/* ============================================
   Provider Coverage Calculator - Design System
   Modern, Premium UI with Dark Mode
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Color Palette - Dark Mode */
    --bg-primary: hsl(220, 25%, 10%);
    --bg-secondary: hsl(220, 25%, 14%);
    --bg-card: hsl(220, 25%, 16%);
    --bg-elevated: hsl(220, 25%, 20%);

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Accent Colors */
    --accent-primary: hsl(210, 100%, 60%);
    --accent-secondary: hsl(280, 80%, 60%);
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    --accent-glow: 0 0 20px hsla(210, 100%, 60%, 0.3);

    /* Text Colors */
    --text-primary: hsl(0, 0%, 95%);
    --text-secondary: hsl(220, 15%, 65%);
    --text-muted: hsl(220, 15%, 45%);

    /* Status Colors */
    --success: hsl(145, 70%, 50%);
    --warning: hsl(45, 100%, 55%);
    --error: hsl(0, 75%, 55%);

    /* Semantic Colors */
    --our-view: hsl(210, 100%, 60%);
    --their-view: hsl(145, 70%, 50%);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
}

/* Light Mode Theme */
[data-theme="light"] {
    --bg-primary: hsl(220, 20%, 97%);
    --bg-secondary: hsl(220, 20%, 94%);
    --bg-card: hsl(0, 0%, 100%);
    --bg-elevated: hsl(220, 20%, 98%);

    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

    --accent-primary: hsl(210, 100%, 50%);
    --accent-secondary: hsl(280, 80%, 50%);
    --accent-glow: 0 0 20px hsla(210, 100%, 50%, 0.2);

    --text-primary: hsl(220, 25%, 15%);
    --text-secondary: hsl(220, 15%, 40%);
    --text-muted: hsl(220, 15%, 60%);

    --success: hsl(145, 70%, 40%);
    --warning: hsl(45, 100%, 45%);
    --error: hsl(0, 75%, 50%);

    --our-view: hsl(210, 100%, 50%);
    --their-view: hsl(145, 70%, 40%);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at 20% 0%, hsla(210, 100%, 60%, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, hsla(280, 80%, 60%, 0.08) 0%, transparent 50%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-icon {
    font-size: 1.5em;
    -webkit-text-fill-color: initial;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* Model Controls */
.model-controls {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.model-select {
    appearance: none;
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-lg) var(--space-sm) var(--space-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    min-width: 180px;
}

.model-select:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--accent-glow);
}

.model-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.model-select optgroup {
    background: var(--bg-card);
    color: var(--text-secondary);
    font-weight: 600;
    padding: var(--space-sm);
}

.model-select option {
    background: var(--bg-elevated);
    color: var(--text-primary);
    padding: var(--space-sm);
}

/* Button Danger */
.btn-danger {
    background: transparent;
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    color: var(--error);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-danger:hover:not(:disabled) {
    background: var(--error);
    color: white;
}

.btn-danger:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary.btn-small {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    width: 44px;
    height: 44px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all var(--transition-fast);
    margin-left: var(--space-md);
}

.theme-toggle:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--accent-glow);
    transform: scale(1.05);
}

/* Dark mode: show moon, hide sun */
.theme-icon-light {
    display: none;
}

.theme-icon-dark {
    display: inline;
}

/* Light mode: show sun, hide moon */
[data-theme="light"] .theme-icon-light {
    display: inline;
}

[data-theme="light"] .theme-icon-dark {
    display: none;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 580px 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    max-width: 2000px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

/* Inputs Panel */
.inputs-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-xl);
    height: fit-content;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    overflow-x: hidden;
    min-width: 480px;
}

.inputs-panel::-webkit-scrollbar {
    width: 8px;
}

.inputs-panel::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.inputs-panel::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

.inputs-panel::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--glass-border);
}

.panel-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* Input Sections */
.input-section {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--glass-border);
}

.input-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-icon {
    font-size: 1.1em;
}

/* Input Grid */
.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md) var(--space-lg);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.input-group label {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--text-secondary);
    white-space: normal;
    word-wrap: break-word;
    line-height: 1.3;
}

.input-group input,
.input-group select {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

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

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px hsla(210, 100%, 60%, 0.15);
}

.input-group input[readonly] {
    background: var(--bg-primary);
    color: var(--text-muted);
    cursor: not-allowed;
}

/* Input with prefix/suffix */
.input-with-prefix,
.input-with-suffix {
    display: flex;
    align-items: stretch;
}

.input-with-prefix input,
.input-with-suffix input {
    flex: 1;
    min-width: 0;
}

.input-with-prefix .prefix,
.input-with-suffix .suffix {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    padding: 0 var(--space-sm);
    min-width: 28px;
}

.input-with-prefix .prefix {
    border-right: none;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.input-with-prefix input {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.input-with-suffix .suffix {
    border-left: none;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.input-with-suffix input {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

/* Margin Levels */
.margin-levels {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.margin-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.margin-item .input-with-suffix {
    flex: 1;
}

.margin-item .margin-input {
    width: 100%;
}

.btn-remove-margin {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    line-height: 1;
}

.btn-remove-margin:hover {
    color: var(--error);
    background: hsla(0, 75%, 55%, 0.1);
}

.btn-add-margin {
    background: transparent;
    border: 1px dashed var(--glass-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
}

.btn-add-margin:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: hsla(210, 100%, 60%, 0.05);
}

/* Toggle */
.toggle-group {
    margin-bottom: var(--space-md);
}

.toggle {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.toggle input {
    display: none;
}

.toggle-slider {
    width: 44px;
    height: 24px;
    background: var(--bg-secondary);
    border-radius: 12px;
    position: relative;
    transition: all var(--transition-fast);
    border: 1px solid var(--glass-border);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: var(--text-muted);
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: all var(--transition-fast);
}

