/* ===== 全局重置 & 主题 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', 'PingFang SC', Roboto, system-ui, -apple-system, sans-serif; }

:root {
    --primary: #FF6B35;
    --primary-dark: #e55a2b;
    --primary-light: #ff8a5c;
    --secondary: #2D4059;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --shadow: 0 8px 30px rgba(0,0,0,0.08);
    --radius: 20px;
    --radius-sm: 12px;
    --green: #2ecc71;
    --red: #e74c3c;
    --blue: #3498db;
    --gold: #f1c40f;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-light: #8a8aaa;
    --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

body {
    background: #e0e5ec;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
}

/* ===== 主布局: 手机 + 说明面板 ===== */
.layout {
    display: flex;
    gap: 32px;
    align-items: flex-start;
    max-width: 1200px;
    width: 100%;
    justify-content: center;
}

@media (max-width: 860px) {
    .layout { flex-direction: column; align-items: center; }
    .explain-panel { max-width: 390px; }
}

/* ===== 手机外壳 ===== */
.phone-frame {
    width: 390px;
    max-width: 100%;
    min-height: 780px;
    background: var(--bg);
    border-radius: 40px;
    box-shadow: 0 30px 80px rgba(0,0,0,0.25), inset 0 0 0 2px rgba(255,255,255,0.5);
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

/* 状态栏 */
.status-bar {
    padding: 12px 24px 4px;
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg);
    flex-shrink: 0;
    z-index: 10;
}
.status-bar .time { font-weight: 700; }
.status-icons { display: flex; gap: 6px; align-items: center; }
.status-icons i { font-size: 13px; }

/* 页面内容 */
.page-content {
    flex: 1;
    padding: 0 20px 20px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}
.page-content::-webkit-scrollbar { width: 0; }

/* 导航链接区域 */
.nav-links {
    display: flex;
    gap: 8px;
    padding: 8px 20px 14px;
    flex-wrap: wrap;
    border-top: 1px solid #e8ecf1;
    background: var(--bg);
    flex-shrink: 0;
}
.nav-link {
    flex: 1;
    padding: 8px 4px;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
    background: var(--card-bg);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}
.nav-link:hover { border-color: var(--primary); color: var(--primary); }
.nav-link.current { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 说明面板 ===== */
.explain-panel {
    background: #fff;
    border-radius: 16px;
    padding: 28px 24px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    position: sticky;
    top: 20px;
    min-width: 280px;
    max-width: 360px;
    flex-shrink: 0;
}
.explain-panel h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.explain-panel .page-type {
    display: inline-block;
    padding: 2px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    margin-bottom: 16px;
}
.explain-panel .section {
    margin-bottom: 16px;
}
.explain-panel .section h3 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.explain-panel .section p,
.explain-panel .section ul {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.8;
}
.explain-panel .section ul {
    padding-left: 18px;
}
.explain-panel .section ul li {
    margin-bottom: 4px;
}
.explain-panel .interactions {
    font-size: 11px;
    color: var(--text-light);
    padding-top: 12px;
    border-top: 1px solid #f0f2f5;
    margin-top: 4px;
}
.explain-panel .interactions strong {
    color: var(--text-secondary);
}

/* ===== 通用组件 ===== */
.page-header {
    display: flex;
    align-items: center;
    padding: 8px 0 16px;
    gap: 12px;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 5;
    padding-top: 4px;
}
.page-header .back-btn {
    width: 40px; height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    font-size: 18px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
    text-decoration: none;
}
.page-header .back-btn:active { transform: scale(0.92); }
.page-header h2 { font-size: 20px; font-weight: 700; color: var(--text-primary); flex: 1; }

.btn-primary {
    background: var(--primary); color: #fff; border: none;
    padding: 14px 32px; border-radius: 50px;
    font-size: 16px; font-weight: 700; cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 6px 20px rgba(255,107,53,0.35);
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%; text-decoration: none;
}
.btn-primary:active { transform: scale(0.96); }

.btn-secondary {
    background: var(--card-bg); color: var(--text-primary);
    border: 2px solid #e8ecf1; padding: 12px 24px; border-radius: 50px;
    font-size: 15px; font-weight: 600; cursor: pointer;
    transition: var(--transition);
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%; text-decoration: none;
}
.btn-secondary:active { transform: scale(0.96); }

/* 分类卡片 */
.category-card {
    background: var(--card-bg); border-radius: var(--radius);
    padding: 18px 20px 20px; margin-bottom: 16px;
    box-shadow: var(--shadow); transition: var(--transition);
}
.category-card:active { transform: scale(0.98); }
.category-card .cat-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.category-card .cat-icon {
    width: 40px; height: 40px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; color: #fff; flex-shrink: 0;
}
.cat-icon.orange { background: var(--primary); }
.cat-icon.blue { background: var(--blue); }
.cat-icon.green { background: var(--green); }
.category-card .cat-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.category-card .cat-sub { font-size: 12px; color: var(--text-light); }

