:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 480px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    padding: 32px;
}

.card-header {
    text-align: center;
    margin-bottom: 28px;
}

.card-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.card-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
    outline: none;
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    color: #fff;
}

.btn-primary {
    background: var(--primary);
}
.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-danger {
    background: var(--danger);
}
.btn-danger:hover {
    background: #b91c1c;
}

.btn-success {
    background: var(--success);
}
.btn-success:hover {
    background: #15803d;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.info-box {
    background: #f1f5f9;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}
.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.info-value {
    font-weight: 600;
    font-size: 0.95rem;
}

.info-value.highlight {
    color: var(--primary);
    font-size: 1.1rem;
}

.choice-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
}

.choice-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    cursor: pointer;
}

.choice-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.choice-card .icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.choice-card .title {
    font-weight: 600;
    margin-bottom: 4px;
}

.choice-card .desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.875rem;
    display: none;
}

.alert-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.result-box {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
}

.result-box .big-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 8px;
}

.result-box .sub-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 管理后台 */
.admin-container {
    max-width: 900px;
    width: 100%;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.admin-table th, .admin-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.admin-table th {
    background: #f8fafc;
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-pending { background: #fef3c7; color: var(--warning); }
.badge-approved { background: #dbeafe; color: #2563eb; }
.badge-completed { background: #dcfce7; color: var(--success); }
.badge-rejected { background: #fef2f2; color: var(--danger); }

.btn-sm {
    padding: 4px 10px;
    font-size: 0.75rem;
    width: auto;
    margin-right: 4px;
}