/* ==========================================================================
   KANTARDZHIEV.DEV — Swiss-Editorial Engineering Stylesheet
   Architecture: Pure Vanilla CSS, 1px Hairline Structural Grid, Print-Ready
   Security: 100% CSP 'style-src self' compliant (Zero inline styles)
   ========================================================================== */

:root {
  /* Light Paper Theme (Default) */
  --bg-canvas: #F3F2EE;
  --bg-sheet: #FAF9F5;
  --bg-elevated: #EFECE6;
  --bg-accent-subtle: #E6E3DC;

  --text-primary: #111215;
  --text-secondary: #3E4149;
  --text-muted: #656973;

  --border-strong: #111215;
  --border-hairline: #C8C5BC;

  --accent-signal: #C83E1B; /* Swiss International Orange-Red */
  --status-ok: #176B3A;

  /* System Typography Stacks (Zero External Font Calls) */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --max-width: 1140px;
}

html[data-theme="dark"] {
  /* Dark Carbon Theme */
  --bg-canvas: #0A0B0D;
  --bg-sheet: #111317;
  --bg-elevated: #181B20;
  --bg-accent-subtle: #20242C;

  --text-primary: #F0EFEA;
  --text-secondary: #B8BBC2;
  --text-muted: #7E838F;

  --border-strong: #F0EFEA;
  --border-hairline: #2A2E37;

  --accent-signal: #E85D3B;
  --status-ok: #2EA043;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.55;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  padding: 0 1rem 3rem;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  background: var(--text-primary);
  color: var(--bg-sheet);
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0.5rem;
}

/* Focus Ring Standard */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-signal);
  outline-offset: 2px;
}

/* SVG Icons */
.icon {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  flex-shrink: 0;
}

.icon-inline {
  width: 13px;
  height: 13px;
  stroke: var(--accent-signal);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  flex-shrink: 0;
}

.icon-xs {
  width: 11px;
  height: 11px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  flex-shrink: 0;
}

/* Theme Icon Visibility */
html[data-theme="light"] .icon-sun {
  display: none;
}

html[data-theme="dark"] .icon-moon {
  display: none;
}

/* ==========================================================================
   Utility & Telemetry Header Bar
   ========================================================================== */

.utility-bar {
  max-width: var(--max-width);
  margin: 1.25rem auto 0;
  background-color: var(--bg-sheet);
  border: 1px solid var(--border-strong);
  border-bottom: none;
}

.utility-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1.25rem;
  gap: 0.75rem;
}

.utility-id {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-signal);
  display: inline-block;
}

.utility-divider {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.utility-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border-hairline);
}

.ctrl-btn {
  appearance: none;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-hairline);
  padding: 0.3rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.lang-switch .ctrl-btn {
  border: none;
  border-right: 1px solid var(--border-hairline);
}

.lang-switch .ctrl-btn:last-child {
  border-right: none;
}

.ctrl-btn:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
}

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

/* ==========================================================================
   Main Swiss Sheet & Dossier Header
   ========================================================================== */

.sheet {
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: var(--bg-sheet);
  border: 1px solid var(--border-strong);
}

.dossier-header {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  border-bottom: 1px solid var(--border-strong);
}

.dossier-primary {
  padding: 2.25rem 2rem;
  border-right: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-signal);
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.person-name {
  font-size: clamp(1.9rem, 3.5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 0.5rem;
}

.person-role {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.dossier-meta {
  display: flex;
  flex-direction: column;
  justify-content: stretch;
}

.meta-grid {
  display: grid;
  grid-template-columns: 1fr;
  height: 100%;
}

.meta-cell {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.15rem;
}

.meta-cell:last-child {
  border-bottom: none;
}

.meta-key {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.meta-val {
  font-size: 0.86rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-variant-numeric: tabular-nums;
}

.meta-val-action {
  justify-content: space-between;
  flex-wrap: wrap;
}

.mono-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.mono-link:hover {
  color: var(--accent-signal);
  border-bottom-color: var(--accent-signal);
}

.external-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.copy-btn {
  appearance: none;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-hairline);
  padding: 0.15rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.copy-btn:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

.copy-btn.is-copied {
  background-color: var(--status-ok);
  border-color: var(--status-ok);
  color: #FFFFFF;
}

/* ==========================================================================
   Structural Section Grid (Sidebar + Main Column)
   ========================================================================== */

.grid-section {
  display: grid;
  grid-template-columns: 240px 1fr;
  border-bottom: 1px solid var(--border-strong);
}

.grid-section:last-child {
  border-bottom: none;
}

.section-sidebar {
  padding: 1.75rem 1.5rem;
  border-right: 1px solid var(--border-hairline);
  background-color: var(--bg-sheet);
}

.section-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-signal);
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.sidebar-note {
  margin-top: 0.85rem;
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.section-body {
  padding: 1.75rem 2rem;
}

/* ==========================================================================
   01 // Profile & Operational Pillars
   ========================================================================== */

.lead-paragraph {
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.kpi-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border-hairline);
}

.kpi-cell {
  padding: 0.75rem 0.9rem;
  border-right: 1px solid var(--border-hairline);
  background-color: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.kpi-cell:last-child {
  border-right: none;
}

.kpi-code {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-signal);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.kpi-name {
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.3;
}

/* ==========================================================================
   02 // Experience Entries
   ========================================================================== */

.exp-entry {
  padding-bottom: 1.75rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-hairline);
}

.exp-entry:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.exp-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.exp-role {
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.exp-org {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

.org-link {
  color: var(--text-secondary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border-bottom: 1px solid var(--border-hairline);
}

