:root {
    --bg-gradient: radial-gradient(circle at top left, #1d4ed8, #1e3a8a 35%, #0f172a 80%);
    --glass-bg: rgba(15, 23, 42, 0.45);
    --card-bg: rgba(15, 23, 42, 0.72);
    --light-card-bg: rgba(255, 255, 255, 0.06);
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --primary: #60a5fa;
    --primary-strong: #2563eb;
    --primary-soft: rgba(96, 165, 250, 0.2);
    --secondary: #f97316;
    --danger: #f87171;
    --warning: #facc15;
    --success: #34d399;
    --text: #f8fafc;
    --muted: #94a3b8;
    --shadow: 0 30px 60px -15px rgba(15, 23, 42, 0.65);
    --radius-large: 24px;
    --radius-medium: 18px;
    --radius-small: 12px;
    --blur: blur(18px);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Manrope', 'Segoe UI', Helvetica, Arial, sans-serif;
    background: #020617;
    color: var(--text);
    position: relative;
    line-height: 1.6;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: var(--bg-gradient);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    backdrop-filter: blur(110px);
    z-index: -1;
    opacity: 0.35;
}

.container {
    width: min(1080px, 92vw);
    margin: 0 auto;
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border: 1px solid var(--border);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 0.85rem 0;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.35);
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    text-decoration: none;
    color: var(--text);
}

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(145deg, var(--primary), var(--primary-strong));
    display: grid;
    place-items: center;
    font-weight: 700;
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.brand-title {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.brand-sub {
    font-size: 0.75rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.nav-link {
    color: var(--muted);
    text-decoration: none;
    font-weight: 600;
    padding: 0.4rem 0.75rem;
    border-radius: 999px;
    transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover {
    color: var(--text);
    background: rgba(96, 165, 250, 0.12);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-lg { padding: 0.85rem 1.8rem; font-size: 1.05rem; }
.btn-sm { padding: 0.55rem 1rem; font-size: 0.92rem; }

.btn-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #0f172a;
    box-shadow: 0 18px 40px -12px rgba(37, 99, 235, 0.55);
}

.btn-gradient:hover { transform: translateY(-2px); }

.btn-outline {
    background: rgba(96, 165, 250, 0.12);
    border-color: rgba(96, 165, 250, 0.4);
    color: var(--text);
}

.btn-outline:hover { background: rgba(96, 165, 250, 0.2); }

.btn-ghost {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.14);
    color: var(--text);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.08);
}

.site-main {
    padding: 2.5rem 0 4rem;
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
}

.card {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-large);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 2.4rem;
    align-items: center;
}

.hero-copy h1 {
    font-size: clamp(2.35rem, 5vw, 3.1rem);
    margin: 0.6rem 0 1rem;
    line-height: 1.2;
}

.hero-copy p {
    color: rgba(248, 250, 252, 0.82);
    font-size: 1.03rem;
    margin-bottom: 1.3rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.3rem;
}

.hero-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.hero-side .product-card {
    background: var(--light-card-bg);
    border-radius: var(--radius-large);
    padding: 1.8rem;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.product-card h3 {
    margin: 0 0 0.6rem;
    font-size: 1.35rem;
}

.product-price {
    margin: 0 0 1.3rem;
    font-size: 1rem;
    color: var(--muted);
}

.product-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    margin-bottom: 1.4rem;
}

.meta-label {
    display: block;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(148, 163, 184, 0.76);
}

.meta-value {
    font-size: 1.1rem;
    font-weight: 700;
}

.meta-value.highlight { color: var(--secondary); }

.qr-box {
    display: grid;
    place-items: center;
    border-radius: var(--radius-medium);
    border: 1px dashed rgba(96, 165, 250, 0.35);
    background: rgba(96, 165, 250, 0.08);
    padding: 1.2rem;
    min-height: 220px;
}

.qr-box img {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-small);
    object-fit: contain;
    background: rgba(15, 23, 42, 0.9);
    padding: 0.6rem;
    border: 1px solid rgba(96, 165, 250, 0.18);
}

