:root {
    --accent: #4a90e2;
    --accent2: #9013fe;
    --dark: #111;
    --light: #fff;
    --transition: 0.4s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: #f9f9f9;
}

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

header {
    background: var(--light);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* === Website in development mode === */
.dev-banner {
    background: #fff3cd;
    color: #856404;
    text-align: center;
    padding: 0.75rem;
    font-size: 0.95rem;
    border-bottom: 1px solid #ffeeba;
}

.dev-badge {
    position: fixed;
    bottom: 10px;
    right: 10px;
    background: var(--accent);
    color: var(--light);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    opacity: 0.8;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}


.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.2rem;
}

.logo-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

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

nav {
    display: flex;
    gap: 1.5rem;
}

nav a {
    position: relative;
}

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0%;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition);
}

nav a:hover::after {
    width: 100%;
}

.burger {
    display: none;
    font-size: 1.8rem;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu {
    display: none;
    flex-direction: column;
    background: var(--light);
    position: absolute;
    top: 70px;
    right: 20px;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    gap: 0.5rem;
}

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

/* === Hero Section === */
.hero {
    min-height: 70vh;
    background: linear-gradient(120deg, var(--accent), var(--accent2));
    color: var(--light);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.7rem 1.5rem;
    border-radius: 30px;
    background: var(--light);
    color: var(--accent);
    font-weight: 600;
    transition: var(--transition);
}

.btn:hover {
    background: var(--accent2);
    color: var(--light);
}

/* === About Section === */
section {
    padding: 4rem 2rem;
}

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

.about h3, .about p {
    text-indent: 2em;
    margin-bottom: 1rem;
}

.about > div:last-child {
    display: flex;
    justify-content: center;
}

@media (max-width: 600px) {
    .about h3 {
        text-align: center;
        text-indent: 0;
    }

    .about p {
        text-indent: 1em;
        line-height: 1.7;
        font-size: 0.95rem;
    }

    .about > div:first-child {
        text-align: center;
    }

    .contact-btn {
        display: inline-block;
        margin-top: 1rem;
    }
}

.profile-img {
    max-width: 250px;
    border-radius: 50%;
    filter: brightness(70%);
    transition: var(--transition);
    box-shadow: none;
}

.profile-img:hover {
    filter: brightness(100%);
    transform: translateY(-10px);
    animation: neonPulse 1.5s infinite alternate;
}

@keyframes neonPulse {
    from {
        box-shadow: 0 0 20px rgba(143, 21, 254, 0.6),
        0 0 40px rgba(143, 21, 254, 0.4);
    }
    to {
        box-shadow: 0 0 40px rgba(143, 21, 254, 0.9),
        0 0 80px rgba(143, 21, 254, 0.6);
    }
}

.contact-btn {
    margin-top: 1rem;
    display: inline-block;
    padding: 0.7rem 1.5rem;
    border-radius: 30px;
    background: var(--accent);
    color: var(--light);
    font-weight: 600;
    transition: var(--transition);
}

.contact-btn:hover {
    background: var(--accent2);
    color: var(--light);
}

.contact-btn:active {
    transform: scale(0.97);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* === Modal Contact Form === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 999;
}

.modal-content {
    background: var(--light);
    padding: 2rem;
    border-radius: 12px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    position: relative;
    animation: fadeInModal 0.4s ease;
}

.modal-content h3 {
    margin-bottom: 1rem;
    text-align: center;
}

.modal-content input,
.modal-content textarea {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-family: inherit;
}

.modal-content button {
    width: 100%;
}

.close-modal {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 1.5rem;
    cursor: pointer;
    color: #999;
}

@keyframes fadeInModal {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}


/* === Portfolio Section === */
.tech-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 2rem;
    font-size: 0.95rem;
}

.tech-table th,
.tech-table td {
    border: 1px solid #ccc;
    padding: 0.75rem;
    text-align: left;
}

.tech-table th {
    background-color: #eaeaea;
    font-weight: 600;
}

.tech-table tr:nth-child(even) {
    background-color: #f9f9f9;
}


/* === Courses Section === */
.courses {
    background: #f0f4ff;
    padding: 4rem 2rem;
}

.section-title {
    text-align: center;
    margin-bottom: 2rem;
}

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

@media (min-width: 1200px) {
    .course-list {
        grid-template-columns: repeat(3, 1fr); /* максимум 3 карточки в ряд */
    }
}

.card {
    background: var(--light);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    display: flex;
    flex-direction: column; /* чтобы можно было прижать кнопку вниз */
}

.card h4 {
    margin-bottom: 0.5rem;
}

.card p {
    flex-grow: 1; /* текст занимает всё доступное место */
}

.card a.btn {
    margin-top: auto; /* кнопка уходит в самый низ */
    display: inline-block; /* чтобы не растягивалась на всю ширину */
    align-self: flex-start; /* прижать к левому краю карточки */
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}


/* === Footer Section === */
footer {
    text-align: center;
    padding: 1rem;
    border-top: 1px solid #ddd;
    font-size: 0.9rem;
    background: var(--light);
}

/* === Fade-in animation === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === Responsive Styles === */
@media (max-width: 768px) {
    nav {
        display: none;
    }

    .burger {
        display: block;
    }
}