/* ==========================================================================
   SERKAN TAŞALAN — ACADEMIC & EDUCATIONAL TECHNOLOGY PORTFOLIO
   Design System: Contemporary Academic Editorial Design
   Typography: Instrument Serif + Inter (Swiss Typographical Precision)
   ========================================================================== */

:root {
  /* Color Palette — Archival & Scholarly */
  --bg: #F7F7F4;
  --surface: #FFFFFF;
  --surface-subtle: #F0F0EB;
  --surface-hover: #EAEAE4;
  --ink: #171717;
  --ink-secondary: #3D3C38;
  --muted: #686660;
  --muted-light: #8E8D87;
  --border: #DDDCD7;
  --border-light: #EBEAE5;
  --border-dark: #C6C5BF;
  
  /* Academic Oxford Accent */
  --accent: #243A73;
  --accent-muted: #EEF2F8;
  --accent-border: #CBD7EB;
  --accent-hover: #192A54;
  
  /* Semantic Status Indicators */
  --tag-teaching-bg: #EEF4F0;
  --tag-teaching-text: #205436;
  --tag-tech-bg: #EEF2F8;
  --tag-tech-text: #1E3A6E;
  --tag-research-bg: #F5EFEB;
  --tag-research-text: #6A3E1E;
  
  /* Typography Tokens */
  --font-serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* Fluid Typographical Scales */
  --text-display: clamp(3rem, 5.8vw, 5.4rem);
  --text-h1: clamp(2.2rem, 4vw, 3.8rem);
  --text-h2: clamp(1.6rem, 2.6vw, 2.6rem);
  --text-h3: clamp(1.25rem, 1.7vw, 1.7rem);
  --text-body-lg: clamp(1.1rem, 1.25vw, 1.22rem);
  --text-body: 1rem;
  --text-sm: 0.84rem;
  --text-xs: 0.72rem;
  
  /* Spacing Scale (4, 8, 12, 16, 24, 32, 48, 64, 96, 128) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 48px;
  --space-9: 64px;
  --space-10: 96px;
  --space-11: 128px;
  
  /* Layout Constraints */
  --measure: 68ch;
  --container-max: 1220px;
  --container-narrow: 840px;
  --container-wide: 1340px;
  
  /* Radius & Subtle Transitions */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.16s;
  --duration-normal: 0.22s;
  
  /* Elevation (Restrained, subtle borders preferred over heavy shadows) */
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.02);
  --shadow-dropdown: 0 12px 36px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  
  color-scheme: light;
}

/* Dark Mode Tokens — Archival Slate */
html[data-theme="dark"] {
  --bg: #131416;
  --surface: #1B1D20;
  --surface-subtle: #23252A;
  --surface-hover: #2B2E35;
  --ink: #ECEBE6;
  --ink-secondary: #C8C7C2;
  --muted: #95948E;
  --muted-light: #706F6A;
  --border: #2A2D32;
  --border-light: #202226;
  --border-dark: #3E4249;
  
  --accent: #8AA9E0;
  --accent-muted: #1B2433;
  --accent-border: #2A3850;
  --accent-hover: #A5C0F0;
  
  --tag-teaching-bg: #162B20;
  --tag-teaching-text: #86D3A0;
  --tag-tech-bg: #182338;
  --tag-tech-text: #9BB8EA;
  --tag-research-bg: #2C211A;
  --tag-research-text: #DDB89A;
  
  --shadow-subtle: 0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-dropdown: 0 16px 48px rgba(0, 0, 0, 0.5), 0 2px 10px rgba(0, 0, 0, 0.3);
  
  color-scheme: dark;
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background-color: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.62;
  color: var(--ink);
  background-color: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6, p, blockquote, figure, ul, ol, dl, dd {
  margin: 0;
  padding: 0;
}

h1, h2, h3, .font-serif {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.12;
  color: var(--ink);
  letter-spacing: -0.015em;
}

p {
  color: var(--ink-secondary);
  line-height: 1.68;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease);
}

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

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 1000;
  background: var(--accent);
  color: #FFFFFF;
  padding: 10px 18px;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--duration-fast) var(--ease);
}

.skip-link:focus {
  top: 16px;
}

/* Global SVG Icons */
.icon {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  stroke-width: 1.7;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.2em;
  flex-shrink: 0;
}

.icon-sm {
  width: 1em;
  height: 1em;
}

/* Utility Containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(16px, 3vw, 36px);
  padding-right: clamp(16px, 3vw, 36px);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(16px, 3vw, 36px);
  padding-right: clamp(16px, 3vw, 36px);
}

/* Editorial Eyebrows */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-3);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 1px;
  background-color: var(--border-dark);
}

