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

:root {
    /* Purple Color Palette */
    --primary-purple: #7B2CBF;
    --primary-purple-dark: #5A189A;
    --primary-purple-light: #9D4EDD;
    --secondary-purple: #C77DFF;
    --accent-purple: #E0AAFF;
    --light-purple: #F3E5F5;
    --very-light-purple: #FAF5FF;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --black: #1A1A1A;
    --gray-dark: #333333;
    --gray: #666666;
    --gray-light: #999999;
    --gray-lighter: #E5E5E5;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #7B2CBF 0%, #9D4EDD 100%);
    --gradient-secondary: linear-gradient(135deg, #C77DFF 0%, #E0AAFF 100%);
    --gradient-hero: linear-gradient(135deg, #7B2CBF 0%, #9D4EDD 50%, #C77DFF 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Typography */
    --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    --font-size-4xl: 64px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(123, 44, 191, 0.1);
    --shadow-md: 0 4px 12px rgba(123, 44, 191, 0.15);
    --shadow-lg: 0 8px 24px rgba(123, 44, 191, 0.2);
    --shadow-xl: 0 16px 48px rgba(123, 44, 191, 0.25);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-dark);
    background-color: var(--white);
    overflow-x: hidden;
    /* Font loading optimization */
    font-display: swap;
}

/* Loading state */
body.loading {
    overflow: hidden;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--light-purple);
    border-top-color: var(--primary-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
    will-change: box-shadow;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-purple);
    text-decoration: none;
}

.logo-icon {
    font-size: 28px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--gray-dark);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

.nav-menu a:hover {
    color: var(--primary-purple);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a.active {
    color: var(--primary-purple);
    font-weight: 600;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle .hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--primary-purple);
    transition: var(--transition-base);
    display: block;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
    margin-top: 70px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.1;
    z-index: -1;
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 800px;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--black);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-purple);
    border: 2px solid var(--primary-purple);
}

.btn-secondary:hover {
    background: var(--primary-purple);
    color: var(--white);
    transform: translateY(-2px);
}

/* Download Buttons */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
    min-width: 160px;
    justify-content: center;
}

.btn-google-play {
    background: linear-gradient(135deg, #4285F4 0%, #34A853 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-google-play:hover {
    background: linear-gradient(135deg, #357AE8 0%, #2E8B47 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-app-store {
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-app-store:hover {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.hero-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: var(--gradient-secondary);
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    left: 50%;
    animation-delay: 10s;
}

/* Section Styles */
.section {
    padding: var(--spacing-xl) 0;
}

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

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray);
}

/* Purpose Section */
.purpose {
    background: var(--very-light-purple);
}

.purpose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.purpose-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

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

.purpose-card,
.admin-card {
    will-change: transform;
}

.card-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

.purpose-card h3 {
    font-size: var(--font-size-xl);
    color: var(--primary-purple);
    margin-bottom: var(--spacing-sm);
}

.purpose-card p {
    color: var(--gray);
    line-height: 1.8;
}

/* App Features Section */
.app-features {
    background: var(--white);
}

.features-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.feature-item.reverse {
    direction: rtl;
}

.feature-item.reverse > * {
    direction: ltr;
}

.feature-image {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

.feature-icon-large {
    font-size: 120px;
    opacity: 0.8;
}

.feature-content h3 {
    font-size: var(--font-size-2xl);
    color: var(--primary-purple);
    margin-bottom: var(--spacing-md);
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.feature-list li {
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--gray-dark);
    line-height: 1.8;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-purple);
    font-weight: bold;
}

/* Admin Features Section */
.admin-features {
    background: var(--very-light-purple);
}

.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.admin-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    border: 2px solid transparent;
}

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

.admin-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--light-purple);
}

.admin-icon {
    font-size: 32px;
}

.admin-card-header h3 {
    font-size: var(--font-size-xl);
    color: var(--primary-purple);
}

.admin-card-body ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.admin-card-body li {
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--gray-dark);
    line-height: 1.8;
}

.admin-card-body li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-purple);
    font-weight: bold;
    font-size: 20px;
}

/* Scoreboard Section */
.scoreboard {
    background: var(--white);
}

.scoreboard-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.scoreboard-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.scoreboard-feature {
    text-align: center;
    padding: var(--spacing-md);
}

.scoreboard-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

.scoreboard-feature h3 {
    font-size: var(--font-size-lg);
    color: var(--primary-purple);
    margin-bottom: var(--spacing-xs);
}

.scoreboard-feature p {
    color: var(--gray);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.scoreboard-demo {
    display: flex;
    justify-content: center;
}

.demo-card {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    color: var(--white);
    min-width: 300px;
    box-shadow: var(--shadow-xl);
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.demo-court {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.demo-status {
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.demo-score {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin: var(--spacing-md) 0;
}

.demo-team {
    text-align: center;
}

.team-name {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin-bottom: var(--spacing-xs);
}

.team-score {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    transition: transform 0.15s ease;
    display: inline-block;
}

.demo-vs {
    font-size: var(--font-size-lg);
    opacity: 0.7;
}

.demo-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* Footer */
.footer {
    background: var(--gray-dark);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--accent-purple);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--gray-lighter);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent-purple);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-light);
}

.footer-description {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--gray-lighter);
}

.footer-description strong {
    color: var(--accent-purple);
    font-weight: 600;
}

.footer-bottom a {
    color: var(--gray-lighter);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
}

.footer-bottom a:hover {
    color: var(--accent-purple);
    text-decoration: underline;
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .feature-item,
    .feature-item.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .feature-icon-large {
        font-size: 80px;
    }

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

    .scoreboard-features {
        grid-template-columns: 1fr;
    }

    .purpose-grid,
    .admin-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-xl);
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .demo-card {
        min-width: auto;
        width: 100%;
    }

    .team-score {
        font-size: var(--font-size-2xl);
    }

    .footer-description {
        font-size: var(--font-size-sm);
        padding: 0 var(--spacing-sm);
    }

    .scroll-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Skip to main content (accessibility) */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-purple);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 4px 0;
}

.skip-to-main:focus {
    top: 0;
}

/* Mobile menu hamburger animation */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Selection */
::selection {
    background: var(--accent-purple);
    color: var(--white);
}

/* Focus styles for accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--primary-purple);
    outline-offset: 2px;
}

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

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

.scroll-to-top:focus {
    outline: 2px solid var(--primary-purple);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar,
    .hero-shapes,
    .hero-buttons,
    .mobile-menu-toggle,
    .footer {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .section {
        page-break-inside: avoid;
    }
}