/**
 * Universal Theme System for Capstone/AccountFlow
 * Supports Dark/Light mode with CSS variables
 */

/* ========================================
   CSS VARIABLES - LIGHT THEME (DEFAULT)
   ======================================== */
:root {
    /* Background Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-sidebar: linear-gradient(180deg, #1e1b4b 0%, #312e81 100%);
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Accent Colors */
    --accent-primary: #7c3aed;
    --accent-hover: #6d28d9;
    --accent-light: #ede9fe;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-bg: #d1fae5;
    --warning-color: #f59e0b;
    --warning-bg: #fef3c7;
    --danger-color: #ef4444;
    --danger-bg: #fee2e2;
    --info-color: #3b82f6;
    --info-bg: #dbeafe;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   DARK THEME
   ======================================== */
[data-theme="dark"] {
    /* Background Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-sidebar: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    --bg-card: #1e293b;
    --bg-hover: #334155;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-inverse: #0f172a;
    
    /* Border Colors */
    --border-color: #334155;
    --border-light: #475569;
    
    /* Accent Colors */
    --accent-primary: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent-light: #4c1d95;
    
    /* Status Colors */
    --success-color: #34d399;
    --success-bg: #065f46;
    --warning-color: #fbbf24;
    --warning-bg: #92400e;
    --danger-color: #f87171;
    --danger-bg: #991b1b;
    --info-color: #60a5fa;
    --info-bg: #1e40af;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.6);
}

/* ========================================
   BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    line-height: 1.5;
}

/* ========================================
   SIDEBAR STYLES (UNIVERSAL)
   ======================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-sidebar);
    color: white;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-logo img {
    height: 32px;
    width: 32px;
    border-radius: 6px;
    object-fit: cover;
}

.brand-text h1 {
    font-size: 20px;
    margin: 0;
    color: white;
    font-weight: 600;
}

.brand-text span {
    font-size: 11px;
    color: #a78bfa;
    opacity: 0.9;
}

.nav-section {
    padding: 16px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-section-title {
    padding: 8px 24px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255,255,255,0.5);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

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

.nav-item.active {
    background: rgba(124, 58, 237, 0.2);
    color: white;
    border-left-color: #7c3aed;
}

.nav-item i {
    width: 20px;
    text-align: center;
}

/* ========================================
   MAIN CONTENT
   ======================================== */
.main-content {
    margin-left: 280px;
    padding: 24px;
    min-height: 100vh;
    transition: margin var(--transition-normal);
}

.top-bar {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 24px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.page-title h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.page-title p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ========================================
   CARDS & WIDGETS
   ======================================== */
.card, .widget-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

/* ========================================
   BUTTONS
   ======================================== */
.btn, button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* Theme Toggle Button */
.theme-toggle {
    padding: 10px 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--accent-primary);
    color: white;
}

/* ========================================
   FORMS & INPUTS
   ======================================== */
input, select, textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-light);
}

input::placeholder {
    color: var(--text-muted);
}

label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

/* ========================================
   TABLES
   ======================================== */
table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

tr:hover {
    background: var(--bg-hover);
}

/* ========================================
   STATUS BADGES
   ======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success-color);
}

.badge-warning {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.badge-danger {
    background: var(--danger-bg);
    color: var(--danger-color);
}

/* ========================================
   MOBILE HEADER
   ======================================== */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-sidebar);
    color: white;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.mobile-menu-btn {
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background var(--transition-fast);
}

.mobile-menu-btn:hover {
    background: rgba(255,255,255,0.1);
}

.mobile-logo {
    font-size: 18px;
    font-weight: 600;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sidebar-overlay.show {
    display: block;
    opacity: 1;
}

/* ========================================
   MOBILE RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 1001;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 80px 16px 16px;
    }
    
    .mobile-header {
        display: flex;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }