/* ClassSync Admin Dashboard — Dedicated Admin Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
    --color-bg-deep: #0a0a0f;
    --color-bg-surface: #111118;
    --color-bg-card: rgba(255,255,255,0.03);
    --color-bg-hover: rgba(255,255,255,0.06);
    --color-border: rgba(255,255,255,0.07);
    --color-border-accent: rgba(139,92,246,0.3);

    --color-primary: #7c3aed;
    --color-primary-light: #a78bfa;
    --color-secondary: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #4b5563;

    --gradient-primary: linear-gradient(135deg, #7c3aed, #4f46e5);
    --gradient-surface: linear-gradient(145deg, rgba(139,92,246,0.08) 0%, rgba(79,70,229,0.04) 100%);
    --gradient-admin: linear-gradient(135deg, rgba(88,28,135,0.2) 0%, rgba(30,27,75,0.3) 100%);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-head: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: all 0.2s cubic-bezier(0.4,0,0.2,1);
}

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

body {
    font-family: var(--font-head);
    background: var(--color-bg-deep);
    color: var(--color-text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ─── LOGIN PAGE ─── */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at 30% 20%, rgba(124,58,237,0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(79,70,229,0.08) 0%, transparent 50%),
                var(--color-bg-deep);
    padding: 24px;
}

.login-card {
    background: var(--gradient-admin);
    border: 1px solid var(--color-border-accent);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(139,92,246,0.1);
    backdrop-filter: blur(20px);
}

.login-logo {
    text-align: center;
    margin-bottom: 36px;
}
.login-logo-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
    box-shadow: 0 8px 24px rgba(124,58,237,0.4);
}
.login-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text-primary);
}
.login-subtitle {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 4px;
}

.form-group { margin-bottom: 20px; }
.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 8px;
}
.form-input {
    width: 100%;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 13px 16px;
    color: var(--color-text-primary);
    font-family: var(--font-head);
    font-size: 15px;
    transition: var(--transition);
}
.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: rgba(255,255,255,0.07);
    box-shadow: 0 0 0 3px rgba(124,58,237,0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 24px;
    font-family: var(--font-head);
    font-weight: 600;
    font-size: 15px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(124,58,237,0.3);
    width: 100%;
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(124,58,237,0.5);
}
.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}
.btn-secondary {
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 8px 16px;
    font-size: 13px;
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); }
.btn-danger {
    background: rgba(239,68,68,0.12);
    border: 1px solid rgba(239,68,68,0.2);
    color: var(--color-danger);
    padding: 6px 12px;
    font-size: 12px;
}
.btn-danger:hover {
    background: var(--color-danger);
    color: white;
}

/* ── 按钮点击动效（涟漪 + 按压缩放）── */
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(255,255,255,0.25) 0%, transparent 60%);
    opacity: 0;
    transform: scale(0);
    transition: opacity 0.5s ease, transform 0.5s ease;
    pointer-events: none;
}
.btn:active::after {
    opacity: 1;
    transform: scale(1.5);
    transition: 0s;
}
.btn:active {
    transform: scale(0.95);
}
.btn-primary:active {
    transform: translateY(1px) scale(0.95);
    box-shadow: 0 2px 10px rgba(124,58,237,0.2);
    filter: brightness(0.95);
}
.btn-secondary:active {
    background: rgba(255,255,255,0.14);
    transform: scale(0.95);
}
.btn-danger:active {
    background: hsl(350, 90%, 50%);
    transform: scale(0.95);
}
.btn:disabled,
.btn:disabled:hover {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}
.btn:disabled::after {
    display: none;
}

/* 其他可点击元素的按压反馈 */
.btn-refresh:active,
.segment-btn:active,
.btn-close-modal:active {
    transform: scale(0.90);
    filter: brightness(1.3);
    transition: transform 0.1s ease, filter 0.1s ease;
}