/* 运动项目 */
.sport-items { display: flex; flex-direction: column; gap: 10px; }
.sport-item {
    display: flex; align-items: center;
    padding: 12px 16px; background: #f8f9fc;
    border-radius: var(--radius-sm); cursor: pointer;
    transition: var(--transition); border: 2px solid transparent;
    text-decoration: none; color: inherit;
}
.sport-item:active { transform: scale(0.97); background: #f0f2f7; }
.sport-item .item-icon {
    width: 36px; height: 36px; border-radius: 10px;
    background: var(--card-bg); display: flex;
    align-items: center; justify-content: center;
    font-size: 18px; margin-right: 14px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04); flex-shrink: 0;
}
.sport-item .item-info { flex: 1; }
.sport-item .item-name { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.sport-item .item-desc { font-size: 12px; color: var(--text-light); margin-top: 1px; }
.sport-item .item-arrow { color: var(--text-light); font-size: 14px; }

/* 时长选择器 */
.duration-selector {
    display: flex; gap: 8px; flex-wrap: wrap;
    margin-top: 12px; padding-top: 12px;
    border-top: 1px solid #f0f2f5;
}
.duration-selector .dur-btn {
    padding: 6px 14px; border-radius: 20px;
    border: 2px solid #e8ecf1; background: transparent;
    font-size: 13px; font-weight: 600; color: var(--text-secondary);
    cursor: pointer; transition: var(--transition);
    text-align: center; text-decoration: none;
}
.duration-selector .dur-btn:hover { border-color: var(--primary); }
.duration-selector .dur-btn.free { border-style: dashed; }

/* 介绍页 */
.intro-cover {
    width: 100%; height: 200px; border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; position: relative; overflow: hidden;
}
.intro-cover .emoji-big { font-size: 72px; opacity: 0.9; }
.intro-title { font-size: 24px; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.intro-tag {
    display: inline-block; background: #f0f2f5;
    padding: 2px 14px; border-radius: 20px;
    font-size: 12px; color: var(--text-secondary); margin-bottom: 16px;
}
.intro-desc {
    color: var(--text-secondary); line-height: 1.7; font-size: 14px;
    margin-bottom: 24px; padding: 16px 18px; background: #f8f9fc;
    border-radius: var(--radius-sm); border-left: 4px solid var(--primary);
}
.intro-actions { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }

/* 排行榜 */
.rank-tabs {
    display: flex; gap: 8px; margin-bottom: 16px;
    overflow-x: auto; padding-bottom: 4px;
}
.rank-tabs .tab-btn {
    padding: 8px 18px; border-radius: 20px; border: none;
    background: #f0f2f5; font-size: 13px; font-weight: 600;
    color: var(--text-secondary); cursor: pointer;
    transition: var(--transition); white-space: nowrap; flex-shrink: 0;
    text-decoration: none;
}
.rank-tabs .tab-btn:hover { background: var(--primary); color: #fff; }
.rank-tabs .tab-btn.active { background: var(--primary); color: #fff; }

.rank-list { display: flex; flex-direction: column; gap: 8px; }
.rank-item {
    display: flex; align-items: center; padding: 12px 16px;
    background: var(--card-bg); border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04); transition: var(--transition);
}
.rank-item .rank-num {
    width: 32px; font-size: 16px; font-weight: 800;
    color: var(--text-light); text-align: center; flex-shrink: 0;
}
.rank-item .rank-num.top1 { color: var(--gold); }
.rank-item .rank-num.top2 { color: #b0b0b0; }
.rank-item .rank-num.top3 { color: #cd7f32; }
.rank-item .rank-avatar {
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--primary-light); display: flex;
    align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 16px;
    margin: 0 14px; flex-shrink: 0;
}
.rank-item .rank-info { flex: 1; }
.rank-item .rank-name { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.rank-item .rank-detail { font-size: 12px; color: var(--text-light); }
.rank-item .rank-score { font-size: 18px; font-weight: 800; color: var(--primary); text-align: right; }
.rank-item .rank-score small { font-size: 12px; font-weight: 400; color: var(--text-light); }

.rank-my {
    margin-top: 16px; padding: 14px 18px;
    background: var(--card-bg); border-radius: var(--radius-sm);
    border: 2px solid var(--primary);
    display: flex; align-items: center; justify-content: space-between;
}
.rank-my .my-score { font-size: 20px; font-weight: 800; color: var(--primary); }

/* 运动页 */
.workout-top {
    display: flex; justify-content: space-between; align-items: center;
    padding: 4px 0 12px;
}
.workout-top .w-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.workout-top .w-title small { font-weight: 400; font-size: 13px; color: var(--text-light); }
.workout-top .w-status {
    padding: 4px 14px; border-radius: 20px;
    font-size: 12px; font-weight: 600; background: var(--green); color: #fff;
}

