/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #121212;
    --color-bg-tertiary: #1a1a1a;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-accent: #00f3ff;
    --color-accent-hover: #00d9e6;
    --color-border: #2a2a2a;
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --transition: all 0.3s ease;
    --container-width: 1200px;
    --header-height: 70px;

    /* Fluid typography - автоматическая подстройка шрифтов */
    --font-size-base: clamp(0.9rem, 2vw, 1rem);
    --font-size-h1: clamp(1.8rem, 5vw, 3.5rem);
    --font-size-h2: clamp(1.5rem, 4vw, 2.5rem);
    --font-size-h3: clamp(1.2rem, 3vw, 1.4rem);
    --font-size-h4: clamp(1rem, 2.5vw, 1.2rem);

    /* Fluid spacing */
    --section-padding: clamp(40px, 8vw, 100px);
    --container-padding: clamp(15px, 3vw, 20px);
}

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

/* Allow selection for contact links */
.contact-link {
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
    user-select: none !important;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: 1.6;
    overflow-x: hidden;
    overflow-wrap: break-word;
    word-wrap: break-word;
    hyphens: auto;
}

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

ul {
    list-style: none;
}

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

/* Support for iPhone notch and home indicator */
@supports (padding: max(0px)) {
    body {
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }

    .header {
        padding-top: env(safe-area-inset-top);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }

    .footer {
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }
}

/* ========================================
   Utilities
   ======================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

.section {
    padding: var(--section-padding) 0;
    width: 100%;
}

.section__title {
    font-size: var(--font-size-h2);
    text-align: center;
    margin-bottom: clamp(30px, 6vw, 60px);
    font-weight: 700;
}

.section__title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    margin: 20px auto 0;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background-color: var(--color-accent);
    color: var(--color-bg);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.btn:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 243, 255, 0.3);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.header__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.logo-text {
    font-family: 'Consolas', 'Monaco', monospace;
}

.header__nav {
    display: flex;
}

.nav__list {
    display: flex;
    gap: 30px;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

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

.nav__link:hover::after {
    width: 100%;
}

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

.nav__link.active::after {
    width: 100%;
}

.header__btn {
    padding: 10px 24px;
    font-size: 0.9rem;
}

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

.burger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition);
}

/* ========================================
   Mobile Menu
   ======================================== */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg-secondary);
    z-index: 999;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu.active {
    left: 0;
}

.mobile-menu__list {
    text-align: center;
}

.mobile-menu__list li {
    margin: 30px 0;
}

.mobile-menu__link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
}

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

.mobile-menu__link.active {
    color: var(--color-accent);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero__canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.25;
    pointer-events: none;
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    width: 90%;
    padding: 0 15px;
}

.hero__title {
    font-size: var(--font-size-h1);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: clamp(15px, 3vw, 20px);
    background: linear-gradient(135deg, var(--color-text), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    word-break: break-word;
}

.hero__subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: clamp(25px, 5vw, 40px);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero__btn {
    padding: clamp(14px, 3vw, 16px) clamp(25px, 5vw, 40px);
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.hero__note {
    margin-top: clamp(20px, 4vw, 30px);
    font-size: clamp(0.75rem, 2vw, 0.85rem);
    color: var(--color-text-muted);
    font-style: italic;
}

/* ========================================
   About Section
   ======================================== */
.about {
    background-color: var(--color-bg-secondary);
}

.about__container {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    align-items: center;
}

.about__text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

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

.code-icon svg {
    width: 100%;
    max-width: 300px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ========================================
   Services Section
   ======================================== */
.services {
    background-color: var(--color-bg);
}

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

.service-card {
    background-color: var(--color-bg-secondary);
    padding: 40px 30px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.service-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.15);
    transform: translateY(-5px);
}

.service-card__icon {
    margin-bottom: 25px;
}

.service-card__icon svg {
    width: 50px;
    height: 50px;
}

.service-card__title {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--color-text);
}

.service-card__list {
    color: var(--color-text-muted);
}

.service-card__list li {
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.service-card__list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ========================================
   Portfolio Section
   ======================================== */
.portfolio {
    background-color: var(--color-bg-secondary);
}

.portfolio__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.portfolio-card {
    background-color: var(--color-bg-tertiary);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.portfolio-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
}

.portfolio-card__image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background-color: var(--color-bg-secondary);
}

.portfolio-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
}

.portfolio-card:hover .portfolio-card__image img {
    transform: scale(1.05);
}

.portfolio-card__placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.portfolio-card__content {
    padding: 30px;
}

.portfolio-card__title {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.portfolio-card__site {
    margin-bottom: 15px;
}

