@import url("https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Space+Grotesk:wght@400;500;600&display=swap");

:root {
  color-scheme: light;
  --bg-start: #fbfcfe;
  --bg: #f6f7f9;
  --bg-2: #edf1f6;
  --ink: #0f172a;
  --muted: #5b6875;
  --accent: #2563eb;
  --accent-2: #0f766e;
  --card: #ffffff;
  --card-raised: #ffffff;
  --line: #e1e6ee;
  --shadow: 0 14px 34px rgba(9, 18, 30, 0.08);
  --dot: rgba(15, 23, 42, 0.06);
  --bg-orb-a: rgba(37, 99, 235, 0.18);
  --bg-orb-b: rgba(15, 118, 110, 0.14);
  --bg-orb-c: rgba(15, 23, 42, 0.04);
  --grain-opacity: 0.24;
  --header-bg: rgba(251, 252, 254, 0.85);
  --header-line: rgba(225, 230, 238, 0.8);
  --header-shadow: 0 8px 26px rgba(9, 18, 30, 0.08);
  --control-bg: rgba(255, 255, 255, 0.9);
  --button-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(245, 248, 253, 0.93) 100%);
  --button-hover-bg: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.98) 0%,
    rgba(238, 245, 255, 0.96) 100%
  );
  --card-soft: linear-gradient(180deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.96) 100%);
  --card-highlight: rgba(255, 255, 255, 0.72);
  --card-hover-border: rgba(37, 99, 235, 0.34);
  --card-hover-shadow: 0 16px 36px rgba(9, 18, 30, 0.14);
  --nav-pill-bg: rgba(255, 255, 255, 0.58);
  --nav-pill-border: rgba(225, 230, 238, 0.92);
  --nav-active-bg: rgba(37, 99, 235, 0.14);
  --nav-active-border: rgba(37, 99, 235, 0.38);
  --nav-active-ink: #1d4ed8;
  --ring-soft: 0 0 0 1px rgba(255, 255, 255, 0.55) inset;
  --surface-soft: rgba(15, 23, 42, 0.02);
  --row-muted-bg: rgba(15, 23, 42, 0.03);
  --row-ended-bg: rgba(15, 23, 42, 0.015);
  --footer-bg: rgba(251, 252, 254, 0.7);
  --footer-line: rgba(215, 222, 230, 0.8);
  --elev-shadow: 0 12px 26px rgba(9, 18, 30, 0.06);
  --hover-shadow: 0 8px 18px rgba(37, 99, 235, 0.12);
  --focus-ring: rgba(37, 99, 235, 0.45);
  --accent-chip-bg: rgba(37, 99, 235, 0.08);
  --accent-chip-border: rgba(37, 99, 235, 0.18);
  --accent-active-bg: rgba(37, 99, 235, 0.1);
  --accent-active-border: rgba(37, 99, 235, 0.4);
  --tag-lead-ink: #1d4ed8;
  --tag-lead-bg: rgba(29, 78, 216, 0.12);
  --tag-lead-border: rgba(29, 78, 216, 0.25);
  --tag-corresponding-ink: #0f766e;
  --tag-corresponding-bg: rgba(15, 118, 110, 0.12);
  --tag-corresponding-border: rgba(15, 118, 110, 0.25);
  --tag-last-ink: #7c3aed;
  --tag-last-bg: rgba(124, 58, 237, 0.12);
  --tag-last-border: rgba(124, 58, 237, 0.25);
  --tag-peer-ink: #b45309;
  --tag-peer-bg: rgba(180, 83, 9, 0.12);
  --tag-peer-border: rgba(180, 83, 9, 0.25);
  --tag-presenter-lead-ink: #2563eb;
  --tag-presenter-lead-bg: rgba(37, 99, 235, 0.12);
  --tag-presenter-lead-border: rgba(37, 99, 235, 0.25);
  --tag-presenter-co-ink: #475569;
  --tag-presenter-co-bg: rgba(71, 85, 105, 0.12);
  --tag-presenter-co-border: rgba(71, 85, 105, 0.25);
  --tag-oral-ink: #1e40af;
  --tag-oral-bg: rgba(30, 64, 175, 0.12);
  --tag-oral-border: rgba(30, 64, 175, 0.25);
  --tag-poster-ink: #0f766e;
  --tag-poster-bg: rgba(15, 118, 110, 0.12);
  --tag-poster-border: rgba(15, 118, 110, 0.25);
  --tag-invited-ink: #9333ea;
  --tag-invited-bg: rgba(147, 51, 234, 0.12);
  --tag-invited-border: rgba(147, 51, 234, 0.25);
  --sans: "Space Grotesk", "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;
  --research-serif: "Hiragino Mincho ProN", "Yu Mincho", "Times New Roman", "Times", serif;
