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

:root {
    --brand: #3B82F6;
    --brand-dark: #2563EB;
    --brand-light: #DBEAFE;
    --bg: #FAFBFC;
    --text: #1F2937;
    --text-light: #6B7280;
    --card-bg: #FFFFFF;
    --border: #E5E7EB;
    --section-alt: #F3F4F6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Top Nav ---- */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 32px;
}

.logo {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ---- Language Switcher ---- */
.lang-switch {
    display: flex;
    gap: 4px;
}

.lang-switch a,
.lang-switch button {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: 4px 10px;
    border-radius: 4px;
    transition: background 0.2s, color 0.2s;
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

.lang-switch a:hover,
.lang-switch a.active,
.lang-switch button:hover,
.lang-switch button.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
}

/* ---- Hero Header ---- */
.hero-header {
    background: linear-gradient(135deg, var(--brand), var(--brand-dark));
    color: white;
    padding: 32px 0 64px;
    text-align: center;
}

.hero-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.3;
    margin-bottom: 16px;
}

.hero-sub {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 32px;
    line-height: 1.7;
}

.cta-button {
    display: inline-block;
    background: #fff;
    color: var(--brand-dark);
    font-weight: 700;
    font-size: 1rem;
    padding: 14px 36px;
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.15s, box-shadow 0.15s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.cta-button img {
    height: 44px;
    display: block;
}

.price {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: 12px;
}

/* ---- App Screenshots ---- */
.app-screenshots {
    background: linear-gradient(180deg, var(--brand-dark) 0%, var(--bg) 40%);
    padding: 0 0 64px;
    overflow: hidden;
}

.screenshots-row {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 24px;
    max-width: 720px;
    margin: 0 auto;
}

.phone-frame {
    flex: 0 0 200px;
    border-radius: 28px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.18), 0 4px 16px rgba(0, 0, 0, 0.08);
    border: 3px solid rgba(255, 255, 255, 0.15);
    background: #000;
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.phone-frame:hover {
    transform: translateY(-6px);
}

.phone-frame-hero {
    flex: 0 0 230px;
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.25), 0 6px 20px rgba(0, 0, 0, 0.1);
    border: 3px solid rgba(255, 255, 255, 0.25);
    z-index: 1;
}

.phone-frame img {
    display: block;
    width: 100%;
    height: auto;
}

@media (max-width: 640px) {
    .app-screenshots {
        padding: 0 0 48px;
    }

    .screenshots-row {
        gap: 12px;
        padding: 0 16px;
    }

    .phone-frame {
        flex: 0 0 30%;
        border-radius: 20px;
        border-width: 2px;
    }

    .phone-frame-hero {
        flex: 0 0 34%;
        border-width: 2px;
    }
}

/* ---- How It Works ---- */
.how-it-works {
    padding: 64px 0;
    text-align: center;
}

.how-it-works h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 40px;
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.step {
    flex: 1;
    max-width: 200px;
}

.step-num {
    width: 40px;
    height: 40px;
    background: var(--brand);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin: 0 auto 12px;
}

.step h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.step p {
    font-size: 0.85rem;
    color: var(--text-light);
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--text-light);
    flex-shrink: 0;
}

/* ---- Modes (Three Cards) ---- */
.modes {
    background: var(--section-alt);
    padding: 64px 0;
    text-align: center;
}

.modes h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 32px;
}

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

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px 20px;
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ---- More Features (List) ---- */
.more-features {
    padding: 64px 0;
}

.more-features h2 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
}

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

.feature-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-item-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-light);
    border-radius: 12px;
}

.feature-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ---- Use Cases ---- */
.use-cases {
    background: var(--section-alt);
    padding: 64px 0;
    text-align: center;
}

.use-cases h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 32px;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.use-case-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px 16px;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.2s, box-shadow 0.2s;
}

.use-case-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.use-case-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.use-case-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.use-case-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.5;
}

