/* ==========================================================================
   HOSEN MIAH — ACADEMIC & ENGINEERING CURRICULUM VITAE & DOSSIER
   Design System: Swiss Print-Editorial Monograph (Light Archival Paper)
   ========================================================================== */

:root {
  /* 60 / 30 / 10 Color System (OKLCH + Hex Fallback) */
  --bg-paper: #FAF8F5;
  --bg-ledger: #F2EFE9;
  --bg-sheet: #FFFFFF;
  --bg-ledger-hover: #E7E2D8;

  --ink-primary: #181816;
  --ink-secondary: #4A4742;

  --accent: #9A3412;
  --accent-hover: #7C2D12;
  --accent-tint: #FBECE6;

  --rule-hairline: #DDD8CE;
  --rule-strong: #181816;

  --status-ok-fg: #166534;
  --status-ok-bg: #ECFDF5;
  --status-err-fg: #991B1B;
  --status-err-bg: #FEF2F2;

  /* Typography Families */
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  /* Fluid Type Scale */
  --text-display: clamp(2.15rem, 3.6vw + 0.9rem, 3.35rem);
  --text-h1: clamp(1.65rem, 2.2vw + 0.7rem, 2.35rem);
  --text-h2: clamp(1.3rem, 1.5vw + 0.5rem, 1.65rem);
  --text-h3: clamp(1.08rem, 0.9vw + 0.45rem, 1.25rem);
  --text-body-lg: clamp(1.02rem, 0.35vw + 0.92rem, 1.125rem);
  --text-body: 1rem;
  --text-body-sm: 0.9375rem;
  --text-caption: 0.8125rem;
  --text-button: 0.875rem;

  /* Layout & Spacing Tokens */
  --container-max: 1160px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-pad-y: clamp(2.75rem, 5.5vw, 4.75rem);

  /* Radii & Shadows */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sheet: 0 2px 12px -2px rgba(24, 24, 22, 0.06), 0 1px 3px rgba(24, 24, 22, 0.04);
  --shadow-modal: 0 20px 45px -10px rgba(24, 24, 22, 0.18);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 160ms;
  --dur-med: 240ms;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-paper);
  color: var(--ink-primary);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.65;
  background-color: var(--bg-paper);
  color: var(--ink-primary);
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
}

/* Skip Link for Keyboard Users */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--gutter);
  background: var(--accent);
  color: var(--bg-paper);
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  z-index: 9999;
}

.skip-link:focus-visible {
  top: 0.75rem;
}

/* Universal Keyboard Focus Ring (Never Mouse-Click Flash) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ======================== TOP ARCHIVAL NAVBAR ======================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 248, 245, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule-hairline);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink-primary);
}

.brand-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.brand-code {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--ink-secondary);
  font-variant-numeric: tabular-nums;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.35rem 0.75rem;
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--ink-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out);
}

.nav-links a:hover,
.nav-links a[aria-current="true"] {
  color: var(--ink-primary);
  background-color: var(--bg-ledger);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  background: var(--bg-ledger);
  color: var(--ink-primary);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ======================== BUTTON PRIMITIVES ======================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.55rem 1.1rem;
  font-family: var(--font-sans);
  font-size: var(--text-button);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}

.btn:active:not(:disabled) {
  transform: scale(0.985);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--bg-paper);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--bg-ledger);
  color: var(--ink-primary);
  border-color: var(--rule-hairline);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-ledger-hover);
}

/* ======================== HERO / DOSSIER MASTHEAD ======================== */
.dossier-masthead {
  min-height: calc(100svh - 65px);
  display: flex;
  align-items: center;
  padding-block: clamp(1.75rem, 4vh, 3.25rem);
  border-bottom: 2px solid var(--rule-strong);
}

.masthead-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.75rem);
  align-items: start;
  width: 100%;
}

.masthead-left {
  grid-column: span 3 / span 3;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.portrait-frame {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1 / 1;
  background-color: var(--bg-sheet);
  padding: 6px;
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sheet);
  overflow: hidden;
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 3px;
}

.dossier-coordinates {
  background-color: var(--bg-ledger);
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.coord-row {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  font-size: var(--text-caption);
}

.coord-label {
  font-family: var(--font-mono);
  color: var(--ink-secondary);
  font-size: 0.75rem;
}

.coord-value,
.coord-value a {
  color: var(--ink-primary);
  font-weight: 500;
  text-decoration: none;
  word-break: break-word;
}

.coord-value a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.masthead-right {
  grid-column: span 9 / span 9;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.dossier-classification {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule-hairline);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--ink-secondary);
}

.masthead-title {
  font-family: var(--font-serif);
  font-size: var(--text-display);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
}

.masthead-subtitle {
  font-family: var(--font-serif);
  font-size: var(--text-h2);
  font-weight: 400;
  color: var(--accent);
  line-height: 1.3;
}

.masthead-summary {
  font-size: var(--text-body-lg);
  color: var(--ink-primary);
  max-width: 68ch;
  line-height: 1.65;
}

.interest-ledger {
  padding-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.interest-heading {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--ink-secondary);
}

