/* ========================================
   Portfolio Unity Developer — Main Styles
   ======================================== */

/* ----- CSS Variables ----- */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #1a1a24;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1, #4facfe);
    --border: #2a2a3a;
    --font-main: 'Inter', sans-serif;
    --font-code: 'JetBrains Mono', monospace;
    --max-width: 1200px;
    --radius: 12px;
    --transition: 0.3s ease;
}

/* ----- Light Theme ----- */
[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
}

/* ----- Global Transitions for Theme ----- */
*,
*::before,
*::after {
    transition: background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

/* ----- Reset & Base ----- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    position: relative;
}

/* ----- Developer-Style Background Grid (IDE-like) ----- */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 20%, transparent 70%);
}

/* Второй слой — тонкие линии для глубины (как в IDE) */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 39px,
            rgba(99, 102, 241, 0.03) 39px,
            rgba(99, 102, 241, 0.03) 40px
        );
    mask-image: radial-gradient(ellipse 60% 60% at 50% 30%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 30%, black 20%, transparent 70%);
}

/* ----- Selection ----- */
::selection {
    background: var(--accent);
    color: #fff;
}

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

a:hover {
    color: var(--accent-hover);
}

ul, ol {
    list-style: none;
}

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

code {
    font-family: var(--font-code);
}

/* ----- Scroll Animations (JS-управляемые) ----- */
.animate-on-scroll {
    opacity: 0;
    will-change: transform, opacity;
}

/* Default: fadeInUp */
.animate-on-scroll[data-animation="fadeInUp"],
.animate-on-scroll:not([data-animation]) {
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll[data-animation="fadeInLeft"] {
    transform: translateX(-40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll[data-animation="fadeInRight"] {
    transform: translateX(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll[data-animation="zoomIn"] {
    transform: scale(0.8);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1 !important;
    transform: translateY(0) translateX(0) scale(1) !important;
}

/* ----- @keyframes for fallback / non-JS ----- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInLeft {
    from { opacity: 0; transform: translateX(-40px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(40px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.8); }
    to   { opacity: 1; transform: scale(1); }
}

/* ----- Sections ----- */
.section {
    padding: 64px 20px;
}

/* ----- Container ----- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ----- Section Title / Subtitle ----- */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    border-radius: 2px;
    background: var(--accent-gradient);
    margin: 12px auto 0;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ----- Gradient Text ----- */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ----- Buttons ----- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    border-color: transparent;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

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

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

/* ----- Header / Navigation ----- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

/* Header hidden on scroll down */
.header.header--hidden {
    transform: translateY(-100%);
}

/* Header shadow on scroll */
.header.header--scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    background: rgba(10, 10, 15, 0.95);
}

[data-theme="light"] .header.header--scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

.nav__list {
    display: flex;
    gap: 32px;
}

.nav__link {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition);
}

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

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

.header__actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ----- Theme Toggle ----- */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
    line-height: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
}

.theme-toggle:hover {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.08);
    transform: scale(1.05);
}

/* ----- Nav Toggle (Burger) ----- */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ----- Hero Section ----- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
    overflow: hidden;
}

/* Фоновый эффект: сетка + градиент */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at center, black 30%, transparent 70%);
    pointer-events: none;
}

/* Дополнительный радиальный градиент для глубины */
.hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.hero__inner {
    position: relative;
    z-index: 1;
}

.hero__greeting {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.hero__name {
    font-weight: 700;
    color: var(--text-primary);
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.15;
    letter-spacing: -0.5px;
}

.hero__subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ----- Hero Анимации (fadeInUp с задержками) ----- */
.hero__greeting.animate-on-scroll {
    animation: heroFadeInUp 0.7s ease forwards;
}

.hero__title.animate-on-scroll {
    animation: heroFadeInUp 0.7s ease 0.15s forwards;
    opacity: 0;
}

