/* ==========================================================================
   AI 获客门户站 V1 — 样式系统
   主题色集中在 :root 变量，改一处全站生效
   ========================================================================== */

:root {
  --bg: #0b0d12;
  --bg-soft: #11141c;
  --card: #161a25;
  --card-hover: #1c2130;
  --line: #262c3b;
  --text: #e8ecf5;
  --text-soft: #9aa4bb;
  --text-dim: #6b7488;
  --brand: #5b8cff;
  --brand-soft: #7ba3ff;
  --brand-dim: rgba(91, 140, 255, 0.12);
  --accent: #ffb84d;
  --ok: #3ecf8e;
  --err: #ff6b6b;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--brand-soft); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* 无障碍：跳转到主内容 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 10px 16px;
  z-index: 999;
}
.skip-link:focus { left: 8px; top: 8px; }

/* 键盘焦点可见 */
:focus-visible {
  outline: 2px solid var(--brand-soft);
  outline-offset: 2px;
}

/* ============================ 顶栏 ============================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 13, 18, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}
.logo:hover { text-decoration: none; }

.logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), #8b5bff);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 800;
  color: #fff;
}

.nav-links {
  display: flex;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--text-soft);
  font-size: 14.5px;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-cta {
  background: var(--brand);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
}
.nav-cta:hover { background: var(--brand-soft); text-decoration: none; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 16px;
}

/* ============================ Hero ============================ */
.hero {
  padding: 76px 0 64px;
  background:
    radial-gradient(900px 400px at 15% -10%, rgba(91, 140, 255, 0.16), transparent),
    radial-gradient(700px 380px at 85% 0%, rgba(139, 91, 255, 0.12), transparent);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 52px;
  align-items: start;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-dim);
  border: 1px solid rgba(91, 140, 255, 0.28);
  color: var(--brand-soft);
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1.25;
  margin: 0 0 18px;
  letter-spacing: -0.5px;
}

.hero .lead {
  font-size: 17px;
  color: var(--text-soft);
  margin: 0 0 28px;
  max-width: 34em;
}

.hero-points {
  list-style: none;
  padding: 0;
  margin: 0 0 30px;
  display: grid;
  gap: 10px;
}
.hero-points li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 15px;
  color: var(--text-soft);
}
.hero-points .tick { color: var(--ok); flex: none; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ============================ 按钮 ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.16s, border-color 0.16s, opacity 0.16s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-soft); text-decoration: none; }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--text-dim); text-decoration: none; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

/* ============================ 领取卡片 ============================ */
.claim-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}

.claim-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}
.claim-head h2 { font-size: 19px; margin: 0; }

.quota {
  font-size: 12.5px;
  color: var(--accent);
  background: rgba(255, 184, 77, 0.1);
  border: 1px solid rgba(255, 184, 77, 0.25);
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.claim-desc {
  font-size: 14px;
  color: var(--text-dim);
  margin: 0 0 20px;
}

/* 领取卡片内的按钮组 */
.claim-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}
.claim-actions .btn-block { width: 100%; }

.claim-note {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0 0 4px;
  opacity: 0.85;
}

/* 步骤指示 */
.steps {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  font-size: 12.5px;
  color: var(--text-dim);
}
.step {
  display: flex;
  align-items: center;
  gap: 6px;
}
.step-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: 11px;
  flex: none;
}
.step.active { color: var(--text); }
.step.active .step-num {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}
.step.done .step-num {
  background: var(--ok);
  border-color: var(--ok);
  color: #06231a;
}
.step-line { flex: 1; height: 1px; background: var(--line); min-width: 12px; }

/* 表单 */
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 13.5px;
  color: var(--text-soft);
  margin-bottom: 7px;
}
.field input[type='text'],
.field input[type='tel'],
.field input[type='email'],
.field select {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
}
.field input::placeholder { color: var(--text-dim); }
.field input:focus,
.field select:focus {
  border-color: var(--brand);
  outline: none;
}
.field input[aria-invalid='true'] { border-color: var(--err); }

.field-hint { font-size: 12.5px; color: var(--text-dim); margin-top: 6px; }

.consent {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 16px;
  cursor: pointer;
}
.consent input { margin-top: 4px; flex: none; }

.form-msg {
  font-size: 13.5px;
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  display: none;
}
.form-msg.show { display: block; }
.form-msg.error {
  color: #ffc9c9;
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.28);
}
.form-msg.success {
  color: #b6f2d8;
  background: rgba(62, 207, 142, 0.1);
  border: 1px solid rgba(62, 207, 142, 0.28);
}

