/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #1e40af;
    --secondary-green: #059669;
    --accent-orange: #f97316;
    --dark-blue: #1e3a8a;
    --light-blue: #3b82f6;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-600: #4b5563;
    --gray-800: #1f2937;
    --white: #ffffff;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

.logo span {
    color: var(--secondary-green);
}

.logo:hover {
    color: var(--light-blue);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-green);
    transition: width 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-blue);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-800);
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--secondary-green);
    position: relative;
}

.hero-text {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.btn {
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(30, 64, 175, 0.2);
}

.btn-secondary {
    background: var(--secondary-green);
    color: var(--white);
}

.btn-secondary:hover {
    background: #047857;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(5, 150, 105, 0.2);
}

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

.btn-light:hover {
    background: var(--gray-50);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}

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

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat {
    text-align: left;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.hero-image .image-placeholder {
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Services Preview */
.services-preview {
    padding: 80px 0;
    background: var(--white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    color: var(--gray-600);
    font-size: 1.125rem;
    margin-bottom: 3rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--gray-100);
    transition: all 0.3s ease;
}

.service-card:hover {
    border-color: var(--secondary-green);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.service-card h3 {
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: 0.75rem;
}

.service-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* Why Choose Us */
.why-choose {
    padding: 80px 0;
    background: var(--gray-50);
}

.why-choose .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feature {
    display: flex;
    gap: 1rem;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--secondary-green);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.feature h3 {
    font-size: 1.25rem;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.feature p {
    color: var(--gray-600);
}

.why-image .image-placeholder {
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* CTA Section */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-col h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-col p {
    color: var(--gray-200);
    line-height: 1.7;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.5rem;
    color: var(--gray-200);
}

.footer-col a {
    color: var(--gray-200);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-col a:hover {
    color: var(--secondary-green);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-200);
}

/* Contact Page Styles */
.page-header {
    padding: 60px 0 40px;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.125rem;
    color: var(--gray-600);
}

.contact-section {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.info-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--gray-100);
}

.info-card h3 {
    font-size: 1.25rem;
    color: var(--gray-800);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

.info-card a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
}

.info-card a:hover {
    color: var(--secondary-green);
}

.contact-form {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    border: 2px solid var(--gray-100);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    width: 100%;
    padding: 14px 32px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-submit:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(30, 64, 175, 0.2);
}

/* Content Pages */
.content-section {
    padding: 80px 0;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.content-wrapper h2 {
    font-size: 2rem;
    color: var(--gray-800);
    margin: 2rem 0 1rem;
}

.content-wrapper h3 {
    font-size: 1.5rem;
    color: var(--gray-800);
    margin: 1.5rem 0 1rem;
}

.content-wrapper p {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.content-wrapper ul {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.content-wrapper li {
    margin-bottom: 0.5rem;
}

.highlight-box {
    background: var(--gray-50);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--secondary-green);
    margin: 2rem 0;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.resource-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--gray-100);
    transition: all 0.3s ease;
}

.resource-card:hover {
    border-color: var(--secondary-green);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.resource-card h3 {
    font-size: 1.25rem;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.resource-card p {
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.resource-link {
    display: inline-block;
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.resource-link:hover {
    color: var(--secondary-green);
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 1rem 2rem;
    }

    .hero .container,
    .why-choose .container,
    .contact-grid {
        grid-template-columns: 1fr;
    }

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

    .section-title {
        font-size: 2rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .hero-buttons,
    .cta-buttons {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .services-grid,
    .resource-grid {
        grid-template-columns: 1fr;
    }
}

/* Evaluation Method Buttons */
.evaluation-method-btn {
    flex: 1;
    padding: 12px 24px;
    border: 2px solid var(--gray-200);
    background: white;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.evaluation-method-btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.evaluation-method-btn.active {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

/* Vocabulary Card Styles */
.vocab-word {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.vocab-pronunciation {
    font-size: 1.25rem;
    color: var(--gray-600);
    font-style: italic;
    margin-bottom: 1rem;
}

.vocab-type {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--secondary-green);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.vocab-meaning {
    font-size: 1.125rem;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.vocab-bengali {
    font-size: 1.25rem;
    color: var(--secondary-green);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.vocab-example {
    background: var(--gray-50);
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-orange);
    font-style: italic;
    color: var(--gray-700);
}

/* Quiz Option Buttons */
.quiz-option {
    width: 100%;
    padding: 1rem 1.5rem;
    text-align: left;
    border: 2px solid var(--gray-200);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.quiz-option:hover {
    border-color: var(--primary-blue);
    background: var(--gray-50);
}

.quiz-option.correct {
    border-color: var(--secondary-green);
    background: #d1fae5;
}

.quiz-option.incorrect {
    border-color: #ef4444;
    background: #fee2e2;
}

.quiz-option:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

/* Evaluation Result Styles */
.evaluation-section {
    margin-bottom: 1.5rem;
}

.evaluation-section h4 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.band-score {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--secondary-green);
    color: white;
    border-radius: 8px;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 1rem 0;
}

.feedback-list {
    list-style: none;
    padding-left: 0;
}

.feedback-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.feedback-list li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--secondary-green);
    font-size: 1.5rem;
    line-height: 1;
}

.strengths-list li:before {
    content: "✓";
    color: var(--secondary-green);
}

.improvements-list li:before {
    content: "⚠";
    color: var(--accent-orange);
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 40px 0;
    }

    .services-preview,
    .why-choose,
    .content-section,
    .contact-section {
        padding: 40px 0;
    }

    .cta {
        padding: 40px 0;
    }

    .evaluation-method-btn {
        font-size: 0.875rem;
        padding: 10px 16px;
    }

    .vocab-word {
        font-size: 2rem;
    }
}