2; }
.wb-dots i:nth-child(2) { background: #FFE9BE; }
.wb-dots i:nth-child(3) { background: #C8EBD6; }
.wb-file { font-family: var(--mono); font-size: 11.5px; color: var(--muted); }
.wb-file b { color: var(--ink-2); font-weight: 600; }
.wb-top-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.wb-chip { font-family: var(--mono); font-size: 10.5px; color: var(--blue-ink); background: var(--bg-tint); padding: 5px 10px; border-radius: 6px; }
.wb-main { display: flex; min-height: 420px; }
.wb-tools { width: 62px; flex-shrink: 0; border-right: 1px solid var(--line-soft); padding: 16px 0; display: flex; flex-direction: column; align-items: center; gap: 8px; background: #FCFDFE; }
.wb-tool { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; color: var(--muted-2); }
.wb-tool svg { width: 18px; height: 18px; }
.wb-tool.is-on { background: var(--bg-tint); color: var(--blue); }
.wb-canvas { flex: 1; min-width: 0; position: relative; background: #0E2237; }
.wb-side { width: 248px; flex-shrink: 0; border-left: 1px solid var(--line-soft); padding: 22px 20px; background: #fff; }
.wb-side h4 { font-size: 13px; letter-spacing: .01em; }
.wb-side .sub { font-size: 11.5px; color: var(--muted-2); margin: 3px 0 22px; }
.wb-param { margin-bottom: 20px; }
.wb-param .row { display: flex; justify-content: space-between; align-items: baseline; font-size: 12.5px; color: var(--ink-2); margin-bottom: 9px; }
.wb-param .row b { font-family: var(--mono); font-size: 11.5px; color: var(--blue-ink); font-weight: 600; }
.wb-bar { height: 4px; border-radius: 4px; background: var(--line); overflow: hidden; }
.wb-bar i { display: block; height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--blue), var(--cyan)); }
.wb-side-card { margin-top: 24px; padding: 14px; border-radius: 12px; background: var(--bg-soft); border: 1px solid var(--line-soft); font-size: 11.5px; color: var(--muted); line-height: 1.65; }
.wb-side-card b { color: var(--ink-2); }
.wb-bottom { height: 44px; display: flex; align-items: center; gap: 22px; padding: 0 20px; border-top: 1px solid var(--line-soft); background: #FCFDFE; font-family: var(--mono); font-size: 11px; color: var(--muted); }
.wb-bottom .dot { width: 6px; height: 6px; border-radius: 50%; background: #22C58B; box-shadow: 0 0 0 4px rgba(34,197,139,.14); }
.wb-bottom .right { margin-left: auto; color: var(--blue-ink); }

/* ---------- 前后对比滑块 ---------- */
.compare { position: relative; width: 100%; height: 100%; min-height: 420px; overflow: hidden; user-select: none; }
.compare img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 38%; }
.compare .after { z-index: 1; }
.compare .before-layer { position: absolute; inset: 0; z-index: 2; overflow: hidden; width: 50%; }
.compare .before-layer img { width: 100%; height: 100%; object-fit: cover; object-position: center 38%; filter: saturate(.42) contrast(.82) brightness(.78) blur(.7px); }
/* before 图需按整体宽度定位，避免随裁切宽度缩放 */
.compare .before-layer img { width: var(--cmp-w, 100%); max-width: none; }
.compare .overlay-gray { position: absolute; inset: 0; background: rgba(24,42,60,.16); mix-blend-mode: multiply; }
.compare-tag { position: absolute; top: 16px; z-index: 5; font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; color: #fff; padding: 6px 11px; border-radius: 6px; background: rgba(6,24,45,.62); border: 1px solid rgba(255,255,255,.18); }
.compare-tag--before { left: 16px; }
.compare-tag--after { right: 16px; background: rgba(10,84,191,.82); border-color: rgba(140,212,255,.4); }
.compare-divider { position: absolute; top: 0; bottom: 0; left: 50%; width: 2px; z-index: 6; background: rgba(255,255,255,.92); box-shadow: 0 0 14px rgba(10,132,255,.7); pointer-events: none; }
.compare-handle { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); z-index: 7; width: 46px; height: 46px; border-radius: 50%; background: #fff; box-shadow: 0 6px 22px rgba(6,24,45,.35); display: grid; place-items: center; color: var(--blue-ink); pointer-events: none; }
.compare-handle svg { width: 21px; height: 21px; }
.compare input[type=range] { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 8; opacity: 0; cursor: ew-resize; margin: 0; }
.compare.is-small { min-height: 300px; border-radius: var(--r-md); }

