/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface-2: #242836;
    --border: #2e3345;
    --text: #e8eaed;
    --text-muted: #9aa0b0;
    --accent: #6c63ff;
    --accent-hover: #7b73ff;
    --green: #34d399;
    --yellow: #fbbf24;
    --orange: #fb923c;
    --red: #f87171;
    --blue: #60a5fa;
    --radius: 8px;
    --radius-lg: 12px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 16px;
}

/* === Header === */
.site-header {
    padding: 32px 0 24px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.site-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.site-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

/* === Sections === */
section {
    margin: 32px 0;
}

section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text);
}

.section-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* === Card === */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

/* === Controls === */
.controls-row {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.input-group input,
.input-group select {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 12px;
    font-size: 1rem;
    color: var(--text);
    transition: border-color 0.2s;
}

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

/* === Results Table === */
.results-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.results-table thead th {
    text-align: left;
    padding: 10px 12px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.results-table tbody tr {
    border-bottom: 1px solid var(--border);
    transition: background 0.15s;
}

.results-table tbody tr:hover {
    background: var(--surface-2);
}

.results-table tbody td {
    padding: 10px 12px;
    white-space: nowrap;
}

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

/* === Badges === */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-best {
    background: rgba(52, 211, 153, 0.15);
    color: var(--green);
}

.badge-good {
    background: rgba(96, 165, 250, 0.15);
    color: var(--blue);
}

.badge-ok {
    background: rgba(251, 191, 36, 0.15);
    color: var(--yellow);
}

.badge-low {
    background: rgba(248, 113, 113, 0.15);
    color: var(--red);
}

.badge-cheapest {
    background: rgba(52, 211, 153, 0.15);
    color: var(--green);
}

.badge-expensive {
    background: rgba(248, 113, 113, 0.15);
    color: var(--red);
}

/* Value highlight cells */
.cell-green {
    color: var(--green);
    font-weight: 700;
}

.cell-red {
    color: var(--red);
    font-weight: 700;
}

.cell-yellow {
    color: var(--yellow);
    font-weight: 600;
}

.cell-bold {
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

/* === Quick Price Buttons === */
.quick-prices {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.quick-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    display: block;
    margin-bottom: 8px;
}

.quick-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.preset-btn {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 14px;
    font-size: 0.8125rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    border-color: var(--accent);
    color: var(--text);
}

.preset-btn.active {
    background: rgba(108, 99, 255, 0.15);
    border-color: var(--accent);
    color: var(--accent);
}

/* === Item Result === */
.item-result {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}

.item-result .result-main {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
}

.item-result .result-detail {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.item-result .result-detail strong {
    color: var(--text);
}

/* === Savings Result === */
.savings-result {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.savings-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.savings-card .savings-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.savings-card .savings-value {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.savings-card .savings-note {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.savings-green {
    color: var(--green);
}

.savings-red {
    color: var(--red);
}

.savings-yellow {
    color: var(--yellow);
}

/* === SEO Content === */
.seo-content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
}

.content-columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

.seo-content h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 20px 0 8px;
    color: var(--text);
}

.seo-content h3:first-child {
    margin-top: 0;
}

.seo-content p {
    color: var(--text-muted);
    margin-bottom: 8px;
    font-size: 0.9375rem;
    line-height: 1.7;
}

.seo-content ul {
    color: var(--text-muted);
    margin-left: 20px;
    margin-bottom: 8px;
    font-size: 0.9375rem;
    line-height: 1.7;
}

.seo-content strong {
    color: var(--text);
}

/* === Ad Slots === */
.ad-slot {
    margin: 24px 0;
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* === Footer === */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
    margin-top: 48px;
    text-align: center;
}

.site-footer p {
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.footer-note {
    margin-top: 8px;
    font-size: 0.75rem !important;
    color: var(--text-muted);
    opacity: 0.7;
}

/* === Responsive === */
@media (min-width: 480px) {
    .controls-row {
        flex-direction: row;
        align-items: flex-end;
    }

    .controls-row .input-group {
        flex: 1;
    }

    .savings-result {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 640px) {
    .container {
        padding: 0 24px;
    }

    .site-title {
        font-size: 2rem;
    }

    .savings-result {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 900px) {
    .content-columns {
        grid-template-columns: 1fr 1fr;
    }

    .site-header {
        padding: 48px 0 32px;
    }

    .site-title {
        font-size: 2.25rem;
    }

    section {
        margin: 40px 0;
    }
}