.toggle input:checked+.toggle-slider {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle input:checked+.toggle-slider::before {
    background: white;
    transform: translateX(20px);
}

.toggle-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.scenario-inputs {
    margin-top: var(--space-md);
}

.scenario-inputs.hidden {
    display: none;
}

/* Results Panel */
.results-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* Tabs */
.tabs-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
}

.tabs {
    display: flex;
    gap: var(--space-sm);
}

.tab {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: transparent;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
}

.tab.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--accent-glow);
}

.tab-icon {
    font-size: 1.1em;
}

/* Export Buttons */
.export-buttons {
    display: flex;
    gap: var(--space-sm);
}

.btn-export {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-export:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
    box-shadow: var(--accent-glow);
}

.btn-icon {
    font-size: 1em;
}

/* Tab Content */
.tab-content {
    padding: var(--space-lg);
}

.tab-pane {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Results Cards */
.results-grid {
    display: grid;
    gap: var(--space-lg);
}

.result-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
}

.card-icon {
    font-size: 1.25em;
}

.card-title {
    font-size: var(--font-size-md);
    font-weight: 600;
}

.card-body {
    padding: var(--space-lg);
}

/* Data Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.data-table th {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    font-size: var(--font-size-sm);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table .label {
    color: var(--text-secondary);
}

.data-table .value {
    font-weight: 600;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

.data-table .value.positive {
    color: var(--success);
}

.data-table .value.negative {
    color: var(--error);
}

.data-table .highlight {
    background: hsla(210, 100%, 60%, 0.05);
}

.data-table .highlight .value {
    color: var(--accent-primary);
}

/* Margin Results Table */
.margin-table {
    width: 100%;
    border-collapse: collapse;
}

.margin-table th,
.margin-table td {
    padding: var(--space-md);
    text-align: center;
    border: 1px solid var(--glass-border);
}

.margin-table th {
    background: var(--bg-secondary);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.margin-table th:first-child,
.margin-table td:first-child {
    text-align: left;
}

.margin-table td {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.margin-table .row-label {
    color: var(--text-secondary);
    font-weight: 400;
}

.margin-table .currency {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    color: var(--text-primary);
}

/* Scenario Columns */
.scenario-table th.scenario-low,
.scenario-table td.scenario-low {
    background: hsla(45, 100%, 55%, 0.05);
}

.scenario-table th.scenario-base,
.scenario-table td.scenario-base {
    background: hsla(210, 100%, 60%, 0.05);
}

.scenario-table th.scenario-high,
.scenario-table td.scenario-high {
    background: hsla(145, 70%, 50%, 0.05);
}

/* Summary Bar */
.summary-bar {
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
    padding: var(--space-md) var(--space-xl);
    position: sticky;
    bottom: 0;
}

.summary-content {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
}

.summary-item {
    text-align: center;
}

.summary-label {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.summary-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

.summary-item.highlight .summary-value,
.summary-item.highlight .summary-value .interactive-value {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.summary-item.highlight .summary-value .interactive-value {
    border-bottom-color: var(--accent-primary);
}

/* Buttons */
.btn-primary {
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-lg);
    color: white;
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    box-shadow: var(--accent-glow);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-lg);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.btn-small {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-xs);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 400px;
    box-shadow: var(--glass-shadow);
    animation: modalIn var(--transition-normal);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color var(--transition-fast);
}

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

.modal-body {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.option-group label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.option-group select {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    padding: var(--space-lg);
    border-top: 1px solid var(--glass-border);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--warning);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: var(--glass-shadow);
    z-index: 1001;
    animation: toastIn var(--transition-normal);
}

.toast.hidden {
    display: none;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.toast-icon {
    font-size: 1.25em;
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--warning);
}

/* Success Toast */
.toast.success {
    border-color: var(--success);
}

.toast.success .toast-message {
    color: var(--success);
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .inputs-panel {
        position: static;
        max-height: none;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--space-md);
    }

    .logo {
        font-size: var(--font-size-md);
    }

    .main-content {
        padding: var(--space-md);
    }

    .input-grid {
        grid-template-columns: 1fr;
    }

    .tabs-container {
        flex-direction: column;
        gap: var(--space-md);
    }

    .summary-content {
        flex-wrap: wrap;
        gap: var(--space-lg);
    }
}

/* ============================================
   Interactive Tooltips
   ============================================ */

.interactive-value {
    cursor: help;
    border-bottom: 1px dotted var(--text-muted);
    position: relative;
    transition: background-color 0.2s;
}

.interactive-value:hover {
    background-color: rgba(67, 97, 238, 0.1);
}

.calc-tooltip {
    position: fixed;
    background: var(--bg-card);
    /* Use var(--bg-card) for theme support */
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    z-index: 1100;
    /* Higher than toast/modal */
    width: 320px;
    max-width: 90vw;
    font-size: 0.9rem;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.calc-tooltip.visible {
    opacity: 1;
    visibility: visible;
}

.calc-tooltip-header {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-tooltip-formula {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.05);
    /* Light mode bg */
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-size: 0.85rem;
    word-break: break-word;
}

/* Dark mode override via data-theme on html or body usually, checking styles... */
/* Using var(--bg-secondary) or similar might be safer if themes are variable based */
[data-theme="dark"] .calc-tooltip-formula {
    background: rgba(255, 255, 255, 0.1);
}

.calc-tooltip-values {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
}

.calc-tooltip-value-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px dashed var(--glass-border);
}

.calc-tooltip-value-row:last-child {
    border-bottom: none;
    margin-bottom: 0;
}