:root {
    color-scheme: dark;
    --bg-dark: #0b0c10;
    --bg-panel: #1f2833;
    --accent: #6600f1;
    --accent-muted: #45009e;
    --text-light: #f0f5f4;
    --text-muted: #c5c6c7;
}

body.bg-dark {
    background-color: var(--bg-dark);
    color: var(--text-light);
    font-family: 'Inter', 'Segoe UI', sans-serif;
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem;
}

header.container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 1rem;
    font-size: 0.95rem;
}

header nav a:hover {
    color: var(--accent);
}

.brand a {
    font-size: 1.3rem;
    color: var(--text-light);
    text-decoration: none;
    letter-spacing: 0.05em;
}

.brand span {
    color: var(--accent);
}

main.container {
    flex: 1 0 auto;
}

.footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.panel {
    background: var(--bg-panel);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 15px 45px rgba(0,0,0,0.25);
}

.panel h1, .panel h2 {
    color: var(--accent);
    margin-top: 0;
}

.markdown p, .panel p {
    line-height: 1.6;
    color: var(--text-muted);
}

a {
    color: var(--accent);
}

a:hover {
    color: var(--accent-muted);
}

form {
    display: grid;
    gap: 1rem;
}

label {
    display: grid;
    gap: 0.25rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

input, textarea, button {
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.08);
    padding: 0.75rem 1rem;
    background: rgba(255,255,255,0.04);
    color: var(--text-light);
    font-size: 0.95rem;
}

input:focus, textarea:focus {
    outline: 2px solid var(--accent);
    border-color: var(--accent);
}

button {
    cursor: pointer;
    background: linear-gradient(135deg, var(--accent), var(--accent-muted));
    border: none;
    font-weight: 600;
    letter-spacing: 0.05em;
}

button:hover {
    filter: brightness(1.1);
}

.form-panel {
    max-width: 480px;
    margin: 0 auto;
}

.flag-mint {
    border: 1px solid rgba(102, 0, 241, 0.3);
    border-radius: 12px;
    padding: 1rem;
    background: rgba(102, 0, 241, 0.08);
    display: grid;
    gap: 0.75rem;
}

.flag-fields {
    display: grid;
    gap: 0.75rem;
}

.flag-fields button {
    justify-self: start;
}

@media (min-width: 600px) {
    .flag-fields {
        grid-template-columns: 1fr auto;
        align-items: end;
    }
    .flag-fields button {
        justify-self: end;
    }
}

.grid {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.error {
    color: #ff8a80;
}

.info {
    color: var(--accent);
}

.hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.challenges-panel > p {
    margin-bottom: 0.75rem;
}

.challenge-grid {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.challenge-card {
    background: rgba(255,255,255,0.03);
    border-radius: 16px;
    padding: 1.75rem;
    border: 1px solid rgba(102,0,241,0.2);
    box-shadow: 0 25px 60px rgba(0,0,0,0.25);
}

.challenge-header > h2 {
    margin-bottom: 0.5rem;
}

.challenge-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.tag {
    display: inline-flex;
    align-items: center;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: rgba(102,0,241,0.18);
    color: var(--text-light);
}

.tag.subtle {
    background: rgba(255,255,255,0.08);
    color: var(--text-muted);
}

.challenge-columns {
    display: grid;
    gap: 1.5rem;
    margin: 1.25rem 0;
}

.challenge-columns h3 {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.challenge-columns ul,
.challenge-columns ol {
    margin: 0;
    padding-left: 1.2rem;
    color: var(--text-muted);
}

.artifact-grid {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.artifact h4 {
    margin-bottom: 0.5rem;
    color: var(--accent);
}

.artifact pre {
    background: rgba(0,0,0,0.35);
    border-radius: 10px;
    padding: 1rem;
    overflow-x: auto;
}

.artifact code {
    color: var(--text-light);
    font-family: 'Fira Code', 'Source Code Pro', monospace;
    font-size: 0.85rem;
}

.palette {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.swatch {
    border-radius: 12px;
    padding: 1.25rem 0.75rem;
    background: var(--bg-panel);
    border: 1px solid rgba(255,255,255,0.1);
    position: relative;
}

.swatch::before {
    content: "";
    position: absolute;
    inset: 0.4rem;
    border-radius: 8px;
    background: var(--swatch-color);
    opacity: 0.9;
}

.swatch span {
    position: relative;
    display: block;
    font-family: 'Fira Code', 'Source Code Pro', monospace;
    font-size: 0.8rem;
    text-align: center;
}

.challenge-footer {
    border-top: 1px solid rgba(255,255,255,0.08);
    margin-top: 1.5rem;
    padding-top: 1.25rem;
}

.challenge-footer p {
    margin: 0.25rem 0;
}

.challenge-footer .lore {
    color: var(--text-muted);
    font-style: italic;
}

@media (min-width: 768px) {
    .challenge-columns {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .artifact-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}