/*
Theme Name: UKR Language Learning
Theme URI: https://ukr.25language.com
Author: 25Language Team
Author URI: https://25language.com
Description: Тема для вивчення європейських мов для україномовних - قالب تعليمي لتعلم اللغات الأوروبية للناطقين بالأوكرانية
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ukr-language
Tags: education, languages, ukrainian, rtl-language-support, custom-colors
*/

/* ==========================================
   CSS Variables - Ukrainian Colors
   ========================================== */
:root {
    /* Primary Colors - Ukrainian Flag */
    --ukr-blue: #005BBB;
    --ukr-yellow: #FFD500;
    --ukr-blue-light: #4A90D9;
    --ukr-blue-dark: #003D7A;
    --ukr-yellow-light: #FFE44D;
    --ukr-yellow-dark: #E6BF00;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Semantic Colors */
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    
    /* Typography */
    --font-primary: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-ukrainian: 'Noto Sans', 'Arial', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    margin: 0;
    padding: 0;
}

/* Ukrainian text support */
[lang="uk"], .ukr-text {
    font-family: var(--font-ukrainian);
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--ukr-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--ukr-blue-dark);
    text-decoration: underline;
}

/* ==========================================
   Layout
   ========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================
   Header
   ========================================== */
.site-header {
    background: linear-gradient(135deg, var(--ukr-blue) 0%, var(--ukr-blue-dark) 100%);
    color: var(--white);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-logo img {
    height: 50px;
    width: auto;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin: 0;
}

.site-title a {
    color: var(--white);
    text-decoration: none;
}

.site-title span {
    color: var(--ukr-yellow);
}

/* Navigation */
.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-lg);
}

.main-nav a {
    color: var(--white);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    background-color: var(--ukr-yellow);
    color: var(--ukr-blue-dark);
    text-decoration: none;
}

/* Mobile Navigation */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .main-nav {
        display: none;
        width: 100%;
        order: 3;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .main-nav a {
        display: block;
        text-align: center;
    }
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    background: linear-gradient(135deg, var(--ukr-blue) 0%, var(--ukr-blue-light) 50%, var(--ukr-blue) 100%);
    color: var(--white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, var(--ukr-yellow) 0%, transparent 100%);
    opacity: 0.1;
}

.hero h1 {
    font-size: 3rem;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    opacity: 0.9;
}

/* ==========================================
   Language Cards Grid
   ========================================== */
.languages-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--gray-50);
}

.languages-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--ukr-blue-dark);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.language-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.language-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--ukr-blue) 0%, var(--ukr-yellow) 100%);
}

.language-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--ukr-blue);
}

.language-card .flag {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.language-card h3 {
    color: var(--ukr-blue-dark);
    margin-bottom: var(--spacing-sm);
}

.language-card .language-ukr {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.language-card .lesson-count {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--ukr-yellow-light);
    color: var(--ukr-blue-dark);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.language-card .btn-start {
    display: block;
    margin-top: var(--spacing-lg);
    background: var(--ukr-blue);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.language-card .btn-start:hover {
    background: var(--ukr-blue-dark);
    text-decoration: none;
}

/* ==========================================
   Lesson Cards
   ========================================== */
.lessons-section {
    padding: var(--spacing-3xl) 0;
}

.lesson-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--ukr-blue);
    transition: all var(--transition-fast);
}

.lesson-card:hover {
    box-shadow: var(--shadow-md);
    border-left-color: var(--ukr-yellow);
}

.lesson-card .lesson-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--ukr-blue);
    color: var(--white);
    border-radius: var(--radius-full);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.lesson-card h3 {
    margin-bottom: var(--spacing-sm);
}

.lesson-card .lesson-meta {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.lesson-card .lesson-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.lesson-card .difficulty {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty.beginner {
    background: #D1FAE5;
    color: #065F46;
}

.difficulty.intermediate {
    background: #FEF3C7;
    color: #92400E;
}

.difficulty.advanced {
    background: #FEE2E2;
    color: #991B1B;
}

/* ==========================================
   Quiz Section
   ========================================== */
.quiz-container {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    max-width: 700px;
    margin: var(--spacing-2xl) auto;
}

.quiz-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--gray-100);
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.quiz-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ukr-blue) 0%, var(--ukr-yellow) 100%);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.quiz-question {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.quiz-options {
    display: grid;
    gap: var(--spacing-md);
}

.quiz-option {
    display: block;
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    font-size: 1.125rem;
}

.quiz-option:hover {
    border-color: var(--ukr-blue);
    background: var(--white);
}