.hero__subtitle.animate-on-scroll {
    animation: heroFadeInUp 0.7s ease 0.3s forwards;
    opacity: 0;
}

.hero__actions.animate-on-scroll {
    animation: heroFadeInUp 0.7s ease 0.45s forwards;
    opacity: 0;
}

@keyframes heroFadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ----- About Section ----- */
.about {
    position: relative;
}

.about__content {
    max-width: 1000px;
    margin: 0 auto;
}

/* Две колонки: фото + текст */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: start;
}

/* Фото — контейнер */
.about__photo-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    border-radius: 50%;
    overflow: hidden;
    width: 320px;
    height: 320px;
    box-shadow:
        0 0 0 4px var(--bg-primary),
        0 0 0 6px var(--accent),
        0 20px 60px rgba(99, 102, 241, 0.2);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    /* Начальная маска — градиентное размытие сверху */
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 40%);
    mask-image: linear-gradient(to bottom, transparent 0%, black 40%);
    -webkit-mask-size: 100% 100%;
    mask-size: 100% 100%;
    transition: mask-image 0.8s ease, -webkit-mask-image 0.8s ease;
}

.about__photo-wrapper:hover {
    transform: scale(1.03);
    box-shadow:
        0 0 0 4px var(--bg-primary),
        0 0 0 6px var(--accent-hover),
        0 24px 72px rgba(99, 102, 241, 0.35);
}

/* При появлении секции — эффект затухания фото при скролле */
.about__photo-wrapper.visible {
    -webkit-mask-image: linear-gradient(to bottom, black 70%, transparent 100%);
    mask-image: linear-gradient(to bottom, black 70%, transparent 100%);
}

/* Само фото */
.about__photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

/* Псевдоэлемент с градиентным blur-эффектом */
.about__photo-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(99, 102, 241, 0.15) 20%,
        transparent 40%
    );
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.8s ease;
}

.about__photo-wrapper.visible::after {
    opacity: 0;
}

/* Текст описания */
.about__info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.about__text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* Блок с ключевыми цифрами */
.about__stats {
    display: flex;
    gap: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.stat-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 28px 16px;
    text-align: center;
    position: relative;
    gap: 8px;
}

/* Разделители между карточками */
.stat-card + .stat-card {
    border-left: 1px solid var(--border);
}

.stat-card__number {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1;
}

.stat-card__label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 110px;
    line-height: 1.4;
}

/* ========================================
   Skills Section
   ======================================== */
.skills__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: border-color var(--transition), transform var(--transition);
}

.skill-category:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.skill-category__header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.skill-category__icon {
    font-size: 1.75rem;
    line-height: 1;
}

.skill-category__title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

.skill-category__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    transition: all var(--transition);
    line-height: 1.4;
}

.skill-tag:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.08);
}

/* ========================================
   Projects Section
   ======================================== */

/* --- Filters --- */
.projects__filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent);
}

.filter-btn.active {
    color: #fff;
    background: var(--accent-gradient);
    border-color: transparent;
}

/* --- Grid --- */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

/* --- Project Card --- */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
    border-color: var(--accent);
}

/* Placeholder for future screenshots/videos */
.project-card__placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 180px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.project-card__placeholder-icon {
    font-size: 3rem;
    opacity: 0.5;
    transition: opacity var(--transition), transform var(--transition);
}

.project-card:hover .project-card__placeholder-icon {
    opacity: 0.8;
    transform: scale(1.1);
}

.project-card__body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
}

.project-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-card__tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 12px;
    line-height: 1.4;
}

.project-card__tag--category {
    color: #fff;
    background: var(--accent-gradient);
}

.project-card__tag--platform {
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
}

.project-card__title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.project-card__description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
}

.project-card__stack {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-card__stack-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent);
    background: rgba(99, 102, 241, 0.1);
    border-radius: 8px;
    line-height: 1.4;
    transition: background var(--transition);
}

