/**
 * Course Design System - Components
 * ==================================
 * Reusable UI components for all courses
 */

/* ═══════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: inherit;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    line-height: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

/* Primary Button */
.btn-primary,
.btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px var(--primary-glow),
        0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover,
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow),
        0 4px 10px rgba(0, 0, 0, 0.15);
}

.btn-primary:active,
.btn:active {
    transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 2px solid var(--border-card);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Success Button */
.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.5);
}

/* ═══════════════════════════════════════════════════
   CARDS
   ═══════════════════════════════════════════════════ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    border: 1px solid var(--border-card);
    transition: var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--primary-light);
}

/* Icon Card */
.icon-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 1.75rem;
    text-align: center;
    border: 1px solid var(--border-card);
    cursor: pointer;
    transition: var(--transition-spring);
}

.icon-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 20px 40px -15px var(--primary-glow),
        0 0 0 2px var(--primary-light);
    border-color: transparent;
}

.icon-card i {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.icon-card h3 {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.icon-card p {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ═══════════════════════════════════════════════════
   HIGHLIGHT BOXES
   ═══════════════════════════════════════════════════ */
.highlight-box {
    background: linear-gradient(135deg, #eff6ff 0%, #f0f9ff 100%);
    border-left: 4px solid var(--primary);
    padding: var(--space-lg);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    margin: var(--space-lg) 0;
}

.highlight-box.warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);
    border-left-color: var(--warning);
}

.highlight-box.success {
    background: linear-gradient(135deg, #d1fae5 0%, #ecfdf5 100%);
    border-left-color: var(--success);
}

.highlight-box.danger {
    background: linear-gradient(135deg, #fee2e2 0%, #fef2f2 100%);
    border-left-color: var(--danger);
}

.highlight-box.info {
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
    border-left-color: var(--info);
}

/* ═══════════════════════════════════════════════════
   QUIZ
   ═══════════════════════════════════════════════════ */
.quiz-option {
    background: var(--bg-card);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-md) 0;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    border: 2px solid var(--border-card);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.quiz-option:hover:not(.disabled) {
    border-color: var(--primary);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.quiz-option .option-letter {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.quiz-option:hover:not(.disabled) .option-letter {
    background: var(--primary);
    color: var(--text-inverse);
}

.quiz-option .option-text {
    flex: 1;
}

/* Correct Answer */
.quiz-option.selected.correct {
    background: linear-gradient(135deg, #d1fae5 0%, #ecfdf5 100%);
    border-color: var(--success);
    color: #065f46;
}

.quiz-option.selected.correct .option-letter {
    background: var(--success);
    color: var(--text-inverse);
}

/* Incorrect Answer */
.quiz-option.selected.incorrect {
    background: linear-gradient(135deg, #fee2e2 0%, #fef2f2 100%);
    border-color: var(--danger);
    color: #991b1b;
}

.quiz-option.selected.incorrect .option-letter {
    background: var(--danger);
    color: var(--text-inverse);
}

/* Disabled state */
.quiz-option.disabled {
    pointer-events: none;
    opacity: 0.8;
}

/* Explanation */
.quiz-explanation {
    display: none;
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    background: linear-gradient(135deg, #eff6ff 0%, #f0f9ff 100%);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
    animation: fadeIn 0.5s ease;
}

.quiz-explanation h4 {
    font-weight: var(--font-weight-bold);
    color: var(--primary);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-lg);
}

.quiz-explanation.show {
    display: block;
}

/* ═══════════════════════════════════════════════════
   TABLES
   ═══════════════════════════════════════════════════ */
.table-responsive {
    overflow-x: auto;
    margin: var(--space-lg) 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

th,
td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--border-card);
}

th {
    background: var(--primary);
    color: var(--text-inverse);
    font-weight: var(--font-weight-semibold);
}

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

tr:last-child td {
    border-bottom: none;
}

/* ═══════════════════════════════════════════════════
   LISTS
   ═══════════════════════════════════════════════════ */
.list-styled {
    margin: var(--space-md) 0;
    padding-left: var(--space-lg);
}

.list-styled li {
    margin-bottom: var(--space-sm);
    line-height: var(--line-height-relaxed);
}

.list-styled li::marker {
    color: var(--primary);
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE ADJUSTMENTS
   ═══════════════════════════════════════════════════ */
@media (max-width: 768px) {
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: var(--font-size-sm);
        width: 100%;
        justify-content: center;
    }

    .icon-card {
        padding: var(--space-md);
    }

    .icon-card i {
        font-size: 2rem;
    }

    .quiz-option {
        padding: var(--space-md);
    }
}

/* ═══════════════════════════════════════════════════
   GLASSMORPHISM CARDS
   ═══════════════════════════════════════════════════ */
.glass-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: var(--transition-spring);
}

.glass-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    border-color: rgba(255, 255, 255, 0.4);
}

/* ═══════════════════════════════════════════════════
   GRADIENT CARDS
   ═══════════════════════════════════════════════════ */
.gradient-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
    transition: var(--transition-spring);
}

.gradient-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    transition: var(--transition-slow);
}

