/**
 * Bheem Academy Components 2025
 * Glassmorphism, 3D Effects, Animations
 */

/* ================================================
   SUBTLE 3D TILT EFFECTS
   ================================================ */

.tilt-card {
    position: relative;
    transform-style: preserve-3d;
    transition: transform var(--transition-base);
    will-change: transform;
}

.tilt-card:hover {
    transform: perspective(1000px) rotateX(2deg) rotateY(2deg) translateY(-4px);
}

/* Only enable 3D on desktop */
@media (max-width: 768px) {
    .tilt-card:hover {
        transform: translateY(-2px);
    }
}

/* ================================================
   ANIMATED ICONS
   ================================================ */

.icon-animated {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.icon-animated:hover {
    transform: scale(1.1);
}

.icon-pulse {
    animation: iconPulse 2s ease-in-out infinite;
}

@keyframes iconPulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.icon-float {
    animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-6px);
    }
}

/* ================================================
   COURSE CARD COMPONENT
   ================================================ */

.course-card {
    background: var(--color-surface);
    backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-violet), var(--color-primary-indigo), var(--color-primary-cyan));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl), var(--glow-violet);
    border-color: rgba(139, 92, 246, 0.4);
}

.course-card:hover::before {
    opacity: 1;
}

.course-card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.course-card-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

/* ================================================
   BUTTON COMPONENTS
   ================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-violet), var(--color-primary-indigo));
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--color-surface);
    backdrop-filter: blur(16px);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.btn-secondary:hover {
    border-color: var(--color-primary-violet);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

/* ================================================
   BADGE COMPONENTS
   ================================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
}

.badge-violet {
    background: rgba(139, 92, 246, 0.1);
    color: var(--color-primary-violet);
}

.badge-indigo {
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary-indigo);
}

.badge-cyan {
    background: rgba(6, 182, 212, 0.1);
    color: var(--color-primary-cyan);
}

/* ================================================
   SCROLL-TRIGGERED FADE IN (Minimal)
   ================================================ */

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--transition-base), transform 0.6s var(--transition-base);
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays */
.fade-in-up:nth-child(1) { transition-delay: 0ms; }
.fade-in-up:nth-child(2) { transition-delay: 100ms; }
.fade-in-up:nth-child(3) { transition-delay: 200ms; }
.fade-in-up:nth-child(4) { transition-delay: 300ms; }

/* ================================================
   PROGRESS INDICATORS
   ================================================ */

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary-violet), var(--color-primary-indigo), var(--color-primary-cyan));
    border-radius: var(--radius-full);
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: progressShimmer 1.5s infinite;
}

@keyframes progressShimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.progress-ring {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring-circle {
    fill: none;
    stroke: var(--color-primary-violet);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.progress-ring-bg {
    fill: none;
    stroke: var(--color-bg-tertiary);
    stroke-width: 8;
}

.progress-ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
}

/* ================================================
   STATS GRID
   ================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.stat-card {
    background: var(--color-surface);
    backdrop-filter: blur(16px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* ================================================
   TABBED NAVIGATION
   ================================================ */

.tabs {
    display: flex;
    gap: var(--space-2);
    border-bottom: 1px solid var(--color-divider);
    margin-bottom: var(--space-6);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.tab:hover {
    color: var(--color-text-primary);
}

.tab.active {
    color: var(--color-primary-violet);
    border-bottom-color: var(--color-primary-violet);
}

.tab-content {
    animation: fadeIn 0.3s ease-out;
}

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

/* ================================================
   AVATAR & PROFILE
   ================================================ */

.avatar {
    position: relative;
    display: inline-block;
}

.avatar-img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-border);
    object-fit: cover;
}

.avatar-sm .avatar-img {
    width: 32px;
    height: 32px;
}

.avatar-lg .avatar-img {
    width: 64px;
    height: 64px;
}

.avatar-online::after {
    content: '';
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    background: #10B981;
    border-radius: 50%;
    border: 2px solid var(--color-bg-primary);
}

/* ================================================
   DIVIDER
   ================================================ */

.divider {
    height: 1px;
    background: var(--color-divider);
    margin: var(--space-8) 0;
}

.divider-vertical {
    width: 1px;
    height: 100%;
    background: var(--color-divider);
}

/* ================================================
   SKELETON LOADERS
   ================================================ */

.skeleton {
    background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s infinite;
    border-radius: var(--radius-base);
}

@keyframes skeletonShimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--space-2);
}

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--space-4);
}

.skeleton-card {
    height: 200px;
}

/* ================================================
   MOBILE-FIRST OPTIMIZATIONS
   ================================================ */

@media (max-width: 640px) {
    .course-card {
        padding: var(--space-4);
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ================================================
   DARK MODE SPECIFIC ENHANCEMENTS
   ================================================ */

[data-theme="dark"] .glass-card {
    background: rgba(30, 41, 59, 0.6);
}

[data-theme="dark"] .course-card {
    background: rgba(30, 41, 59, 0.6);
}

[data-theme="dark"] .btn-secondary {
    background: rgba(30, 41, 59, 0.6);
}

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, rgba(51, 65, 85, 0.8) 50%, var(--color-bg-tertiary) 75%);
    background-size: 200% 100%;
}