/* CSS Variables */
:root {
    --color-black: #000000;
    --color-tan: #86745c;
    --color-light-tan: #c2baab;
    --color-dark-tan: #6a5c48;
    --color-white: #ffffff;
    --color-overlay-63: rgba(0, 0, 0, 0.63);
    --color-overlay-80: rgba(0, 0, 0, 0.8);
    --color-overlay-88: rgba(0, 0, 0, 0.88);
    --color-accent: #b19977;
    
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-black);
    color: var(--color-light-tan);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
}

/* Animated Starfield Background */
.stars, .stars2 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.stars {
    background: transparent;
    box-shadow: 
        10px 10px 2px 0px rgba(255,255,255,0.3),
        50px 80px 2px 0px rgba(255,255,255,0.2),
        150px 30px 2px 0px rgba(255,255,255,0.3),
        200px 150px 2px 0px rgba(255,255,255,0.2),
        300px 50px 2px 0px rgba(255,255,255,0.3),
        350px 180px 2px 0px rgba(255,255,255,0.2),
        450px 90px 2px 0px rgba(255,255,255,0.3),
        550px 140px 2px 0px rgba(255,255,255,0.2),
        650px 70px 2px 0px rgba(255,255,255,0.3),
        750px 160px 2px 0px rgba(255,255,255,0.2),
        80px 200px 2px 0px rgba(255,255,255,0.3),
        180px 280px 2px 0px rgba(255,255,255,0.2),
        280px 220px 2px 0px rgba(255,255,255,0.3),
        380px 300px 2px 0px rgba(255,255,255,0.2),
        480px 240px 2px 0px rgba(255,255,255,0.3);
    animation: starsMove 120s linear infinite;
}

.stars2 {
    background: transparent;
    box-shadow: 
        30px 40px 2px 0px rgba(177,153,119,0.2),
        90px 100px 2px 0px rgba(177,153,119,0.2),
        190px 60px 2px 0px rgba(177,153,119,0.2),
        290px 120px 2px 0px rgba(177,153,119,0.2),
        390px 80px 2px 0px rgba(177,153,119,0.2),
        490px 140px 2px 0px rgba(177,153,119,0.2),
        590px 100px 2px 0px rgba(177,153,119,0.2),
        690px 160px 2px 0px rgba(177,153,119,0.2);
    animation: starsMove 180s linear infinite reverse;
}

@keyframes starsMove {
    0% { transform: translateY(0); }
    100% { transform: translateY(-100vh); }
}

/* Container - Mobile First */
.container {
    width: 100%;
    max-width: 100%;
    padding: 0 var(--spacing-sm);
    margin: 0 auto;
}

/* Tablet and up */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
        max-width: 1400px;
    }
}

/* Header - Mobile First */
header {
    position: relative;
    z-index: 100;
    padding: var(--spacing-md) 0;
    background: var(--color-overlay-80);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid var(--color-accent);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-accent);
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: 0 0 15px rgba(177, 153, 119, 0.5);
    line-height: 1.2;
}

.tagline {
    font-size: 0.75rem;
    color: var(--color-light-tan);
    font-weight: 300;
    letter-spacing: 0.5px;
}

/* Tablet and up */
@media (min-width: 768px) {
    header {
        padding: var(--spacing-lg) 0;
    }
    
    .logo {
        width: 60px;
        height: 60px;
    }
    
    .logo-container {
        gap: var(--spacing-md);
    }
    
    .logo-text h1 {
        font-size: 2rem;
        letter-spacing: 2px;
    }
    
    .tagline {
        font-size: 0.9rem;
    }
}

/* Main Content - Mobile First */
main {
    position: relative;
    z-index: 10;
    padding: var(--spacing-lg) 0;
}

@media (min-width: 768px) {
    main {
        padding: var(--spacing-xl) 0;
    }
}

/* Hero Section - Mobile First */
.hero-section {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 0.8s ease-out;
}

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

.hero-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 2px;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--color-tan);
    font-weight: 300;
    line-height: 1.6;
    padding: 0 var(--spacing-sm);
}

/* Tablet and up */
@media (min-width: 768px) {
    .hero-section {
        margin-bottom: var(--spacing-xl);
    }
    
    .hero-title {
        font-size: 2.2rem;
        letter-spacing: 3px;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .hero-title {
        font-size: 2.8rem;
    }
}

/* Card Grid - Mobile First (Stacked) */
.card-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Tablet - 2 columns */
@media (min-width: 768px) {
    .card-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
        margin-bottom: var(--spacing-xl);
    }
}

/* Desktop - 3 columns */
@media (min-width: 1024px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }
}

/* Extra large screens - still 3 columns for better readability */
@media (min-width: 1400px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Learning Cards - Mobile First */
.learning-card {
    background: var(--color-overlay-80);
    border: 2px solid var(--color-dark-tan);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-decoration: none;
    color: var(--color-light-tan);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s ease-out backwards;
}

