/* ── 品牌色覆盖（由 generate_site.py 自动注入）── */
:root {
  --brand-primary:   #1A56DB;
  --brand-secondary: #0E9F6E;
  --brand-accent:    #FF5A1F;
  --brand-dark:      #111928;
  --brand-darker:    #0D1526;
}

/* ================================================================
   BRAND WEBSITE - Responsive Stylesheet
   CSS 变量通过 generate_site.py 替换品牌色
================================================================ */
:root {
  --brand-primary:   #1A56DB;
  --brand-secondary: #0E9F6E;
  --brand-accent:    #FF5A1F;
  --brand-dark:      #111928;
  --brand-darker:    #0D1526;
  --brand-light:     #F9FAFB;
  --brand-text:      #111928;
  --brand-muted:     #6B7280;
  --brand-border:    #E5E7EB;
  --brand-white:     #FFFFFF;
  --font-main: 'Inter','Noto Sans SC',sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.14);
  --transition: all .25s cubic-bezier(.4,0,.2,1);
  --max-width: 1200px;
  --nav-height: 70px;
}

/* Reset */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; }
body { font-family:var(--font-main); color:var(--brand-text); background:var(--brand-white); line-height:1.6; overflow-x:hidden; }
img { max-width:100%; display:block; }
a { text-decoration:none; color:inherit; }
ul { list-style:none; }
button { cursor:pointer; border:none; background:none; font-family:inherit; }

/* Layout */
.container { max-width:var(--max-width); margin:0 auto; padding:0 24px; }
.section-header { text-align:center; margin-bottom:56px; }
.section-header h2 { font-size:clamp(1.8rem,3vw,2.6rem); font-weight:700; color:var(--brand-dark); margin:12px 0 16px; line-height:1.25; }
.section-header p { font-size:1.05rem; color:var(--brand-muted); max-width:560px; margin:0 auto; }
.section-tag {
  display:inline-block;
  background:color-mix(in srgb,var(--brand-primary) 10%,transparent);
  color:var(--brand-primary);
  font-size:.8rem; font-weight:600; letter-spacing:.08em; text-transform:uppercase;
  padding:5px 14px; border-radius:99px;
  border:1px solid color-mix(in srgb,var(--brand-primary) 25%,transparent);
}

/* Buttons */
.btn { display:inline-flex; align-items:center; gap:8px; padding:13px 28px; border-radius:var(--radius-md); font-size:.95rem; font-weight:600; transition:var(--transition); cursor:pointer; }
.btn-primary { background:var(--brand-primary); color:#fff; box-shadow:0 4px 14px color-mix(in srgb,var(--brand-primary) 40%,transparent); }
.btn-primary:hover { filter:brightness(1.1); transform:translateY(-2px); }
.btn-outline { background:transparent; color:#fff; border:2px solid rgba(255,255,255,.5); }
.btn-outline:hover { background:rgba(255,255,255,.12); border-color:rgba(255,255,255,.9); transform:translateY(-2px); }
.btn-full { width:100%; justify-content:center; }