.interest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
}

.interest-tag {
  background-color: var(--bg-ledger);
  color: var(--ink-primary);
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-caption);
  font-weight: 500;
}

.masthead-cta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding-top: 0.5rem;
}

/* ======================== SWISS MONOGRAPH SECTIONS ======================== */
.monograph-section {
  padding-block: var(--section-pad-y);
  border-bottom: 1px solid var(--rule-hairline);
}

.monograph-section.surface-ledger {
  background-color: var(--bg-ledger);
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.75rem);
  align-items: start;
}

.section-index-col {
  grid-column: span 3 / span 3;
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.section-numeral {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.section-title {
  font-family: var(--font-serif);
  font-size: var(--text-h1);
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink-primary);
}

.section-note {
  font-size: var(--text-caption);
  color: var(--ink-secondary);
  line-height: 1.5;
  margin-top: 0.25rem;
}

.section-content-col {
  grid-column: span 9 / span 9;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-width: 0;
}

/* ======================== 01. RESEARCH & WAVEFORM ======================== */
.research-monograph-sheet {
  background-color: var(--bg-sheet);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sheet);
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.research-meta-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--accent);
  border-bottom: 1px solid var(--rule-hairline);
  padding-bottom: 0.65rem;
}

.research-paper-title {
  font-family: var(--font-serif);
  font-size: var(--text-h2);
  font-weight: 600;
  color: var(--ink-primary);
  line-height: 1.3;
}

.research-supervisor {
  font-size: var(--text-body-sm);
  color: var(--ink-secondary);
}

.research-supervisor strong {
  color: var(--ink-primary);
}

.research-abstract-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  padding-top: 0.5rem;
}

.abstract-block {
  background-color: var(--bg-paper);
  padding: 1rem 1.15rem;
  border-radius: var(--radius-sm);
}

.abstract-block h4 {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--ink-secondary);
  margin-bottom: 0.35rem;
}

.abstract-block p {
  font-size: var(--text-body-sm);
  color: var(--ink-primary);
  line-height: 1.55;
}

/* Interactive 15-Level CHB-MLI SHE-PWM Diagram */
.waveform-figure {
  background-color: var(--bg-paper);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--rule-hairline);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.figure-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.figure-caption-title {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--ink-primary);
  font-weight: 600;
}

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

.waveform-btn {
  min-height: 36px;
  padding: 0.25rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--bg-ledger);
  color: var(--ink-primary);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.waveform-btn[aria-pressed="true"] {
  background-color: var(--accent);
  color: var(--bg-paper);
  border-color: var(--accent);
}

.waveform-svg-wrap {
  width: 100%;
  overflow: hidden;
}

.waveform-svg {
  width: 100%;
  height: auto;
  display: block;
}

.research-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  border-top: 1px solid var(--rule-hairline);
  padding-top: 1rem;
}

.metric-cell {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-secondary);
}

.metric-val {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--ink-primary);
  font-variant-numeric: tabular-nums;
}

/* ======================== 02. ENGINEERING PROJECTS LEDGER ======================== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule-hairline);
}

.filter-btn {
  min-height: 40px;
  padding: 0.35rem 0.85rem;
  font-family: var(--font-sans);
  font-size: var(--text-caption);
  font-weight: 600;
  background-color: var(--bg-ledger);
  color: var(--ink-secondary);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.filter-btn:hover {
  color: var(--ink-primary);
  background-color: var(--bg-ledger-hover);
}

.filter-btn[aria-pressed="true"] {
  background-color: var(--ink-primary);
  color: var(--bg-paper);
}

.projects-ledger {
  display: flex;
  flex-direction: column;
}

.project-entry {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1.25rem;
  padding-block: 1.65rem;
  border-bottom: 1px solid var(--rule-hairline);
}

.project-entry:first-child {
  padding-top: 0.5rem;
}

.project-meta-col {
  grid-column: span 4 / span 4;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.project-index-semester {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.project-supervisor {
  font-size: var(--text-caption);
  color: var(--ink-secondary);
  line-height: 1.45;
}

.project-tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.35rem;
  list-style: none;
}

.project-tool-badge {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 0.18rem 0.5rem;
  background-color: var(--bg-ledger);
  color: var(--ink-primary);
  border-radius: var(--radius-sm);
}

.project-body-col {
  grid-column: span 8 / span 8;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.project-title {
  font-family: var(--font-serif);
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--ink-primary);
  line-height: 1.3;
}

.project-desc {
  font-size: var(--text-body);
  color: var(--ink-secondary);
  max-width: 65ch;
  line-height: 1.6;
}

.project-figure-img {
  margin-top: 0.5rem;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--rule-hairline);
}

/* ======================== 03. EDUCATION, EXPERIENCE & CERTIFICATES ======================== */
.dual-ledger-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
}

.ledger-column {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.ledger-subhead {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: 600;
  color: var(--ink-secondary);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--ink-primary);
}

.timeline-item {
  padding-block: 1rem;
  border-bottom: 1px solid var(--rule-hairline);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.timeline-metric {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: 600;
  background-color: var(--bg-paper);
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--rule-hairline);
  font-variant-numeric: tabular-nums;
}

