@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Noto+Sans+TC:wght@400;500;700&display=swap');

:root {
    --ink: #1e293b;
    --ink-soft: #64748b;
    --ink-light: #94a3b8;
    --paper: #f8fafc;
    --panel: #ffffff;
    --line: #e2e8f0;
    --primary: #4f46e5;
    --primary-deep: #4338ca;
    --primary-wash: #eef2ff;
    --teal: #0d9488;
    --teal-wash: #ccfbf1;
    --amber: #d97706;
    --amber-wash: #fef3c7;
    --coral: #e11d48;
    --coral-wash: #ffe4e6;
    --green: #16a34a;
    --green-wash: #dcfce7;
    --sidebar-bg: #0f172a;
    --sidebar-text: #e2e8f0;
    --sidebar-hover: #1e293b;
    --sidebar-active: #312e81;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
    font-family: 'Plus Jakarta Sans', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--ink);
    background-color: var(--paper);
}

body { min-width: 320px; }

#blazor-error-ui {
    display: none;
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 2000;
    padding: 0.75rem 1rem;
    color: #881337;
    background: #ffe4e6;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

#blazor-error-ui .reload {
    margin-left: 0.5rem;
    color: var(--coral);
    font-weight: 700;
}

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.5; }

/* Admin Shell Layout */
.admin-shell {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.brand-lockup {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-mark {
    width: 2.25rem;
    height: 2.25rem;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    color: white;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.15rem;
}

.brand-title {
    display: flex;
    flex-direction: column;
}

.brand-title strong {
    font-size: 0.95rem;
    font-weight: 700;
    color: #ffffff;
}

.brand-title small {
    font-size: 0.75rem;
    color: var(--ink-light);
}

.admin-nav {
    display: flex;
    flex-direction: column;
    padding: 1rem 0.75rem;
    gap: 0.35rem;
    flex: 1;
}

.admin-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: #cbd5e1;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.15s ease-in-out;
}

.admin-nav a:hover {
    background: var(--sidebar-hover);
    color: #ffffff;
}

.admin-nav a.active {
    background: var(--primary);
    color: #ffffff;
    font-weight: 600;
}

.sidebar-footer {
    padding: 1.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.admin-role {
    display: inline-block;
    align-self: flex-start;
    padding: 0.15rem 0.5rem;
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
    border-radius: 0.25rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.admin-email {
    font-size: 0.825rem;
    color: #94a3b8;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.admin-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow-x: hidden;
}

.admin-topbar {
    height: 3.75rem;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}

.eyebrow {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
}

.session-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.75rem;
    background: var(--green-wash);
    color: var(--green);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.session-chip::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--green);
    border-radius: 50%;
}

.admin-content {
    padding: 2rem;
    flex: 1;
}

/* Page Headings */
.page-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.75rem;
    gap: 1.5rem;
}

.page-heading h1 {
    margin: 0.25rem 0 0.5rem;
    font-size: 1.85rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--ink);
}

.page-lede {
    margin: 0;
    color: var(--ink-soft);
    font-size: 0.95rem;
}

.heading-stat {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    background: var(--panel);
    padding: 0.75rem 1.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--line);
}

.heading-stat strong {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.heading-stat span {
    font-size: 0.75rem;
    color: var(--ink-soft);
}

/* Stats KPI Cards Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--panel);
    padding: 1.25rem 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-card-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ink-soft);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-card-value {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--ink);
}

.stat-card-sub {
    font-size: 0.8rem;
    color: var(--ink-light);
}

/* Panels */
.panel {
    background: var(--panel);
    border-radius: 0.75rem;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--line);
}

.panel-header h2, .panel-header h3 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
}

.panel-caption {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.muted-note {
    font-size: 0.8rem;
    color: var(--ink-soft);
    font-weight: 400;
}

/* Filter bar */
.filter-bar {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    background: var(--panel);
    padding: 1.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--line);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex: 1;
    min-width: 180px;
}

.filter-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ink-soft);
}

/* Form inputs & buttons */
.field-input, .field-select, .field-textarea {
    width: 100%;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--line);
    border-radius: 0.5rem;
    background: var(--panel);
    color: var(--ink);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.15s ease;
}

.field-input:focus, .field-select:focus, .field-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.primary-button {
    background: var(--primary);
    color: #ffffff;
    border: none;
    padding: 0.65rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.15s ease;
}

.primary-button:hover:not(:disabled) {
    background: var(--primary-deep);
}

.secondary-button {
    background: var(--paper);
    color: var(--ink);
    border: 1px solid var(--line);
    padding: 0.65rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.15s ease;
}

.secondary-button:hover:not(:disabled) {
    background: #e2e8f0;
}

.danger-button {
    background: var(--coral);
    color: #ffffff;
    border: none;
    padding: 0.65rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: opacity 0.15s ease;
}

.danger-button:hover:not(:disabled) {
    opacity: 0.9;
}

.link-button {
    background: none;
    border: none;
    color: var(--primary);
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
}

.link-button:hover {
    text-decoration: underline;
}

.danger-link {
    color: var(--coral);
}

/* Tables */
.table-scroll {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

.data-table th {
    padding: 0.75rem 1rem;
    background: #f1f5f9;
    color: var(--ink-soft);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--line);
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--line);
    vertical-align: middle;
}

.data-table tr:hover td {
    background-color: #f8fafc;
}

.cell-primary {
    font-weight: 600;
    color: var(--ink);
    display: block;
}

.cell-secondary {
    font-size: 0.8rem;
    color: var(--ink-soft);
    display: block;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.55rem;
    border-radius: 0.35rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-paid, .badge-active, .badge-enabled, .badge-success {
    background: var(--green-wash);
    color: var(--green);
}

.badge-pending, .badge-warning {
    background: var(--amber-wash);
    color: var(--amber);
}

.badge-refunded, .badge-failed, .badge-disabled, .badge-danger {
    background: var(--coral-wash);
    color: var(--coral);
}

.badge-info, .badge-primary {
    background: var(--primary-wash);
    color: var(--primary);
}

.badge-course {
    background: #ede9fe;
    color: #6d28d9;
    margin-right: 0.25rem;
}

/* Alert notifications */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-error {
    background: var(--coral-wash);
    color: #881337;
    border: 1px solid #fecdd3;
}

.alert-success {
    background: var(--green-wash);
    color: #14532d;
    border: 1px solid #bbf7d0;
}

.alert-info {
    background: var(--primary-wash);
    color: #1e1b4b;
    border: 1px solid #c7d2fe;
}

/* Loading & Empty states */
.empty-state, .admin-loading {
    padding: 3rem 1.5rem;
    text-align: center;
    color: var(--ink-soft);
    font-size: 0.95rem;
}

/* Detail page layout */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

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

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f1f5f9;
}

.detail-label {
    color: var(--ink-soft);
    font-weight: 500;
}

.detail-value {
    font-weight: 600;
    color: var(--ink);
}

/* Login screen */
.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 50% 30%, #eef2ff, #f8fafc);
    padding: 2rem;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--panel);
    border-radius: 1rem;
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--line);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-brand-mark {
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: #ffffff;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 800;
    margin: 0 auto 1rem;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.login-header h2 {
    margin: 0 0 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
}

.login-header p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink);
}

.pagination-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
}