/* R62 银龄乐学 · 适老化 H5 #FF6B35 */
:root {
  --color-primary: #FF6B35;
  --color-primary-dark: #E55A2B;
  --color-accent: #FFA726;
  --color-bg: #FFFAF5;
  --color-card-bg: #FFFFFF;
  --color-text: #2D2D2D;
  --color-text-light: #757575;
  --color-success: #4CAF50;
  --color-warning: #FF9800;
  --color-danger: #EF5350;
  --font-size-base: 18px;
  --font-size-sm: 14px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --touch-min: 44px;
  --touch-gap: 8px;
  --radius-card: 16px;
  --radius-btn: 12px;
  --anim-duration: 400ms;
  --input-height: 56px;
  --shadow-sm: 0 2px 12px rgba(0,0,0,.08);
  --shadow-md: 0 8px 24px rgba(0,0,0,.1);
}
html[data-senior="true"] {
  --font-size-base: 22px;
  --font-size-sm: 16px;
  --font-size-lg: 24px;
  --font-size-xl: 28px;
  --font-size-2xl: 36px;
  --touch-min: 48px;
  --touch-gap: 12px;
  --anim-duration: 600ms;
  --input-height: 60px;
  --color-text-light: #555555;
}
body.senior-contrast { --color-text: #1a1a1a; }
.senior-toggle.is-active, .voice-assist.is-speaking {
  background: var(--color-primary); color: #fff; border-color: var(--color-primary);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: 'PingFang SC', 'Helvetica Neue', sans-serif;
  font-size: var(--font-size-base); color: var(--color-text);
  background: var(--color-bg); line-height: 1.65;
  padding-top: calc(3.5rem + env(safe-area-inset-top));
  padding-bottom: calc(5.5rem + env(safe-area-inset-bottom));
}
.container { max-width: 960px; margin: 0 auto; padding: 0 1rem; }
.glass-card {
  background: color-mix(in srgb, var(--color-card-bg) 92%, var(--color-bg));
  border: 1px solid color-mix(in srgb, var(--color-primary) 25%, transparent);
  border-radius: var(--radius-card); box-shadow: var(--shadow-sm);
}
.section { padding: 2.5rem 0; }
.section-title { font-size: var(--font-size-xl); margin: 0 0 .35rem; font-weight: 800; }
.section-desc { color: var(--color-text-light); margin: 0 0 1.25rem; font-size: var(--font-size-sm); }

.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  background: transparent; transition: background var(--anim-duration);
}
.navbar.is-solid {
  background: color-mix(in srgb, var(--color-bg) 94%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 20%, transparent);
}
.nav-inner { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; padding: .5rem 0; position: relative; }
.nav-logo { font-weight: 800; color: var(--color-primary); text-decoration: none; font-size: var(--font-size-lg); }
.nav-links { display: flex; gap: .75rem; flex: 1; flex-wrap: wrap; }
.nav-links a { color: var(--color-text); text-decoration: none; font-size: var(--font-size-sm); min-height: var(--touch-min); display: flex; align-items: center; }
.senior-toggle, .theme-toggle {
  min-height: var(--touch-min); min-width: var(--touch-min); border-radius: var(--radius-btn);
  border: 2px solid color-mix(in srgb, var(--color-primary) 35%, transparent);
  background: var(--color-card-bg); cursor: pointer; font-family: inherit; font-size: var(--font-size-sm);
}
.theme-panel { position: absolute; top: 100%; right: 0; padding: .75rem; display: flex; flex-wrap: wrap; gap: .35rem; max-width: 280px; z-index: 10; }
.theme-panel[hidden] { display: none !important; }
.scheme-chip {
  border: 2px solid transparent; border-radius: 999px; padding: .35rem .65rem;
  background: var(--color-card-bg); cursor: pointer; font-size: var(--font-size-sm);
}
.scheme-chip::before { content: ''; display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--dot); margin-right: .35rem; }
.scheme-chip.active { border-color: var(--color-primary); font-weight: 700; }