.privacy-note {
  font-size: 12px;
  color: var(--text-dim);
  margin: 14px 0 0;
  text-align: center;
}

.pane { display: none; }
.pane.active { display: block; }

/* 成功态 */
.success-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(62, 207, 142, 0.14);
  color: var(--ok);
  display: grid;
  place-items: center;
  font-size: 22px;
  margin: 0 auto 14px;
}
.pane-done { text-align: center; }
.pane-done h3 { margin: 0 0 8px; font-size: 18px; }
.pane-done p { color: var(--text-soft); font-size: 14px; margin: 0 0 20px; }

/* ============================ 通用区块 ============================ */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-soft); }

.section-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.section-head h2 {
  font-size: clamp(24px, 3.2vw, 32px);
  margin: 0 0 12px;
  letter-spacing: -0.3px;
}
.section-head p { color: var(--text-soft); margin: 0; font-size: 15.5px; }

/* 痛点 */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.pain-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.pain-card .ico { font-size: 22px; margin-bottom: 12px; }
.pain-card h3 { font-size: 16px; margin: 0 0 8px; }
.pain-card p { font-size: 14px; color: var(--text-soft); margin: 0; }

/* 课程安排事实条 */
.facts {
  list-style: none;
  padding: 0;
  margin: 0 0 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
}
.facts li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-align: center;
}
.facts strong {
  display: block;
  font-size: 20px;
  color: var(--brand-soft);
  margin-bottom: 5px;
  letter-spacing: -0.2px;
}
.facts span { font-size: 13px; color: var(--text-soft); }

/* 三大主线工具 */
.tools-wrap { margin: 0 0 40px; }
.tools-title {
  font-size: 16px;
  margin: 0 0 16px;
  color: var(--text-soft);
  font-weight: 600;
  text-align: center;
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.tool-card h4 {
  font-size: 16px;
  margin: 0 0 7px;
  font-family: var(--mono, ui-monospace, SFMono-Regular, Menlo, monospace);
}
.tool-card p { font-size: 13.5px; color: var(--text-soft); margin: 0; line-height: 1.6; }

/* 配图：hero 主视觉 / 资料包封面 / 工具图标 */
.hero-figure {
  margin: 32px 0 0;
}
.hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.pack-figure { margin: 0 0 24px; }
.pack-figure img {
  display: block;
  width: 96px;
  height: 96px;
}

.tool-ico {
  display: block;
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
}

/* 24 节分节大纲 */
.curriculum { margin-top: 48px; }
.curriculum-head { text-align: center; margin-bottom: 28px; }
.curriculum-head h3 { font-size: 22px; margin: 0 0 8px; }
.curriculum-head p { font-size: 14.5px; color: var(--text-soft); margin: 0; }

.module {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 18px;
}
.module-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.module-idx {
  font-size: 26px;
  font-weight: 700;
  color: var(--brand);
  opacity: 0.5;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.module-head h4 {
  font-size: 18px;
  margin: 0 0 5px;
  font-family: var(--mono, ui-monospace, SFMono-Regular, Menlo, monospace);
}
.module-meta { font-size: 13.5px; color: var(--text-soft); margin: 0; line-height: 1.6; }

.lesson-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px 24px;
}
.lesson-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.lesson-n {
  font-size: 12px;
  color: var(--brand-soft);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
  min-width: 20px;
}
.lesson-title {
  display: block;
  font-size: 14.5px;
  margin-bottom: 3px;
}
.lesson-out {
  display: block;
  font-size: 12.5px;
  color: var(--ok, #4ec9a0);
  opacity: 0.85;
  line-height: 1.5;
}

@media (max-width: 560px) {
  .lesson-list { grid-template-columns: 1fr; }
}

/* 课程 */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}
.course-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.16s, background 0.16s;
}
.course-card:hover { border-color: var(--brand); background: var(--card-hover); }

.badge {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 11px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.badge-recorded {
  background: var(--brand-dim);
  color: var(--brand-soft);
  border: 1px solid rgba(91, 140, 255, 0.28);
}
.badge-live {
  background: rgba(255, 184, 77, 0.1);
  color: var(--accent);
  border: 1px solid rgba(255, 184, 77, 0.28);
}

.course-card h3 { font-size: 19px; margin: 0 0 10px; }
.course-card > p { font-size: 14.5px; color: var(--text-soft); margin: 0 0 18px; }