/* ─── ADMIN LAYOUT ─── */
.admin-layout { display: flex; min-height: 100vh; }

.sidebar {
    width: 240px;
    background: rgba(255,255,255,0.02);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px;
    margin-bottom: 32px;
}
.sidebar-logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}
.sidebar-logo-text {
    font-weight: 700;
    font-size: 15px;
    line-height: 1.2;
}
.sidebar-logo-sub {
    font-size: 11px;
    color: var(--color-primary-light);
    font-weight: 500;
}

.nav-section-title {
    font-size: 10px;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0 8px;
    margin-bottom: 8px;
    margin-top: 24px;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border: 1px solid transparent;
    margin-bottom: 2px;
}
.nav-item:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}
.nav-item.active {
    background: rgba(124,58,237,0.12);
    border-color: rgba(124,58,237,0.25);
    color: var(--color-primary-light);
}
.nav-icon { font-size: 16px; flex-shrink: 0; width: 20px; text-align: center; }
.nav-badge {
    margin-left: auto;
    background: var(--color-primary);
    color: white;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 10px;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}
.admin-user-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--color-border);
}
.admin-avatar {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}
.admin-user-email {
    font-size: 12px;
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
#btn-logout {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 14px;
    margin-left: auto;
    flex-shrink: 0;
    transition: var(--transition);
    padding: 4px;
}
#btn-logout:hover { color: var(--color-danger); }

/* ─── MAIN CONTENT ─── */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
    min-width: 0;
}

.page-header {
    margin-bottom: 28px;
}
.page-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-primary);
}
.page-subtitle {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-top: 4px;
}

/* ─── STATS CARDS ─── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}
.stat-card {
    background: var(--gradient-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    transition: var(--transition);
}
.stat-card:hover {
    border-color: rgba(139,92,246,0.2);
    transform: translateY(-2px);
}
.stat-icon { font-size: 24px; margin-bottom: 12px; }
.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text-primary);
    font-family: var(--font-head);
}
.stat-label {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-top: 4px;
    font-weight: 500;
}

/* ─── SECTION PANELS ─── */
.panel {
    background: var(--gradient-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    overflow: hidden;
}
.panel-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.panel-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-primary);
}
.panel-body { padding: 24px; }

/* ─── TABLE ─── */
.data-table-wrap { overflow-x: auto; }
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}
.data-table td {
    padding: 13px 16px;
    color: var(--color-text-primary);
    border-bottom: 1px solid rgba(255,255,255,0.03);
    vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--color-bg-hover); }

/* ─── BADGES ─── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
}
.badge-vip { background: rgba(139,92,246,0.15); color: #a78bfa; border: 1px solid rgba(139,92,246,0.25); }
.badge-trial { background: rgba(245,158,11,0.12); color: #fbbf24; border: 1px solid rgba(245,158,11,0.2); }
.badge-expired { background: rgba(239,68,68,0.12); color: #f87171; border: 1px solid rgba(239,68,68,0.2); }
.badge-admin { background: rgba(6,182,212,0.12); color: #22d3ee; border: 1px solid rgba(6,182,212,0.2); }
.badge-success { background: rgba(16,185,129,0.12); color: #34d399; border: 1px solid rgba(16,185,129,0.2); }
.badge-pending { background: rgba(107,114,128,0.12); color: #9ca3af; border: 1px solid rgba(107,114,128,0.2); }
.badge-used { background: rgba(239,68,68,0.12); color: #f87171; border: 1px solid rgba(239,68,68,0.2); }
.badge-unused { background: rgba(16,185,129,0.12); color: #34d399; border: 1px solid rgba(16,185,129,0.2); }

/* ─── SEARCH BAR ─── */
.search-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.search-input {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 8px 14px;
    color: var(--color-text-primary);
    font-family: var(--font-head);
    font-size: 13px;
    width: 240px;
    transition: var(--transition);
}
.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}
.search-input::placeholder { color: var(--color-text-muted); }

