/* ===================================
   CSS Variables & Color System
   =================================== */
:root {
    /* Colors */
    --sky-blue: #36C3F2;
    --ocean-deep: #1b3a52;
    --cloud-white: #F8F9FA;
    --wind-gray: #6B7280;
    --sunrise-gold: #FFB300;
    --sea-green: #10B981;
    --warm-beige: #F5EFE6;
    --coral: #F97316;

    /* Gradients */
    --gradient-sky: linear-gradient(135deg, #36C3F2 0%, #F5EFE6 100%);
    --gradient-ocean: linear-gradient(135deg, #1b3a52 0%, #36C3F2 100%);
    --gradient-sunset: linear-gradient(135deg, #FFB300 0%, #F97316 50%, #9333EA 100%);

    /* Typography */
    --font-heading: 'Baloo 2', cursive;
    --font-body: 'Montserrat', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Shadows - Papercraft style */
    --shadow-sm: 0 2px 8px rgba(27, 58, 82, 0.08);
    --shadow-md: 0 4px 16px rgba(27, 58, 82, 0.12);
    --shadow-lg: 0 10px 24px rgba(27, 58, 82, 0.15);
    --shadow-xl: 0 20px 40px rgba(27, 58, 82, 0.2);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--ocean-deep);
    background-color: var(--warm-beige);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Paper texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(27, 58, 82, 0.02) 2px, rgba(27, 58, 82, 0.02) 4px);
    pointer-events: none;
    z-index: 9999;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--sky-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--sunrise-gold);
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: 1rem;
    max-width: 75ch;
}

strong {
    color: var(--ocean-deep);
    font-weight: 700;
}

em {
    color: var(--sky-blue);
    font-style: italic;
}

/* ===================================
   Utility Classes
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    color: var(--ocean-deep);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--wind-gray);
    font-weight: 500;
}

.section-dark {
    background: var(--gradient-ocean);
    color: var(--cloud-white);
}

.section-dark .section-title,
.section-dark h3,
.section-dark h4 {
    color: var(--cloud-white);
}

.section-dark p {
    color: rgba(255, 255, 255, 0.9);
}

.section-highlight {
    background: linear-gradient(135deg, #F5EFE6 0%, #E8F4F8 100%);
}

.section-facts {
    background: var(--gradient-sky);
}

/* ===================================
   Navigation
   =================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-medium);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--ocean-deep);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-link {
    color: var(--wind-gray);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--sky-blue);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-sky);
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.cloud {
    position: absolute;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 100px;
    animation: float 20s ease-in-out infinite;
}

.cloud-1 {
    width: 200px;
    height: 60px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.cloud-2 {
    width: 300px;
    height: 80px;
    top: 50%;
    right: 15%;
    animation-delay: 3s;
}

.cloud-3 {
    width: 150px;
    height: 50px;
    bottom: 30%;
    left: 20%;
    animation-delay: 6s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1200px;
    padding: 0 2rem;
}

.hero-text {
    animation: fadeInUp 1s ease;
}

.hero-title {
    color: var(--ocean-deep);
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--sunrise-gold);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--wind-gray);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--sky-blue);
    color: white;
    font-weight: 700;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-medium);
    font-size: 1.125rem;
}

.hero-button:hover {
    background: var(--ocean-deep);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.arrow {
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(5px);
    }
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.albatross-illustration {
    width: 100%;
    max-width: 400px;
}

.albatross-svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(var(--shadow-md));
}

.albatross-group {
    animation: soar 6s ease-in-out infinite;
}

@keyframes soar {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(10px, -10px) rotate(-2deg);
    }
    50% {
        transform: translate(0, -5px) rotate(0deg);
    }
    75% {
        transform: translate(-10px, -10px) rotate(2deg);
    }
}