/* ---------- 信任条 ---------- */
.trust { border-bottom: 1px solid var(--line); background: #fff; padding: 30px 0; }
.trust-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.trust-label { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; color: var(--muted-2); text-transform: uppercase; white-space: nowrap; }
.trust-logos { display: flex; align-items: center; gap: 46px; flex-wrap: wrap; }
.trust-logo { display: inline-flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 650; color: #7D8DA0; letter-spacing: -.01em; }
.trust-logo svg { width: 20px; height: 20px; opacity: .8; }

/* ---------- 能力卡片 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { padding: 32px 28px 30px; border-radius: var(--r-lg); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-xs); transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; position: relative; overflow: hidden; }
.feature-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--blue), var(--cyan)); opacity: 0; transition: opacity .25s ease; }
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #D3E3F7; }
.feature-card:hover::before { opacity: 1; }
.feature-icon { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; background: var(--bg-tint); color: var(--blue-ink); margin-bottom: 22px; }
.feature-icon svg { width: 23px; height: 23px; }
.feature-card .h3 { margin-bottom: 10px; }
.feature-card p { margin: 0; font-size: 14.5px; line-height: 1.8; color: var(--muted); }
.feature-meta { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line-soft); display: flex; align-items: center; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: var(--muted-2); }
.feature-meta b { color: var(--blue-ink); font-weight: 600; }

/* ---------- 工作流 ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.flow-step { padding: 0 26px; position: relative; }
.flow-step:first-child { padding-left: 0; }
.flow-step:last-child { padding-right: 0; }
.flow-step::after { content: ""; position: absolute; top: 22px; right: 0; width: calc(100% - 52px); height: 1px; background: linear-gradient(90deg, var(--line), #C9DDF5); }
.flow-step:last-child::after { display: none; }
.flow-num { position: relative; z-index: 2; width: 44px; height: 44px; border-radius: 13px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-xs); display: grid; place-items: center; font-family: var(--mono); font-size: 14px; font-weight: 700; color: var(--blue-ink); margin-bottom: 22px; }
.flow-step .h3 { font-size: 18px; margin-bottom: 9px; }
.flow-step p { font-size: 14px; color: var(--muted); margin: 0; }

/* ---------- 画廊 ---------- */
.gallery { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 18px; }
.gallery-item { position: relative; border-radius: var(--r-lg); overflow: hidden; background: var(--bg-soft); aspect-ratio: 4 / 3.4; }
.gallery-item:first-child { aspect-ratio: 4 / 3.4; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.3,1); }
.gallery-item:hover img { transform: scale(1.055); }
.gallery-item::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(6,24,45,.78), rgba(6,24,45,0) 58%); }
.gallery-cap { position: absolute; left: 22px; right: 22px; bottom: 20px; z-index: 2; color: #fff; }
.gallery-cap .k { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; color: #8CD4FF; }
.gallery-cap .t { font-size: 17px; font-weight: 650; margin-top: 3px; }
.gallery-cap .d { font-size: 12.5px; color: rgba(255,255,255,.7); margin-top: 3px; }
.gallery-badge { position: absolute; top: 16px; left: 16px; z-index: 2; font-family: var(--mono); font-size: 10.5px; color: #fff; background: rgba(6,24,45,.55); border: 1px solid rgba(255,255,255,.2); padding: 5px 10px; border-radius: 6px; }

/* ---------- 数据 band ---------- */
.band { position: relative; overflow: hidden; border-radius: var(--r-xl); padding: 62px 56px; color: #fff; background: linear-gradient(135deg, #06182D 0%, #0A3259 55%, #0A5A8F 100%); box-shadow: var(--shadow-md); }
.band::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px); background-size: 52px 52px; opacity: .8; }
.band::after { content: ""; position: absolute; width: 460px; height: 460px; right: -140px; top: -220px; border-radius: 50%; background: radial-gradient(circle, rgba(34,211,238,.22), transparent 68%); }
.band-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1.5fr; gap: 60px; align-items: center; }
.band h2 { font-size: clamp(26px, 2.8vw, 36px); }
.band p { color: rgba(255,255,255,.68); font-size: 15px; margin: 14px 0 0; max-width: 340px; }
.band-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.band-metric .n { font-family: var(--mono); font-size: clamp(28px, 3.2vw, 40px); font-weight: 700; letter-spacing: -.04em; color: #fff; }
.band-metric .n small { font-size: 16px; color: #8CD4FF; }
.band-metric .l { font-size: 13px; color: rgba(255,255,255,.6); margin-top: 4px; }

