/* ===============================================
   Apple-Inspired Design System
   =============================================== */

:root {
    /* Apple Color Palette - More Minimalist */
    --apple-blue: #007AFF;
    --apple-indigo: #5856D6;
    --apple-purple: #AF52DE;
    --apple-pink: #FF2D55;
    --apple-red: #FF3B30;
    --apple-orange: #FF9500;
    --apple-yellow: #FFCC00;
    --apple-green: #34C759;
    --apple-teal: #5AC8FA;
    --apple-cyan: #32ADE6;

    /* Neutral Colors */
    --black: #000000;
    --white: #FFFFFF;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F7;
    --gray-200: #E8E8ED;
    --gray-300: #D2D2D7;
    --gray-400: #AEAEB2;
    --gray-500: #8E8E93;
    --gray-600: #636366;
    --gray-700: #48484A;
    --gray-800: #3A3A3C;
    --gray-900: #1C1C1E;

    /* Primary Brand Colors - Simplified */
    --primary: #007AFF;
    --primary-dark: #0051D5;
    --primary-light: #4A9EFF;
    --secondary: #FF9500;
    --accent: #34C759;

    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #F5F5F7;
    --bg-tertiary: #f1f5f9;

    /* Text Colors */
    --text-primary: #1D1D1F;
    --text-secondary: #6E6E73;
    --text-tertiary: #86868B;
    --text-inverse: #ffffff;

    /* Apple Gradients - Subtle */
    --gradient-dawn: linear-gradient(135deg, #FF6B9D 0%, #C239B3 100%);
    --gradient-ocean: linear-gradient(135deg, #007AFF 0%, #0051D5 100%);
    --gradient-sunset: linear-gradient(135deg, #FF9500 0%, #FF3B30 100%);
    --gradient-gold: linear-gradient(135deg, #FFCC00 0%, #FF9500 100%);
    --gradient-forest: linear-gradient(135deg, #34C759 0%, #30D158 100%);
    --gradient-sky: linear-gradient(135deg, #5AC8FA 0%, #32ADE6 100%);
    --gradient-fire: linear-gradient(135deg, #FF2D55 0%, #FF9500 100%);
    --gradient-purple: linear-gradient(135deg, #AF52DE 0%, #5856D6 100%);

    /* Apple Shadows - Very Subtle */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.12);
    --shadow-2xl: 0 16px 48px rgba(0, 0, 0, 0.16);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-blur: blur(20px);

    /* Spacing (Apple-like) */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --radius-full: 9999px;

    /* Typography - Lighter weights */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Noto Sans KR', 'SF Pro Display', 'Segoe UI', 'Roboto', sans-serif;
    --font-display: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ===============================================
   Base Styles
   =============================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
}

/* ===============================================
   Glassmorphic Header
   =============================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    padding: 0 var(--space-lg);
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: all var(--transition-base);
}

.logo span {
    font-size: 0.65rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    padding: 4px 10px;
    border-radius: var(--radius-full);
    margin-left: var(--space-sm);
    font-weight: 500;
    display: inline-block;
    transform: translateY(-2px);
}

.logo:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.nav-links {
    display: flex;
    gap: var(--space-xs);
}

.nav-link {
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.header-btn {
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-base);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.header-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

/* ===============================================
   Container
   =============================================== */

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

/* ===============================================
   Buttons (Apple Style)
   =============================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    outline: none;
}

.btn-primary {
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    color: var(--text-primary);
    background: white;
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-lg {
    padding: 18px 36px;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.9rem;
}

/* ===============================================
   Cards (Glassmorphic & Premium)
   =============================================== */

.card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-slow);
    border: 1px solid var(--gray-200);
}

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

.card-glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
}

.card-gradient {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ===============================================
   Typography
   =============================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

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

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

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

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

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

.text-sm {
    font-size: 0.875rem;
}

.text-xs {
    font-size: 0.75rem;
}

/* ===============================================
   Mobile Menu
   =============================================== */

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: white;
    box-shadow: var(--shadow-2xl);
    transition: right var(--transition-slow);
    z-index: 2000;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: 1999;
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
}

.mobile-menu-close {
    font-size: 2rem;
    color: var(--text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.mobile-menu-close:hover {
    background: var(--gray-100);
}

.mobile-menu-links {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-menu-links a {
    padding: var(--space-md);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-menu-links a:hover {
    background: var(--gray-100);
}

.mobile-menu-links .mobile-cta {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    text-align: center;
    margin-top: var(--space-md);
}

/* ===============================================
   Scroll Top Button
   =============================================== */

.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: white;
    border: none;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.scroll-top-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    background: var(--primary);
    color: white;
}

/* ===============================================
   Footer
   =============================================== */

.footer {
    background: linear-gradient(180deg, var(--gray-900) 0%, #000 100%);
    padding: var(--space-4xl) 0 var(--space-xl);
    color: var(--text-inverse);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 900;
    margin-bottom: var(--space-md);
}

.footer-logo span {
    color: var(--primary-light);
}

.footer-section h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-md);
}

.footer-section a {
    display: block;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: 6px 0;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: var(--primary-light);
    text-decoration: none;
}

.copyright {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
    margin-top: var(--space-md);
}

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

/* Mobile Menu Styles */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-primary);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    z-index: 1002;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    padding: var(--space-md) 0;
}

.mobile-menu-links a {
    padding: var(--space-md) var(--space-lg);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid var(--border-light);
    transition: all 0.2s;
}

.mobile-menu-links a:hover {
    background: var(--bg-soft);
    color: var(--primary);
}

.mobile-menu-links .mobile-cta {
    margin: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: var(--gradient-primary);
    color: white !important;
    text-align: center;
    border-radius: var(--radius-lg);
    border: none;
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 968px) {

    .nav-links,
    .nav-right {
        display: none;
    }

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

    .footer-content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 32px 24px;
    }

    .footer-section:first-child {
        grid-column: 1 / -1;
        text-align: center;
        padding-bottom: 24px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .footer-section h3 {
        font-size: 0.75rem;
        margin-bottom: 12px;
    }

    .footer-section a {
        font-size: 0.85rem;
        padding: 6px 0;
    }

    .footer-bottom {
        padding-top: 20px;
        font-size: 0.8rem;
    }
}

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

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }
}