/* ============================================================
   锋识科技 ifengsee.com 官网全站样式
   纯静态，无外部依赖
   ============================================================ */

:root {
  --ink: #0b1626;          /* 深色底 */
  --ink-2: #101f36;
  --brand: #1670f0;        /* 主色：锋利蓝 */
  --cyan: #23d0e8;         /* 辅色：青 */
  --grad: linear-gradient(135deg, #1670f0 0%, #23d0e8 100%);
  --bg: #f6f9fc;           /* 浅色内容区 */
  --card: #ffffff;
  --text: #24344d;
  --muted: #5d708c;
  --line: #e3eaf3;
  --radius: 16px;
  --shadow: 0 6px 24px rgba(16, 42, 84, 0.08);
  --shadow-lg: 0 14px 40px rgba(16, 42, 84, 0.14);
  --header-h: 68px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

/* ---------------- 顶部导航 ---------------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(11, 22, 38, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.3s;
}
.site-header.scrolled { background: rgba(11, 22, 38, 0.94); }

.nav {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
}
.brand .logo-mark { width: 34px; height: 34px; flex: none; }
.brand .brand-cn {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 2px;
}
.brand .brand-en {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 1.5px;
  text-transform: lowercase;
  display: block;
  line-height: 1.2;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 15px;
  padding: 8px 16px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.nav-links a[aria-current="page"] {
  color: #fff;
  font-weight: 600;
}
.nav-links a[aria-current="page"]::after {
  content: "";
  display: block;
  height: 2px;
  margin-top: 2px;
  border-radius: 2px;
  background: var(--grad);
}
.nav-links .lang-switch {
  margin-left: 6px;
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  letter-spacing: 1px;
}
.nav-links .lang-switch:hover { border-color: var(--cyan); color: var(--cyan); background: none; }
.nav-links .nav-cta {
  margin-left: 10px;
  color: #fff;
  background: var(--grad);
  font-weight: 600;
}
.nav-links .nav-cta:hover { filter: brightness(1.1); background: var(--grad); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: #fff;
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------- Hero ---------------- */

.hero {
  position: relative;
  background: var(--ink);
  color: #fff;
  padding: calc(var(--header-h) + 96px) 0 110px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 78% 18%, rgba(22, 112, 240, 0.28), transparent 65%),
    radial-gradient(ellipse 50% 45% at 15% 85%, rgba(35, 208, 232, 0.14), transparent 60%);
  pointer-events: none;
}
.hero-deco {
  position: absolute;
  right: -60px;
  top: 50%;
  transform: translateY(-50%);
  width: 560px;
  opacity: 0.5;
  pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--cyan);
  border: 1px solid rgba(35, 208, 232, 0.35);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 28px;
}
.hero-eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.hero h1 {
  font-size: clamp(34px, 5.2vw, 58px);
  font-weight: 800;
  letter-spacing: 4px;
  line-height: 1.25;
  max-width: 720px;
}
.hero h1 .grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 22px;
  font-size: clamp(15px, 1.6vw, 18px);
  color: rgba(255, 255, 255, 0.68);
  max-width: 620px;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-chips {
  margin-top: 56px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}
.hero-chips .chip {
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 999px;
  padding: 7px 18px;
}
.hero-chips .chip-arrow { color: var(--cyan); font-weight: 700; }

/* 子页面小 Hero */
.hero.hero-sub-page { padding: calc(var(--header-h) + 72px) 0 72px; }
.hero.hero-sub-page h1 { font-size: clamp(30px, 4vw, 44px); }

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 24px rgba(22, 112, 240, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); }
.btn-ghost {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.04);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-light {
  background: #fff;
  color: var(--brand);
}
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* ---------------- 通用 Section ---------------- */

.section { padding: 88px 0; }
.section.alt { background: #fff; }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}
.section-head .kicker {
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--brand);
  font-weight: 700;
  text-transform: uppercase;
}
.section-head h2 {
  margin-top: 10px;
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--ink);
}
.section-head p { margin-top: 14px; color: var(--muted); }