.project-card__stack-tag:hover {
    background: rgba(99, 102, 241, 0.2);
}

.project-card__link {
    align-self: flex-start;
    margin-top: 4px;
}

/* ========================================
   Code Section — Code Panels
   ======================================== */

/* --- Code Panels --- */
.code__panel {
    display: none;
}

.code__panel.active {
    display: block;
}

.code__examples pre {
    margin: 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.code__examples pre code.hljs {
    background: var(--bg-card) !important;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 24px !important;
    font-family: var(--font-code) !important;
    font-size: 0.88rem;
    line-height: 1.7;
    overflow-x: auto;
}

/* Кастомный скролл для блоков кода */
.code__examples pre code.hljs::-webkit-scrollbar {
    height: 6px;
}

.code__examples pre code.hljs::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 0 0 var(--radius) var(--radius);
}

.code__examples pre code.hljs::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.code__examples pre code.hljs::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ========================================
   Code Section — Architecture Diagram
   ======================================== */

.code__diagram {
    margin-top: 60px;
    text-align: center;
}

.code__diagram-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.code__diagram-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* Architecture Diagram — Layers from bottom (domain) to top (bootstrap) */
.arch-diagram {
    display: flex;
    flex-direction: column-reverse;
    gap: 6px;
    max-width: 800px;
    margin: 0 auto;
}

.arch-layer {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: border-color var(--transition), transform var(--transition);
    cursor: default;
}

.arch-layer:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.arch-layer__label {
    flex-shrink: 0;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    min-width: 110px;
    text-align: right;
    padding-right: 12px;
    border-right: 2px solid var(--border);
}

.arch-layer__items {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.arch-item {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all var(--transition);
    line-height: 1.4;
}

.arch-item--clickable {
    cursor: pointer;
}

.arch-item--clickable:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.08);
}

/* Layer colors */
.arch-layer--domain .arch-item {
    border-color: rgba(99, 102, 241, 0.3);
}

.arch-layer--application .arch-item {
    border-color: rgba(79, 172, 254, 0.3);
}

.arch-layer--infrastructure .arch-item {
    border-color: rgba(52, 211, 153, 0.3);
}

.arch-layer--presentation .arch-item {
    border-color: rgba(251, 191, 36, 0.3);
}

.arch-layer--input .arch-item {
    border-color: rgba(248, 113, 113, 0.3);
}

.arch-layer--bootstrap .arch-item {
    border-color: rgba(196, 114, 255, 0.3);
}

/* ========================================
   Video Section
   ======================================== */

.video__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video__card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition), transform var(--transition);
}

.video__card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.video__embed {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 0 0 var(--radius) var(--radius);
    background: #000;
}

.video__embed iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}

.video__title {
    font-size: 1rem;
    font-weight: 600;
    padding: 16px;
    color: var(--text-primary);
    text-align: center;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.video__player {
    width: 100%;
    max-width: 100%;
    display: block;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: #000;
    border-radius: 0 0 var(--radius) var(--radius);
}

/* Placeholder styling for video cards while Rutube uploads */
.video__placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: linear-gradient(135deg, rgba(10, 10, 15, 0.9), rgba(26, 26, 36, 0.9));
    border-radius: 0 0 var(--radius) var(--radius);
    color: var(--text-secondary);
}

.video__placeholder-icon {
    font-size: 3rem;
    line-height: 1;
    opacity: 0.7;
}

.video__placeholder-text {
    font-size: 0.85rem;
    opacity: 0.6;
    text-align: center;
    padding: 0 16px;
}

/* Отступ между код-табами и архитектурной диаграммой */
.code__examples {
    margin-bottom: 2rem;
}

/* ========================================
   Print Styles (для window.print)
   ======================================== */
@media print {
    /* Скрываем навигацию, видео, код, скролл-топ */
    .header,
    .video,
    #video,
    #code,
    .code-section,
    .scroll-top,
    .nav-toggle,
    .theme-toggle {
        display: none !important;
    }