.hero {
  position: relative; min-height: 72vh; display: flex; align-items: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  margin-top: calc(-3.5rem - env(safe-area-inset-top)); padding-top: calc(3.5rem + env(safe-area-inset-top));
}
.hero-overlay { position: absolute; inset: 0; background: rgba(0,0,0,.12); }
.hero-content { position: relative; z-index: 1; color: #fff; text-align: center; padding: 2rem 0; }
.hero-eyebrow { opacity: .9; font-size: var(--font-size-sm); margin: 0 0 .5rem; }
.hero-title { font-size: clamp(1.75rem, 6vw, var(--font-size-2xl)); margin: 0 0 .5rem; line-height: 1.2; }
.hero-subtitle { font-size: var(--font-size-lg); opacity: .95; margin: 0 0 1.5rem; }
.hero-cta { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--touch-min); padding: .65rem 1.25rem; border-radius: var(--radius-btn);
  border: 2px solid transparent; font-family: inherit; font-size: var(--font-size-base);
  cursor: pointer; text-decoration: none; transition: transform .15s, box-shadow var(--anim-duration);
}
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,.8); }
.btn-lg { min-height: calc(var(--touch-min) + 4px); padding: .75rem 1.5rem; font-size: var(--font-size-lg); }
.btn-sm { min-height: var(--touch-min); font-size: var(--font-size-sm); padding: .4rem .85rem; }
.btn-block { width: 100%; }
.btn-pulse { animation: btn-pulse 2s ease-in-out infinite; }
@keyframes btn-pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(255,255,255,.4); } 50% { box-shadow: 0 0 0 12px rgba(255,255,255,0); } }
.courses .btn-outline { color: var(--color-primary); border-color: var(--color-primary); background: var(--color-card-bg); }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; text-align: center; }
.stat-number { display: block; font-size: clamp(1.75rem, 5vw, 2.5rem); font-weight: 800; color: var(--color-primary); line-height: 1.1; }
.stat-label { font-size: var(--font-size-sm); color: var(--color-text-light); }
@media (max-width: 640px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

.filter-bar { padding: 1rem; margin-bottom: 1rem; }
.filter-group { margin-bottom: .75rem; }
.filter-label { display: block; font-size: var(--font-size-sm); color: var(--color-text-light); margin-bottom: .35rem; }
.filter-tags { display: flex; flex-wrap: wrap; gap: var(--touch-gap); }
.filter-tag {
  min-height: var(--touch-min); min-width: var(--touch-min); padding: .45rem .9rem;
  border-radius: 999px; border: 2px solid #E0E0E0; background: var(--color-card-bg);
  font-size: var(--font-size-sm); cursor: pointer; font-family: inherit;
}
.filter-tag.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.filter-count { font-size: var(--font-size-sm); color: var(--color-primary); font-weight: 700; }

.course-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
@media (max-width: 640px) { .course-grid { grid-template-columns: 1fr; } }
.course-card {
  background: var(--color-card-bg); border-radius: var(--radius-card); overflow: hidden;
  box-shadow: var(--shadow-sm); cursor: pointer; transition: transform var(--anim-duration), box-shadow var(--anim-duration);
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.course-cover { width: 100%; aspect-ratio: 16/10; object-fit: cover; display: block; }
.course-body { padding: 1rem; }
.course-header { display: flex; justify-content: space-between; align-items: flex-start; gap: .5rem; margin-bottom: .35rem; }
.course-name { margin: 0; font-size: var(--font-size-lg); }
.course-teacher, .course-meta { font-size: var(--font-size-sm); color: var(--color-text-light); margin: .25rem 0; }
.course-meta { display: flex; flex-direction: column; gap: .15rem; }
.course-bottom { display: flex; justify-content: space-between; align-items: center; margin-top: .75rem; gap: .5rem; }
.course-price { font-size: var(--font-size-xl); color: var(--color-primary); font-weight: 800; }
.course-price small { font-size: var(--font-size-sm); font-weight: 400; }
.course-status { font-size: .72rem; padding: .2rem .55rem; border-radius: 999px; white-space: nowrap; flex-shrink: 0; }
.course-status.open { background: #E8F5E9; color: var(--color-success); }
.course-status.limited { background: #FFF3E0; color: var(--color-warning); }
.course-status.full { background: #FFEBEE; color: var(--color-danger); }

.teacher-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 768px) { .teacher-grid { grid-template-columns: repeat(2, 1fr); } }
.teacher-card { padding: 1rem; text-align: center; background: var(--color-card-bg); border-radius: var(--radius-card); box-shadow: var(--shadow-sm); }
.teacher-avatar {
  width: 100px; height: 100px; border-radius: 50%; margin: 0 auto .65rem;
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 2rem; font-weight: 800;
}
.teacher-card h3 { margin: 0 0 .25rem; font-size: var(--font-size-lg); }
.teacher-title { font-size: var(--font-size-sm); color: var(--color-primary); margin: 0 0 .35rem; }
.teacher-intro { font-size: var(--font-size-sm); color: var(--color-text-light); margin: 0 0 .75rem; min-height: 3em; }

