/* ===================================
   MENTORAX LMS - MOBILE-FIRST DESIGN
   Modern, Animated, Professional
   =================================== */

/* ===== ROOT VARIABLES ===== */
:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #7c8ff1;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #4ade80;
    --warning-color: #fbbf24;
    --danger-color: #f87171;
    --info-color: #60a5fa;
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-dark: #111827;
    
    --border-color: #e5e7eb;
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 24px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    --navbar-height: 64px;
    --bottom-nav-height: 64px;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    padding-bottom: var(--bottom-nav-height);
}

/* ===== MOBILE-FIRST CONTAINER ===== */
.app-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    min-height: 100vh;
}

@media (min-width: 768px) {
    .app-container {
        max-width: 768px;
    }
}

@media (min-width: 1024px) {
    .app-container {
        max-width: 1200px;
        padding: 0 24px;
    }
}

/* ===== MODERN NAVBAR (MOBILE APP STYLE) ===== */
.mobile-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    backdrop-filter: blur(10px);
    animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.mobile-navbar .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: transform var(--transition-base);
}

.mobile-navbar .logo:hover {
    transform: scale(1.05);
}

.mobile-navbar .nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-navbar .nav-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.mobile-navbar .nav-icon:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.mobile-navbar .nav-icon:active {
    transform: scale(0.95);
}

.mobile-navbar .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger-color);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid white;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

/* ===== CONTENT AREA ===== */
.main-content {
    margin-top: var(--navbar-height);
    padding: 16px;
    min-height: calc(100vh - var(--navbar-height) - var(--bottom-nav-height));
}

@media (min-width: 768px) {
    .main-content {
        padding: 24px;
    }
}

/* ===== MODERN CARDS ===== */
.card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 20px;
    margin-bottom: 16px;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    animation: fadeInUp 0.5s ease-out;
}

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

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.card-header {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-header .icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.card-body {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== MODERN BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--transition-base), height var(--transition-base);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

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

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, var(--success-color) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, var(--danger-color) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
}

/* ===== BOTTOM NAVIGATION (MOBILE APP STYLE) ===== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--bg-primary);
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 1000;
    border-top: 1px solid var(--border-color);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (min-width: 1024px) {
    .bottom-nav {
        display: none;
    }
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all var(--transition-base);
    position: relative;
}

.bottom-nav-item .icon {
    font-size: 1.5rem;
    transition: all var(--transition-base);
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
    color: var(--primary-color);
}

.bottom-nav-item.active .icon {
    transform: scale(1.2);
}

.bottom-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 0 0 3px 3px;
    transition: width var(--transition-base);
}

.bottom-nav-item.active::before {
    width: 60%;
}

/* ===== FORM ELEMENTS ===== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

/* ===== GRID SYSTEM ===== */
.grid {
    display: grid;
    gap: 16px;
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===== STAT CARDS ===== */
.stat-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--border-radius);
    padding: 24px;
    color: white;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    animation: fadeInUp 0.5s ease-out;
}

.stat-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ===== LIST ITEMS ===== */
.list-item {
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.list-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.list-item .item-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.list-item .item-content {
    flex: 1;
}

.list-item .item-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.list-item .item-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.list-item .item-action {
    color: var(--primary-color);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.list-item .item-action:hover {
    transform: scale(1.2);
}

/* ===== BADGES ===== */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

.badge-success {
    background: rgba(74, 222, 128, 0.1);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(251, 191, 36, 0.1);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(248, 113, 113, 0.1);
    color: var(--danger-color);
}

/* ===== LOADING SPINNER ===== */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== MODAL (MOBILE-FIRST) ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@media (min-width: 768px) {
    .modal-overlay {
        align-items: center;
    }
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUpModal var(--transition-base);
}

@keyframes slideUpModal {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

@media (min-width: 768px) {
    .modal-content {
        border-radius: var(--border-radius-lg);
        max-width: 600px;
        animation: scaleIn var(--transition-base);
    }
    
    @keyframes scaleIn {
        from {
            transform: scale(0.9);
            opacity: 0;
        }
        to {
            transform: scale(1);
            opacity: 1;
        }
    }
}

/* ===== UTILITIES ===== */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.hidden {
    display: none;
}

@media (min-width: 1024px) {
    .hidden-desktop {
        display: none;
    }
}

@media (max-width: 1023px) {
    .hidden-mobile {
        display: none;
    }
}

/* ===== PAGE TRANSITIONS ===== */
.page-enter {
    animation: pageEnter var(--transition-slow);
}

@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== SMOOTH SCROLLING ===== */
html {
    scroll-behavior: smooth;
}

/* ===== CUSTOM SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}