/* =========================================================
   东宜安软件 门户网站 — 样式表
   ========================================================= */

:root {
  --c-primary: #2563eb;
  --c-primary-dark: #1d4ed8;
  --c-primary-light: #3b82f6;
  --c-accent: #06b6d4;
  --c-ink: #0f172a;
  --c-ink-2: #334155;
  --c-muted: #64748b;
  --c-line: #e2e8f0;
  --c-bg: #ffffff;
  --c-bg-alt: #f6f8fc;
  --c-card: #ffffff;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .12);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1200px;
  --header-h: 72px;
  --trans: .28s cubic-bezier(.4, 0, .2, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: var(--trans);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff; box-shadow: 0 8px 20px rgba(37, 99, 235, .28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(37, 99, 235, .38); }
.btn-ghost { background: rgba(255,255,255,.8); color: var(--c-ink); border-color: var(--c-line); backdrop-filter: blur(6px); }
.btn-ghost:hover { border-color: var(--c-primary); color: var(--c-primary); transform: translateY(-2px); }
.btn-lg { padding: 15px 32px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: var(--trans);
}
/* 用伪元素承载毛玻璃背景：避免 backdrop-filter 在 header 上创建
   包含块，导致移动端 fixed 抽屉菜单高度被限制为 header 高度 */
.site-header::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  transition: var(--trans);
}
.site-header.scrolled { border-bottom-color: var(--c-line); box-shadow: var(--shadow-sm); }
.site-header.scrolled::before { background: rgba(255,255,255,.92); }
.nav-wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; }

.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.logo-mark {
  width: 40px; height: 40px; flex: 0 0 40px;
  object-fit: contain;
}
.logo-text { font-size: 19px; letter-spacing: .5px; }

.nav { display: flex; align-items: center; gap: 28px; }
.nav-list { display: flex; gap: 6px; }
.nav-link {
  position: relative; padding: 8px 14px; border-radius: 8px;
  font-size: 15px; font-weight: 500; color: var(--c-ink-2); transition: var(--trans);
}
.nav-link:hover, .nav-link.active { color: var(--c-primary); background: rgba(37,99,235,.07); }

.hamburger {
  display: none; width: 44px; height: 44px; border: 0; background: transparent;
  cursor: pointer; flex-direction: column; justify-content: center; align-items: center; gap: 5px;
  border-radius: 10px;
}
.hamburger span { width: 24px; height: 2.5px; background: var(--c-ink); border-radius: 2px; transition: var(--trans); }
.hamburger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

.nav-overlay {
  position: fixed; inset: 0; background: rgba(15,23,42,.45);
  opacity: 0; visibility: hidden; transition: var(--trans); z-index: 999;
}
.nav-overlay.active { opacity: 1; visibility: visible; }

/* ---------- Hero ---------- */
.hero {
  position: relative; padding: calc(var(--header-h) + 80px) 0 90px;
  background: linear-gradient(180deg, #eef4ff 0%, #f8fbff 55%, #ffffff 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(600px 400px at 82% 12%, rgba(6,182,212,.16), transparent 70%),
    radial-gradient(560px 420px at 8% 82%, rgba(37,99,235,.16), transparent 70%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(15,23,42,.035) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(15,23,42,.035) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 80%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 80%);
}
.hero-inner { position: relative; z-index: 1; }
.hero-content { max-width: 760px; }
.hero-badge {
  display: inline-block; padding: 7px 16px; border-radius: 999px;
  background: #fff; border: 1px solid var(--c-line); box-shadow: var(--shadow-sm);
  font-size: 13.5px; font-weight: 600; color: var(--c-primary-dark); margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(32px, 5.2vw, 58px); line-height: 1.18; font-weight: 800;
  letter-spacing: -1px; margin-bottom: 22px;
}
.hero-title em {
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: clamp(15px, 1.6vw, 18px); color: var(--c-ink-2); max-width: 620px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-stats {
  margin-top: 64px; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: var(--c-line); border: 1px solid var(--c-line);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md);
}
.stat { background: #fff; padding: 28px 22px; text-align: center; }
.stat-num {
  font-size: clamp(26px, 3vw, 38px); font-weight: 800; letter-spacing: -1px;
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 14px; color: var(--c-muted); margin-top: 4px; }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--c-bg-alt); }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-tag {
  display: inline-block; padding: 5px 14px; border-radius: 999px; margin-bottom: 16px;
  background: rgba(37,99,235,.09); color: var(--c-primary-dark);
  font-size: 13px; font-weight: 700; letter-spacing: 1px;
}
.section-title { font-size: clamp(24px, 3.4vw, 38px); font-weight: 800; letter-spacing: -.5px; line-height: 1.28; margin-bottom: 16px; }
.section-sub { color: var(--c-muted); font-size: 16px; }