  --jp-round: "Hiragino Maru Gothic ProN", "Hiragino Maru Gothic Pro", "HGMaruGothicMPRO",
    "Yu Gothic", "Meiryo", "Noto Sans JP", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg-start: #050b16;
  --bg: #0b1322;
  --bg-2: #101b31;
  --ink: #e5edf8;
  --muted: #9aaac0;
  --accent: #60a5fa;
  --accent-2: #2dd4bf;
  --card: #131f35;
  --card-raised: #182640;
  --line: #2a3953;
  --shadow: 0 18px 34px rgba(2, 6, 16, 0.48);
  --dot: rgba(148, 163, 184, 0.14);
  --bg-orb-a: rgba(96, 165, 250, 0.24);
  --bg-orb-b: rgba(45, 212, 191, 0.2);
  --bg-orb-c: rgba(148, 163, 184, 0.1);
  --grain-opacity: 0.26;
  --header-bg: rgba(5, 11, 22, 0.82);
  --header-line: rgba(42, 57, 83, 0.82);
  --header-shadow: 0 12px 30px rgba(2, 6, 16, 0.58);
  --control-bg: rgba(19, 31, 53, 0.9);
  --button-bg: linear-gradient(180deg, rgba(24, 38, 64, 0.9) 0%, rgba(18, 29, 50, 0.96) 100%);
  --button-hover-bg: linear-gradient(180deg, rgba(31, 50, 84, 0.92) 0%, rgba(24, 38, 64, 0.98) 100%);
  --card-soft: linear-gradient(180deg, rgba(24, 38, 64, 0.88) 0%, rgba(19, 31, 53, 0.96) 100%);
  --card-highlight: rgba(148, 163, 184, 0.2);
  --card-hover-border: rgba(96, 165, 250, 0.5);
  --card-hover-shadow: 0 18px 40px rgba(2, 6, 16, 0.6);
  --nav-pill-bg: rgba(24, 38, 64, 0.74);
  --nav-pill-border: rgba(42, 57, 83, 0.96);
  --nav-active-bg: rgba(96, 165, 250, 0.2);
  --nav-active-border: rgba(96, 165, 250, 0.48);
  --nav-active-ink: #bfdbfe;
  --ring-soft: 0 0 0 1px rgba(148, 163, 184, 0.2) inset;
  --surface-soft: rgba(148, 163, 184, 0.08);
  --row-muted-bg: rgba(148, 163, 184, 0.14);
  --row-ended-bg: rgba(148, 163, 184, 0.1);
  --footer-bg: rgba(5, 11, 22, 0.74);
  --footer-line: rgba(42, 57, 83, 0.82);
  --elev-shadow: 0 14px 30px rgba(2, 6, 16, 0.45);
  --hover-shadow: 0 10px 20px rgba(96, 165, 250, 0.2);
  --focus-ring: rgba(96, 165, 250, 0.55);
  --accent-chip-bg: rgba(96, 165, 250, 0.16);
  --accent-chip-border: rgba(96, 165, 250, 0.34);
  --accent-active-bg: rgba(96, 165, 250, 0.22);
  --accent-active-border: rgba(96, 165, 250, 0.45);
  --tag-lead-ink: #93c5fd;
  --tag-lead-bg: rgba(147, 197, 253, 0.16);
  --tag-lead-border: rgba(147, 197, 253, 0.34);
  --tag-corresponding-ink: #5eead4;
  --tag-corresponding-bg: rgba(94, 234, 212, 0.16);
  --tag-corresponding-border: rgba(94, 234, 212, 0.34);
  --tag-last-ink: #c4b5fd;
  --tag-last-bg: rgba(196, 181, 253, 0.16);
  --tag-last-border: rgba(196, 181, 253, 0.34);
  --tag-peer-ink: #fdba74;
  --tag-peer-bg: rgba(253, 186, 116, 0.16);
  --tag-peer-border: rgba(253, 186, 116, 0.34);
  --tag-presenter-lead-ink: #93c5fd;
  --tag-presenter-lead-bg: rgba(147, 197, 253, 0.16);
  --tag-presenter-lead-border: rgba(147, 197, 253, 0.34);
  --tag-presenter-co-ink: #cbd5e1;
  --tag-presenter-co-bg: rgba(203, 213, 225, 0.14);
  --tag-presenter-co-border: rgba(203, 213, 225, 0.3);
  --tag-oral-ink: #bfdbfe;
  --tag-oral-bg: rgba(191, 219, 254, 0.16);
  --tag-oral-border: rgba(191, 219, 254, 0.34);
  --tag-poster-ink: #5eead4;
  --tag-poster-bg: rgba(94, 234, 212, 0.16);
  --tag-poster-border: rgba(94, 234, 212, 0.34);
  --tag-invited-ink: #d8b4fe;
  --tag-invited-bg: rgba(216, 180, 254, 0.16);
  --tag-invited-border: rgba(216, 180, 254, 0.34);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg-start: #050b16;
    --bg: #0b1322;
    --bg-2: #101b31;
    --ink: #e5edf8;
    --muted: #9aaac0;
    --accent: #60a5fa;
    --accent-2: #2dd4bf;
    --card: #131f35;
