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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%,
    100% {
        transform: translateY(0) rotate(5deg);
    }
    25% {
        transform: translateY(-20px) rotate(-5deg);
    }
    50% {
        transform: translateY(0) rotate(5deg);
    }
    75% {
        transform: translateY(-10px) rotate(-5deg);
    }
}

@keyframes floatReverse {
    0%,
    100% {
        transform: translateY(0) rotate(-5deg);
    }
    25% {
        transform: translateY(-10px) rotate(5deg);
    }
    50% {
        transform: translateY(0) rotate(-5deg);
    }
    75% {
        transform: translateY(-20px) rotate(5deg);
    }
}

.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

/* Floating Stickers */
.floating-sticker {
    position: absolute;
    width: 100px;
    height: 100px;
    opacity: 0.6;
    z-index: 1;
    pointer-events: none;
    object-fit: contain;
}

/* Left side stickers */
.left-sticker {
    left: 2%;
    top: 10%;
    animation: float 6s ease-in-out infinite;
}

.sticker-3 {
    left: 5%;
    top: 40%;
    animation: float 7s ease-in-out infinite;
    animation-delay: 2s;
    width: 90px;
    height: 90px;
}

.sticker-5 {
    left: 3%;
    top: 70%;
    animation: float 8s ease-in-out infinite;
    animation-delay: 1.5s;
    width: 85px;
    height: 85px;
}

/* Right side stickers */
.right-sticker {
    right: 2%;
    top: 20%;
    animation: floatReverse 8s ease-in-out infinite;
    animation-delay: 1s;
}

.sticker-4 {
    right: 5%;
    top: 50%;
    animation: floatReverse 6.5s ease-in-out infinite;
    animation-delay: 0.5s;
    width: 95px;
    height: 95px;
}

.sticker-6 {
    right: 3%;
    top: 75%;
    animation: floatReverse 7.5s ease-in-out infinite;
    animation-delay: 3s;
    width: 88px;
    height: 88px;
}

/* Desktop only - ensure stickers stay on sides */
@media (min-width: 1280px) {
    .left-sticker,
    .sticker-3,
    .sticker-5 {
        left: calc(50% - 650px);
    }

    .right-sticker,
    .sticker-4,
    .sticker-6 {
        right: calc(50% - 650px);
    }
}

/* Tablet */
@media (max-width: 1024px) {
    .floating-sticker {
        width: 70px;
        height: 70px;
        opacity: 0.5;
    }

    .sticker-3,
    .sticker-4,
    .sticker-5,
    .sticker-6 {
        width: 65px;
        height: 65px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .floating-sticker {
        display: none; /* Hide all stickers on mobile for better readability */
    }
}

/* Mobile Menu */
.mobile-menu {
    display: none;
}

.mobile-menu.active {
    display: block;
}

/* Hero Section */
.hero-section {
    background-attachment: fixed;
    position: relative;
}

.hero-content {
    animation: slideUp 1s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero title fade-in animation */
.hero-section h1 {
    animation: titleFadeIn 2s ease-out forwards;
}

@keyframes titleFadeIn {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile adjustments for hero */
@media (max-width: 768px) {
    .hero-content {
        margin: 2rem 1rem;
        padding: 2rem 1.5rem;
    }

    .hero-section {
        background-attachment: scroll; /* Fix mobile background */
    }
}

/* Card Hover Effects */
.hover-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Scroll Snap for Mobile */
@media (max-width: 768px) {
    .snap-x {
        scroll-snap-type: x mandatory;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .snap-x > * {
        scroll-snap-align: start;
        flex-shrink: 0;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Button Animations */
.btn-primary {
    position: relative;
    overflow: hidden;
}

.btn-normal {
    background-color: #2e6ff2;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-normal:hover {
    background-color: #1e4fd2;
}

.btn-wh {
    background-color: #fff;
    border: solid 2px #2e6ff2;
    color: #2e6ff2;
}

.btn-wh:hover {
    background-color: #2e6ff2;
    color: #fff;
}

.btn-primary::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Loading Animation */
@keyframes pulse {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Backdrop Blur Fallback */
@supports not (backdrop-filter: blur(10px)) {
    .backdrop-blur {
        background-color: rgba(255, 255, 255, 0.95);
    }
}

/* Responsive Images */
img {
    max-width: 100%;
    height: auto;
}

/* Focus Styles */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    header,
    footer,
    .no-print {
        display: none;
    }

    body {
        font-size: 12pt;
    }
}

/* Smooth Transitions */
* {
    transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

/* Section Spacing */
section {
    position: relative;
    overflow: hidden;
}

/* Background Patterns */
.pattern-dots {
    background-image: radial-gradient(circle, #e5e7eb 1px, transparent 1px);
    background-size: 20px 20px;
}

.pattern-grid {
    background-image: linear-gradient(rgba(229, 231, 235, 0.5) 1px, transparent 1px), linear-gradient(90deg, rgba(229, 231, 235, 0.5) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Code Block Styles */
code {
    font-family: "Courier New", Courier, monospace;
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Responsive Typography */
@media (max-width: 640px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.5rem;
    }
}

/* Instructor Card Animation */
.instructor-card {
    transition: transform 0.3s ease;
}

.instructor-card:hover {
    transform: scale(1.05);
}

/* Timeline Styles */
.timeline-item {
    position: relative;
    padding-left: 2rem;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 12px;
    height: 12px;
    background: #3b82f6;
    border-radius: 50%;
    transform: translateY(-50%);
}

/* Glassmorphism Effect */
.glass {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* Dark Mode Support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1a1a;
        --text-primary: #ffffff;
    }
}

/* Mobile-First Responsive Utilities */
.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 640px) {
    .container {
        max-width: 640px;
    }
}

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

@media (min-width: 1024px) {
    .container {
        max-width: 1024px;
    }
}

@media (min-width: 1280px) {
    .container {
        max-width: 1280px;
    }
}