/* ============================================================================
   Adelina Urzhanova — portfolio · shared foundation
   Tokens, reset, page shell, sidebar and controls. Loaded by every page.

   Layout model:
     desktop (>= 900px) — fixed 374px author column, 6-column dense tile grid
     mobile  (<  900px) — single stacked column, tile reveal on scroll
   Theme follows prefers-color-scheme until the visitor uses the toggle; from
   then on their choice is persisted in localStorage and wins.
   ========================================================================== */

/* ── Theme tokens ─────────────────────────────────────────────────────────── */

:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f7;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --divider: rgba(0, 0, 0, 0.08);
  --card-border: rgba(0, 0, 0, 0.06);
  --surface: rgba(0, 0, 0, 0.06);
  --surface-strong: rgba(0, 0, 0, 0.1);
  --accent: #1d1d1f;
  --accent-contrast: #ffffff;
  --soon-border: rgba(0, 0, 0, 0.24);
}

[data-theme="dark"] {
  --bg: #000000;
  --bg-secondary: #1c1c1e;
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #86868b;
  --divider: rgba(255, 255, 255, 0.1);
  --card-border: rgba(255, 255, 255, 0.08);
  --surface: rgba(255, 255, 255, 0.08);
  --surface-strong: rgba(255, 255, 255, 0.14);
  --accent: #f5f5f7;
  --accent-contrast: #1d1d1f;
  --soon-border: rgba(255, 255, 255, 0.32);
}

/* ── Reset / base ─────────────────────────────────────────────────────────── */

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  background: var(--bg);
  color-scheme: light;
}

[data-theme="dark"] { color-scheme: dark; }

body {
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

/* Filtering hides cards with the `hidden` attribute — beat the display rules. */
[hidden] { display: none !important; }

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  color: #0052a3;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page {
  background: var(--bg);
  min-height: 100vh;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-primary);
  transition: background 0.2s ease, color 0.2s ease;
}

/* ── Entrance + splash animations ─────────────────────────────────────────── */

@keyframes om-enter {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes om-splash-spin { to { transform: rotate(360deg); } }
@keyframes om-splash-out  { to { opacity: 0; visibility: hidden; } }

@media (prefers-reduced-motion: reduce) {
  @keyframes om-enter {
    from { opacity: 1; }
    to   { opacity: 1; }
  }
}

#om-splash {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

#om-splash.done {
  animation: om-splash-out 0.55s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

#om-splash i {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  opacity: 0.35;
  animation: om-splash-spin 0.8s linear infinite;
}

/* ── Layout: mobile first (< 900px) ───────────────────────────────────────── */

.layout {
  display: flex;
  flex-direction: column;
}

.author {
  padding: 16px 16px 32px;
  display: flex;
  flex-direction: column;
  animation: om-enter 0.85s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.work {
  padding: 8px 16px 40px;
  animation: om-enter 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.06s both;
}

/* On mobile the reading order is: identity → contacts → experience. */
.contacts-block { order: 1; margin-bottom: 28px; }
.exp-label,
.exp-block { order: 2; }

/* ── Author column ────────────────────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 16px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.avatar-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: none;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.avatar-circle img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.logo {
  width: 190px;
  height: 50px;
  display: block;
  margin-bottom: 28px;
}

/* Text stand-in used only if the Lottie wordmark fails to load. */
.logo.is-fallback {
  height: auto;
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.011em;
  color: var(--text-primary);
  line-height: 50px;
  white-space: nowrap;
}

.bio {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 20px;
  letter-spacing: -0.002em;
  color: var(--text-secondary);
}

.section-label {
  font-size: 11px;
  line-height: 13px;
  letter-spacing: 0.006em;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.exp-label { margin-bottom: 10px; }

.exp-block {
  margin-bottom: 24px;
  flex-shrink: 0;
}

.exp-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid var(--divider);
}

.exp-row:last-child { border-bottom: none; }

.exp-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.exp-company-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.exp-company {
  font-size: 16px;
  letter-spacing: -0.003em;
  font-weight: 500;
  color: var(--text-primary);
}