    --card-raised: #182640;
    --line: #2a3953;
    --shadow: 0 18px 34px rgba(2, 6, 16, 0.48);
    --dot: rgba(148, 163, 184, 0.14);
    --bg-orb-a: rgba(96, 165, 250, 0.24);
    --bg-orb-b: rgba(45, 212, 191, 0.2);
    --bg-orb-c: rgba(148, 163, 184, 0.1);
    --grain-opacity: 0.26;
    --header-bg: rgba(5, 11, 22, 0.82);
    --header-line: rgba(42, 57, 83, 0.82);
    --header-shadow: 0 12px 30px rgba(2, 6, 16, 0.58);
    --control-bg: rgba(19, 31, 53, 0.9);
    --button-bg: linear-gradient(180deg, rgba(24, 38, 64, 0.9) 0%, rgba(18, 29, 50, 0.96) 100%);
    --button-hover-bg: linear-gradient(180deg, rgba(31, 50, 84, 0.92) 0%, rgba(24, 38, 64, 0.98) 100%);
    --card-soft: linear-gradient(180deg, rgba(24, 38, 64, 0.88) 0%, rgba(19, 31, 53, 0.96) 100%);
    --card-highlight: rgba(148, 163, 184, 0.2);
    --card-hover-border: rgba(96, 165, 250, 0.5);
    --card-hover-shadow: 0 18px 40px rgba(2, 6, 16, 0.6);
    --nav-pill-bg: rgba(24, 38, 64, 0.74);
    --nav-pill-border: rgba(42, 57, 83, 0.96);
    --nav-active-bg: rgba(96, 165, 250, 0.2);
    --nav-active-border: rgba(96, 165, 250, 0.48);
    --nav-active-ink: #bfdbfe;
    --ring-soft: 0 0 0 1px rgba(148, 163, 184, 0.2) inset;
    --surface-soft: rgba(148, 163, 184, 0.08);
    --row-muted-bg: rgba(148, 163, 184, 0.14);
    --row-ended-bg: rgba(148, 163, 184, 0.1);
    --footer-bg: rgba(5, 11, 22, 0.74);
    --footer-line: rgba(42, 57, 83, 0.82);
    --elev-shadow: 0 14px 30px rgba(2, 6, 16, 0.45);
    --hover-shadow: 0 10px 20px rgba(96, 165, 250, 0.2);
    --focus-ring: rgba(96, 165, 250, 0.55);
    --accent-chip-bg: rgba(96, 165, 250, 0.16);
    --accent-chip-border: rgba(96, 165, 250, 0.34);
    --accent-active-bg: rgba(96, 165, 250, 0.22);
    --accent-active-border: rgba(96, 165, 250, 0.45);
    --tag-lead-ink: #93c5fd;
    --tag-lead-bg: rgba(147, 197, 253, 0.16);
    --tag-lead-border: rgba(147, 197, 253, 0.34);
    --tag-corresponding-ink: #5eead4;
    --tag-corresponding-bg: rgba(94, 234, 212, 0.16);
    --tag-corresponding-border: rgba(94, 234, 212, 0.34);
    --tag-last-ink: #c4b5fd;
    --tag-last-bg: rgba(196, 181, 253, 0.16);
    --tag-last-border: rgba(196, 181, 253, 0.34);
    --tag-peer-ink: #fdba74;
    --tag-peer-bg: rgba(253, 186, 116, 0.16);
    --tag-peer-border: rgba(253, 186, 116, 0.34);
    --tag-presenter-lead-ink: #93c5fd;
    --tag-presenter-lead-bg: rgba(147, 197, 253, 0.16);
    --tag-presenter-lead-border: rgba(147, 197, 253, 0.34);
    --tag-presenter-co-ink: #cbd5e1;
    --tag-presenter-co-bg: rgba(203, 213, 225, 0.14);
    --tag-presenter-co-border: rgba(203, 213, 225, 0.3);
    --tag-oral-ink: #bfdbfe;
    --tag-oral-bg: rgba(191, 219, 254, 0.16);
    --tag-oral-border: rgba(191, 219, 254, 0.34);
    --tag-poster-ink: #5eead4;
    --tag-poster-bg: rgba(94, 234, 212, 0.16);
    --tag-poster-border: rgba(94, 234, 212, 0.34);
    --tag-invited-ink: #d8b4fe;
    --tag-invited-bg: rgba(216, 180, 254, 0.16);
    --tag-invited-border: rgba(216, 180, 254, 0.34);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 700px at -8% -12%, var(--bg-orb-a) 0%, transparent 58%),
    radial-gradient(980px 640px at 104% -18%, var(--bg-orb-b) 0%, transparent 60%),
    radial-gradient(680px 460px at 50% 118%, var(--bg-orb-c) 0%, transparent 70%),
    linear-gradient(136deg, var(--bg-start) 0%, var(--bg) 46%, var(--bg-2) 100%);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
}

