/* ===== 智汇堂科技 官网样式（Claude 风格：米白 + 陶土橙） ===== */
:root {
  --bg: #faf9f5;
  --bg-2: #f0eee6;
  --card: #ffffff;
  --card-hover: #fffdf9;
  --border: rgba(31, 30, 29, 0.1);
  --text: #1f1e1d;
  --text-dim: #6e6a60;
  --primary: #d97757;
  --primary-2: #bd5d3a;
  --accent: #bd5d3a;
  --gradient: linear-gradient(135deg, #da7756 0%, #bd5d3a 100%);
  --on-primary: #ffffff;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(31, 30, 29, 0.08);
  --font-serif: Georgia, "Noto Serif SC", "Songti SC", SimSun, serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 600; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { width: min(1140px, 92%); margin: 0 auto; }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250, 249, 245, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; font-family: var(--font-serif); }
.logo .logo-mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--gradient);
  display: grid; place-items: center;
  font-size: 18px; color: var(--on-primary);
}
.nav-links { display: flex; gap: 6px; list-style: none; }
.nav-links a {
  padding: 8px 14px; border-radius: 8px;
  color: var(--text-dim); font-size: 15px;
  transition: all 0.2s;
}
.nav-links a:hover { color: var(--text); background: rgba(31, 30, 29, 0.05); }
.nav-links a.active { color: var(--on-primary); background: var(--primary); font-weight: 600; }
.nav-toggle {
  display: none; background: none; border: none; color: var(--text);
  font-size: 26px; cursor: pointer;
}

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  padding: 110px 0 90px;
  text-align: center;
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(217, 119, 87, 0.1), transparent 70%),
    radial-gradient(600px 300px at 80% 10%, rgba(189, 93, 58, 0.08), transparent 70%),
    var(--bg);
}
.hero .badge {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  border: 1px solid rgba(217, 119, 87, 0.35); background: rgba(217, 119, 87, 0.08);
  color: var(--primary-2); font-size: 14px; margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px); line-height: 1.3;
  margin-bottom: 20px;
}
.hero h1 .grad { color: var(--primary); }
.hero p.sub {
  max-width: 640px; margin: 0 auto 36px;
  color: var(--text-dim); font-size: 18px;
}
.btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 32px; border-radius: 12px;
  font-size: 16px; font-weight: 600; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s; border: none;
}
.btn-primary {
  background: var(--primary); color: var(--on-primary);
  box-shadow: 0 6px 18px rgba(217, 119, 87, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); background: var(--primary-2); box-shadow: 0 10px 24px rgba(217, 119, 87, 0.4); }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid rgba(31, 30, 29, 0.25);
}
.btn-ghost:hover { background: rgba(31, 30, 29, 0.05); }

/* ===== 数据条 ===== */
.stats { padding: 40px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-2); }
.stats .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stats .num { font-size: 34px; font-weight: 800; color: var(--primary); font-family: var(--font-serif); }
.stats .label { color: var(--text-dim); font-size: 14px; }

/* ===== 通用 Section ===== */
.section { padding: 80px 0; }
.section.alt { background: var(--bg-2); }
.section-head { text-align: center; margin-bottom: 50px; }
.section-head .kicker { color: var(--primary); font-size: 14px; letter-spacing: 3px; text-transform: uppercase; }
.section-head h2 { font-size: clamp(26px, 3.6vw, 36px); margin: 8px 0 12px; }
.section-head p { color: var(--text-dim); max-width: 560px; margin: 0 auto; }

/* ===== 卡片网格 ===== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 30px;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: rgba(217, 119, 87, 0.4); }
.card .icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: rgba(217, 119, 87, 0.12); display: grid; place-items: center;
  font-size: 24px; margin-bottom: 18px;
}
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 15px; }
.card .link-more { display: inline-block; margin-top: 16px; color: var(--primary-2); font-weight: 600; font-size: 14px; }

/* ===== 老师卡片 ===== */
.teacher-card { text-align: center; }
.avatar {
  width: 96px; height: 96px; border-radius: 50%;
  margin: 0 auto 18px;
  background: var(--gradient);
  display: grid; place-items: center;
  font-size: 34px; font-weight: 700; color: var(--on-primary);
  font-family: var(--font-serif);
  box-shadow: 0 8px 20px rgba(217, 119, 87, 0.3);
}
.teacher-card .role { color: var(--primary-2); font-size: 14px; margin-bottom: 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 16px; }
.tag {
  padding: 4px 12px; border-radius: 999px; font-size: 13px;
  background: rgba(217, 119, 87, 0.1); color: var(--primary-2);
  border: 1px solid rgba(217, 119, 87, 0.3);
}