/* ---------- 场景 / 客户声音 ---------- */
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.quote-card { padding: 28px; border-radius: var(--r-lg); border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow-xs); }
.quote-card .stars { display: flex; gap: 3px; color: var(--blue); margin-bottom: 18px; }
.quote-card .stars svg { width: 15px; height: 15px; }
.quote-card p { font-size: 15px; line-height: 1.85; color: var(--ink-2); margin: 0 0 22px; }
.quote-author { display: flex; align-items: center; gap: 12px; padding-top: 18px; border-top: 1px solid var(--line-soft); }
.quote-avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; background: var(--bg-tint); color: var(--blue-ink); font-size: 14px; font-weight: 700; }
.quote-author .n { font-size: 13.5px; font-weight: 650; }
.quote-author .r { font-size: 12px; color: var(--muted-2); }

/* ---------- FAQ ---------- */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.faq-item { padding: 26px 28px; border-radius: var(--r-md); background: #fff; border: 1px solid var(--line); }
.faq-item .q { display: flex; gap: 12px; align-items: baseline; font-size: 16px; font-weight: 650; margin-bottom: 10px; }
.faq-item .q i { font-family: var(--mono); font-style: normal; font-size: 12px; color: var(--blue); }
.faq-item .a { font-size: 14px; color: var(--muted); line-height: 1.85; margin: 0; padding-left: 28px; }

/* ---------- CTA ---------- */
.cta { position: relative; overflow: hidden; text-align: center; color: #fff; padding: 96px 0; background: linear-gradient(150deg, #06182D 0%, #0A3259 52%, #0A5A8F 100%); }
.cta::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px); background-size: 64px 64px; mask-image: radial-gradient(circle at 50% 40%, #000, transparent 78%); -webkit-mask-image: radial-gradient(circle at 50% 40%, #000, transparent 78%); }
.cta::after { content: ""; position: absolute; width: 620px; height: 620px; left: 50%; top: -330px; transform: translateX(-50%); border-radius: 50%; background: radial-gradient(circle, rgba(34,211,238,.2), transparent 65%); }
.cta-inner { position: relative; z-index: 2; }
.cta h2 { font-size: clamp(30px, 4vw, 48px); margin: 18px 0 18px; }
.cta p { color: rgba(255,255,255,.72); font-size: 17px; margin: 0 auto 34px; max-width: 560px; }
.cta .eyebrow { justify-content: center; }
.cta-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: #06182D; color: #fff; padding: 72px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 46px; padding-bottom: 54px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { color: rgba(255,255,255,.52); font-size: 14px; line-height: 1.85; max-width: 290px; margin: 20px 0 0; }
.footer-col h5 { margin: 0 0 18px; font-size: 13.5px; font-weight: 650; letter-spacing: .02em; }
.footer-col a { display: block; color: rgba(255,255,255,.55); font-size: 13.5px; margin-bottom: 12px; transition: color .2s ease; }
.footer-col a:hover { color: #8CD4FF; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding-top: 24px; font-size: 12.5px; color: rgba(255,255,255,.38); }
.footer-bottom .mono { font-size: 11.5px; letter-spacing: .04em; }

/* ---------- 内页通用 ---------- */
.page-hero { position: relative; overflow: hidden; padding: 84px 0 92px; background: linear-gradient(160deg, #06182D 0%, #0A3259 55%, #0A5A8F 100%); color: #fff; }
.page-hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px); background-size: 60px 60px; mask-image: linear-gradient(to bottom, #000, transparent 92%); -webkit-mask-image: linear-gradient(to bottom, #000, transparent 92%); opacity: .7; }
.page-hero::after { content: ""; position: absolute; width: 520px; height: 520px; right: -80px; top: -230px; border-radius: 50%; background: radial-gradient(circle, rgba(34,211,238,.2), transparent 68%); }
.page-hero .inner { position: relative; z-index: 2; max-width: 760px; }
.page-hero .h1 { font-size: clamp(36px, 4.6vw, 56px); margin: 20px 0 20px; }
.page-hero .lead { color: rgba(255,255,255,.72); font-size: 17.5px; max-width: 620px; }
.page-hero .hero-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 30px; }
.page-hero .hero-tags span { font-family: var(--mono); font-size: 11px; letter-spacing: .05em; color: #A9DCFF; border: 1px solid rgba(169,220,255,.28); background: rgba(255,255,255,.05); padding: 7px 12px; border-radius: 999px; }
.breadcrumb { display: flex; align-items: center; gap: 9px; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: rgba(255,255,255,.5); margin-bottom: 24px; }
.breadcrumb a:hover { color: #8CD4FF; }

