:root {
    --bg-color: #0F0F1A;
    --panel-bg: #1A1A24;
    --primary: #3498DB;
    --primary-hover: #2980b9;
    --accent: #2ECC71;
    --accent-negative: #E74C3C;
    --text-main: #FFFFFF;
    --text-muted: #8B949E;
    --border: #2C3E50;
    --font-family: 'Inter', system-ui, sans-serif;
    --border-radius: 12px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.bg-gradient {
    position: fixed;
    top: -20%;
    left: -10%;
    width: 50%;
    height: 50%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.top-nav {
    background: rgba(15, 15, 26, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
}

.logo-text strong {
    color: var(--primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
    flex: 1;
    width: 100%;
    position: relative;
    z-index: 1;
}

.grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 24px;
    align-items: start;
}

.panel {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
}

.input-group {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-group label {
    font-size: 13px;
    color: var(--text-muted);
}

input[type="text"],
input[type="number"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 10px 12px;
    border-radius: 8px;
    font-family: var(--font-family);
    font-size: 15px;
    transition: all 0.2s ease;
    outline: none;
}

input[type="text"]:focus,
input[type="number"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.separator {
    height: 1px;
    background: var(--border);
    margin: 24px 0;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
    cursor: pointer;
}

.range-val {
    font-size: 13px;
    text-align: right;
    color: var(--primary);
    font-weight: 600;
    margin-top: -4px;
}

/* Results panel */
.results-panel {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.conclusion-box {
    background: rgba(46, 204, 113, 0.1);
    border-left: 4px solid var(--accent);
    padding: 20px;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    transition: all 0.3s ease;
}

.conclusion-box.buy-better {
    background: rgba(46, 204, 113, 0.1);
    border-left-color: var(--accent);
}

.conclusion-box.rent-better {
    background: rgba(52, 152, 219, 0.1);
    border-left-color: var(--primary);
}

#verdict {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 6px;
}

.buy-better #verdict {
    color: var(--accent);
}

.rent-better #verdict {
    color: var(--primary);
}

#verdict-sub {
    color: var(--text-muted);
    font-size: 14px;
}

.chart-container {
    width: 100%;
    height: 300px;
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.result-card {
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
}

.rc-title {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.buy-card .rc-title {
    color: var(--accent);
}

.rent-card .rc-title {
    color: var(--primary);
}

.rc-val {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 4px;
}

.rc-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.rc-details {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.rc-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}

.rc-row span:last-child {
    font-weight: 600;
    color: var(--text-main);
}

.mt-1 {
    margin-top: 16px;
}

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