:root {
    /* Color Palette - Matching Text Cleaner */
    --color-text: #343a40;
    --color-background: #f8f9fa;
    --color-surface: #ffffff;
    --color-primary: #337ab7;
    --color-primary-hover: #286090;
    --color-success: #5cb85c;
    --color-success-hover: #4cae4c;
    --color-warning: #f0ad4e;
    --color-warning-hover: #ec971f;
    --color-secondary: #6c757d;
    --color-secondary-hover: #5a6268;
    --color-border: #dee2e6;
    --color-muted: #6c757d;
    --color-header-bg: #212529;
    --color-header-text: #ffffff;
    --color-code-bg: #e9ecef;
    --color-highlight: #28a745;

    /* Typography */
    --font-family-sans-serif: 'Inter', sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-sm: 0.875rem;
    --font-size-h1: 2rem;
    --font-size-h2: 1.5rem;
    --font-weight-normal: 400;
    --font-weight-bold: 700;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 1rem;
    --spacing-4: 1.5rem;
    --spacing-5: 2rem;

    /* Borders */
    --border-width: 1px;
    --border-radius: 0.375rem;
    --border-radius-sm: 0.25rem;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-sans-serif);
    line-height: var(--line-height-base);
    margin: 0;
    padding: 0;
    background-color: var(--color-background);
    color: var(--color-text);
}

/* --- Header --- */
header {
    background: var(--color-warning);
    padding: var(--spacing-3) var(--spacing-5);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4);
}

#header-logo {
    max-height: 60px;
    width: auto;
}

.header-logo-link {
    text-decoration: none;
    border: none;
    outline: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.header-logo-link:hover {
    transform: scale(1.05);
    opacity: 0.8;
}

.header-logo-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.header-text {
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: var(--font-size-h1);
    color: #1a1a1a;
}

header p {
    font-size: var(--font-size-sm);
    color: #333333;
    margin: var(--spacing-1) 0 0 0;
}

.theme-toggle-btn {
    background: transparent;
    border: 2px solid #1a1a1a;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
}

.theme-icon-dark {
    display: none;
}

body.dark-mode .theme-icon-light {
    display: none;
}

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

body.dark-mode .theme-toggle-btn {
    border-color: var(--color-text);
}

/* --- Main Layout --- */
main {
    padding: var(--spacing-3);
}

.container {
    max-width: 1000px;
    margin: auto;
    padding: 0 var(--spacing-5);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-5);
}

#calculator-section, #results-section {
    background: var(--color-surface);
    padding: var(--spacing-4);
    border-radius: var(--border-radius);
    box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

h2 {
    color: var(--color-text);
    margin-top: 0;
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-4);
}

/* --- Meeting Type Options --- */
.meeting-type-options {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    padding: var(--spacing-4);
    margin: var(--spacing-3) 0;
}

.meeting-type-options h3 {
    margin: 0 0 var(--spacing-3) 0;
    color: var(--color-primary);
    font-size: 1.1em;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-2);
}

.meeting-type-options h4 {
    margin: var(--spacing-3) 0 var(--spacing-2) 0;
    color: var(--color-text);
    font-size: 1em;
    font-weight: var(--font-weight-bold);
}

body.dark-mode .meeting-type-options {
    background: var(--color-code-bg);
    border-color: var(--color-border);
}

body.dark-mode .meeting-type-options h3 {
    color: var(--color-primary);
}

body.dark-mode .meeting-type-options h4 {
    color: var(--color-text);
}

/* --- Form Elements --- */
.form-group {
    margin-bottom: var(--spacing-3);
}

.form-group label {
    display: block;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-1);
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: var(--font-family-sans-serif);
    background-color: var(--color-surface);
    color: var(--color-text);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(51, 122, 183, 0.15);
}

.form-group .hint {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin-top: var(--spacing-1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3);
}

/* --- Buttons --- */
.button {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius);
    margin-right: var(--spacing-2);
    margin-top: var(--spacing-2);
    text-align: center;
    transition: background-color 0.15s ease-in-out;
}

.button-primary {
    background-color: var(--color-primary);
    color: var(--color-header-text);
}
.button-primary:hover {
    background-color: var(--color-primary-hover);
}

.button-success {
    background-color: var(--color-success);
    color: var(--color-header-text);
}
.button-success:hover {
    background-color: var(--color-success-hover);
}

.button-secondary {
    background-color: var(--color-secondary);
    color: var(--color-header-text);
}
.button-secondary:hover {
    background-color: var(--color-secondary-hover);
}

/* --- Cost Breakdown --- */
.cost-breakdown {
    background: var(--color-code-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    margin: var(--spacing-2) 0;
}

.cost-breakdown h3 {
    margin: 0 0 var(--spacing-3) 0;
    color: var(--color-text);
    font-size: 1em;
    font-weight: var(--font-weight-bold);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-1) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.breakdown-label {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
}

.breakdown-value {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

/* --- Meeting Type Details --- */
.meeting-type-details {
    background: #e8f4fd;
    border: 1px solid #bee5eb;
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    margin: var(--spacing-2) 0;
}

.meeting-type-details h4 {
    margin: 0 0 var(--spacing-2) 0;
    color: var(--color-primary);
    font-size: 0.9em;
    font-weight: var(--font-weight-bold);
}