.quiz-option.selected {
    border-color: var(--ukr-blue);
    background: rgba(0, 91, 187, 0.1);
}

.quiz-option.correct {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.quiz-feedback {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
    font-weight: 600;
}

.quiz-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.quiz-feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.quiz-result {
    text-align: center;
    padding: var(--spacing-2xl);
}

.quiz-result .score {
    font-size: 4rem;
    font-weight: 700;
    color: var(--ukr-blue);
    margin-bottom: var(--spacing-md);
}

.quiz-result .score-label {
    font-size: 1.25rem;
    color: var(--gray-600);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--ukr-blue);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--ukr-blue-dark);
    color: var(--white);
    text-decoration: none;
}

.btn-secondary {
    background: var(--ukr-yellow);
    color: var(--ukr-blue-dark);
}

.btn-secondary:hover {
    background: var(--ukr-yellow-dark);
    text-decoration: none;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--ukr-blue);
    color: var(--ukr-blue);
}

.btn-outline:hover {
    background: var(--ukr-blue);
    color: var(--white);
    text-decoration: none;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.125rem;
}

/* ==========================================
   Footer
   ========================================== */
.site-footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    font-size: 1.125rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--ukr-yellow);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-700);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    margin: 0;
    font-size: 0.875rem;
}

.ukraine-support {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--ukr-yellow);
}

/* ==========================================
   Utilities
   ========================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-ukr-blue { color: var(--ukr-blue); }
.text-ukr-yellow { color: var(--ukr-yellow); }

.bg-ukr-blue { background-color: var(--ukr-blue); }
.bg-ukr-yellow { background-color: var(--ukr-yellow); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

.hidden { display: none; }
.visible { display: block; }

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 992px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .hero h1 { font-size: 2.5rem; }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 1rem; }
    
    .languages-grid {
        grid-template-columns: 1fr !important;
    }
    
    .quiz-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-lg);
    }
    
    /* Header Mobile */
    .site-header .container {
        flex-wrap: wrap;
    }
    
    .site-branding img {
        max-width: 150px;
    }
    
    /* Hero Buttons */
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }
    
    /* Language Cards */
    .language-card {
        padding: 25px 20px;
    }
    
    .language-card .flag {
        font-size: 3rem;
    }
    
    /* Lessons Grid */
    .lessons-grid {
        grid-template-columns: 1fr !important;
    }
    
    /* Subcategories Grid */
    .subcategories-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-section ul {
        padding-left: 0;
    }
    
    .footer-grid {
        grid-template-columns: 1fr !important;
        gap: 30px !important;
        text-align: center;
    }
    
    .footer-section ul li a {
        justify-content: center;
    }
    
    /* Category Hero */
    .category-hero {
        padding: 40px 0 !important;
    }
    
    .category-hero h1 {
        font-size: 1.8rem !important;
    }
    
    /* Lesson Card */
    .lesson-card {
        margin-bottom: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero h1 { font-size: 1.5rem; }
    .hero p { font-size: 0.95rem; }
    
    .btn-lg {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }
    
    /* Subcategories */
    .subcategories-grid {
        grid-template-columns: 1fr !important;
    }
    
    .subcat-card {
        padding: 20px 15px !important;
    }
    
    .subcat-card div:first-child {
        font-size: 2rem !important;
    }
    
    /* Language Card */
    .language-card {
        padding: 20px 15px;
    }
    
    .language-card .flag {
        font-size: 2.5rem;
    }
    
    .language-card h3 {
        font-size: 1.1rem;
    }
    
    /* Category Hero */
    .category-hero > div:first-child {
        font-size: 3rem !important;
    }
    
    .category-hero h1 {
        font-size: 1.5rem !important;
    }
    
    /* Footer */
    .footer-bottom {
        padding: 20px 10px !important;
    }
    
    .footer-bottom p {
        font-size: 0.85rem;
    }
    
    /* Quiz */
    .quiz-container {
        padding: 15px;
        margin: 10px;
    }
    
    .quiz-question h3 {
        font-size: 1.1rem;
    }
    
    .quiz-option {
        padding: 12px 15px;
        font-size: 0.95rem;
    }
}

/* Touch devices - larger tap targets */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .quiz-option,
    .nav-links a,
    .main-nav a {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .quiz-option {
        padding: 15px 20px;
    }
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {
    .site-header,
    .site-footer,
    .main-nav {
        display: none;
    }
    
    .container {
        max-width: 100%;
    }
    
    a {
        text-decoration: underline;
    }
}