.qr-placeholder {
    color: var(--muted);
    text-align: center;
}

.product-note {
    margin-top: 1.1rem;
    color: rgba(203, 213, 225, 0.78);
    font-size: 0.9rem;
}

.badge {
    display: inline-flex;
    padding: 0.35rem 0.9rem;
    border-radius: 999px;
    background: rgba(96, 165, 250, 0.2);
    border: 1px solid rgba(96, 165, 250, 0.35);
    color: var(--primary);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.2rem;
}

.stat-card {
    background: var(--light-card-bg);
    border-radius: var(--radius-medium);
    padding: 1.4rem;
    border: 1px solid transparent;
    transition: border 0.2s ease;
}

.stat-card:hover { border-color: rgba(96, 165, 250, 0.3); }

.stat-label { font-size: 0.8rem; color: var(--muted); letter-spacing: 0.12em; text-transform: uppercase; }
.stat-value { display: block; font-size: 1.7rem; font-weight: 700; margin: 0.5rem 0; }
.stat-value.highlight { color: var(--secondary); }
.stat-desc { color: rgba(203, 213, 225, 0.78); font-size: 0.9rem; }

.timeline {
    display: grid;
    gap: 1.5rem;
}

.timeline-item {
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 1.2rem;
    align-items: start;
}

.timeline-index {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.32), rgba(37, 99, 235, 0.5));
    display: grid;
    place-items: center;
    font-weight: 700;
}

.timeline-item h3 { margin: 0 0 0.4rem; }
.timeline-item p { margin: 0; color: rgba(203, 213, 225, 0.75); }

.section-head {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.4rem;
}

.announcements .announcement-list {
    display: grid;
    gap: 1.2rem;
}

.announcement-item {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(96, 165, 250, 0.12);
    border-radius: var(--radius-medium);
    padding: 1.3rem;
}

.announcement-item h3 { margin: 0 0 0.4rem; }
.announcement-item p { margin: 0 0 0.8rem; color: rgba(203, 213, 225, 0.85); }
.announcement-meta { font-size: 0.82rem; color: var(--muted); }

.form-card .intro { color: rgba(203, 213, 225, 0.82); margin-bottom: 1.2rem; }

.form-grid {
    display: grid;
    gap: 1.1rem;
}

label { display: flex; flex-direction: column; gap: 0.6rem; font-weight: 600; }

input[type="text"],
input[type="number"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-small);
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: rgba(15, 23, 42, 0.78);
    color: var(--text);
    font-size: 1rem;
    transition: border 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: rgba(96, 165, 250, 0.6);
    box-shadow: 0 0 0 1px rgba(96, 165, 250, 0.35);
}

textarea { resize: vertical; min-height: 120px; }

.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-medium);
    border: 1px solid rgba(148, 163, 184, 0.15);
}

.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 640px;
    font-size: 0.95rem;
}

.table th,
.table td {
    padding: 0.9rem 1rem;
    text-align: left;
}

.table th {
    background: rgba(148, 163, 184, 0.1);
    color: rgba(226, 232, 240, 0.9);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.78rem;
}

.table-striped tbody tr:nth-child(odd) {
    background: rgba(15, 23, 42, 0.6);
}

.table-striped tbody tr:hover {
    background: rgba(96, 165, 250, 0.1);
}

.alert {
    padding: 0.9rem 1.1rem;
    border-radius: var(--radius-small);
    font-weight: 600;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.alert-error {
    background: rgba(248, 113, 113, 0.16);
    border: 1px solid rgba(248, 113, 113, 0.35);
    color: #fecaca;
}

.alert-success {
    background: rgba(52, 211, 153, 0.16);
    border: 1px solid rgba(52, 211, 153, 0.35);
    color: #bbf7d0;
}

.group-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.2rem;
}

.group-card {
    background: var(--light-card-bg);
    border-radius: var(--radius-medium);
    padding: 1.4rem;
    border: 1px solid rgba(96, 165, 250, 0.18);
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.group-card header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.group-leader { font-weight: 700; font-size: 1.05rem; }
.status-tag {
    font-size: 0.78rem;
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    background: rgba(96, 165, 250, 0.18);
    border: 1px solid rgba(96, 165, 250, 0.3);
}