.section-head.left { text-align: left; margin-left: 0; }

/* ---------------- 卡片 ---------------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  box-shadow: var(--shadow);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.card .card-icon {
  width: 52px; height: 52px;
  border-radius: 13px;
  background: linear-gradient(135deg, rgba(22, 112, 240, 0.1), rgba(35, 208, 232, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.card .card-icon svg { width: 26px; height: 26px; stroke: var(--brand); }
.card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}
.card p { font-size: 15px; color: var(--muted); }

.card .card-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand);
}
.card .card-more:hover { text-decoration: underline; }

/* ---------------- 首页：旗舰产品横幅 ---------------- */

.flagship {
  position: relative;
  border-radius: 20px;
  background: var(--ink);
  color: #fff;
  padding: 52px 56px;
  overflow: hidden;
  margin-bottom: 24px;
}
.flagship::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 80% at 88% 30%, rgba(22, 112, 240, 0.35), transparent 65%),
    radial-gradient(ellipse 40% 60% at 70% 90%, rgba(35, 208, 232, 0.18), transparent 60%);
}
.flagship > * { position: relative; }
.flagship .tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--cyan);
  border: 1px solid rgba(35, 208, 232, 0.4);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 18px;
}
.flagship h3 { font-size: 28px; font-weight: 800; letter-spacing: 2px; }
.flagship p {
  margin-top: 14px;
  max-width: 560px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
}
.flagship .flagship-points {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.flagship .flagship-points li {
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 999px;
  padding: 6px 16px;
  color: rgba(255, 255, 255, 0.8);
}

/* ---------------- 产品页：架构图 ---------------- */

.arch {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 44px;
  box-shadow: var(--shadow);
}
.arch-row { text-align: center; }
.arch-label {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--muted);
  margin-bottom: 12px;
}
.arch-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.arch-chips .chip {
  font-size: 14px;
  padding: 8px 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
}
.arch-mid {
  background: var(--grad);
  color: #fff;
  border-radius: 14px;
  padding: 22px;
  text-align: center;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 3px;
  box-shadow: 0 10px 30px rgba(22, 112, 240, 0.3);
}
.arch-mid small {
  display: block;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 1px;
  opacity: 0.85;
  margin-top: 4px;
}
.arch-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.arch-cell {
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 14px;
  padding: 18px;
  text-align: center;
}
.arch-cell strong {
  display: block;
  font-size: 17px;
  color: var(--ink);
  letter-spacing: 1px;
}
.arch-cell span { font-size: 13px; color: var(--muted); }
.arch-base {
  border: 1px dashed #c6d4e6;
  background: #f0f5fb;
  border-radius: 14px;
  padding: 16px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 1px;
}
.arch-base strong { color: var(--text); margin-right: 12px; letter-spacing: 2px; }
.arch-arrow {
  text-align: center;
  color: #b3c3d8;
  font-size: 18px;
  line-height: 1;
  padding: 12px 0;
  user-select: none;
}

/* ---------------- 产品页：产品详块 ---------------- */

.product-block {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 48px;
  align-items: start;
  padding: 64px 0;
  border-top: 1px solid var(--line);
}
.product-block:first-of-type { border-top: none; }
.product-block .pb-intro .pb-num {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--brand);
}
.product-block .pb-intro h3 {
  margin-top: 8px;
  font-size: 28px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 2px;
}
.product-block .pb-intro .pb-en {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 1px;
  margin-top: 4px;
}
.product-block .pb-intro p {
  margin-top: 16px;
  font-size: 15px;
  color: var(--muted);
}
.pb-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.pb-features .feat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.pb-features .feat:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.pb-features .feat h4 {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pb-features .feat h4::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 3px;
  background: var(--grad);
  flex: none;
}
.pb-features .feat p { font-size: 14px; color: var(--muted); }

