/* 手机 / 平板响应式 + 移动端导航 */

:root {
  --header-h: 56px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

body {
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  padding-bottom: var(--safe-bottom);
}

.header {
  padding-top: var(--safe-top);
}

.container,
.header-inner {
  padding-left: max(16px, var(--safe-left));
  padding-right: max(16px, var(--safe-right));
}

/* ── 汉堡菜单按钮（默认隐藏） ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  margin-left: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  background: var(--surface);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 1px;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

body.nav-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
body.nav-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
body.nav-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(15, 23, 42, 0.45);
  border: none;
  padding: 0;
  cursor: pointer;
}

body.nav-open .nav-backdrop {
  display: block;
}

body.nav-open {
  overflow: hidden;
}

/* ── 平板及以下：抽屉导航 ── */
@media (min-width: 961px) {
  .nav-toggle,
  .nav-backdrop {
    display: none !important;
  }
}

@media (max-width: 960px) {
  .header-inner {
    height: var(--header-h);
    flex-wrap: nowrap;
    position: relative;
    gap: 8px;
  }

  .logo {
    flex: 1;
    min-width: 0;
    font-size: 14px;
  }

  .logo-text {
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: fixed;
    top: calc(var(--header-h) + var(--safe-top));
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 101;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 16px calc(24px + var(--safe-bottom));
    background: var(--surface);
    border-top: 1px solid var(--border);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  body.nav-open .nav {
    display: flex;
  }

  .nav a,
  .nav button.link {
    display: block;
    padding: 14px 16px;
    font-size: 15px;
    border-radius: var(--radius-btn);
    border-bottom: none;
  }

  #auth-area {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin: 12px 0 0;
    padding-top: 12px;
    border-top: 1px solid var(--border);
  }

  #auth-area .btn {
    width: 100%;
    justify-content: center;
  }

  .page-layout,
  .profile-page,
  .plan-page-layout {
    padding-top: 8px;
  }

  .form-row,
  .form-row-2col {
    grid-template-columns: 1fr;
  }

  .code-input-row {
    flex-direction: column;
  }

  .code-input-row .btn {
    width: 100%;
    min-height: var(--btn-height);
  }

  .hero {
    padding: 32px 0 28px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero-title {
    font-size: clamp(26px, 7vw, 36px);
  }

  .hero-desc {
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .home-process-five {
    grid-template-columns: 1fr;
  }

  .home-mentor-flow-steps {
    grid-template-columns: 1fr;
  }

  .profile-step-nav {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    margin-left: -4px;
    margin-right: -4px;
  }

  .profile-step-item {
    flex-shrink: 0;
  }

  .profile-page-header,
  .page-header {
    text-align: left;
  }

  .page-header .page-desc {
    font-size: 14px;
  }

  .modal {
    width: calc(100vw - 32px);
    max-width: 420px;
    padding: 24px 20px;
    margin: 16px;
  }

  .pay-modal .pay-qr-wrap img {
    max-width: 100%;
    height: auto;
  }

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

  .admin-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .admin-toolbar .btn,
  .admin-toolbar select {
    width: 100%;
  }

  .page-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-actions .btn {
    width: 100%;
  }

  .plan-risk-head {
    flex-direction: column;
  }

  .plan-risk-actions {
    width: 100%;
  }

  .plan-risk-actions .btn {
    flex: 1;
    min-width: 0;
  }

  /* 表格横向滚动 */
  .table-wrap {
    margin-left: -4px;
    margin-right: -4px;
    border-radius: 12px;
  }

  table {
    font-size: 13px;
  }

  th,
  td {
    padding: 10px 8px;
  }

  .college-cell-td {
    min-width: 140px;
  }

  /* 悬浮助手：全宽底栏式 */
  .ai-ip-root {
    right: 12px;
    bottom: calc(12px + var(--safe-bottom));
    left: auto;
  }

  .ai-ip-panel {
    position: fixed;
    right: 12px;
    left: 12px;
    bottom: calc(72px + var(--safe-bottom));
    width: auto;
    max-width: none;
    height: min(70vh, 520px);
  }

  .ai-ip-fab-label {
    font-size: 11px;
  }

  .global-status-banner {
    font-size: 12px;
    padding: 8px 12px;
    line-height: 1.45;
  }

  .site-footer-inner {
    padding: 0 8px;
    font-size: 12px;
  }
}

/* ── 小屏手机 ── */
@media (max-width: 480px) {
  .container,
  .header-inner {
    padding-left: max(12px, var(--safe-left));
    padding-right: max(12px, var(--safe-right));
  }

  .hero-stats,
  .home-data-band-metrics,
  .home-trust-inner,
  .admin-stats {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .hero-title {
    font-size: 26px;
  }

  .btn-lg {
    min-height: 48px;
    font-size: 16px;
  }

  .card {
    padding: 18px 16px;
  }

  .home-scenario-carousel {
    padding: 0 8px 24px;
  }

  .pref-chip-grid {
    gap: 6px;
  }

  .mentor-card {
    padding: 16px;
  }
}

/* ── 横屏手机：略减垂直占用 ── */
@media (max-width: 960px) and (orientation: landscape) {
  .ai-ip-panel {
    height: min(85vh, 420px);
  }

  .nav {
    padding-bottom: 16px;
  }
}