.group-price { margin: 0; font-weight: 600; }
.group-timer { margin: 0; color: var(--muted); }

.empty-state {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius-medium);
    background: rgba(15, 23, 42, 0.55);
    border: 1px dashed rgba(148, 163, 184, 0.3);
    display: grid;
    gap: 1rem;
}

.site-footer {
    margin: 0;
    padding: 2.8rem 0;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.6rem;
    align-items: start;
}

.footer-links { display: grid; gap: 0.4rem; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); }
.footer-meta { color: rgba(148, 163, 184, 0.7); font-size: 0.9rem; }

/* Group detail */
.status-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid rgba(148, 163, 184, 0.25);
}

.status-chip-paid {
    background: rgba(34, 197, 94, 0.18);
    border-color: rgba(34, 197, 94, 0.4);
    color: #bbf7d0;
}

.status-chip-pending {
    background: rgba(248, 113, 113, 0.18);
    border-color: rgba(248, 113, 113, 0.35);
    color: #fecdd3;
}

.status-chip-review {
    background: rgba(96, 165, 250, 0.18);
    border-color: rgba(96, 165, 250, 0.4);
    color: #dbeafe;
}

.status-chip-shipped {
    background: rgba(14, 165, 233, 0.2);
    border-color: rgba(14, 165, 233, 0.45);
    color: #bae6fd;
}

.group-status-line {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    align-items: center;
    margin: 0 0 1.2rem;
    color: rgba(226, 232, 240, 0.85);
}

.group-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 2rem;
}

.group-summary h1 { margin: 0.5rem 0 1rem; font-size: clamp(2rem, 4vw, 2.6rem); }
.group-summary p { color: rgba(226, 232, 240, 0.85); margin-bottom: 1.2rem; }

.progress {
    height: 10px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.15);
    overflow: hidden;
    margin-bottom: 1.4rem;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 999px;
}

.group-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.4rem;
}

.meta-value.status-open { color: var(--primary); }
.meta-value.status-completed { color: var(--success); }
.meta-value.status-expired { color: var(--warning); }

.callout {
    padding: 1.2rem 1.4rem;
    border-radius: var(--radius-medium);
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.callout.success { border-color: rgba(52, 211, 153, 0.45); background: rgba(34, 197, 94, 0.12); }
.callout.warning { border-color: rgba(250, 204, 21, 0.45); background: rgba(250, 204, 21, 0.12); }

.group-share {
    display: grid;
    gap: 1rem;
    background: rgba(15, 23, 42, 0.55);
    border-radius: var(--radius-large);
    padding: 1.8rem;
    border: 1px solid rgba(96, 165, 250, 0.2);
}

.share-box {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.8rem;
}

.share-box input {
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(96, 165, 250, 0.25);
    font-family: 'Manrope', monospace;
    font-size: 0.92rem;
}

.share-tip { font-size: 0.9rem; color: var(--muted); }

/* Admin area */
body.admin {
    background: #0f172a;
    color: #e2e8f0;
}

body.admin::before,
body.admin::after {
    display: none;
}

.admin-header,
.admin-footer {
    background: rgba(15, 23, 42, 0.9);
    padding: 1.2rem 0;
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

.admin-header h1 { margin: 0; font-size: 1.35rem; }
.admin-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.admin-greeting { margin: 0; color: rgba(203, 213, 225, 0.75); font-size: 0.95rem; }

.admin-header nav {
    margin-top: 0.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.admin-header nav a {
    color: #cbd5f5;
    text-decoration: none;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    border: 1px solid transparent;
}

.admin-header nav a:hover {
    background: rgba(96, 165, 250, 0.12);
    border-color: rgba(96, 165, 250, 0.2);
}

.admin-header nav a.logout { color: #fca5a5; }

.admin .card {
    background: rgba(15, 23, 42, 0.85);
    border-color: rgba(148, 163, 184, 0.18);
}

.admin .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.admin .metric { font-size: 2.4rem; margin: 0; }

