:root {
    --bg: #ffffff;
    --bg-secondary: #f5f5f7;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent: #0071e3;
    --accent-hover: #0077ed;
    --border: #d2d2d7;
    --card-bg: #ffffff;
    --shadow: rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1d1d1f;
        --bg-secondary: #2d2d2f;
        --text: #f5f5f7;
        --text-secondary: #a1a1a6;
        --accent: #2997ff;
        --accent-hover: #4faaff;
        --border: #424245;
        --card-bg: #2d2d2f;
        --shadow: rgba(0, 0, 0, 0.2);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 24px 60px;
}

.container {
    max-width: 640px;
    width: 100%;
}

.page-nav {
    margin-bottom: 24px;
}

.page-nav a,
footer a {
    color: var(--accent);
    text-decoration: none;
}

header {
    text-align: center;
    margin-bottom: 48px;
}

.app-icon {
    width: 96px;
    height: 96px;
    margin-bottom: 20px;
    border-radius: 18px;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 460px;
    margin: 0 auto;
}

.features {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 24px;
    flex-wrap: wrap;
}

.feature-badge {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.download-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 2px 12px var(--shadow);
    margin-bottom: 32px;
}

.download-card h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.version-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.version-row label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-width: 60px;
}

.version-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

select {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text);
    font-size: 0.9rem;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236e6e73' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    justify-content: center;
    padding: 14px 24px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

.download-btn:hover {
    background: var(--accent-hover);
}

.download-meta {
    display: flex;
    justify-content: space-between;
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.release-notes {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 2px 12px var(--shadow);
    margin-bottom: 32px;
}

.release-notes h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.release-notes-body {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.release-notes-body h3,
.release-notes-body h4,
.release-notes-body h5 {
    color: var(--text);
    margin-top: 16px;
    margin-bottom: 8px;
    font-weight: 600;
}

.release-notes-body h3 { font-size: 1.05rem; }
.release-notes-body h4 { font-size: 0.95rem; }
.release-notes-body h5 { font-size: 0.9rem; }

.release-notes-body p {
    margin-bottom: 8px;
}

.release-notes-body ul {
    margin: 8px 0;
    padding-left: 20px;
}

.release-notes-body li {
    margin-bottom: 4px;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

footer {
    margin-top: 48px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.loading {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
}

@media (max-width: 640px) {
    body {
        padding: 28px 16px 40px;
    }

    .download-card,
    .release-notes {
        padding: 24px;
    }

    .download-meta,
    .version-row {
        flex-direction: column;
        align-items: flex-start;
    }
}