/* 水印云官网共享样式（index.html 与 pricing/ 共用）。
   静态站无构建流程，直接手写 CSS；颜色变量与用户端控制台视觉保持一致。 */
:root {
  --bg: #070b14;
  --bg2: #0d1424;
  --ink: #e9eefb;
  --muted: #93a0bf;
  --rule: rgba(146, 166, 224, 0.14);
  --accent: #4f8cff;
  --grad: linear-gradient(135deg, #4f8cff 0%, #8b5cf6 100%);
  --glow-blue: rgba(79, 140, 255, 0.35);
  --glow-violet: rgba(139, 92, 246, 0.28);
  --font-mono: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.75;
  overflow-x: hidden; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
/* height:auto 必须有：图片带 width/height 属性，缺省会按属性高度固定，
   容器变窄时被纵向拉伸变形（首屏主视觉与工作流程配图都会中招） */
img { max-width: 100%; height: auto; display: block; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 氛围光晕 */
.ambient { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.ambient::before, .ambient::after { content: ''; position: absolute; border-radius: 50%; filter: blur(90px); }
.ambient::before { width: 720px; height: 720px; top: -280px; right: -180px; background: radial-gradient(circle, var(--glow-blue), transparent 65%); opacity: 0.55; }
.ambient::after { width: 640px; height: 640px; top: 40%; left: -260px; background: radial-gradient(circle, var(--glow-violet), transparent 65%); opacity: 0.4; }

/* 导航 */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7, 11, 20, 0.78); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner { max-width: 1120px; margin: 0 auto; padding: 0 24px; height: 68px; display: flex; align-items: center; gap: 28px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.12rem; }
.logo-mark { width: 34px; height: 34px; border-radius: 9px; background: var(--grad); display: inline-grid; place-items: center; box-shadow: 0 4px 18px rgba(79, 140, 255, 0.4); }
.logo-mark svg { width: 19px; height: 19px; }
.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: 0.92rem; color: var(--muted); }
.nav-links a:hover { color: var(--ink); }
.nav-login { color: var(--muted); font-size: 0.92rem; padding: 8px 14px; border-radius: 9px; }
.nav-login:hover { color: var(--ink); background: rgba(255, 255, 255, 0.06); }
.nav-cta { padding: 9px 20px; border-radius: 999px; background: var(--grad); color: #fff; font-size: 0.9rem; font-weight: 600; transition: transform 0.2s, box-shadow 0.2s; box-shadow: 0 4px 16px rgba(79, 140, 255, 0.35); }
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 22px rgba(139, 92, 246, 0.45); }

/* Hero */
.hero { padding: 96px 0 90px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; border-radius: 999px; font-size: 0.82rem; color: var(--accent); background: rgba(79, 140, 255, 0.1); border: 1px solid rgba(79, 140, 255, 0.3); margin-bottom: 26px; font-weight: 500; }
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
h1.hero-title { font-size: clamp(2.4rem, 5vw, 3.6rem); line-height: 1.22; font-weight: 800; margin-bottom: 22px; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: 1.08rem; color: var(--muted); max-width: 480px; margin-bottom: 38px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 52px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 30px; border-radius: 12px; font-size: 0.98rem; font-weight: 600; transition: transform 0.2s, box-shadow 0.2s; border: none; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 28px rgba(79, 140, 255, 0.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 36px rgba(139, 92, 246, 0.5); }
.btn-ghost { background: rgba(255, 255, 255, 0.04); color: var(--ink); border: 1px solid var(--rule); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); transform: translateY(-2px); }
.hero-stats { display: flex; gap: 44px; flex-wrap: wrap; }
.stat .num { font-size: 1.7rem; font-weight: 800; font-family: var(--font-mono); }
.stat .num span { color: var(--accent); }
.stat .label { font-size: 0.82rem; color: var(--muted); margin-top: 2px; }
.hero-visual { position: relative; }
.hero-visual .frame { border-radius: 20px; overflow: hidden; border: 1px solid var(--rule); box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55); position: relative; }
.hero-visual .frame::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(7, 11, 20, 0.6)); pointer-events: none; }
.float-card { position: absolute; z-index: 2; padding: 13px 18px; border-radius: 14px; background: rgba(13, 20, 36, 0.82); backdrop-filter: blur(12px); border: 1px solid var(--rule); box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45); font-size: 0.82rem; display: flex; align-items: center; gap: 10px; animation: float 5s ease-in-out infinite; }
.float-card .icon-chip { width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; flex-shrink: 0; }
.float-card strong { display: block; font-size: 0.88rem; }
.float-card small { color: var(--muted); font-size: 0.74rem; }
.fc-1 { top: 8%; left: -7%; }
.fc-2 { bottom: 12%; right: -5%; animation-delay: 2.2s; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* 区块 */
section.block { padding: 96px 0; }
/* 定价页首屏：导航是 sticky 已占位，这里只需少量呼吸空间，避免顶部大片空白 */
.pricing-hero { padding-top: 64px; }
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 60px; }
.sec-tag { display: inline-block; font-size: 0.78rem; font-weight: 600; letter-spacing: 0.22em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; font-family: var(--font-mono); }
.sec-head h1, .sec-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 800; line-height: 1.3; margin-bottom: 14px; }
.sec-head p { color: var(--muted); font-size: 1rem; }

