/* =============================================================================
   CONLANG STUDIO PRO - CLEAN & ACCESSIBLE DESIGN SYSTEM
   ============================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* =============================================================================
   RESET & BASE STYLES
   ============================================================================= */

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

/* =============================================================================
   CSS CUSTOM PROPERTIES
   ============================================================================= */

:root {
    /* Light Mode Colors */
    --bg-primary: #f1f6fd;
    --bg-secondary: #ffffff;
    --bg-accent: #f1f5f9;
    --bg-hover: #e2e8f0;
    
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-white: #ffffff;
    
    --accent-primary: #3b82f6;
    --accent-primary-hover: #2563eb;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    
    --transition: 0.15s ease-in-out;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-accent: #334155;
    --bg-hover: #475569;
    
    --text-primary: #ffffff;
    --text-secondary: #f1f5f9;
    --text-muted: #e2e8f0;
    --text-white: #ffffff;
    
    --accent-primary: #60a5fa;
    --accent-primary-hover: #3b82f6;
    --accent-success: #34d399;
    --accent-warning: #fbbf24;
    --accent-danger: #f87171;
    
    --border-light: #374151;
    --border-medium: #4b5563;
    --border-dark: #6b7280;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

/* =============================================================================
   BODY & BACKGROUND GRADIENTS
   ============================================================================= */

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(135deg, #e0f2fe 0%, #f3e5f5 25%, #e3f2fd 50%, #f1f8e9 75%, #fff3e0 100%) !important;
    background-attachment: fixed !important;
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--text-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
}

/* Dark Mode Background - Fixed */
html[data-theme="dark"],
html[data-theme="dark"] body,
body[data-theme="dark"],
[data-theme="dark"] body,
[data-theme="dark"] html {
    background: #1a202c !important;
    background-color: #1a202c !important;
    background-image: none !important;
}

/* =============================================================================
   LAYOUT COMPONENTS
   ============================================================================= */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--bg-secondary);
    min-height: 100vh;
    box-shadow: 0 0 50px rgba(59, 130, 246, 0.1);
    overflow-x: hidden;
    position: relative;
    transition: background-color var(--transition), box-shadow var(--transition);
}

[data-theme="dark"] .container {
    box-shadow: 0 0 50px rgba(59, 130, 246, 0.2);
}

/* Header */
.header {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    position: relative;
    transition: background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .header {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6 0%, #8b5cf6 25%, #06b6d4 50%, #10b981 75%, #f59e0b 100%);
}

.header h1 {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="dark"] .header h1 {
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--bg-accent);
    border: 2px solid var(--border-light);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2em;
    transition: all var(--transition);
    color: var(--text-primary);
}

.dark-mode-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

.dark-mode-toggle:active {
    transform: scale(0.95);
}

/* =============================================================================
   FORM ELEMENTS & BUTTONS
   ============================================================================= */

.form-group {
    margin-bottom: var(--spacing-lg);
    display: flex !important;
    flex-direction: column !important;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm) !important;
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--text-sm);
    height: auto !important;
    flex-shrink: 0 !important;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition);
    min-height: 48px !important;
    box-sizing: border-box !important;
    display: flex !important;
    align-items: center !important;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:hover:not(:focus) {
    border-color: var(--border-medium);
}

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

/* Select Styling */
select.form-control {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 12px center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-right: 40px;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    height: 48px !important;
    line-height: 1.5 !important;
    padding: 12px 16px !important;
}

[data-theme="dark"] select.form-control {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23f1f5f9' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
}

/* Button Styling */
.btn {
    min-height: 48px !important;
    box-sizing: border-box !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

/* Custom Button Colors */
button[style*="background: linear-gradient(135deg, #ff9800"] {
    background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%) !important;
    color: white !important;
    border: none !important;
}

button[style*="background: linear-gradient(135deg, #2196F3"] {
    background: #2196F3 !important;
    color: white !important;
    border: none !important;
}

/* Form Grid Layouts */
.form-grid-2,
.form-grid-3,
.form-grid-4,
.form-grid-5 {
    display: grid !important;
    gap: var(--spacing-lg) !important;
    align-items: end !important;
}

