:root {
    --bg: #fafafa;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-canvas: #f7f7f7;
    --border: #e8e8e8;
    --border-hover: #d0d0d0;
    --text-primary: #1a1a1a;
    --text-secondary: #3d3d3d;
    --text-muted: #6b6b6b;
    --accent: #2d8a4e;
    --accent-hover: #236b3d;
    --accent-light: rgba(45, 138, 78, 0.1);
    --green: #2d8a4e;
    --blue: #2563eb;
    --cyan: #0891b2;
    --red: #c41e3a;
    --violet: #6b5b95;
    --yellow: #b8860b;
    --orange: #2d8a4e;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-weight: 800;
    font-size: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo svg {
    color: var(--accent);
}

.logo-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.nav-section {
    padding: 0 0.75rem;
    margin-bottom: 1.5rem;
}

.nav-section-title {
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: 0 0.75rem;
    margin-bottom: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    cursor: pointer;
}

.nav-item:hover {
    background: var(--bg);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-light);
    color: var(--accent);
}

.nav-item svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-item.active svg {
    opacity: 1;
}

.inline-select {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    padding-right: 1rem;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0 center;
}

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

.inline-select:focus {
    outline: none;
    color: var(--text-primary);
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}

.version {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.nav-note {
    padding: 0 0.75rem;
    margin-bottom: 1.5rem;
    margin-top: 0;
}

.nav-note-title {
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0 0.75rem;
    margin-bottom: 0.5rem;
}

.nav-note-list {
    display: flex;
    flex-direction: column;
}

.nav-note-item {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    display: flex;
    gap: 0.625rem;
    align-items: center;
    padding: 0.5rem 0.75rem;
}

.nav-note-icon {
    color: var(--text-secondary);
    opacity: 0.7;
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.main-content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
    background: var(--bg-canvas);
}

.content-header {
    margin-bottom: 2rem;
}

.content-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
    letter-spacing: -0.02em;
}

.content-header p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    font-weight: 400;
}

.form-canvas {
    max-width: 100%;
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-card {
    flex: 1;
    background: var(--bg-card);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.form-card.compact {
    flex: 0 1 auto;
    min-width: 280px;
}

.form-card h2 {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.input-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.input-row:last-child {
    margin-bottom: 0;
}

.form-group {
    flex: 1;
    min-width: 0;
}

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
}

.input-with-prefix {
    display: flex;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-input);
    transition: all 0.15s;
    overflow: hidden;
}

.input-with-prefix:hover {
    border-color: var(--border-hover);
}

.input-with-prefix:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.input-with-prefix .prefix {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 100%;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    user-select: none;
    background: transparent;
    border-right: 1px solid var(--border);
    opacity: 0.85;
}

.input-with-prefix input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    min-width: 0;
    font-variant-numeric: tabular-nums;
}

.input-with-prefix input:focus {
    outline: none;
}

.form-group input:not([type="checkbox"]),
.form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: inherit;
    transition: all 0.15s;
}

.form-group input:hover,
.form-group select:hover {
    border-color: var(--border-hover);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.form-group select {
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

.checkbox-row label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.hint {
    display: block;
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.calculate-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #ffffff;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
    margin-top: 0.5rem;
    letter-spacing: 0;
}

.calculate-btn:hover {
    background: var(--accent-hover);
    transform: none;
}

.calculate-btn:active {
    transform: scale(0.98);
}

#results {
    margin-top: 2rem;
}

.results-header {
    margin-bottom: 1.5rem;
}

.results-header h2 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.metrics-bar {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.metrics-bar .metric {
    flex: 1;
    text-align: center;
}

.metric-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

.metric-label {
    display: block;
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.metric-value {
    display: block;
    font-size: 1.375rem;
    font-weight: 800;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.metric-value.green { color: var(--green); }
.metric-value.red { color: var(--red); }
.metric-value.violet { color: var(--violet); }

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.result-card {
    background: var(--bg-card);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.result-card h3 {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-card h3::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 2px;
}

.result-card.income h3 { color: var(--green); }
.result-card.income h3::before { background: var(--green); }

.result-card.deduction h3 { color: var(--blue); }
.result-card.deduction h3::before { background: var(--blue); }

.result-card.pretax h3 { color: var(--cyan); }
.result-card.pretax h3::before { background: var(--cyan); }

.result-card.taxes h3 { color: var(--red); }
.result-card.taxes h3::before { background: var(--red); }

.result-card.retirement h3 { color: var(--violet); }
.result-card.retirement h3::before { background: var(--violet); }

.result-card.cashflow h3 { color: var(--yellow); }
.result-card.cashflow h3::before { background: var(--yellow); }

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.25rem 0;
    font-size: 0.8125rem;
}

.result-row.total {
    font-weight: 600;
    border-top: 1px solid var(--border);
    margin-top: 0.375rem;
    padding-top: 0.5rem;
}

.result-card.deduction .result-row.total {
    border-top: none;
    margin-top: 0;
    padding-top: 0;
}

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

.result-row .value {
    color: var(--text-primary);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.result-row .value.green { color: var(--green); }
.result-row .value.red { color: var(--red); }
.result-row .value.cyan { color: var(--cyan); }
.result-row .value.magenta, .result-row .value.violet { color: var(--violet); }
.result-row .value.yellow { color: var(--yellow); }

.assumptions {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-align: center;
    padding: 0.75rem;
    line-height: 1.5;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

@media (max-width: 1024px) {
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.mobile-header {
    display: none;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1rem;
    margin: -1.5rem -1.5rem 1.5rem -1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.mobile-logo {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.mobile-settings {
    display: flex;
    gap: 0.5rem;
}

.mobile-select {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.8125rem;
    font-family: inherit;
}

.mobile-privacy {
    margin-top: 0.5rem;
    font-size: 0.6875rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .mobile-header {
        display: block;
    }

    .content-header {
        display: none;
    }

    .sidebar {
        display: none;
    }
    
    .main-content {
        padding: 1.5rem;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .input-row {
        flex-direction: column;
    }
    
    .metrics-bar {
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .metric-divider {
        display: none;
    }
    
    .metrics-bar .metric {
        flex: 0 0 calc(33.333% - 0.67rem);
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
}