:root {
  --bg-start: #ffffff;
  --bg-end: #f4f6fb;
  --text-main: #0f172a;
  --text-muted: #4b5563;
  --accent: #4f46e5;
  --accent-2: #06b6d4;
  --surface: rgba(255, 255, 255, 0.78);
  --stroke: rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 30px rgba(2, 6, 23, 0.08);
  --shadow-hover: 0 14px 30px rgba(79, 70, 229, 0.2);
  --radius-lg: 22px;
  --radius-md: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-main);
  background: linear-gradient(160deg, var(--bg-start), var(--bg-end));
  line-height: 1.55;
}

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

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

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid transparent;
  transition: padding 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.site-header.scrolled {
  border-color: var(--stroke);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  align-items: center;
  padding: 1.15rem 0;
  transition: padding 0.35s ease;
}

.site-header.scrolled .header-inner {
  padding: 0.75rem 0;
}

.brand {
  font-size: clamp(1.7rem, 4vw, 2.45rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  width: fit-content;
  transition: transform 0.35s ease, color 0.25s ease;
}

.brand:hover {
  transform: scale(1.04);
  color: var(--accent);
}

.tagline {
  margin: 0;
  color: var(--text-muted);
  font-size: clamp(0.96rem, 2vw, 1.03rem);
}

.nav {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  padding: 0.2rem;
  background: rgba(255, 255, 255, 0.9);
}

.lang-btn {
  border: 0;
  background: transparent;
  padding: 0.32rem 0.65rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.78rem;
  color: #374151;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.lang-btn.active {
  background: #e0e7ff;
  color: #312e81;
}

.nav a {
  position: relative;
  font-weight: 600;
  color: #1f2937;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease;
}

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

.nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.section {
  padding: clamp(3.5rem, 7vw, 6.5rem) 0;
}

.about-grid {
  display: grid;
  gap: 2rem;
}

.about-avatar {
  width: min(330px, 62vw);
  margin: 0 auto;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 3px solid rgba(255, 255, 255, 0.8);
}

.about-avatar img {
  aspect-ratio: 1/1;
  object-fit: cover;
}

h1,
h2,
h3 {
  margin: 0 0 0.85rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h1, h2, h3 {
  font-family: "Montserrat", sans-serif;
  font-weight: 700; /* или 800 */
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 1.6rem;
}

.lead {
  font-size: clamp(1rem, 2.2vw, 1.13rem);
  color: #111827;
}

.about-content p {
  margin: 0 0 0.95rem;
  color: var(--text-muted);
}

.skills {
  margin-top: 1.2rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.personal-data {
  margin-top: 1.1rem;
  margin-bottom: 0.6rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.8);
}

.personal-data h3 {
  margin-bottom: 0.4rem;
  font-size: 1rem;
}

.personal-data p {
  margin: 0 0 0.25rem;
  font-size: 0.92rem;
}

.skill {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(79, 70, 229, 0.17);
  background: rgba(255, 255, 255, 0.85);
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.skill:hover {
  transform: scale(1.06);
  border-color: rgba(79, 70, 229, 0.45);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.18);
}

.project-grid {
  display: grid;
  gap: 1rem;
}

.project-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  background: var(--surface);
  backdrop-filter: blur(8px);
  padding: 0;
  box-shadow: var(--shadow-soft);
  transition: transform 0.28s ease, box-shadow 0.28s ease, background 0.28s ease, filter 0.28s ease;
}

.project-card:hover {
  transform: translateY(-7px) scale(1.01);
  box-shadow: var(--shadow-hover);
  background: rgba(255, 255, 255, 0.92);
  filter: brightness(0.98);
}

.project-media {
  position: relative;
  aspect-ratio: 16 / 9;
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease, filter 0.35s ease;
}

.project-card:hover .project-media img {
  transform: scale(1.05);
  filter: brightness(0.84);
}

.app-logo {
  position: absolute;
  right: 0.8rem;
  bottom: 0.8rem;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.8rem;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: #eef2ff;
  background: rgba(79, 70, 229, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.38);
  backdrop-filter: blur(8px);
}