.form-grid-2 { grid-template-columns: 1fr 1fr; }
.form-grid-3 { grid-template-columns: 1fr 1fr auto; }
.form-grid-4 { grid-template-columns: 1fr 1fr 1fr auto; }
.form-grid-5 { grid-template-columns: 1fr 1fr 1fr 1fr auto; }

/* Search Filter Bar - Cultural Section Alignment */
.search-filter-bar {
    display: flex !important;
    align-items: end !important;
    gap: var(--spacing-lg) !important;
}

.search-filter-bar > div:first-child {
    flex: 1 !important;
}

.filter-buttons {
    display: flex !important;
    gap: var(--spacing-sm) !important;
    align-items: end !important;
}

/* =============================================================================
   WORD BUILDER SECTIONS - TRANSPARENT STYLING
   ============================================================================= */

/* Base Word Builder */
.word-builder {
    background-color: var(--bg-accent) !important;
    border: 1px solid var(--border-light) !important;
    border-left: 4px solid var(--accent-primary) !important;
}

/* Transparent Backgrounds - Light Mode */
.word-builder[style*="background: linear-gradient(135deg, #fff3e0 0%, #fce4ec 100%)"] {
    background-color: rgba(255, 152, 0, 0.1) !important;
    background-image: none !important;
    border-color: #ff9800 !important;
    border-left-color: #ff9800 !important;
}

.word-builder[style*="background: linear-gradient(135deg, #fce4ec 0%, #f3e5f5 100%)"] {
    background-color: rgba(233, 30, 99, 0.1) !important;
    background-image: none !important;
    border-color: #e91e63 !important;
    border-left-color: #e91e63 !important;
}

.word-builder[style*="background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%)"] {
    background-color: rgba(33, 150, 243, 0.1) !important;
    background-image: none !important;
    border-color: #2196F3 !important;
    border-left-color: #2196F3 !important;
}

.word-builder[style*="background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%)"] {
    background-color: rgba(76, 175, 80, 0.1) !important;
    background-image: none !important;
    border-color: #4CAF50 !important;
    border-left-color: #4CAF50 !important;
}

/* Transparent Backgrounds - Dark Mode */
[data-theme="dark"] .word-builder {
    background-color: var(--bg-accent) !important;
    border-color: var(--border-medium) !important;
}

[data-theme="dark"] .word-builder[style*="background: linear-gradient(135deg, #fff3e0 0%, #fce4ec 100%)"] {
    background-color: rgba(255, 152, 0, 0.15) !important;
    background-image: none !important;
    border-color: #ff9800 !important;
    border-left-color: #ff9800 !important;
}

[data-theme="dark"] .word-builder[style*="background: linear-gradient(135deg, #fce4ec 0%, #f3e5f5 100%)"] {
    background-color: rgba(233, 30, 99, 0.15) !important;
    background-image: none !important;
    border-color: #e91e63 !important;
    border-left-color: #e91e63 !important;
}

[data-theme="dark"] .word-builder[style*="background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%)"] {
    background-color: rgba(33, 150, 243, 0.15) !important;
    background-image: none !important;
    border-color: #2196F3 !important;
    border-left-color: #2196F3 !important;
}

[data-theme="dark"] .word-builder[style*="background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%)"] {
    background-color: rgba(76, 175, 80, 0.15) !important;
    background-image: none !important;
    border-color: #4CAF50 !important;
    border-left-color: #4CAF50 !important;
}

/* =============================================================================
   COMPLETENESS BOXES & STATUS INDICATORS
   ============================================================================= */

/* Green Completed Boxes */
[data-theme="dark"] div[style*="background: #e8f5e8"],
[data-theme="dark"] div[style*="background-color: #e8f5e8"],
[data-theme="dark"] div[style*="#e8f5e8"] {
    background: #064e3b !important;
    background-color: #064e3b !important;
    border: 1px solid #10b981 !important;
    border-left: 4px solid #10b981 !important;
}

/* Yellow Warning/Incomplete Boxes */
[data-theme="dark"] div[style*="background: #fef3c7"],
[data-theme="dark"] div[style*="background-color: #fef3c7"],
[data-theme="dark"] div[style*="#fef3c7"],
[data-theme="dark"] div[style*="background: #fff3cd"],
[data-theme="dark"] div[style*="background-color: #fff3cd"],
[data-theme="dark"] div[style*="#fff3cd"] {
    background: #451a03 !important;
    background-color: #451a03 !important;
    border: 1px solid #f59e0b !important;
    border-left: 4px solid #f59e0b !important;
}

