:root {
    --bg: #ffffff;
    --bg-soft: #f5f5f7;
    --text: #1d1d1f;
    --text-soft: #6e6e73;
    --accent: #007aff;
    --border: #e5e5ea;
    --card: #ffffff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #000000;
        --bg-soft: #1c1c1e;
        --text: #f5f5f7;
        --text-soft: #98989d;
        --accent: #0a84ff;
        --border: #2c2c2e;
        --card: #1c1c1e;
        --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.5);
    }
}

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

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);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */

header {
    padding: 24px 0;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
    header {
        background: rgba(0, 0, 0, 0.85);
    }
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 17px;
    color: var(--text);
}

.logo img {
    width: 32px;
    height: 32px;
    border-radius: 7px;
}

nav a {
    color: var(--text-soft);
    margin-left: 32px;
    font-size: 15px;
}

nav a:hover {
    color: var(--text);
    text-decoration: none;
}

/* Hero */

.hero {
    padding: 96px 0 64px;
    text-align: center;
}

.hero img.app-icon {
    width: 128px;
    height: 128px;
    border-radius: 28px;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.05;
    margin-bottom: 16px;
}

.hero .tagline {
    font-size: 22px;
    color: var(--text-soft);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.4;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.15s ease;
}

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

.btn-primary:hover {
    background: #0066d6;
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-soft);
    color: var(--text);
}

.btn-secondary:hover {
    background: var(--border);
    text-decoration: none;
}

.platform-note {
    margin-top: 24px;
    font-size: 13px;
    color: var(--text-soft);
}

/* Sections */

section {
    padding: 96px 0;
}

section.alt {
    background: var(--bg-soft);
}

h2 {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: 16px;
}

.section-sub {
    font-size: 19px;
    color: var(--text-soft);
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
    line-height: 1.5;
}

/* Features grid */

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

.feature-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 28px;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 19px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-soft);
    line-height: 1.5;
}

/* Privacy callout */

.privacy-callout {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 56px 40px;
    text-align: center;
    box-shadow: var(--shadow);
}

.privacy-callout h2 {
    margin-bottom: 24px;
}

.privacy-callout p {
    font-size: 17px;
    color: var(--text-soft);
    max-width: 580px;
    margin: 0 auto 16px;
    line-height: 1.6;
}

.privacy-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 40px;
    text-align: left;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.privacy-point {
    padding: 16px;
}

.privacy-point strong {
    display: block;
    font-size: 15px;
    color: var(--text);
    margin-bottom: 4px;
}

.privacy-point span {
    font-size: 14px;
    color: var(--text-soft);
}

/* Footer */

footer {
    padding: 48px 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-soft);
    font-size: 14px;
}

footer a {
    margin: 0 12px;
    color: var(--text-soft);
}

footer a:hover {
    color: var(--text);
    text-decoration: none;
}

/* Privacy policy page */

.policy {
    padding: 64px 0;
    max-width: 720px;
}

.policy h1 {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.policy .updated {
    color: var(--text-soft);
    font-size: 14px;
    margin-bottom: 48px;
}

.policy h2 {
    font-size: 24px;
    text-align: left;
    margin: 40px 0 16px;
    font-weight: 600;
}

.policy h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 8px;
}

.policy p,
.policy ul,
.policy table {
    margin-bottom: 16px;
    font-size: 16px;
}

.policy ul {
    padding-left: 24px;
}

.policy li {
    margin-bottom: 8px;
}

.policy table {
    border-collapse: collapse;
    width: 100%;
}

.policy table th,
.policy table td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

.policy table th {
    font-weight: 600;
    color: var(--text-soft);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.policy strong {
    color: var(--text);
}

.policy hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 64px 0;
}

/* Responsive */

@media (max-width: 640px) {
    .hero {
        padding: 64px 0 48px;
    }

    .hero h1 {
        font-size: 40px;
    }

    .hero .tagline {
        font-size: 18px;
    }

    h2 {
        font-size: 32px;
    }

    section {
        padding: 64px 0;
    }

    nav a {
        margin-left: 16px;
        font-size: 14px;
    }

    .privacy-callout {
        padding: 40px 24px;
    }
}