/* === DuruDuru Landing Page === */

:root {
    --color-bg: #F9FAFB;
    --color-surface: #FFFFFF;
    --color-text: #111827;
    --color-text-secondary: #6B7280;
    --color-primary: #059669;
    --color-primary-dark: #047857;
    --color-accent: #7F0000;
    --color-border: #E5E7EB;
    --color-badge: #ECFDF5;
    --color-badge-text: #065F46;
    --color-highlight-bg: #F0FDF4;
    --font-ko: 'Noto Sans KR', sans-serif;
    --font-en: 'Inter', sans-serif;
    --radius: 16px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 24px rgba(0,0,0,0.08);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-ko);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

[lang="en"] body { font-family: var(--font-en); }

/* === Nav === */

.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-right { display: flex; gap: 4px; }

.lang-btn {
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: transparent;
    font-size: 0.875rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all 0.2s;
}

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

/* === Hero === */

.hero {
    padding: 140px 24px 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--color-highlight-bg) 0%, var(--color-bg) 100%);
}

.hero-inner { max-width: 720px; margin: 0 auto; }

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-badge);
    color: var(--color-badge-text);
    border-radius: 99px;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.25;
    letter-spacing: -1px;
    margin-bottom: 20px;
}

.hero-sub {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
}

/* Hero mockup image */
.hero-image {
    display: flex;
    justify-content: center;
    margin-bottom: 32px;
}

.hero-mockup {
    max-width: 560px;
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.hero-cta { display: flex; justify-content: center; gap: 12px; }

/* === Buttons === */

.btn {
    display: inline-block;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

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

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

.btn-large {
    padding: 20px 48px;
    font-size: 1.25rem;
}

/* === Sections === */

.section {
    padding: 80px 24px;
}

.section-inner {
    max-width: 1080px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-sub {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 48px;
}

/* === Story Section === */

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

.story-box {
    max-width: 680px;
    margin: 0 auto;
    padding: 40px;
    border-radius: var(--radius);
    background: var(--color-surface);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow);
}

.story-banner {
    width: 100%;
    border-radius: 12px;
    margin-bottom: 24px;
    object-fit: cover;
    max-height: 300px;
}

.story-title {
    font-size: 1.75rem;
    font-weight: 900;
    margin-bottom: 20px;
    color: var(--color-text);
}

.story-text {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: 16px;
}

.story-author {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-primary);
    text-align: right;
    margin-top: 12px;
}

/* === Pain Section === */

.section-pain { background: var(--color-surface); }

.pain-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.pain-card {
    padding: 28px;
    border-radius: var(--radius);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

.pain-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 12px;
}

.pain-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.pain-card p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.pain-card-wide {
    grid-column: 1 / -1;
    background: var(--color-highlight-bg);
    border-color: var(--color-primary);
}

/* === Feature Section === */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    padding: 32px 24px;
    border-radius: var(--radius);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    font-weight: 900;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* === Pricing === */

.section-pricing { background: var(--color-surface); }

.price-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    align-items: start;
}

.price-card {
    padding: 32px 24px;
    border-radius: var(--radius);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    text-align: center;
}

.price-card-highlight {
    border-color: var(--color-primary);
    background: var(--color-highlight-bg);
    position: relative;
    transform: scale(1.05);
}

.price-badge {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 99px;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--color-badge);
    color: var(--color-badge-text);
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 24px;
    color: var(--color-text);
}

.price-won { font-size: 1.25rem; }
.price-month { font-size: 1rem; color: var(--color-text-secondary); font-weight: 400; }

.price-card ul {
    list-style: none;
    text-align: left;
}

.price-card li {
    padding: 8px 0;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
}

.price-card li:last-child { border-bottom: none; }

.price-card li::before {
    content: "✓ ";
    color: var(--color-primary);
    font-weight: 700;
}

/* === Download === */

.section-download {
    text-align: center;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-highlight-bg) 100%);
    padding: 100px 24px;
}

.dl-note {
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* === Footer === */

.footer {
    padding: 48px 24px;
    background: var(--color-text);
    color: #9CA3AF;
    text-align: center;
}

.footer-inner { max-width: 1080px; margin: 0 auto; }

.footer-brand {
    font-family: var(--font-en);
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
}

.footer a { color: var(--color-primary); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer p { margin-bottom: 8px; font-size: 0.875rem; }
.footer-copy { margin-top: 24px; font-size: 0.75rem; color: #6B7280; }

/* === Responsive === */

@media (max-width: 768px) {
    .hero-title { font-size: 2rem; }
    .hero-sub { font-size: 1rem; }
    .pain-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    .price-grid { grid-template-columns: 1fr; }
    .price-card-highlight { transform: none; }
    .section-title { font-size: 1.75rem; }
    .section { padding: 60px 16px; }
    .hero { padding: 100px 16px 60px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.75rem; }
    .btn-large { padding: 16px 32px; font-size: 1.1rem; }
}