/* ============ 全局重置与变量 ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-bg-strong: rgba(255, 255, 255, 0.14);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    --glass-blur: blur(16px) saturate(180%);
    --glass-blur-light: blur(10px) saturate(150%);
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.15);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-dark: #1e293b;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', -apple-system, sans-serif;
    min-height: 100vh;
    color: var(--text);
    background: #0f172a;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============ 视频背景 ============ */
#video-background {
    position: fixed;
    right: 0; bottom: 0;
    min-width: 100%; min-height: 100%;
    width: auto; height: auto;
    z-index: -2;
    object-fit: cover;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,41,59,0.75) 50%, rgba(15,23,42,0.9) 100%);
}

/* ============ 顶部导航 ============ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 12px 20px;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 24px;
    color: var(--primary);
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-nav {
    display: flex;
    gap: 10px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    backdrop-filter: var(--glass-blur-light);
}

.nav-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: #fff;
    transform: translateY(-1px);
}

/* ============ 公告栏 ============ */
.announcement-bar {
    background: rgba(245, 158, 11, 0.15);
    border-bottom: 1px solid rgba(245, 158, 11, 0.3);
    padding: 8px 0;
}

.announcement-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: #fbbf24;
}

/* ============ 主容器 ============ */
.container {
    max-width: 1100px;
    margin: 24px auto;
    padding: 28px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
}

/* ============ 分类标签 ============ */
.category-section {
    margin-bottom: 24px;
}

.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.category-tab {
    padding: 8px 18px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    backdrop-filter: var(--glass-blur-light);
    white-space: nowrap;
}

.category-tab:hover {
    border-color: var(--primary);
    color: #fff;
    background: rgba(99,102,241,0.12);
}

.category-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}

.category-loader {
    width: 100%;
    height: 36px;
    background: var(--glass-bg);
    border-radius: 50px;
    animation: shimmer 1.5s infinite;
}

/* ============ 区块标题 ============ */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.section-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: #fff;
}

.section-badge {
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 50px;
    background: var(--primary-light);
    color: #a5b4fc;
    border: 1px solid rgba(99,102,241,0.3);
}

/* ============ 商品网格 ============ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 14px;
    margin-bottom: 24px;
}

.product-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-light);
    -webkit-backdrop-filter: var(--glass-blur-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 18px 14px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(139,92,246,0.05));
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover {
    border-color: rgba(99,102,241,0.5);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.3);
}

.product-card:hover::before { opacity: 1; }

.product-card.selected {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 0 0 2px rgba(99,102,241,0.3), 0 8px 25px rgba(99,102,241,0.2);
}

.product-card.selected .check-badge { display: flex; }

.check-badge {
    display: none;
    position: absolute;
    top: 8px; right: 8px;
    width: 24px; height: 24px;
    border-radius: 50%;
    background: var(--primary);
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 12px;
    font-weight: bold;
}

.product-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: #fff;
    line-height: 1.4;
    min-height: 2.6em;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

.product-stock {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.product-stock.low { color: var(--warning); }
.product-stock.out { color: var(--danger); }

.product-price {
    font-size: 1.15rem;
    font-weight: 700;
    color: #f87171;
}

.hot-badge {
    position: absolute;
    top: 8px; left: 8px;
    padding: 2px 8px;
    border-radius: 50px;
    background: linear-gradient(135deg, #f97316, #ef4444);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.product-card.empty {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

.product-card.empty:hover {
    transform: none;
    border-color: var(--glass-border);
}

/* ============ 商品介绍区域 ============ */
.intro-section {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-light);
    -webkit-backdrop-filter: var(--glass-blur-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease;
}

.intro-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #a5b4fc;
}

.intro-content {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.7;
    word-break: break-word;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ 购买配置 ============ */
.purchase-config {
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-bottom: 20px;
}

.config-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 12px;
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xs);
    background: var(--glass-bg);
    color: #fff;
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.form-group input::placeholder { color: rgba(148,163,184,0.5); }

/* 数量控制 */
.quantity-control {
    display: flex;
    align-items: center;
    gap: 0;
}

.quantity-control input {
    width: 60px;
    text-align: center;
    border-radius: 0;
    -moz-appearance: textfield;
}

.quantity-control input::-webkit-outer-spin-button,
.quantity-control input::-webkit-inner-spin-button { -webkit-appearance: none; }

.qty-btn {
    width: 36px; height: 40px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: #fff;
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.qty-btn:first-child { border-radius: var(--radius-xs) 0 0 var(--radius-xs); }
.qty-btn:last-child { border-radius: 0 var(--radius-xs) var(--radius-xs) 0; }

.qty-btn:hover { background: var(--primary-light); border-color: var(--primary); }