.auth-container { max-width: 380px; }
.auth-card { background: rgba(15, 23, 42, 0.9); border: 1px solid rgba(148, 163, 184, 0.2); }

.actions {
    display: flex;
    gap: 0.6rem;
}
.actions form { margin: 0; }
.btn-text, .btn-link { background: none; color: var(--primary); border: none; padding: 0; }
.btn-link { text-decoration: underline; }
.btn-link:hover { color: var(--secondary); }

.inline-form {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: flex-end;
    margin-bottom: 1.2rem;
}

.inline-form label { flex: 1 1 240px; }

.qr-preview img {
    width: 160px;
    height: 160px;
    border-radius: var(--radius-small);
    object-fit: contain;
    border: 1px solid rgba(148, 163, 184, 0.2);
    padding: 0.6rem;
    background: rgba(15, 23, 42, 0.85);
}

.alert + .card { margin-top: 1rem; }

@media (max-width: 900px) {
    .hero,
    .group-hero {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .nav-bar { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .nav-links { flex-wrap: wrap; justify-content: flex-start; gap: 0.4rem; width: 100%; }
    .site-main { padding-top: 1.5rem; }
    .card { padding: 1.6rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .timeline-item { grid-template-columns: 40px 1fr; }
    .share-box { grid-template-columns: 1fr; }
}
    .site-main { padding-top: 1.5rem; }
    .card { padding: 1.6rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .timeline-item { grid-template-columns: 40px 1fr; }
    .share-box { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
    .brand-title { font-size: 1rem; }
    .brand-mark { width: 40px; height: 40px; font-size: 0.9rem; }
    .hero-copy h1 { font-size: 2.1rem; }
    .group-meta { grid-template-columns: 1fr; }
}

/* 活动状态样式 */
.activity-status {
    text-align: center;
    padding: 2rem;
}

.activity-message h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.activity-message p {
    font-size: 1.1rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

.activity-timer {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--primary-soft);
    border: 1px solid var(--primary);
    border-radius: var(--radius-small);
    text-align: center;
}

.activity-timer p {
    margin: 0 0 1rem 0;
    color: var(--primary);
    font-weight: 600;
}

.activity-timer .countdown {
    margin: 0;
}

/* 倒计时样式 */
.countdown {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
}

.countdown-item {
    text-align: center;
    background: var(--glass-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-medium);
    padding: 1.5rem 1rem;
    backdrop-filter: var(--blur);
}

.countdown-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.countdown-label {
    display: block;
    font-size: 0.9rem;
    color: var(--muted);
    margin-top: 0.5rem;
}

/* 商品选择样式 */
.product-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.product-item {
    padding: 1rem;
    background: var(--light-card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-small);
    cursor: pointer;
    transition: all 0.3s ease;
}

.product-item:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
}

.product-item.selected {
    border-color: var(--primary);
    background: var(--primary-soft);
    box-shadow: 0 0 0 2px var(--primary-soft);
}

.product-item h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text);
    font-size: 1.1rem;
}

.product-price {
    margin: 0 0 0.5rem 0;
    color: var(--primary);
    font-weight: 600;
    font-size: 1.2rem;
}

.product-desc {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

/* 商品管理样式 */
.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-head h2 {
    margin: 0;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-small);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-success {
    background: var(--success);
    color: #0f172a;
}

.badge-secondary {
    background: var(--muted);
    color: var(--text);
}

.badge-danger {
    background: var(--danger);
    color: #0f172a;
}

.image-preview {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--light-card-bg);
    border-radius: var(--radius-small);
    border: 1px solid var(--border);
}

.image-preview img {
    border-radius: var(--radius-small);
    box-shadow: var(--shadow);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn-danger {
    background: var(--danger);
    color: #0f172a;
    border: 1px solid var(--danger);
}

.btn-danger:hover {
    background: #dc2626;
    border-color: #dc2626;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .countdown {
        gap: 1rem;
    }
    
    .countdown-item {
        padding: 1rem 0.5rem;
    }
    
    .countdown-value {
        font-size: 2rem;
    }
    
    .section-head {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .form-actions {
        flex-direction: column;
    }
}