:root {
  --color-primary: #4A2C2A;      /* 深焙咖啡棕 */
  --color-secondary: #C8956C;    /* 焦糖榛果 */
  --color-accent: #D4A574;       /* 燕麦奶咖 */
  --color-bg-main: #FDF8F3;      /* 奶油白 */
  --color-bg-card: #F5EDE4;      /* 亚麻米色 */
  --color-text-dark: #2D1810;    /* 深咖啡黑 */
  --color-text-muted: #7A5C52;   /* 中焙灰 */
  --color-bg-dark: #1A0F0E;      /* 深色模块 */
  --shadow-sm: 0 2px 8px rgba(45, 24, 16, .06);
  --shadow-md: 0 10px 30px rgba(45, 24, 16, .10);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Noto Sans SC", "Inter", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text-dark);
  background: var(--color-bg-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: "Noto Serif SC", serif; line-height: 1.25; color: var(--color-primary); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 999px;
  font-weight: 600; font-size: .95rem; cursor: pointer; border: 1.5px solid transparent;
  transition: transform .15s ease, background .2s ease, color .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: #3a221f; box-shadow: var(--shadow-md); }
.btn-ghost { border-color: #fff; color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.15); }
.btn-light { background: var(--color-bg-main); color: var(--color-primary); }
.btn-light:hover { box-shadow: var(--shadow-md); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(253, 248, 243, .9); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(74, 44, 42, .08);
  transition: box-shadow .2s ease, background .2s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { font-size: 1.5rem; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-family: "Noto Serif SC", serif; font-size: 1.15rem; color: var(--color-primary); }
.brand-text em { font-style: normal; font-size: .68rem; letter-spacing: 2px; color: var(--color-text-muted); }
.site-nav { display: flex; gap: 26px; }
.site-nav a { font-size: .95rem; font-weight: 500; color: var(--color-text-dark); position: relative; padding: 4px 0; }
.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px;
  background: var(--color-secondary); transition: width .2s ease;
}
.site-nav a:hover::after, .site-nav a.active::after { width: 100%; }
.site-nav a.active { color: var(--color-primary); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-primary); transition: .25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: 78vh; display: flex; align-items: center;
  background-size: cover; background-position: center; color: #fff;
}
.hero-inner { padding: 60px 0; max-width: 720px; }
.hero-eyebrow { letter-spacing: 3px; text-transform: uppercase; font-size: .8rem; opacity: .9; margin-bottom: 14px; }
.hero-title { font-size: clamp(2rem, 5vw, 3.4rem); color: #fff; text-shadow: 0 2px 18px rgba(0,0,0,.35); }
.hero-sub { margin: 18px 0 28px; font-size: 1.1rem; opacity: .95; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Sections ---------- */
.section { padding: 76px 0; }
.section-alt { background: var(--color-bg-card); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.section-kicker { display: inline-block; color: var(--color-secondary); font-weight: 600; letter-spacing: 2px; font-size: .8rem; margin-bottom: 10px; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.section-lead { margin-top: 12px; color: var(--color-text-muted); }

/* ---------- Grid & Cards ---------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.card-media { aspect-ratio: 4 / 3; overflow: hidden; background: var(--color-bg-card); position: relative; }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card-media img { transform: scale(1.05); }
.card-body { padding: 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-body h3 { font-size: 1.2rem; }
.card-desc { color: var(--color-text-muted); font-size: .92rem; }
.card-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--color-bg-card); color: var(--color-primary);
}
.card-icon svg { width: 24px; height: 24px; }
.card-link { margin-top: auto; color: var(--color-primary); font-weight: 600; font-size: .9rem; }
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.feature-list li { position: relative; padding-left: 20px; font-size: .9rem; color: var(--color-text-muted); }
.feature-list li::before { content: "☕"; position: absolute; left: 0; font-size: .7rem; top: 3px; }

/* badges */
.badge { position: absolute; top: 12px; left: 12px; padding: 4px 12px; border-radius: 999px; font-size: .75rem; font-weight: 600; color: #fff; background: var(--color-secondary); }
.badge-入门 { background: #8aa37b; }
.badge-进阶 { background: var(--color-accent); }
.badge-专业 { background: var(--color-primary); }
.badge-认证 { background: #b5651d; }
.course-meta { font-size: .82rem; color: var(--color-text-muted); }
.course-cert { font-size: .85rem; color: var(--color-primary); font-weight: 600; }
.course-price { font-size: .95rem; color: var(--color-secondary); font-weight: 700; margin-top: auto; }

/* case cards */
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.tag { font-size: .72rem; padding: 3px 10px; border-radius: 999px; font-weight: 600; }
.tag-type { background: var(--color-bg-card); color: var(--color-primary); }
.tag-service { background: rgba(200,149,108,.18); color: #9a6a40; }
.case-customer { font-size: .8rem; color: var(--color-text-muted); }

/* timeline */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--color-accent); }
.timeline-item { position: relative; padding: 0 0 26px 22px; }
.timeline-dot { position: absolute; left: -28px; top: 4px; width: 16px; height: 16px; border-radius: 50%; background: var(--color-primary); border: 3px solid var(--color-bg-main); box-shadow: 0 0 0 2px var(--color-accent); }
.timeline-dot[data-type="certification"] { background: #b5651d; }
.timeline-dot[data-type="center"] { background: var(--color-secondary); }
.timeline-date { font-size: .8rem; font-weight: 600; color: var(--color-secondary); letter-spacing: 1px; }
.timeline-event { color: var(--color-text-dark); }

/* split layout */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split-media img { width: 100%; border-radius: var(--radius); box-shadow: var(--shadow-md); }
.split-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.split-gallery img:nth-child(3) { grid-column: 1 / -1; }
.split-text h2 { margin-bottom: 14px; }
.split-text p { color: var(--color-text-muted); margin-bottom: 12px; }

/* cta */
.cta { background: var(--color-bg-dark); color: #fff; }
.cta-inner { text-align: center; padding: 64px 20px; }
.cta-inner h2 { color: #fff; font-size: clamp(1.5rem, 3vw, 2.2rem); }
.cta-inner p { opacity: .85; margin: 12px 0 24px; }

/* footer */
.site-footer { background: var(--color-primary); color: #f3e9e2; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.4fr; gap: 32px; padding: 54px 20px 30px; }
.footer-brand .brand-mark { font-size: 1.8rem; }
.footer-slogan { font-family: "Noto Serif SC", serif; font-size: 1.1rem; margin: 10px 0 6px; color: #fff; }
.footer-culture { font-size: .85rem; opacity: .8; }
.footer-col h4 { color: #fff; margin-bottom: 12px; font-size: .98rem; }
.footer-col a, .footer-col p { display: block; font-size: .88rem; opacity: .85; margin-bottom: 8px; }
.footer-col a:hover { opacity: 1; color: var(--color-accent); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 18px 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: .8rem; opacity: .7; }

/* page hero */
.page-hero { background: linear-gradient(135deg, var(--color-primary), #6b4036); color: #fff; padding: 90px 0 70px; }
.page-hero .section-kicker { color: var(--color-accent); }
.page-title { color: #fff; font-size: clamp(1.8rem, 4vw, 2.6rem); }
.page-lead { opacity: .9; margin-top: 10px; }

/* service detail */
.service-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 30px 0; border-bottom: 1px solid rgba(74,44,42,.08); }
.service-detail:last-child { border-bottom: 0; }
.service-detail:nth-child(even) .service-detail-media { order: 2; }
.service-detail-media img { width: 100%; border-radius: var(--radius); box-shadow: var(--shadow-md); }
.service-detail-text h2 { margin: 10px 0; }
.service-short { color: var(--color-secondary); font-weight: 600; margin-bottom: 10px; }
.service-detail-text .card-icon { margin-bottom: 8px; }

/* qualifications */
.qual-card { padding: 26px; text-align: center; }
.qual-card h3 { margin-bottom: 8px; }
.qual-card p { color: var(--color-text-muted); font-size: .9rem; }

/* team */
.team-card { align-items: center; text-align: center; padding: 24px; }
.team-avatar { width: 96px; height: 96px; border-radius: 50%; overflow: hidden; margin-bottom: 14px; background: var(--color-bg-card); }
.team-avatar img { width: 100%; height: 100%; object-fit: cover; }
.team-role { color: var(--color-secondary); font-weight: 600; font-size: .85rem; margin-bottom: 8px; }

/* case filter */
.case-filter { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn { padding: 9px 20px; border-radius: 999px; border: 1.5px solid var(--color-accent); background: #fff; color: var(--color-primary); font-weight: 600; cursor: pointer; transition: .2s; }
.filter-btn:hover, .filter-btn.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.case-card.hide { display: none; }

/* contact */
.contact-list { list-style: none; display: flex; flex-direction: column; gap: 14px; margin: 8px 0 16px; }
.contact-list li { display: flex; gap: 12px; align-items: baseline; }
.contact-list span { min-width: 64px; color: var(--color-secondary); font-weight: 600; }
.contact-note { font-size: .82rem; color: var(--color-text-muted); }
.contact-form { display: flex; flex-direction: column; gap: 14px; background: #fff; padding: 24px; border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.contact-form label { display: flex; flex-direction: column; gap: 6px; font-size: .85rem; font-weight: 600; color: var(--color-primary); }
.contact-form input, .contact-form select, .contact-form textarea {
  font: inherit; padding: 11px 14px; border: 1.5px solid rgba(74,44,42,.18); border-radius: var(--radius-sm); background: var(--color-bg-main); color: var(--color-text-dark);
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: none; border-color: var(--color-secondary); }

/* error */
.error-section { padding: 120px 0; }
.error-code { font-size: 5rem; color: var(--color-secondary); }
.error-msg { font-size: 1.2rem; color: var(--color-text-muted); margin: 12px 0 26px; }

/* reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split, .service-detail { grid-template-columns: 1fr; gap: 24px; }
  .service-detail:nth-child(even) .service-detail-media { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute; top: 70px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: var(--color-bg-main); border-bottom: 1px solid rgba(74,44,42,.1);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .site-nav.open { max-height: 360px; }
  .site-nav a { padding: 14px 20px; border-top: 1px solid rgba(74,44,42,.06); }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 54px 0; }
}