    /* Обнуляем фоны, делаем чёрный текст на белом */
    * {
        background: transparent !important;
        background-color: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
        border-color: #ccc !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
        font-size: 12pt;
        line-height: 1.5;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .section {
        padding: 24px 0 !important;
        page-break-inside: avoid;
    }

    .section-title::after {
        background: #000 !important;
    }

    .gradient-text {
        -webkit-text-fill-color: #000 !important;
        color: #000 !important;
    }

    .about__photo-wrapper {
        width: 180px !important;
        height: 180px !important;
        -webkit-mask-image: none !important;
        mask-image: none !important;
        box-shadow: 0 0 0 2px #000 !important;
    }

    .about__photo-wrapper::after {
        display: none !important;
    }

    .skill-category,
    .project-card,
    .timeline__card,
    .contact__item,
    .stat-card {
        border: 1px solid #ccc !important;
        page-break-inside: avoid;
    }

    .footer {
        display: none !important;
    }

    a {
        color: #000 !important;
        text-decoration: underline !important;
    }

    .btn {
        border: 1px solid #000 !important;
        padding: 6px 16px !important;
    }
}

/* ========================================
   Experience Section — Timeline
   ======================================== */

.experience__timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

/* Вертикальная линия */
.experience__timeline::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-gradient);
    border-radius: 1px;
}

/* Элемент таймлайна */
.timeline__item {
    position: relative;
    margin-bottom: 40px;
}

.timeline__item:last-child {
    margin-bottom: 0;
}

/* Точка-маркер */
.timeline__marker {
    position: absolute;
    left: -40px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 2px var(--accent), 0 4px 12px rgba(99, 102, 241, 0.3);
    z-index: 1;
}

/* Карточка опыта */
.timeline__card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: border-color var(--transition), transform var(--transition);
}

.timeline__card:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.timeline__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.timeline__period {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 12px;
}

.timeline__description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.timeline__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline__tags .skill-tag {
    font-size: 0.8rem;
    padding: 4px 12px;
}

/* Stagger-анимация для элементов таймлайна */
.timeline__item.animate-on-scroll {
    transition-delay: calc(var(--stagger-index, 0) * 150ms);
}

.timeline__item.visible .timeline__marker {
    animation: zoomIn 0.4s ease forwards;
}

/* ========================================
   Contact Section
   ======================================== */

.contact__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    max-width: 600px;
    margin: 0 auto;
    align-items: start;
}

/* --- Контактная информация --- */
.contact__info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact__item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition), transform var(--transition);
}

.contact__item:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.contact__icon {
    font-size: 1.3rem;
    line-height: 1;
    flex-shrink: 0;
}

.contact__link {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition);
    word-break: break-all;
}

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

/* ----- Footer ----- */
.footer {
    border-top: 1px solid var(--border);
    padding: 16px 20px;
    text-align: center;
}

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

/* ========================================
   Scroll-to-Top Button
   ======================================== */
.scroll-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 999;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.scroll-top svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   Highlight.js — Custom Dark Theme Overrides
   ======================================== */
pre code.hljs {
    background: var(--bg-card) !important;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 20px !important;
    font-family: var(--font-code) !important;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ========================================
   Scrollbar Styles
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ========================================
   Responsive
   ======================================== */

/* --- 1200px+ (4K / Large Screens) --- */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }

    .hero__title {
        font-size: clamp(3.5rem, 5vw, 5rem);
    }

    .section-title {
        font-size: 3rem;
    }

    .about__grid {
        gap: 80px;
    }

    .skills__grid {
        gap: 28px;
    }

    .projects__grid {
        gap: 28px;
    }
}

/* --- 768px (Tablets) --- */
@media (max-width: 768px) {
    .section {
        padding: 40px 16px;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero__title {
        font-size: 2.2rem;
    }

