/* ========================================
   chepelovskyi.com — minimalist design
   ======================================== */

:root {
  --bg:            #F5F6F8;
  --bg-secondary:  #ECEEF2;
  --text:          #1A1D23;
  --text-muted:    #6B7280;
  --accent:        #3B82F6;
  --accent-light:  #EFF6FF;
  --border:        #E2E5EA;
  --white:         #FFFFFF;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Georgia', 'Times New Roman', serif;

  --maxw: 720px;
  --maxw-read: 680px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body { min-height: 100vh; display: flex; flex-direction: column; }

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s ease; }
a:hover { opacity: 0.7; }

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

/* ── Layout containers ── */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.container-read {
  width: 100%;
  max-width: var(--maxw-read);
  margin: 0 auto;
  padding: 0 24px;
}

main { flex: 1; padding: 32px 0 96px; }

/* ════════════════════════════════════════
   NAVIGATION
   ════════════════════════════════════════ */
.nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: rgba(245, 246, 248, 0.9);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav-link {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 400;
  position: relative;
  transition: color 0.2s ease;
}
.nav-link:hover { color: var(--text); opacity: 1; }
.nav-link.active { color: var(--text); font-weight: 500; }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -22px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* Hamburger (mobile) */
.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 40px;
  height: 40px;
  cursor: pointer;
  padding: 0;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  position: absolute;
  left: 10px;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: all 0.25s ease;
}
.nav-toggle span { top: 50%; transform: translateY(-50%); }
.nav-toggle span::before,
.nav-toggle span::after { content: ''; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top:  6px; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after  { top: 0; transform: rotate(-45deg); }

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-link {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-link:last-child { border-bottom: 0; }
  .nav-link.active::after { display: none; }
  .nav-link.active { color: var(--accent); }
}

/* ════════════════════════════════════════
   HERO (home page)
   ════════════════════════════════════════ */
.hero {
  padding: 120px 0 80px;
  text-align: center;
}
.hero-quote {
  font-family: var(--font-serif);
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.35;
  font-weight: 400;
  color: var(--text);
  margin: 0 auto 24px;
  max-width: 620px;
  font-style: italic;
}
.hero-attr {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 56px;
  letter-spacing: 0.02em;
}
.hero-tagline {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.6;
  color: var(--text);
  margin: 0 auto 48px;
  max-width: 560px;
  font-style: italic;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--accent);
  padding: 12px 0;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}
.hero-cta:hover { opacity: 1; border-bottom-color: var(--accent); }
.hero-cta-arrow { transition: transform 0.2s ease; }
.hero-cta:hover .hero-cta-arrow { transform: translateX(3px); }

/* ════════════════════════════════════════
   SECTIONS (home)
   ════════════════════════════════════════ */
.section { padding: 64px 0; }
.section + .section { border-top: 1px solid var(--border); }
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
  gap: 16px;
}
.section-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0;
}
.section-link {
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
}

/* ── Note cards (home + notes list) ── */
.note-list { display: flex; flex-direction: column; gap: 8px; }
.note-card {
  display: block;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  transition: opacity 0.2s ease;
}
.note-card:last-child { border-bottom: 0; }
.note-card:hover { opacity: 1; }
.note-card:hover .note-card-title { color: var(--accent); }

.note-card-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--text-muted);
}
.note-card-lang {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--text-muted);
}
.note-card-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text);
  line-height: 1.3;
  transition: color 0.2s ease;
}
.note-card-excerpt {
  font-size: 15px;
  color: var(--text-muted);
  margin: 0 0 10px;
  line-height: 1.55;
}
.note-card-more {
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
}

/* ── Poetry grid ── */
.poetry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.poem-card {
  display: block;
  padding: 28px 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  transition: all 0.25s ease;
}
.poem-card:hover {
  opacity: 1;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.08);
}
.poem-card-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  margin: 0 0 12px;
  color: var(--text);
}
.poem-card-preview {
  font-family: var(--font-serif);
  font-size: 15px;
  font-style: italic;
  color: var(--text-muted);
  margin: 0 0 16px;
  line-height: 1.7;
  white-space: pre-line;
}
.poem-card-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}
.poem-card-year { letter-spacing: 0.04em; }
@media (max-width: 600px) {
  .poetry-grid { grid-template-columns: 1fr; }
}

