:root {
    --bg: #F4F6FA;
    --card: #FFFFFF;
    --accent: #3D7BF5;
    --accent-pressed: #1D4ED8;
    --accent-grad-end: #7C5CFF;
    --text-primary: #14171F;
    --text-secondary: #6B7280;
    --success: #22C55E;
    --rating-yellow: #FBBF24;
    --destructive: #EF4444;
    --answer-tint: #E8F0FE;
    --border-light: #E5E7EB;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --max-width: 1100px;
}

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

html {
    scroll-behavior: smooth;
}

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

/* ── Nav ────────────────────────────── */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(244, 246, 250, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
}
.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}
.nav-logo img {
    width: 38px;
    height: 38px;
    border-radius: 10px;
}
.nav-logo span {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}
.nav-cta {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 10px 22px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.nav-cta:hover {
    background: var(--accent-pressed);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ── Hero ───────────────────────────── */
.hero {
    padding: 140px 24px 80px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.hero-icon {
    width: 90px;
    height: 90px;
    border-radius: 22px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 32px;
}
.hero h1 {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: clamp(36px, 6vw, 52px);
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    line-height: 1.15;
    margin-bottom: 20px;
}
.hero h1 .highlight {
    background: linear-gradient(135deg, var(--accent), var(--accent-grad-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.6;
}
.hero-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ── Content Section ─────────────────── */
.content-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 24px 80px;
}
.content-section h2 {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: clamp(24px, 3.5vw, 30px);
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
    margin-bottom: 16px;
    margin-top: 48px;
}
.content-section h2:first-of-type {
    margin-top: 0;
}
.content-section h3 {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    margin-top: 32px;
}
.content-section p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 14px;
}
.content-section ul, .content-section ol {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    padding-left: 24px;
}
.content-section li {
    margin-bottom: 8px;
}
.content-section a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}
.content-section a:hover {
    color: var(--accent-pressed);
    text-decoration: underline;
}
.content-section .last-updated {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-style: italic;
}

/* ── Support Contact Card ────────────── */
.contact-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 36px;
    box-shadow: var(--shadow-md);
    border: 1.5px solid var(--border-light);
    margin-top: 32px;
}
.contact-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-light);
}
.contact-row:last-child {
    border-bottom: none;
}
.contact-row-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--answer-tint);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.contact-row h3 {
    font-size: 15px;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}
.contact-row p, .contact-row a {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
    text-decoration: none;
}
.contact-row a:hover {
    color: var(--accent);
}

/* ── Buttons ──────────────────────────── */
.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-grad-end));
    color: #fff;
    border: none;
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 20px rgba(61, 123, 245, 0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(61, 123, 245, 0.45);
}
.btn-outline {
    background: var(--card);
    color: var(--accent);
    border: 2px solid var(--accent);
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-outline:hover {
    background: var(--answer-tint);
    transform: translateY(-2px);
}

/* ── Highlight Card ──────────────────── */
.highlight-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 24px;
}
.highlight-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 48px;
    border: 1.5px solid var(--border-light);
}
.highlight-card .highlight-content {
    flex: 1;
}
.highlight-card .highlight-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--accent-grad-end));
    color: #fff;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
}
.highlight-card h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 12px;
}
.highlight-card p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.highlight-card .highlight-visual {
    flex-shrink: 0;
    width: 180px;
    height: 180px;
    border-radius: 24px;
    background: var(--answer-tint);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    color: var(--accent);
}

/* ── Section ──────────────────────────── */
.section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 24px;
}
.section-label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--accent);
    margin-bottom: 8px;
}
.section-title {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: clamp(28px, 4vw, 38px);
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
    margin-bottom: 16px;
}
.section-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 540px;
}

/* ── Features Grid ────────────────────── */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1.5px solid transparent;
    transition: all 0.3s ease;
}
.feature-card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 18px;
    background: var(--answer-tint);
    color: var(--accent);
}
.feature-card h3 {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* ── Premium Section ──────────────────── */
.premium-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 24px;
    text-align: center;
}
.premium-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 40px;
}
.premium-card {
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    box-shadow: var(--shadow-sm);
    border: 1.5px solid var(--border-light);
    text-align: left;
    transition: all 0.3s ease;
}
.premium-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}
.premium-card .check {
    color: var(--success);
    font-weight: 700;
    margin-right: 8px;
}
.premium-card span {
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 500;
}

/* ── CTA Banner ───────────────────────── */
.cta-banner {
    max-width: var(--max-width);
    margin: 0 auto 80px;
    padding: 0 24px;
}
.cta-banner-inner {
    background: linear-gradient(135deg, var(--accent), var(--accent-grad-end));
    border-radius: var(--radius-xl);
    padding: 56px 40px;
    text-align: center;
    color: #fff;
    box-shadow: 0 12px 50px rgba(61, 123, 245, 0.3);
}
.cta-banner-inner h2 {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: clamp(26px, 4vw, 34px);
    font-weight: 700;
    margin-bottom: 12px;
}
.cta-banner-inner p {
    font-size: 17px;
    opacity: 0.9;
    margin-bottom: 28px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}
.btn-white {
    background: #fff;
    color: var(--accent);
    border: none;
    padding: 14px 36px;
    border-radius: 100px;
    font-size: 17px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

/* ── Footer ───────────────────────────── */
.footer {
    background: var(--card);
    border-top: 1px solid var(--border-light);
    padding: 40px 24px;
}
.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}
.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}
.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: var(--accent);
}
.footer-copy {
    color: var(--text-secondary);
    font-size: 13px;
}

/* ── Responsive ───────────────────────── */
@media (max-width: 768px) {
    .hero {
        padding: 120px 20px 60px;
    }
    .hero-icon {
        width: 72px;
        height: 72px;
        border-radius: 18px;
    }
    .highlight-card {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
        gap: 24px;
    }
    .highlight-card .highlight-visual {
        width: 120px;
        height: 120px;
        font-size: 48px;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .premium-grid {
        grid-template-columns: 1fr;
    }
    .section {
        padding: 48px 20px;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    .btn-primary, .btn-outline {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
    .content-section {
        padding: 40px 20px 60px;
    }
    .content-section h2 {
        font-size: 22px;
    }
    .content-section h3 {
        font-size: 18px;
    }
    .contact-card {
        padding: 24px 20px;
    }
}