/* ============================================================
   OpenClaw QQ 智能体 · 官网样式
   纯静态 / 零依赖 / 移动端优先 / 响应式
   ============================================================ */

:root {
  --blue: #12B7F5;
  --blue-deep: #2D8CFF;
  --cyan: #34E0E0;
  --ink: #0f1622;
  --ink-soft: #36425a;
  --muted: #6b7688;
  --bg: #f6f9ff;
  --bg-card: #ffffff;
  --line: #e6ecf5;
  --shadow: 0 10px 30px rgba(20, 70, 140, 0.08);
  --shadow-hover: 0 18px 44px rgba(20, 90, 180, 0.16);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1120px;
  --grad: linear-gradient(120deg, var(--blue) 0%, var(--blue-deep) 100%);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  white-space: nowrap;
}

.btn--primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 20px rgba(45, 140, 255, 0.32);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(45, 140, 255, 0.42);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.7);
  color: var(--blue-deep);
  border-color: var(--line);
  backdrop-filter: blur(4px);
}

.btn--ghost:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
}

.btn--lg {
  padding: 14px 28px;
  font-size: 16px;
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 249, 255, 0.82);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: 64px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 16px;
  color: var(--ink);
}

.nav__logo b {
  color: var(--blue-deep);
}

.nav__logo-mark {
  display: inline-flex;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--grad);
  color: #fff;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(45, 140, 255, 0.3);
}

.nav__links {
  margin-left: auto;
  display: flex;
  gap: 26px;
  font-size: 15px;
  color: var(--ink-soft);
}

.nav__links a:hover {
  color: var(--blue-deep);
}

.nav__cta {
  margin-left: 8px;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav__toggle span {
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav__mobile {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px 20px 16px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.nav__mobile a {
  padding: 11px 8px;
  font-size: 16px;
  color: var(--ink-soft);
}

.nav__mobile .btn {
  margin-top: 8px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 92px 20px 100px;
  background: radial-gradient(120% 120% at 50% 0%, #eaf4ff 0%, var(--bg) 60%);
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.55;
}

.hero__blob--1 {
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, var(--blue) 0%, transparent 70%);
  top: -160px;
  left: -120px;
}

.hero__blob--2 {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, var(--blue-deep) 0%, transparent 70%);
  top: -120px;
  right: -180px;
  opacity: 0.4;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(45, 140, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 140, 255, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 75%);
}

.hero__inner {
  position: relative;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--blue-deep);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow);
  margin-bottom: 26px;
}

.hero__title {
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--ink);
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  margin: 22px auto 0;
  max-width: 620px;
  font-size: clamp(15px, 3.4vw, 19px);
  color: var(--ink-soft);
}

.hero__actions {
  margin-top: 34px;
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__note {
  margin-top: 28px;
  font-size: 15px;
  color: var(--muted);
}

.hero__note b {
  color: var(--blue-deep);
}

/* ---------- 通用区块 ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 20px;
}

.section__head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section__title {
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 800;
  color: var(--ink);
}

.section__desc {
  margin-top: 14px;
  font-size: 16px;
  color: var(--muted);
}

/* ---------- 能力卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(45, 140, 255, 0.4);
}

.card__icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.card__icon--blue {
  background: linear-gradient(135deg, #e7f6ff, #d7e9ff);
  color: var(--blue-deep);
}

.card__icon--cyan {
  background: linear-gradient(135deg, #e3fbfb, #d9f0ff);
  color: #0fa9c9;
}

.card__title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}

.card__text {
  font-size: 15px;
  color: var(--muted);
}

/* ---------- 报名区 ---------- */
.section--signup {
  max-width: 900px;
}

.signup__cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  text-align: center;
  margin-bottom: 28px;
}

/* ---------- 报名区 · 邮箱审核模块 ---------- */
.signup__review {
  margin-top: 22px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.signup__review-title {
  font-size: 18px;
  color: var(--ink);
  margin: 0 0 10px;
}

.signup__review-desc {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0 0 16px;
}

.signup__review-mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
}

.signup__review-mail code {
  padding: 6px 12px;
  background: #eef3fb;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--blue-deep);
  font-size: 14px;
  font-weight: 600;
}

.signup__review-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

.signup__review-tip {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

.signup__review-tip code {
  padding: 1px 6px;
  background: #eef3fb;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--blue-deep);
  font-size: 12px;
}

.signup__review-mailto {
  color: var(--blue-deep);
  font-weight: 600;
  text-decoration: underline;
}

.signup__review-mailto:hover {
  color: var(--blue);
}

.signup__embed {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.signup__embed-tip {
  font-size: 15px;
  color: var(--ink-soft);
  text-align: center;
  margin-bottom: 14px;
}

.signup__embed-tip a {
  color: var(--blue-deep);
  font-weight: 600;
  text-decoration: underline;
}

.signup__iframe-wrap {
  position: relative;
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #f1f5fb;
  min-height: 200px;
}

.signup__iframe {
  display: block;
  width: 100%;
  border-radius: var(--radius-sm);
}

.signup__fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  padding: 24px;
  background: #f1f5fb;
  color: var(--ink-soft);
}

.signup__fallback p {
  margin: 0;
  font-size: 15px;
}

.signup__copy {
  margin-top: 18px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
  word-break: break-all;
}

.signup__copy code {
  display: inline-block;
  margin: 6px 0;
  padding: 6px 12px;
  background: #eef3fb;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink-soft);
  font-size: 13px;
}

.signup__copy-btn {
  margin-left: 8px;
  padding: 6px 14px;
  border: 1px solid var(--blue);
  background: #fff;
  color: var(--blue-deep);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.signup__copy-btn:hover {
  background: var(--grad);
  color: #fff;
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--ink);
  color: #c7d2e4;
  padding: 40px 20px;
}

.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
}

.footer__logo {
  font-size: 17px;
  color: #fff;
}

.footer__logo b {
  color: var(--blue);
}

.footer__note {
  margin-top: 8px;
  font-size: 14px;
  color: #93a3bd;
}

.footer__copy {
  margin-top: 14px;
  font-size: 13px;
  color: #6f7f99;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__toggle {
    display: flex;
    margin-left: auto;
  }

  .nav__mobile.is-open {
    display: flex;
  }

  .hero {
    padding: 64px 18px 76px;
  }

  .section {
    padding: 60px 18px;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .hide-mobile {
    display: none;
  }
}

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