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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

/* --- Layout --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Typography Utilities --- */
.text-center {
    text-align: center;
}

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

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

.text-lg {
    font-size: 1.125rem;
}

.text-xl {
    font-size: 1.25rem;
}

.text-2xl {
    font-size: 1.5rem;
}

/* --- Components: Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    font-family: 'Inter', sans-serif;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-light);
    box-shadow: 0 4px 6px -1px rgba(var(--primary-h), var(--primary-s), 50%, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(var(--primary-h), var(--primary-s), 50%, 0.4);
}

/* --- Components: Cards (Glassmorphism) --- */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* --- Components: Forms --- */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--slate-700);
}

.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-surface);
    color: var(--text-main);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.2);
}

/* Range Sliders */
.range-wrapper {
    margin-top: 0.5rem;
}

input[type=range] {
    width: 100%;
    height: 6px;
    background: var(--slate-200);
    border-radius: var(--radius-Full);
    outline: none;
    -webkit-appearance: none;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 0 2px var(--bg-surface);
    transition: transform 0.1s;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}


/* --- Navigation (From previous requirement) --- */
.tabs-container {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.5rem 1.5rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-Full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    white-space: nowrap;
}

.tab-btn:hover {
    background: var(--slate-100);
    color: var(--text-main);
}

.tab-btn.active {
    background: var(--primary);
    color: var(--text-light);
}

/* --- Layouts for Tools --- */
.calculator-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .calculator-layout {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
}

.result-box {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--slate-50) 0%, #ffffff 100%);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.big-value {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
    margin-top: 0.5rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px dashed var(--border);
}

.breakdown-item:last-child {
    border-bottom: none;
}

.chart-container {
    width: 100%;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}