/* ---------- 能力页 ---------- */
.cap-row { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; padding: 72px 0; border-bottom: 1px solid var(--line); }
.cap-row:last-child { border-bottom: 0; }
.cap-row.is-reverse .cap-visual { order: 2; }
.cap-row .idx { font-family: var(--mono); font-size: 12px; letter-spacing: .12em; color: var(--blue-ink); }
.cap-row h2 { font-size: clamp(26px, 2.8vw, 34px); margin: 16px 0 16px; }
.cap-row p { font-size: 16px; color: var(--muted); line-height: 1.9; margin: 0 0 24px; }
.cap-list { list-style: none; padding: 0; margin: 0 0 26px; }
.cap-list li { display: flex; align-items: flex-start; gap: 11px; font-size: 14.5px; color: var(--ink-2); margin-bottom: 11px; }
.cap-list li svg { width: 17px; height: 17px; color: var(--blue); flex-shrink: 0; margin-top: 4px; }
.cap-visual { border-radius: var(--r-xl); overflow: hidden; box-shadow: var(--shadow-md); border: 1px solid var(--line); background: #0E2237; }
.cap-visual img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3.1; }
.cap-visual.is-portrait img { aspect-ratio: 4 / 3.6; object-position: center 26%; }
.cap-visual-cap { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; background: #fff; font-family: var(--mono); font-size: 11px; color: var(--muted); }
.cap-visual-cap b { color: var(--blue-ink); }
.spec-table { width: 100%; border-collapse: collapse; border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.spec-table th, .spec-table td { padding: 17px 22px; text-align: left; border-bottom: 1px solid var(--line-soft); font-size: 14.5px; }
.spec-table th { background: var(--bg-soft); font-weight: 600; color: var(--ink-2); width: 28%; }
.spec-table td { color: var(--muted); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table .mono { color: var(--blue-ink); font-size: 13px; }

/* ---------- 定价页 ---------- */
#plans { padding-top: 76px; }
.pricing-controls { display: flex; flex-direction: column; align-items: center; margin-top: 4px; }
.pay-actions { display: flex; gap: 10px; margin-top: 12px; }
.pay-actions .btn { flex: 1; }
.billing-switch { display: inline-flex; align-items: center; gap: 4px; padding: 5px; border-radius: 14px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-xs); }
.billing-switch button { height: 40px; padding: 0 20px; border-radius: 10px; font-size: 14px; font-weight: 600; color: var(--muted); transition: all .22s ease; display: inline-flex; align-items: center; gap: 8px; }
.billing-switch button.is-on { background: linear-gradient(135deg, #1289FF, #0A4FBF); color: #fff; box-shadow: 0 6px 16px rgba(10,132,255,.22); }
.billing-switch .save { font-family: var(--mono); font-size: 10px; padding: 2px 7px; border-radius: 999px; background: rgba(34,197,139,.14); color: #0E9F6E; }
.billing-switch button.is-on .save { background: rgba(255,255,255,.2); color: #fff; }
.billing-hint { text-align: center; font-size: 13px; color: var(--muted-2); margin-top: 16px; }