/* ==========================================================================
   Header & Navigation (Top Editorial Header)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(247, 247, 244, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--duration-normal) var(--ease), border-color var(--duration-normal) var(--ease);
}

html[data-theme="dark"] .site-header {
  background-color: rgba(19, 20, 22, 0.94);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 24px);
  height: 72px;
}

.brand-group {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 1.8vw, 1.4rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.1;
  text-decoration: none;
  white-space: nowrap;
}

.brand-name:hover {
  color: var(--accent);
}

.brand-role {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* Desktop Navigation */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 24px);
  flex-shrink: 1;
}

.nav-link {
  font-size: clamp(0.85rem, 1.1vw, 0.92rem);
  font-weight: 500;
  color: var(--ink-secondary);
  padding: 6px 2px;
  position: relative;
  white-space: nowrap;
  transition: color var(--duration-fast) var(--ease);
}

.nav-link:hover {
  color: var(--ink);
}

.nav-link.is-active {
  color: var(--accent);
  font-weight: 600;
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 4px;
  right: 4px;
  height: 2px;
  background-color: var(--accent);
  border-radius: 1px;
}

/* Header Action Utilities */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.btn-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  font-size: var(--text-sm);
  color: var(--muted);
  transition: all var(--duration-fast) var(--ease);
}

.btn-search-trigger:hover {
  border-color: var(--border-dark);
  color: var(--ink);
  background-color: var(--surface-hover);
}

.kbd-shortcut {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 5px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background-color: var(--bg);
  color: var(--muted);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--ink-secondary);
  transition: all var(--duration-fast) var(--ease);
}

.icon-btn:hover {
  background-color: var(--surface-hover);
  color: var(--ink);
  border-color: var(--border-dark);
}

.btn-contact-header {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  background-color: var(--accent);
  color: #FFFFFF !important;
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  transition: background-color var(--duration-fast) var(--ease);
}

.btn-contact-header:hover {
  background-color: var(--accent-hover);
}

.btn-mobile-menu {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  color: var(--ink);
}

/* Mobile Drawer Overlay */
.mobile-drawer {
  position: fixed;
  inset: 72px 0 0 0;
  background-color: rgba(19, 20, 22, 0.4);
  backdrop-filter: blur(4px);
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  overflow: hidden;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease), visibility var(--duration-normal) var(--ease);
}

.mobile-drawer:not(.is-open) {
  display: none !important;
}

.mobile-drawer.is-open {
  display: block;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-drawer-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: var(--bg);
  border-left: 1px solid var(--border);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease);
  overflow-y: auto;
}

.mobile-drawer.is-open .mobile-drawer-content {
  transform: translateX(0);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background-color var(--duration-fast) var(--ease);
}

.mobile-nav-link:hover,
.mobile-nav-link.is-active {
  background-color: var(--surface-subtle);
  border-color: var(--border-light);
  color: var(--accent);
}

/* ==========================================================================
   Buttons & Links
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 11px 20px;
  font-size: 0.94rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  line-height: 1.3;
  transition: all var(--duration-fast) var(--ease);
  text-decoration: none;
  max-width: 100%;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--ink);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background-color: var(--surface-hover);
  border-color: var(--border-dark);
  color: var(--ink);
}

.link-editorial {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: all var(--duration-fast) var(--ease);
}

.link-editorial:hover {
  border-bottom-color: var(--accent);
  gap: 9px;
}

/* ==========================================================================
   Hero Section (Contemporary Editorial Composition)
   ========================================================================== */

.editorial-hero {
  padding-top: clamp(40px, 7vw, 84px);
  padding-bottom: clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-heading {
  font-size: var(--text-h1);
  line-height: 1.04;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.hero-heading em {
  font-style: italic;
  font-family: var(--font-serif);
}

.hero-divider {
  display: inline-block;
  color: var(--accent);
  font-style: normal;
  margin: 0 4px;
}

.hero-subtitle {
  font-size: var(--text-body-lg);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink-secondary);
  max-width: 580px;
  margin-bottom: var(--space-6);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

/* Hero Portrait Frame */
.hero-portrait-frame {
  position: relative;
  width: 100%;
  max-width: 440px;
  margin-left: auto;
}

.hero-portrait-wrapper {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background-color: var(--surface-subtle);
  box-shadow: var(--shadow-subtle);
}

.hero-portrait-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  transition: transform 0.4s var(--ease);
}

.hero-portrait-caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: var(--space-2);
}

/* ==========================================================================
   Credential Layer (Clean Academic Strip)
   ========================================================================== */

.credential-strip {
  border-bottom: 1px solid var(--border);
  background-color: var(--surface);
  transition: background-color var(--duration-normal) var(--ease);
}

.credential-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  divide-x: 1px solid var(--border);
}

.credential-item {
  padding: var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-right: 1px solid var(--border);
}

.credential-item:last-child {
  border-right: none;
}

.credential-metric {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.credential-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.credential-desc {
  font-size: 0.82rem;
  color: var(--ink-secondary);
  margin-top: 2px;
}

