@import url('https://fonts.googleapis.com/css2?family=SF+Pro+Display:wght@300;400;500&display=swap');

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

:root {
    --window-bg: #ffffff;
    --window-border: rgba(0, 0, 0, 0.1);
    --window-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
    --titlebar-bg: #f5f5f5;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --nav-hover: #f0f0f0;
    --nav-active: #e8e8e8;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    background: #fafafa;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px;
}

.window {
    background: var(--window-bg);
    border-radius: 12px;
    box-shadow: var(--window-shadow);
    width: 100%;
    max-width: 720px;
    min-height: 580px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.titlebar {
    background: var(--titlebar-bg);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--window-border);
    user-select: none;
}

.traffic-lights {
    display: flex;
    gap: 8px;
}

.traffic-light {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.traffic-light.close { background: #ff5f56; }
.traffic-light.minimize { background: #ffbd2e; }
.traffic-light.maximize { background: #27c93f; }

.titlebar-title {
    flex: 1;
    text-align: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-right: 52px;
}

.window-body {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 160px;
    background: #fbfbfb;
    border-right: 1px solid var(--window-border);
    padding: 12px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-item {
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.15s ease;
    border: none;
    background: none;
    text-align: left;
    width: 100%;
    font-family: inherit;
    text-decoration: none;
    display: block;
}

.nav-item:hover { background: var(--nav-hover); }
.nav-item.active { background: var(--nav-active); font-weight: 500; }

.content {
    flex: 1;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 569px;
}

.page {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.content h1 {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin-bottom: 4px;
}

.content h2 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.content p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.content a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--text-secondary);
    transition: border-color 0.15s ease;
}

.content a:hover { border-color: var(--text-primary); }

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--window-border);
}

.feature-item:last-child { border-bottom: none; }

.feature-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}

.feature-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.kbd {
    font-size: 11px;
    color: var(--text-secondary);
    background: var(--titlebar-bg);
    border: 1px solid var(--window-border);
    padding: 2px 8px;
    border-radius: 4px;
}

.feature-item p {
    font-size: 13px;
}

.link-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 0;
    border-bottom: 1px solid var(--window-border);
    transition: color 0.15s ease;
}

.link-item:hover { color: var(--text-secondary); }
.link-item:last-child { border-bottom: none; }

.star-cta {
    display: inline-block;
    margin-top: 12px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--titlebar-bg);
    border: 1px solid var(--window-border);
    border-radius: 6px;
    text-decoration: none;
    transition: background 0.15s ease;
    align-self: flex-start;
}

.star-cta:hover { background: var(--nav-active); border-bottom: 1px solid var(--window-border); }

.privacy-section ul {
    list-style: none;
    margin-top: 8px;
}

.privacy-section ul li {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 16px;
    position: relative;
    line-height: 1.5;
}

.privacy-section ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 4px;
    height: 4px;
    background: var(--nav-active);
    border-radius: 50%;
}

.privacy-section ul li strong {
    color: var(--text-primary);
    font-weight: 500;
}

@media (max-width: 500px) {
    .window { min-height: auto; }
    .window-body { flex-direction: column; }

    .sidebar {
        width: 100%;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid var(--window-border);
        overflow-x: auto;
        padding: 8px;
    }

    .nav-item { white-space: nowrap; }
    .content { padding: 24px; }
}