.wind-lines line {
    animation: windFlow 3s linear infinite;
}

@keyframes windFlow {
    0% {
        stroke-dashoffset: 0;
        opacity: 0.3;
    }
    50% {
        opacity: 0.6;
    }
    100% {
        stroke-dashoffset: 100;
        opacity: 0.3;
    }
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--wind-gray);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--wind-gray);
    border-bottom: 2px solid var(--wind-gray);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    50% {
        transform: rotate(45deg) translateY(10px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Content Grid
   =================================== */
.content-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: start;
}

.content-text {
    font-size: 1.125rem;
}

.intro-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--ocean-deep);
    margin-bottom: 1.5rem;
}

.highlight-box {
    background: rgba(54, 195, 242, 0.1);
    border-left: 4px solid var(--sky-blue);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-top: 2rem;
}

.highlight-box h3 {
    color: var(--sky-blue);
    margin-bottom: 0.5rem;
}

/* ===================================
   Stat Cards
   =================================== */
.content-visual {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-sunset);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--sky-blue);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 1rem;
    font-weight: 700;
    color: var(--wind-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.stat-description {
    font-size: 0.875rem;
    color: var(--wind-gray);
}

/* ===================================
   Physics Section
   =================================== */
.physics-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.physics-text h3 {
    color: var(--sunrise-gold);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.physics-text h3:first-child {
    margin-top: 0;
}

.physics-formula {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-top: 2rem;
}

.physics-formula h4 {
    color: var(--sunrise-gold);
    margin-bottom: 0.75rem;
}

.wind-gradient-diagram {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.wind-gradient-diagram svg {
    width: 100%;
    height: auto;
}

/* ===================================
   Flight Cycle Section
   =================================== */
.cycle-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.125rem;
}

.cycle-diagram {
    margin-bottom: 3rem;
}

.cycle-center {
    display: none;
}

.cycle-arrows {
    width: 100%;
    height: 100%;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.phase-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    position: relative;
    z-index: 1;
    align-items: stretch;
}

.phase-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.phase-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
}

.phase-1::before {
    background: linear-gradient(90deg, #10B981, #34D399);
}

.phase-2::before {
    background: linear-gradient(90deg, #36C3F2, #60D5F8);
}

.phase-3::before {
    background: linear-gradient(90deg, #FFB300, #FFC942);
}

.phase-4::before {
    background: linear-gradient(90deg, #F97316, #FB923C);
}

.phase-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.phase-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

.phase-icon svg {
    width: 100%;
    height: 100%;
}

.phase-title {
    color: var(--ocean-deep);
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.phase-subtitle {
    text-align: center;
    color: var(--sky-blue);
    font-weight: 600;
    margin-bottom: 1rem;
}

.phase-description {
    color: var(--wind-gray);
    margin-bottom: 1.5rem;
    text-align: center;
    flex-grow: 1;
}

.phase-stats {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: auto;
}

.stat-item {
    background: var(--warm-beige);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--ocean-deep);
    flex: 1;
    min-width: 120px;
    text-align: center;
    white-space: nowrap;
}

.cycle-note {
    background: linear-gradient(135deg, #36C3F2 0%, #10B981 100%);
    padding: 2rem;
    border-radius: var(--radius-lg);
    color: white;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.cycle-note h3 {
    color: white;
    margin-bottom: 1rem;
}

.cycle-note p {
    font-size: 1.125rem;
    max-width: 800px;
    margin: 0 auto;
}

/* ===================================
   Lessons Section
   =================================== */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.lesson-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--gradient-sunset);
}

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

.lesson-number {
    display: inline-block;
    font-size: 3rem;
    font-weight: 800;
    color: rgba(54, 195, 242, 0.2);
    font-family: var(--font-heading);
    margin-bottom: 1rem;
}

.lesson-card h3 {
    color: var(--ocean-deep);
    margin-bottom: 1rem;
}

.lesson-card p {
    color: var(--wind-gray);
}

/* RC Glider Section */
.rc-glider-section {
    background: white;
    padding: 3rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
}

.rc-glider-section h3 {
    color: var(--ocean-deep);
    text-align: center;
    margin-bottom: 2rem;
}

