/* ========================================
   크루와 공통 스타일
   ======================================== */

/* CSS Variables - 앱 테마와 통일 */
:root {
    --primary: #222222;
    --primary-dark: #000000;
    --secondary: #555555;
    --text-primary: #222222;
    --text-secondary: #666666;
    --text-muted: #999999;
    --bg-light: #F5F5F5;
    --bg-white: #FFFFFF;
    --bg-dark: #222222;
    --border-color: #EEEEEE;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 16px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 140px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.4rem;
    opacity: 0.95;
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

/* Page Header (for subpages) */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 120px 0 60px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.page-header p {
    font-size: 1.15rem;
    opacity: 0.9;
}

/* ========================================
   Sections
   ======================================== */
section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-top: -48px;
    margin-bottom: 60px;
}

/* Light/Dark section backgrounds */
.section-light {
    background: var(--bg-light);
}

.section-white {
    background: var(--bg-white);
}

/* ========================================
   Feature Cards
   ======================================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   Content Cards (for notices, etc.)
   ======================================== */
.content-card {
    display: block;
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    color: inherit;
    max-width: 800px;
    margin: 0 auto;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.content-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.content-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.read-more {
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ========================================
   About Section
   ======================================== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 24px;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    text-align: center;
}

.contact-section h2 {
    color: white;
    margin-bottom: 24px;
}

.contact-section p {
    font-size: 1.15rem;
    margin-bottom: 12px;
    opacity: 0.95;
}

.contact-section a {
    color: white;
    text-decoration: none;
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
    transition: var(--transition);
    font-weight: 500;
}

.contact-section a:hover {
    border-bottom-color: white;
}

/* ========================================
   Document Content (terms, privacy, etc.)
   ======================================== */
.document-content {
    background: var(--bg-white);
    margin: -40px auto 60px;
    padding: 60px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    position: relative;
    z-index: 10;
}

.document-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 48px;
    margin-bottom: 20px;
    color: var(--primary);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
}

.document-content h2:first-of-type {
    margin-top: 0;
}

.document-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.document-content p {
    margin-bottom: 16px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.document-content ul,
.document-content ol {
    margin-left: 24px;
    margin-bottom: 24px;
}

.document-content li {
    margin-bottom: 12px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.document-content strong {
    color: var(--primary);
    font-weight: 600;
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, rgba(34, 34, 34, 0.06) 0%, rgba(85, 85, 85, 0.06) 100%);
    border-left: 4px solid var(--primary);
    padding: 24px;
    margin: 32px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.info-box p {
    margin-bottom: 8px;
}

.info-box p:last-child {
    margin-bottom: 0;
}

/* Back Link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 48px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.back-link:hover {
    gap: 12px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 48px 0;
    text-align: center;
}

.footer-links {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    gap: 32px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 120px 0 80px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .page-header {
        padding: 100px 0 50px;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.8rem;
        margin-bottom: 40px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .feature-card {
        padding: 32px;
    }

    .document-content {
        margin: -20px 16px 40px;
        padding: 32px 24px;
    }

    .document-content h2 {
        font-size: 1.4rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}