/* ============================================
   ADMIN DOCUMENTATION STYLES
   ============================================ */

:root {
    --primary: #3B82F6;
    --secondary: #8B5CF6;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --dark: #1E293B;
    --light: #F8FAFC;
    --border: #E2E8F0;
    --text: #334155;
    --text-light: #64748B;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #10B981 0%, #059669 100%);
    --gradient-warning: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
}

/* ============================================
   DOCUMENTATION HEADER
   ============================================ */
.doc-header {
    background: var(--gradient-primary);
    color: white;
    padding: 40px 0;
    position: relative;
    overflow: hidden;
    margin-bottom: 0;
    border-radius: 16px 16px 0 0;
}

.doc-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255, 255, 255, 0.05) 10px,
        rgba(255, 255, 255, 0.05) 20px
    );
    animation: moveStripes 20s linear infinite;
}

@keyframes moveStripes {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.doc-header-content {
    position: relative;
    z-index: 1;
    padding: 0 24px;
}

.doc-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.doc-subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 500;
}

.doc-meta {
    display: flex;
    gap: 32px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.15);
    padding: 8px 16px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

/* ============================================
   NAVIGATION TABS
   ============================================ */
.doc-nav {
    position: sticky;
    top: 0;
    background: white;
    border-bottom: 2px solid var(--border);
    padding: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    margin-bottom: 32px;
}

.nav-tabs {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 0 24px;
}

.nav-tabs::-webkit-scrollbar {
    display: none;
}

.nav-tab {
    padding: 16px 24px;
    border: none;
    background: transparent;
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    position: relative;
    white-space: nowrap;
    transition: all 0.3s ease;
}

.nav-tab:hover {
    color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.nav-tab.active {
    color: var(--primary);
}

.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 3px 3px 0 0;
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */
.doc-content {
    padding: 0;
}

.doc-section {
    display: none;
    animation: fadeIn 0.5s ease;
}

.doc-section.active {
    display: block;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 3px solid var(--primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.subsection-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin: 32px 0 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-placeholder {
    padding: 60px 40px;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 16px;
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
    border: 2px dashed var(--border);
}

.section-placeholder i {
    font-size: 3rem;
    display: block;
    margin-bottom: 16px;
    color: var(--primary);
}

/* ============================================
   CARDS & BLOCKS
   ============================================ */
.info-card {
    background: var(--light);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    border-left: 4px solid var(--primary);
}

.info-card.success {
    border-left-color: var(--success);
}

.info-card.warning {
    border-left-color: var(--warning);
}

.info-card.danger {
    border-left-color: var(--danger);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 24px 0;
}

.service-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 16px;
    color: white;
}

.service-icon.firebase {
    background: linear-gradient(135deg, #FFCA28 0%, #FFA000 100%);
}

.service-icon.cloudflare {
    background: linear-gradient(135deg, #F38020 0%, #F6821F 100%);
}

.service-icon.stripe {
    background: linear-gradient(135deg, #635BFF 0%, #5551FF 100%);
}

.service-icon.resend {
    background: linear-gradient(135deg, #000000 0%, #333333 100%);
}

.service-name {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--dark);
}

.service-desc {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ============================================
   ARCHITECTURE DIAGRAM
   ============================================ */
.architecture-diagram {
    background: white;
    border: 2px solid var(--border);
    border-radius: 20px;
    padding: 40px;
    margin: 32px 0;
    overflow-x: auto;
}

.diagram-layer {
    margin-bottom: 32px;
    position: relative;
}

.layer-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.layer-boxes {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.diagram-box {
    background: var(--gradient-primary);
    color: white;
    padding: 20px 28px;
    border-radius: 12px;
    font-weight: 600;
    text-align: center;
    min-width: 180px;
    box-shadow: var(--shadow-md);
    position: relative;
}

.diagram-box.secondary {
    background: var(--gradient-success);
}

.diagram-box.warning {
    background: var(--gradient-warning);
}

.diagram-arrow {
    text-align: center;
    font-size: 2rem;
    color: var(--primary);
    margin: 16px 0;
}

/* ============================================
   CODE BLOCKS
   ============================================ */
.code-block {
    background: #1E293B;
    color: #E2E8F0;
    padding: 24px;
    border-radius: 12px;
    overflow-x: auto;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 16px 0;
    position: relative;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.code-lang {
    color: #10B981;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
}

.copy-btn {
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

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

/* ============================================
   TABLES
   ============================================ */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table thead {
    background: var(--gradient-primary);
    color: white;
}

.data-table th {
    padding: 16px;
    text-align: left;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-right: 8px;
}

.badge.primary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
}

.badge.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.badge.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.badge.danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

/* ============================================
   STATS GRID
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 24px 0;
}

.stat-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-value {
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.95rem;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .doc-header {
        border-radius: 0;
    }

    .doc-header-content {
        padding: 0 16px;
    }

    .doc-title {
        font-size: 1.8rem;
    }

    .doc-nav {
        padding: 0;
    }

    .nav-tabs {
        padding: 0 16px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .card-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .architecture-diagram {
        padding: 20px;
    }

    .layer-boxes {
        flex-direction: column;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .sidebar,
    .top-header,
    .doc-nav {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
    }

    .doc-section {
        display: block !important;
        page-break-after: always;
    }

    .doc-header {
        page-break-after: avoid;
    }
}