.org-link:hover {
  color: var(--accent-signal);
  border-bottom-color: var(--accent-signal);
}

.exp-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.exp-period {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  padding: 0.18rem 0.55rem;
}

.exp-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem;
  text-transform: uppercase;
}

.exp-badge.is-current {
  background-color: var(--accent-signal);
  color: #FFFFFF;
}

.exp-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.exp-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.exp-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   03 // Interactive Technical Matrix
   ========================================================================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-hairline);
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.filter-btn {
  appearance: none;
  background-color: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-hairline);
  padding: 0.32rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.filter-btn:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

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

.filter-telemetry {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.mono-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-signal);
  font-variant-numeric: tabular-nums;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--border-hairline);
  border-left: 1px solid var(--border-hairline);
}

.skill-card {
  padding: 1.15rem 1.25rem;
  border-right: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-sheet);
}

.skill-card.is-hidden {
  display: none;
}

.skill-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.skill-code {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.skill-cat-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.skill-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.22rem 0.55rem;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  color: var(--text-primary);
}

/* ==========================================================================
   04 // Home Lab Specification Block
   ========================================================================== */

.lab-banner {
  border: 1px solid var(--border-hairline);
  background-color: var(--bg-elevated);
}

.lab-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 1.15rem;
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-accent-subtle);
}

.lab-status {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--status-ok);
}

.lab-description {
  padding: 1.15rem;
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-hairline);
}

.lab-specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.lab-spec-cell {
  padding: 0.85rem 1.15rem;
  border-right: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.lab-spec-cell:last-child {
  border-right: none;
}

.spec-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.spec-value {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ==========================================================================
   05 // Education Grid
   ========================================================================== */

.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--border-hairline);
}

.edu-card {
  padding: 1.15rem 1.25rem;
  border-right: 1px solid var(--border-hairline);
}

.edu-card:last-child {
  border-right: none;
}

.edu-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.edu-code {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-signal);
  font-weight: 600;
}

.edu-period {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.edu-degree {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.edu-school {
  font-size: 0.86rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.sheet-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: var(--bg-sheet);
  border: 1px solid var(--border-strong);
  border-top: none;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 1.25rem;
  gap: 0.5rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 900px) {
  .dossier-header {
    grid-template-columns: 1fr;
  }

  .dossier-primary {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
  }

  .grid-section {
    grid-template-columns: 1fr;
  }

  .section-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 0.65rem;
    flex-wrap: wrap;
  }

  .sidebar-note {
    width: 100%;
    margin-top: 0.25rem;
  }

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

  .kpi-cell:nth-child(2) {
    border-right: none;
  }

  .kpi-cell:nth-child(1),
  .kpi-cell:nth-child(2) {
    border-bottom: 1px solid var(--border-hairline);
  }

  .lab-specs {
    grid-template-columns: 1fr;
  }

  .lab-spec-cell {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
  }

  .lab-spec-cell:last-child {
    border-bottom: none;
  }
}

@media (max-width: 640px) {
  body {
    padding: 0 0.5rem 2rem;
  }

  .section-body,
  .dossier-primary {
    padding: 1.25rem;
  }

  .skills-grid,
  .edu-grid,
  .kpi-strip {
    grid-template-columns: 1fr;
  }

  .kpi-cell {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
  }

  .kpi-cell:last-child {
    border-bottom: none;
  }

  .edu-card {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
  }

  .edu-card:last-child {
    border-bottom: none;
  }
}

/* ==========================================================================
   Print Stylesheet (@media print) — One-Click A4 CV Export
   ========================================================================== */

@media print {
  @page {
    size: A4 portrait;
    margin: 10mm 12mm;
  }

  html,
  body {
    background-color: #FFFFFF !important;
    color: #000000 !important;
    font-size: 9.5pt;
    line-height: 1.4;
    padding: 0 !important;
    margin: 0 !important;
  }

  .utility-bar,
  .skip-link,
  .copy-btn,
  .filter-bar,
  .sidebar-note,
  .sheet-footer {
    display: none !important;
  }

  .sheet {
    max-width: 100% !important;
    border: 1px solid #000000 !important;
    background-color: #FFFFFF !important;
  }

  .dossier-header {
    grid-template-columns: 1.3fr 1fr !important;
    border-bottom: 1px solid #000000 !important;
  }

  .dossier-primary {
    padding: 1rem 1.25rem !important;
    border-right: 1px solid #CCCCCC !important;
  }

  .person-name {
    font-size: 18pt !important;
  }

  .meta-cell {
    padding: 0.35rem 0.85rem !important;
    border-bottom: 1px solid #CCCCCC !important;
  }

  .grid-section {
    grid-template-columns: 130px 1fr !important;
    border-bottom: 1px solid #000000 !important;
  }

  .section-sidebar {
    padding: 0.85rem !important;
    border-right: 1px solid #CCCCCC !important;
    background-color: #FFFFFF !important;
  }

  .section-body {
    padding: 0.85rem 1.15rem !important;
  }

  /* Ensure all filtered skills are visible when printing */
  .skill-card.is-hidden {
    display: block !important;
  }

  .skills-grid {
    grid-template-columns: repeat(3, 1fr) !important;
  }

  .skill-card {
    padding: 0.55rem 0.65rem !important;
  }

  .exp-entry,
  .edu-card,
  .lab-banner,
  .skill-card {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .exp-entry {
    padding-bottom: 0.75rem !important;
    margin-bottom: 0.75rem !important;
  }

  a {
    color: #000000 !important;
    text-decoration: none !important;
  }
}