/* 能力卡片 */
.cap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cap-card { background: rgba(13, 20, 36, 0.6); border: 1px solid var(--rule); border-radius: 16px; padding: 30px 26px; transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s; }
.cap-card:hover { transform: translateY(-6px); border-color: rgba(79, 140, 255, 0.35); box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4); }
.cap-icon { width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center; margin-bottom: 20px; background: rgba(79, 140, 255, 0.12); border: 1px solid rgba(79, 140, 255, 0.25); }
.cap-card.v .cap-icon { background: rgba(139, 92, 246, 0.12); border-color: rgba(139, 92, 246, 0.28); }
.cap-card h3 { font-size: 1.08rem; font-weight: 700; margin-bottom: 10px; }
.cap-card p { font-size: 0.88rem; color: var(--muted); }
.tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: 0.72rem; padding: 3px 10px; border-radius: 999px; background: rgba(146, 166, 224, 0.1); color: var(--muted); border: 1px solid var(--rule); }

/* 工作流程 */
.flow-wrap { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 64px; align-items: center; }
.flow-img { border-radius: 20px; overflow: hidden; border: 1px solid var(--rule); box-shadow: 0 30px 70px rgba(0, 0, 0, 0.5); }
.flow-steps { display: flex; flex-direction: column; gap: 8px; }
.step { display: flex; gap: 20px; padding: 22px 20px; border-radius: 16px; }
.step:hover { background: rgba(146, 166, 224, 0.05); }
.step-idx { width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0; background: var(--grad); display: grid; place-items: center; font-family: var(--font-mono); font-weight: 700; font-size: 1rem; color: #fff; box-shadow: 0 6px 18px rgba(79, 140, 255, 0.35); }
.step h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 0.9rem; color: var(--muted); }

/* 技术 */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tech-card { background: linear-gradient(180deg, rgba(17, 26, 48, 0.7), rgba(13, 20, 36, 0.4)); border: 1px solid var(--rule); border-radius: 16px; padding: 28px 26px; transition: transform 0.25s, border-color 0.25s; }
.tech-card:hover { transform: translateY(-4px); border-color: rgba(139, 92, 246, 0.35); }
.tech-card .t-icon { font-size: 1.5rem; margin-bottom: 14px; display: block; }
.tech-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.tech-card p { font-size: 0.85rem; color: var(--muted); }

/* 场景 */
.scene-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.scene-card { border-radius: 16px; padding: 30px 26px; border: 1px solid var(--rule); background: rgba(13, 20, 36, 0.6); transition: transform 0.25s, border-color 0.25s; }
.scene-card:hover { transform: translateY(-5px); border-color: rgba(79, 140, 255, 0.35); }
.scene-card .emoji { font-size: 1.8rem; display: block; margin-bottom: 16px; }
.scene-card h3 { font-size: 1.02rem; font-weight: 700; margin-bottom: 8px; }
.scene-card p { font-size: 0.85rem; color: var(--muted); }

/* FAQ（GEO：问答对同时服务用户与生成式引擎摘录） */
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: rgba(13, 20, 36, 0.6); border: 1px solid var(--rule); border-radius: 14px; padding: 22px 26px; }
.faq-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.faq-item p { font-size: 0.9rem; color: var(--muted); }

/* 定价 */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.price-card { height: 100%; background: rgba(13, 20, 36, 0.6); border: 1px solid var(--rule); border-radius: 20px; padding: 38px 32px; display: flex; flex-direction: column; position: relative; transition: transform 0.25s, box-shadow 0.25s; }
.price-card:hover { transform: translateY(-6px); }
.price-card.featured { border: 1px solid rgba(79, 140, 255, 0.45); background: linear-gradient(180deg, rgba(79, 140, 255, 0.1), rgba(139, 92, 246, 0.06)), rgba(13, 20, 36, 0.7); box-shadow: 0 24px 60px rgba(79, 140, 255, 0.18); }
.price-badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--grad); color: #fff; font-size: 0.74rem; font-weight: 600; padding: 5px 16px; border-radius: 999px; white-space: nowrap; }
.price-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.price-desc { font-size: 0.82rem; color: var(--muted); margin-bottom: 22px; }
.price-num { font-size: 2.5rem; font-weight: 800; font-family: var(--font-mono); line-height: 1; margin-bottom: 4px; }
.price-num small { font-size: 0.9rem; font-weight: 500; color: var(--muted); font-family: 'PingFang SC', sans-serif; }
.price-unit { font-size: 0.78rem; color: var(--muted); margin-bottom: 26px; }
.price-feats { list-style: none; margin-bottom: 30px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.price-feats li { display: flex; align-items: flex-start; gap: 10px; font-size: 0.88rem; color: var(--muted); }
.price-feats li svg { flex-shrink: 0; margin-top: 5px; }
.price-feats li strong { color: var(--ink); font-weight: 600; }
.price-btn { text-align: center; padding: 13px; border-radius: 12px; font-weight: 600; font-size: 0.95rem; border: 1px solid var(--rule); transition: all 0.2s; display: block; }
.price-btn:hover { background: rgba(255, 255, 255, 0.06); }
.price-btn.primary { background: var(--grad); color: #fff; border: none; box-shadow: 0 8px 24px rgba(79, 140, 255, 0.4); }
.price-btn.primary:hover { box-shadow: 0 12px 32px rgba(139, 92, 246, 0.5); transform: translateY(-1px); }
.price-note { text-align: center; color: var(--muted); font-size: 0.85rem; margin-top: 34px; }

