:root {
  --bg-1: #f5f8ff;
  --bg-2: #e8f0ff;
  --surface: rgba(255, 255, 255, 0.74);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --border: rgba(17, 32, 79, 0.12);
  --shadow: 0 24px 60px rgba(25, 46, 98, 0.12);
  --shadow-soft: 0 14px 32px rgba(25, 46, 98, 0.08);
  --text-main: #12213f;
  --text-muted: #5f6e91;
  --accent: #2176ff;
  --accent-strong: #185adb;
  --accent-soft: #dce8ff;
  --assistant-bubble: #eff4ff;
  --user-bubble: linear-gradient(135deg, #2176ff, #42b4ff);
  --danger: #d64252;
  --success: #1f9d71;
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --bubble-max-width: 23vw;
  --font-display: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Noto Sans SC", "Segoe UI", sans-serif;
}

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&family=Space+Grotesk:wght@500;700&display=swap");

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(33, 118, 255, 0.16), transparent 34%),
    radial-gradient(circle at top right, rgba(0, 194, 255, 0.14), transparent 32%),
    linear-gradient(180deg, var(--bg-1), #f9fbff 48%, #eef4ff 100%);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
}

body.is-resizing-chat {
  user-select: none;
  cursor: nwse-resize;
}

.page-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.32), transparent 35%),
    radial-gradient(circle at 20% 20%, rgba(33, 118, 255, 0.09), transparent 24%),
    radial-gradient(circle at 80% 12%, rgba(52, 211, 255, 0.08), transparent 18%);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 28px;
  backdrop-filter: blur(16px);
  background: rgba(245, 248, 255, 0.72);
  border-bottom: 1px solid rgba(17, 32, 79, 0.08);
}

.logo-mark {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.site-nav a.active,
.site-nav a:hover {
  color: var(--text-main);
}

.lang-toggle {
  display: flex;
  gap: 8px;
}

.lang-btn,
.ghost-btn,
.primary-btn,
.inline-select {
  border-radius: 999px;
  border: 1px solid var(--border);
}

.lang-btn,
.ghost-btn {
  background: rgba(255, 255, 255, 0.78);
  color: var(--text-main);
  cursor: pointer;
  padding: 10px 14px;
}

.lang-btn.is-active {
  background: var(--accent-soft);
  border-color: rgba(33, 118, 255, 0.22);
  color: var(--accent-strong);
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent), #2aa3ff);
  color: #fff;
  cursor: pointer;
  padding: 12px 18px;
  border: none;
  box-shadow: 0 16px 26px rgba(33, 118, 255, 0.2);
}

.primary-btn:hover,
.ghost-btn:hover,
.lang-btn:hover {
  transform: translateY(-1px);
}

.page-shell {
  position: relative;
  z-index: 1;
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px 24px 56px;
}

.page-shell-compact {
  max-width: 980px;
}

.page-shell-narrow {
  max-width: 920px;
}

.hero-grid,
.profile-grid,
.content-grid {
  display: grid;
  gap: 24px;
}

.hero-grid {
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  margin-bottom: 28px;
}

.profile-grid {
  grid-template-columns: repeat(12, minmax(0, 1fr));
  margin-bottom: 28px;
}

.content-grid {
  grid-template-columns: minmax(0, 1.5fr) minmax(320px, 1fr);
  align-items: start;
}

.hero-card,
.glass-card {
  background: var(--surface);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 22px;
}

.hero-card-main {
  min-height: 380px;
}

.hero-card-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hero-panel {
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.56);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(17, 32, 79, 0.08);
}

.eyebrow,
.section-label,
.mini-label {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.08;
}

h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.85rem);
  max-width: 15ch;
}

h2 {
  font-size: 1.6rem;
}

h3 {
  font-size: 1.15rem;
}

.hero-summary,
.section-copy,
.helper-text,
.chat-disclaimer,
.metrics-refresh-note {
  color: var(--text-muted);
}

.hero-summary {
  max-width: 62ch;
  margin: 14px 0 18px;
  font-size: 0.98rem;
}

.intro-card {
  margin-bottom: 18px;
}

.intro-card-compact h1 {
  max-width: none;
  font-size: clamp(1.85rem, 3vw, 2.5rem);
}

.page-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.academic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 18px;
}

.info-card,
.page-section,
.comments-card-wide {
  padding: 18px;
}

.entry-list {
  display: grid;
  gap: 10px;
}

.entry-card {
  padding: 14px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(17, 32, 79, 0.08);
  box-shadow: var(--shadow-soft);
}

.entry-meta,
.entry-detail,
.entry-link {
  color: var(--text-muted);
}

.entry-meta,
.entry-detail {
  margin: 10px 0 0;
}

.entry-link {
  display: inline-block;
  margin-top: 12px;
  color: var(--accent-strong);
}