/* ==========================================================================
   Section Components
   ========================================================================== */

.section {
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--border);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: clamp(32px, 5vw, 56px);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-light);
}

.section-title {
  font-size: var(--text-h2);
  line-height: 1.15;
}

.section-summary {
  font-size: 1.02rem;
  color: var(--muted);
  max-width: 580px;
  margin-top: var(--space-2);
}

/* ==========================================================================
   Selected Work (Editorial Project Rows)
   ========================================================================== */

.selected-work-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.editorial-project-row {
  display: grid;
  grid-template-columns: 80px 1.4fr 1.6fr 140px;
  gap: var(--space-6);
  padding: clamp(24px, 3.5vw, 36px) 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
  text-decoration: none;
  color: inherit;
  transition: background-color var(--duration-fast) var(--ease), padding-left var(--duration-fast) var(--ease);
}

.editorial-project-row:hover {
  background-color: var(--surface-subtle);
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}

.project-number {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-style: italic;
  color: var(--muted-light);
  line-height: 1;
}

.editorial-project-row:hover .project-number {
  color: var(--accent);
}

.project-identity {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.project-title {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.2;
}

.editorial-project-row:hover .project-title {
  color: var(--accent);
}

.project-discipline {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
}

.project-narrative {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-synopsis {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--ink-secondary);
}

.project-specs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag-spec {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-xs);
  font-weight: 500;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  background-color: var(--surface);
  border: 1px solid var(--border-light);
  color: var(--ink-secondary);
}

.project-action-cell {
  text-align: right;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  transition: gap var(--duration-fast) var(--ease);
}

.editorial-project-row:hover .project-action-cell {
  gap: 10px;
}

/* ==========================================================================
   Teaching & Research Synthesis (Editorial 2-Column)
   ========================================================================== */

.teaching-research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
}

.teaching-research-grid.teaching-grid-3col {
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 1024px) {
  .teaching-research-grid.teaching-grid-3col {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

.academic-column {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: clamp(28px, 4vw, 44px);
  background-color: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  transition: border-color var(--duration-fast) var(--ease);
}

.academic-column:hover {
  border-color: var(--accent-border);
}

.academic-column-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.academic-column-title {
  font-size: 1.85rem;
  line-height: 1.15;
}

.academic-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.academic-list-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-secondary);
}

.academic-list-item strong {
  color: var(--ink);
  font-weight: 600;
}

.bullet-accent {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent);
  margin-top: 8px;
  flex-shrink: 0;
}

/* ==========================================================================
   Featured Resources (Editorial Directory Cards)
   ========================================================================== */

.resources-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.resource-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--surface);
  text-decoration: none;
  color: inherit;
  transition: all var(--duration-fast) var(--ease);
}

.resource-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-subtle);
}

.resource-card-top {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.resource-tag {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  background-color: var(--accent-muted);
  color: var(--accent);
}

.resource-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.25;
  color: var(--ink);
}

.resource-card:hover .resource-title {
  color: var(--accent);
}

.resource-desc {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
  margin-top: 4px;
}

.resource-action {
  margin-top: var(--space-5);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-top: 1px solid var(--border-light);
  padding-top: var(--space-3);
}

/* ==========================================================================
   Academic Timeline (About Page & Preview)
   ========================================================================== */

.timeline {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  margin-left: 8px;
  padding-left: var(--space-6);
  gap: var(--space-7);
}

.timeline-entry {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.timeline-entry::before {
  content: "";
  position: absolute;
  left: calc(var(--space-6) * -1 - 5px);
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--surface);
  border: 2px solid var(--accent);
}

.timeline-period {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.timeline-role {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--ink);
}

.timeline-institution {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--accent);
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--ink-secondary);
  line-height: 1.6;
  margin-top: 4px;
}

/* ==========================================================================
   Full View Architecture (Single Page Routing Container)
   ========================================================================== */

.view-section {
  animation: fadeIn var(--duration-normal) var(--ease);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.view-header {
  padding-top: clamp(36px, 5vw, 64px);
  padding-bottom: clamp(32px, 4vw, 48px);
  border-bottom: 1px solid var(--border);
  background-color: var(--surface);
  transition: background-color var(--duration-normal) var(--ease);
}

.view-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.btn-back-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink);
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--bg);
  transition: all var(--duration-fast) var(--ease);
}

.btn-back-home:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--muted);
}

.crumb-sep {
  color: var(--border-dark);
}

.crumb-active {
  color: var(--ink);
  font-weight: 500;
}

.view-title {
  font-size: var(--text-h1);
  line-height: 1.08;
  margin-bottom: var(--space-3);
}

.view-description {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--muted);
  max-width: 720px;
}

.view-body {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(64px, 8vw, 112px);
}