/* 优惠券 */
.coupon-input-wrap { position: relative; }

.coupon-status {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 50px;
}

.coupon-status.valid { background: rgba(16,185,129,0.2); color: #34d399; }
.coupon-status.invalid { background: rgba(239,68,68,0.2); color: #f87171; }

/* ============ 支付方式 ============ */
.payment-methods {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.payment-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.payment-card:hover {
    border-color: rgba(99,102,241,0.4);
    background: var(--glass-bg-strong);
}

.payment-card.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}

.payment-card img {
    width: 32px; height: 32px;
    object-fit: contain;
}

.payment-card span { font-size: 0.85rem; color: var(--text-muted); }
.payment-card.selected span { color: #fff; font-weight: 600; }

.check-mark {
    position: absolute;
    top: 8px; right: 10px;
    width: 20px; height: 20px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
    display: none;
    align-items: center;
    justify-content: center;
}

.payment-card.selected .check-mark { display: flex; }

/* ============ 价格展示 ============ */
.price-display {
    text-align: center;
    padding: 20px;
    margin-bottom: 16px;
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    backdrop-filter: var(--glass-blur-light);
}

.price-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.price-label {
    font-size: 1rem;
    color: var(--text-muted);
}

.price-value {
    font-size: 2.2rem;
    font-weight: 800;
    color: #f87171;
    font-family: 'SF Mono', 'Consolas', monospace;
}

.price-symbol {
    font-size: 1.2rem;
    font-weight: 600;
    vertical-align: super;
}

.price-detail {
    font-size: 0.8rem;
    color: #34d399;
    margin-top: 6px;
    min-height: 1.2em;
}

/* ============ 按钮 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-xs);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: #fff;
    padding: 14px;
    font-size: 1.05rem;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 20px rgba(99,102,241,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99,102,241,0.5);
}

.btn-primary:active { transform: translateY(0); }

.btn-outline {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text);
    flex: 1;
}

.btn-outline:hover {
    background: var(--glass-bg-strong);
    border-color: #fff;
}

/* ============ 模态框 ============ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-glass {
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 480px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.5);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--glass-border);
}

.modal-header h2 {
    font-size: 1.1rem;
    color: #fff;
}

.modal-close {
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px; height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover { background: rgba(255,255,255,0.1); color: #fff; }

.modal-body { padding: 24px; }

.order-summary {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    font-size: 0.9rem;
}

.summary-row span:first-child { color: var(--text-muted); }
.summary-row span:last-child { color: #fff; }

.discount-row span:last-child { color: #34d399; }

.total-row {
    border-top: 1px solid var(--glass-border);
    border-bottom: none;
    padding-top: 14px;
    margin-top: 6px;
    font-size: 1.1rem;
    font-weight: 700;
}

.total-row span:last-child {
    color: #f87171;
    font-size: 1.3rem;
}

.modal-footer {
    display: flex;
    gap: 10px;
    padding: 16px 24px 20px;
    border-top: 1px solid var(--glass-border);
}

.modal-footer .btn { flex: 1; }

/* ============ Toast ============ */
.toast-container {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    color: #fff;
    backdrop-filter: var(--glass-blur);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    font-size: 0.9rem;
    animation: toastIn 0.3s ease, toastOut 0.4s ease 2.5s forwards;
    pointer-events: all;
    border: 1px solid var(--glass-border);
}

.toast.success { background: rgba(16,185,129,0.85); }
.toast.error { background: rgba(239,68,68,0.85); }
.toast.warning { background: rgba(245,158,11,0.85); }
.toast.info { background: rgba(59,130,246,0.85); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; }
    to { opacity: 0; transform: translateY(-10px); }
}

/* ============ 加载动画 ============ */
.loader {
    display: none;
    width: 36px; height: 36px;
    border: 3px solid rgba(255,255,255,0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 20px auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

@keyframes shimmer {
    0% { opacity: 0.5; }
    50% { opacity: 0.8; }
    100% { opacity: 0.5; }
}

/* ============ 跑马灯颜色效果 ============ */
#color {
    display: inline-block;
    font-weight: 700;
    transition: color 0.3s ease;
}

/* ============ 响应式 ============ */
@media (max-width: 768px) {
    .container { margin: 12px; padding: 16px; border-radius: var(--radius-sm); }
    .product-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 10px; }
    .config-row { grid-template-columns: 1fr; }
    .payment-methods { grid-template-columns: 1fr 1fr; }
    .site-header { padding: 10px 12px; }
    .logo-text { font-size: 1.1rem; }
    .price-value { font-size: 1.8rem; }
    .modal-glass { margin: 10px; }
}

@media (max-width: 480px) {
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .container { padding: 12px; }
    .purchase-config { padding: 14px; }
}