.rc-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: center;
}

.rc-achievements {
    list-style: none;
    padding: 0;
}

.rc-achievements li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--wind-gray);
    font-size: 1.125rem;
}

.rc-achievements li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--sea-green);
    font-weight: bold;
    font-size: 1.5rem;
}

.speed-display {
    background: var(--gradient-sunset);
    padding: 3rem;
    border-radius: var(--radius-lg);
    text-align: center;
    color: white;
    box-shadow: var(--shadow-xl);
}

.speed-number {
    font-size: 5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    line-height: 1;
}

.speed-unit {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.speed-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* Safety Note */
.safety-note {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-left: 4px solid #F59E0B;
    padding: 1.5rem;
    border-radius: var(--radius-md);
}

.safety-note h4 {
    color: #92400E;
    margin-bottom: 0.75rem;
}

.safety-note p {
    color: #78350F;
    margin: 0;
}

/* ===================================
   Applications Section
   =================================== */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.app-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-medium);
    text-align: center;
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.app-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.app-card h3 {
    color: var(--ocean-deep);
    margin-bottom: 1rem;
}

.app-card p {
    color: var(--wind-gray);
    margin-bottom: 1.5rem;
}

.app-benefit {
    display: inline-block;
    background: var(--gradient-sky);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
}

.future-vision {
    background: var(--gradient-ocean);
    color: white;
    padding: 3rem;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.future-vision h3 {
    color: var(--sunrise-gold);
    margin-bottom: 1.5rem;
}

.future-vision p {
    font-size: 1.125rem;
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto;
}

/* ===================================
   Facts Section
   =================================== */
.facts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.fact-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-medium);
    text-align: center;
}

.fact-card:hover {
    transform: translateY(-8px) rotate(2deg);
    box-shadow: var(--shadow-xl);
}

.fact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.fact-card h3 {
    color: var(--ocean-deep);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.fact-card p {
    color: var(--wind-gray);
    font-size: 0.95rem;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--ocean-deep);
    color: rgba(255, 255, 255, 0.9);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
    align-items: start;
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-section h3 {
    color: var(--sunrise-gold);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.footer-section p {
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 0;
}

.resource-list {
    list-style: none;
    padding: 0;
}

.resource-list li {
    margin-bottom: 0.75rem;
}

.resource-list a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
    font-size: 0.95rem;
}

.resource-list a:hover {
    color: var(--sunrise-gold);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-bottom p {
    margin: 0.5rem auto;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    max-width: 100%;
}

.footer-note {
    font-size: 0.8rem !important;
}

/* ===================================
   Responsive Design
   =================================== */

/* Large Tablets and Small Desktops */
@media (max-width: 1280px) {
    .phase-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Tablets (Portrait) */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-visual {
        order: 1;
    }

    .content-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .physics-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .lessons-grid {
        grid-template-columns: 1fr;
    }

    .rc-content {
        grid-template-columns: 1fr;
    }

    .applications-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-container {
        padding: 1rem;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.85rem;
    }

    .hero {
        min-height: auto;
        padding: 6rem 1rem 4rem;
    }

    .hero-content {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .container {
        padding: 0 1rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .cycle-center {
        width: 150px;
        height: 150px;
    }

    .phase-cards {
        grid-template-columns: 1fr;
    }

    .phase-icon {
        width: 60px;
        height: 60px;
    }

    .speed-number {
        font-size: 3.5rem;
    }

    .facts-grid {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }
}

/* Extra Small Mobile */
@media (max-width: 480px) {
    .nav-menu {
        display: none;
    }

    .hero-button {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }

    .phase-cards {
        gap: 1.5rem;
    }

    .lesson-number {
        font-size: 2rem;
    }

    .rc-glider-section,
    .future-vision {
        padding: 2rem 1.5rem;
    }
}

/* ===================================
   Animations & Effects
   =================================== */

/* Fade in on scroll */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Pulse animation for emphasis */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .nav,
    .scroll-indicator,
    .hero-button {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}