:lang(ja) body {
  font-family: var(--jp-round);
  font-weight: 500;
}

:lang(ja) body * {
  font-family: var(--jp-round);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(var(--dot) 0.6px, transparent 0.6px);
  background-size: 20px 20px;
  opacity: var(--grain-opacity);
  mix-blend-mode: normal;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  inset: -6% -18%;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(520px 280px at 12% 18%, var(--card-highlight) 0%, transparent 72%),
    radial-gradient(460px 260px at 88% 12%, var(--card-highlight) 0%, transparent 74%);
  opacity: 0.35;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

.email-link {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  word-break: break-word;
}

header {
  position: sticky;
  top: 0;
  z-index: 24;
  pointer-events: none;
  background: transparent;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.hybrid-header {
  position: relative;
}

.legacy-header {
  pointer-events: auto;
  max-height: 220px;
  overflow: hidden;
  backdrop-filter: blur(14px) saturate(140%);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-line);
  box-shadow: var(--header-shadow);
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.2s ease, transform 0.2s ease, max-height 0.2s ease, border-color 0.2s ease;
}

.hybrid-header.is-compact .legacy-header {
  max-height: 0;
  opacity: 0;
  transform: translateY(-12px);
  border-color: transparent;
  pointer-events: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
}

.floating-menu {
  position: fixed;
  top: 16px;
  right: clamp(10px, 2vw, 24px);
  width: min(340px, calc(100vw - 20px));
  display: grid;
  justify-items: end;
  gap: 10px;
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  transform-origin: top right;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.hybrid-header.is-compact .floating-menu {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.menu-fab {
  position: relative;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--ink);
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  padding: 0;
  box-shadow: var(--header-shadow), var(--ring-soft);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.menu-fab .menu-line {
  position: absolute;
  width: 18px;
  height: 1.8px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-fab .menu-line:nth-child(1) {
  transform: translateY(-5px);
}

.menu-fab .menu-line:nth-child(2) {
  transform: translateY(0);
}

.menu-fab .menu-line:nth-child(3) {
  transform: translateY(5px);
}

.floating-menu.is-open .menu-fab .menu-line:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.floating-menu.is-open .menu-fab .menu-line:nth-child(2) {
  opacity: 0;
}

.floating-menu.is-open .menu-fab .menu-line:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

.menu-fab:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: var(--button-hover-bg);
  box-shadow: var(--hover-shadow);
}

.menu-fab:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.menu-panel {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: var(--card-soft);
  box-shadow: var(--header-shadow), var(--ring-soft);
  backdrop-filter: blur(14px) saturate(140%);
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  transform-origin: top right;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0s linear 0.22s;
}

.floating-menu.is-open .menu-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.container {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand .title {
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-shadow: 0 1px 0 var(--card-highlight);
}

.brand .subtitle {
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--mono);
}

.legacy-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}

.legacy-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.legacy-nav a {
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--muted);
  line-height: 1;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.legacy-nav a:hover {
  background: var(--nav-pill-bg);
  border-color: var(--nav-pill-border);
  color: var(--ink);
  transform: translateY(-1px);
}

.legacy-nav a.active {
  border-color: var(--nav-active-border);
  background: var(--nav-active-bg);
  color: var(--nav-active-ink);
  box-shadow: var(--ring-soft);
}

.legacy-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.menu-panel nav {
  display: grid;
  gap: 8px;
  margin-top: 10px;
  font-size: 0.95rem;
}

.menu-panel nav a {
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--muted);
  line-height: 1;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.menu-panel nav a:hover {
  background: var(--nav-pill-bg);
  border-color: var(--nav-pill-border);
  color: var(--ink);
  transform: translateY(-1px);
}

.menu-panel nav a.active {
  border-color: var(--nav-active-border);
  background: var(--nav-active-bg);
  color: var(--nav-active-ink);
  box-shadow: var(--ring-soft);
}

.menu-actions {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.lang-toggle,
.theme-toggle {
  border: 1px solid var(--line);
  background: var(--button-bg);
  color: var(--ink);
  border-radius: 999px;
  cursor: pointer;
  padding: 6px 12px;
  box-shadow: var(--ring-soft);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.lang-toggle {
  font-family: var(--mono);
  font-size: 0.8rem;
}

.theme-toggle {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  flex: 0 0 auto;
}

.theme-icon {
  position: absolute;
  width: 15px;
  height: 15px;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.theme-icon.sun {
  opacity: 0;
  transform: scale(0.72) rotate(-18deg);
}

.theme-icon.moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

:root[data-theme="dark"] .theme-icon.sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

:root[data-theme="dark"] .theme-icon.moon {
  opacity: 0;
  transform: scale(0.72) rotate(18deg);
}

.lang-toggle:hover,
.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: var(--button-hover-bg);
  box-shadow: var(--hover-shadow);
}

.lang-toggle:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

main {
  position: relative;
  z-index: 1;
  padding: 24px 0 102px;
}

.hero {
  display: grid;
  gap: 22px;
}

.hero h1 {
  font-size: clamp(2rem, 3vw, 2.8rem);
  margin: 0;
  letter-spacing: -0.01em;
  line-height: 1.08;
  text-wrap: balance;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  max-width: 68ch;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  position: relative;
  overflow: hidden;
  contain: layout;
  background: var(--card-soft);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px 28px;
  box-shadow: var(--shadow), var(--ring-soft);
  backdrop-filter: blur(4px);
  transition: transform 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 6%;
  right: 6%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--card-highlight) 50%, transparent 100%);
  pointer-events: none;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  margin: 0 0 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--mono);
  color: var(--muted);
}

