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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--color-text-dark-primary);
    background: var(--color-background-light);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

.section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 0;
}

.section > .container {
    width: 100%;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    border: none;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--color-background-white);
    color: var(--color-student-primary);
    box-shadow: var(--shadow-xs);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px var(--shadow-glow-student);
}

.btn-primary:active {
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-on-primary);
    border: 2px solid var(--color-text-on-primary);
}

.btn-secondary:hover {
    background: var(--color-background-white);
    color: var(--color-student-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.3);
}

.btn-secondary:active {
    transform: translateY(-2px);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--color-background-white);
    box-shadow: var(--shadow-xs);
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-student-primary);
    letter-spacing: 1px;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.logo:hover {
    transform: scale(1.08);
    letter-spacing: 2px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 20px;
    padding: 0;
    margin: 0;
    justify-content: center;
    align-items: center;
}

.nav-link {
    color: var(--color-text-dark-primary);
    font-size: 1.6rem;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

.nav-link:hover {
    color: var(--color-teacher-primary);
    transform: translateY(-3px) scale(1.1);
}

.nav-link i {
    display: inline-block;
    filter: drop-shadow(0 0 0 transparent);
    transition: filter 0.3s ease;
}

.nav-link:hover i {
    filter: drop-shadow(0 4px 8px var(--shadow-glow-teacher));
}

.nav-cta {
    background: var(--color-background-dark);
    color: var(--color-text-on-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-cta:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    background: var(--color-background-dark-tertiary);
}

.hero {
    background: linear-gradient(135deg, var(--color-teacher-primary), var(--color-teacher-secondary));
    color: var(--color-text-on-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    animation: floatSlow 15s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 50%;
    animation: floatSlow 18s ease-in-out infinite reverse;
}

@keyframes floatSlow {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -30px) rotate(3deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(-3deg);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 700;
    margin-bottom: 2rem;
    line-height: 1.2;
}

.hero-description {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

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

.hero-buttons .btn {
    min-width: 150px;
}

.hero-buttons .btn-primary {
    background: var(--color-background-white);
    color: var(--color-teacher-primary);
    box-shadow: var(--shadow-xs);
}

.hero-buttons .btn-primary:hover {
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.4);
}

.hero-buttons .btn-secondary:hover {
    background: var(--color-background-white);
    color: var(--color-teacher-primary);
}

.students-section {
    background: linear-gradient(135deg, var(--color-student-secondary), var(--color-student-primary));
    color: var(--color-text-on-primary);
}

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

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-card:hover {
    transform: translateY(-12px);
    background: rgba(255, 255, 255, 0.18);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.4);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-title {
    transform: translateX(5px);
}

.feature-description {
    opacity: 0.9;
    line-height: 1.7;
}

.teachers-section {
    background: linear-gradient(135deg, var(--color-teacher-primary), var(--color-teacher-secondary));
    color: var(--color-text-on-primary);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 4rem;
}

.benefit-card {
    background: var(--color-background-white);
    color: var(--color-text-dark-primary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}

.benefit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(76, 175, 174, 0.1), transparent);
    transition: left 0.6s ease;
}

.benefit-card:hover::before {
    left: 100%;
}

.benefit-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 50px var(--shadow-glow-teacher);
}

.benefit-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-teacher-primary);
    margin-bottom: 0.5rem;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.benefit-card:hover .benefit-number {
    transform: scale(1.15) rotate(-5deg);
}

.benefit-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-dark-primary);
}

.benefit-description {
    color: var(--color-text-dark-secondary);
    line-height: 1.7;
}

.about-section {
    background: var(--color-background-white);
}

.about-section .section-title {
    color: var(--color-text-dark-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    color: var(--color-student-primary);
    margin-bottom: 1rem;
}

.about-text p {
    color: var(--color-text-dark-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-list {
    list-style: none;
}

.about-list li {
    padding: 0.5rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--color-text-dark-secondary);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.about-list li:hover {
    transform: translateX(8px);
    color: var(--color-text-dark-primary);
}

.about-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-student-primary);
    font-weight: 700;
    font-size: 1.25rem;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.about-list li:hover::before {
    transform: scale(1.3) rotate(360deg);
}

.about-image {
    background: linear-gradient(135deg, var(--color-student-secondary), var(--color-student-primary));
    border-radius: 12px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-on-primary);
    font-size: 5rem;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}

