/* ==========================================
   CleanPlatform Design System
   ========================================== */

/* ─── CSS Variables ─────────────────────── */
:root {
    /* Brand Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-secondary: #059669;
    --color-secondary-dark: #047857;
    --color-accent: #8b5cf6;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed: 64px;
    --topbar-height: 60px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-sm: 4px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);

    /* Transitions */
    --transition: 150ms ease;
}

/* ─── Reset & Base ──────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

img { max-width: 100%; height: auto; }
table { border-collapse: collapse; width: 100%; }

/* ─── Typography ────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-gray-900);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

.text-muted { color: var(--color-gray-500); }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-medium { font-weight: 500; }
.font-bold { font-weight: 700; }

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition);
    overflow-y: auto;
}

.sidebar-brand {
    padding: var(--space-5) var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-brand h1 {
    font-size: var(--text-lg);
    color: var(--color-white);
    font-weight: 700;
}

.sidebar-brand .logo-icon {
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    color: white;
    flex-shrink: 0;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-4) 0;
}

.nav-section {
    padding: var(--space-2) var(--space-6);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    margin-top: var(--space-4);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-6);
    color: var(--color-gray-400);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    color: var(--color-white);
    background: rgba(255,255,255,0.05);
}

.nav-link.active {
    color: var(--color-white);
    background: rgba(255,255,255,0.08);
    border-left-color: var(--color-primary);
}

.nav-link .nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-link.active .nav-icon {
    opacity: 1;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Bar */
.topbar {
    height: var(--topbar-height);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.topbar .page-title {
    font-size: var(--text-lg);
    font-weight: 600;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    color: var(--color-gray-600);
}

/* Page Content */
.page-content {
    flex: 1;
    padding: var(--space-6);
    max-width: 1400px;
    width: 100%;
}

/* ─── Cards ─────────────────────────────── */
.card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h3 {
    font-size: var(--text-base);
    font-weight: 600;
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-gray-100);
    background: var(--color-gray-50);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* ─── Stat Cards (Dashboard) ────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    border: 1px solid var(--color-gray-200);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    transition: box-shadow var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.stat-icon.blue { background: var(--color-primary-light); color: var(--color-primary); }
.stat-icon.green { background: #d1fae5; color: var(--color-secondary); }
.stat-icon.purple { background: #ede9fe; color: var(--color-accent); }
.stat-icon.orange { background: #fff7ed; color: #ea580c; }
.stat-icon.red { background: #fee2e2; color: var(--color-danger); }

.stat-content h4 {
    font-size: var(--text-2xl);
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-1);
}

.stat-content p {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

/* ─── Buttons ───────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    font-family: var(--font-family);
    border-radius: var(--border-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.5;
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-gray-700);
    border-color: var(--color-gray-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

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

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

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
}

.btn-block {
    width: 100%;
}

/* ─── Forms ─────────────────────────────── */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--space-1);
}

.form-control {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    font-family: var(--font-family);
    color: var(--color-gray-800);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius);
    transition: border-color var(--transition), box-shadow var(--transition);
    line-height: 1.5;
}

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

.form-control::placeholder {
    color: var(--color-gray-400);
}

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

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236b7280'%3e%3cpath fill-rule='evenodd' d='M5.23 7.21a.75.75 0 011.06.02L10 11.168l3.71-3.938a.75.75 0 111.08 1.04l-4.25 4.5a.75.75 0 01-1.08 0l-4.25-4.5a.75.75 0 01.02-1.06z' clip-rule='evenodd' /%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1.5em;
    padding-right: 2.5rem;
}

.form-hint {
    font-size: var(--text-xs);
    color: var(--color-gray-500);
    margin-top: var(--space-1);
}

.form-error {
    font-size: var(--text-xs);
    color: var(--color-danger);
    margin-top: var(--space-1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.data-table td {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-gray-100);
    vertical-align: middle;
}

.data-table tr:hover td {
    background: var(--color-gray-50);
}

/* ─── Badges ────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: 9999px;
    line-height: 1.4;
}

.badge-primary { background: var(--color-primary-light); color: var(--color-primary-dark); }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-gray { background: var(--color-gray-100); color: var(--color-gray-600); }

/* ─── Alerts / Flash ────────────────────── */
.alert {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius);
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error   { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }
.alert-info    { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }

/* ─── Dropdown ──────────────────────────── */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: var(--space-1) 0;
    z-index: 200;
    display: none;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-gray-700);
    transition: background var(--transition);
}

.dropdown-item:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

.dropdown-divider {
    border-top: 1px solid var(--color-gray-100);
    margin: var(--space-1) 0;
}

/* ─── Notifications Bell ────────────────── */
.notification-bell {
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    color: var(--color-gray-500);
    transition: color var(--transition);
}

.notification-bell:hover {
    color: var(--color-gray-800);
}

.notification-bell .badge {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 18px;
    height: 18px;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

/* ─── User Avatar ───────────────────────── */
.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 600;
    flex-shrink: 0;
}

.avatar-sm { width: 28px; height: 28px; font-size: var(--text-xs); }
.avatar-lg { width: 48px; height: 48px; font-size: var(--text-lg); }

/* ─── Empty State ───────────────────────── */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-6);
    color: var(--color-gray-500);
}

.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.empty-state p {
    margin-bottom: var(--space-6);
    max-width: 400px;
    margin-inline: auto;
}

/* ─── Guest Layout (Login/Register) ────── */
.guest-layout {
    display: flex;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-gray-900) 0%, #1e3a5f 50%, var(--color-primary-dark) 100%);
    padding: var(--space-6);
}

.guest-card {
    width: 100%;
    max-width: 440px;
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.guest-card-header {
    padding: var(--space-8) var(--space-8) var(--space-4);
    text-align: center;
}

.guest-card-header .brand-logo {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    border-radius: var(--border-radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: var(--space-4);
}

.guest-card-header h2 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-1);
}

.guest-card-header p {
    color: var(--color-gray-500);
    font-size: var(--text-sm);
}

.guest-card-body {
    padding: var(--space-4) var(--space-8) var(--space-8);
}

.guest-card-footer {
    padding: var(--space-4) var(--space-8);
    background: var(--color-gray-50);
    text-align: center;
    font-size: var(--text-sm);
    color: var(--color-gray-500);
    border-top: 1px solid var(--color-gray-100);
}

/* ─── Utilities ─────────────────────────── */
.d-flex { display: flex; }
.d-grid { display: grid; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.hidden { display: none !important; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.w-full { width: 100%; }

/* ─── Responsive ────────────────────────── */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

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

    .sidebar-toggle {
        display: block;
    }

    .page-content {
        padding: var(--space-4);
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .topbar {
        padding: 0 var(--space-4);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.sidebar-overlay.show {
    display: block;
}

/* ─── Loading Indicators ────────────────── */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline-block;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ─── Print Styles ──────────────────────── */
@media print {
    .sidebar, .topbar, .sidebar-overlay { display: none !important; }
    .main-content { margin-left: 0 !important; }
    .page-content { padding: 0 !important; }
    .card { box-shadow: none; border: 1px solid #ddd; }
}