/* ── Navbar ─────────────────────────────────────────────── */
.navbar { position:fixed; top:0; left:0; right:0; height:var(--nav-height); z-index:1000; transition:var(--transition); }
.navbar.scrolled { background:rgba(255,255,255,.96); backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px); box-shadow:var(--shadow-sm); }
.nav-container { max-width:var(--max-width); margin:0 auto; padding:0 24px; height:100%; display:flex; align-items:center; gap:16px; }
.nav-logo { display:flex; align-items:center; gap:10px; font-size:1.15rem; font-weight:700; color:#fff; flex-shrink:0; transition:var(--transition); }
.navbar.scrolled .nav-logo { color:var(--brand-dark); }
.logo-icon { font-size:1.5rem; line-height:1; }
.nav-links { display:flex; gap:4px; margin-left:auto; }
.nav-links a { padding:8px 14px; border-radius:var(--radius-sm); font-size:.9rem; font-weight:500; color:rgba(255,255,255,.85); transition:var(--transition); }
.nav-links a:hover { color:#fff; background:rgba(255,255,255,.12); }
.navbar.scrolled .nav-links a { color:var(--brand-muted); }
.navbar.scrolled .nav-links a:hover { color:var(--brand-primary); background:color-mix(in srgb,var(--brand-primary) 8%,transparent); }
.nav-cta { padding:9px 20px; background:var(--brand-primary); color:#fff; border-radius:var(--radius-md); font-size:.88rem; font-weight:600; transition:var(--transition); flex-shrink:0; display:flex; align-items:center; }
.nav-cta:hover { filter:brightness(1.12); transform:translateY(-1px); }
.hamburger { display:none; flex-direction:column; gap:5px; padding:6px; margin-left:auto; }
.hamburger span { display:block; width:22px; height:2px; background:#fff; border-radius:2px; transition:var(--transition); }
.navbar.scrolled .hamburger span { background:var(--brand-dark); }
.hamburger.open span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity:0; }
.hamburger.open span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  min-height:100vh;
  padding:calc(var(--nav-height) + 80px) 24px 80px;
  background:linear-gradient(135deg, var(--brand-darker) 0%, var(--brand-dark) 100%);
  display:flex; align-items:center; justify-content:center; gap:64px;
  position:relative; overflow:hidden;
}
.hero-bg {
  position:absolute; inset:0;
  background:
    radial-gradient(ellipse at 20% 50%, color-mix(in srgb,var(--brand-primary) 20%,transparent) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, color-mix(in srgb,var(--brand-accent) 10%,transparent) 0%, transparent 50%);
  pointer-events:none;
}
.hero-content { max-width:580px; position:relative; z-index:1; }
.hero-badge {
  display:inline-block;
  background:color-mix(in srgb,var(--brand-primary) 25%,transparent);
  color:color-mix(in srgb,var(--brand-primary) 50%,#fff);
  border:1px solid color-mix(in srgb,var(--brand-primary) 40%,transparent);
  padding:6px 16px; border-radius:99px; font-size:.82rem; font-weight:600; letter-spacing:.06em; margin-bottom:24px;
}
.hero-title { font-size:clamp(2.2rem,5vw,3.6rem); font-weight:800; color:#fff; line-height:1.18; margin-bottom:20px; letter-spacing:-.02em; }
.hero-title .highlight { color:var(--brand-primary); }
.hero-subtitle { font-size:1.1rem; color:rgba(255,255,255,.7); margin-bottom:36px; line-height:1.7; }
.hero-actions { display:flex; gap:14px; flex-wrap:wrap; margin-bottom:48px; }
.hero-stats { display:flex; align-items:center; gap:24px; padding:20px 0; border-top:1px solid rgba(255,255,255,.1); }
.stat { text-align:center; }
.stat-num { display:block; font-size:1.8rem; font-weight:800; color:#fff; line-height:1; margin-bottom:4px; }
.stat-label { font-size:.82rem; color:rgba(255,255,255,.55); }
.stat-divider { width:1px; height:40px; background:rgba(255,255,255,.15); }
.hero-visual { position:relative; flex-shrink:0; width:320px; height:320px; z-index:1; }
.hero-card {
  position:absolute;
  background:rgba(255,255,255,.06); backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.12); border-radius:var(--radius-lg);
  padding:20px 24px; min-width:180px;
}
.card-float { top:40px; left:0; animation:float 3s ease-in-out infinite; }
.card-float-delay { bottom:40px; right:0; animation:float 3s ease-in-out infinite .8s; }
.card-icon { font-size:2rem; margin-bottom:8px; }
.card-text { font-size:.88rem; color:rgba(255,255,255,.85); font-weight:500; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }

/* ── About ──────────────────────────────────────────────── */
.about { padding:100px 0; background:var(--brand-light); }
.about-grid { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; }
.about-content p { font-size:1.05rem; color:var(--brand-muted); line-height:1.8; margin-bottom:28px; }
.about-features { display:flex; flex-direction:column; gap:14px; }
.about-features li { display:flex; align-items:center; gap:12px; font-size:.95rem; color:var(--brand-text); font-weight:500; }
.check { display:inline-flex; align-items:center; justify-content:center; width:22px; height:22px; background:var(--brand-secondary); color:#fff; border-radius:50%; font-size:.75rem; flex-shrink:0; }
.about-visual { display:flex; justify-content:center; }
.about-card {
  background:var(--brand-white); border-radius:var(--radius-lg); padding:40px;
  text-align:center; box-shadow:var(--shadow-lg); border:1px solid var(--brand-border);
  max-width:340px;
}
.about-icon { font-size:3.5rem; margin-bottom:20px; }
.about-card h3 { font-size:1.3rem; font-weight:700; margin-bottom:12px; color:var(--brand-dark); }
.about-card p { color:var(--brand-muted); font-size:.95rem; line-height:1.7; }

/* ── Services ───────────────────────────────────────────── */
.services { padding:100px 0; background:var(--brand-white); }
.services-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.service-card {
  background:var(--brand-light); border:1px solid var(--brand-border); border-radius:var(--radius-lg);
  padding:32px; position:relative; transition:var(--transition);
}
.service-card:hover { transform:translateY(-6px); box-shadow:var(--shadow-md); border-color:color-mix(in srgb,var(--brand-primary) 30%,transparent); }
.service-card.featured { background:var(--brand-primary); border-color:var(--brand-primary); }
.service-card.featured h3, .service-card.featured p { color:#fff; }
.service-card.featured .service-icon { background:rgba(255,255,255,.15); }
.service-badge { position:absolute; top:16px; right:16px; background:var(--brand-accent); color:#fff; font-size:.72rem; font-weight:700; padding:4px 10px; border-radius:99px; letter-spacing:.05em; }
.service-icon { width:52px; height:52px; background:color-mix(in srgb,var(--brand-primary) 10%,transparent); border-radius:var(--radius-md); display:flex; align-items:center; justify-content:center; font-size:1.5rem; margin-bottom:20px; }
.service-card h3 { font-size:1.1rem; font-weight:700; margin-bottom:10px; color:var(--brand-dark); }
.service-card p { font-size:.9rem; color:var(--brand-muted); line-height:1.7; }