.project-body {
  padding: 1.1rem 1.1rem 0.3rem;
}

.project-card h3 {
  font-size: clamp(1.25rem, 2.6vw, 1.52rem);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.15rem;
  transition: color 0.25s ease, text-decoration-color 0.25s ease;
}

.project-card:hover h3 {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.project-card p {
  color: var(--text-muted);
  margin-bottom: 0.8rem;
  transition: color 0.25s ease;
}

.project-card:hover p {
  color: #374151;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 0.9rem 1.1rem 1.1rem;
}

.project-meta {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  color: #334155;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
}

.stars {
  letter-spacing: 0.08rem;
  color: #f59e0b;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tech {
  font-size: 0.78rem;
  font-weight: 700;
  color: #4338ca;
  background: rgba(79, 70, 229, 0.12);
  border: 1px solid rgba(79, 70, 229, 0.24);
  padding: 0.24rem 0.55rem;
  border-radius: 999px;
}

.project-links a {
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 999px;
  padding: 0.38rem 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.project-links a:hover {
  transform: scale(1.08);
  color: var(--accent);
  border-color: rgba(79, 70, 229, 0.45);
}

.reviews-slider {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.8rem;
  align-items: center;
}

.slides {
  position: relative;
  min-height: 240px;
}

.review-card {
  position: absolute;
  inset: 0;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow-soft);
  padding: 1.4rem 1.2rem;
  opacity: 0;
  transform: translateY(14px) scale(0.98);
  transition: opacity 0.4s ease, transform 0.4s ease, box-shadow 0.25s ease;
  pointer-events: none;
}

.review-card.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.review-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px) scale(1.005);
}

.review-card p {
  margin: 0 0 1rem;
  color: #334155;
  font-size: 1rem;
}

.review-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.review-card span {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.slider-btn {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 999px;
  border: 1px solid rgba(79, 70, 229, 0.24);
  background: rgba(255, 255, 255, 0.88);
  color: var(--accent);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.slider-btn:hover {
  transform: scale(1.08);
  box-shadow: var(--shadow-soft);
  background: #eef2ff;
}

.contacts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-bottom: 1.3rem;
}

.contact-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.85);
  padding: 0.7rem 0.8rem;
  font-weight: 600;
  transition: transform 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.contact-item:hover {
  transform: scale(1.02) translateY(-2px);
  color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.contact-icon {
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  display: grid;
  place-content: center;
  background: rgba(79, 70, 229, 0.1);
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 700;
}

.contact-item::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%) translateY(6px);
  opacity: 0;
  pointer-events: none;
  background: #111827;
  color: #f9fafb;
  font-size: 0.74rem;
  white-space: nowrap;
  padding: 0.28rem 0.46rem;
  border-radius: 0.45rem;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.contact-item:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.contact-btn {
  display: inline-block;
  border-radius: 999px;
  padding: 0.72rem 1.2rem;
  font-weight: 700;
  color: #f8fafc;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
}

.contact-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 24px rgba(79, 70, 229, 0.36);
  filter: saturate(1.15);
}

.site-footer {
  padding: 1.3rem 0;
  text-align: center;
  color: #d1d5db;
  background: rgba(15, 23, 42, 0.93);
  font-size: 0.86rem;
}

.site-footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.from-left {
  transform: translateX(-26px);
}

.from-bottom {
  transform: translateY(26px);
}

.delay-1 {
  transition-delay: 0.08s;
}

.delay-2 {
  transition-delay: 0.16s;
}

.delay-3 {
  transition-delay: 0.24s;
}

.reveal.is-visible {
  opacity: 1;
  transform: translate(0, 0);
}

@media (min-width: 700px) {
  .header-inner {
    grid-template-columns: 1fr auto auto;
    gap: 1rem;
  }

  .tagline {
    grid-column: 1 / -1;
    text-align: left;
  }

  .about-grid {
    grid-template-columns: 0.95fr 1.25fr;
    align-items: center;
    gap: 2.5rem;
  }

  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .project-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .header-inner {
    grid-template-columns: 1fr;
  }

  .lang-switch {
    width: fit-content;
  }

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

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

  .project-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .reviews-slider {
    grid-template-columns: 1fr;
  }

  .slides {
    min-height: 280px;
  }

  .slider-btn {
    justify-self: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}