/* ===== 评价 ===== */
.review-card .stars { color: var(--primary); margin-bottom: 12px; letter-spacing: 2px; }
.review-card .who { display: flex; align-items: center; gap: 12px; margin-top: 18px; }
.review-card .who .avatar { width: 44px; height: 44px; font-size: 17px; margin: 0; box-shadow: none; }
.review-card .who .name { font-weight: 600; font-size: 15px; }
.review-card .who .meta { color: var(--text-dim); font-size: 13px; }

/* ===== FAQ ===== */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; margin-bottom: 14px; overflow: hidden;
}
.faq-q {
  width: 100%; text-align: left; background: none; border: none;
  color: var(--text); font-size: 16px; font-weight: 600;
  font-family: inherit;
  padding: 18px 22px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-q .chev { transition: transform 0.25s; color: var(--primary); flex-shrink: 0; }
.faq-item.open .faq-q .chev { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-a p { padding: 0 22px 18px; color: var(--text-dim); font-size: 15px; }

/* ===== CTA 横幅 ===== */
.cta-banner {
  background: var(--gradient); border-radius: 20px;
  padding: 56px 40px; text-align: center;
  box-shadow: 0 14px 40px rgba(217, 119, 87, 0.3);
  color: var(--on-primary);
}
.cta-banner h2 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 12px; }
.cta-banner p { opacity: 0.92; margin-bottom: 28px; }
.cta-banner .btn { background: #fff; color: var(--primary-2); }

/* ===== 页脚 ===== */
.footer { background: var(--bg-2); border-top: 1px solid var(--border); padding: 56px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 36px; margin-bottom: 36px; }
.footer h4 { font-size: 16px; margin-bottom: 16px; }
.footer p, .footer li, .footer a { color: var(--text-dim); font-size: 14px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a:hover { color: var(--text); }
.copyright { text-align: center; padding-top: 24px; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 13px; }

/* ===== 页面顶部横幅（内页） ===== */
.page-hero {
  padding: 70px 0 56px; text-align: center;
  background:
    radial-gradient(500px 250px at 50% 0%, rgba(217, 119, 87, 0.09), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 12px; }
.page-hero p { color: var(--text-dim); max-width: 620px; margin: 0 auto; }

/* ===== 课程详情 ===== */
.course-card .price { font-size: 26px; font-weight: 800; color: var(--primary); margin: 14px 0 4px; font-family: var(--font-serif); }
.course-card .price small { font-size: 14px; color: var(--text-dim); font-weight: 400; }
.course-card ul { list-style: none; margin: 14px 0; }
.course-card ul li { padding: 5px 0 5px 26px; position: relative; color: var(--text-dim); font-size: 14px; }
.course-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
.ribbon {
  display: inline-block; padding: 3px 12px; border-radius: 999px;
  background: rgba(217, 119, 87, 0.1); color: var(--primary-2);
  font-size: 12px; border: 1px solid rgba(217, 119, 87, 0.3); margin-bottom: 12px;
}

/* ===== 课程大纲 ===== */
.syllabus { max-width: 820px; margin: 0 auto; }
.syllabus-item {
  display: flex; gap: 20px; padding: 22px 0;
  border-bottom: 1px solid var(--border);
}
.syllabus-item .no {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 12px;
  background: var(--gradient); display: grid; place-items: center;
  font-weight: 700; color: var(--on-primary);
}
.syllabus-item h4 { margin-bottom: 4px; }
.syllabus-item p { color: var(--text-dim); font-size: 14px; }

/* ===== AI 工具 ===== */
.tool-card { display: flex; flex-direction: column; }
.tool-card .tool-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.tool-card .tool-logo {
  width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
  display: grid; place-items: center; font-size: 22px; font-weight: 800; color: #fff;
}
.tool-card .tool-head h3 { margin: 0; font-size: 18px; }
.tool-card .tool-head .cat { color: var(--text-dim); font-size: 13px; }
.tool-card p { flex: 1; }
.tool-card .btn { margin-top: 18px; text-align: center; padding: 10px 0; font-size: 14px; }