.spotlight-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.spotlight-card {
  min-height: 160px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(232, 240, 255, 0.7));
  border: 1px solid rgba(17, 32, 79, 0.08);
  box-shadow: var(--shadow-soft);
}

.spotlight-card p {
  margin: 10px 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.rich-copy {
  display: grid;
  gap: 12px;
}

.rich-copy p,
.detail-list {
  margin: 0;
}

.detail-list {
  padding-left: 20px;
  color: var(--text-muted);
}

.detail-list li + li {
  margin-top: 10px;
}

.card-divider {
  height: 1px;
  margin: 20px 0 18px;
  background: rgba(17, 32, 79, 0.08);
}

.resource-list {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.resource-card {
  display: block;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(17, 32, 79, 0.08);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-soft);
}

.resource-card h3 {
  font-size: 1rem;
}

.resource-card p {
  margin: 8px 0 0;
  color: var(--text-muted);
}

.resource-card:hover {
  border-color: rgba(33, 118, 255, 0.18);
  transform: translateY(-1px);
}

.glass-card {
  padding: 18px;
}

.profile-card {
  grid-column: span 4;
}

.profile-card-wide {
  grid-column: span 6;
}

.chat-card,
.comments-card,
.metrics-shell,
.manager-shell {
  min-height: 100%;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.section-head-stack {
  align-items: start;
}

.desktop-controls,
.manager-auth,
.inline-form,
.pager {
  display: flex;
  align-items: center;
  gap: 12px;
}

.desktop-controls {
  margin-bottom: 16px;
  color: var(--text-muted);
}

.desktop-controls input[type="range"] {
  flex: 1;
}

.happy-toggle,
.chat-toggle {
  position: fixed;
  right: 24px;
  z-index: 40;
  border: none;
  border-radius: 999px;
  width: 58px;
  height: 58px;
  padding: 0;
  background: linear-gradient(135deg, var(--accent), #2aa3ff);
  color: #fff;
  box-shadow: 0 16px 26px rgba(33, 118, 255, 0.24);
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.chat-toggle {
  bottom: 24px;
}

.happy-toggle {
  bottom: 94px;
  z-index: 39;
  background: linear-gradient(135deg, #ff6d8b, #ff9478);
  width: auto;
  min-width: 90px;
  height: 46px;
  padding: 0 14px;
  font-size: 0.86rem;
}

.happy-toggle.is-hidden,
.chat-toggle.is-hidden {
  display: none;
}

.happy-widget,
.chat-widget {
  position: fixed;
  right: 24px;
  z-index: 45;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.happy-widget {
  bottom: 158px;
  width: min(330px, calc(100vw - 32px));
  padding: 16px;
}

.chat-widget {
  bottom: 24px;
  width: min(390px, calc(100vw - 32px));
  min-width: 320px;
  min-height: 360px;
  max-width: min(520px, calc(100vw - 24px));
  max-height: min(78vh, 760px);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.happy-widget-head,
.chat-widget-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.chat-widget-head {
  padding-left: 20px;
}

.chat-widget-actions,
.happy-widget-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.chat-close-btn {
  white-space: nowrap;
}

.chat-resize-handle {
  position: absolute;
  top: 12px;
  left: 12px;
  width: 14px;
  height: 14px;
  border-top: 2px solid rgba(33, 118, 255, 0.38);
  border-left: 2px solid rgba(33, 118, 255, 0.38);
  border-top-left-radius: 8px;
  cursor: nwse-resize;
}

.happy-badge {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(33, 118, 255, 0.08);
  color: var(--accent-strong);
  font-size: 0.85rem;
  font-weight: 600;
}

.happy-badge.is-unlocked {
  background: rgba(31, 157, 113, 0.12);
  color: var(--success);
}

.stacked-form {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

#chat-window {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 260px;
  max-height: 560px;
  overflow-y: auto;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(235, 242, 255, 0.72));
  border: 1px solid rgba(17, 32, 79, 0.08);
}

.chat-widget #chat-window {
  flex: 1;
  min-height: 180px;
  max-height: none;
}

.message {
  max-width: min(var(--bubble-max-width), 78%);
  padding: 12px 14px;
  border-radius: 18px;
  box-shadow: var(--shadow-soft);
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user {
  align-self: end;
  color: #fff;
  background: var(--user-bubble);
  border-bottom-right-radius: 8px;
}

.message.assistant {
  align-self: start;
  background: var(--assistant-bubble);
  border: 1px solid rgba(17, 32, 79, 0.08);
  border-bottom-left-radius: 8px;
}

.message.assistant.blocked {
  border-color: rgba(214, 66, 82, 0.22);
  color: var(--danger);
}

.message.typing,
.message.error {
  align-self: center;
  max-width: 100%;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.8);
}

.message.error {
  color: var(--danger);
  border: 1px solid rgba(214, 66, 82, 0.2);
}

#chat-form,
.comment-form,
.manager-form {
  display: grid;
  gap: 10px;
}

#chat-form {
  margin-top: 10px;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
}