.about-image::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: rotateGradient 10s linear infinite;
}

@keyframes rotateGradient {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.about-image:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 60px var(--shadow-glow-student);
    border-radius: 24px;
}

.testimonials-section {
    background: var(--color-background-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--color-background-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-xs);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

.testimonial-card::after {
    content: '"';
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 5rem;
    color: var(--color-teacher-primary);
    opacity: 0.1;
    font-family: Georgia, serif;
    transition: all 0.4s ease;
}

.testimonial-card:hover::after {
    opacity: 0.2;
    transform: scale(1.2);
}

.testimonial-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.testimonial-stars {
    color: var(--color-teacher-primary);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.testimonial-card:hover .testimonial-stars {
    transform: scale(1.1);
    letter-spacing: 2px;
}

.testimonial-text {
    color: var(--color-text-dark-secondary);
    font-style: italic;
    margin-bottom: 1rem;
    line-height: 1.7;
}

.testimonial-author {
    font-weight: 600;
    color: var(--color-text-dark-primary);
    margin-bottom: 0.25rem;
}

.testimonial-role {
    color: var(--color-text-dark-secondary);
    font-size: 0.9rem;
}

.contact-section {
    background: linear-gradient(135deg, var(--color-student-primary), var(--color-student-secondary));
    color: var(--color-text-on-primary);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact-section::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 50%;
    animation: floatSlow 18s ease-in-out infinite;
}

.contact-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 450px;
    height: 450px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    animation: floatSlow 15s ease-in-out infinite reverse;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.contact-input,
.contact-textarea {
    width: 100%;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 20px;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: var(--color-background-white);
    color: var(--color-text-dark-primary);
}

.contact-textarea {
    min-height: 150px;
    resize: vertical;
    border-radius: 20px;
}

.contact-input:focus,
.contact-textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

.contact-btn {
    background: var(--color-background-white);
    color: var(--color-student-primary);
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    font-family: 'Poppins', sans-serif;
    position: relative;
    overflow: hidden;
}

.contact-btn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.3);
}

.footer {
    background: var(--color-teacher-primary);
    color: var(--color-text-on-primary);
    padding: 4rem 0 2rem;
    position: relative;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 4rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-text-on-primary);
}

.footer-section p {
    color: var(--color-text-light-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--color-text-light-secondary);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: inline-block;
    position: relative;
}

.footer-links a::before {
    position: absolute;
    left: -20px;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.footer-links a:hover::before {
    left: -15px;
    opacity: 1;
}

.footer-links a:hover {
    color: var(--color-text-on-primary);
    transform: translateX(8px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 1rem;
    text-align: center;
    color: var(--color-text-light-secondary);
}

@media (max-width: 1024px) {
    .nav-menu {
        gap: 15px;
    }

    .nav-link {
        font-size: 1.4rem;
    }

    .nav-cta {
        padding: 0.65rem 1.25rem;
        font-size: 0.95rem;
    }

    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

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

    .testimonials-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0;
    }
    
    .nav {
        padding: 0.75rem 1rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .nav-menu {
        display: flex;
        gap: 12px;
    }

    .nav-link {
        font-size: 1.3rem;
    }

    .nav-cta {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-image {
        height: 300px;
        font-size: 4rem;
    }

    .hero-buttons,
    .contact-form {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }

    .contact-input,
    .contact-textarea {
        width: 100%;
    }

    .contact-btn {
        width: 100%;
        max-width: 300px;
    }

    .section {
        padding: 4rem 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: 0.5rem 0;
    }

    .logo {
        font-size: 1.35rem;
    }

    .container {
        padding: 1rem;
    }

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

    .hero-description {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    .about-image {
        height: 250px;
        font-size: 3rem;
    }

    .feature-title,
    .benefit-title {
        font-size: 1.25rem;
    }

    .benefit-number {
        font-size: 2.5rem;
    }

    .btn {
        padding: 0.875rem 1.75rem;
        font-size: 0.95rem;
    }

    .hero::before,
    .hero::after,
    .contact-section::before,
    .contact-section::after {
        width: 300px;
        height: 300px;
    }
}

@media (max-width: 360px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .about-image {
        height: 200px;
        font-size: 2.5rem;
    }
}

@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .benefits-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

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