/* ========================================================
   BacklinkFlow - Modern Responsive CSS Design System
   ======================================================== */

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --success: #10b981;
    --success-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --info: #06b6d4;
    --info-light: #ecfeff;

    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --bg-sidebar: #0f172a;
    --text-sidebar: #94a3b8;
    --text-sidebar-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 15px;
}

/* App Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: var(--bg-sidebar);
    color: var(--text-sidebar);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
}

.sidebar-brand {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-icon {
    font-size: 24px;
}

.brand-name {
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-sidebar);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-item:hover {
    color: var(--text-sidebar-hover);
    background: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    color: #ffffff;
    background: var(--primary);
}

.nav-icon {
    font-size: 18px;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    font-size: 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    padding: 4px;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    color: #ffffff;
    font-weight: 600;
    font-size: 14px;
}

.logout-link {
    color: #94a3b8;
    font-size: 12px;
    text-decoration: none;
}

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

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 250px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-bar {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: 18px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.system-time {
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg-page);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.content-container {
    padding: 32px;
    flex: 1;
}

/* Auth Page */
.auth-page {
    background: #0f172a;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: var(--bg-surface);
    width: 100%;
    max-width: 420px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 36px;
}

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

.auth-brand-icon {
    font-size: 36px;
    margin-bottom: 8px;
}

.auth-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-muted);
}

/* Alerts */
.flash-messages {
    margin-bottom: 24px;
}

.alert {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: var(--success-light);
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error, .alert-danger {
    background: var(--danger-light);
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: var(--warning-light);
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-info {
    background: var(--info-light);
    color: #155e75;
    border: 1px solid #a5f3fc;
}

/* Cards & Grid */
.grid {
    display: grid;
    gap: 24px;
}

.grid-cols-4 {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.grid-cols-2 {
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
}

.card {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 24px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
}

.card-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card {
    display: flex;
    flex-direction: column;
    padding: 20px 24px;
    border-left: 4px solid var(--primary);
}

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

.stat-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin: 8px 0;
}

.stat-sub {
    font-size: 12px;
    color: var(--text-muted);
}

/* Forms */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
    background: #ffffff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

textarea.form-control {
    min-height: 100px;
    font-family: inherit;
    resize: vertical;
}

.form-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
}

.btn-primary {
    background: var(--primary);
    color: #ffffff;
}

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

.btn-success {
    background: var(--success);
    color: #ffffff;
}

.btn-success:hover {
    background: #059669;
}

.btn-warning {
    background: var(--warning);
    color: #ffffff;
}

.btn-warning:hover {
    background: #d97706;
}

.btn-danger {
    background: var(--danger);
    color: #ffffff;
}

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

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

.btn-outline:hover {
    background: var(--bg-page);
    border-color: var(--text-secondary);
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

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

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--bg-page);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}

.table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.table tbody tr:hover {
    background: #fafbfd;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-idea { background: #f1f5f9; color: #475569; }
.badge-drafted { background: var(--info-light); color: #0891b2; }
.badge-approved { background: var(--warning-light); color: #d97706; }
.badge-scheduled { background: #ede9fe; color: #7c3aed; }
.badge-published { background: var(--success-light); color: #059669; }
.badge-failed { background: var(--danger-light); color: #dc2626; }

.badge-dofollow { background: #ecfdf5; color: #047857; font-weight: 700; }
.badge-nofollow { background: #fef2f2; color: #b91c1c; font-weight: 700; }

/* Filter bar & Action bar */
.actions-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .sidebar {
        width: 70px;
    }
    .brand-name, .sidebar-nav span:not(.nav-icon), .user-details {
        display: none;
    }
    .sidebar-brand {
        justify-content: center;
        padding: 20px 0;
    }
    .nav-item {
        justify-content: center;
        padding: 12px 0;
    }
    .main-content {
        margin-left: 70px;
    }
}