:root {
    color-scheme: light dark;
    --bg: #0f172a;
    --card: rgba(255, 255, 255, 0.08);
    --card-border: rgba(255, 255, 255, 0.18);
    --text: #f8fafc;
    --muted: #cbd5e1;
    --primary: #38bdf8;
    --primary-hover: #0ea5e9;
    --error: #f87171;
    --success: #86efac;
    --input: rgba(15, 23, 42, 0.72);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.28), transparent 32rem),
        radial-gradient(circle at bottom right, rgba(168, 85, 247, 0.22), transparent 30rem),
        var(--bg);
    color: var(--text);
}

.app {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.card {
    width: min(720px, 100%);
    padding: 28px;
    border: 1px solid var(--card-border);
    border-radius: 28px;
    background: var(--card);
    backdrop-filter: blur(18px);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

.topbar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 28px;
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1;
    letter-spacing: -0.05em;
}

p {
    margin: 0;
}

.topbar p,
.hint {
    color: var(--muted);
    margin-top: 8px;
}

select,
textarea,
input {
    width: 100%;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 16px;
    background: var(--input);
    color: var(--text);
    padding: 14px 16px;
    font: inherit;
    outline: none;
}

select {
    width: auto;
    cursor: pointer;
}

textarea {
    resize: vertical;
    min-height: 180px;
}

textarea:focus,
input:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.16);
}

.form {
    display: grid;
    gap: 18px;
}

label {
    display: grid;
    gap: 8px;
    font-weight: 700;
}

button {
    border: 0;
    border-radius: 16px;
    background: var(--primary);
    color: #082f49;
    padding: 14px 18px;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
    transition: 160ms ease;
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.result {
    margin-top: 20px;
    padding: 18px;
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(15, 23, 42, 0.6);
}

.result.success {
    border-color: rgba(134, 239, 172, 0.35);
}

.result.error {
    border-color: rgba(248, 113, 113, 0.5);
    color: var(--error);
}

.share-url {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.share-url input {
    flex: 1;
}

.share-url button {
    white-space: nowrap;
}

pre {
    white-space: pre-wrap;
    word-break: break-word;
    margin: 12px 0 0;
    font: inherit;
    color: var(--text);
}

.hidden {
    display: none;
}

@media (max-width: 640px) {
    .card {
        padding: 20px;
        border-radius: 22px;
    }

    .topbar {
        flex-direction: column;
    }

    select {
        width: 100%;
    }

    .share-url {
        flex-direction: column;
    }
}