.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; margin-top: 36px; }
.plan { position: relative; display: flex; flex-direction: column; padding: 32px 28px 30px; border-radius: var(--r-xl); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-xs); transition: transform .25s ease, box-shadow .25s ease; }
.plan:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.plan.is-featured { border: 1px solid transparent; background: linear-gradient(#fff, #fff) padding-box, linear-gradient(135deg, #1289FF, #22D3EE 70%, #6E5BFF) border-box; box-shadow: 0 18px 48px rgba(10,132,255,.16); }
.plan-badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; color: #fff; padding: 6px 14px; border-radius: 999px; background: linear-gradient(135deg, #1289FF, #0A4FBF); box-shadow: 0 6px 16px rgba(10,132,255,.28); white-space: nowrap; }
.plan-name { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; }
.plan-name svg { width: 21px; height: 21px; color: var(--blue); }
.plan-desc { font-size: 13.5px; color: var(--muted); margin: 8px 0 24px; min-height: 42px; line-height: 1.7; }
.plan-price { display: flex; align-items: baseline; gap: 6px; min-height: 62px; }
.plan-price .cur { font-size: 22px; font-weight: 700; color: var(--ink); }
.plan-price .amt { font-family: var(--mono); font-size: 46px; font-weight: 700; letter-spacing: -.055em; line-height: 1; color: var(--ink); }
.plan-price .per { font-size: 14px; color: var(--muted); }
.plan-price-sub { font-size: 12.5px; color: var(--muted-2); min-height: 22px; margin: 6px 0 22px; font-family: var(--mono); }
.plan .btn { margin-bottom: 26px; }
.plan-features { list-style: none; padding: 22px 0 0; margin: 0; border-top: 1px solid var(--line-soft); }
.plan-features li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: var(--ink-2); margin-bottom: 13px; line-height: 1.6; }
.plan-features li svg { width: 16px; height: 16px; color: var(--blue); flex-shrink: 0; margin-top: 3px; }
.plan-features li.is-off { color: var(--muted-2); }
.plan-features li.is-off svg { color: var(--muted-2); }
.plan-features li b { color: var(--blue-ink); font-weight: 650; }
.plan-foot { margin-top: auto; padding-top: 20px; font-family: var(--mono); font-size: 11px; color: var(--muted-2); }

.credit-strip { display: flex; align-items: center; gap: 22px; padding: 26px 30px; border-radius: var(--r-lg); border: 1px solid var(--line); background: var(--bg-soft); margin-top: 22px; flex-wrap: wrap; }
.credit-strip .icon { width: 46px; height: 46px; border-radius: 13px; background: #fff; border: 1px solid var(--line); display: grid; place-items: center; color: var(--blue-ink); flex-shrink: 0; }
.credit-strip .icon svg { width: 22px; height: 22px; }
.credit-strip .txt { flex: 1; min-width: 220px; }
.credit-strip .txt b { font-size: 15.5px; }
.credit-strip .txt p { margin: 3px 0 0; font-size: 13.5px; color: var(--muted); }

.compare-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-lg); background: #fff; box-shadow: var(--shadow-xs); }
.compare-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.compare-table th, .compare-table td { padding: 17px 22px; border-bottom: 1px solid var(--line-soft); text-align: center; font-size: 14px; }
.compare-table thead th { background: var(--bg-soft); font-weight: 650; color: var(--ink); font-size: 14.5px; }
.compare-table th:first-child, .compare-table td:first-child { text-align: left; color: var(--ink-2); width: 34%; font-weight: 500; }
.compare-table td { color: var(--muted); }
.compare-table tbody tr:last-child th, .compare-table tbody tr:last-child td { border-bottom: 0; }
.compare-table .yes { color: var(--blue-ink); font-weight: 600; font-family: var(--mono); font-size: 13px; }
.compare-table .no { color: var(--muted-2); }
.compare-table .col-hl { background: rgba(10,132,255,.035); }

