/**
 * Micras Demographics Tool - Main Styles
 * 
 * Base styles, CSS variables, and core layout.
 */

/* ===== CSS Variables ===== */
:root {
    /* Primary colors */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-light: #DBEAFE;
    --color-primary-dark: #1E40AF;
    
    /* Status colors */
    --color-success: #059669;
    --color-success-light: #D1FAE5;
    --color-warning: #D97706;
    --color-warning-light: #FEF3C7;
    --color-error: #DC2626;
    --color-error-dark: #B91C1C;
    --color-error-light: #FEE2E2;
    
    /* Neutral colors */
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F9FAFB;
    --color-bg-tertiary: #F3F4F6;
    --color-border: #E5E7EB;
    --color-border-dark: #D1D5DB;
    --color-text: #111827;
    --color-text-secondary: #6B7280;
    --color-text-muted: #9CA3AF;
    
    /* Chart colors */
    --color-male: #3B82F6;
    --color-female: #EC4899;
    --color-chart-1: #2563EB;
    --color-chart-2: #7C3AED;
    --color-chart-3: #059669;
    --color-chart-4: #D97706;
    --color-chart-5: #DC2626;
    --color-chart-6: #0891B2;
    --color-chart-7: #4F46E5;
    --color-chart-8: #DB2777;
    
    /* Spacing (8px grid) */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.25rem;  /* 20px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-10: 2.5rem;  /* 40px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, Consolas, 'Liberation Mono', monospace;
    
    --text-xs: 0.75rem;    /* 12px */
    --text-sm: 0.875rem;   /* 14px */
    --text-base: 1rem;     /* 16px */
    --text-lg: 1.125rem;   /* 18px */
    --text-xl: 1.25rem;    /* 20px */
    --text-2xl: 1.5rem;    /* 24px */
    --text-3xl: 1.875rem;  /* 30px */
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    
    /* Borders */
    --radius-sm: 0.25rem;  /* 4px */
    --radius-md: 0.375rem; /* 6px */
    --radius-lg: 0.5rem;   /* 8px */
    --radius-xl: 0.75rem;  /* 12px */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Z-index layers */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-notification: 400;
    
    /* Layout */
    --max-width: 1200px;
    --sidebar-width: 280px;
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
    /* Primary colors - slightly brighter for dark mode */
    --color-primary: #3B82F6;
    --color-primary-hover: #60A5FA;
    --color-primary-light: #1E3A5F;
    --color-primary-dark: #93C5FD;

    /* Status colors - adjusted for dark backgrounds */
    --color-success: #10B981;
    --color-success-light: #064E3B;
    --color-warning: #F59E0B;
    --color-warning-light: #78350F;
    --color-error: #EF4444;
    --color-error-dark: #DC2626;
    --color-error-light: #7F1D1D;

    /* Neutral colors - inverted */
    --color-bg: #111827;
    --color-bg-secondary: #1F2937;
    --color-bg-tertiary: #374151;
    --color-border: #374151;
    --color-border-dark: #4B5563;
    --color-text: #F9FAFB;
    --color-text-secondary: #9CA3AF;
    --color-text-muted: #6B7280;

    /* Chart colors - same but may need slight adjustments */
    --color-male: #60A5FA;
    --color-female: #F472B6;

    /* Shadows - darker for dark mode */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

/* ===== Reset ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
    min-height: 100vh;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
}

/* ===== Typography ===== */
h1 {
    font-size: var(--text-3xl);
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h2 {
    font-size: var(--text-2xl);
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

p {
    margin-bottom: var(--space-4);
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ===== Site Top Navigation ===== */
.micras-tool-nav {
    background: #293241;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    height: 40px;
    font-size: 0.85rem;
    gap: 0.5rem;
    position: relative;
    z-index: 9999;
}
.micras-tool-nav a {
    color: #ffffff;
    text-decoration: none;
    transition: color 0.2s;
}
.micras-tool-nav a:hover {
    text-decoration: underline;
}
.micras-tool-nav .micras-tool-nav-sep {
    color: rgba(255, 255, 255, 0.6);
    margin: 0 0.25rem;
}

/* ===== Layout ===== */
.app-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-4);
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-6);
    margin-bottom: var(--space-6);
}

.app-header h1 {
    font-size: var(--text-xl);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.app-header .subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: normal;
}