/* ==========================================================================
   Case Study View Layout
   ========================================================================== */

.case-study-hero {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  align-items: start;
}

.case-study-metadata-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.metadata-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metadata-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.metadata-value {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink);
}

.case-study-article {
  max-width: var(--measure);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-secondary);
}

.case-study-article h2 {
  font-size: 1.8rem;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border-light);
}

.case-study-article h3 {
  font-size: 1.35rem;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

.case-study-article p {
  margin-bottom: var(--space-4);
}

.case-study-article ul, .case-study-article ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-5);
}

.case-study-article li {
  margin-bottom: var(--space-2);
}

.pedagogical-callout {
  background-color: var(--accent-muted);
  border-left: 3px solid var(--accent);
  padding: var(--space-5) var(--space-6);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: var(--space-6) 0;
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--ink);
}

.pedagogical-callout strong {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 4px;
}

/* ==========================================================================
   Project Filters (Only on Projects Page)
   ========================================================================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-light);
}

.filter-btn {
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--muted);
  transition: all var(--duration-fast) var(--ease);
}

.filter-btn:hover {
  color: var(--ink);
  border-color: var(--border-dark);
}

.filter-btn.is-active {
  background-color: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
}

/* ==========================================================================
   Search Dialog (Accessible Modal)
   ========================================================================== */

.search-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--surface);
  color: var(--ink);
  width: min(640px, calc(100% - 32px));
  max-height: 80vh;
  padding: 0;
  box-shadow: var(--shadow-dropdown);
  overflow: hidden;
}

.search-dialog::backdrop {
  background-color: rgba(19, 20, 22, 0.5);
  backdrop-filter: blur(4px);
}

.search-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background-color: var(--bg);
}

.search-input-field {
  width: 100%;
  border: none;
  background: none;
  font-size: 1.1rem;
  color: var(--ink);
  outline: none;
}

.search-results-container {
  max-height: 50vh;
  overflow-y: auto;
  padding: var(--space-3) var(--space-2);
}

.search-group-heading {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: var(--space-3) var(--space-4) var(--space-1);
}

.search-result-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: background-color var(--duration-fast) var(--ease);
}

.search-result-item:hover,
.search-result-item.is-selected {
  background-color: var(--surface-subtle);
}

.search-result-item strong {
  display: block;
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--ink);
}

.search-result-item small {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 2px;
}

.search-empty-state {
  padding: var(--space-7) var(--space-5);
  text-align: center;
  color: var(--muted);
  font-size: 0.94rem;
}

.search-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--border);
  background-color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--muted);
}

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

.site-footer {
  margin-top: auto;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  padding-top: clamp(48px, 6vw, 72px);
  padding-bottom: clamp(36px, 4vw, 48px);
  font-size: var(--text-sm);
  transition: background-color var(--duration-normal) var(--ease);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-brand-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--ink);
}

.footer-brand-subtitle {
  font-size: 0.85rem;
  color: var(--muted);
  max-width: 320px;
  line-height: 1.5;
}

.footer-col-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: var(--ink-secondary);
  transition: color var(--duration-fast) var(--ease);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-light);
  color: var(--muted);
  font-size: var(--text-xs);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-7);
  }
  
  .hero-portrait-frame {
    max-width: 360px;
    margin: 0 auto;
  }
  
  .credential-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .credential-item:nth-child(2) {
    border-right: none;
  }
  
  .credential-item:nth-child(1),
  .credential-item:nth-child(2) {
    border-bottom: 1px solid var(--border);
  }
  
  .editorial-project-row {
    grid-template-columns: 60px 1.2fr 1.6fr;
  }
  
  .project-action-cell {
    display: none;
  }
  
  .teaching-research-grid {
    grid-template-columns: 1fr;
  }
  
  .resources-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }

  .case-study-hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1200px) {
  .brand-role {
    display: none;
  }
}

@media (max-width: 1060px) {
  .desktop-nav {
    display: none;
  }
  
  .btn-mobile-menu {
    display: inline-flex;
  }
}

@media (max-width: 840px) {
  .btn-search-trigger .kbd-shortcut {
    display: none;
  }
}

@media (max-width: 640px) {
  .btn-contact-header {
    display: none;
  }
  
  .btn-search-trigger span {
    display: none;
  }
  
  .btn-search-trigger {
    padding: 7px 10px;
  }

  .editorial-hero {
    padding-top: var(--space-6);
    padding-bottom: var(--space-7);
  }
  
  .credential-grid {
    grid-template-columns: 1fr;
  }
  
  .credential-item {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: var(--space-4) var(--space-4);
  }
  
  .credential-item:last-child {
    border-bottom: none;
  }
  
  .editorial-project-row {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    padding: var(--space-5) 0;
  }
  
  .project-number {
    font-size: 1.2rem;
  }
  
  .resources-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

/* Reduced Motion Override */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}