/* ===== 时间线 ===== */
.timeline { max-width: 700px; margin: 0 auto; position: relative; padding-left: 32px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--primary), var(--primary-2));
}
.timeline-item { position: relative; padding-bottom: 32px; }
.timeline-item::before {
  content: ""; position: absolute; left: -30px; top: 8px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--gradient); box-shadow: 0 0 0 4px rgba(217, 119, 87, 0.18);
}
.timeline-item .year { color: var(--primary-2); font-weight: 700; font-size: 15px; }
.timeline-item p { color: var(--text-dim); font-size: 15px; }

/* ===== 关于页·双栏 ===== */
.about-split { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; align-items: start; }
.about-portrait {
  border-radius: 20px; background: var(--card); border: 1px solid var(--border);
  padding: 40px 28px; text-align: center;
}
.about-portrait .avatar { width: 130px; height: 130px; font-size: 46px; }

/* ===== 新闻列表 ===== */
.news-card .date { color: var(--primary-2); font-size: 13px; margin-bottom: 10px; }
.news-card .thumb {
  height: 150px; border-radius: 12px; margin-bottom: 18px;
  background: linear-gradient(135deg, #f6e2d8 0%, #ecc9b6 100%);
  display: grid; place-items: center; font-size: 40px;
}

/* ===== 联系页 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 36px; align-items: start; }
.contact-info .item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 0; border-bottom: 1px solid var(--border);
}
.contact-info .item .ic {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  background: rgba(217, 119, 87, 0.12); display: grid; place-items: center; font-size: 20px;
}
.contact-info .item h4 { font-size: 15px; margin-bottom: 2px; }
.contact-info .item p { color: var(--text-dim); font-size: 14px; }
.qr-box {
  margin-top: 26px; padding: 24px; border-radius: 16px;
  background: var(--card); border: 1px dashed rgba(217, 119, 87, 0.5);
  text-align: center;
}
.qr-placeholder {
  width: 170px; height: 170px; margin: 0 auto 12px; border-radius: 12px;
  background: repeating-conic-gradient(#f0eee6 0% 25%, #e3dfd3 0% 50%) 0 / 24px 24px;
  display: grid; place-items: center; font-size: 13px; color: var(--text-dim);
  padding: 10px; text-align: center;
}

/* ===== 表单 ===== */
.form-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 34px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; margin-bottom: 8px; color: var(--text-dim); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: var(--bg); border: 1px solid rgba(31, 30, 29, 0.15);
  color: var(--text); font-size: 15px; font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary);
}
.form-success {
  display: none; margin-top: 16px; padding: 14px 18px; border-radius: 10px;
  background: rgba(217, 119, 87, 0.08); border: 1px solid rgba(217, 119, 87, 0.35);
  color: var(--primary-2); font-size: 14px;
}
.form-success.show { display: block; }

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(31, 30, 29, 0.55);
  display: grid; place-items: center;
  opacity: 0; transition: opacity 0.2s;
  padding: 20px;
}
.modal-overlay.show { opacity: 1; }
.modal-card {
  background: var(--card); border-radius: 20px;
  padding: 36px 32px 30px; text-align: center;
  max-width: 360px; width: 100%;
  box-shadow: 0 24px 60px rgba(31, 30, 29, 0.3);
  transform: translateY(12px); transition: transform 0.2s;
  position: relative;
}
.modal-overlay.show .modal-card { transform: translateY(0); }
.modal-close {
  position: absolute; top: 12px; right: 14px;
  background: none; border: none; font-size: 22px;
  color: var(--text-dim); cursor: pointer; line-height: 1;
}
.modal-card h3 { font-size: 20px; margin-bottom: 6px; }
.modal-card .modal-price { font-family: var(--font-serif); font-size: 30px; font-weight: 800; color: var(--primary); margin: 6px 0 2px; }
.modal-card .modal-price small { font-size: 14px; color: var(--text-dim); font-weight: 400; }
.modal-card .modal-sub { color: var(--text-dim); font-size: 14px; margin-bottom: 18px; }
.modal-card img { width: 220px; height: auto; margin: 0 auto 14px; border-radius: 12px; border: 1px solid var(--border); }
.modal-card .modal-note { font-size: 13px; color: var(--text-dim); }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-split, .contact-grid { grid-template-columns: 1fr; }
  .stats .container { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}
@media (max-width: 640px) {
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; padding: 12px 4%;
    background: rgba(250, 249, 245, 0.98); border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero { padding: 70px 0 60px; }
  .section { padding: 56px 0; }
}