    .hero__subtitle {
        font-size: 1rem;
    }

    /* About: две колонки в одну на мобильных */
    .about__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about__photo-wrapper {
        width: 200px;
        height: 200px;
        margin: 0 auto;
    }

    .about__stats {
        flex-direction: column;
    }

    .stat-card + .stat-card {
        border-left: none;
        border-top: 1px solid var(--border);
    }

    .stat-card {
        padding: 22px 16px;
    }

    .nav__list {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        gap: 0;
        padding: 16px 0;
        border-bottom: 1px solid var(--border);
    }

    .nav__list.active {
        display: flex;
    }

    .nav__link {
        display: block;
        padding: 12px 24px;
    }

    .nav-toggle {
        display: flex;
    }

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

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

    .project-card__placeholder {
        height: 150px;
    }

    /* Experience — responsive */
    .experience__timeline {
        padding-left: 32px;
    }

    .experience__timeline::before {
        left: 15px;
    }

    .timeline__marker {
        left: -32px;
        width: 10px;
        height: 10px;
    }

    .timeline__card {
        padding: 18px;
    }

    /* Contact — responsive */
    .contact__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .contact__form-wrapper {
        padding: 20px;
    }

    /* Theme toggle on mobile */
    .header__actions {
        gap: 6px;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .scroll-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }

    .scroll-top svg {
        width: 18px;
        height: 18px;
    }

    /* Video — responsive */
    .video__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

/* --- 540px (Small tablets / large phones) --- */
@media (max-width: 540px) {
    .skills__grid {
        grid-template-columns: 1fr;
    }

    .projects__filters {
        gap: 8px;
    }

    .filter-btn {
        padding: 8px 18px;
        font-size: 0.88rem;
    }

    .project-card__placeholder {
        height: 130px;
    }

    .project-card__body {
        padding: 18px;
    }

    /* Video — single column */
    .video__grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 32px 12px;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
        margin-bottom: 32px;
    }

    .hero__title {
        font-size: clamp(1.8rem, 10vw, 2.2rem);
    }

    .hero__subtitle {
        font-size: 0.95rem;
    }

    .hero__greeting {
        font-size: 1.1rem;
    }

    .about__text {
        font-size: 0.95rem;
    }

    .about__photo-wrapper {
        width: 160px;
        height: 160px;
    }

    /* Architecture diagram responsive */
    .arch-layer {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 10px 12px;
    }

    .arch-layer__label {
        text-align: left;
        min-width: unset;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding-right: 0;
        padding-bottom: 6px;
    }

    .stat-card__number {
        font-size: 1.8rem;
    }

    /* Skills: 1 колонка */
    .skills__grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .skill-category {
        padding: 20px 16px;
    }

    .skill-category__title {
        font-size: 1rem;
    }

    /* Projects */
    .projects__grid {
        gap: 16px;
    }

    .project-card__body {
        padding: 16px;
    }

    .project-card__placeholder {
        height: 120px;
    }

    /* Timeline */
    .experience__timeline {
        padding-left: 28px;
    }

    .timeline__marker {
        left: -28px;
        width: 8px;
        height: 8px;
    }

    .timeline__card {
        padding: 14px;
    }

    .timeline__title {
        font-size: 1rem;
    }

    .timeline__description {
        font-size: 0.88rem;
    }

    /* Contact */
    .contact__grid {
        gap: 24px;
    }

    .contact__item {
        padding: 12px 14px;
    }

    .contact__link {
        font-size: 0.88rem;
    }

    .contact__form-wrapper {
        padding: 16px;
    }

    /* Scroll top */
    .scroll-top {
        bottom: 16px;
        right: 16px;
        width: 40px;
        height: 40px;
    }

    .scroll-top svg {
        width: 16px;
        height: 16px;
    }

    /* Hero actions */
    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 240px;
        padding: 10px 24px;
    }
}