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

/* ---------- Business cards ---------- */
.biz-card {
  background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 32px 26px; transition: var(--trans); position: relative; overflow: hidden;
}
.biz-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  transform: scaleX(0); transform-origin: left; transition: var(--trans);
}
.biz-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.biz-card:hover::before { transform: scaleX(1); }
.biz-icon {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center;
  font-size: 26px; background: linear-gradient(135deg, #eef4ff, #e6fbff); margin-bottom: 20px;
}
.biz-card h3 { font-size: 20px; margin-bottom: 10px; }
.biz-card p { color: var(--c-muted); font-size: 14.5px; margin-bottom: 16px; }
.biz-list li {
  position: relative; padding-left: 20px; font-size: 14px; color: var(--c-ink-2); margin-bottom: 7px;
}
.biz-list li::before {
  content: "✓"; position: absolute; left: 0; color: var(--c-primary); font-weight: 700;
}

/* ---------- Solution cards ---------- */
.solution-card {
  background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 28px 24px; transition: var(--trans);
}
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.solution-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.solution-icon {
  width: 50px; height: 50px; border-radius: 13px; display: grid; place-items: center;
  font-size: 24px; background: linear-gradient(135deg, #eef4ff, #e6fbff);
}
.solution-tag {
  font-size: 12px; font-weight: 700; color: var(--c-primary-dark);
  background: rgba(37,99,235,.09); padding: 4px 10px; border-radius: 999px;
}
.solution-card h3 { font-size: 19px; margin-bottom: 8px; }
.solution-card p { color: var(--c-muted); font-size: 14.5px; }

/* ---------- Case cards ---------- */
.case-card {
  position: relative; overflow: hidden;
  display: flex; flex-direction: column;
  background: var(--c-card);
  border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 30px 28px 32px;
  transition: transform var(--trans), box-shadow var(--trans), border-color var(--trans);
}
/* 悬停时顶部渐变描边展开 */
.case-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  transform: scaleX(0); transform-origin: left; transition: transform var(--trans);
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.case-card:hover::before { transform: scaleX(1); }
/* 右下角序号水印 */
.case-index {
  position: absolute; right: 22px; bottom: 14px;
  font-size: 52px; font-weight: 800; line-height: 1; letter-spacing: -2px;
  color: rgba(37, 99, 235, .07); pointer-events: none; user-select: none;
  transition: color var(--trans);
}
.case-card:hover .case-index { color: rgba(37, 99, 235, .13); }

.case-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.case-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; font-size: 25px;
  background: linear-gradient(135deg, #eef4ff, #e6fbff);
  transition: transform var(--trans);
}
.case-card:hover .case-icon { transform: scale(1.06) rotate(-3deg); }
.case-tag {
  font-size: 12px; font-weight: 700; color: var(--c-primary-dark);
  background: rgba(37,99,235,.09); padding: 5px 12px; border-radius: 999px;
  white-space: nowrap;
}
.case-title {
  font-size: 18px; line-height: 1.45; margin-bottom: 10px;
  transition: color var(--trans);
}
.case-card:hover .case-title { color: var(--c-primary-dark); }
.case-desc { color: var(--c-muted); font-size: 14.5px; }

/* ---------- About ---------- */
.about-wrap { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.about-text .section-tag { margin-bottom: 14px; }
.about-text p { color: var(--c-ink-2); margin-bottom: 16px; }
.about-points { margin: 24px 0 30px; }
.about-points li { position: relative; padding-left: 26px; margin-bottom: 12px; color: var(--c-ink-2); }
.about-points li::before {
  content: "◆"; position: absolute; left: 0; top: 1px; color: var(--c-primary); font-size: 13px;
}
.about-points strong { color: var(--c-ink); }

.about-visual { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.about-metric {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 30px 20px; text-align: center; box-shadow: var(--shadow-sm);
  transition: var(--trans);
}
.about-metric:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.about-metric .num {
  display: block; font-size: 32px; font-weight: 800; letter-spacing: -1px;
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.about-metric .lbl { font-size: 13.5px; color: var(--c-muted); }

