:root {
    --bg: #08090b;
    --bg-deep: #030405;
    --surface: #0e1117;
    --panel: #141920;
    --border: #1e2730;
    --amber: #f0a500;
    --amber-d: #b07800;
    --amber-l: #ffc947;
    --gold: #D4AF37;
    --text: #c4d4de;
    --muted: #4e5f6a;
    --dim: #2a3540;
    --red: #ff4d4d;
    --green: #4ade80;
    --cyan: #00d4ff;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.5;
    padding: 2rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 1rem;
    letter-spacing: 2px;
}

.logo-icon {
    color: var(--amber);
    font-size: 1.25rem;
}

.logo-text span {
    color: var(--muted);
}

.badge {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 40px;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    display: flex;
    align-items: center;
    gap: 6px;
}

.badge-icon {
    font-size: 0.875rem;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--muted);
    margin-bottom: 2rem;
    font-size: 0.875rem;
}

/* Tooltip */
.tooltip {
    border-bottom: 1px dotted var(--amber);
    cursor: help;
}

/* Two-column layout */
.two-column {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    gap: 1.5rem;
}

/* Phase Cards */
.phase-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem;
    margin-bottom: 1.25rem;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.phase-number {
    background: var(--amber);
    color: #000;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
}

.phase-header h2 {
    font-size: 1rem;
    font-weight: 600;
    flex: 1;
}

.phase-weight {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--amber);
    background: rgba(240, 165, 0, 0.1);
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.param-group label {
    font-size: 0.8rem;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
}

.param-value {
    color: var(--amber);
    font-family: var(--font-mono);
}

.assumption-badge {
    font-size: 0.6rem;
    color: var(--muted);
    background: rgba(78, 95, 106, 0.2);
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

input[type="range"] {
    width: 100%;
    height: 3px;
    background: var(--dim);
    border-radius: 3px;
    -webkit-appearance: none;
}

input[type="range"]:focus {
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--amber);
    cursor: pointer;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.6rem;
    color: var(--muted);
    margin-top: -0.5rem;
}

.note {
    font-size: 0.7rem;
    color: var(--muted);
    text-align: right;
}

/* Toggle Buttons */
.toggle-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.toggle-btn {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 40px;
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.toggle-btn.active {
    background: var(--amber);
    border-color: var(--amber);
    color: #000;
    font-weight: 600;
}

.toggle-btn:hover:not(.active) {
    border-color: var(--amber);
}

/* Checkboxes */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

/* Results Panel */
.results-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem;
    text-align: center;
}

.result-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--amber);
}

.result-unit {
    font-size: 1rem;
    color: var(--muted);
    margin-left: 0.25rem;
}

.result-sub {
    font-size: 0.7rem;
    color: var(--muted);
    margin-top: 0.25rem;
}

.result-status {
    font-size: 0.85rem;
    margin-top: 0.5rem;
    padding: 0.25rem;
    border-radius: 20px;
    background: rgba(74, 222, 128, 0.1);
    color: var(--green);
}

.result-status.fail {
    background: rgba(255, 77, 77, 0.1);
    color: var(--red);
}

/* Influence Bars */
.influence-card, .explanation-card, .tradeoff-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem;
}

.influence-bars {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.influence-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
}

.influence-item span:first-child {
    width: 70px;
}

.bar-container {
    flex: 1;
    background: var(--dim);
    border-radius: 4px;
    height: 8px;
    overflow: hidden;
}

.bar {
    height: 100%;
    background: var(--amber);
    border-radius: 4px;
    transition: width 0.2s ease;
}

.influence-item span:last-child {
    width: 35px;
    text-align: right;
    font-family: var(--font-mono);
    color: var(--amber);
}

/* Explanation */
.explanation-card ul {
    list-style: none;
    margin-top: 0.5rem;
}

.explanation-card li {
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
    color: var(--text);
    line-height: 1.4;
}

/* Trade-offs */
.tradeoff-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
}

.tradeoff-item span:first-child {
    width: 70px;
}

.durability-bar {
    background: var(--green);
}

.handfeel-bar {
    background: var(--cyan);
}

/* Reset Button */
.reset-btn {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 40px;
    padding: 0.6rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 0.5rem;
}

.reset-btn:hover {
    border-color: var(--amber);
    color: var(--amber);
}

/* Footer */
.footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--muted);
    flex-wrap: wrap;
    gap: 1rem;
}

.footer a {
    color: var(--amber);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 900px) {
    body {
        padding: 1rem;
    }
    .two-column {
        grid-template-columns: 1fr;
    }
    .footer {
        flex-direction: column;
        text-align: center;
    }
    .phase-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .result-value {
        font-size: 2.5rem;
    }
}