:root {
    color-scheme: dark;
    font-family: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --panel: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.1);
    --accent: #f6c177;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top, #1d1b28, #0c0b13 70%);
    color: #f7f7f7;
    padding: 24px;
}

main {
    width: min(960px, 100%);
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    backdrop-filter: blur(16px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

h1 {
    margin: 0 0 12px;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
}

p {
    margin: 4px 0;
    line-height: 1.4;
    color: #d9d7e8;
}

.info {
    margin-bottom: 24px;
    font-size: 0.98rem;
}

.actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.order-toggle {
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(246, 193, 119, 0.2);
    color: #f7f7f7;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 150ms ease, transform 120ms ease;
}

.order-toggle:hover {
    background: rgba(246, 193, 119, 0.3);
}

.order-toggle:active {
    transform: scale(0.97);
}

.inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
}

label span {
    font-size: 0.95rem;
    color: #c2c0d4;
}

.unit-picker {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    padding: 8px 12px;
}

.unit-picker summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    color: #c2c0d4;
}

.unit-picker summary::-webkit-details-marker {
    display: none;
}

.unit-picker summary::after {
    content: ">";
    font-size: 0.85rem;
    color: #c2c0d4;
    transition: transform 150ms ease;
}

.unit-picker[open] summary::after {
    transform: rotate(90deg);
}

.unit-picker .unit-selection {
    font-weight: 600;
    color: #f7f7f7;
}

.unit-picker[open] {
    padding-bottom: 12px;
}

.unit-picker[open] .unit-buttons {
    margin-top: 12px;
}

.unit-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 8px;
}

.unit-buttons button {
    padding: 8px 10px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
    color: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 120ms ease, transform 120ms ease;
}

.unit-buttons button:hover {
    background: rgba(255, 255, 255, 0.16);
}

.unit-buttons button:active {
    transform: scale(0.97);
}

.unit-buttons button.active {
    border-color: var(--accent);
    background: rgba(246, 193, 119, 0.25);
    color: var(--accent);
}

input[type="text"] {
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.2);
    color: inherit;
    font-size: 1.05rem;
}

input[type="text"]::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.result {
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 14px;
    background: rgba(17, 16, 28, 0.6);
}

.result h2 {
    margin: 0 0 8px;
    font-size: 1.1rem;
    color: var(--accent);
    letter-spacing: 0.02em;
}

.big-number {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    margin: 4px 0 12px;
    font-weight: 600;
}

.hint {
    font-size: 0.9rem;
    opacity: 0.8;
}

.status {
    font-size: 0.95rem;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(246, 193, 119, 0.15);
    color: var(--accent);
}

@media (max-width: 600px) {
    body {
        padding: 12px;
    }

    main {
        padding: 24px 18px;
    }
}