.workout-stats {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 12px; margin-bottom: 16px;
}
.stat-card {
    background: var(--card-bg); border-radius: var(--radius-sm);
    padding: 16px; text-align: center; box-shadow: var(--shadow);
}
.stat-card .stat-number { font-size: 32px; font-weight: 800; color: var(--text-primary); line-height: 1.2; }
.stat-card .stat-number .unit { font-size: 14px; font-weight: 600; color: var(--text-light); margin-left: 2px; }
.stat-card .stat-label { font-size: 12px; color: var(--text-light); margin-top: 2px; }
.stat-card .stat-number.primary { color: var(--primary); }
.stat-card .stat-number.green { color: var(--green); }

.camera-area {
    background: #1a1a2e; border-radius: var(--radius);
    overflow: hidden; position: relative;
    aspect-ratio: 16/9; margin-bottom: 16px; box-shadow: var(--shadow);
}
.camera-area .camera-placeholder {
    width: 100%; height: 100%; display: flex;
    align-items: center; justify-content: center; flex-direction: column;
    color: rgba(255,255,255,0.4); font-size: 14px; gap: 8px;
}
.camera-area .camera-placeholder i { font-size: 48px; opacity: 0.5; }
.camera-area .video-overlay {
    position: absolute; bottom: 12px; left: 12px;
    background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
    color: #fff; padding: 4px 12px; border-radius: 12px;
    font-size: 11px; display: flex; align-items: center; gap: 6px;
}
.camera-area .video-overlay .dot {
    width: 8px; height: 8px; border-radius: 50%; background: var(--red);
    animation: pulse-dot 1.2s infinite;
}
@keyframes pulse-dot {
    0%,100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.3; transform: scale(0.8); }
}

.pip {
    position: absolute; bottom: 12px; right: 12px;
    width: 80px; height: 60px; border-radius: 12px;
    background: #2d4059; border: 2px solid rgba(255,255,255,0.3);
    overflow: hidden; display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.3); font-size: 10px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}
.pip .pip-placeholder { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.pip .pip-placeholder i { font-size: 20px; }

.action-guide {
    background: var(--card-bg); border-radius: var(--radius-sm);
    padding: 16px; margin-bottom: 16px; box-shadow: var(--shadow);
    display: flex; align-items: center; gap: 16px;
}
.action-guide .guide-icon {
    font-size: 40px; width: 56px; height: 56px;
    border-radius: 16px; background: #f8f9fc;
    display: flex; align-items: center; justify-content: center;
}
.action-guide .guide-text .g-title { font-size: 15px; font-weight: 700; color: var(--text-primary); }
.action-guide .guide-text .g-desc { font-size: 13px; color: var(--text-secondary); }

.workout-controls { display: flex; gap: 12px; margin-top: 4px; }
.ctrl-btn {
    flex: 1; padding: 14px; border-radius: var(--radius-sm);
    border: none; font-size: 15px; font-weight: 700; cursor: pointer;
    transition: var(--transition); display: flex; align-items: center; justify-content: center; gap: 8px;
}
.ctrl-btn:active { transform: scale(0.94); }
.ctrl-btn.pause { background: #f0f2f5; color: var(--text-primary); }
.ctrl-btn.stop { background: #fee2e2; color: var(--red); }

/* 弹窗 */
.modal-overlay {
    background: rgba(0,0,0,0.5); backdrop-filter: blur(8px);
    display: flex; align-items: center; justify-content: center;
    padding: 24px; margin-top: 16px; border-radius: var(--radius);
}
.modal-box {
    background: var(--card-bg); border-radius: var(--radius);
    padding: 32px 24px 24px; max-width: 340px; width: 100%;
    text-align: center; box-shadow: 0 40px 80px rgba(0,0,0,0.3);
}
.modal-box .modal-icon { font-size: 56px; margin-bottom: 8px; }
.modal-box h3 { font-size: 22px; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.modal-box .modal-sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 20px; }
.modal-box .modal-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0 24px; }
.modal-box .modal-stat-item { background: #f8f9fc; border-radius: var(--radius-sm); padding: 12px; }
.modal-box .modal-stat-item .ms-number { font-size: 24px; font-weight: 800; color: var(--text-primary); }
.modal-box .modal-stat-item .ms-label { font-size: 12px; color: var(--text-light); }
.modal-box .modal-actions { display: flex; flex-direction: column; gap: 10px; }
.modal-box .modal-actions .btn-confirm {
    background: var(--primary); color: #fff; border: none;
    padding: 14px; border-radius: 50px; font-size: 16px; font-weight: 700;
    cursor: pointer; transition: var(--transition);
    box-shadow: 0 6px 20px rgba(255,107,53,0.3);
    text-decoration: none; display: block;
}
.modal-box .modal-actions .btn-cancel {
    background: transparent; border: none;
    color: var(--text-light); font-size: 14px; font-weight: 600;
    cursor: pointer; padding: 8px; text-decoration: none;
}

.stats-demo { margin-bottom: 16px; }

/* 响应式 */
@media (max-width: 420px) {
    body { padding: 0; }
    .phone-frame { width: 100%; min-height: 100vh; border-radius: 0; box-shadow: none; }
    .status-bar { padding: 8px 16px 2px; font-size: 11px; }
    .page-content { padding: 0 14px 14px; }
    .explain-panel { display: none; }
}