/* ===== 设计令牌（对齐元衍 AI 设计语言） ===== */
:root {
  --color-primary:   #6c63ff;
  --color-primary-h: #5a52e0;
  --color-accent2:   #a78bfa;
  --color-bg:        #0f1117;
  --color-surface:   #1a1d27;
  --color-surface2:  #22263a;
  --color-border:    #2e3250;
  --color-text:      #e8eaf6;
  --color-muted:     #8b90b8;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-card: 0 4px 24px rgba(0,0,0,.5);

  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Segoe UI', sans-serif;
  --max-w: 1100px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: .9rem;
  font-weight: 500;
  transition: background .15s, opacity .15s, transform .1s;
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: var(--color-primary-h); }
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover { background: var(--color-surface); }
.btn--lg { padding: 13px 32px; font-size: 1rem; border-radius: var(--radius-md); }

/* ===== 导航 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 0 32px;
  height: 60px;
  background: rgba(15,15,19,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.navbar__logo { font-weight: 700; font-size: 1.1rem; color: #fff; flex-shrink: 0; }
.navbar__links { display: flex; gap: 24px; margin-right: auto; }
.navbar__links a { color: var(--color-muted); font-size: .9rem; transition: color .15s; }
.navbar__links a:hover { color: var(--color-text); }
.navbar__actions { display: flex; gap: 10px; }

/* ===== Hero ===== */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px 32px 80px;
  text-align: center;
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(135deg, #fff 40%, var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}
.hero__sub {
  color: var(--color-muted);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto 36px;
}

/* ===== 功能区 ===== */
.features {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 60px 32px;
}
.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: border-color .2s;
}
.feature-card:hover { border-color: var(--color-primary); }
.feature-card__icon { font-size: 2rem; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.feature-card p { color: var(--color-muted); font-size: .9rem; }

/* ===== 定价 ===== */
.pricing {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 60px 32px 100px;
  text-align: center;
}
.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 40px;
}
.pricing__grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  min-width: 240px;
  text-align: left;
  box-shadow: var(--shadow-card);
}
.pricing-card--highlight {
  border-color: var(--color-primary);
  background: linear-gradient(160deg, #1e1e30, #1a1a24);
}
.pricing-card__tier { font-size: .85rem; color: var(--color-muted); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 10px; }
.pricing-card__price { font-size: 2.4rem; font-weight: 800; margin-bottom: 24px; }
.pricing-card__price span { font-size: 1rem; font-weight: 400; color: var(--color-muted); }
.pricing-card__features { display: flex; flex-direction: column; gap: 10px; margin-bottom: 28px; }
.pricing-card__features li { font-size: .9rem; color: var(--color-muted); }
.pricing-card__features li:has(✓) { color: var(--color-text); }

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 100%;
  max-width: 400px;
  position: relative;
  box-shadow: var(--shadow-card);
}
.modal__close {
  position: absolute; top: 14px; right: 16px;
  background: none; border: none; cursor: pointer;
  color: var(--color-muted); font-size: 1.1rem;
}
.modal__tabs { display: flex; gap: 0; margin-bottom: 24px; border-bottom: 1px solid var(--color-border); }
.modal__tab {
  background: none; border: none; cursor: pointer;
  color: var(--color-muted); font-size: .95rem;
  padding: 8px 20px;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.modal__tab.active { color: var(--color-text); border-bottom-color: var(--color-primary); }

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: .85rem; color: var(--color-muted); margin-bottom: 6px; }
.form-group input {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--color-text);
  font-size: .95rem;
  transition: border-color .15s;
}
.form-group input:focus { outline: none; border-color: var(--color-primary); }
.form-submit { width: 100%; margin-top: 8px; }
.form-error { color: #f87171; font-size: .82rem; margin-top: 12px; min-height: 18px; }

/* ===== 弹窗 logo ===== */
.modal__logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.1rem; font-weight: 700;
  margin-bottom: 20px;
}

