/* =============================================
   FREE ENGLISH - FUN & SIMPLE DESIGN SYSTEM
   ============================================= */

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    /* Colors - Playful & Cheerful Palette */
    --primary-color: #F0C42A;
    /* Warm sunshine yellow */
    --secondary-color: #67C2E1;
    /* Bright sky blue */
    --accent-color: #1E6A3A;
    /* Fresh growth green */

    --success-color: #10b981;
    /* Success green */
    --error-color: #ef4444;
    /* Error red */
    --warning-color: #f59e0b;
    /* Warning orange */

    --text-color: #2d3748;
    /* Dark gray for readability */
    --text-light: #718096;
    /* Light gray for secondary text */
    --bg-color: #FFFFFF;
    /* Clean white background */
    --bg-light: #F7FAFC;
    /* Very light gray */
    --border-color: #E2E8F0;
    /* Subtle borders */

    /* Typography */
    --font-family: 'Rubik', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius - Friendly & Rounded */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* ===== GLOBAL RESETS & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
    height: 100%;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--text-color);
    background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
}

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

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: 2rem;
    margin-top: var(--spacing-xl);
}

h3 {
    font-size: 1.5rem;
}

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

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--accent-color);
}

strong {
    font-weight: 700;
    color: var(--accent-color);
}

/* ===== CONTAINER & LAYOUT ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ===== HEADER & NAVIGATION ===== */
header {
    background: white;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--primary-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    transition: transform var(--transition-bounce);
    /* Logo on the left for LTR, right for RTL */
}

.logo:hover {
    transform: scale(1.05) rotate(-2deg);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-weight: 600;
    font-size: 1.1rem;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    transition: all var(--transition-bounce);
    position: relative;
}

.nav-links a:hover {
    background: linear-gradient(135deg, var(--primary-color), #fcd34d);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.nav-links a.active {
    background: var(--secondary-color);
    color: white;
}

/* ===== MOBILE HAMBURGER MENU ===== */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 102;
    /* Position on the right side */
}

.menu-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--accent-color);
    margin: 5px 0;
    transition: all var(--transition-base);
    border-radius: 2px;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    /* Don't capture clicks when menu is closed */
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
    /* Allow clicks to close menu when it's open */
}

@media (max-width: 768px) {
    .logo {
        margin-right: calc(38px + var(--spacing-md));
        /* Space for hamburger button (28px width + padding) + extra margin */
    }

    .menu-toggle {
        display: block;
        position: absolute;
        right: var(--spacing-md);
        top: 50%;
        transform: translateY(-50%);
        pointer-events: auto;
        /* Ensure hamburger is always clickable */
    }

    nav {
        pointer-events: none;
        /* Prevent nav from capturing clicks when menu is hidden */
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 75%;
        max-width: 320px;
        background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
        flex-direction: column;
        padding: var(--spacing-2xl) var(--spacing-lg);
        padding-top: 5rem;
        /* Space from top */
        box-shadow: -8px 0 24px rgba(0, 0, 0, 0.15);
        transition: right var(--transition-base);
        z-index: 100;
        gap: 0;
        overflow-y: auto;
        pointer-events: auto;
        /* Re-enable clicks when menu is open */
    }

    /* Add decorative top bar to menu */
    .nav-links::before {
        content: 'תפריט ניווט';
        display: block;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        padding: var(--spacing-lg);
        background: linear-gradient(135deg, var(--secondary-color) 0%, #38bdf8 100%);
        color: white;
        font-weight: 700;
        font-size: 1.3rem;
        text-align: center;
        border-bottom: 3px solid var(--primary-color);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        width: 100%;
        margin-bottom: var(--spacing-sm);
        border-bottom: 2px solid var(--border-color);
        padding-bottom: var(--spacing-sm);
        opacity: 0;
        transform: translateX(20px);
        transition: all 0.3s ease;
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    /* Staggered animation for menu items */
    .nav-links.active li {
        opacity: 1;
        transform: translateX(0);
    }

    .nav-links.active li:nth-child(1) {
        transition-delay: 0.1s;
    }

    .nav-links.active li:nth-child(2) {
        transition-delay: 0.2s;
    }

    .nav-links.active li:nth-child(3) {
        transition-delay: 0.3s;
    }

    .nav-links a {
        font-size: 1.4rem;
        padding: var(--spacing-md) var(--spacing-lg);
        width: 100%;
        text-align: center;
        border-radius: var(--radius-lg);
        display: block;
        font-weight: 700;
        background: white;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-bounce);
    }

    .nav-links a:hover,
    .nav-links a:active {
        transform: scale(1.03);
        box-shadow: var(--shadow-md);
    }

    .nav-links a.active {
        background: linear-gradient(135deg, var(--secondary-color) 0%, #38bdf8 100%);
        color: white;
        box-shadow: var(--shadow-lg);
    }

    .mobile-menu-overlay {
        display: block;
    }
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #38bdf8 100%);
    color: white;
    padding: var(--spacing-2xl) var(--spacing-md);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '🌟';
    position: absolute;
    font-size: 15rem;
    opacity: 0.1;
    top: -4rem;
    right: -3rem;
    animation: float 6s ease-in-out infinite;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color) 0%, #fcd34d 100%);
    color: var(--accent-color);
    font-weight: 700;
    font-size: 1.2rem;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-bounce);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-lg);
    color: var(--accent-color);
}

