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

:root {
    --bg: #0d0d0d;
    --surface: #181818;
    --surface2: #222222;
    --border: #2e2e2e;
    --accent: #c8ff00;
    --accent-dim: #8fbb00;
    --text: #f0f0f0;
    --text-muted: #888;
    --text-dim: #555;
    --danger: #ff4d4d;
    --radius: 10px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Barlow', sans-serif;
    font-size: 15px;
    min-height: 100vh;
    padding: 0 0 3rem;
}

header {
    padding: 2rem 1.25rem 1.25rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

header h1 {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 800;
    font-size: clamp(2rem, 7vw, 2.8rem);
    letter-spacing: -0.5px;
    line-height: 1;
    color: var(--text);
}

header h1 span {
    color: var(--accent);
}

header p {
    margin-top: 0.4rem;
    color: var(--text-muted);
    font-size: 13px;
    letter-spacing: 0.3px;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.section-label {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="text"],
input[type="number"] {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.4rem;
    font-weight: 600;
    padding: 0.6rem 0.9rem;
    width: 100%;
    outline: none;
    transition: border-color 0.15s;
    -webkit-appearance: none;
    appearance: none;
}

input[type="text"]:focus,
input[type="number"]:focus {
    border-color: var(--accent);
}

input[type="text"].error {
    border-color: var(--danger);
}

input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.input-hint {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 0.5rem;
}

.quick-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 0.75rem;
}

.quick-btn {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 600;
    font-size: 14px;
    padding: 5px 13px;
    cursor: pointer;
    transition: all 0.12s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.quick-btn:active {
    transform: scale(0.93);
}

.quick-btn.active,
.quick-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #000;
}

.vila-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.vila-toggle input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}

.vila-toggle span {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.3px;
}

.vila-field {
    margin-top: 1rem;
    display: none;
    animation: fadeIn 0.2s ease;
}

.vila-field.visible {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calc-btn {
    width: 100%;
    background: var(--accent);
    border: none;
    border-radius: var(--radius);
    color: #000;
    cursor: pointer;
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: 1px;
    padding: 1rem;
    margin-top: 0.5rem;
    transition: all 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.calc-btn:hover {
    background: #d6ff1a;
}

.calc-btn:active {
    transform: scale(0.97);
    background: var(--accent-dim);
}

.error-msg {
    background: rgba(255, 77, 77, 0.1);
    border: 1px solid rgba(255, 77, 77, 0.3);
    border-radius: 7px;
    color: var(--danger);
    font-size: 13px;
    padding: 0.6rem 0.9rem;
    margin-top: 0.75rem;
    display: none;
}

.error-msg.visible {
    display: block;
}

.results {
    margin-top: 1.5rem;
    display: none;
}

.results.visible {
    display: block;
}

.results-header {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.table-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
}

thead tr {
    background: var(--surface2);
    border-bottom: 1px solid var(--border);
}

thead th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.8px;
    padding: 0.7rem 0.9rem;
    text-align: left;
    font-family: 'Barlow Condensed', sans-serif;
    text-transform: uppercase;
}

tbody tr {
    border-bottom: 1px solid var(--border);
    transition: background 0.1s;
}

tbody tr:last-child {
    border-bottom: none;
}

tbody tr:hover {
    background: var(--surface2);
}

tbody td {
    padding: 0.75rem 0.9rem;
    font-weight: 400;
}

tbody td:first-child {
    font-weight: 600;
    color: var(--accent);
    font-size: 14px;
}

.total-row {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-top: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.total-label {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-muted);
}

.total-value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--accent);
}

.stats-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 0.75rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem 1rem;
}

.stat-card .label {
    font-size: 11px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-dim);
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-card .value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--text);
}

@media (min-width: 480px) {
    header {
        padding: 2.5rem 2rem 1.5rem;
    }

    .container {
        padding: 0 2rem;
    }
}