.exp-role {
  font-size: 13px;
  letter-spacing: -0.001em;
  color: var(--text-tertiary);
}

.exp-dates {
  font-size: 12px;
  color: var(--text-tertiary);
  white-space: nowrap;
  padding-left: 12px;
}

.exp-logos {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.exp-logo {
  width: 18px;
  height: 18px;
  box-sizing: content-box;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  background-position: center;
  background-repeat: no-repeat;
  box-shadow: 0 0 0 1px var(--card-border);
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}

.exp-logo + .exp-logo { margin-left: -6px; }

.contacts-block { padding-top: 0; }

.contacts-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.contact-link {
  font-size: 13px;
  letter-spacing: -0.001em;
  background: var(--surface);
  color: var(--text-primary);
  padding: 9px 16px;
  border-radius: 980px;
  transition: box-shadow 0.2s ease;
  display: inline-block;
}

.contact-link:hover {
  color: var(--text-primary);
  box-shadow: inset 0 0 0 999px var(--surface-strong);
}

/* ── Controls: language switch + theme toggle ─────────────────────────────── */

.lang-switch {
  display: flex;
  align-items: center;
  height: 34px;
  background: var(--surface);
  border-radius: 980px;
  padding: 0 3px;
}

.lang-btn {
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0 11px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 980px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, filter 0.15s ease;
}

.lang-btn.is-active {
  background: var(--bg);
  color: var(--text-primary);
}

.theme-btn {
  background: var(--surface);
  border-radius: 980px;
  border: none;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

.theme-btn:hover {
  box-shadow: inset 0 0 0 999px var(--surface-strong);
}


/* ── Sub-page chrome: back link + the row it sits in ──────────────────────── */

/* On a sub-page the sidebar body is desktop-only; mobile gets just the top bar. */
.page-sub .sidebar-body { display: none; }

.back-link {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  letter-spacing: -0.001em;
  font-weight: 400;
  color: var(--text-primary);
  padding: 0 16px;
  height: 34px;
  box-sizing: border-box;
  border-radius: 980px;
  background: var(--surface);
  transition: box-shadow 0.2s ease;
}

.back-link:hover {
  color: var(--text-primary);
  box-shadow: inset 0 0 0 999px var(--surface-strong);
}

.back-arrow {
  margin-right: 8px;
  font-size: 16px;
}

/* Desktop-only row above the article; the mobile equivalent is .topbar. */
.topbar-row {
  display: none;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-link { display: block; text-decoration: none; }

/* ── Reduced motion ───────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .om-shimmer { animation: none !important; }
}

/* ── Desktop (>= 900px) ───────────────────────────────────────────────────── */

@media (min-width: 900px) {
  .layout {
    display: block;
    max-width: 1472px;
    margin: 0 auto;
    position: relative;
    padding: 32px 32px 80px;
  }

  /* Pinned to the design's 1472px column, then flush left on narrower screens. */
  .author {
    position: fixed;
    top: 32px;
    left: max(32px, calc((100vw - 1472px) / 2 + 32px));
    width: 374px;
    height: calc(100vh - 64px);
    min-height: 0;
    overflow-y: auto;
    padding: 0 14px 0 0;
    animation-duration: 0.9s;
  }

  .work {
    margin-left: 408px;
    max-width: 1000px;
    min-width: 0;
    padding: 0;
    animation: om-enter 0.95s cubic-bezier(0.22, 1, 0.36, 1) 0.12s both;
  }

  /* Desktop restores the natural order and hides the mobile top bar. */
  .topbar { display: none; }
  .contacts-block { order: 0; margin-bottom: 0; padding-top: 24px; padding-bottom: 8px; flex-shrink: 0; }
  .exp-label,
  .exp-block { order: 0; }

  .logo { margin-bottom: 20px; }

  /* Must out-specify `.page-sub .sidebar-body { display: none }` above. */
  .page-sub .sidebar-body { display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0; }
  .topbar-row { display: flex; }
}

/* Contacts sink to the bottom of the sidebar only when there's room for it. */
@media (min-width: 900px) and (min-height: 820px) {
  .contacts-block { margin-top: auto; }
}