.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line) 0%, transparent 100%);
}

.kv {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 10px 16px;
  margin: 0;
}

.kv dt {
  font-family: var(--mono);
  color: var(--muted);
}

.kv dd {
  margin: 0;
}

.grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}

main > section {
  margin-top: 28px;
}

main > section:first-child {
  margin-top: 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-chip-bg);
  border: 1px solid var(--accent-chip-border);
  color: var(--accent);
  font-size: 0.75rem;
  font-family: var(--mono);
  box-shadow: var(--ring-soft);
}

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

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1;
  min-height: 24px;
  font-family: var(--mono);
  letter-spacing: 0.03em;
  border: 1px solid transparent;
}

.tag-badge.lead {
  color: var(--tag-lead-ink);
  background: var(--tag-lead-bg);
  border-color: var(--tag-lead-border);
}

.tag-badge.corresponding {
  color: var(--tag-corresponding-ink);
  background: var(--tag-corresponding-bg);
  border-color: var(--tag-corresponding-border);
}

.tag-badge.last {
  color: var(--tag-last-ink);
  background: var(--tag-last-bg);
  border-color: var(--tag-last-border);
}

.tag-badge.peer {
  color: var(--tag-peer-ink);
  background: var(--tag-peer-bg);
  border-color: var(--tag-peer-border);
}

.tag-badge.presenter-lead {
  color: var(--tag-presenter-lead-ink);
  background: var(--tag-presenter-lead-bg);
  border-color: var(--tag-presenter-lead-border);
}

.tag-badge.presenter-co {
  color: var(--tag-presenter-co-ink);
  background: var(--tag-presenter-co-bg);
  border-color: var(--tag-presenter-co-border);
}

.tag-badge.oral {
  color: var(--tag-oral-ink);
  background: var(--tag-oral-bg);
  border-color: var(--tag-oral-border);
}

.tag-badge.poster {
  color: var(--tag-poster-ink);
  background: var(--tag-poster-bg);
  border-color: var(--tag-poster-border);
}

.tag-badge.invited {
  color: var(--tag-invited-ink);
  background: var(--tag-invited-bg);
  border-color: var(--tag-invited-border);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 6px;
}

.filter-button {
  border: 1px solid var(--line);
  background: var(--button-bg);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 12px;
  min-height: 24px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  box-shadow: var(--ring-soft);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.filter-button.active {
  color: var(--accent);
  border-color: var(--accent-active-border);
  background: var(--accent-active-bg);
}

.filter-button:hover {
  color: var(--ink);
  border-color: var(--accent-chip-border);
  transform: translateY(-1px);
}

.filter-button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.profile-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 20px;
}

.profile-block {
  position: relative;
  overflow: hidden;
  contain: layout;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  background: var(--card-soft);
  box-shadow: var(--elev-shadow), var(--ring-soft);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.profile-block::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--card-highlight) 45%, transparent 100%);
  pointer-events: none;
}

.profile-title {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.profile-affil {
  font-weight: 600;
  margin-bottom: 8px;
}

.list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.concept-grid {
  display: grid;
  gap: 18px;
  align-items: stretch;
}

.concept-grid-research {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.concept-grid-applications {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.concept-panel {
  --concept-accent: #2563eb;
  --concept-accent-soft: rgba(37, 99, 235, 0.18);
  --concept-accent-faint: rgba(37, 99, 235, 0.08);
  --concept-accent-line: rgba(37, 99, 235, 0.26);
  position: relative;
  overflow: hidden;
  contain: layout;
  display: grid;
  gap: 16px;
  align-content: start;
  min-height: 100%;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    radial-gradient(120% 100% at 0% 0%, var(--concept-accent-faint) 0%, transparent 56%),
    var(--card-soft);
  box-shadow: var(--elev-shadow), var(--ring-soft);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.concept-panel svg * {
  animation-play-state: paused;
}

.concept-panel.is-in-view svg * {
  animation-play-state: running;
}

.concept-panel::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 18px;
  width: calc(100% - 36px);
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.7) 50%, transparent 100%);
  pointer-events: none;
}

.concept-panel:hover {
  transform: translateY(-2px);
  border-color: var(--concept-accent-line);
  box-shadow: var(--card-hover-shadow), var(--ring-soft);
}

.concept-panel-causal {
  --concept-accent: #2563eb;
  --concept-accent-soft: rgba(37, 99, 235, 0.18);
  --concept-accent-faint: rgba(37, 99, 235, 0.08);
  --concept-accent-line: rgba(37, 99, 235, 0.26);
}

.concept-panel-statml {
  --concept-accent: #0f766e;
  --concept-accent-soft: rgba(15, 118, 110, 0.18);
  --concept-accent-faint: rgba(15, 118, 110, 0.08);
  --concept-accent-line: rgba(15, 118, 110, 0.26);
}

