/* ==========================================================================
   Tetiana Reveko — One-page portfolio
   ========================================================================== */

:root {
  --bg: #0a0e12;
  --bg-alt: #0e1319;
  --surface: #131920;
  --surface-2: #171e26;
  --text: #f3f5f7;
  --text-muted: #9aa5b1;
  --accent: #2dd4bf;
  --accent-2: #7c5cff;
  --accent-grad: linear-gradient(135deg, #2dd4bf 0%, #7c5cff 100%);
  --border: rgba(255,255,255,0.09);
  --radius: 20px;
  --font-head: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
  --container: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h2 { font-size: clamp(1.9rem, 3.6vw, 3rem); margin: 14px 0 18px; max-width: 780px; }
h3 { font-size: 1.25rem; margin-bottom: 10px; }
h4 { font-size: 1.05rem; margin-bottom: 2px; }

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

.section-tag {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 7px 16px;
  border-radius: 999px;
}

.section-lead { max-width: 620px; margin-bottom: 50px; font-size: 1.05rem; }

.section { padding: 120px 0; position: relative; }
.section-alt { background: var(--bg-alt); }

.text-accent {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Noise + glow */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.cursor-glow {
  position: fixed;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45,212,191,0.14), transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 0;
  transition: opacity 0.3s;
}

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(10,14,18,0.55);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  background: rgba(10,14,18,0.88);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}
.logo {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.nav { display: flex; align-items: center; gap: 30px; }
.nav a {
  font-size: 0.93rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav a:hover { color: var(--text); }
.nav-cta {
  color: #06111a !important;
  background: var(--accent-grad);
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-cta:hover { opacity: 0.9; }

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 60;
}
.burger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 78px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 25%, rgba(45,212,191,0.22), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(124,92,255,0.22), transparent 45%);
}
.hero-inner { position: relative; z-index: 1; max-width: 820px; }
.eyebrow {
  color: var(--accent);
  font-family: var(--font-head);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  margin-bottom: 26px;
}
.hero-lead {
  font-size: 1.15rem;
  max-width: 600px;
  margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 56px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 40px;
}
.hero-stats > div { display: flex; flex-direction: column; gap: 4px; }
.stat-num {
  font-family: var(--font-head);
  font-size: 1.7rem;
  font-weight: 700;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label { font-size: 0.82rem; color: var(--text-muted); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 30px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s, opacity 0.2s, box-shadow 0.2s;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--accent-grad);
  color: #06111a;
  box-shadow: 0 10px 30px -8px rgba(45,212,191,0.4);
}
.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-large { padding: 18px 38px; font-size: 1.05rem; margin-top: 10px; }

/* Marquee */
.marquee {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  padding: 24px 0;
  background: var(--bg-alt);
  position: relative;
  z-index: 1;
}
.marquee-track {
  display: flex;
  gap: 52px;
  white-space: nowrap;
  animation: scroll 32s linear infinite;
  width: max-content;
}
.marquee-track span {
  font-family: var(--font-head);
  font-size: 1rem;
  letter-spacing: 0.09em;
  color: var(--text-muted);
}
@keyframes scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.25s, border-color 0.25s, background 0.25s;
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  background: var(--surface-2);
}
.service-icon { font-size: 1.8rem; display: block; margin-bottom: 16px; }
.service-card p { font-size: 0.94rem; }

/* Work grid */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.work-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s, border-color 0.25s;
}
.work-card:hover { transform: translateY(-6px); border-color: var(--accent); }
.work-thumb {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-grad);
  position: relative;
  overflow: hidden;
}
.work-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.25), transparent 60%);
}
.work-thumb span {
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 700;
  color: rgba(6,17,26,0.85);
  position: relative;
  z-index: 1;
}
.work-card h3 { padding: 20px 22px 2px; font-size: 1.1rem; }
.work-tag {
  padding: 0 22px 20px;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.testimonial-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
}
.testimonial-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-grad);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.85rem;
  color: #06111a;
  flex-shrink: 0;
}
.testimonial-role { font-size: 0.8rem; color: var(--text-muted); }
.testimonial-text {
  font-size: 0.92rem;
  font-style: italic;
  margin-bottom: 16px;
  flex-grow: 1;
}
.testimonial-date { font-size: 0.78rem; color: var(--accent); }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: start;
}
.about-text p { margin-bottom: 18px; font-size: 1rem; }
.about-text strong { color: var(--text); }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stat-card-num {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}
.stat-card-label { font-size: 0.86rem; color: var(--text-muted); }

/* Process */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.process-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
  position: relative;
}
.process-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent-grad);
  color: #06111a;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 16px;
}
.process-card p { font-size: 0.9rem; }

/* CTA */
.cta-section {
  text-align: center;
}
.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 70px 40px;
}
.cta-lead { max-width: 540px; margin: 18px auto 8px; }
.social-links {
  display: flex;
  gap: 26px;
  margin-top: 30px;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.social-links a { transition: color 0.2s; }
.social-links a:hover { color: var(--accent); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 60px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 { margin-bottom: 14px; font-size: 1rem; }
.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent); }
.footer-sub { font-size: 0.85rem; margin-top: 8px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

/* Reveal animation */
[data-aos] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
[data-aos].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1000px) {
  .services-grid, .work-grid, .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, auto); gap: 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 720px) {
  .nav {
    position: fixed;
    top: 78px;
    right: 0;
    height: calc(100vh - 78px);
    width: 78%;
    max-width: 320px;
    background: var(--bg-alt);
    border-left: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 40px 28px;
    gap: 26px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .nav.open { transform: translateX(0); }
  .burger { display: flex; }
  .services-grid, .work-grid, .testimonials-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .section { padding: 84px 0; }
  .cursor-glow { display: none; }
  .cta-inner { padding: 50px 24px; }
}

@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
}