.course-points {
  list-style: none;
  padding: 0;
  margin: 0 0 22px;
  display: grid;
  gap: 9px;
  flex: 1;
}
.course-points li {
  font-size: 14px;
  color: var(--text-soft);
  display: flex;
  gap: 9px;
}
.course-points .dot { color: var(--brand); flex: none; }

/* 资料包 */
.pack {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.pack-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 11px; }
.pack-list li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  font-size: 14.5px;
  color: var(--text-soft);
  display: flex;
  gap: 11px;
}
.pack-list .num {
  color: var(--brand);
  font-weight: 700;
  font-size: 13px;
  flex: none;
}

/* 二维码 */
.pack-cta {
  text-align: center;
  padding-top: 56px;
  margin-top: 12px;
  border-top: 1px solid var(--line);
}
.pack-cta h2 { font-size: clamp(22px, 3vw, 30px); margin: 0 0 12px; }
.pack-cta p { color: var(--text-soft); margin: 0 0 22px; font-size: 15.5px; }

.qr-wrap { text-align: center; }
.qr-box {
  width: 178px;
  height: 178px;
  margin: 0 auto 18px;
  background: var(--card);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  position: relative;
  color: var(--text-dim);
  font-size: 13px;
}
.qr-ribbon {
  position: absolute;
  bottom: 12px;
  background: rgba(255, 184, 77, 0.14);
  color: var(--accent);
  border: 1px solid rgba(255, 184, 77, 0.3);
  font-size: 11.5px;
  padding: 3px 10px;
  border-radius: 999px;
}
.qr-label { font-size: 15px; font-weight: 600; margin: 0 0 6px; }
.qr-desc { font-size: 13.5px; color: var(--text-dim); margin: 0; max-width: 30em; margin-inline: auto; }

/* FAQ */
.faq { max-width: 780px; margin: 0 auto; display: grid; gap: 12px; }
.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}
.faq summary {
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; float: right; color: var(--text-dim); }
.faq details[open] summary::after { content: '−'; }
.faq details p { font-size: 14.5px; color: var(--text-soft); margin: 12px 0 0; }

/* 底部 CTA */
.final-cta { text-align: center; padding: 76px 0; }
.final-cta h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 14px; }
.final-cta p { color: var(--text-soft); margin: 0 0 26px; font-size: 16px; }

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  font-size: 13px;
  color: var(--text-dim);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* dev 提示条 */
.dev-banner {
  background: rgba(255, 184, 77, 0.1);
  border-bottom: 1px solid rgba(255, 184, 77, 0.25);
  color: var(--accent);
  font-size: 12.5px;
  text-align: center;
  padding: 7px 16px;
}

/* ============================ 响应式 ============================ */
@media (max-width: 900px) {
  .hero-grid, .pack { grid-template-columns: 1fr; gap: 34px; }
  .nav-links {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--line);
    padding: 8px 20px 14px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 11px 0; }
  .nav-toggle { display: block; }
  .hero { padding: 48px 0 40px; }
  .section { padding: 54px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ============================ 留资弹框 modal ============================ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 20px;
}
.modal[hidden] { display: none; }

.modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(10, 12, 16, 0.72);
  backdrop-filter: blur(2px);
}

.modal-box {
  position: relative;
  width: 100%;
  max-width: 420px;
  background: var(--card, #161a25);
  border: 1px solid var(--line, #2a2f3d);
  border-radius: var(--radius, 14px);
  padding: 28px 26px 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

.modal-box h3 { margin: 0 0 6px; font-size: 20px; }
.modal-desc { font-size: 14px; color: var(--text-dim, #8b93a7); margin: 0 0 20px; }

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-dim, #8b93a7);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}
.modal-close:hover { color: var(--text, #e6e9f0); }

.modal-box .field input[type='tel'],
.modal-box .field input[type='email'] {
  width: 100%;
}

/* 必填 / 选填标记 */
.req { color: var(--err, #ff6b6b); font-weight: 700; }
.opt { color: var(--text-dim, #8b93a7); font-weight: 400; font-size: 12px; }

body.modal-open { overflow: hidden; }

/* ============================ 成功 toast ============================ */
.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%) translateY(20px);
  background: #1c2b21;
  color: #7ef0b0;
  border: 1px solid rgba(62, 207, 142, 0.35);
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 300;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 480px) {
  .modal-box { padding: 24px 20px 20px; }
}