/* assets/css/components.css */

/* ===== 导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition-normal);
}
.site-header.scrolled { background: rgba(248, 250, 252, 0.98); box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.header-logo { display: flex; align-items: baseline; gap: 8px; }
.logo-text { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; color: var(--color-primary); letter-spacing: 2px; }
.logo-sub { font-size: 0.75rem; color: var(--color-text-muted); }
.header-nav { display: flex; align-items: center; gap: 2rem; }
.nav-link { font-size: 0.9375rem; font-weight: 500; color: var(--color-text-secondary); position: relative; padding: 4px 0; }
.nav-link::after { content: ''; position: absolute; bottom: -2px; left: 50%; width: 0; height: 2px; background: var(--color-primary); transition: width var(--transition-normal), left var(--transition-normal); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; left: 0; }
.nav-link:hover, .nav-link.active { color: var(--color-primary); }
.nav-cta { margin-left: 0.5rem; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text-primary); border-radius: 2px; transition: var(--transition-fast); }

/* 桌面/平板默认隐藏抽屉元素（>=768px 不可见、不可聚焦） */
.drawer-header { display: none; }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0.75rem 2rem; border-radius: var(--radius-full); font-family: var(--font-heading); font-size: 0.9375rem; font-weight: 500; cursor: pointer; border: none; transition: all var(--transition-fast); text-align: center; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; transform: scale(1.02); }
.btn-outline { background: transparent; border: 1.5px solid var(--color-primary); color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
/* 白色描边按钮 — 用于深色背景上的二级 CTA */
.btn-white { background: transparent; border: 1.5px solid rgba(255, 255, 255, 0.7); color: #fff; }
.btn-white:hover { background: rgba(255, 255, 255, 0.15); border-color: #fff; color: #fff; transform: scale(1.02); }
.btn-accent { background: var(--color-accent); color: #fff; }
.btn-accent:hover { background: #ea580c; color: #fff; transform: scale(1.02); }
.btn-lg { padding: 1rem 2.5rem; font-size: 1.0625rem; }

/* ===== 卡片 ===== */
.card { background: var(--color-white); border: 1px solid var(--color-divider); border-radius: var(--radius-md); overflow: hidden; transition: transform var(--transition-normal), box-shadow var(--transition-normal); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.card-image { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.card-body { padding: 1.5rem; }
.card-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--color-text-primary); }
.card-text { color: var(--color-text-muted); font-size: 0.9375rem; line-height: 1.6; }
.card-tag { display: inline-block; padding: 0.25rem 0.75rem; border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 500; background: var(--color-primary-ghost); color: var(--color-primary); }

/* ===== 标签/Pill ===== */
.tag { display: inline-block; padding: 0.375rem 1rem; border-radius: var(--radius-full); font-size: 0.8125rem; font-weight: 500; border: 1px solid var(--color-divider); color: var(--color-text-muted); cursor: pointer; transition: all var(--transition-fast); }
.tag:hover, .tag.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ===== 表单 ===== */
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; margin-bottom: 0.375rem; font-size: 0.875rem; font-weight: 500; color: var(--color-text-secondary); }
.form-input, .form-textarea {
  width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: var(--font-body); font-size: 1rem; color: var(--color-text-primary); background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input:focus, .form-textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-ghost); }
.form-textarea { min-height: 120px; resize: vertical; }

/* ===== Footer ===== */
.site-footer { background: var(--color-text-primary); color: rgba(255,255,255,0.7); padding: var(--space-section) 0 2rem; }
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 1rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 3rem; }
.footer-col { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-col a { color: rgba(255,255,255,0.6); font-size: 0.9375rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.8125rem; }
.footer-bottom a { color: rgba(255,255,255,0.5); }

/* ===== 共享页面组件 ===== */
.page-hero {
  padding: 8rem 0 3rem; text-align: center;
  background: linear-gradient(to bottom, var(--color-bg-card), var(--color-bg-page));
}
.page-hero h1 { margin-bottom: 0.5rem; }
.page-hero p { color: var(--color-text-muted); }

