/* ═══════════════════════════════════════════════
   Vladimir Ivanov — Personal Site
   Design: dark terminal-meets-editorial
   Fonts: Syne (display) + JetBrains Mono (body)
═══════════════════════════════════════════════ */

@import url("https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=JetBrains+Mono:wght@300;400;500;600&display=swap");

:root {
  /* Colors */
  --bg: #09090e;
  --surface: #0f0f17;
  --surface2: #171722;
  --surface3: #1e1e2e;
  --border: #252535;
  --border-hi: #3a3a55;
  --text: #e4e4f0;
  --text-muted: #8a8aa4;
  --text-dim: #4a4a64;
  --accent: #7b6ef6;
  --accent-hi: #9d93f8;
  --accent-glow: rgba(123, 110, 246, 0.12);
  --green: #5ef0a0;
  --green-glow: rgba(94, 240, 160, 0.1);
  --red: #f06e6e;
  --red-glow: rgba(240, 110, 110, 0.1);
  --gold: #f0c86e;

  /* Typography scale */
  --fs-base: 14px;
  --fs-sm: 13px;
  --fs-xs: 11px;
  --fs-xxs: 10px;
  --fs-tag: 12px;
  --fs-heading: 15px;
  --lh-body: 1.8;

  /* Spacing & shape */
  --radius: 4px;
  --nav-h: 56px;
}

/* RESET */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: "JetBrains Mono", monospace;
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* GRID BG */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(123, 110, 246, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123, 110, 246, 0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

/* NOISE OVERLAY */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  opacity: 0.4;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(9, 9, 14, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: "Syne", sans-serif;
  font-weight: 800;
  font-size: 16px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}
.nav-links a.active::after {
  content: "";
  display: block;
  height: 1px;
  background: var(--accent);
  margin-top: 1px;
}

/* ── PAGE WRAPPER ── */
.page {
  padding-top: calc(var(--nav-h) + 60px);
  padding-bottom: 120px;
}

/* ── SECTION ── */
.section {
  margin-bottom: 72px;
}

.section-label {
  font-size: var(--fs-xxs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── TIMELINE ── */
.timeline {
  display: flex;
  flex-direction: column;
}
.tl-item {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 0 12px;
}
.tl-dot-col {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tl-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--surface2);
  border: 2px solid var(--border);
  flex-shrink: 0;
  margin-top: 5px;
  transition:
    border-color 0.2s,
    background 0.2s;
}
.tl-item:hover .tl-dot {
  border-color: var(--accent);
  background: var(--accent-glow);
}
.tl-line {
  width: 1px;
  flex: 1;
  background: var(--border);
  min-height: 14px;
}
.tl-item:last-child .tl-line {
  display: none;
}
.tl-content {
  padding-bottom: 28px;
}
a.tl-content {
  text-decoration: none;
  color: inherit;
  display: block;
  border-radius: 4px;
  padding: 12px;
  transition: background 0.15s;
}
a.tl-content:hover {
  background: var(--surface);
}
a.tl-content .tl-link-hint {
  display: inline-block;
  font-size: var(--fs-xxs);
  color: var(--text-dim);
  letter-spacing: 0.05em;
  transition: color 0.15s;
}
a.tl-content:hover .tl-link-hint {
  color: var(--accent);
}
.tl-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 3px;
}
.tl-role {
  font-family: "Syne", sans-serif;
  font-size: var(--fs-heading);
  font-weight: 700;
  color: var(--text);
}
.tl-company {
  font-size: var(--fs-sm);
  color: var(--accent);
  font-weight: 500;
}
.tl-period {
  color: var(--text-dim);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  margin-left: auto;
  white-space: nowrap;
}
.tl-desc {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  margin-top: 5px;
}
.tl-note {
  display: inline-block;
  margin-top: 6px;
  font-size: var(--fs-xxs);
  letter-spacing: 0.08em;
  color: var(--gold);
  opacity: 0.8;
}

/* ── TAGS ── */
.tag {
  position: relative;
  display: inline-block;
}
.tag-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px 5px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: "JetBrains Mono", monospace;
  font-size: var(--fs-tag);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.tag-btn:hover {
  border-color: var(--border-hi);
  color: var(--text);
  background: var(--surface2);
}
.tag-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  flex-shrink: 0;
}
.tag[data-level="built"] .tag-dot {
  background: var(--green);
}
.tag[data-level="used"] .tag-dot {
  background: var(--accent);
}
.tag[data-level="knows"] .tag-dot {
  background: var(--text-dim);
}
.tag.open[data-level="built"] .tag-btn {
  border-color: var(--green);
  box-shadow: 0 0 0 1px var(--green);
  background: var(--green-glow);
  color: var(--text);
}
.tag.open[data-level="used"] .tag-btn {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  background: var(--accent-glow);
  color: var(--text);
}
.tag.open[data-level="knows"] .tag-btn {
  border-color: var(--border-hi);
  color: var(--text);
}
.tag-chevron {
  font-size: 9px;
  color: var(--text-dim);
  transition:
    transform 0.2s,
    color 0.15s;
}
.tag.open .tag-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

