/* ============================================
   MEDIA-ISM - Main Stylesheet
   Dark & Minimal Design System
   ============================================ */

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

:root {
    /* Colors */
    --color-bg-primary: #000000;
    --color-bg-secondary: #111111;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-footer: #0d0d0d;
    
    --color-primary: #00bfa5;
    --color-primary-hover: #26c6da;
    --color-secondary: #fdd835;
    
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #9e9e9e;
    --color-text-light: #ffffff;
    
    --color-border: #333333;
    --color-border-hover: var(--color-primary);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-korean: 'Pretendard', 'Noto Sans KR', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 70px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2rem;
    font-weight: 700;
}

h2 {
    font-size: 1.5rem;
}

h3 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

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

a:hover {
    color: var(--color-primary-hover);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

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

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-bg-primary);
}

.btn-secondary:hover {
    background-color: #ffeb3b;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Header */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}
#header .container{height: 100%;}
.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--color-text-primary);
    font-weight: 500;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.cta-btn {
    margin-left: var(--spacing-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
}

/* Main Content */
#app {
    min-height: calc(100vh - var(--header-height));
    /* margin-top: var(--header-height); */
    padding: var(--spacing-2xl) 0;
}

/* Footer */
#footer {
    background-color: var(--color-bg-footer);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    color: var(--color-text-secondary);
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.footer-logo-img {
    height: 32px;
    width: auto;
    object-fit: contain;
}

.footer-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-section p {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--color-text-secondary);
}

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

.footer-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-download-btn svg {
    flex-shrink: 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-link {
    color: var(--color-text-secondary);
}

.footer-link:hover {
    color: var(--color-primary);
}

/* Floating Buttons */
.floating-buttons {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 999;
}

.floating-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    background-color: var(--color-primary);
    color: var(--color-text-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 191, 165, 0.4);
    transition: all var(--transition-normal);
}

.floating-btn:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0, 191, 165, 0.6);
}

.scroll-top-btn {
    opacity: 0;
    pointer-events: none;
}

.scroll-top-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

/* Card Components */
.card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--color-border-hover);
    transform: scale(1.02);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.card-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Section Spacing */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-light);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    font-size: 1.125rem;
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    color: var(--color-text-secondary);
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-bg-secondary);
        transition: left var(--transition-normal);
        padding: var(--spacing-lg);
    }

    .nav.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

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

    .cta-btn {
        display: none;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }

    .floating-buttons {
        bottom: 1rem;
        right: 1rem;
    }

    .floating-btn {
        width: 48px;
        height: 48px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}