.section-eyebrow { font-size: var(--text-eyebrow); letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-text-muted); margin-bottom: 0.5rem; }
.section-title { margin-bottom: 0.5rem; }
.section-subtitle { color: var(--color-text-muted); margin-bottom: 3rem; }

/* ═══════════════════════════════════════════════════════════
   移动端导航：右侧全高深色抽屉 (<= 767px)
   层级体系（均位于 site-header 层叠上下文内）:
     scrim z-index:5（覆盖 header 区域）
     drawer z-index:6（高于 scrim）
     menuToggle 打开态 visibility:hidden（绝无第二关闭按钮）
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 767px) {
  /* Header 高度收紧 */
  .header-inner { height: 64px; }

  /* ── 导航抽屉：关闭态完全隐藏（不可见、不可交互、不可聚焦）── */
  .header-nav {
    position: fixed;
    top: 0; right: 0;
    width: min(86vw, 360px);
    height: 100dvh;
    background: #0F172A;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    gap: 0;
    padding: 0;
    transform: translateX(100%);
    visibility: hidden;
    pointer-events: none;
    transition: transform 240ms var(--ease-out-expo), visibility 0ms 240ms;
    z-index: 6;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.35);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .header-nav.open {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
    transition: transform 240ms var(--ease-out-expo), visibility 0ms 0ms;
  }

  /* ── 抽屉头部：品牌名 + 唯一关闭按钮 ── */
  .drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
  }
  .drawer-brand {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: 0;
  }
  .drawer-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px; height: 44px;
    padding: 0;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    flex-shrink: 0;
  }
  .drawer-close:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
  }
  .drawer-close:focus-visible {
    outline: 2px solid var(--color-accent-400);
    outline-offset: 2px;
  }

  /* ── 导航链接：纵向排列，52px 触控高度 ── */
  .header-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.0625rem;
    font-weight: var(--fw-medium);
    padding: 0 24px;
    min-height: 52px;
    width: 100%;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: background var(--transition-fast), color var(--transition-fast);
    flex-shrink: 0;
  }
  .header-nav .nav-link::after { display: none; }
  .header-nav .nav-link:hover,
  .header-nav .nav-link:active {
    color: #fff;
    background: rgba(255, 255, 255, 0.06);
  }
  .header-nav .nav-link.active {
    color: var(--color-accent-400);
    background: rgba(249, 115, 22, 0.08);
    border-left: 3px solid var(--color-accent);
    font-weight: var(--fw-semibold);
  }

  /* ── CTA 按钮 ── */
  .header-nav .nav-cta {
    margin: 1.5rem 24px;
    width: calc(100% - 48px);
    justify-content: center;
    min-height: 48px;
  }

  /* ── 汉堡菜单按钮 ── */
  .menu-toggle { display: flex; }
  /* 打开态：完全隐藏汉堡，不产生第二个 X/关闭按钮 */
  .menu-toggle.open {
    visibility: hidden;
    pointer-events: none;
  }
  .menu-toggle.open span { background: #fff; }

  /* ── 导航遮罩层：覆盖全视口包括 header ── */
  .nav-scrim {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 5;
    opacity: 0;
    transition: opacity 240ms var(--ease-out-expo);
    pointer-events: none;
  }
  .nav-scrim.open {
    display: block;
    opacity: 1;
    pointer-events: auto;
  }

  @media (prefers-reduced-motion: reduce) {
    .header-nav, .nav-scrim { transition: none; }
  }
}

/* ── 手机端全屏导航 (<=430px) ── */
@media (max-width: 430px) {
  .header-nav {
    width: 100vw;
    max-width: 100vw;
    left: 0;
    right: auto;
    transform: translateX(100%);
    box-shadow: none;
  }
  .header-nav.open {
    transform: translateX(0);
  }
  /* 全屏菜单下关闭按钮更突出 */
  .drawer-close {
    width: 44px; height: 44px;
  }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
}