/* CTA 带 */
.cta-band { border-radius: 26px; padding: 70px 48px; text-align: center; position: relative; overflow: hidden; background: linear-gradient(135deg, rgba(79, 140, 255, 0.16), rgba(139, 92, 246, 0.14)), rgba(13, 20, 36, 0.8); border: 1px solid rgba(79, 140, 255, 0.3); }
.cta-band h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); font-weight: 800; margin-bottom: 14px; }
.cta-band p { color: var(--muted); margin-bottom: 34px; }
.cta-band .btn { position: relative; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--rule); padding: 56px 0 40px; margin-top: 40px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 44px; }
.foot-brand p { font-size: 0.85rem; color: var(--muted); margin-top: 14px; max-width: 280px; }
.foot-col h4 { font-size: 0.88rem; font-weight: 700; margin-bottom: 16px; }
.foot-col a { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 10px; }
.foot-col a:hover { color: var(--ink); }
.foot-bottom { border-top: 1px solid var(--rule); padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.78rem; color: var(--muted); }

/* 渐显动画：仅在 JS 可用时隐藏，保证无 JS / 爬虫直接看到内容 */
html.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
html.js .reveal.in { opacity: 1; transform: none; }

/* 移动端导航开关：窄屏隐藏横向链接后，仍需能到达定价/FAQ 等页面 */
.nav-toggle {
  display: none; width: 38px; height: 38px; border-radius: 10px; flex-shrink: 0;
  align-items: center; justify-content: center; cursor: pointer;
  background: rgba(255, 255, 255, 0.05); border: 1px solid var(--rule); color: var(--ink);
  transition: background 0.2s, border-color 0.2s;
}
.nav-toggle:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(79, 140, 255, 0.4); }
.nav-toggle svg { width: 18px; height: 18px; }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded='true'] .icon-menu { display: none; }
.nav-toggle[aria-expanded='true'] .icon-close { display: block; }

/* 响应式 */
@media (max-width: 960px) {
  .hero-grid, .flow-wrap { grid-template-columns: 1fr; gap: 44px; }
  .cap-grid, .tech-grid, .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .price-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .foot-grid { grid-template-columns: repeat(2, 1fr); }
  .fc-1 { left: 2%; } .fc-2 { right: 2%; }
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; }
  /* 导航链接收起后，登录按钮承担右对齐职责，否则会紧贴 logo */
  .nav-login { margin-left: auto; }
  /* 展开态：绝对定位挂到站点头部下方，不挤压主内容 */
  .nav-links.open {
    display: flex; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0; margin-left: 0; padding: 6px 24px 14px;
    background: #0a0f1a;
    border-bottom: 1px solid var(--rule); box-shadow: 0 18px 36px rgba(0, 0, 0, 0.45);
  }
  .nav-links.open a { padding: 13px 0; font-size: 1rem; border-bottom: 1px solid var(--rule); }
  .nav-links.open a:last-child { border-bottom: none; }
  .nav-links.open a:hover { color: var(--ink); }
}
@media (max-width: 600px) {
  section.block { padding: 68px 0; }
  .hero { padding: 60px 0 70px; }
  .cap-grid, .tech-grid, .scene-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
  .cta-band { padding: 50px 26px; }
  .float-card { display: none; }
  /* 小屏导航压缩间距，避免「免费注册」被挤出视口 */
  .nav-inner { gap: 10px; }
  .nav-login { padding: 8px 6px; font-size: 0.88rem; }
  .nav-cta { padding: 9px 14px; font-size: 0.86rem; }
  .logo { font-size: 1rem; }
}

/* 尊重系统「减少动态效果」：关闭漂浮动画与平滑滚动，渐显直接呈现 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .float-card { animation: none; }
  html.js .reveal { transition: none; }
}