/* ---------- 支付弹窗 ---------- */
.modal-mask { position: fixed; inset: 0; z-index: 200; background: rgba(6,24,45,.58); display: none; align-items: center; justify-content: center; padding: 24px; overflow-y: auto; }
.modal-mask.is-open { display: flex; }
.modal { width: min(480px, 100%); max-height: calc(100vh - 48px); overflow-y: auto; background: #fff; border-radius: var(--r-xl); box-shadow: 0 30px 90px rgba(6,24,45,.3); animation: modalIn .28s cubic-bezier(.2,.8,.3,1); }
@keyframes modalIn { from { opacity: 0; transform: translateY(16px) scale(.98); } to { opacity: 1; transform: none; } }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 24px 28px 0; }
.modal-head h3 { font-size: 20px; }
.modal-close { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; color: var(--muted); background: var(--bg-soft); }
.modal-close:hover { color: var(--ink); background: var(--line); }
.modal-close svg { width: 17px; height: 17px; }
.modal-body { padding: 22px 28px 28px; }
.modal-note { display: flex; gap: 9px; align-items: flex-start; padding: 11px 13px; border-radius: 10px; background: var(--bg-tint); font-size: 12.5px; color: var(--blue-ink); line-height: 1.6; margin-bottom: 20px; }
.modal-note svg { width: 15px; height: 15px; flex-shrink: 0; margin-top: 2px; }
.order-card { border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; }
.order-card .top { padding: 18px 20px; display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; background: var(--bg-soft); }
.order-card .top .n { font-size: 16px; font-weight: 700; }
.order-card .top .d { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.order-card .top .p { font-family: var(--mono); font-size: 22px; font-weight: 700; white-space: nowrap; }
.order-lines { padding: 8px 20px 16px; }
.order-line { display: flex; justify-content: space-between; gap: 14px; font-size: 13.5px; color: var(--muted); padding: 9px 0; }
.order-line b { color: var(--ink-2); font-weight: 600; }
.order-line.discount b { color: #0E9F6E; }
.order-total { display: flex; justify-content: space-between; align-items: baseline; padding: 16px 20px; border-top: 1px dashed var(--line); }
.order-total span { font-size: 14px; color: var(--ink-2); }
.order-total b { font-family: var(--mono); font-size: 26px; color: var(--ink); }
.field-label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-2); margin: 22px 0 10px; }
.pay-methods { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pay-method { display: flex; align-items: center; gap: 10px; padding: 14px 14px; border-radius: 12px; border: 1px solid var(--line); font-size: 14px; font-weight: 600; color: var(--ink-2); transition: all .2s ease; text-align: left; }
.pay-method:hover { border-color: #BBD5F5; }
.pay-method.is-on { border-color: var(--blue); background: var(--bg-tint); color: var(--blue-ink); box-shadow: 0 0 0 3px rgba(10,132,255,.08); }
.pay-method svg { width: 21px; height: 21px; flex-shrink: 0; }
.pay-method .radio { width: 16px; height: 16px; border-radius: 50%; border: 1.5px solid var(--line); margin-left: auto; flex-shrink: 0; position: relative; }
.pay-method.is-on .radio { border-color: var(--blue); }
.pay-method.is-on .radio::after { content: ""; position: absolute; inset: 3px; border-radius: 50%; background: var(--blue); }
.coupon-row { display: flex; gap: 9px; }
.coupon-row input { flex: 1; min-width: 0; height: 44px; padding: 0 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 14px; outline: none; transition: border-color .2s ease; }
.coupon-row input:focus { border-color: var(--blue); }
.coupon-row button { height: 44px; padding: 0 18px; border-radius: 10px; background: var(--bg-soft); border: 1px solid var(--line); font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.coupon-row button:hover { border-color: #BBD5F5; color: var(--blue-ink); }
.coupon-msg { font-size: 12.5px; margin-top: 8px; min-height: 18px; }
.coupon-msg.ok { color: #0E9F6E; }
.coupon-msg.err { color: #DC5A52; }
.modal-agree { font-size: 12px; color: var(--muted-2); line-height: 1.7; margin: 18px 0 0; text-align: center; }
.modal-agree a { color: var(--blue-ink); }

.pay-progress { display: flex; align-items: center; justify-content: center; gap: 0; margin: 6px 0 26px; }
.pay-step { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 11px; color: var(--muted-2); }
.pay-step i { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-style: normal; font-size: 10px; background: var(--bg-soft); border: 1px solid var(--line); }
.pay-step.is-on { color: var(--blue-ink); }
.pay-step.is-on i { background: var(--blue); color: #fff; border-color: var(--blue); }
.pay-step.is-done i { background: #E3F7EF; color: #0E9F6E; border-color: #BCEBD6; }
.pay-sep { width: 34px; height: 1px; background: var(--line); margin: 0 10px; }

.pay-qr { width: 188px; height: 188px; margin: 6px auto 16px; border-radius: 14px; border: 1px solid var(--line); padding: 10px; background: #fff; box-shadow: var(--shadow-xs); }
.pay-qr svg { width: 100%; height: 100%; }
.pay-qr-hint { text-align: center; font-size: 13px; color: var(--muted); }
.pay-qr-hint b { color: var(--ink); font-family: var(--mono); }
.pay-countdown { text-align: center; font-family: var(--mono); font-size: 12px; color: var(--muted-2); margin-top: 8px; }