/* TAG CARD */
.tag-card {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 310px;
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  padding: 16px;
  z-index: 200;
  box-shadow:
    0 24px 64px rgba(0, 0, 0, 0.8),
    0 0 0 1px rgba(123, 110, 246, 0.08);
  animation: cardIn 0.15s ease;
}
@media (max-width: 600px) {
  .tag-card {
    position: fixed;
    left: 12px;
    right: 12px;
    top: auto;
    bottom: 12px;
    width: auto;
    max-height: 70vh;
    overflow-y: auto;
  }
}
.tag.open .tag-card {
  display: block;
}
@keyframes cardIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.card-name {
  font-family: "Syne", sans-serif;
  font-size: var(--fs-heading);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.card-field {
  margin-bottom: 10px;
}
.card-field:last-child {
  margin-bottom: 0;
}
.card-field-label {
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 3px;
}
.card-field-val {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  line-height: 1.65;
}
.level-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 2px;
  font-size: var(--fs-xs);
  font-weight: 500;
}
.level-built {
  background: rgba(94, 240, 160, 0.12);
  color: var(--green);
}
.level-used {
  background: rgba(123, 110, 246, 0.15);
  color: var(--accent-hi);
}
.level-knows {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 3px;
}
.chip {
  padding: 2px 7px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
.chip-action {
  padding: 2px 7px;
  background: var(--red-glow);
  border: 1px solid rgba(240, 110, 110, 0.2);
  border-radius: 2px;
  font-size: var(--fs-xs);
  color: var(--red);
}

/* ── LEGEND ── */
.legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  align-items: center;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
.legend-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}
.hint {
  font-size: var(--fs-xxs);
  color: var(--text-dim);
  letter-spacing: 0.04em;
  margin-left: auto;
}

/* ── DOMAIN GROUP ── */
.domain-group {
  margin-bottom: 32px;
}
.domain-label {
  font-size: var(--fs-xxs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ── PROJECT CARDS ── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition:
    border-color 0.2s,
    transform 0.2s,
    box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
a.project-card {
  cursor: pointer;
}
a.project-card:hover {
  border-color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}
.project-card:hover {
  border-color: var(--border-hi);
}
.project-card-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.project-card-title {
  font-family: "Syne", sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.project-card-role {
  font-size: var(--fs-xs);
  color: var(--accent);
  letter-spacing: 0.05em;
}
.project-card-desc {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}
.project-card-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.project-meta-chip {
  padding: 2px 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: var(--fs-xs);
  color: var(--text-dim);
}
.project-card-arrow {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  margin-top: auto;
  transition:
    color 0.15s,
    transform 0.15s;
}
.project-card:hover .project-card-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ── REFERENCES ── */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
}
.ref-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ref-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  overflow: hidden;
}
.ref-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ref-name {
  font-family: "Syne", sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}
.ref-title {
  font-size: var(--fs-xs);
  color: var(--accent);
}
.ref-company {
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
.ref-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: var(--fs-xs);
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s;
  margin-top: auto;
}
.ref-link:hover {
  color: var(--accent);
}

/* ── CONTACT ROW ── */
.contact-row {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.contact-item {
  font-size: var(--fs-sm);
  color: var(--text-muted);
}
.contact-item span {
  color: var(--text-dim);
  margin-right: 6px;
  font-size: var(--fs-xxs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.contact-item a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.contact-item a:hover {
  color: var(--accent);
}

/* ── PROJECT PAGE SPECIFIC ── */
.project-hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 56px;
}
.project-logo-placeholder {
  width: 72px;
  height: 72px;
  border-radius: 14px;
  background: var(--surface2);
  border: 2px dashed var(--border-hi);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 24px;
  text-align: center;
  line-height: 1.4;
}
.project-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.project-title {
  font-family: "Syne", sans-serif;
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1;
  color: var(--text);
  margin-bottom: 10px;
}
.project-title span {
  color: var(--accent);
}
.project-subtitle {
  font-size: var(--fs-base);
  color: var(--text-muted);
  margin-bottom: 20px;
}
.stat-row {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 24px;
}
.stat {
  text-align: left;
}
.stat-num {
  font-family: "Syne", sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-size: var(--fs-xxs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 2px;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s;
  margin-bottom: 32px;
}
.back-link:hover {
  color: var(--accent);
}

/* ── CALLOUT ── */
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: var(--lh-body);
  margin-bottom: 24px;
}
.callout strong {
  color: var(--text);
  font-weight: 500;
}

/* ── PROSE LIST ── */
.prose-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.prose-list li {
  padding-left: 18px;
  position: relative;
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: var(--lh-body);
}
.prose-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: var(--fs-xxs);
  top: 3px;
}
.prose-list strong {
  color: var(--text);
  font-weight: 500;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.fade-up {
  animation: fadeUp 0.5s ease both;
}
.delay-1 {
  animation-delay: 0.1s;
}
.delay-2 {
  animation-delay: 0.2s;
}
.delay-3 {
  animation-delay: 0.3s;
}
.delay-4 {
  animation-delay: 0.4s;
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .nav-links {
    display: none;
  }
  .stat-row {
    gap: 20px;
  }
  .project-grid {
    grid-template-columns: 1fr;
  }
  .ref-grid {
    grid-template-columns: 1fr 1fr;
  }
}