/* ============================================================
   M3-Inspired Design Tokens — Teal/Slate Palette
   ============================================================ */

:root {
  /* Primary — teal */
  --md-primary: #2a7d78;
  --md-on-primary: #ffffff;
  --md-primary-container: #b2dfdb;
  --md-on-primary-container: #00201f;

  /* Secondary — slate */
  --md-secondary: #4a6572;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #cddae2;
  --md-on-secondary-container: #061e27;

  /* Surface */
  --md-surface: #f4f6f7;
  --md-surface-variant: #e8edef;
  --md-on-surface: #191c1c;
  --md-on-surface-variant: #3f4948;

  /* Background */
  --md-background: #f4f6f7;
  --md-on-background: #191c1c;

  /* Outline */
  --md-outline: #6f797a;
  --md-outline-variant: #bec8c9;

  /* Elevation shadows */
  --md-shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  --md-shadow-2: 0 3px 6px rgba(0,0,0,0.12), 0 2px 4px rgba(0,0,0,0.08);
  --md-shadow-3: 0 6px 16px rgba(0,0,0,0.12), 0 3px 6px rgba(0,0,0,0.08);

  /* Typography scale (M3-inspired) */
  --md-font-display: clamp(2rem, 5vw, 3rem);
  --md-font-headline: clamp(1.4rem, 3vw, 1.875rem);
  --md-font-title: 1.25rem;
  --md-font-body: 1rem;
  --md-font-label: 0.875rem;

  /* Border radii */
  --md-radius-sm: 8px;
  --md-radius-md: 12px;
  --md-radius-lg: 16px;
  --md-radius-xl: 28px;
  --md-radius-full: 9999px;
}

/* ============================================================
   Dark Mode Overrides
   Auto: follows system preference unless manually overridden.
   Manual force-dark: html[data-theme="dark"]
   Manual force-light: html[data-theme="light"] suppresses the media query below.
   ============================================================ */

/* System dark, no manual override */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --md-primary: #80cbc4;
    --md-on-primary: #00201f;
    --md-primary-container: #00504d;
    --md-on-primary-container: #b2dfdb;

    --md-secondary: #a0bec8;
    --md-on-secondary: #0a2d3a;
    --md-secondary-container: #1e4558;
    --md-on-secondary-container: #cddae2;

    --md-surface: #191c1c;
    --md-surface-variant: #222829;
    --md-on-surface: #e1e3e3;
    --md-on-surface-variant: #bec8c9;

    --md-background: #101414;
    --md-on-background: #e1e3e3;

    --md-outline: #889393;
    --md-outline-variant: #3f4948;

    --md-shadow-1: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --md-shadow-2: 0 3px 6px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
    --md-shadow-3: 0 6px 16px rgba(0,0,0,0.5), 0 3px 6px rgba(0,0,0,0.3);
  }
}

/* Manual force-dark (overrides system light) */
html[data-theme="dark"] {
    --md-primary: #80cbc4;
    --md-on-primary: #00201f;
    --md-primary-container: #00504d;
    --md-on-primary-container: #b2dfdb;

    --md-secondary: #a0bec8;
    --md-on-secondary: #0a2d3a;
    --md-secondary-container: #1e4558;
    --md-on-secondary-container: #cddae2;

    --md-surface: #191c1c;
    --md-surface-variant: #222829;
    --md-on-surface: #e1e3e3;
    --md-on-surface-variant: #bec8c9;

    --md-background: #101414;
    --md-on-background: #e1e3e3;

    --md-outline: #889393;
    --md-outline-variant: #3f4948;

  --md-shadow-1: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --md-shadow-2: 0 3px 6px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
  --md-shadow-3: 0 6px 16px rgba(0,0,0,0.5), 0 3px 6px rgba(0,0,0,0.3);
}

/* ============================================================
   Base
   ============================================================ */

html {
  scroll-behavior: smooth;
  background-color: var(--md-background);
  color: var(--md-on-background);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: var(--md-font-body);
  line-height: 1.6;
}

body {
  background-color: var(--md-background);
  color: var(--md-on-background);
  margin: 0;
  padding: 0;
}

/* ============================================================
   Profile Photo Circle
   ============================================================ */

.profile-photo {
  width: 128px;
  height: 128px;
  border-radius: var(--md-radius-full);
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: var(--md-shadow-2);
  flex-shrink: 0;
  overflow: hidden;
  border: 3px solid var(--md-outline-variant);
}

.profile-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
   Cards / Surfaces
   ============================================================ */

.md-card {
  background-color: var(--md-surface);
  border-radius: var(--md-radius-lg);
  box-shadow: var(--md-shadow-1);
  border: 1px solid var(--md-outline-variant);
  padding: 1.5rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.md-card:hover {
  box-shadow: var(--md-shadow-2);
  transform: translateY(-1px);
}