.pay-success { text-align: center; padding: 10px 0 4px; }
.pay-success .ring { width: 74px; height: 74px; margin: 0 auto 22px; border-radius: 50%; display: grid; place-items: center; background: #E7F8F0; color: #0E9F6E; }
.pay-success .ring svg { width: 36px; height: 36px; }
.pay-success h3 { font-size: 22px; margin-bottom: 8px; }
.pay-success p { font-size: 14px; color: var(--muted); margin: 0 0 24px; }
.success-box { border: 1px solid var(--line); border-radius: var(--r-md); background: var(--bg-soft); padding: 16px 18px; text-align: left; }
.success-box .line { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; padding: 7px 0; color: var(--muted); }
.success-box .line b { color: var(--ink-2); font-family: var(--mono); font-size: 12.5px; font-weight: 600; }
.success-box .line.hl b { color: #0E9F6E; }

.toast { position: fixed; left: 50%; bottom: 36px; transform: translate(-50%, 16px); z-index: 300; background: var(--navy-0); color: #fff; padding: 12px 20px; border-radius: 11px; font-size: 13.5px; box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none; transition: all .28s ease; }
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }


/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.3,1); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 补充规则 ---------- */
#plans, #compare, #faq, #gallery, #specs, #capabilities { scroll-margin-top: 88px; }
.stars svg { fill: currentColor; stroke-width: 1; }
.compare { touch-action: pan-y; }
.compare input[type=range] { -webkit-appearance: none; appearance: none; background: transparent; touch-action: none; }
.compare input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 46px; height: 420px; border: 0; background: transparent; cursor: ew-resize; }
.compare input[type=range]::-moz-range-thumb { width: 46px; height: 420px; border: 0; background: transparent; cursor: ew-resize; }
@media (max-width: 640px) { .desktop-only { display: none; } }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-links { gap: 22px; }
  .wb-side { width: 210px; }
  .feature-grid { gap: 16px; }
  .band-inner { grid-template-columns: 1fr; gap: 36px; }
  .band { padding: 52px 42px; }
  .cap-row { gap: 44px; }
  .footer-grid { gap: 30px; }
}
@media (max-width: 900px) {
  .section { padding: 80px 0; }
  .nav-links, .nav-actions .nav-login { display: none; }
  .nav-toggle { display: flex; }
  .nav-actions { margin-left: auto; }
  .nav-actions .btn { display: none; }
  .mobile-menu.is-open { display: block; padding: 8px 0 20px; border-top: 1px solid var(--line); }
  .mobile-menu a { display: block; padding: 12px 4px; font-size: 15px; color: var(--ink-2); border-bottom: 1px solid var(--line-soft); }
  .mobile-menu a:last-child { border-bottom: 0; }
  .wb-side { display: none; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); row-gap: 40px; }
  .flow-step::after { display: none; }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .gallery-item:last-child { display: none; }
  .quote-grid { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
  .cap-row, .cap-row.is-reverse { grid-template-columns: 1fr; gap: 30px; padding: 54px 0; }
  .cap-row.is-reverse .cap-visual { order: 0; }
  .plan-grid { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .plan.is-featured { order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .container { width: min(var(--max), calc(100% - 32px)); }
  .section { padding: 66px 0; }
  .hero { padding-top: 68px; }
  .hero-stats { flex-wrap: wrap; gap: 20px 0; }
  .hero-stat { flex: 0 0 50%; }
  .hero-stat:nth-child(3) { border-left: 0; }
  .workbench-wrap { margin-top: 52px; }
  .wb-tools { width: 48px; }
  .wb-tool { width: 34px; height: 34px; }
  .wb-main { min-height: 320px; }
  .compare { min-height: 320px; }
  .wb-file { display: none; }
  .wb-bottom { gap: 12px; font-size: 10px; }
  .wb-bottom .hide-sm { display: none; }
  .trust-logos { gap: 22px; }
  .trust-logo { font-size: 13px; }
  .feature-grid, .gallery { grid-template-columns: 1fr; }
  .gallery-item:last-child { display: block; }
  .flow { grid-template-columns: 1fr; row-gap: 30px; }
  .band { padding: 42px 26px; border-radius: var(--r-lg); }
  .band-metrics { grid-template-columns: 1fr; gap: 20px; }
  .band-metric { display: flex; align-items: baseline; gap: 14px; }
  .cta { padding: 72px 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
  .page-hero { padding: 62px 0 70px; }
  .billing-switch button { padding: 0 14px; font-size: 13px; }
  .pay-methods { grid-template-columns: 1fr; }
  .modal-body, .modal-head { padding-left: 20px; padding-right: 20px; }
  .spec-table th, .spec-table td { padding: 14px 14px; font-size: 13px; }
}