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

:root {
    --bg-primary: #FFFFFF;
    --bg-warm: #FAFAF7;
    --text-primary: #111111;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --accent-green: #CFE8D5;
    --accent-orange: #F6D8B8;
    --accent-blue: #DCE8F6;
    --border: rgba(0, 0, 0, 0.06);
    --shadow-soft: 0 2px 12px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 4px 24px rgba(0, 0, 0, 0.06);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 20px;
    --radius-lg: 28px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color 0.2s;
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-switch {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.lang-switch:hover {
    border-color: var(--text-tertiary);
    color: var(--text-primary);
}

.nav-cta {
    padding: 10px 20px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 100px;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-cta:hover {
    opacity: 0.8;
}

/* Hero */
.hero {
    padding: 140px 0 80px;
    background: var(--bg-warm);
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
    display: block;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-title .soft {
    color: var(--text-secondary);
    font-weight: 500;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 440px;
}

.hero-cta {
    margin-bottom: 20px;
}

.hero-note {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.dot {
    width: 6px;
    height: 6px;
    background: var(--accent-green);
    border-radius: 50%;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 100px;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1rem;
}

/* Hero Screenshot */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.screenshot-wrapper {
    position: relative;
}

.screenshot {
    max-height: 500px;
    width: auto;
    border-radius: 32px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.15), 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Values */
.values {
    padding: 100px 0;
    background: var(--bg-primary);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-item {
    text-align: center;
    padding: 32px 24px;
}

.value-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    margin: 0 auto 20px;
}

.icon-photo { background: var(--accent-blue); }
.icon-ai { background: var(--accent-green); }
.icon-search { background: var(--accent-orange); }
.icon-local { background: #e0e0e0; }

.value-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.value-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Section Header */
.section-header {
    text-align: center;
    max-width: 480px;
    margin: 0 auto 60px;
}

.section-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
    display: block;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-desc {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
    background: var(--bg-warm);
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    width: 200px;
}

.step-number {
    display: inline-block;
    width: 28px;
    height: 28px;
    background: var(--accent-green);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 28px;
    margin-bottom: 20px;
}

.step-visual {
    width: 140px;
    height: 180px;
    background: var(--bg-primary);
    border-radius: var(--radius);
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    padding: 8px;
}

.step-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.icon-camera { background: var(--text-primary); }
.icon-ai-process { background: var(--accent-green); }
.icon-save { background: var(--accent-blue); }

.step-screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 16px;
}

.step h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
}

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

.step-arrow {
    color: var(--text-tertiary);
    margin-top: -20px;
}

/* Screenshots Section */
.screenshots {
    padding: 100px 0;
    background: var(--bg-primary);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.screenshot-card {
    text-align: center;
}

.screenshot-card img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 24px;
    box-shadow: var(--shadow-medium);
    margin-bottom: 12px;
    transition: transform 0.3s;
}

.screenshot-card:hover img {
    transform: translateY(-8px);
}

.screenshot-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Use Cases */
.use-cases {
    padding: 100px 0;
    background: var(--bg-warm);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.case-card {
    padding: 28px;
    background: var(--bg-primary);
    border-radius: var(--radius);
    transition: transform 0.3s;
}

.case-card:hover {
    transform: translateY(-4px);
}

.case-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    margin-bottom: 16px;
}

.icon-shopping { background: var(--accent-blue); }
.icon-location { background: var(--accent-green); }
.icon-expiry { background: var(--accent-orange); }
.icon-baby { background: linear-gradient(135deg, #E8D5CF, #F6D8B8); }

.case-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.case-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Philosophy */
.philosophy {
    padding: 80px 0;
    background: var(--bg-primary);
}

blockquote {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

blockquote p {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 16px;
}

blockquote cite {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-style: normal;
}

/* Download */
.download {
    padding: 100px 0;
    background: var(--bg-warm);
}

.download-content {
    text-align: center;
    max-width: 400px;
    margin: 0 auto;
}

.download-content h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.download-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.download-note {
    margin-top: 20px;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* FAQ */
.faq {
    padding: 100px 0;
    background: var(--bg-primary);
}

.faq-list {
    max-width: 680px;
    margin: 0 auto;
}

.faq-item {
    padding: 24px 0;
    border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.faq-item p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Footer */
footer {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 0.875rem;
    opacity: 0.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.link-group h4 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    opacity: 0.5;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 10px;
}

.link-group a {
    color: var(--bg-primary);
    opacity: 0.7;
    text-decoration: none;
    font-size: 0.875rem;
    transition: opacity 0.2s;
}

.link-group a:hover {
    opacity: 1;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8125rem;
    opacity: 0.5;
}

/* Responsive */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-subtitle {
        margin: 0 auto 32px;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .screenshot {
        max-height: 400px;
    }
    
    .values-grid,
    .cases-grid,
    .screenshots-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 640px) {
    .nav-menu {
        display: none;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .screenshot {
        max-height: 350px;
    }
    
    .values-grid,
    .cases-grid,
    .screenshots-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
        margin: 0;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}