:root {
    --bg-start: #0d0a1e;
    --bg-end:   #1a1438;
    --glow:     #4f48e0;
    --card-bg:  rgba(28, 24, 60, 0.88);
    --card-border: rgba(108, 99, 255, 0.28);
    --text-primary: #f0f0f5;
    --text-secondary: #b0a8d6;
    --accent: #6C63FF;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background: radial-gradient(60% 50% at 50% 0%, rgba(79, 72, 224, 0.35) 0%, transparent 60%),
                linear-gradient(180deg, var(--bg-start), var(--bg-end));
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 48px 24px;
}

.content {
    width: min(780px, 100%);
    border-radius: 20px;
    border: 1px solid var(--card-border);
    background: linear-gradient(180deg, rgba(40, 32, 84, 0.92), var(--card-bg));
    box-shadow: 0 26px 56px rgba(0, 0, 0, 0.5);
    padding: 32px;
    backdrop-filter: blur(6px);
}

.back {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    margin-bottom: 16px;
    transition: color 140ms;
}
.back:hover { color: var(--text-primary); }

h1 {
    margin: 0 0 8px;
    font-size: clamp(26px, 4vw, 38px);
    letter-spacing: -0.01em;
}
h2 { font-size: 1.15rem; margin: 28px 0 8px; }
h3 { font-size: 1.02rem; margin: 20px 0 6px; }

.meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

p, li {
    line-height: 1.7;
    color: var(--text-secondary);
    font-size: 0.98rem;
}

strong { color: var(--text-primary); }
ul { padding-left: 20px; }
a { color: var(--accent); }

/* home page */
body.home { align-items: center; }

.home-card {
    width: min(560px, 100%);
    text-align: center;
    border-radius: 22px;
    border: 1px solid var(--card-border);
    background: linear-gradient(180deg, rgba(40, 32, 84, 0.92), var(--card-bg));
    box-shadow: 0 26px 56px rgba(0, 0, 0, 0.5);
    padding: 40px 32px 32px;
    backdrop-filter: blur(6px);
}

.home-card h1 {
    font-size: clamp(32px, 6vw, 44px);
    margin-bottom: 12px;
}

.link-list {
    display: grid;
    gap: 10px;
    margin-top: 28px;
    text-align: left;
}

.home-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 18px;
    border-radius: 14px;
    border: 1px solid rgba(108, 99, 255, 0.18);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    transition: background 140ms, border-color 140ms, transform 140ms;
}
.home-link:hover {
    background: rgba(108, 99, 255, 0.10);
    border-color: rgba(108, 99, 255, 0.4);
    transform: translateY(-1px);
}
.home-link .arrow {
    color: var(--accent);
    transition: transform 140ms;
}
.home-link:hover .arrow { transform: translateX(3px); }

.footer {
    color: var(--text-secondary);
    font-size: 0.82rem;
    margin-top: 28px;
}

@media (max-width: 560px) {
    body { padding: 14px; }
    .content, .home-card { padding: 22px; border-radius: 16px; }
}