/* ============================================================
   KATERYNA YAKYMENKO — Portfolio
   Design: Dark #141616, Accent #FF640A, Cream #FDFFEC
   Font: Inter (Google)
   ============================================================ */

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

:root {
  --bg:        #141616;
  --bg-card:   #1C1E1E;
  --bg-card2:  #222424;
  --accent:    #FF640A;
  --accent-dim: rgba(255,100,10,0.12);
  --accent-glow: rgba(255,100,10,0.25);
  --cream:     #FDFFEC;
  --body:      #9A9A9A;
  --muted:     #5A5A5A;
  --border:    rgba(255,255,255,0.07);
  --radius:    12px;
  --radius-lg: 20px;
  --font:      'Inter', sans-serif;
  --max-w:     1160px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

/* --- Scroll animations ------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.16,1,0.3,1), transform 0.65s cubic-bezier(0.16,1,0.3,1);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Utility ---------------------------------------------- */
.accent { color: var(--accent); }
.cream  { color: var(--cream); }

section { padding: 96px 0; }
section + section { border-top: 1px solid var(--border); }

.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--cream);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 17px;
  color: var(--body);
  max-width: 600px;
  margin-bottom: 56px;
}

/* --- Navigation ------------------------------------------- */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(20,22,22,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  padding: 8px 14px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--cream); background: rgba(255,255,255,0.05); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #e05500; transform: translateY(-1px); box-shadow: 0 6px 24px var(--accent-glow); }

.btn-outline {
  background: transparent;
  color: var(--cream);
  border: 1.5px solid rgba(255,255,255,0.2);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--cream);
  border-radius: 2px;
  transition: all 0.3s;
}

/* --- Hero ------------------------------------------------- */
#hero {
  padding: 160px 0 96px;
  border-top: none;
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: '';
  position: absolute;
  top: -180px;
  left: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(255,100,10,0.13) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

#hero::after {
  content: '';
  position: absolute;
  top: 60px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,100,10,0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

#hero > .container { position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(255,100,10,0.25);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 68px);
  font-weight: 800;
  color: var(--cream);
  line-height: 1.1;
  letter-spacing: -0.03em;
  max-width: 820px;
  margin-bottom: 24px;
}
.hero-title em { font-style: normal; color: var(--accent); }

.hero-sub {
  font-size: 18px;
  color: var(--body);
  max-width: 600px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--body);
}
.stat-pill strong { color: var(--cream); font-weight: 700; }

/* --- Social Proof ----------------------------------------- */
#social-proof {
  padding: 48px 0;
}

.proof-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.proof-label {
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.proof-logos {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.proof-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--cream);
  transition: border-color var(--transition);
}
.proof-badge:hover { border-color: var(--accent); }

.upwork-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid rgba(20,153,0,0.3);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 700;
  color: #6FCF60;
}

/* --- Services --------------------------------------------- */
#services .section-sub { margin-bottom: 48px; }

.services-note {
  margin-top: 40px;
  padding: 20px 24px;
  background: var(--accent-dim);
  border: 1px solid rgba(255,100,10,0.2);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--cream);
}
.services-note strong { color: var(--accent); }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  border-radius: 3px 0 0 3px;
  opacity: 0;
  transition: opacity var(--transition);
}
.card:hover { border-color: rgba(255,100,10,0.35); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,0.3); }
.card:hover::before { opacity: 1; }

.card-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-dim);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 12px;
}

.card p { font-size: 14px; line-height: 1.7; }

.card ul {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card ul li {
  font-size: 14px;
  padding-left: 16px;
  position: relative;
}
.card ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 12px;
}

/* --- Results ---------------------------------------------- */
#results {
  background: var(--bg-card);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.result-item {
  background: var(--bg-card);
  padding: 40px 24px;
  text-align: center;
  transition: background var(--transition);
}
.result-item:hover { background: var(--bg-card2); }

.result-number {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 8px;
}

.result-label {
  font-size: 13px;
  color: var(--body);
  line-height: 1.4;
}
.result-sub {
  font-size: 11px;
  color: var(--muted);
  margin-top: 4px;
}

/* --- About ------------------------------------------------ */
#about {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

#about .about-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

.about-bio {
  font-size: 18px;
  color: var(--body);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 40px;
}
.about-bio strong { color: var(--cream); }

.skills-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.skill-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--cream);
  transition: border-color var(--transition), color var(--transition);
}
.skill-badge:hover { border-color: var(--accent); color: var(--accent); }

.tools-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.tool-tag {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  color: var(--body);
  font-weight: 500;
}

/* --- Experience ------------------------------------------- */
#experience .timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}
#experience .timeline::before {
  content: '';
  position: absolute;
  left: 140px;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0 40px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.timeline-item:last-child { border-bottom: none; }

.timeline-item::after {
  content: '';
  position: absolute;
  left: 136px;
  top: 40px;
  width: 9px;
  height: 9px;
  background: var(--accent);
  border-radius: 50%;
  border: 2px solid var(--bg);
}

.timeline-date {
  font-size: 12px;
  color: var(--muted);
  padding-top: 4px;
  text-align: right;
  padding-right: 0;
  line-height: 1.4;
}

.timeline-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 4px;
}

.timeline-meta {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.timeline-meta span {
  color: var(--muted);
}

.timeline-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.timeline-content ul li {
  font-size: 14px;
  padding-left: 16px;
  position: relative;
  color: var(--body);
}
.timeline-content ul li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--accent);
  font-weight: 700;
}

/* --- Testimonials ----------------------------------------- */
#testimonials .reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: border-color var(--transition);
}
.review-card:hover { border-color: rgba(255,100,10,0.3); }

.review-stars {
  display: flex;
  gap: 3px;
  color: var(--accent);
  font-size: 14px;
}

.review-text {
  font-size: 15px;
  color: var(--cream);
  line-height: 1.7;
  font-style: italic;
  flex: 1;
}
.review-text::before { content: '"'; }
.review-text::after  { content: '"'; }

.review-meta {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.review-author {
  font-size: 14px;
  font-weight: 600;
  color: var(--cream);
}
.review-source {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

/* --- Contact ---------------------------------------------- */
#contact {
  text-align: center;
}

#contact .section-title { margin: 0 auto 16px; }
#contact .section-sub { margin: 0 auto 40px; }

.contact-ctas {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.contact-details {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--body);
  transition: color var(--transition);
}
.contact-item:hover { color: var(--cream); }
.contact-item .ci-icon { font-size: 16px; }

/* --- Footer ----------------------------------------------- */
footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy {
  font-size: 13px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: 13px;
  color: var(--muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--cream); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet — 1024px */
@media (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .results-grid { grid-template-columns: repeat(3, 1fr); }
  #experience .timeline::before { left: 100px; }
  .timeline-item { grid-template-columns: 100px 1fr; gap: 0 24px; }
  .timeline-item::after { left: 96px; }
}

/* Mobile — 768px */
@media (max-width: 768px) {
  section { padding: 64px 0; }
  #hero { padding: 120px 0 64px; }

  /* Nav mobile */
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; padding: 16px 24px; gap: 4px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }

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

  #experience .timeline::before { display: none; }
  .timeline-item { grid-template-columns: 1fr; gap: 4px; }
  .timeline-item::after { display: none; }
  .timeline-date { text-align: left; }

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

  .proof-inner { flex-direction: column; align-items: flex-start; }

  .hero-stats { gap: 8px; }
  .stat-pill { font-size: 13px; }
}

/* Small mobile — 480px */
@media (max-width: 480px) {
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { justify-content: center; }
  .contact-ctas { flex-direction: column; align-items: stretch; }
  .contact-ctas .btn { justify-content: center; }
  .results-grid { grid-template-columns: repeat(2, 1fr); }
}