.work-filter { display: flex; flex-wrap: wrap; gap: var(--touch-gap); margin-bottom: 1rem; }
.work-grid { columns: 2; column-gap: 1rem; }
@media (min-width: 640px) { .work-grid { columns: 3; } }
.work-card { break-inside: avoid; margin-bottom: 1rem; cursor: pointer; border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-sm); background: var(--color-card-bg); }
.work-card img { width: 100%; display: block; }
.work-card figcaption { padding: .65rem; font-size: var(--font-size-sm); }
.work-card figcaption strong { display: block; margin-bottom: .15rem; }
.work-card figcaption span { color: var(--color-text-light); }

.trial-card { padding: 1.5rem; text-align: center; }
.trial-form { display: flex; gap: .75rem; flex-wrap: wrap; justify-content: center; margin-top: 1rem; }
.trial-form .input-lg { flex: 1; min-width: 200px; max-width: 320px; }

.faq-item { border-bottom: 1px solid #EEE; }
.faq-q {
  width: 100%; text-align: left; background: none; border: none; padding: 1rem 0;
  font-family: inherit; font-size: var(--font-size-lg); font-weight: 600; cursor: pointer;
  min-height: var(--touch-min); display: flex; justify-content: space-between; align-items: center;
}
.faq-a { max-height: 0; overflow: hidden; transition: max-height var(--anim-duration); }
.faq-item.is-open .faq-a { max-height: 200px; }
.faq-a p { margin: 0 0 1rem; color: var(--color-text-light); }

.org-footer { background: color-mix(in srgb, var(--color-primary) 8%, var(--color-bg)); }
.org-footer__grid { display: grid; gap: 1.5rem; }
@media (min-width: 640px) { .org-footer__grid { grid-template-columns: 1fr auto; align-items: center; } }
.org-footer h3 { margin: 0 0 .5rem; }
.org-footer p { margin: .25rem 0; font-size: var(--font-size-sm); }
.qr-placeholder {
  width: 120px; height: 120px; border: 2px dashed var(--color-primary); border-radius: 8px;
  display: flex; align-items: center; justify-content: center; color: var(--color-text-light); margin: 0 auto .35rem;
}

.input-lg {
  height: var(--input-height); font-size: var(--font-size-lg); border-radius: var(--radius-btn);
  border: 2px solid #E0E0E0; padding: 0 1rem; width: 100%; font-family: inherit;
}
.input-lg:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent); }
.enroll-form label { display: block; margin: .75rem 0 .35rem; font-weight: 600; }
.enroll-form-actions { display: flex; gap: .75rem; margin-top: 1rem; }
.enroll-form-actions .btn-primary { flex: 1; }

.modal { position: fixed; inset: 0; z-index: 950; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.modal[hidden] { display: none !important; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.5); }
.modal__box { position: relative; width: 100%; max-width: 420px; max-height: 90vh; overflow-y: auto; padding: 1.25rem; }
.modal__box--wide { max-width: 520px; }
.modal__close { position: absolute; top: .5rem; right: .75rem; border: none; background: none; font-size: 1.5rem; cursor: pointer; min-width: var(--touch-min); min-height: var(--touch-min); }

.enroll-steps { display: flex; justify-content: space-between; margin-bottom: 1.5rem; gap: .25rem; }
.enroll-steps .step { flex: 1; text-align: center; font-size: var(--font-size-sm); color: var(--color-text-light); position: relative; }
.enroll-steps .step span {
  display: inline-flex; width: 32px; height: 32px; align-items: center; justify-content: center;
  border-radius: 50%; background: #E0E0E0; color: #fff; margin-bottom: .35rem;
}
.enroll-steps .step.active span { background: var(--color-primary); }
.enroll-steps .step.done span { background: var(--color-success); }