/* Feature Highlights & Tips */
.feature-highlight {
    background-color: rgba(245, 158, 11, 0.1) !important;
    border: 1px solid rgba(245, 158, 11, 0.3) !important;
    border-left: 4px solid #f59e0b !important;
    color: #92400e !important;
}

[data-theme="dark"] .feature-highlight {
    background-color: rgba(245, 158, 11, 0.15) !important;
    border: 1px solid rgba(245, 158, 11, 0.3) !important;
    border-left: 4px solid #fbbf24 !important;
    color: #fed7aa !important;
}

[data-theme="dark"] .feature-highlight strong {
    color: #fdba74 !important;
}

/* =============================================================================
   VOCABULARY WORD ITEMS & INTERACTIONS
   ============================================================================= */

/* Default State - Visible Borders */
[data-theme="dark"] .word-card,
[data-theme="dark"] .generated-word,
[data-theme="dark"] .word-item,
[data-theme="dark"] .word,
[data-theme="dark"] .generated-words > *,
[data-theme="dark"] .word-list > *,
[data-theme="dark"] .words-container > *,
[data-theme="dark"] span[onclick],
[data-theme="dark"] div[onclick],
[data-theme="dark"] #generated-words *,
[data-theme="dark"] .words-display *,
[data-theme="dark"] .word-display * {
    border: 1px solid var(--border-medium) !important;
    background-color: var(--bg-secondary) !important;
    transition: all var(--transition) !important;
    border-radius: var(--radius-md) !important;
    padding: 8px 12px !important;
    margin: 4px !important;
    display: inline-block !important;
}

/* Hover Effects */
[data-theme="dark"] .word-card:hover,
[data-theme="dark"] .generated-word:hover,
[data-theme="dark"] .word-item:hover,
[data-theme="dark"] .word:hover,
[data-theme="dark"] .generated-words > *:hover,
[data-theme="dark"] .word-list > *:hover,
[data-theme="dark"] .words-container > *:hover,
[data-theme="dark"] span[onclick]:hover,
[data-theme="dark"] div[onclick]:hover,
[data-theme="dark"] #generated-words *:hover,
[data-theme="dark"] .words-display *:hover,
[data-theme="dark"] .word-display *:hover {
    border: 1px solid var(--accent-primary) !important;
    background-color: var(--bg-hover) !important;
    transform: translateY(-2px) !important;
    box-shadow: var(--shadow-md) !important;
}

/* =============================================================================
   DARK MODE TEXT VISIBILITY FIXES
   ============================================================================= */

/* Universal Text Fixes */
[data-theme="dark"] * {
    color: var(--text-secondary) !important;
}

/* Headers */
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4,
[data-theme="dark"] h5,
[data-theme="dark"] h6 {
    color: var(--text-primary) !important;
}

/* Strong Text */
[data-theme="dark"] strong,
[data-theme="dark"] b {
    color: var(--text-primary) !important;
}

/* Buttons */
[data-theme="dark"] .btn,
[data-theme="dark"] .btn *,
[data-theme="dark"] button,
[data-theme="dark"] button * {
    color: var(--text-white) !important;
}

/* Accent Elements */
[data-theme="dark"] .phoneme,
[data-theme="dark"] .morpheme-tag,
[data-theme="dark"] .confidence-high,
[data-theme="dark"] .confidence-medium,
[data-theme="dark"] .confidence-low,
[data-theme="dark"] .sentence-category,
[data-theme="dark"] .word-pos {
    color: var(--text-white) !important;
}

/* Links & Accent Text */
[data-theme="dark"] .word-conlang,
[data-theme="dark"] .stat-number,
[data-theme="dark"] .nav-tab.active {
    color: var(--accent-primary) !important;
}

/* Form Elements */
[data-theme="dark"] label,
[data-theme="dark"] .form-group label,
[data-theme="dark"] small,
[data-theme="dark"] .text-sm {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .form-control,
[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    color: var(--text-primary) !important;
    background-color: #1e293b !important;
    border-color: var(--border-medium) !important;
}

[data-theme="dark"] .form-control:focus {
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1) !important;
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted) !important;
}

/* Navigation */
[data-theme="dark"] .nav-tab {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .nav-tab:hover {
    color: var(--text-primary) !important;
}