/* 底座能力条 */
.base-strip {
  background: var(--ink);
  border-radius: 20px;
  color: #fff;
  padding: 40px 48px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 14px;
}
.base-strip h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-right: 18px;
}
.base-strip .base-note {
  width: 100%;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 2px;
}
.base-strip .chip {
  font-size: 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  padding: 8px 20px;
}

/* ---------------- 解决方案页 ---------------- */

.solution-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 44px 48px;
  box-shadow: var(--shadow);
}
.solution-card + .solution-card { margin-top: 28px; }
.solution-card .sc-tag {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--brand);
  font-weight: 700;
}
.solution-card h3 {
  font-size: 24px;
  font-weight: 800;
  color: var(--ink);
  margin-top: 8px;
  letter-spacing: 1px;
}
.solution-card .sc-cols {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.solution-card .sc-col h4 {
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--muted);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
}
.solution-card .sc-col:nth-child(2) h4 { border-color: var(--brand); }
.solution-card .sc-col:nth-child(3) h4 { border-color: var(--cyan); }
.solution-card .sc-col p, .solution-card .sc-col li {
  font-size: 14.5px;
  color: var(--text);
}
.solution-card .sc-col li {
  padding-left: 18px;
  position: relative;
  margin-bottom: 6px;
}
.solution-card .sc-col li::before {
  content: "";
  position: absolute;
  left: 0; top: 10px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--grad);
}

/* ---------------- 关于页 ---------------- */

.about-lead {
  font-size: 17px;
  color: var(--text);
  max-width: 820px;
}
.about-lead + .about-lead { margin-top: 18px; }
.about-lead strong { color: var(--brand); }

.contact-card {
  background: var(--ink);
  color: #fff;
  border-radius: 20px;
  padding: 48px 52px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.contact-card h3 { font-size: 26px; font-weight: 800; letter-spacing: 2px; }
.contact-card .contact-desc { margin-top: 12px; color: rgba(255, 255, 255, 0.65); font-size: 15px; }
.contact-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 15px;
}
.contact-list li:last-child { border-bottom: none; }
.contact-list .cl-label {
  flex: none;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  width: 48px;
  letter-spacing: 2px;
}
.contact-list a:hover { color: var(--cyan); }

/* ---------------- CTA 横幅 ---------------- */

.cta-band {
  background: var(--grad);
  border-radius: 20px;
  color: #fff;
  text-align: center;
  padding: 56px 32px;
}
.cta-band h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; letter-spacing: 2px; }
.cta-band p { margin-top: 12px; opacity: 0.9; }
.cta-band .btn { margin-top: 28px; }

/* ---------------- 页脚 ---------------- */

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.6);
  padding: 64px 0 32px;
  margin-top: 88px;
  font-size: 14px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand p { max-width: 300px; font-size: 13.5px; }
.footer-col h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}
.footer-col li { margin-bottom: 10px; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}
.footer-bottom a:hover { color: var(--cyan); }

/* ---------------- 滚动渐入 ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }

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

/* ---------------- 响应式 ---------------- */

@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .product-block { grid-template-columns: 1fr; gap: 28px; padding: 48px 0; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-card { grid-template-columns: 1fr; padding: 36px 32px; }
  .solution-card { padding: 32px 28px; }
  .solution-card .sc-cols { grid-template-columns: 1fr; gap: 20px; }
  .hero-deco { display: none; }
}

@media (max-width: 640px) {
  .grid-3, .grid-4, .grid-2, .pb-features, .arch-pair { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .flagship { padding: 36px 28px; }
  .arch { padding: 28px 20px; }
  .base-strip { padding: 30px 26px; }

  .nav-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(11, 22, 38, 0.98);
    padding: 16px 24px 24px;
    gap: 4px;
    display: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 12px; font-size: 16px; }
  .nav-links .nav-cta { margin-left: 0; margin-top: 8px; text-align: center; }
}