@media (max-width: 640px) {
    .use-cases-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ---- Privacy Callout ---- */
.privacy-callout {
    background: var(--section-alt);
    padding: 48px 0;
    text-align: center;
}

.privacy-callout h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.privacy-callout p {
    font-size: 0.95rem;
    color: var(--text-light);
    max-width: 520px;
    margin: 0 auto;
}

/* ---- Final CTA ---- */
.final-cta {
    padding: 64px 0;
    text-align: center;
}

.final-cta h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.final-cta .cta-button {
    background: var(--brand);
    color: #fff;
}

.final-cta .cta-button:hover {
    background: var(--brand-dark);
}

.final-cta .price {
    color: var(--text-light);
    opacity: 1;
}

/* ---- Related Use Cases (cross-links on use-case pages) ---- */
.related-use-cases {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.related-use-cases h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-light);
}

.related-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.related-links a {
    flex: 1;
    min-width: 140px;
    padding: 14px 16px;
    background: var(--brand-light);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s;
}

.related-links a:hover {
    background: var(--brand);
    color: #fff;
}

/* ---- Footer ---- */
footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
    color: var(--text-light);
    font-size: 0.85rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--brand);
}

/* ---- Policy / Support pages (kept from original) ---- */
.page-content {
    padding: 48px 0 60px;
}

.page-content h1 {
    font-size: 1.6rem;
    margin-bottom: 8px;
}

.page-content .subtitle {
    color: var(--text-light);
    margin-bottom: 32px;
}

.page-content h2 {
    font-size: 1.2rem;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--brand-dark);
}

.page-content h3 {
    font-size: 1.05rem;
    margin-top: 24px;
    margin-bottom: 8px;
}

.page-content p,
.page-content li {
    color: var(--text);
    margin-bottom: 8px;
}

.page-content ul {
    padding-left: 24px;
    margin-bottom: 16px;
}

.page-content a {
    color: var(--brand);
    text-decoration: none;
}

.page-content a:hover {
    text-decoration: underline;
}

.back-link {
    display: inline-block;
    margin-top: 40px;
    color: var(--brand);
    text-decoration: none;
    font-weight: 500;
}

.back-link:hover {
    text-decoration: underline;
}

/* ---- Page-level lang switch (light bg) ---- */
.page-lang-switch button {
    color: var(--text-light);
}

.page-lang-switch button:hover,
.page-lang-switch button.active {
    color: var(--brand);
    background: var(--brand-light);
}

/* ---- Logo link ---- */
.logo a {
    color: inherit;
    text-decoration: none;
}

header .logo {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    padding: 16px 0;
}

/* ---- Use Case Pages ---- */
.use-case-page h1 {
    font-size: 1.5rem;
    line-height: 1.4;
}

.use-case-page h2 {
    margin-top: 36px;
}

.use-case-steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 24px 0;
}

.use-case-step {
    background: var(--brand-light);
    border-radius: 12px;
    padding: 20px 24px;
}

.use-case-step strong {
    color: var(--brand-dark);
}

.use-case-step p {
    margin-top: 4px;
    margin-bottom: 0;
}

.use-case-cta {
    text-align: center;
    margin: 48px 0 24px;
}

.use-case-cta .cta-button {
    background: var(--brand);
    color: #fff;
    display: inline-block;
    padding: 14px 36px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 700;
    transition: background 0.15s;
}

.use-case-cta .cta-button:hover {
    background: var(--brand-dark);
}

.use-case-cta .price {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-top: 12px;
}

/* ---- Footer use-case links ---- */
.footer-use-cases {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 8px;
    font-size: 0.8rem;
}

.footer-use-cases a {
    color: var(--text-light);
    text-decoration: none;
    opacity: 0.8;
}

.footer-use-cases a:hover {
    color: var(--brand);
    opacity: 1;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .hero-content h1 {
        font-size: 1.6rem;
    }

    .hero-sub {
        font-size: 1rem;
    }

    .steps {
        flex-direction: column;
        gap: 8px;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-list {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 24px 16px;
    }
}