/* ─── CODE MANAGEMENT ─── */
.code-import-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 24px;
}
@media (min-width: 640px) {
    .code-import-grid { grid-template-columns: 2fr 1fr; }
}
.textarea-codes {
    min-height: 120px;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.6;
}
.select-input {
    width: 100%;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    color: var(--color-text-primary);
    font-family: var(--font-head);
    font-size: 14px;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}
.select-input:focus { outline: none; border-color: var(--color-primary); }
.select-input option { background: #1e1b4b; color: white; }

code, .mono { font-family: var(--font-mono); font-size: 12px; }

/* ─── EMPTY STATE ─── */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--color-text-muted);
}
.empty-state-icon { font-size: 36px; margin-bottom: 12px; display: block; }
.empty-state-text { font-size: 14px; }

/* ─── DIVIDER ─── */
.divider { height: 1px; background: var(--color-border); margin: 20px 0; }

/* ─── TOAST ─── */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    z-index: 9999;
    animation: toast-in 0.3s ease;
    max-width: 90vw;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.toast-success { background: rgba(16,185,129,0.9); color: white; }
.toast-error { background: rgba(239,68,68,0.9); color: white; }
.toast-info { background: rgba(124,58,237,0.9); color: white; }
.toast.hidden { display: none; }

@keyframes toast-in {
    from { opacity: 0; transform: translateX(-50%) translateY(12px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ─── UTILS ─── */
.hidden { display: none !important; }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }
.mt-4 { margin-top: 16px; }
.mt-2 { margin-top: 8px; }

/* ─── REFRESH BUTTON ─── */
.btn-refresh {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 6px 12px;
    font-size: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}
.btn-refresh:hover { background: rgba(255,255,255,0.1); color: var(--color-text-primary); }

@media (max-width: 768px) {
    .admin-layout { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: static; flex-direction: row; flex-wrap: wrap; gap: 8px; padding: 16px; }
    .sidebar-footer, .nav-section-title { display: none; }
    .main-content { padding: 16px; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* ─── MODAL STYLES ─── */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 15, 0.75);
    backdrop-filter: blur(12px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}
.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.modal-container {
    background: linear-gradient(135deg, rgba(20,20,30,0.95) 0%, rgba(10,10,15,0.98) 100%);
    border: 1px solid rgba(139,92,246,0.3);
    border-radius: var(--radius-lg);
    width: 95%;
    max-width: 920px;
    max-height: 80vh;
    overflow-y: auto;
    padding: 28px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.7), 0 0 0 1px rgba(139,92,246,0.1);
    transform: scale(0.95) translateY(20px);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.modal-overlay.active .modal-container {
    transform: scale(1) translateY(0);
}

/* Custom scrollbars matching the glassmorphic theme */
.modal-container::-webkit-scrollbar,
.data-table-wrap::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
.modal-container::-webkit-scrollbar-track,
.data-table-wrap::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 3px;
}
.modal-container::-webkit-scrollbar-thumb,
.data-table-wrap::-webkit-scrollbar-thumb {
    background: rgba(139, 92, 246, 0.3);
    border-radius: 3px;
    transition: var(--transition);
}
.modal-container::-webkit-scrollbar-thumb:hover,
.data-table-wrap::-webkit-scrollbar-thumb:hover {
    background: rgba(139, 92, 246, 0.6);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
}
.modal-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-primary);
}
.btn-close-modal {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 18px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.btn-close-modal:hover {
    background: rgba(239,68,68,0.15);
    border-color: rgba(239,68,68,0.3);
    color: var(--color-danger);
}
.clickable-cell {
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-color: rgba(255,255,255,0.15);
    transition: var(--transition);
}
.clickable-cell:hover {
    color: var(--color-primary-light);
    text-decoration-color: var(--color-primary-light);
}

/* Segmented Control / 分段按钮 */
.segmented-control {
    display: inline-flex;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 3px;
    gap: 2px;
    align-items: center;
}
.segment-btn {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    padding: 6px 14px;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 4px;
    height: 26px;
    line-height: 1;
}
.segment-btn:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.03);
}
.segment-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.3);
}