:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --highlight-color: #eff6ff;
    --accent-color: #10b981;
}

body.dark-mode {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f1f5f9;
    --border-color: #334155;
    --highlight-color: #1e293b;
    --accent-color: #34d399;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    padding: 10px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

h1 {
    font-size: 1.5rem;
}

h2 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    border: 1px solid var(--border-color);
}

.card.highlight {
    background-color: var(--highlight-color);
    border: 1px solid var(--primary-color);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

label {
    font-size: 0.85rem;
    margin-bottom: 5px;
    font-weight: 600;
}

.unit-feedback {
    font-size: 0.75rem;
    color: var(--secondary-color);
    margin-top: 4px;
    min-height: 1.2em;
    opacity: 0.8;
}

input, select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--card-bg);
    color: var(--text-color);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    ring: 2px solid var(--primary-color);
}

input[readonly] {
    background-color: var(--bg-color);
    cursor: not-allowed;
}

.bid-slider-container {
    padding: 10px 0;
}

input[type="range"] {
    width: 100%;
    margin: 15px 0;
}

.bid-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

#bid-percentage {
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--primary-color);
}

.loan-result, .result-text {
    margin-top: 15px;
    padding: 10px;
    background-color: var(--bg-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

.dashboard {
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
    color: white;
}

.dashboard h2 {
    color: white;
    border-color: rgba(255,255,255,0.2);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.result-item {
    display: flex;
    flex-direction: column;
    background: rgba(255,255,255,0.1);
    padding: 15px;
    border-radius: 8px;
}

.result-item .label {
    font-size: 0.8rem;
    opacity: 0.9;
}

.result-item .value {
    font-size: 1.2rem;
    font-weight: bold;
}

.highlight-value .value {
    color: #fbbf24;
}

.chart-container {
    background: white;
    padding: 10px;
    border-radius: 8px;
    height: 250px;
}

.actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    margin-bottom: 50px;
}

button {
    flex: 1;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.2s;
}

button:active {
    opacity: 0.8;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.secondary-btn {
    background-color: var(--secondary-color);
    color: white;
}

#theme-toggle {
    flex: none;
    padding: 8px 15px;
    font-size: 0.8rem;
    background: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

@media (max-width: 480px) {
    .grid {
        grid-template-columns: 1fr;
    }
    .result-grid {
        grid-template-columns: 1fr;
    }
}