.header-actions {
    display: flex;
    gap: var(--space-2);
}

.app-main {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

/* ===== Utility Classes ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

.text-right {
    text-align: right;
}

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

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

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

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

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* ===== Notifications ===== */
.notification {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    max-width: 400px;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    z-index: var(--z-notification);
    animation: slideIn var(--transition-normal);
}

@keyframes slideIn {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.notification-success {
    background: var(--color-success-light);
    border: 1px solid var(--color-success);
    color: var(--color-success);
}

.notification-error {
    background: var(--color-error-light);
    border: 1px solid var(--color-error);
    color: var(--color-error);
}

.notification-warning {
    background: var(--color-warning-light);
    border: 1px solid var(--color-warning);
    color: var(--color-warning);
}

.notification-info {
    background: var(--color-primary-light);
    border: 1px solid var(--color-primary);
    color: var(--color-primary-dark);
}

.notification-message {
    flex: 1;
    white-space: pre-line;
}

.notification-close {
    background: none;
    border: none;
    font-size: var(--text-xl);
    cursor: pointer;
    opacity: 0.7;
    padding: 0;
    line-height: 1;
}

.notification-close:hover {
    opacity: 1;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-dark);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    fill: var(--color-text-secondary);
    transition: fill var(--transition-fast);
}

.theme-toggle:hover svg {
    fill: var(--color-text);
}

/* Sun icon shown in dark mode, moon in light mode */
.theme-toggle .icon-sun {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: block;
}

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

/* ===== Navigation Links Dropdown ===== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.nav-dropdown-toggle:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-dark);
    color: var(--color-text);
}

.nav-dropdown-toggle svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
    transition: transform var(--transition-fast);
}

.nav-dropdown.open .nav-dropdown-toggle svg {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    padding: var(--space-2);
    z-index: var(--z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-menu a {
    display: block;
    padding: var(--space-2) var(--space-3);
    color: var(--color-text);
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.nav-dropdown-menu a:hover {
    background: var(--color-bg-secondary);
    text-decoration: none;
}

.nav-dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-2) 0;
}

.nav-dropdown-label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-2) var(--space-3) var(--space-1);
}

/* ===== Changelog Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay.open .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    margin: 0;
    font-size: var(--text-lg);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0;
    line-height: 1;
}

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

.modal-body {
    padding: var(--space-6);
    overflow-y: auto;
}

.changelog-version {
    margin-bottom: var(--space-6);
}

.changelog-version:last-child {
    margin-bottom: 0;
}

.changelog-version h3 {
    font-size: var(--text-base);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.changelog-version .version-tag {
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

[data-theme="dark"] .changelog-version .version-tag {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.changelog-version .version-date {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.changelog-version ul {
    margin: 0;
    padding-left: var(--space-5);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.changelog-version li {
    margin-bottom: var(--space-1);
}

/* ===== Intro Box ===== */
.intro-box {
    max-width: 800px;
    margin: 0 auto var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.intro-box p {
    margin: 0;
}

.intro-methodology-link {
    color: var(--color-primary);
    text-decoration: none;
}

.intro-methodology-link:hover {
    text-decoration: underline;
}

/* ===== Methodology Section ===== */
.methodology-section {
    max-width: 800px;
    margin: var(--space-6) auto;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.methodology-section summary {
    padding: var(--space-3) var(--space-4);
    font-weight: 600;
    font-size: var(--text-base);
    color: var(--color-text);
    cursor: pointer;
    user-select: none;
}

.methodology-section summary:hover {
    color: var(--color-primary);
}

.methodology-section[open] summary {
    border-bottom: 1px solid var(--color-border);
}

.methodology-content {
    padding: var(--space-4);
}

.methodology-content h3 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    margin: var(--space-4) 0 var(--space-2);
}

.methodology-content h3:first-child {
    margin-top: 0;
}

.methodology-content ul {
    margin: 0 0 var(--space-2);
    padding-left: var(--space-5);
}

.methodology-content li {
    margin-bottom: var(--space-1);
}

.methodology-content code {
    background: var(--color-bg-secondary);
    padding: 1px 4px;
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
}

/* ===== Focus States ===== */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    :root {
        --text-3xl: 1.5rem;
        --text-2xl: 1.25rem;
        --text-xl: 1.125rem;
    }
    
    .app-container {
        padding: var(--space-2);
    }
    
    .notification {
        left: var(--space-4);
        right: var(--space-4);
        bottom: var(--space-4);
        max-width: none;
    }
}