.meeting-type-details p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-muted);
}

body.dark-mode .cost-breakdown {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
}

body.dark-mode .cost-breakdown h3 {
    color: var(--color-text);
}

body.dark-mode .breakdown-label {
    color: var(--color-muted);
}

body.dark-mode .breakdown-value {
    color: var(--color-text);
}

body.dark-mode .meeting-type-details {
    background: var(--color-surface);
    border-color: var(--color-primary);
}

body.dark-mode .meeting-type-details h4 {
    color: var(--color-primary);
}

body.dark-mode .meeting-type-details p {
    color: var(--color-muted);
}

/* --- Results Section --- */
.results-placeholder {
    text-align: center;
    padding: var(--spacing-5);
    color: var(--color-muted);
    background: var(--color-code-bg);
    border-radius: var(--border-radius);
}

.results-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.result-card {
    background: var(--color-code-bg);
    padding: var(--spacing-3);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.result-card.result-primary .result-value {
    font-size: 1.75rem;
}

.result-card.result-secondary {
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border);
}

.result-card.result-highlight {
    background: linear-gradient(135deg, var(--color-success) 0%, #3d9140 100%);
    color: white;
}

.result-card.result-highlight .result-value {
    font-size: 1.5rem;
}

.result-label {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
}

.result-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3);
}

.insight-box {
    background: #fff3cd;
    border: var(--border-width) solid #ffc107;
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    margin-top: var(--spacing-2);
}

.insight-box h3 {
    margin: 0 0 var(--spacing-2) 0;
    font-size: var(--font-size-base);
    color: #856404;
}

.insight-box p {
    margin: 0;
    color: #856404;
    font-size: var(--font-size-sm);
}

/* --- Help Section --- */
#help-section {
    max-width: 1000px;
    margin: var(--spacing-5) auto;
    padding: 0 var(--spacing-5);
}

#help-section h2 {
    color: var(--color-primary);
    text-align: center;
    margin-bottom: var(--spacing-4);
    font-size: 2em;
}

.help-article {
    background-color: var(--color-surface);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 6px rgba(0,0,0,0.07);
}

.help-article:last-child {
    margin-bottom: 0;
}

.help-article h3 {
    color: var(--color-primary-hover);
    margin-top: 0;
    margin-bottom: var(--spacing-3);
    font-size: 1.25em;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-2);
}

.help-article p,
.help-article ul,
.help-article ol {
    line-height: 1.75;
    color: var(--color-muted);
    margin-bottom: var(--spacing-3);
}

.help-article ul,
.help-article ol {
    padding-left: 30px;
}

.help-article li {
    margin-bottom: var(--spacing-2);
}

.help-article strong {
    color: var(--color-text);
}

/* --- Contact Section --- */
#contact-section {
    max-width: 600px;
    margin: var(--spacing-5) auto;
    padding: var(--spacing-4);
    background: var(--color-surface);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 6px rgba(0,0,0,0.07);
    text-align: center;
}

#contact-section h2 {
    color: var(--color-primary);
}

#contact-section > p {
    color: var(--color-muted);
    margin-bottom: var(--spacing-4);
}

.contact-form {
    text-align: left;
}

.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}

.form-status {
    text-align: center;
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.form-status.success {
    color: var(--color-success);
}

.form-status.error {
    color: #dc3545;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: var(--spacing-4) 0;
    margin-top: var(--spacing-4);
    border-top: var(--border-width) solid var(--color-border);
}

.privacy-statement {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin: var(--spacing-1) 0;
}

.privacy-statement a {
    color: var(--color-primary);
}

.footer-stats {
    font-size: 0.75rem;
    color: var(--color-muted);
    margin-top: var(--spacing-2);
    opacity: 0.7;
}

/* --- Media Queries --- */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .result-row {
        grid-template-columns: 1fr;
    }
    
    header {
        flex-direction: column;
        text-align: center;
    }
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
    body:not(.light-mode) {
        --color-text: #e9ecef;
        --color-background: #1a1a2e;
        --color-surface: #16213e;
        --color-primary: #4dabf7;
        --color-primary-hover: #74c0fc;
        --color-success: #69db7c;
        --color-success-hover: #8ce99a;
        --color-warning: #ffd43b;
        --color-warning-hover: #ffe066;
        --color-secondary: #868e96;
        --color-secondary-hover: #adb5bd;
        --color-border: #495057;
        --color-muted: #adb5bd;
        --color-header-bg: #0f0f23;
        --color-header-text: #e9ecef;
        --color-code-bg: #2d3748;
    }

    body:not(.light-mode) header h1,
    body:not(.light-mode) header p {
        color: #1a1a1a;
    }

    body:not(.light-mode) .insight-box {
        background: #3d3d00;
        border-color: #666600;
    }

    body:not(.light-mode) .insight-box h3,
    body:not(.light-mode) .insight-box p {
        color: #ffd43b;
    }
}

body.dark-mode {
    --color-text: #e9ecef;
    --color-background: #1a1a2e;
    --color-surface: #16213e;
    --color-primary: #4dabf7;
    --color-primary-hover: #74c0fc;
    --color-success: #69db7c;
    --color-success-hover: #8ce99a;
    --color-warning: #ffd43b;
    --color-warning-hover: #ffe066;
    --color-secondary: #868e96;
    --color-secondary-hover: #adb5bd;
    --color-border: #495057;
    --color-muted: #adb5bd;
    --color-header-bg: #0f0f23;
    --color-header-text: #e9ecef;
    --color-code-bg: #2d3748;
}

body.dark-mode header h1,
body.dark-mode header p {
    color: #1a1a1a;
}

body.dark-mode .insight-box {
    background: #3d3d00;
    border-color: #666600;
}

body.dark-mode .insight-box h3,
body.dark-mode .insight-box p {
    color: #ffd43b;
}