:root {
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #111827;
    --color-text-muted: #4b5563;
    --color-text-faint: #6b7280;
    --color-border: rgba(15, 23, 42, 0.08);
    --color-primary: #4A90E2;
    --color-primary-dark: #2563eb;
    --color-accent: #50E3C2;
    --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.08);
    --shadow-lift: 0 20px 45px rgba(15, 23, 42, 0.12);
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --max-width: 1080px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: var(--color-primary-dark);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Header --- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(248, 250, 252, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    color: var(--color-text);
    text-decoration: none;
}

.brand img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

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

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: 999px;
    background: var(--color-text);
    color: #fff !important;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.25);
}

/* --- Hero --- */

.hero {
    padding: 84px 0 64px;
    text-align: center;
    background:
        radial-gradient(60% 60% at 50% 0%, rgba(74, 144, 226, 0.12), transparent),
        radial-gradient(50% 50% at 85% 15%, rgba(80, 227, 194, 0.12), transparent);
}

.hero-logo {
    width: 84px;
    height: 84px;
    border-radius: 20px;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-soft);
}

.hero h1 {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin: 0 0 16px;
}

.hero p.subtitle {
    font-size: clamp(16px, 2.2vw, 20px);
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto 32px;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff !important;
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text) !important;
    border-color: var(--color-border);
}

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

.hero-note {
    font-size: 13px;
    color: var(--color-text-faint);
}

/* --- Privacy banner (shared callout style) --- */

.privacy-banner {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    max-width: 760px;
    margin: 0 auto;
    padding: 20px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    text-align: left;
}

.privacy-banner .icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(80, 227, 194, 0.18);
    color: #0f766e;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.privacy-banner strong {
    display: block;
    margin-bottom: 4px;
}

.privacy-banner p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 14.5px;
}

/* --- Sections --- */

section {
    padding: 72px 0;
}

.section-heading {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
}

.section-heading .eyebrow {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-primary-dark);
    margin-bottom: 10px;
}

.section-heading h2 {
    font-size: clamp(26px, 3.4vw, 34px);
    margin: 0 0 12px;
    letter-spacing: -0.01em;
}

.section-heading p {
    color: var(--color-text-muted);
    margin: 0;
}

/* --- Feature grid --- */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 26px;
    box-shadow: var(--shadow-soft);
}

.feature-card .badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: rgba(74, 144, 226, 0.12);
    color: var(--color-primary-dark);
    font-weight: 700;
    margin-bottom: 14px;
}

.feature-card h3 {
    margin: 0 0 8px;
    font-size: 17px;
}

.feature-card p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 14.5px;
}

/* --- How it works --- */

.how-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.how-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-soft);
}

.how-card .step {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-text-faint);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.how-card h3 {
    margin: 0 0 10px;
    font-size: 19px;
}

.how-card p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 14.5px;
}

.how-card code {
    background: rgba(15, 23, 42, 0.06);
    padding: 2px 6px;
    border-radius: 6px;
    font-size: 13px;
}

/* --- Screenshots --- */

.screenshot-section {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.screenshot-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.screenshot-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    object-position: top;
    border-bottom: 1px solid var(--color-border);
}

.screenshot-card figcaption {
    margin: 0;
    padding: 12px 16px;
    font-size: 13.5px;
    color: var(--color-text-muted);
    text-align: center;
}

/* --- Requirements --- */

.requirements-box {
    max-width: 760px;
    margin: 0 auto;
    background: rgba(251, 191, 36, 0.1);
    border: 1px solid rgba(251, 191, 36, 0.35);
    border-radius: var(--radius-md);
    padding: 22px 26px;
    font-size: 14.5px;
    color: #7c4a03;
}

.requirements-box strong {
    color: #92400e;
}

/* --- CTA band --- */

.cta-band {
    text-align: center;
    background: linear-gradient(135deg, #111827, #1f2937);
    color: #f9fafb;
    border-radius: var(--radius-lg);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 56px 32px;
}

.cta-band h2 {
    margin: 0 0 12px;
    font-size: clamp(24px, 3vw, 32px);
}

.cta-band p {
    color: rgba(249, 250, 251, 0.75);
    max-width: 520px;
    margin: 0 auto 28px;
}

.cta-band .btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #fff !important;
    border-color: rgba(255, 255, 255, 0.2);
}

.cta-band .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
}

/* --- Footer --- */

.site-footer {
    padding: 40px 0 56px;
    border-top: 1px solid var(--color-border);
}

.site-footer .container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 13.5px;
}

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

.footer-copy {
    font-size: 13px;
    color: var(--color-text-faint);
}

/* --- Simple content page (privacy.html) --- */

.doc-page {
    max-width: 760px;
    margin: 0 auto;
    padding: 56px 24px 96px;
}

.doc-page h1 {
    font-size: clamp(28px, 4vw, 36px);
    margin-bottom: 6px;
}

.doc-page .updated {
    color: var(--color-text-faint);
    font-size: 13.5px;
    margin-bottom: 40px;
}

.doc-page h2 {
    font-size: 20px;
    margin: 40px 0 14px;
}

.doc-page p, .doc-page li {
    color: var(--color-text-muted);
    font-size: 15px;
}

.doc-page table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.doc-page th, .doc-page td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--color-border);
}

.doc-page th {
    color: var(--color-text-faint);
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.doc-page .callout {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    box-shadow: var(--shadow-soft);
    margin: 24px 0;
}

@media (max-width: 640px) {
    .nav-links {
        display: none;
    }
}