.concept-panel-dlt {
  --concept-accent: #c2410c;
  --concept-accent-soft: rgba(194, 65, 12, 0.18);
  --concept-accent-faint: rgba(194, 65, 12, 0.08);
  --concept-accent-line: rgba(194, 65, 12, 0.26);
}

.concept-panel-biostat {
  --concept-accent: #15803d;
  --concept-accent-soft: rgba(21, 128, 61, 0.18);
  --concept-accent-faint: rgba(21, 128, 61, 0.08);
  --concept-accent-line: rgba(21, 128, 61, 0.26);
}

.concept-panel-epi {
  --concept-accent: #be123c;
  --concept-accent-soft: rgba(190, 18, 60, 0.18);
  --concept-accent-faint: rgba(190, 18, 60, 0.08);
  --concept-accent-line: rgba(190, 18, 60, 0.26);
}

.concept-panel-econometrics {
  --concept-accent: #7c3aed;
  --concept-accent-soft: rgba(124, 58, 237, 0.18);
  --concept-accent-faint: rgba(124, 58, 237, 0.08);
  --concept-accent-line: rgba(124, 58, 237, 0.26);
}

.concept-copy {
  display: grid;
  gap: 10px;
}

.concept-name {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.25;
  text-wrap: balance;
}

.concept-desc {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.concept-visual {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: 16px;
  border: 1px solid var(--concept-accent-line);
  background:
    radial-gradient(82% 82% at 20% 18%, var(--concept-accent-soft) 0%, transparent 58%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0.08) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.76), var(--ring-soft);
}

.concept-visual::after {
  content: "";
  position: absolute;
  inset: -12% auto auto -6%;
  width: 44%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.44) 0%, transparent 70%);
  pointer-events: none;
}

.concept-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.visual-frame {
  fill: rgba(255, 255, 255, 0.03);
  stroke: rgba(255, 255, 255, 0.24);
  stroke-width: 1.2;
}

.visual-haze {
  fill: var(--concept-accent-soft);
  opacity: 0.9;
  animation: hazePulse 6s ease-in-out infinite;
  transform-origin: center;
  transform-box: fill-box;
}

.signal-line,
.trend-line,
.decision-band,
.weight-line,
.activation-wave,
.step-line,
.cluster-link,
.epi-curve,
.axis-line {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.signal-line,
.activation-wave,
.step-line,
.epi-curve {
  stroke: var(--concept-accent);
}

.signal-line {
  stroke-width: 3;
}

.signal-line.faint {
  stroke-width: 2;
  opacity: 0.34;
  stroke-dasharray: 8 12;
  animation: dashFlow 8s linear infinite;
}

.causal-beam {
  stroke-dasharray: 8 10;
  animation: dashFlow 7s linear infinite;
}

.orbit-ring {
  fill: none;
  stroke: rgba(255, 255, 255, 0.42);
  stroke-width: 1.5;
}

.signal-node,
.layer-node,
.cluster-node,
.sample-marker {
  fill: rgba(255, 255, 255, 0.96);
  stroke: var(--concept-accent);
}

.signal-node {
  stroke-width: 3.6;
  filter: drop-shadow(0 6px 14px rgba(15, 23, 42, 0.14));
}

.spark {
  fill: var(--concept-accent);
  opacity: 0.78;
  animation: sparkPulse 4.4s ease-in-out infinite;
  transform-origin: center;
  transform-box: fill-box;
}

.grid-line {
  fill: none;
  stroke: rgba(148, 163, 184, 0.18);
  stroke-width: 1.1;
}

.decision-band {
  stroke: rgba(15, 23, 42, 0.18);
  stroke-width: 12;
}

.trend-line {
  stroke: var(--concept-accent);
  stroke-width: 3.5;
  stroke-dasharray: 9 12;
  animation: dashFlow 9s linear infinite;
}

.data-dot {
  stroke: rgba(255, 255, 255, 0.72);
  stroke-width: 2;
  animation: nodePulse 5s ease-in-out infinite;
  transform-origin: center;
  transform-box: fill-box;
}

.dot-a {
  fill: #2563eb;
}

.dot-b {
  fill: #0f766e;
}

.dot-c {
  fill: #c2410c;
}

.weight-line {
  stroke: rgba(255, 255, 255, 0.34);
  stroke-width: 1.6;
}

.activation-wave {
  stroke-width: 3;
  opacity: 0.78;
  stroke-dasharray: 10 12;
  animation: dashFlow 10s linear infinite;
}

.layer-node,
.cluster-node {
  stroke-width: 3.4;
  animation: nodePulse 5s ease-in-out infinite;
  transform-origin: center;
  transform-box: fill-box;
}

.axis-line {
  stroke: rgba(15, 23, 42, 0.18);
  stroke-width: 1.6;
}

.confidence-band,
.epi-area {
  fill: var(--concept-accent-soft);
  opacity: 0.82;
}

.step-line,
.epi-curve {
  stroke-width: 4;
}

.policy-line {
  fill: none;
  stroke: var(--concept-accent);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.policy-band {
  fill: none;
  stroke: var(--concept-accent-soft);
  stroke-width: 14;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sample-bar {
  fill: rgba(255, 255, 255, 0.22);
  stroke: rgba(255, 255, 255, 0.34);
  stroke-width: 1.2;
  animation: risePulse 4.4s ease-in-out infinite;
  transform-origin: bottom center;
  transform-box: fill-box;
}

.sample-marker {
  stroke-width: 3;
}

.cluster-link {
  stroke: rgba(255, 255, 255, 0.42);
  stroke-width: 1.9;
}

.choice-node {
  fill: rgba(255, 255, 255, 0.96);
  stroke: var(--concept-accent);
  stroke-width: 3.4;
  animation: nodePulse 5s ease-in-out infinite;
  transform-origin: center;
  transform-box: fill-box;
}

.reward-bar {
  fill: rgba(255, 255, 255, 0.22);
  stroke: rgba(255, 255, 255, 0.34);
  stroke-width: 1.2;
  animation: risePulse 4.4s ease-in-out infinite;
  transform-origin: bottom center;
  transform-box: fill-box;
}

.delay-1,
.spark-delay-1 {
  animation-delay: -0.3s;
}

.delay-2,
.spark-delay-2 {
  animation-delay: -1.2s;
}

.delay-3,
.spark-delay-3 {
  animation-delay: -2.1s;
}

@keyframes dashFlow {
  to {
    stroke-dashoffset: -36;
  }
}

@keyframes sparkPulse {
  0%,
  100% {
    opacity: 0.28;
    transform: scale(0.72);
  }
  50% {
    opacity: 1;
    transform: scale(1.16);
  }
}

@keyframes nodePulse {
  0%,
  100% {
    opacity: 0.86;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.08);
  }
}

@keyframes hazePulse {
  0%,
  100% {
    opacity: 0.62;
    transform: scale(0.96);
  }
  50% {
    opacity: 1;
    transform: scale(1.06);
  }
}

@keyframes risePulse {
  0%,
  100% {
    transform: scaleY(0.94);
    opacity: 0.72;
  }
  50% {
    transform: scaleY(1.02);
    opacity: 1;
  }
}

:root[data-theme="dark"] .visual-frame {
  stroke: rgba(148, 163, 184, 0.28);
}

:root[data-theme="dark"] .grid-line,
:root[data-theme="dark"] .axis-line {
  stroke: rgba(148, 163, 184, 0.22);
}

:root[data-theme="dark"] .decision-band {
  stroke: rgba(229, 237, 248, 0.14);
}

:root[data-theme="dark"] .weight-line,
:root[data-theme="dark"] .cluster-link,
:root[data-theme="dark"] .orbit-ring {
  stroke: rgba(203, 213, 225, 0.34);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .visual-frame {
    stroke: rgba(148, 163, 184, 0.28);
  }

  :root:not([data-theme="light"]) .grid-line,
  :root:not([data-theme="light"]) .axis-line {
    stroke: rgba(148, 163, 184, 0.22);
  }

  :root:not([data-theme="light"]) .decision-band {
    stroke: rgba(229, 237, 248, 0.14);
  }

  :root:not([data-theme="light"]) .weight-line,
  :root:not([data-theme="light"]) .cluster-link,
  :root:not([data-theme="light"]) .orbit-ring {
    stroke: rgba(203, 213, 225, 0.34);
  }
}

@media (max-width: 980px) {
  .concept-grid-research {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .concept-grid-applications {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .concept-grid-research .concept-panel-dlt {
    grid-column: span 2;
  }

  .concept-grid-applications .concept-panel-econometrics {
    grid-column: span 2;
  }
}

.paper {
  position: relative;
  overflow: hidden;
  contain: layout;
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  background: var(--card-soft);
  box-shadow: var(--ring-soft);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.paper::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--card-highlight) 45%, transparent 100%);
  pointer-events: none;
}

.card:hover,
.profile-block:hover,
.paper:hover {
  transform: translateY(-2px);
  border-color: var(--card-hover-border);
  box-shadow: var(--card-hover-shadow), var(--ring-soft);
}

[hidden] {
  display: none !important;
}

.citation-box {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: var(--surface-soft);
  box-shadow: var(--ring-soft);
}

.citation-box .section-title {
  font-size: 0.85rem;
  margin-bottom: 6px;
  letter-spacing: 0.06em;
}

.paper h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.35;
  min-height: 2.7em;
}

.paper-title-link {
  color: inherit;
  text-decoration: none;
}

#papers-list .paper-title-link,
#papers-list .citation-box .meta,
.conference-list .paper h3,
.conference-list .cv-meta li > span:last-child {
  font-family: var(--research-serif);
}

.paper-title-link:hover {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.paper-title-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.paper .links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
}

.inline-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.inline-brand-link::before {
  content: "";
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  background-color: currentColor;
  -webkit-mask-image: var(--brand-icon-url);
  mask-image: var(--brand-icon-url);
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: var(--button-bg);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-family: var(--mono);
  color: var(--ink);
  cursor: pointer;
  box-shadow: var(--ring-soft);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease,
    color 0.2s ease;
}

.button:hover {
  border-color: var(--accent);
  background: var(--button-hover-bg);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--hover-shadow);
}

.button-with-icon {
  gap: 7px;
}

.button-with-icon .button-icon {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}

.button-with-icon .button-label {
  display: inline-block;
}

.cv-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.cv-table th {
  text-align: left;
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.cv-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  vertical-align: top;
}

.cv-table.jobs col.col-period {
  width: 170px;
}

.cv-table.jobs col.col-notes {
  width: 20em;
}

.cv-table.jobs {
  table-layout: fixed;
}

.cv-table.jobs td:nth-child(3),
.cv-table.jobs th:nth-child(3) {
  text-align: left;
  white-space: normal;
  word-break: break-word;
}

.notes-stack {
  display: grid;
  gap: 4px;
}

.cv-table th + th,
.cv-table td + td {
  border-left: 1px solid var(--line);
}

.cv-table.jobs td:first-child,
.cv-table.jobs th:first-child {
  width: 170px;
}

.cv-table .muted-row td {
  color: var(--muted);
  background: var(--row-muted-bg);
}

.cv-table .muted-row .cv-role {
  color: var(--muted);
}

.cv-table .ended-row td {
  background: var(--row-ended-bg);
}

.cv-table td:first-child,
.cv-table th:first-child {
  width: 170px;
}

.period {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.85rem;
  display: grid;
  gap: 2px;
  white-space: nowrap;
}

.cv-role {
  font-weight: 600;
  margin-bottom: 6px;
}

.cv-sublist {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 4px;
  color: var(--ink);
}

.cv-meta {
  margin: 0;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  color: var(--ink);
}

.cv-meta li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 10px;
  align-items: start;
}

.cv-meta.compact li {
  grid-template-columns: 72px 1fr;
  gap: 6px;
}

.cv-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.author-name {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.name-strong {
  font-weight: 600;
}

.name-strong.jp {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.conference-list {
  display: grid;
  gap: 18px;
}

.lang-en {
  display: inline;
}

.lang-ja {
  display: none;
}

html[lang="ja"] .lang-en {
  display: none;
}

html[lang="ja"] .lang-ja {
  display: inline;
}

.cv-table tr:last-child td {
  border-bottom: none;
}

footer {
  border-top: 1px solid var(--footer-line);
  padding: 24px 0 32px;
  color: var(--muted);
  font-size: 0.9rem;
  background: linear-gradient(180deg, var(--footer-bg) 0%, var(--header-bg) 100%);
  backdrop-filter: blur(10px);
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.85rem;
  align-items: center;
}

.icon-link {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--ink);
  box-shadow: var(--ring-soft);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, color 0.2s ease,
    background 0.2s ease;
}

.icon-link svg {
  width: 18px;
  height: 18px;
}

.brand-mark {
  width: 18px;
  height: 18px;
  display: inline-block;
  background-color: currentColor;
  -webkit-mask-image: var(--brand-icon-url);
  mask-image: var(--brand-icon-url);
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
}

.brand-arxiv {
  --brand-icon-url: url("https://cdn.simpleicons.org/arxiv");
}

.brand-doi {
  --brand-icon-url: url("https://cdn.simpleicons.org/doi");
}

.icon-link[data-brand="x"] svg {
  width: 16px;
  height: 16px;
}

.icon-link:hover {
  border-color: var(--accent);
  background: var(--button-hover-bg);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--hover-shadow);
}

.icon-link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.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;
}

.reveal {
  opacity: 0;
  transform: translateY(10px);
  animation: fadeUp 0.7s ease forwards;
  animation-delay: var(--delay, 0s);
}

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

@media (max-width: 720px) {
  header {
    top: 0;
  }

  .concept-grid-research,
  .concept-grid-applications {
    grid-template-columns: 1fr;
  }

  .concept-grid-research .concept-panel-dlt {
    grid-column: auto;
  }

  .concept-grid-applications .concept-panel-econometrics {
    grid-column: auto;
  }

  .concept-panel {
    padding: 16px;
  }

  .concept-name {
    font-size: 1.02rem;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 0;
  }

  .legacy-right {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .legacy-nav {
    gap: 6px;
  }

  .legacy-nav a {
    padding: 7px 9px;
  }

  .floating-menu {
    top: 12px;
    right: 12px;
    width: calc(100vw - 24px);
  }

  .menu-panel {
    border-radius: 16px;
    padding: 12px;
  }

  .menu-panel nav {
    gap: 6px;
  }

  .menu-panel nav a {
    padding: 9px 11px;
  }

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

  .cv-table th,
  .cv-table td {
    padding: 10px 12px;
  }

  .cv-table.jobs {
    min-width: 720px;
  }
}

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

.table-scroll {
  overflow-x: auto;
  contain: paint;
  -webkit-overflow-scrolling: touch;
}

.table-scroll .cv-table {
  min-width: 720px;
}

@media (max-width: 720px) {
  .table-scroll {
    margin-right: -4px;
    padding-bottom: 4px;
  }
}