/* ============================================================
   Year Chips / Badges
   ============================================================ */

.year-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  border-radius: var(--md-radius-full);
  font-size: var(--md-font-label);
  font-weight: 500;
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  line-height: 1.4;
  white-space: nowrap;
}

.year-chip-primary {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

/* ============================================================
   Affiliation Badges
   ============================================================ */

.affil-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.85rem;
  border-radius: var(--md-radius-full);
  font-size: var(--md-font-label);
  font-weight: 500;
  background-color: var(--md-surface);
  color: var(--md-primary);
  border: 1.5px solid var(--md-primary);
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.affil-badge:hover {
  background-color: var(--md-primary);
  color: var(--md-on-primary);
}

/* ============================================================
   Icon Links
   ============================================================ */

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--md-radius-full);
  color: var(--md-on-surface-variant);
  background-color: transparent;
  transition: background-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
}

.icon-link:hover {
  background-color: var(--md-surface-variant);
  color: var(--md-primary);
}

/* ============================================================
   Scroll-Reveal Animation
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: none; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.10s; opacity: 1; transform: none; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.15s; opacity: 1; transform: none; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.20s; opacity: 1; transform: none; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.25s; opacity: 1; transform: none; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.30s; opacity: 1; transform: none; }
.reveal-stagger.visible > *:nth-child(n+7) { transition-delay: 0.35s; opacity: 1; transform: none; }

/* ============================================================
   Sticky Header
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: color-mix(in srgb, var(--md-surface) 80%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--md-outline-variant);
}

/* ============================================================
   Section Headings
   ============================================================ */

.section-title {
  font-size: var(--md-font-headline);
  font-weight: 600;
  color: var(--md-primary);
  margin-bottom: 0.25rem;
}

.section-divider {
  height: 2px;
  background: linear-gradient(90deg, var(--md-primary) 0%, transparent 100%);
  border: none;
  margin-bottom: 1.75rem;
  border-radius: var(--md-radius-full);
  max-width: 120px;
}

/* ============================================================
   Academic Services list
   ============================================================ */

.service-list {
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-radius-lg);
  overflow: hidden;
}

.service-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--md-outline-variant);
  transition: background-color 0.15s ease;
}

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

.service-row:hover {
  background-color: var(--md-surface-variant);
}

@media (min-width: 640px) {
  .service-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }
}

/* ============================================================
   Reviewer Timeline Chart
   ============================================================ */

/* ============================================================
   Reviewer stacked bar chart — conference colors
   ============================================================ */

:root {
  --rv-chi:     #2a7d78;
  --rv-chiplay: #b05c2a;
  --rv-ieeevr:  #6b3fa0;
  --rv-sui:     #1565c0;
  --rv-muc:     #2e7d32;
  --rv-gamifin: #a0522d;
  --rv-sportshci: #c2185b;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --rv-chi:     #80cbc4;
    --rv-chiplay: #f4956c;
    --rv-ieeevr:  #b39ddb;
    --rv-sui:     #82b1ff;
    --rv-muc:     #a5d6a7;
    --rv-gamifin: #d4a574;
    --rv-sportshci: #f48fb1;
  }
}

html[data-theme="dark"] {
  --rv-chi:     #80cbc4;
  --rv-chiplay: #f4956c;
  --rv-ieeevr:  #b39ddb;
  --rv-sui:     #82b1ff;
  --rv-muc:     #a5d6a7;
  --rv-gamifin: #d4a574;
  --rv-sportshci: #f48fb1;
}

/* Conference reviewer cards */
.rv-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(145px, 1fr));
  gap: 0.6rem;
  margin-bottom: 0.25rem;
}

.rv-card {
  padding: 0.65rem 0.75rem;
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
}

.rv-card-name {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin-bottom: 0.4rem;
}

.rv-card-years {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.rv-year-badge {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--md-on-surface-variant);
  background-color: var(--md-surface-variant);
  border: 1px solid var(--md-outline-variant);
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  line-height: 1.2;
}

/* Chart toggle button */
.rv-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--md-primary);
  background: transparent;
  border: 1px solid var(--md-primary);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
  font-family: inherit;
}

.rv-toggle-btn:hover {
  background-color: color-mix(in srgb, var(--md-primary) 10%, transparent);
}

.rv-toggle-btn[aria-expanded="true"] {
  background-color: var(--md-primary);
  color: var(--md-surface);
}

/* Expandable chart panel */
.rv-chart-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s ease;
}

.rv-chart-panel.is-open {
  max-height: 500px;
}

.rv-wrapper {
  padding: 0.75rem 0 0.25rem;
}

.rv-svg {
  width: 100%;
  height: auto;
  overflow: visible;
  font-family: inherit;
}

.rv-grid {
  stroke: var(--md-outline-variant);
  stroke-width: 1;
  stroke-dasharray: 4 3;
}

.rv-axis-line {
  stroke: var(--md-outline-variant);
  stroke-width: 1.5;
}

.rv-label {
  font-size: 10px;
  fill: var(--md-on-surface-variant);
  text-anchor: middle;
}

.rv-label-r {
  text-anchor: end;
}

.rv-val {
  font-size: 10px;
  font-weight: 700;
  fill: var(--md-on-surface-variant);
  text-anchor: middle;
  opacity: 0;
  transition: opacity 0.3s ease 0.5s;
}

.rv-wrapper.visible .rv-val {
  opacity: 1;
}

/* Bars */
.rv-bar {
  opacity: 0;
  transition: opacity 0.45s ease 0.15s;
}

.rv-wrapper.visible .rv-bar {
  opacity: 1;
}

.rv-bar-chi      { fill: var(--rv-chi); }
.rv-bar-chiplay  { fill: var(--rv-chiplay); }
.rv-bar-ieeevr   { fill: var(--rv-ieeevr); }
.rv-bar-sui      { fill: var(--rv-sui); }
.rv-bar-muc      { fill: var(--rv-muc); }
.rv-bar-gamifin  { fill: var(--rv-gamifin); }
.rv-bar-sportshci { fill: var(--rv-sportshci); }

/* Legend */
.rv-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  justify-content: center;
  margin-top: 0.5rem;
  padding: 0 0.5rem;
}

.rv-legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  color: var(--md-on-surface-variant);
}

.rv-swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.rv-swatch-chi       { background-color: var(--rv-chi); }
.rv-swatch-chiplay   { background-color: var(--rv-chiplay); }
.rv-swatch-ieeevr    { background-color: var(--rv-ieeevr); }
.rv-swatch-sui       { background-color: var(--rv-sui); }
.rv-swatch-muc       { background-color: var(--rv-muc); }
.rv-swatch-gamifin   { background-color: var(--rv-gamifin); }
.rv-swatch-sportshci { background-color: var(--rv-sportshci); }

/* ============================================================
   Publication entries
   ============================================================ */

.pub-entry {
  padding: 1rem 1.25rem;
  border-radius: var(--md-radius-md);
  background-color: var(--md-surface);
  border-left: 3px solid var(--md-primary-container);
  margin-bottom: 0.75rem;
  transition: border-left-color 0.15s ease;
}

.pub-entry:hover {
  border-left-color: var(--md-primary);
}

.pub-entry a {
  color: var(--md-primary);
  text-decoration: none;
  font-weight: 500;
}

.pub-entry a:hover {
  text-decoration: underline;
}

.pub-year {
  font-size: var(--md-font-label);
  font-weight: 600;
  color: var(--md-secondary);
  margin-bottom: 0.2rem;
}

/* ============================================================
   Research Interest Chips
   ============================================================ */

.interest-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.8rem;
  border-radius: var(--md-radius-full);
  font-size: var(--md-font-label);
  font-weight: 500;
  background-color: var(--md-surface-variant);
  color: var(--md-on-surface-variant);
  border: 1px solid var(--md-outline-variant);
  user-select: none;
}

/* ============================================================
   Publication expand/collapse
   ============================================================ */

.pub-extra-wrap {
  transition: max-height 0.45s ease-out;
}

.pub-chevron {
  transition: transform 0.25s ease;
}

/* ============================================================
   Steam Gaming Stats Widget
   ============================================================ */

/* Games chip — interactive variant */
.games-chip {
  border-color: var(--md-primary);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.games-chip.active {
  background-color: var(--md-primary);
  color: var(--md-on-primary);
  border-color: var(--md-primary);
}

/* Steam inline panel — expands below chip row in document flow */
.steam-popover {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.steam-popover.is-open {
  grid-template-rows: 1fr;
}

/* Direct child is the grid item — overflow:hidden enables the row collapse trick */
.steam-popover > div {
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.steam-popover.is-open > div {
  opacity: 1;
  transition: opacity 0.3s ease 0.1s;
}

.steam-game-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--md-outline-variant);
}

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

.steam-capsule {
  width: 60px;
  height: 28px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
  background-color: var(--md-surface-variant);
}

/* ============================================================
   Typewriter cursor
   ============================================================ */

.typewriter-cursor {
  display: inline-block;
  color: var(--md-primary);
  font-weight: 300;
  margin-left: 1px;
  animation: tw-blink 0.85s step-end infinite;
}

@keyframes tw-blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}