.gradient-card:hover::before {
    transform: scale(1.5);
}

.gradient-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* ═══════════════════════════════════════════════════
   FLIP CARDS
   ═══════════════════════════════════════════════════ */
.flip-card {
    perspective: 1000px;
    height: 200px;
    cursor: pointer;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner,
.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    text-align: center;
}

.flip-card-front {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.flip-card-back {
    background: var(--bg-card);
    border: 2px solid var(--primary);
    transform: rotateY(180deg);
}

/* ═══════════════════════════════════════════════════
   ANIMATED ICONS
   ═══════════════════════════════════════════════════ */
.icon-bounce {
    animation: iconBounce 2s ease-in-out infinite;
}

@keyframes iconBounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

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

@keyframes iconPulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.icon-glow {
    filter: drop-shadow(0 0 10px var(--primary));
    animation: iconGlow 2s ease-in-out infinite alternate;
}

@keyframes iconGlow {
    from {
        filter: drop-shadow(0 0 5px var(--primary));
    }

    to {
        filter: drop-shadow(0 0 20px var(--primary));
    }
}

/* ═══════════════════════════════════════════════════
   STAGGERED ANIMATIONS
   ═══════════════════════════════════════════════════ */
.stagger-container>* {
    opacity: 0;
    animation: staggerFadeIn 0.5s ease forwards;
}

.stagger-container>*:nth-child(1) {
    animation-delay: 0.1s;
}

.stagger-container>*:nth-child(2) {
    animation-delay: 0.2s;
}

.stagger-container>*:nth-child(3) {
    animation-delay: 0.3s;
}

.stagger-container>*:nth-child(4) {
    animation-delay: 0.4s;
}

.stagger-container>*:nth-child(5) {
    animation-delay: 0.5s;
}

.stagger-container>*:nth-child(6) {
    animation-delay: 0.6s;
}

@keyframes staggerFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ═══════════════════════════════════════════════════
   CONFETTI ANIMATION
   ═══════════════════════════════════════════════════ */
.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    animation: confettiFall 3s linear forwards;
}

@keyframes confettiFall {
    0% {
        transform: translateY(-100%) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ═══════════════════════════════════════════════════
   SHAKE ANIMATION
   ═══════════════════════════════════════════════════ */
.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

/* ═══════════════════════════════════════════════════
   TOOLTIP
   ═══════════════════════════════════════════════════ */
.tooltip-container {
    position: relative;
    display: inline-block;
}

.tooltip-content {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--gray-900);
    color: white;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    z-index: 100;
    transition: all 0.3s ease;
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--gray-900);
}

.tooltip-container:hover .tooltip-content {
    visibility: visible;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ═══════════════════════════════════════════════════
   PROGRESS RING
   ═══════════════════════════════════════════════════ */
.progress-ring {
    width: 120px;
    height: 120px;
    position: relative;
}

.progress-ring circle {
    fill: none;
    stroke-width: 8;
    stroke-linecap: round;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
}

.progress-ring .bg {
    stroke: var(--gray-200);
}

.progress-ring .progress {
    stroke: var(--primary);
    stroke-dasharray: 314;
    stroke-dashoffset: 314;
    transition: stroke-dashoffset 1s ease;
}

/* ═══════════════════════════════════════════════════
   EXPANDABLE SECTION
   ═══════════════════════════════════════════════════ */
.expandable {
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--space-md) 0;
}

.expandable-header {
    background: var(--bg-card);
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.expandable-header:hover {
    background: var(--bg-card-hover);
}

.expandable-header i {
    transition: transform 0.3s ease;
}

.expandable.open .expandable-header i {
    transform: rotate(180deg);
}

.expandable-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    background: var(--bg-page);
}

.expandable.open .expandable-content {
    max-height: 500px;
}

.expandable-content-inner {
    padding: var(--space-lg);
}

/* ═══════════════════════════════════════════════════
   BADGE
   ═══════════════════════════════════════════════════ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.badge-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.badge-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    color: white;
}

.badge-warning {
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
}

.badge-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #b91c1c 100%);
    color: white;
}

/* ═══════════════════════════════════════════════════
   FLOATING ELEMENTS
   ═══════════════════════════════════════════════════ */
.float-slow {
    animation: floatSlow 6s ease-in-out infinite;
}

@keyframes floatSlow {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-15px);
    }
}

.float-medium {
    animation: floatMedium 4s ease-in-out infinite;
}

@keyframes floatMedium {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* ═══════════════════════════════════════════════════
   INTERACTIVE TIMELINE
   ═══════════════════════════════════════════════════ */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-lg);
    opacity: 0;
    animation: timelineSlide 0.5s ease forwards;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 5px;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-page);
    box-shadow: 0 0 0 3px var(--primary-light);
}

@keyframes timelineSlide {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.timeline-item:nth-child(1) {
    animation-delay: 0.1s;
}

.timeline-item:nth-child(2) {
    animation-delay: 0.2s;
}

.timeline-item:nth-child(3) {
    animation-delay: 0.3s;
}

.timeline-item:nth-child(4) {
    animation-delay: 0.4s;
}

.timeline-item:nth-child(5) {
    animation-delay: 0.5s;
}