*,
*::before,
*::after {
    box-sizing: border-box;
}

:root {
    --bg: #050505;
    --surface: #121212;
    --border: #2a1a1a;
    --text: #f5f5dc;
    --muted: #9a8a7a;
    --accent: #8b0000;
    --accent-hover: #a52a2a;
    --accent-glow: rgba(139, 0, 0, 0.45);
    --success: #22c55e;
    --error: #ef4444;
    --radius: 12px;
    --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font);
    background:
        radial-gradient(ellipse at 50% 0%, rgba(139, 0, 0, 0.18) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 69, 0, 0.08) 0%, transparent 40%),
        var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.page {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.brand-logo {
    display: block;
    width: min(280px, 72vw);
    height: auto;
    border-radius: 8px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
}

.site-name {
    margin: 0;
}

.site-title {
    margin: 0;
    font-size: clamp(2.25rem, 8vw, 3.5rem);
    font-weight: 900;
    letter-spacing: -0.05em;
    line-height: 1;
    background: linear-gradient(90deg, #8b0000, #ff4500, #ffd700);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 12px var(--accent-glow));
}

.site-domain {
    margin: 0.35rem 0 0;
    font-size: 1.1rem;
    color: var(--muted);
    letter-spacing: 0.35em;
    text-indent: 0.35em;
}

.tagline {
    margin: 0;
    color: var(--muted);
    font-size: 1.05rem;
}

.main {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.95rem;
}

.alert-success {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.35);
    color: #86efac;
}

.alert-error {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: #fca5a5;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
}

.card h2 {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
}

.card-desc {
    margin: 0 0 1.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.file-label {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.5rem;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.file-label:hover {
    border-color: var(--accent);
    background: rgba(139, 0, 0, 0.08);
}

.file-label input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.file-label-text {
    color: var(--accent);
    font-weight: 500;
}

.file-name {
    margin: 0;
    font-size: 0.875rem;
    color: var(--muted);
    word-break: break-all;
}

.field-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.field-label .optional {
    font-weight: 400;
    color: var(--muted);
}

.field-input {
    width: 100%;
    padding: 0.7rem 0.85rem;
    font: inherit;
    font-size: 0.95rem;
    color: var(--text);
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: border-color 0.2s;
}

.field-input::placeholder {
    color: var(--muted);
    opacity: 0.75;
}

.field-input:focus {
    outline: none;
    border-color: var(--accent);
}

.field-textarea {
    resize: vertical;
    min-height: 7rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

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

.btn:active {
    transform: translateY(1px);
}

.btn-inline {
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

.error-card {
    text-align: center;
}

.error-card h1 {
    margin: 0 0 0.75rem;
    font-size: 1.5rem;
}

.error-code {
    margin: 0 0 0.5rem;
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.04em;
    background: linear-gradient(90deg, #8b0000, #ff4500, #ffd700);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 12px var(--accent-glow));
}

.error-card .card-desc {
    margin-bottom: 1.5rem;
}

.brand a {
    display: block;
    line-height: 0;
}

.legal {
    padding: 1rem 1.1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.2);
}

.legal h3 {
    margin: 0 0 0.6rem;
    font-size: 0.95rem;
    color: var(--text);
}

.legal p {
    margin: 0 0 0.85rem;
    font-size: 0.8rem;
    line-height: 1.55;
    color: var(--muted);
}

.license-label {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.85rem;
    color: var(--text);
    cursor: pointer;
}

.license-label input {
    margin-top: 0.2rem;
    flex-shrink: 0;
    accent-color: var(--accent);
}

.info {
    padding: 0 0.25rem;
}

.info h3 {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    color: var(--muted);
}

.info ul {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.info li + li {
    margin-top: 0.35rem;
}

.footer {
    margin-top: 3rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--muted);
}

.footer p {
    margin: 0;
}

@media (max-width: 480px) {
    .brand-logo {
        width: min(220px, 80vw);
    }

    .card {
        padding: 1.25rem;
    }
}