.chat-widget #chat-form {
  margin-top: 0;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid rgba(17, 32, 79, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.84);
  color: var(--text-main);
  padding: 12px 14px;
  outline: none;
}

textarea:focus,
input:focus,
select:focus {
  border-color: rgba(33, 118, 255, 0.28);
  box-shadow: 0 0 0 4px rgba(33, 118, 255, 0.08);
}

.chat-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 4px;
}

.char-counter {
  font-size: 0.88rem;
}

.char-counter.near-limit {
  color: #b57918;
}

.char-counter.over-limit {
  color: var(--danger);
}

.chat-disclaimer,
.helper-text {
  margin: 0;
  font-size: 0.92rem;
}

.comments-list {
  display: grid;
  gap: 10px;
  margin: 12px 0;
}

.comment-card {
  padding: 12px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(17, 32, 79, 0.08);
}

.comment-meta,
.comment-votes,
.comment-ratings {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.comment-form-row,
.rating-grid {
  display: grid;
  gap: 10px;
}

.comment-form-row {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  align-items: start;
}

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

.rating-grid label {
  display: grid;
  gap: 6px;
}

.comment-meta {
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.comment-author {
  font-weight: 600;
}

.comment-time,
.comment-score {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.comment-card p {
  margin: 0 0 8px;
}

.vote-btn {
  border: none;
  background: rgba(33, 118, 255, 0.08);
  color: var(--accent-strong);
  border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
}

.vote-btn:hover {
  background: rgba(33, 118, 255, 0.14);
}

.inline-select {
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.86);
}

.pager {
  justify-content: space-between;
}

.metric-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(17, 32, 79, 0.08);
  text-align: center;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
  margin: 20px 0 28px;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--accent-strong);
}

.metric-label {
  color: var(--text-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.metrics-section-title {
  margin-bottom: 12px;
  color: var(--text-muted);
  font-size: 0.84rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.latency-bar-row {
  display: grid;
  grid-template-columns: 86px 1fr 52px;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
}

.latency-bar-bg {
  height: 14px;
  border-radius: 999px;
  background: rgba(17, 32, 79, 0.08);
  overflow: hidden;
}

.latency-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #3dc5ff, var(--accent));
}

.metrics-error {
  color: var(--danger);
}

.manager-fields {
  display: grid;
  gap: 18px;
}

.manager-hero {
  margin-bottom: 18px;
}

.manager-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.4fr);
  gap: 18px;
  align-items: start;
}

.manager-side-card,
.manager-main-card {
  min-height: 100%;
}

.manager-auth-wide {
  flex-wrap: wrap;
}

.manager-summary-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.manager-summary-card {
  padding: 14px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(17, 32, 79, 0.08);
  box-shadow: var(--shadow-soft);
}

.manager-summary-card h3 {
  margin-bottom: 6px;
  font-size: 1rem;
}

.manager-summary-card p {
  margin: 0;
  color: var(--text-muted);
}

.manager-section {
  display: grid;
  gap: 12px;
}

.manager-section-head h3 {
  margin-bottom: 6px;
}

.manager-section-head p {
  margin: 0;
  color: var(--text-muted);
}

.manager-group {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(17, 32, 79, 0.08);
}

.manager-group h3 {
  margin-bottom: 12px;
}

.manager-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.sync-notes {
  display: grid;
  gap: 8px;
}

.sync-note {
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: rgba(33, 118, 255, 0.08);
  color: var(--accent-strong);
}

.desktop-only {
  display: flex;
}

@media (max-width: 1100px) {
  .hero-grid,
  .profile-grid,
  .content-grid {
    grid-template-columns: 1fr;
  }

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

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

  .profile-card,
  .profile-card-wide {
    grid-column: auto;
  }

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

  .message {
    max-width: 86%;
  }
}

@media (max-width: 860px) {
  .site-header {
    flex-wrap: wrap;
    justify-content: center;
  }

  .site-nav {
    justify-content: center;
    flex-wrap: wrap;
  }

  #chat-form {
    grid-template-columns: 1fr;
  }

  .chat-footer,
  .manager-row,
  .comment-form-row {
    grid-template-columns: 1fr;
    display: grid;
  }

  .happy-toggle,
  .chat-toggle,
  .happy-widget,
  .chat-widget {
    right: 16px;
  }

  .chat-toggle {
    bottom: 16px;
  }

  .happy-toggle {
    bottom: 86px;
  }

  .happy-widget {
    bottom: 150px;
    left: 16px;
    width: auto;
  }

  .chat-widget {
    left: 16px;
    width: auto;
    min-width: 0;
    max-width: none;
    height: min(74vh, 620px);
  }

  .desktop-only {
    display: none;
  }
}

@media (pointer: coarse) {
  .desktop-only {
    display: none;
  }

  .chat-resize-handle {
    display: none;
  }

  .message {
    max-width: 88%;
  }
}