/* ===== Hero 新增 ===== */
.hero__badge {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(108,99,255,.4);
  background: rgba(108,99,255,.1);
  color: var(--color-accent2);
  font-size: .82rem;
  margin-bottom: 20px;
}
.hero__models {
  margin-top: 32px;
  display: flex; align-items: center; gap: 8px;
  flex-wrap: wrap; justify-content: center;
  color: var(--color-muted); font-size: .85rem;
}
.model-tag {
  padding: 3px 10px;
  border-radius: 6px;
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: .8rem;
}

/* ===== 定价新增 ===== */
.section-sub { color: var(--color-muted); font-size: .95rem; margin-top: -28px; margin-bottom: 40px; }
.pricing-card { position: relative; }
.pricing-card--highlight { position: relative; }
.pricing-card__badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff; font-size: .75rem; font-weight: 600;
  padding: 3px 14px; border-radius: 20px;
}
.pricing-card__features li.ok { color: var(--color-text); }
.pricing-card__features li.no { color: var(--color-muted); opacity: .5; }

/* ===== 下载区 ===== */
.download {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 60px 32px 100px;
  text-align: center;
}
.download__grid {
  display: flex; justify-content: center; gap: 20px; flex-wrap: wrap;
  margin-top: 40px;
}
.download-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  min-width: 200px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: border-color .2s;
}
.download-card:hover { border-color: var(--color-primary); }
.download-card--soon { opacity: .6; }
.download-card__icon { font-size: 2.4rem; margin-bottom: 12px; }
.download-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
.download-card p { color: var(--color-muted); font-size: .85rem; margin-bottom: 20px; }

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: .85rem;
  padding: 32px;
}
.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex; align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer__brand { display: flex; align-items: center; gap: 6px; font-weight: 600; color: var(--color-text); }
.footer__links { display: flex; gap: 20px; margin-left: auto; }
.footer__links a:hover { color: var(--color-text); }
.footer__copy { width: 100%; text-align: center; opacity: .5; font-size: .78rem; }

/* ===== 用户中心（dashboard）===== */
.dash-layout {
  display: flex; min-height: calc(100vh - 60px);
}
.dash-sidebar {
  width: 220px; flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 24px 12px;
  display: flex; flex-direction: column; gap: 4px;
}
.dash-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  color: var(--color-muted); font-size: .9rem;
  cursor: pointer; border: none; background: transparent; width: 100%; text-align: left;
  transition: all .15s;
}
.dash-nav-item:hover { background: var(--color-surface2); color: var(--color-text); }
.dash-nav-item.active { background: var(--color-surface2); color: var(--color-text); border-left: 2px solid var(--color-primary); }
.dash-main {
  flex: 1; padding: 36px 40px; overflow-y: auto;
}
.dash-section { display: none; }
.dash-section.active { display: block; }
.dash-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 24px; }
.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
}
.info-card__label { font-size: .8rem; color: var(--color-muted); margin-bottom: 6px; }
.info-card__value { font-size: 1rem; font-weight: 500; }
.plan-badge {
  display: inline-block; padding: 3px 12px;
  border-radius: 20px; font-size: .8rem; font-weight: 600;
}
.plan-badge--free { background: rgba(139,144,184,.15); color: var(--color-muted); }
.plan-badge--pro  { background: rgba(108,99,255,.2); color: var(--color-accent2); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-top: 8px; }
.stat-card {
  background: var(--color-surface2);
  border-radius: var(--radius-sm);
  padding: 18px;
}
.stat-card__num { font-size: 1.8rem; font-weight: 700; color: var(--color-primary); }
.stat-card__label { font-size: .8rem; color: var(--color-muted); margin-top: 4px; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .dash-sidebar { width: 60px; padding: 16px 8px; }
  .dash-nav-item span { display: none; }
  .dash-main { padding: 24px 16px; }
}
@media (max-width: 640px) {
  .navbar__links { display: none; }
  .hero { padding: 60px 20px 50px; }
  .features, .pricing, .download { padding-left: 20px; padding-right: 20px; }
  .footer__links { margin-left: 0; }
}