/* Hardcoded Color Overrides */
[data-theme="dark"] *[style*="color: #666"],
[data-theme="dark"] *[style*="color: #555"],
[data-theme="dark"] *[style*="color: #888"],
[data-theme="dark"] *[style*="color: #999"],
[data-theme="dark"] *[style*="color: #333"],
[data-theme="dark"] *[style*="color: #444"] {
    color: var(--text-secondary) !important;
}

/* Word Builder Text */
[data-theme="dark"] .word-builder,
[data-theme="dark"] .word-builder p,
[data-theme="dark"] .word-builder span:not(.btn):not(button),
[data-theme="dark"] .word-builder div:not(.btn):not(.form-control) {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .word-builder h4,
[data-theme="dark"] .word-builder strong {
    color: var(--text-primary) !important;
}

/* =============================================================================
   BACKGROUND COLOR FIXES FOR LIGHT ELEMENTS
   ============================================================================= */

/* White Backgrounds */
[data-theme="dark"] div[style*="background: white"],
[data-theme="dark"] div[style*="background-color: white"] {
    background: var(--bg-secondary) !important;
    color: var(--text-secondary) !important;
}

[data-theme="dark"] div[style*="background: white"] strong {
    color: var(--text-primary) !important;
}

/* Light Gray Backgrounds */
[data-theme="dark"] div[style*="background: #f8f9fa"],
[data-theme="dark"] div[style*="background-color: #f8f9fa"],
[data-theme="dark"] div[style*="background: #f1f5f9"],
[data-theme="dark"] div[style*="background-color: #f1f5f9"] {
    background: var(--bg-accent) !important;
    color: var(--text-secondary) !important;
}

/* Sample Text Fixes */
[data-theme="dark"] div[style*="background: #f0f8f0"],
[data-theme="dark"] div[style*="background-color: #f0f8f0"] {
    background: var(--bg-accent) !important;
    border-color: var(--accent-success) !important;
    color: var(--text-secondary) !important;
}

[data-theme="dark"] div[style*="background: #f0f8f0"] em {
    color: var(--accent-success) !important;
}

[data-theme="dark"] #sample-text-content div {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] #sample-text-content strong {
    color: var(--text-primary) !important;
}

[data-theme="dark"] #sample-text-content em {
    color: var(--accent-success) !important;
}

/* Container Background Fixes */
[data-theme="dark"] .intro-card,
[data-theme="dark"] .quick-start-item,
[data-theme="dark"] .section-card,
[data-theme="dark"] .word-card,
[data-theme="dark"] .sentence-pair-card,
[data-theme="dark"] .affix-item,
[data-theme="dark"] .search-filter-bar,
[data-theme="dark"] .modal-content,
[data-theme="dark"] .sample-card,
[data-theme="dark"] .checkbox-item,
[data-theme="dark"] .generated-word-display,
[data-theme="dark"] .analysis-section,
[data-theme="dark"] .morphology-breakdown,
[data-theme="dark"] .translation-suggestion,
[data-theme="dark"] .grammar-rule-example,
[data-theme="dark"] .affix-example,
[data-theme="dark"] .detailed-options,
[data-theme="dark"] .result-card,
[data-theme="dark"] .stat-card {
    background-color: var(--bg-secondary) !important;
}

/* =============================================================================
   UTILITY STYLES
   ============================================================================= */

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background-color: var(--bg-accent);
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-medium);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--border-dark);
}

/* Selection */
::selection {
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--text-primary);
}

[data-theme="dark"] ::selection {
    background-color: rgba(96, 165, 250, 0.3);
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-light);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */

@media (min-width: 640px) {
    .header {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .form-control {
        padding: 14px 18px;
    }
}

@media (min-width: 1024px) {
    .header h1 {
        font-size: 2.25rem;
    }
    
    .form-control {
        padding: 16px 20px;
    }
}

@media (max-width: 639px) {
    .dark-mode-toggle {
        top: var(--spacing-md);
        right: var(--spacing-md);
        width: 40px;
        height: 40px;
        font-size: 1em;
    }
}

/* =============================================================================
   ACCESSIBILITY & PREFERENCES
   ============================================================================= */

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-light: #000000;
        --border-medium: #000000;
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    }
    
    .form-control {
        border-width: 2px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}