:root {
    --primary: #0066FF;
    --primary-dark: #0052CC;
    --secondary: #00C471;
    --accent: #FF6B35;
    --bg: #FAFBFC;
    --text: #1A1A2E;
    --text-light: #6B7280;
    --card-bg: #FFFFFF;
    --gradient: linear-gradient(135deg, #0066FF 0%, #00C471 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', 'Noto Sans KR', 'Noto Sans JP', 'Noto Sans SC', 'Noto Sans TC', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Header */
header {
    background: var(--card-bg);
    padding: 16px 24px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.logo span {
    font-weight: 700;
    font-size: 20px;
}

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

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.download-btn {
    background: var(--primary);
    color: white !important;
    padding: 10px 24px;
    border-radius: 24px;
    font-weight: 600;
}

.download-btn:hover {
    background: var(--primary-dark);
}

/* Hero Section */
.hero {
    padding: 160px 24px 100px;
    text-align: center;
    background: linear-gradient(180deg, #F0F7FF 0%, var(--bg) 100%);
}

.hero h1 {
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.app-store-badge {
    height: 56px;
    transition: transform 0.2s;
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.hero-image {
    margin-top: 60px;
    max-width: 100%;
}

.hero-image img {
    max-width: 800px;
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 40px 80px rgba(0,102,255,0.15);
}

/* Features Section */
.features {
    padding: 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 900;
    margin-bottom: 16px;
}

.section-title p {
    color: var(--text-light);
    font-size: 18px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--card-bg);
    padding: 32px;
    border-radius: 24px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-light);
    font-size: 15px;
}

.icon-calendar { background: linear-gradient(135deg, #E8F4FF 0%, #D1E9FF 100%); }
.icon-ai { background: linear-gradient(135deg, #E8FFF1 0%, #D1FFE4 100%); }
.icon-bonus { background: linear-gradient(135deg, #FFF4E8 0%, #FFE8D1 100%); }
.icon-widget { background: linear-gradient(135deg, #F4E8FF 0%, #E8D1FF 100%); }
.icon-backup { background: linear-gradient(135deg, #FFE8F1 0%, #FFD1E4 100%); }
.icon-world { background: linear-gradient(135deg, #E8FAFF 0%, #D1F4FF 100%); }

/* Screenshot Section */
.screenshots {
    padding: 100px 24px;
    background: linear-gradient(180deg, var(--bg) 0%, #E8F4FF 100%);
    overflow: hidden;
}

.screenshot-slider {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 40px;
}

.screenshot-slider img {
    width: 220px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

/* CTA Section */
.cta {
    padding: 100px 24px;
    text-align: center;
    background: var(--gradient);
    color: white;
}

.cta h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 900;
    margin-bottom: 20px;
}

.cta p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: white;
    color: var(--primary);
    border-radius: 32px;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    transition: transform 0.2s;
}

.cta-button:hover {
    transform: scale(1.05);
}

/* Footer */
footer {
    padding: 60px 24px;
    background: var(--text);
    color: white;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

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

.footer-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.footer-copy {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
}

/* Mobile */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: 120px 20px 60px;
    }
    
    .features, .testimonials {
        padding: 60px 20px;
    }
    
    .screenshot-slider img {
        width: 160px;
    }
    
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

header + .lang-bar { margin-top: 72px; }
.hero { padding-top: 72px; }
.hero p { margin-bottom: 32px; }
.feature-card p + p { margin-top: 8px; }
.screenshot-slider img { height: auto; }
.app-store-badge.on-dark { background: #fff; border-radius: 12px; padding: 4px; }
@media (max-width: 768px) {
.nav-links { display: flex; gap: 12px; }
.nav-links .hide-mobile { display: none; }
.hero { padding: 56px 20px 48px; }
header + .lang-bar { margin-top: 72px; }
}

/* Language switcher */
.lang-bar { background: #fff; border-bottom: 1px solid #E5E7EB; }
.langs {
    max-width: 960px; margin: 0 auto; padding: 10px 24px;
    display: flex; flex-wrap: wrap; gap: 6px; justify-content: center;
}
.langs a {
    font-size: 13px; line-height: 1.4; padding: 4px 10px; border-radius: 999px;
    border: 1px solid #E5E7EB; color: #6B7280; text-decoration: none; background: #fff;
    transition: all 0.15s;
}
.langs a:hover { color: #0066FF; border-color: #0066FF; }
.langs a[aria-current="true"] { background: #0066FF; border-color: #0066FF; color: #fff; font-weight: 600; }