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

:root {
    --bg: #ffffff;
    --bg-secondary: #f5f5f7;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent: #0071e3;
    --accent-hover: #0077ed;
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.08);
    --hero-gradient: linear-gradient(180deg, #fbfbfd 0%, #f5f5f7 100%);
    --feature-icon-bg: #f5f5f7;
    --footer-bg: #f5f5f7;
    --footer-border: #d2d2d7;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #000000;
        --bg-secondary: #1d1d1f;
        --text: #f5f5f7;
        --text-secondary: #a1a1a6;
        --accent: #2997ff;
        --accent-hover: #4dabff;
        --card-bg: #1d1d1f;
        --card-border: rgba(255, 255, 255, 0.1);
        --hero-gradient: linear-gradient(180deg, #000000 0%, #1d1d1f 100%);
        --feature-icon-bg: #2d2d2d;
        --footer-bg: #1d1d1f;
        --footer-border: #424245;
        --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    }
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-hover);
}

/* ===== Layout ===== */
.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navigation ===== */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--card-border);
}

@media (prefers-color-scheme: dark) {
    .nav {
        background: rgba(0, 0, 0, 0.72);
    }
}

.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
}

.nav-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
    list-style: none;
}

.nav-links a {
    font-size: 14px;
    color: var(--text-secondary);
}

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

/* ===== Hero ===== */
.hero {
    background: var(--hero-gradient);
    text-align: center;
    padding: 80px 24px 60px;
    overflow: hidden;
}

.hero-icon {
    width: 120px;
    height: 120px;
    border-radius: 26px;
    margin: 0 auto 32px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-badges {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.badge-appstore {
    display: inline-block;
    height: 44px;
    transition: opacity 0.2s;
}

.badge-appstore:hover {
    opacity: 0.8;
}

.badge-appstore img {
    height: 44px;
}

/* ===== Screenshots ===== */
.screenshots {
    padding: 40px 0 80px;
    overflow: hidden;
}

.screenshots h2 {
    text-align: center;
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 40px;
}

.screenshot-scroll {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 0 24px 20px;
    scrollbar-width: none;
}

.screenshot-scroll::-webkit-scrollbar {
    display: none;
}

.screenshot-scroll img {
    flex-shrink: 0;
    width: 220px;
    height: auto;
    border-radius: 20px;
    scroll-snap-align: center;
    box-shadow: var(--shadow);
}

@media (min-width: 768px) {
    .screenshot-scroll {
        justify-content: center;
        flex-wrap: nowrap;
    }
    .screenshot-scroll img {
        width: 200px;
    }
}

/* ===== Features ===== */
.features {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.features h2 {
    text-align: center;
    font-size: 40px;
    font-weight: 600;
    margin-bottom: 16px;
}

.features-lead {
    text-align: center;
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 60px;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 32px;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--feature-icon-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

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

@media (max-width: 600px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Footer ===== */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--footer-border);
    padding: 24px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-copy {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== Privacy Policy Page ===== */
.privacy {
    padding: 60px 24px 80px;
    max-width: 680px;
    margin: 0 auto;
}

.privacy h1 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 8px;
}

.privacy-date {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.privacy h2 {
    font-size: 24px;
    font-weight: 600;
    margin: 36px 0 12px;
}

.privacy p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

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

.privacy li {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 18px;
    }
    .features h2 {
        font-size: 28px;
    }
    .privacy h1 {
        font-size: 28px;
    }
}