/* ============================================
   RESET & BASE STYLES
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Shadows+Into+Light&display=swap');

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

:root {
    /* Colors */
    --primary-color: #2c3e50;
    --primary-dark: #1a252f;
    --primary-light: #34495e;
    --accent-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #ecf0f1;
    --border-color: #e0e0e0;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.15);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Sidebar */
    --sidebar-width: 240px;
    --sidebar-width-mobile: 280px;
}

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

/* ============================================
   PAGE LAYOUT
   ============================================ */
.page-layout {
    display: flex;
    min-height: 100vh;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #1f2937 0%, #111827 60%, #0b1220 100%);
    box-shadow: var(--shadow-md);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
    transition: transform var(--transition-base);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
    background: transparent;
    color: var(--text-light);
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

.sidebar-header h2 {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    font-size: 50px;
    height: 69px;
    margin: 0;
    font-weight: 400;
    font-family: 'Shadows Into Light', cursive;
    letter-spacing: 8px;
    color: rgba(14, 179, 221, 1);
    background: unset;
    background-color: unset;
    border-color: rgba(0, 0, 0, 0);
    border-image: none;
}

.nav-menu {
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.logout-section {
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl) var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    margin-top: auto;
    flex-shrink: 0;
    background: transparent;
}

.nav-btn {
    display: flex;
    align-items: center;
    padding: 12px var(--spacing-lg);
    color: var(--text-light);
    text-decoration: none;
    transition: all var(--transition-base);
    border-left: 2px solid transparent;
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    user-select: none;
    border-radius: 8px;
    background: rgba(255,255,255,0.03);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.07);
    border-left-color: #4f9cf9;
    transform: translateX(2px);
}

.nav-btn.active {
    background: linear-gradient(90deg, rgba(79,156,249,0.18), rgba(79,156,249,0.1));
    border-left-color: #4f9cf9;
    color: #fff;
    font-weight: 700;
    box-shadow: 0 3px 8px rgba(0,0,0,0.12);
}

.nav-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none !important;
    filter: saturate(0.3);
    color: rgba(255,255,255,0.4) !important;
    background: rgba(255,255,255,0.06) !important;
    border-left-color: transparent !important;
    transform: none !important;
    box-shadow: none !important;
}

.nav-btn.disabled:hover {
    background: rgba(255,255,255,0.06) !important;
    border-left-color: transparent !important;
    transform: none !important;
    box-shadow: none !important;
    color: rgba(255,255,255,0.4) !important;
}

.nav-btn.disabled span {
    color: rgba(255,255,255,0.4) !important;
}

/* Icon removed - no longer needed */

.logout-section .nav-btn-logout {
    margin-top: 0;
    border-top: none;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: 0;
    background: rgba(255, 255, 255, 0.06);
    border-left-color: #9aa4b5;
    border-left-width: 3px;
    font-weight: 700;
    color: #e5e7eb;
    position: relative;
    border-radius: 8px;
}

.logout-section .nav-btn-logout::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
}

.logout-section .nav-btn-logout:hover {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: #b0bacb;
    transform: translateX(2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

/* Logout icon removed */

/* Footer removed */

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    width: calc(100% - var(--sidebar-width));
    background: var(--bg-white);
    min-height: 100vh;
}

.page-header {
    background: var(--bg-white);
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-header h1 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    font-weight: 600;
    margin: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-info-mobile {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    display: none;
}

.content {
    padding: var(--spacing-2xl);
    min-height: calc(100vh - 100px);
}

/* ============================================
   WELCOME SCREEN
   ============================================ */
.welcome-screen {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.welcome-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.3;
}

.welcome-screen h2 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.welcome-screen p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

/* ============================================
   ERROR MESSAGE
   ============================================ */
.error-message {
    text-align: center;
    padding: var(--spacing-2xl);
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 4px;
    margin: var(--spacing-xl);
}

.error-message h2 {
    color: var(--danger-color);
    margin-bottom: var(--spacing-md);
}

.error-message p {
    color: var(--text-primary);
}

/* ============================================
   MOBILE MENU
   ============================================ */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    z-index: 1001;
    background: var(--primary-color);
    color: var(--bg-white);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 4px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    flex-direction: column;
    gap: 4px;
    width: 40px;
    height: 40px;
    justify-content: center;
    align-items: center;
}

.mobile-menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--bg-white);
    transition: all var(--transition-base);
}

.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-base);
}

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

/* ============================================
   LOADING OVERLAY
   ============================================ */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width-mobile);
    }

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

    .main-content {
        margin-left: 0;
        width: 100%;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .page-header {
        padding: var(--spacing-lg);
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .user-info-mobile {
        display: block;
    }

    .content {
        padding: var(--spacing-lg);
    }

    .welcome-screen {
        padding: var(--spacing-xl) var(--spacing-md);
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }