/* ============================================
   Modern UI Design System
   Responsive for PC & Mobile
   ============================================ */

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Light Theme */
    --bg-light: #f8fafc;
    --bg-card-light: #ffffff;
    --text-light: #1e293b;
    --text-muted-light: #64748b;
    --border-light: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    
    /* Dark Theme */
    --bg-dark: #0f172a;
    --bg-card-dark: #1e293b;
    --bg-card-dark-hover: #334155;
    --text-dark: #e2e8f0;
    --text-muted-dark: #94a3b8;
    --border-dark: #334155;
    --shadow-dark: rgba(0, 0, 0, 0.3);
    
    /* Layout */
    --sidebar-width: 280px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 0.75rem;
    
    /* Current Theme (Default: Light) */
    --bg: var(--bg-light);
    --bg-card: var(--bg-card-light);
    --text: var(--text-light);
    --text-muted: var(--text-muted-light);
    --border: var(--border-light);
    --shadow: var(--shadow-light);
}

/* Dark Mode */
body.dark-mode {
    --bg: var(--bg-dark);
    --bg-card: var(--bg-card-dark);
    --text: var(--text-dark);
    --text-muted: var(--text-muted-dark);
    --border: var(--border-dark);
    --shadow: var(--shadow-dark);
    background-color: var(--bg-dark) !important;
}

body.dark-mode * {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: var(--transition);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header Styles */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 10px var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 1.5rem;
    max-width: 100%;
}

.hamburger-menu {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    color: var(--primary);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.hamburger-menu:hover {
    background-color: var(--bg);
    transform: scale(1.1);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
}

.header-brand i {
    font-size: 1.5rem;
    color: var(--primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle-btn:hover {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: scale(1.1);
}

.user-dropdown {
    position: relative;
}

.user-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
}

.user-btn:hover {
    background-color: var(--bg);
    border-color: var(--primary);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-weight: 500;
}

.dropdown-icon {
    font-size: 0.875rem;
    transition: var(--transition);
}

.user-dropdown.active .dropdown-icon {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 200px;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 25px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}

.user-dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background-color: var(--bg);
    color: var(--primary);
}

.dropdown-item.text-danger:hover {
    color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border);
    margin: 0.5rem 0;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: calc(-1 * var(--sidebar-width));
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-card);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 2px 0 10px var(--shadow);
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h4 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
}

.sidebar-header i {
    color: var(--primary);
    font-size: 1.5rem;
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    color: var(--text);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    margin: 0.25rem 0;
}

.nav-item i {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.nav-item:hover {
    background-color: var(--bg);
    color: var(--primary);
    border-left-color: var(--primary);
    transform: translateX(5px);
}

.nav-item.active {
    background-color: var(--primary);
    color: white;
    border-left-color: var(--primary-dark);
}

.nav-item.active i {
    color: white;
}

.nav-logout {
    margin-top: 1rem;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
    color: var(--danger);
}

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

/* Sidebar Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 998;
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Main Content */
.main-content {
    margin-left: 0;
    margin-top: var(--header-height);
    padding: 2rem;
    min-height: calc(100vh - var(--header-height));
    transition: var(--transition);
}

@media (min-width: 992px) {
    .sidebar {
        left: 0;
    }
    
    .main-content {
        margin-left: var(--sidebar-width);
    }
    
    .hamburger-menu {
        display: none;
    }
}

/* Card Styles */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px var(--shadow);
    transition: var(--transition);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.card:hover {
    box-shadow: 0 10px 20px var(--shadow);
    transform: translateY(-2px);
}

.card-header {
    padding: 1.25rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-bottom: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-header h5 {
    margin: 0;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* Form Styles */
.form-control,
.form-select {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text);
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    background-color: var(--bg-card);
    border-color: var(--primary);
    color: var(--text);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    outline: none;
}

.form-label {
    color: var(--text);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

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

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

/* Table Styles */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    background-color: var(--bg);
    color: var(--text);
    font-weight: 600;
    padding: 1rem;
    text-align: left;
    border-bottom: 2px solid var(--border);
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.table-hover tbody tr:hover {
    background-color: var(--bg);
}

/* Alert Styles - Glassmorphism */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: slideInDown 0.5s ease-out;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    color: #fee2e2;
    border: 1px solid rgba(239, 68, 68, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.dark-mode .alert-danger {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border-color: rgba(239, 68, 68, 0.5);
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    color: #d1fae5;
    border: 1px solid rgba(16, 185, 129, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.dark-mode .alert-success {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
    border-color: rgba(16, 185, 129, 0.5);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.15);
    color: #fef3c7;
    border: 1px solid rgba(245, 158, 11, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.dark-mode .alert-warning {
    background: rgba(245, 158, 11, 0.2);
    color: #fcd34d;
    border-color: rgba(245, 158, 11, 0.5);
}

.alert-info {
    background: rgba(59, 130, 246, 0.15);
    color: #dbeafe;
    border: 1px solid rgba(59, 130, 246, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.dark-mode .alert-info {
    background: rgba(59, 130, 246, 0.2);
    color: #93c5fd;
    border-color: rgba(59, 130, 246, 0.5);
}

/* Stats Card */
.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 10px var(--shadow);
    transition: var(--transition);
    margin-bottom: 1.5rem;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow);
}

.stat-card i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.stat-card h3 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 1rem;
    opacity: 0.9;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        padding: 0 1rem;
    }
    
    .header-brand span {
        display: none;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .stat-card h3 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .user-name {
        display: none;
    }
    
    .dropdown-menu {
        right: -50%;
        min-width: 180px;
    }
}

/* Utility Classes */
.d-none {
    display: none;
}

.d-md-inline {
    display: none;
}

@media (min-width: 768px) {
    .d-md-inline {
        display: inline;
    }
}

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

.mb-0 {
    margin-bottom: 0;
}

.mt-3 {
    margin-top: 1rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-out;
}