/* ── YouTube banner (home) ── */
.yt-banner {
  background: var(--accent-light);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: 16px;
  padding: 48px 32px;
  text-align: center;
}
.yt-banner-title {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--text);
}
.yt-banner-sub {
  color: var(--text-muted);
  margin: 0 0 24px;
  font-size: 15px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--white);
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  border: 0;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn:hover {
  opacity: 1;
  background: #2563EB;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--white);
  border-color: var(--accent);
}

/* ════════════════════════════════════════
   PAGE — headings, articles
   ════════════════════════════════════════ */
.page-header {
  padding: 48px 0 32px;
  text-align: left;
}
.page-header.center { text-align: center; }
.page-title {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  line-height: 1.15;
}
.page-epigraph {
  font-family: var(--font-serif);
  font-size: 16px;
  font-style: italic;
  color: var(--text-muted);
  margin: 0;
}
.page-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin: 0;
}

/* Long-form article (path.html, notes/*.html) */
.article {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.8;
  color: var(--text);
}
.article h2 {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 56px 0 16px;
}
.article h2:first-child { margin-top: 0; }
.article p { margin: 0 0 20px; }
.article em, .article i { color: var(--text); }
.article blockquote {
  margin: 28px 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
  font-style: italic;
}

/* Poetry full-text page */
.poem-full {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 2;
  text-align: center;
  white-space: pre-line;
  color: var(--text);
  margin: 48px 0;
}
.poem-full-meta {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 24px;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 32px;
  transition: color 0.2s ease;
}
.back-link:hover { color: var(--accent); opacity: 1; }

/* ════════════════════════════════════════
   NOTES — search input
   ════════════════════════════════════════ */
.search-wrap {
  margin: 32px 0 40px;
  position: relative;
}
.search-input {
  width: 100%;
  padding: 14px 16px 14px 44px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-input:focus {
  outline: 0;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
.search-input::placeholder { color: var(--text-muted); }
.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}
.search-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 0;
  font-size: 15px;
  display: none;
}

/* ════════════════════════════════════════
   YOUTUBE page
   ════════════════════════════════════════ */
.yt-intro {
  font-size: 17px;
  color: var(--text-muted);
  margin: 0 0 32px;
  line-height: 1.65;
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.video-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: var(--bg-secondary);
}
.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video-card-body { padding: 16px 18px; }
.video-card-title {
  font-size: 15px;
  font-weight: 500;
  margin: 0;
  color: var(--text);
}
@media (max-width: 600px) {
  .video-grid { grid-template-columns: 1fr; }
}

/* ════════════════════════════════════════
   CONTACT form
   ════════════════════════════════════════ */
.contact-intro {
  font-family: var(--font-serif);
  font-size: 19px;
  font-style: italic;
  color: var(--text);
  margin: 0 0 40px;
  line-height: 1.6;
}
.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}
.form-input,
.form-textarea {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 16px;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-input:focus,
.form-textarea:focus {
  outline: 0;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
.form-textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.55;
}
.form-submit { align-self: flex-start; }

.form-status {
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 14px;
  margin-top: 4px;
  display: none;
}
.form-status.show { display: block; }
.form-status.success {
  background: #F0FDF4;
  color: #166534;
  border: 1px solid #BBF7D0;
}
.form-status.error {
  background: #FEF2F2;
  color: #991B1B;
  border: 1px solid #FECACA;
}

.contact-foot {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

/* ════════════════════════════════════════
   FOOTER
   ════════════════════════════════════════ */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 48px;
  background: var(--bg);
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); opacity: 1; }
.footer-domain {
  font-size: 12px;
  letter-spacing: 0.04em;
}
@media (max-width: 520px) {
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

/* ════════════════════════════════════════
   UTILITIES + ANIMATIONS
   ════════════════════════════════════════ */
.fade-in {
  opacity: 0;
  transform: translateY(10px);
  animation: fadeIn 0.6s ease forwards;
}
.fade-in.delay-1 { animation-delay: 0.1s; }
.fade-in.delay-2 { animation-delay: 0.2s; }
.fade-in.delay-3 { animation-delay: 0.3s; }
@keyframes fadeIn {
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .fade-in.delay-1,
  .fade-in.delay-2,
  .fade-in.delay-3 {
    animation: none;
    opacity: 1;
    transform: none;
  }
  * { transition-duration: 0.01ms !important; }
}

/* 404 */
.error-wrap {
  padding: 120px 0;
  text-align: center;
}
.error-code {
  font-size: 72px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.04em;
  margin: 0 0 16px;
}
.error-text {
  color: var(--text-muted);
  margin: 0 0 32px;
}