.pay-methods { display: grid; gap: .5rem; margin: 1rem 0; }
.pay-option {
  display: flex; align-items: center; gap: .5rem; padding: .75rem; border: 2px solid #E0E0E0;
  border-radius: var(--radius-btn); cursor: pointer; min-height: var(--touch-min);
}
.pay-option.active { border-color: var(--color-primary); background: color-mix(in srgb, var(--color-primary) 8%, #fff); }
.enroll-success { text-align: center; padding: 1rem 0; }
.success-icon { font-size: 3rem; margin-bottom: .5rem; }

.detail-cover { width: 100%; border-radius: var(--radius-card); margin-bottom: 1rem; }
.detail-main h2 { margin: .35rem 0; }
.detail-teacher, .detail-intro { color: var(--color-text-light); font-size: var(--font-size-sm); }
.detail-meta { list-style: none; padding: 0; margin: 1rem 0; font-size: var(--font-size-sm); }
.detail-meta li { margin: .25rem 0; }
.detail-tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: 1rem; }
.tag-chip { font-size: var(--font-size-sm); padding: .2rem .55rem; border-radius: 999px; background: color-mix(in srgb, var(--color-primary) 12%, #fff); }
.detail-sub { margin: 1rem 0 .5rem; }
.accordion-item {
  width: 100%; text-align: left; padding: .85rem; border: none; border-bottom: 1px solid #EEE;
  background: var(--color-card-bg); font-family: inherit; font-size: var(--font-size-base);
  min-height: var(--touch-min); display: flex; justify-content: space-between; cursor: pointer;
}
.accordion-panel { max-height: 0; overflow: hidden; transition: max-height var(--anim-duration); padding: 0 .85rem; }
.accordion-panel.is-open { max-height: 120px; padding-bottom: .85rem; }
.detail-enroll-bar {
  position: sticky; bottom: 0; display: flex; justify-content: space-between; align-items: center;
  gap: 1rem; padding-top: 1rem; margin-top: 1rem; border-top: 1px solid #EEE; background: var(--color-card-bg);
}

.lightbox { position: fixed; inset: 0; z-index: 960; background: rgba(0,0,0,.85); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 1rem; }
.lightbox[hidden] { display: none !important; }
.lightbox img { max-width: 92%; max-height: 70vh; border-radius: var(--radius-card); }
.lightbox-close { position: absolute; top: 1rem; right: 1rem; background: none; border: none; color: #fff; font-size: 2rem; cursor: pointer; }
#lightboxCaption { color: #fff; margin-top: .75rem; text-align: center; }

.fade-in { opacity: 0; transform: translateY(16px); transition: opacity var(--anim-duration), transform var(--anim-duration); }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }

.senior-toast {
  position: fixed; bottom: calc(6rem + env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%) translateY(20px);
  background: rgba(45,45,45,.92); color: #fff; padding: .65rem 1.1rem; border-radius: 999px;
  font-size: var(--font-size-sm); z-index: 999; opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s;
}
.senior-toast--show { opacity: 1; transform: translateX(-50%) translateY(0); }

.contact-footer {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 800;
  background: var(--color-card-bg); border-top: 1px solid #EEE; padding: .5rem .75rem calc(.5rem + env(safe-area-inset-bottom));
}
.contact-footer__btns { display: flex; gap: .5rem; margin-bottom: .35rem; }
.contact-footer__cta, .contact-footer__btn {
  flex: 1; text-align: center; padding: .55rem; border-radius: var(--radius-btn);
  text-decoration: none; font-size: var(--font-size-sm); min-height: var(--touch-min); display: flex; align-items: center; justify-content: center;
}
.contact-footer__cta { background: var(--color-primary); color: #fff; font-weight: 700; }
.contact-footer__btn { background: #F5F5F5; color: var(--color-text); border: none; cursor: pointer; font-family: inherit; }
.contact-footer__brand { margin: 0; text-align: center; font-size: .62rem; color: var(--color-text-light); }

.share-page { padding: 2rem 1rem; min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.share-card { max-width: 420px; width: 100%; padding: 1.5rem; text-align: center; }