.portfolio-card__site a {
    color: var(--color-accent);
    font-size: 0.9rem;
}

.portfolio-card__site a:hover {
    text-decoration: underline;
}

.portfolio-card__desc {
    color: var(--color-text-muted);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.portfolio-card__link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--color-text);
    font-weight: 600;
}

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

.portfolio-card__link span {
    transition: var(--transition);
}

.portfolio-card__link:hover span {
    transform: translateX(5px);
}

/* ========================================
   Stack Section
   ======================================== */
.stack {
    background-color: var(--color-bg);
}

.stack__cloud {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    max-width: 900px;
    margin: 0 auto;
}

.stack__tag {
    padding: 12px 24px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 30px;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    transition: var(--transition);
}

.stack__tag:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-3px);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background-color: var(--color-bg-secondary);
}

.contact__content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact__text {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.contact__item {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact__item svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

/* Contact links */
.contact-link {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.contact-link::after {
    content: ' 👁';
    font-size: 0.8em;
    opacity: 0.7;
}

.contact-link:hover {
    text-decoration: underline;
}

.contact-link:hover::after {
    opacity: 1;
}

/* Desktop/Mobile visibility - по умолчанию показываем desktop */
.contact__item {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Скрываем mobile-only на desktop */
.contact__item.mobile-only {
    display: none !important;
}

/* Mobile styles */
@media (max-width: 767px) {
    /* Скрываем desktop-only на мобильных */
    .contact__item.desktop-only {
        display: none !important;
    }

    /* Показываем mobile-only на мобильных */
    .contact__item.mobile-only {
        display: flex !important;
        align-items: center;
        gap: 15px;
    }

    .mobile-only .contact-link {
        color: var(--color-accent);
        text-decoration: none;
        cursor: default;
    }

    .mobile-only .contact-link:hover {
        text-decoration: underline;
    }

    .mobile-only .contact-link::after {
        content: '' !important;
    }
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--color-bg);
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
}

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

.footer__text {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer__link {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

/* ========================================
   Responsive Design - Fluid Breakpoints
   ======================================== */

/* Large tablets and small desktops */
@media (max-width: 1199px) {
    .container {
        max-width: 960px;
    }

    .hero__content {
        max-width: 800px;
    }
}

/* Medium tablets */
@media (max-width: 991px) {
    .container {
        max-width: 720px;
    }

    .about__container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about__visual {
        order: -1;
    }

    .contact__container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Small tablets */
@media (max-width: 767px) {
    :root {
        --header-height: 60px;
    }

    .section {
        padding: 60px 0;
    }

    .section__title {
        font-size: var(--font-size-h2);
        margin-bottom: 40px;
    }

    .header__nav,
    .header__btn {
        display: none;
    }

    .header__burger {
        display: flex;
    }

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

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

    .header__burger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero__title {
        font-size: var(--font-size-h1);
    }

    .hero__subtitle {
        font-size: clamp(0.95rem, 2.5vw, 1rem);
    }

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

    .portfolio-card__image {
        height: 180px;
    }

    .footer__container {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .contact__content {
        max-width: 100%;
    }
}

/* Large phones */
@media (max-width: 575px) {
    .container {
        max-width: 100%;
    }

    .hero__content {
        width: 95%;
    }

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

    .about__container {
        gap: 30px;
    }

    .contact__details {
        gap: 15px;
    }
}

/* Small phones */
@media (max-width: 399px) {
    .hero__title {
        font-size: clamp(1.5rem, 6vw, 1.8rem);
    }

    .section__title {
        font-size: clamp(1.3rem, 5vw, 1.5rem);
    }

    .stack__cloud {
        gap: 8px;
    }

    .stack__tag {
        padding: 8px 14px;
        font-size: clamp(0.75rem, 2.5vw, 0.85rem);
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
}

/* Very small phones */
@media (max-width: 319px) {
    .hero__title {
        font-size: 1.4rem;
    }

    .hero__subtitle {
        font-size: 0.85rem;
    }
}

/* Landscape orientation on mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }

    .hero__title {
        font-size: clamp(1.5rem, 4vw, 2rem);
    }

    .hero__subtitle {
        font-size: clamp(0.9rem, 2vw, 1rem);
        margin-bottom: 20px;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero__content {
    animation: fadeIn 1s ease;
}

.service-card,
.portfolio-card {
    animation: fadeIn 0.6s ease backwards;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }
.service-card:nth-child(4) { animation-delay: 0.4s; }

.portfolio-card:nth-child(1) { animation-delay: 0.1s; }
.portfolio-card:nth-child(2) { animation-delay: 0.2s; }
.portfolio-card:nth-child(3) { animation-delay: 0.3s; }