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

:root {
    --bg: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #1e293b;
    --link-color: #2563eb;
    --link-bg: #ffffff;
    --link-hover-bg: #f1f5f9;
    --link-border: #e2e8f0;
    --button-bg: #e2e8f0;
    --button-hover-bg: #cbd5e1;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --transition: all 0.2s ease;
    --transparent: 0.75;
}

body.dark {
    --bg: #0a0c10;
    --text-primary: #edf2f7;
    --text-secondary: #cbd5e6;
    --link-color: #7aa9ff;
    --link-bg: #141a24;
    --link-hover-bg: #1f2a3a;
    --link-border: #2d3748;
    --button-bg: #2d3748;
    --button-hover-bg: #3b4a5f;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --transparent: 0.9;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    min-height: 100vh;
    padding: 1rem;
    transition: background-color 0.25s ease, color 0.2s ease;
    display: flex;
}

main {
    max-width: 680px;
    width: 100%;
    margin: 0 auto;
    padding: 1rem;
    background-position: center;
    border-radius: 2rem;
    display: flex;
    flex-direction: column;
}

main > * {
    flex-shrink: 0;
}

.header {
    display: flex;
    background-color: rgba(from var(--link-bg) r g b / var(--transparent));
    border-radius: 2rem;
    margin-bottom: 2.5rem;
    backdrop-filter: blur(2px);
    border: 2px solid var(--link-color);
    user-select: none;
    -webkit-user-select: none;
    text-decoration: none;
}

.title {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--link-color) 80%);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.02);
    width: 100%;
    text-align: center;
}

button {
    background: var(--button-bg);
    border: none;
    border-radius: 1.25rem;
    padding: 0.5rem 1.2rem;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    transition: var(--transition);
    backdrop-filter: blur(2px);
    box-shadow: var(--shadow-sm);
}

button:hover {
    background: var(--button-hover-bg);
}

button:active {
    transform: scale(0.96);
}

.links-section {
    margin-top: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.link-card {
    display: block;
    background-color: rgba(from var(--link-bg) r g b / var(--transparent));
    border: 1px solid var(--link-border);
    border-radius: 1.25rem;
    padding: 1rem 1.5rem;
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(2px);
    position: relative;
}

.link-card:hover {
    background-color: rgba(from var(--link-hover-bg) r g b / var(--transparent));
    transform: translateY(-0.25rem);
    border-color: var(--link-color);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.08);
}

.link-card::after {
    content: "→";
    float: right;
    opacity: 0.6;
    transition: transform 0.2s, opacity 0.2s;
    font-size: 1.1rem;
}

.link-card-disabled {
    display: block;
    background-color: rgba(from var(--link-bg) r g b / var(--transparent));
    border: 1px solid var(--link-border);
    border-radius: 1.25rem;
    padding: 1rem 1.5rem;
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(2px);
    position: relative;
}

footer {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

@media (max-width: 560px) {
    main {
        padding: 0.5rem;
    }
    .title {
        font-size: 3.6rem;
    }
    .link-card {
        padding: 0.85rem 1.2rem;
        font-size: 1rem;
    }
    button {
        padding: 0.4rem 1rem;
        font-size: 0.85rem;
    }
    .header {
        margin-bottom: 1.8rem;
    }
}

@media (max-width: 420px) {
    .title {
        font-size: 3.4rem;
    }
    .link-card {
        padding: 0.75rem 1rem;
    }
    body {
        padding: 0;
    }
    main {
        border-radius: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}