:root {
    /* Randomization: Cyber-Education Palette */
    --primary-color: #6366f1;
    /* Indigo */
    --primary-hover: #4f46e5;
    --accent-color: #06b6d4;
    /* Cyan */
    --bg-dark: #0f172a;
    /* Slate 900 */
    --bg-card: #1e293b;
    /* Slate 800 */
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;

    --font-main: 'Sora', sans-serif;
    --transition: all 0.3s ease;
    --radius: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

.section {
    padding: 80px 0;
}

.section__title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-size: 1rem;
    text-align: center;
}

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

.btn--primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

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

.btn--outline:hover {
    background: var(--accent-color);
    color: var(--bg-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(6, 182, 212, 0.4);
}

.btn--small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn--full {
    width: 100%;
}

/* Header */
.header {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 700;
    font-size: 1.2rem;
    transition: var(--transition);
}

.logo:hover {
    color: var(--accent-color);
    transform: translateY(-2px);
}

.nav__list {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav__link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav__link:hover {
    color: var(--accent-color);
}

.burger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
    transition: var(--transition);
}

.burger:hover span {
    background-color: var(--accent-color);
}

.burger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 600px;
    position: relative;
    display: flex;
    align-items: center;
    background-image: url('images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(99, 102, 241, 0.4));
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.badge:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.hero__title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero__subtitle {
    font-size: 1.2rem;
    color: #e2e8f0;
    margin-bottom: 40px;
}

.hero__actions {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Features */
.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

.card__icon {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 20px;
    transition: var(--transition);
}

.card:hover .card__icon {
    color: var(--primary-color);
    transform: scale(1.1);
}

.card h3 {
    margin-bottom: 15px;
}

.card p {
    color: var(--text-muted);
}

/* Services Grid */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 300px);
    gap: 20px;
}

.service-card {
    position: relative;
    border-radius: var(--radius);
    background-size: cover;
    background-position: center;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.service-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.3));
    transition: var(--transition);
}

.service-card:hover .service-card__overlay {
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.2));
}

.service-card--large {
    grid-column: span 2;
    grid-row: span 2;
}

.service-card--medium {
    grid-column: span 1;
    grid-row: span 1;
}

.service-card--small {
    grid-column: span 1;
    grid-row: span 1;
}

.service-card__content {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 30px;
    color: white;
}

.service-card__content h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: white;
}

.service-card--large .service-card__content h3 {
    font-size: 2.5rem;
}

.service-card__content p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

.service-card--large .service-card__content p {
    font-size: 1.3rem;
}

/* Testimonials */
.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.review-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 40px 30px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.review-card__avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 25px;
    border: 4px solid var(--primary-color);
    transition: var(--transition);
    flex-shrink: 0;
}

.review-card:hover .review-card__avatar {
    border-color: var(--accent-color);
    transform: scale(1.05);
}

.review-card__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.review-card__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.review-card p {
    font-style: italic;
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.6;
}

.review-card span {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 1rem;
}

/* Contacts */
.contacts__wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 50px;
}

.contacts__info,
.contacts__form-wrapper {
    flex: 1;
    min-width: 300px;
}

.contacts__list {
    list-style: none;
    margin-top: 30px;
}

.contacts__list li {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 1.1rem;
    transition: var(--transition);
    padding: 10px;
    border-radius: 8px;
}

.contacts__list li:hover {
    background: rgba(255, 255, 255, 0.03);
    transform: translateX(5px);
}

.contacts__list i {
    color: var(--accent-color);
    transition: var(--transition);
}

.contacts__list li:hover i {
    color: var(--primary-color);
    transform: scale(1.2);
}

/* Form */
.form {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius);
}

.form__group {
    margin-bottom: 20px;
}

.form__input {
    width: 100%;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: white;
    font-family: inherit;
    transition: var(--transition);
}

.form__input:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.3);
}

.form__input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form__captcha {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.form__input--small {
    width: 80px;
}

.form__message {
    margin-top: 15px;
    text-align: center;
    font-size: 0.9rem;
}

.form__message.success {
    color: var(--success);
}

.form__message.error {
    color: #ef4444;
}

/* Footer */
.footer {
    background: #020617;
    padding: 60px 0 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer__col h4 {
    color: white;
    margin-bottom: 20px;
}

.footer__col ul {
    list-style: none;
}

.footer__col ul li {
    margin-bottom: 10px;
}

.footer__col a,
.footer__col button {
    color: var(--text-muted);
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    padding: 0;
    transition: var(--transition);
}

.footer__col a:hover,
.footer__col button:hover {
    color: var(--accent-color);
}

.footer__bottom {
    text-align: center;
    color: #475569;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 20px;
}

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: var(--bg-card);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    padding: 40px;
    border-radius: var(--radius);
    z-index: 2001;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal.active {
    opacity: 1;
    pointer-events: all;
    transform: translate(-50%, -50%) scale(1);
}

.modal-content {
    overflow-y: auto;
    max-height: calc(80vh - 80px);
    padding-right: 10px;
}

.modal-content h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.modal-content h4 {
    margin-top: 25px;
    margin-bottom: 10px;
    color: var(--accent-color);
    font-size: 1.2rem;
}

.modal-content p {
    margin-bottom: 15px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

.modal-content ul,
.modal-content ol {
    padding-left: 25px;
    margin-bottom: 20px;
    line-height: 1.8;
}

.modal-content li {
    margin-bottom: 10px;
    color: rgba(255, 255, 255, 0.9);
}

.modal-content a {
    color: var(--accent-color);
    text-decoration: underline;
    transition: var(--transition);
}

.modal-content a:hover {
    color: var(--primary-color);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
    transform: rotate(90deg) scale(1.1);
}


/* Responsive */
@media (max-width: 1024px) {
    .nav {
        position: fixed;
        top: 80px;
        right: -100%;
        background: var(--bg-card);
        width: 100%;
        height: calc(100vh - 80px);
        flex-direction: column;
        justify-content: center;
        transition: 0.4s;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav.active {
        right: 0;
    }

    .nav__list {
        flex-direction: column;
        align-items: center;
        gap: 40px;
        font-size: 1.5rem;
        margin-top: 50px;
    }

    .burger {
        display: flex;
    }

    .burger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }

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

    .burger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    .services__grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .service-card--large,
    .service-card--medium,
    .service-card--small {
        grid-column: span 1;
        grid-row: span 1;
        min-height: 300px;
    }

    .service-card--large .service-card__content h3 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .hero__title {
        font-size: 2.5rem;
    }

    .section__title {
        font-size: 2rem;
    }
}