:root {
    --primary: #7C4DFF;
    --primary-container: #2A1B5E;
    --secondary: #00E5FF;
    --tertiary: #FF6E40;
    --bg: #0D0D1A;
    --surface: #161625;
    --surface-variant: #1E1E30;
    --on-surface: #E8E8F0;
    --on-surface-dim: #8888A0;
    --on-primary-container: #D4BBFF;
    --error: #FF5252;
    --success: #69F0AE;
    --warning: #FFB74D;
    --warning-bg: #2A1F0E;
    --warning-border: #5C3D0A;
    --outline: #333350;
    --radius: 16px;
    --radius-sm: 12px;
    --radius-xs: 10px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--on-surface);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ─── Page Layout ─── */
.page {
    max-width: 640px;
    margin: 0 auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ─── Hero ─── */
.hero {
    text-align: center;
    padding: 40px 16px 16px;
}
.logo-img {
    width: 260px;
    height: 260px;
    filter: drop-shadow(0 0 40px rgba(124, 77, 255, 0.5)) drop-shadow(0 0 80px rgba(0, 229, 255, 0.25));
    margin-bottom: 20px;
}
.tagline {
    color: var(--on-surface-dim);
    font-size: 1rem;
}

/* ─── Cards ─── */
.card {
    background: var(--surface-variant);
    border-radius: var(--radius);
    padding: 20px;
}
.card h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.card h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--on-surface-dim);
    letter-spacing: 0.8px;
    margin-bottom: 12px;
}
.card .description {
    font-size: 0.92rem;
    color: var(--on-surface-dim);
    line-height: 1.6;
    margin-bottom: 20px;
}

/* ─── Download Button ─── */
.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--primary), #6200EA);
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.15s, transform 0.1s, box-shadow 0.15s;
    box-shadow: 0 4px 20px rgba(124, 77, 255, 0.3);
}
.download-btn:hover {
    opacity: 0.9;
    box-shadow: 0 6px 28px rgba(124, 77, 255, 0.45);
}
.download-btn:active {
    transform: scale(0.98);
}
.download-btn.unavailable {
    background: var(--surface);
    color: var(--on-surface-dim);
    box-shadow: none;
    cursor: not-allowed;
    border: 1px solid var(--outline);
}
.download-icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}
.download-meta {
    font-size: 0.82rem;
    color: var(--on-surface-dim);
    margin-top: 10px;
    text-align: center;
}

/* ─── Requirements ─── */
.requirements {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--outline);
}
.requirements ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.requirements li {
    font-size: 0.88rem;
    color: var(--on-surface-dim);
    padding-left: 20px;
    position: relative;
}
.requirements li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: var(--secondary);
}

/* ─── Warning Card ─── */
.warning-card {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
}
.warning-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}
.warning-header h3 {
    margin-bottom: 0;
    color: var(--warning);
    text-transform: none;
    font-size: 0.95rem;
    letter-spacing: 0;
}
.warning-icon {
    width: 22px;
    height: 22px;
    color: var(--warning);
    flex-shrink: 0;
}
.warning-body p {
    font-size: 0.88rem;
    color: var(--on-surface);
    line-height: 1.65;
    margin-bottom: 12px;
    opacity: 0.85;
}
.warning-body ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
    padding-left: 4px;
}
.warning-body li {
    font-size: 0.85rem;
    color: var(--on-surface);
    opacity: 0.8;
    padding-left: 18px;
    position: relative;
    line-height: 1.5;
}
.warning-body li::before {
    content: "⚠";
    position: absolute;
    left: 0;
    font-size: 0.75rem;
}
.source-note {
    font-size: 0.82rem !important;
    color: var(--success) !important;
    opacity: 0.9 !important;
    font-style: italic;
    border-top: 1px solid var(--warning-border);
    padding-top: 12px;
    margin-bottom: 0 !important;
}

/* ─── Steps ─── */
.steps {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-container);
    color: var(--on-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}
.step-text {
    font-size: 0.88rem;
    color: var(--on-surface-dim);
    line-height: 1.55;
    padding-top: 4px;
}
.step-text strong {
    color: var(--on-surface);
}
.step-text code {
    background: var(--surface);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.82rem;
    color: var(--primary);
}

/* ─── Footer ─── */
.footer {
    text-align: center;
    padding: 20px 0 32px;
    font-size: 0.78rem;
    color: var(--on-surface-dim);
    opacity: 0.6;
}

/* ─── Responsive ─── */
@media (max-width: 400px) {
    .page { padding: 10px; }
    .hero { padding-top: 24px; }
    .logo-img { width: 200px; height: 200px; }
    .download-btn { font-size: 1rem; padding: 14px 20px; }
}