/* ---------- Contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 1.08fr .92fr; gap: 28px; align-items: stretch; }
.contact-qr {
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  border: 1px solid var(--c-line); border-radius: 20px;
  padding: 46px 34px; box-shadow: var(--shadow-md);
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
}
.contact-qr::before {
  content: ""; position: absolute; width: 340px; height: 340px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,.16), transparent 70%);
  top: -50px; left: 50%; transform: translateX(-50%);
}
.contact-qr .chip {
  position: relative; display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px; background: rgba(37,99,235,.08);
  color: var(--c-primary); font-size: 13.5px; font-weight: 700; letter-spacing: 1px;
}
.contact-qr .chip i { width: 7px; height: 7px; border-radius: 50%; background: var(--c-accent); box-shadow: 0 0 0 4px rgba(6,182,212,.18); }
.contact-qr .box {
  position: relative; margin-top: 28px;
  width: 248px; height: 248px; max-width: 74vw; padding: 15px; background: #fff; border-radius: 20px;
  border: 1px solid var(--c-line); box-shadow: 0 22px 50px rgba(15,23,42,.16);
}
.contact-qr .box img { width: 100%; height: 100%; display: block; border-radius: 12px; }
.contact-qr .cap { position: relative; margin-top: 26px; font-size: 21px; font-weight: 700; color: var(--c-ink); letter-spacing: 1px; }
.contact-qr .cap2 { position: relative; margin-top: 8px; font-size: 13.5px; color: var(--c-muted); letter-spacing: 1px; }

.contact-info {
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, #0f172a, #1e293b);
  color: #e2e8f0; border-radius: 20px; padding: 40px 34px;
  box-shadow: var(--shadow-md); display: flex; flex-direction: column;
}
.contact-info::after {
  content: ""; position: absolute; right: -70px; top: -70px; width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,.22), transparent 70%);
}
.contact-info h3 { position: relative; font-size: 20px; color: #fff; margin-bottom: 9px; }
.contact-info .h3-bar { position: relative; width: 44px; height: 3px; border-radius: 2px; margin-bottom: 28px;
  background: linear-gradient(90deg, var(--c-primary-light), var(--c-accent)); }
.info-list { position: relative; display: flex; flex-direction: column; gap: 22px; }
.info-list li { display: flex; gap: 15px; align-items: flex-start; }
.info-icon {
  width: 42px; height: 42px; flex: 0 0 42px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.1); color: #7dd3fc;
}
.info-icon svg { width: 19px; height: 19px; }
.info-list strong { display: block; font-size: 12.5px; color: #94a3b8; font-weight: 600; margin-bottom: 3px; letter-spacing: .5px; }
.info-list p { font-size: 15px; color: #f1f5f9; }
/* ---------- Footer ---------- */
.site-footer { background: #0b1220; color: #94a3b8; padding: 56px 0 0; }
.footer-simple {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  gap: 16px; padding-bottom: 44px;
}
.footer-simple p { font-size: 14px; max-width: 560px; margin: 0 auto; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08); padding: 22px 24px;
  font-size: 13px;
}
.footer-bottom.single { text-align: center; }

/* ---------- Back to top ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 26px; width: 46px; height: 46px; border: 0;
  border-radius: 50%; background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff; font-size: 20px; cursor: pointer; box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: var(--trans); z-index: 900;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-3px); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .about-wrap { grid-template-columns: 1fr; gap: 40px; }
  .contact-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  :root { --header-h: 64px; }
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 40px; }

  /* Mobile nav */
  .hamburger { display: flex; }
  .nav {
    position: fixed; top: 0; right: 0; bottom: 0; width: min(320px, 82vw);
    background: #fff; flex-direction: column; align-items: stretch; gap: 0;
    padding: calc(var(--header-h) + 20px) 22px 30px;
    transform: translateX(100%); transition: transform var(--trans);
    box-shadow: -12px 0 40px rgba(15,23,42,.16); z-index: 1000; overflow-y: auto;
  }
  .nav.open { transform: translateX(0); }
  .nav-list { flex-direction: column; gap: 4px; }
  .nav-link { display: block; padding: 14px 12px; font-size: 16px; border-radius: 10px; }
  .nav-cta { margin-top: 18px; }
}

@media (max-width: 640px) {
  .container { padding: 0 18px; }
  .hero { padding: calc(var(--header-h) + 48px) 0 64px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); margin-top: 44px; }
  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .hero-actions .btn { flex: 1 1 auto; }
  .contact-info { padding: 28px 22px; }
  .contact-qr { padding: 30px 22px; }
  .contact-qr .box { width: 210px; height: 210px; }
  .about-visual { gap: 14px; }
  .about-metric { padding: 22px 14px; }
  .about-metric .num { font-size: 26px; }
  .footer-simple { padding-bottom: 32px; }
  .back-top { right: 16px; bottom: 16px; }
}

@media (max-width: 380px) {
  .hero-title { font-size: 28px; }
  .stat { padding: 20px 12px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}