/* ── Cases ──────────────────────────────────────────────── */
.cases { padding:100px 0; background:var(--brand-light); }
.cases-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.case-card {
  background:var(--brand-white); border:1px solid var(--brand-border); border-radius:var(--radius-lg);
  padding:36px; transition:var(--transition);
}
.case-card:hover { transform:translateY(-6px); box-shadow:var(--shadow-md); }
.case-num { font-size:3rem; font-weight:800; color:color-mix(in srgb,var(--brand-primary) 15%,transparent); line-height:1; margin-bottom:16px; }
.case-card h3 { font-size:1.15rem; font-weight:700; margin-bottom:12px; color:var(--brand-dark); }
.case-card p { font-size:.93rem; color:var(--brand-muted); line-height:1.7; margin-bottom:20px; }
.case-link { color:var(--brand-primary); font-size:.9rem; font-weight:600; transition:var(--transition); }
.case-link:hover { letter-spacing:.02em; }

/* ── Contact ────────────────────────────────────────────── */
.contact { padding:100px 0; background:var(--brand-white); }
.contact-grid { display:grid; grid-template-columns:1fr 1.4fr; gap:64px; align-items:start; }
.info-item { display:flex; gap:16px; align-items:flex-start; margin-bottom:32px; }
.info-icon { font-size:1.4rem; flex-shrink:0; margin-top:2px; }
.info-item strong { display:block; font-size:.85rem; font-weight:600; color:var(--brand-muted); letter-spacing:.06em; text-transform:uppercase; margin-bottom:4px; }
.info-item p { font-size:.98rem; color:var(--brand-text); }
.contact-form { display:flex; flex-direction:column; gap:16px; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.contact-form input,
.contact-form textarea {
  width:100%; padding:14px 16px; border:1.5px solid var(--brand-border); border-radius:var(--radius-md);
  font-size:.95rem; font-family:var(--font-main); color:var(--brand-text); background:var(--brand-light);
  transition:var(--transition); outline:none;
}
.contact-form input:focus,
.contact-form textarea:focus { border-color:var(--brand-primary); background:#fff; box-shadow:0 0 0 3px color-mix(in srgb,var(--brand-primary) 15%,transparent); }
.contact-form textarea { resize:vertical; min-height:120px; }

/* ── Footer ─────────────────────────────────────────────── */
.footer { background:var(--brand-darker); padding:64px 0 32px; }
.footer-grid { display:grid; grid-template-columns:1.6fr 1fr 1.2fr; gap:48px; margin-bottom:48px; }
.footer-brand .nav-logo { color:#fff; margin-bottom:16px; }
.footer-brand p { font-size:.9rem; color:rgba(255,255,255,.5); line-height:1.7; max-width:280px; }
.footer-links h4, .footer-contact h4 { font-size:.85rem; font-weight:600; color:rgba(255,255,255,.4); letter-spacing:.08em; text-transform:uppercase; margin-bottom:20px; }
.footer-links ul { display:flex; flex-direction:column; gap:10px; }
.footer-links a { font-size:.9rem; color:rgba(255,255,255,.6); transition:var(--transition); }
.footer-links a:hover { color:#fff; }
.footer-contact p { font-size:.9rem; color:rgba(255,255,255,.55); line-height:1.8; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.08); padding-top:24px; text-align:center; }
.footer-bottom p { font-size:.85rem; color:rgba(255,255,255,.35); }

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width:900px) {
  .hero { flex-direction:column; text-align:center; gap:40px; padding-top:calc(var(--nav-height) + 60px); }
  .hero-actions { justify-content:center; }
  .hero-stats { justify-content:center; }
  .hero-visual { width:260px; height:220px; }
  .about-grid { grid-template-columns:1fr; gap:40px; }
  .services-grid { grid-template-columns:repeat(2,1fr); }
  .cases-grid { grid-template-columns:1fr 1fr; }
  .contact-grid { grid-template-columns:1fr; gap:40px; }
  .footer-grid { grid-template-columns:1fr 1fr; gap:32px; }
}
@media (max-width:768px) {
  .nav-links { display:none; flex-direction:column; position:fixed; top:var(--nav-height); left:0; right:0; background:#fff; padding:16px 24px 24px; box-shadow:var(--shadow-md); gap:4px; }
  .nav-links.open { display:flex; }
  .nav-links a { color:var(--brand-text) !important; padding:12px 16px; }
  .nav-cta { display:none; }
  .hamburger { display:flex; }
  .services-grid { grid-template-columns:1fr; }
  .cases-grid { grid-template-columns:1fr; }
  .form-row { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
}
@media (max-width:480px) {
  .hero-visual { display:none; }
  .hero-stats { flex-wrap:wrap; gap:16px; }
  .stat-divider { display:none; }
}