/* ── P1 ── */
.week-campus-filter { display: flex; flex-wrap: wrap; gap: var(--touch-gap); margin-bottom: .75rem; }
.course-actions { display: flex; gap: .35rem; align-items: center; }
.course-actions .btn-share { color: var(--color-primary); border-color: var(--color-primary); background: var(--color-card-bg); padding: .35rem .55rem; font-size: .72rem; min-height: var(--touch-min); }
  display: flex; gap: .75rem; overflow-x: auto; scroll-snap-type: x mandatory;
  padding: .5rem 0 1rem; -webkit-overflow-scrolling: touch;
}
.week-col {
  flex: 0 0 200px; scroll-snap-align: center; background: var(--color-card-bg);
  border-radius: var(--radius-card); padding: .75rem; box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
}
.week-col.is-today { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.week-col__head { font-weight: 800; color: var(--color-primary); margin-bottom: .5rem; font-size: var(--font-size-sm); text-align: center; }
.week-slot {
  width: 100%; text-align: left; border: 1px solid #EEE; border-radius: var(--radius-btn);
  padding: .55rem; margin-bottom: .45rem; background: var(--color-bg); cursor: pointer;
  font-family: inherit; min-height: var(--touch-min);
}
.week-slot strong { display: block; font-size: var(--font-size-sm); margin: .15rem 0; }
.week-slot__time { font-size: .72rem; color: var(--color-primary); font-weight: 700; }
.week-slot__meta { font-size: .68rem; color: var(--color-text-light); }
.week-empty { font-size: var(--font-size-sm); color: var(--color-text-light); text-align: center; margin: .5rem 0; }

.share-canvas-wrap {
  position: fixed; inset: 0; z-index: 970; background: rgba(0,0,0,.55);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 1rem; overflow-y: auto;
}
.share-canvas-wrap[hidden] { display: none !important; }
.share-canvas-wrap .btn { max-width: 360px; width: 100%; }

/* ── P2 ── */
.voice-assist {
  min-height: var(--touch-min); min-width: var(--touch-min); border-radius: var(--radius-btn);
  border: 2px solid color-mix(in srgb, var(--color-primary) 35%, transparent);
  background: var(--color-card-bg); cursor: pointer; font-size: 1rem;
}
.recommend-form { padding: 1rem; margin-bottom: 1rem; }
.recommend-form label { display: block; margin: .5rem 0 .25rem; font-weight: 600; }
.recommend-results { display: grid; gap: .75rem; }
@media (min-width: 640px) { .recommend-results { grid-template-columns: repeat(3, 1fr); } }
.recommend-card { padding: 1rem; }
.recommend-rank { font-size: .68rem; color: var(--color-primary); font-weight: 700; }
.recommend-card h3 { margin: .25rem 0; font-size: var(--font-size-lg); }
.recommend-reason { font-size: var(--font-size-sm); color: var(--color-text-light); }

.campus-wrap { padding: 1rem; overflow: hidden; }
.campus-scene { width: 100%; height: 280px; border-radius: var(--radius-card); background: #e8f4fc; }
.campus-controls { display: flex; align-items: center; gap: .75rem; margin-top: .75rem; flex-wrap: wrap; }
.campus-tip { font-size: var(--font-size-sm); color: var(--color-text-light); }

.dash-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; margin-bottom: 1.25rem; }
@media (max-width: 640px) { .dash-grid { grid-template-columns: 1fr; } }
.dash-card { padding: 1rem; text-align: center; }
.dash-card strong { display: block; font-size: var(--font-size-xl); color: var(--color-primary); }
.dash-label { font-size: .68rem; color: var(--color-text-light); }
.dash-sub { margin: 1rem 0 .5rem; font-size: var(--font-size-lg); }
.dash-bar-row { display: grid; grid-template-columns: 6rem 1fr 3rem; align-items: center; gap: .5rem; margin-bottom: .5rem; font-size: var(--font-size-sm); }
.dash-bar-track { height: 10px; background: #EEE; border-radius: 999px; overflow: hidden; }
.dash-bar-fill { height: 100%; background: var(--color-primary); border-radius: 999px; transition: width .6s ease; }
.dash-top { list-style: none; padding: 0; margin: 0; }
.dash-top li { display: flex; align-items: center; gap: .65rem; padding: .55rem 0; border-bottom: 1px solid #EEE; font-size: var(--font-size-sm); }
.dash-top li span { width: 1.5rem; height: 1.5rem; border-radius: 50%; background: var(--color-primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: .72rem; flex-shrink: 0; }
.dash-top em { margin-left: auto; color: var(--color-text-light); font-style: normal; }

.detail-enroll-bar { flex-wrap: wrap; gap: .75rem; }
.detail-actions { display: flex; gap: .35rem; width: 100%; }
.detail-price-row { flex: 1; min-width: 120px; }
.detail-price-row strong { font-size: var(--font-size-xl); color: var(--color-primary); }