.btn:active {
    transform: translateY(-1px) scale(1.02);
}

/* ===== CARDS & GRIDS ===== */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: var(--spacing-md) auto 0;
    border-radius: var(--radius-full);
}

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

.card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-bounce);
    border: 3px solid transparent;
    text-decoration: none;
    color: var(--text-color);
}

.card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--secondary-color);
}

.card h3 {
    color: var(--secondary-color);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--text-light);
    margin: 0;
}

/* ===== CONTENT AREAS ===== */
main {
    margin-bottom: var(--spacing-2xl);
    flex: 1 0 auto;
    width: 100%;
}

footer {
    flex-shrink: 0;
    width: 100%;
}

.grammar-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    max-width: 900px;
    margin: 0 auto;
}

.example-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 3px solid var(--secondary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-left: 6px solid var(--accent-color);
}

.example-box strong {
    color: var(--accent-color);
}

.example-box ul {
    list-style: none;
    padding-left: var(--spacing-sm);
}

.example-box li {
    padding: var(--spacing-xs) 0;
    position: relative;
    padding-left: var(--spacing-lg);
}

.example-box li::before {
    content: '✓';
    color: var(--success-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* ===== QUIZ SECTION ===== */
.quiz-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 4px solid var(--secondary-color);
}

.quiz-section h2 {
    text-align: center;
    color: var(--secondary-color);
}

.quiz-container {
    margin-top: var(--spacing-lg);
}

.quiz-question {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 3px solid var(--secondary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.quiz-question::before {
    content: '❓';
    position: absolute;
    top: -20px;
    right: 20px;
    font-size: 3rem;
    opacity: 0.2;
}

.quiz-question.answered {
    opacity: 0.7;
    transform: scale(0.98);
}

.quiz-question.correct {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-color: var(--success-color);
    animation: correctShake 0.5s ease;
}

.quiz-question.wrong {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-color: var(--error-color);
    animation: wrongShake 0.5s ease;
}

@keyframes correctShake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px) rotate(-2deg);
    }

    75% {
        transform: translateX(10px) rotate(2deg);
    }
}

@keyframes wrongShake {

    0%,
    100% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-5px);
    }

    40% {
        transform: translateX(5px);
    }

    60% {
        transform: translateX(-5px);
    }

    80% {
        transform: translateX(5px);
    }
}

.quiz-question h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
}

.quiz-question p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

.quiz-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.quiz-option {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-bounce);
    font-family: var(--font-family);
    color: var(--text-color);
}

.quiz-option:hover:not(:disabled) {
    transform: translateY(-5px) scale(1.05);
    border-color: var(--secondary-color);
    box-shadow: 0 10px 20px rgba(103, 194, 225, 0.3);
}

.quiz-option:active:not(:disabled) {
    transform: translateY(-2px) scale(1.02);
}

.quiz-option:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.quiz-option.correct {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border-color: #065f46;
    animation: pulse 0.5s ease;
}

.quiz-option.wrong {
    background: linear-gradient(135deg, var(--error-color) 0%, #dc2626 100%);
    color: white;
    border-color: #991b1b;
    animation: shake 0.5s ease;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

.quiz-feedback {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    font-size: 1.1rem;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.quiz-feedback.show {
    opacity: 1;
}

.quiz-feedback.correct {
    background: #d1fae5;
    color: #065f46;
    border: 2px solid var(--success-color);
}

.quiz-feedback.wrong {
    background: #fee2e2;
    color: #991b1b;
    border: 2px solid var(--error-color);
}

.quiz-score {
    background: linear-gradient(135deg, var(--primary-color) 0%, #fcd34d 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.quiz-score h3 {
    color: #713f12;
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

#score {
    font-size: 2.5rem;
    color: var(--accent-color);
    font-weight: 900;
}

#score-message {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: var(--spacing-sm);
    min-height: 2rem;
}

/* Confetti Animation */
@keyframes confetti-fall {
    0% {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background: var(--secondary-color);
    animation: confetti-fall 3s linear;
    z-index: 1000;
}

/* ===== FOOTER ===== */
footer {
    background: linear-gradient(135deg, var(--accent-color) 0%, #166534 100%);
    color: white;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: var(--spacing-2xl);
    border-top: 4px solid var(--primary-color);
}

footer p {
    margin: 0;
    font-size: 1rem;
    opacity: 0.9;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .grammar-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .grammar-content {
        padding: var(--spacing-md);
    }

    .quiz-options {
        grid-template-columns: 1fr;
    }

    .quiz-question p {
        font-size: 1.1rem;
    }

    .quiz-option {
        font-size: 1rem;
    }
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: var(--spacing-xs);
}

.mt-2 {
    margin-top: var(--spacing-sm);
}

.mt-3 {
    margin-top: var(--spacing-md);
}

.mt-4 {
    margin-top: var(--spacing-lg);
}

.mt-5 {
    margin-top: var(--spacing-xl);
}

.mb-1 {
    margin-bottom: var(--spacing-xs);
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.mb-3 {
    margin-bottom: var(--spacing-md);
}

.mb-4 {
    margin-bottom: var(--spacing-lg);
}

.mb-5 {
    margin-bottom: var(--spacing-xl);
}

.break-word {
    word-break: break-all;
    overflow-wrap: break-word;
}