.timeline-degree {
  font-family: var(--font-serif);
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--ink-primary);
}

.timeline-inst {
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--ink-primary);
}

.timeline-loc {
  font-size: var(--text-caption);
  color: var(--ink-secondary);
}

.timeline-desc {
  font-size: var(--text-body-sm);
  color: var(--ink-secondary);
  margin-top: 0.25rem;
}

/* ======================== 04. SKILLS & LANGUAGES MATRIX ======================== */
.skills-spec-table {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.skill-spec-group {
  background-color: var(--bg-ledger);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.skill-spec-title {
  font-family: var(--font-serif);
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--ink-primary);
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--rule-hairline);
}

.skill-items-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
}

.skill-chip {
  background-color: var(--bg-sheet);
  color: var(--ink-primary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  font-weight: 500;
  box-shadow: 0 1px 2px rgba(24, 24, 22, 0.04);
}

.languages-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1.15rem 1.35rem;
  background-color: var(--bg-ledger);
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: space-between;
}

.lang-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.lang-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--text-h3);
}

.lang-prof {
  font-size: var(--text-body-sm);
  color: var(--ink-secondary);
}

.lang-score {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--accent);
  font-weight: 600;
}

/* ======================== 05. HOBBIES, CREATIVE WRITING & GALLERY ======================== */
.hobbies-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.hobby-sheet {
  background-color: var(--bg-sheet);
  padding: 1.35rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sheet);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.hobby-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.hobby-title {
  font-family: var(--font-serif);
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--ink-primary);
}

.hobby-desc {
  font-size: var(--text-body-sm);
  color: var(--ink-secondary);
  line-height: 1.6;
}

.hobby-img-wrap {
  margin-top: 0.4rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--bg-ledger);
}

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

/* ======================== 06. ACADEMIC REFERENCES & CONTACT FORM ======================== */
.references-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.ref-sheet {
  background-color: var(--bg-ledger);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.ref-rel {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.ref-name {
  font-family: var(--font-serif);
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--ink-primary);
}

.ref-title,
.ref-inst {
  font-size: var(--text-body-sm);
  color: var(--ink-secondary);
}

.ref-email {
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--ink-primary);
  text-decoration: none;
}

.ref-email:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* Contact Inquiry Form */
.inquiry-sheet {
  background-color: var(--bg-ledger);
  padding: clamp(1.35rem, 3vw, 2rem);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-field.span-2 {
  grid-column: span 2 / span 2;
}

.form-field label {
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--ink-primary);
}

.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  min-height: 44px;
  padding: 0.65rem 0.85rem;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  color: var(--ink-primary);
  background-color: var(--bg-sheet);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
}

.form-field textarea {
  min-height: 110px;
  resize: vertical;
}

.status-banner {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.status-banner.success {
  background-color: var(--status-ok-bg);
  color: var(--status-ok-fg);
}

.status-banner.error {
  background-color: var(--status-err-bg);
  color: var(--status-err-fg);
}

/* Footer */
.site-footer {
  padding-block: 2.5rem;
  background-color: var(--bg-paper);
  font-size: var(--text-caption);
  color: var(--ink-secondary);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

/* Native Dialog Modal */
dialog.dossier-dialog {
  margin: auto;
  width: min(92vw, 620px);
  background-color: var(--bg-sheet);
  color: var(--ink-primary);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-modal);
}

dialog.dossier-dialog::backdrop {
  background-color: rgba(24, 24, 22, 0.45);
  backdrop-filter: blur(2px);
}

/* ======================== RESPONSIVE BREAKPOINTS ======================== */
@media (max-width: 960px) {
  .masthead-left,
  .masthead-right,
  .section-index-col,
  .section-content-col {
    grid-column: span 12 / span 12;
  }

  .section-index-col {
    position: static;
    border-bottom: 1px solid var(--rule-hairline);
    padding-bottom: 0.75rem;
  }

  .masthead-left {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
  }

  .portrait-frame {
    max-width: 150px;
  }

  .dossier-coordinates {
    flex: 1;
    min-width: 240px;
  }

  .dual-ledger-grid,
  .research-abstract-grid,
  .skills-spec-table,
  .hobbies-grid,
  .references-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--bg-paper);
    border-bottom: 1px solid var(--rule-hairline);
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem var(--gutter);
    box-shadow: var(--shadow-sheet);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    min-height: 44px;
  }

  .project-meta-col,
  .project-body-col,
  .form-field,
  .form-field.span-2 {
    grid-column: span 12 / span 12;
  }

  .research-metrics-row {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* Print Stylesheet for Official CV Printing */
@media print {
  .site-header,
  .masthead-cta-bar,
  .filter-bar,
  .waveform-controls,
  .inquiry-sheet,
  .site-footer {
    display: none !important;
  }
  body,
  .monograph-section,
  .monograph-section.surface-ledger {
    background: #FFFFFF !important;
    color: #000000 !important;
  }
  .dossier-masthead {
    min-height: auto;
    padding-block: 1rem;
  }
  .monograph-section {
    padding-block: 1.25rem;
    page-break-inside: avoid;
  }
}