.learning-card:nth-child(1) { animation-delay: 0.1s; }
.learning-card:nth-child(2) { animation-delay: 0.2s; }
.learning-card:nth-child(3) { animation-delay: 0.3s; }
.learning-card:nth-child(4) { animation-delay: 0.4s; }
.learning-card:nth-child(5) { animation-delay: 0.5s; }
.learning-card:nth-child(6) { animation-delay: 0.6s; }
.learning-card:nth-child(7) { animation-delay: 0.7s; }
.learning-card:nth-child(8) { animation-delay: 0.8s; }

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

.learning-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(177, 153, 119, 0.15), transparent);
    transition: left 0.6s;
}

.learning-card:active::before {
    left: 100%;
}

/* Hover effects for desktop */
@media (hover: hover) {
    .learning-card:hover {
        transform: translateY(-8px);
        border-color: var(--color-accent);
        box-shadow: 0 15px 40px rgba(177, 153, 119, 0.25);
    }
    
    .learning-card:hover::before {
        left: 100%;
    }
    
    .learning-card:hover .card-icon {
        transform: rotate(360deg) scale(1.1);
    }
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.card-icon {
    width: 60px;
    height: 60px;
    color: var(--color-accent);
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@media (min-width: 768px) {
    .card-icon {
        width: 70px;
        height: 70px;
    }
}

.card-badge {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-black);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

@media (min-width: 768px) {
    .card-badge {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
}

.learning-card h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    line-height: 1.3;
}

@media (min-width: 768px) {
    .learning-card h3 {
        font-size: 1.5rem;
        letter-spacing: 2px;
    }
}

.learning-card p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-light-tan);
    flex-grow: 1;
}

@media (min-width: 768px) {
    .learning-card p {
        font-size: 1.05rem;
    }
}

/* Info Section - Mobile First */
.info-section {
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.info-card {
    background: var(--color-overlay-63);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    backdrop-filter: blur(10px);
}

.info-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.info-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 1px;
}

.info-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-light-tan);
}

@media (min-width: 768px) {
    .info-icon {
        font-size: 3rem;
    }
    
    .info-card {
        padding: var(--spacing-xl);
    }
    
    .info-card h3 {
        font-size: 1.5rem;
    }
    
    .info-card p {
        font-size: 1.1rem;
        max-width: 800px;
        margin: 0 auto;
    }
}

/* Footer - Mobile First */
footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: var(--spacing-lg) 0;
    background: var(--color-overlay-88);
    border-top: 2px solid var(--color-dark-tan);
    color: var(--color-tan);
    font-size: 0.85rem;
    margin-top: var(--spacing-xl);
}

@media (min-width: 768px) {
    footer {
        font-size: 0.9rem;
    }
}

/* Page-Specific Styles */
.page-container {
    position: relative;
    z-index: 10;
    padding: var(--spacing-lg) 0;
}

@media (min-width: 768px) {
    .page-container {
        padding: var(--spacing-xl) 0;
    }
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 0.8s ease-out;
}

.page-header h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 2px;
    line-height: 1.3;
}

.page-header p {
    font-size: 1rem;
    color: var(--color-light-tan);
    line-height: 1.7;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .page-header {
        margin-bottom: var(--spacing-xl);
    }
    
    .page-header h2 {
        font-size: 2.5rem;
        letter-spacing: 3px;
    }
    
    .page-header p {
        font-size: 1.2rem;
        max-width: 800px;
        margin: 0 auto;
    }
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    padding: 0.8rem 1.5rem;
    background: var(--color-overlay-80);
    border: 2px solid var(--color-accent);
    border-radius: 8px;
    color: var(--color-accent);
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    touch-action: manipulation;
}

.back-button:active {
    background: var(--color-accent);
    color: var(--color-black);
    transform: scale(0.98);
}

@media (hover: hover) {
    .back-button:hover {
        background: var(--color-accent);
        color: var(--color-black);
        transform: translateX(-5px);
    }
}

.content-section {
    background: var(--color-overlay-80);
    border: 2px solid var(--color-dark-tan);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.8s ease-out backwards;
}

@media (min-width: 768px) {
    .content-section {
        padding: var(--spacing-xl);
        margin-bottom: var(--spacing-xl);
    }
}

.content-section h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

@media (min-width: 768px) {
    .content-section h3 {
        font-size: 1.8rem;
        letter-spacing: 2px;
    }
}

.content-section p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-light-tan);
    margin-bottom: var(--spacing-sm);
}

@media (min-width: 768px) {
    .content-section p {
        font-size: 1.1rem;
        line-height: 1.8;
    }
}

.interactive-area {
    background: var(--color-overlay-88);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
}

@media (min-width: 768px) {
    .interactive-area {
        padding: var(--spacing-xl);
        margin: var(--spacing-lg) 0;
    }
}

/* Buttons - Mobile First */
button {
    background: var(--color-accent);
    color: var(--color-black);
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    touch-action: manipulation;
    width: 100%;
}

@media (min-width: 768px) {
    button {
        width: auto;
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

button:active {
    transform: scale(0.98);
}

@media (hover: hover) {
    button:hover {
        background: var(--color-white);
        box-shadow: 0 8px 25px rgba(177, 153, 119, 0.35);
        transform: translateY(-2px);
    }
    
    button:active {
        transform: translateY(0);
    }
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }