@font-face {
  font-family: "LINE Seed Sans TW";
  src: url("/assets/fonts/line-seed-tw/LINESeedTW_OTF_Rg.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "LINE Seed Sans TW";
  src: url("/assets/fonts/line-seed-tw/LINESeedTW_OTF_Bd.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

@font-face {
  font-family: "LINE Seed Sans TW";
  src: url("/assets/fonts/line-seed-tw/LINESeedTW_OTF_Eb.woff2") format("woff2");
  font-style: normal;
  font-weight: 800;
  font-display: swap;
}

:root {
  --spark-font-ui: "LINE Seed Sans TW", "Inter", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  /* Compatibility aliases for the existing student pages. */
  --primary-glow: var(--spark-accent);
  --danger-glow: var(--spark-danger);
  --bg-dark: var(--spark-bg);
  --bg-panel: var(--spark-surface);
  --text-light: var(--spark-text);
  --text-muted: var(--spark-text-soft);
  --border-color: var(--spark-border);
  --primary: var(--spark-accent);
  --bg: var(--spark-bg);
  --panel: var(--spark-surface);
  --border: var(--spark-border);
  --text: var(--spark-text);
  --glow: var(--spark-accent);
  --selected: var(--spark-accent-soft);
  --peer: #22a05a;
  --expert: #d97706;
  --assistant: #0284c7;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--spark-bg);
}

body.spark-student-page {
  min-height: 100vh;
  font-family: var(--spark-font-ui);
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--spark-text);
  background-color: var(--spark-bg);
  background-image:
    radial-gradient(circle at 8% 4%, var(--spark-glow-a), transparent 34rem),
    radial-gradient(circle at 95% 15%, var(--spark-glow-b), transparent 32rem),
    linear-gradient(var(--spark-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--spark-grid) 1px, transparent 1px);
  background-size: auto, auto, 32px 32px, 32px 32px;
  background-attachment: fixed;
  transition: background-color 180ms ease, color 180ms ease;
}

body.spark-theme-open {
  overflow: hidden;
}

body.spark-student-page button,
body.spark-student-page textarea,
body.spark-student-page input,
body.spark-student-page select {
  font: inherit;
}

body.spark-student-page a {
  color: var(--spark-accent);
}

body.spark-student-page :focus-visible {
  outline: 3px solid color-mix(in srgb, var(--spark-accent) 55%, transparent);
  outline-offset: 3px;
}

body.spark-student-page ::selection {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
}

body.spark-student-page ::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

body.spark-student-page ::-webkit-scrollbar-track {
  background: transparent;
}

body.spark-student-page ::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--spark-text-soft) 42%, transparent);
  border: 3px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}

/* Theme picker */
.spark-theme-toggle {
  position: fixed;
  z-index: 9000;
  top: 82px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid var(--spark-border-strong);
  border-radius: 999px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  box-shadow: var(--spark-shadow-soft);
  cursor: pointer;
  font-weight: 700;
  letter-spacing: .02em;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.spark-theme-toggle:hover {
  transform: translateY(-2px);
  color: var(--spark-accent);
  border-color: var(--spark-accent);
}

.spark-theme-toggle > span:first-child {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  color: var(--spark-accent-contrast);
  background: linear-gradient(135deg, var(--spark-accent), var(--spark-secondary));
  border-radius: 50%;
}

.spark-theme-backdrop {
  position: fixed;
  z-index: 9100;
  inset: 0;
  background: rgba(4, 12, 24, .54);
  backdrop-filter: blur(6px);
}

.spark-theme-backdrop[hidden],
.spark-theme-dialog[hidden] {
  display: none !important;
}

.spark-theme-dialog {
  position: fixed;
  z-index: 9200;
  top: 50%;
  left: 50%;
  width: min(720px, calc(100vw - 32px));
  max-height: min(780px, calc(100vh - 32px));
  overflow: auto;
  transform: translate(-50%, -50%);
  padding: 24px;
  border: 1px solid var(--spark-border);
  border-radius: 24px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  box-shadow: 0 30px 90px rgba(0, 0, 0, .3);
}

.spark-theme-dialog__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.spark-theme-dialog__head h2 {
  margin: 2px 0 4px;
  color: var(--spark-text);
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.spark-theme-dialog__head p {
  margin: 0;
  color: var(--spark-text-soft);
}

.spark-theme-eyebrow {
  color: var(--spark-accent) !important;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.spark-theme-close {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--spark-border);
  border-radius: 50%;
  color: var(--spark-text);
  background: var(--spark-surface-soft);
  cursor: pointer;
  font-size: 28px;
  line-height: 1;
}

.spark-theme-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.spark-theme-option {
  position: relative;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  min-height: 118px;
  padding: 14px;
  overflow: hidden;
  border: 2px solid var(--spark-border);
  border-radius: 18px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  cursor: pointer;
  text-align: left;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.spark-theme-option:hover {
  transform: translateY(-2px);
  border-color: var(--spark-accent);
  box-shadow: var(--spark-shadow-soft);
}

.spark-theme-option.is-active {
  border-color: var(--spark-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--spark-accent) 18%, transparent);
}

.spark-theme-option.is-active::after {
  content: "✓";
  position: absolute;
  top: 10px;
  right: 10px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  font-size: 14px;
  font-weight: 900;
}

.spark-theme-option__copy {
  align-self: center;
  min-width: 0;
  padding-right: 22px;
}

.spark-theme-option__copy strong,
.spark-theme-option__copy small {
  display: block;
}

.spark-theme-option__copy strong {
  margin-bottom: 5px;
  font-size: 1rem;
}

.spark-theme-option__copy small {
  color: var(--spark-text-soft);
  line-height: 1.5;
}

.spark-theme-swatches {
  position: absolute;
  right: 14px;
  bottom: 12px;
  display: flex;
}

.spark-theme-swatches i {
  display: block;
  width: 16px;
  height: 16px;
  margin-left: -3px;
  border: 2px solid white;
  border-radius: 50%;
  background: var(--swatch);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, .2);
}

.spark-theme-preview {
  display: grid;
  grid-template-columns: 18px 1fr;
  grid-template-rows: 16px 1fr;
  width: 88px;
  height: 78px;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, .22);
  border-radius: 10px;
  box-shadow: 0 6px 14px rgba(0, 0, 0, .14);
}

.spark-theme-preview__bar {
  grid-column: 1 / -1;
  background: var(--preview-accent);
}

.spark-theme-preview__nav {
  background: var(--preview-soft);
}

.spark-theme-preview__content {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px 7px;
  background: var(--preview-bg);
}

.spark-theme-preview__content i {
  display: block;
  width: 100%;
  height: 7px;
  border-radius: 3px;
  background: var(--preview-card);
}

.spark-theme-preview__content i:last-child {
  width: 65%;
  background: var(--preview-accent);
}

.spark-theme-preview--aurora {
  --preview-bg: #f4f8ff;
  --preview-soft: #d6f5ef;
  --preview-card: #c7d7ee;
  --preview-accent: #2563eb;
}

.spark-theme-preview--midnight {
  --preview-bg: #07111f;
  --preview-soft: #14243b;
  --preview-card: #314762;
  --preview-accent: #38bdf8;
}

.spark-theme-preview--notebook {
  --preview-bg: #f7f1e6;
  --preview-soft: #dfeede;
  --preview-card: #d5c3a8;
  --preview-accent: #a94f0c;
}

.spark-theme-preview--focus {
  --preview-bg: #fff;
  --preview-soft: #e5e7eb;
  --preview-card: #111827;
  --preview-accent: #005fcc;
}

.spark-theme-help {
  margin: 18px 0 0;
  color: var(--spark-text-soft);
  font-size: .82rem;
  text-align: center;
}

/* Shared student-page surfaces */
body.spark-student-page header {
  color: var(--spark-text);
  background: color-mix(in srgb, var(--spark-surface-solid) 88%, transparent);
  border-color: var(--spark-border);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--spark-border) 65%, transparent);
}

body.spark-student-page header img {
  object-fit: contain;
  border: 1px solid var(--spark-border);
  border-radius: 12px;
  box-shadow: var(--spark-shadow-soft);
}

body.spark-student-page .main-title,
body.spark-student-page .activity-title,
body.spark-student-page .qtitle,
body.spark-student-page .intro-container h1,
body.spark-forum header span {
  font-family: var(--spark-font-ui);
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--spark-accent);
  text-shadow: none;
}

body.spark-student-page .btn,
body.spark-student-page button {
  transition: transform 150ms ease, color 150ms ease, background 150ms ease,
    border-color 150ms ease, box-shadow 150ms ease;
}

body.spark-student-page .btn:hover:not(:disabled),
body.spark-student-page button:hover:not(:disabled) {
  transform: translateY(-1px);
}

body.spark-student-page .btn {
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
}

body.spark-student-page .btn.brand {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  border-color: var(--spark-accent);
}

body.spark-student-page .btn.brand:hover:not(:disabled) {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent-strong);
  box-shadow: var(--spark-shadow-soft);
}

body.spark-student-page textarea,
body.spark-student-page input,
body.spark-student-page select {
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border-strong);
}

body.spark-student-page textarea::placeholder,
body.spark-student-page input::placeholder {
  color: var(--spark-text-soft);
  opacity: .82;
}

/* Home */
body.spark-home header {
  position: sticky;
  z-index: 100;
  top: 0;
  padding: 14px max(22px, calc((100vw - 1240px) / 2));
}

body.spark-home .logo-container img {
  width: auto;
  height: 56px;
  max-width: min(150px, 32vw);
}

body.spark-home .main-title {
  font-family: var(--spark-font-ui);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 800;
  letter-spacing: -.01em;
}

body.spark-home .rightBox {
  padding-right: 82px;
}

body.spark-home .auth {
  color: var(--spark-text);
}

body.spark-home .meta,
body.spark-home .info,
body.spark-home footer {
  color: var(--spark-text-soft);
}

body.spark-home .pill {
  color: var(--spark-secondary);
  background: var(--spark-secondary-soft);
  border-color: color-mix(in srgb, var(--spark-secondary) 32%, transparent);
}

body.spark-home main {
  width: min(1240px, calc(100% - 36px));
  margin: 32px auto 48px;
  padding: 0;
  gap: 22px;
}

body.spark-home .info {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3vw, 34px);
  border-color: var(--spark-border);
  border-radius: 24px;
  background: var(--spark-surface);
  box-shadow: var(--spark-shadow-soft);
}

body.spark-home .info::before {
  content: "SPARK";
  position: absolute;
  right: 20px;
  bottom: -32px;
  color: color-mix(in srgb, var(--spark-accent) 6%, transparent);
  font-size: clamp(5rem, 14vw, 10rem);
  font-weight: 900;
  letter-spacing: -.08em;
  pointer-events: none;
}

body.spark-home .info b,
body.spark-home .card-content h2 {
  color: var(--spark-text);
}

body.spark-home .info .small {
  color: var(--spark-text-soft);
}

body.spark-home .notice-inline {
  color: var(--spark-accent-strong);
  background: var(--spark-accent-soft);
  border-color: color-mix(in srgb, var(--spark-accent) 30%, transparent);
}

body.spark-home #activityGrid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}

body.spark-home #activityGrid > p {
  color: var(--spark-text-soft) !important;
}

body.spark-home .card {
  min-height: 248px;
  border-color: var(--spark-border);
  border-radius: 22px;
  background: var(--spark-surface-solid);
  box-shadow: var(--spark-shadow-soft);
}

body.spark-home .card:not(.disabled):hover {
  transform: translateY(-5px);
  border-color: var(--spark-accent);
  box-shadow: var(--spark-shadow);
}

body.spark-home .card img {
  height: 190px;
  background: var(--spark-surface-soft);
  border-color: var(--spark-border);
}

body.spark-home footer {
  position: static;
  flex-wrap: wrap;
  padding: 20px;
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
}

/* Activity */
body.spark-activity header {
  min-height: 68px;
  height: auto;
  padding: 8px max(22px, calc((100vw - 1500px) / 2));
}

body.spark-activity .logo-container img {
  width: auto;
  height: 52px;
  max-width: min(140px, 30vw);
}

body.spark-activity .auth {
  padding-right: 82px;
  color: var(--spark-text-soft);
}

body.spark-activity .page {
  width: min(1500px, calc(100% - 32px));
  max-width: none;
  min-height: calc(100vh - 100px);
  height: auto;
  margin: 18px auto 30px;
  padding: 0;
  grid-template-columns: minmax(190px, .72fr) minmax(360px, 1.75fr) minmax(340px, 1.35fr);
  gap: 16px;
  align-items: stretch;
}

body.spark-activity .card {
  min-width: 0;
  border-color: var(--spark-border);
  border-radius: 20px;
  color: var(--spark-text);
  background: var(--spark-surface);
  box-shadow: var(--spark-shadow-soft);
}

body.spark-activity .card .head {
  padding: 16px 18px;
  color: var(--spark-text);
  background: color-mix(in srgb, var(--spark-surface-soft) 72%, transparent);
  border-color: var(--spark-border);
}

body.spark-activity .card .body {
  padding: 18px;
}

body.spark-activity .chip,
body.spark-activity .choice-label,
body.spark-activity .ordering-item,
body.spark-activity .matching-item {
  color: var(--spark-text-soft);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
}

body.spark-activity .chip:hover,
body.spark-activity .choice-label:hover {
  color: var(--spark-text);
  background: var(--spark-accent-soft);
  border-color: var(--spark-accent);
}

body.spark-activity .chip.active,
body.spark-activity .choice-label.selected {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  border-color: var(--spark-accent);
  box-shadow: none;
}

body.spark-activity .qtitle,
body.spark-activity .ai-record-header,
body.spark-activity .ai-chat-meta strong {
  color: var(--spark-accent);
}

body.spark-activity .rich-text-content {
  color: var(--spark-text);
}

body.spark-activity .inputbox textarea,
body.spark-activity .ai-record-panel,
body.spark-activity .ai-tab {
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
}

body.spark-activity .ai-tab.active {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  border-color: var(--spark-accent);
}

body.spark-activity .ai-record-body,
body.spark-activity .ai-chat-log,
body.spark-activity .ai-chat-item,
body.spark-activity .footnav {
  border-color: var(--spark-border);
}

body.spark-activity .ai-chat-meta,
body.spark-activity .intro-container p {
  color: var(--spark-text-soft);
}

body.spark-activity .ai-notebook textarea {
  color: var(--spark-text);
}

body.spark-activity .add-to-note-btn {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
}

body.spark-activity .intro-container {
  width: min(960px, calc(100% - 32px));
  margin: 36px auto;
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--spark-border);
  border-radius: 26px;
  background: var(--spark-surface);
  box-shadow: var(--spark-shadow);
}

body.spark-activity .intro-container h1 {
  color: var(--spark-accent);
  text-shadow: none;
}

/* AI dialog */
body.spark-ai {
  min-height: 100dvh;
  height: auto;
  padding: 18px;
  align-items: stretch;
}

body.spark-ai .spark-theme-toggle {
  top: 18px;
}

body.spark-ai .modal {
  display: grid;
  grid-template-columns: minmax(240px, .72fr) minmax(0, 1.55fr);
  width: min(1120px, 100%);
  max-width: none;
  height: calc(100dvh - 36px);
  max-height: none;
  margin: auto;
  padding: 16px;
  gap: 16px;
  border-color: var(--spark-border);
  border-radius: 24px;
  color: var(--spark-text);
  background: var(--spark-surface);
  box-shadow: var(--spark-shadow);
}

body.spark-ai .left {
  min-width: 0;
  padding: 22px 18px;
  border: 1px solid var(--spark-border);
  border-radius: 18px;
  background: linear-gradient(160deg, var(--spark-surface-soft), var(--spark-surface-solid));
}

body.spark-ai .left img {
  width: min(100%, 320px);
  max-height: min(48dvh, 390px);
  object-fit: contain;
  border-radius: 18px;
  filter: drop-shadow(0 16px 18px rgba(15, 23, 42, .12));
}

body.spark-ai .left h3 {
  color: var(--spark-accent);
  font-size: 1.45rem;
}

body.spark-ai .right {
  display: flex;
  min-width: 0;
  min-height: 0;
  flex-direction: column;
  padding-top: 54px;
}

body.spark-ai .roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(115px, 1fr));
  flex: 0 0 auto;
  gap: 9px;
  overflow: visible;
}

body.spark-ai .role {
  min-width: 0;
  padding: 11px 9px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
  border-radius: 12px;
}

body.spark-ai .role:hover,
body.spark-ai .role.active {
  border-color: var(--spark-accent);
  background: var(--spark-accent-soft);
}

body.spark-ai .log {
  min-height: 180px;
  color: var(--spark-text);
  background: color-mix(in srgb, var(--spark-surface-soft) 70%, transparent);
  border: 1px solid var(--spark-border);
  border-radius: 16px;
}

body.spark-ai .msg {
  max-width: min(88%, 720px);
  line-height: 1.7;
}

body.spark-ai .msg.user {
  color: #fff;
  background: linear-gradient(135deg, var(--spark-user-start), var(--spark-user-end));
  box-shadow: var(--spark-shadow-soft);
}

body.spark-ai .msg.ai {
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
}

body.spark-ai .input {
  flex: 0 0 auto;
}

body.spark-ai textarea {
  min-height: 64px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border-strong);
}

body.spark-ai #send {
  align-self: stretch;
  min-width: 72px;
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  border-color: var(--spark-accent);
  cursor: pointer;
}

/* Forum */
body.spark-forum header {
  position: sticky;
  z-index: 100;
  top: 0;
  min-height: 64px;
  padding: 9px max(22px, calc((100vw - 1460px) / 2));
}

body.spark-forum header img {
  width: auto;
  height: 48px;
  max-width: min(130px, 30vw);
}

body.spark-forum .banner {
  padding: clamp(30px, 5vw, 58px) max(22px, calc((100vw - 1420px) / 2));
  color: var(--spark-text);
  background:
    linear-gradient(115deg, var(--spark-glow-a), transparent 52%),
    var(--spark-surface-soft);
  border-color: var(--spark-border);
}

body.spark-forum .banner h1 {
  max-width: 940px;
  margin: 0 0 10px;
  font-size: clamp(1.65rem, 4vw, 2.7rem);
  letter-spacing: -.02em;
}

body.spark-forum .banner p {
  max-width: 760px;
  margin: 0;
  color: var(--spark-text-soft);
  line-height: 1.7;
}

body.spark-forum .container {
  grid-template-columns: 230px minmax(360px, 1fr) minmax(300px, 380px);
  width: min(1460px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 34px;
  gap: 16px;
}

body.spark-forum .sidebar,
body.spark-forum .main,
body.spark-forum .log {
  min-width: 0;
  border-color: var(--spark-border);
  border-radius: 20px;
  color: var(--spark-text);
  background: var(--spark-surface);
  box-shadow: var(--spark-shadow-soft);
}

body.spark-forum .role-btn,
body.spark-forum .utterance,
body.spark-forum .arg-btn,
body.spark-forum .action {
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border);
}

body.spark-forum .role-btn {
  min-height: 50px;
  padding: 11px 13px;
  text-align: left;
  border-left: 4px solid var(--spark-secondary);
}

body.spark-forum .role-btn:hover:not(:disabled),
body.spark-forum .arg-btn:hover:not(:disabled),
body.spark-forum .action:hover:not(:disabled) {
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  border-color: var(--spark-accent);
}

body.spark-forum .utterance {
  line-height: 1.75;
}

body.spark-forum .utterance:hover,
body.spark-forum .utterance.selected {
  color: var(--spark-text);
  background: var(--spark-accent-soft);
  border-color: var(--spark-accent);
}

body.spark-forum .avatar {
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--spark-border);
}

body.spark-forum .avatar-art {
  position: relative;
  display: grid;
  flex: 0 0 56px;
  place-items: center;
  width: 56px;
  height: 56px;
  overflow: hidden;
  border: 1px solid var(--spark-border);
  border-radius: 16px;
  color: var(--spark-accent-contrast);
  background: linear-gradient(135deg, var(--spark-accent), var(--spark-secondary));
  font-weight: 800;
}

body.spark-forum .avatar-art img {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 0;
  border-radius: 0;
}

body.spark-forum textarea {
  height: 120px;
  min-height: 120px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border-color: var(--spark-border-strong);
}

body.spark-forum blockquote {
  color: var(--spark-text);
  background: var(--spark-accent-soft);
  border-color: var(--spark-accent);
}

body.spark-forum .hint,
body.spark-forum .log-item h4 {
  color: var(--spark-text-soft);
}

body.spark-forum .log-item {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--spark-border);
}

body.spark-forum .log-item [id^="reply-"] > div {
  color: var(--spark-accent-strong) !important;
}

/* AI records */
body.spark-records header {
  min-height: 64px;
  padding: 18px max(22px, calc((100vw - 1180px) / 2));
  color: var(--spark-text);
  font-size: 1.1rem;
}

body.spark-records main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .8fr);
  width: min(1180px, calc(100% - 32px));
  height: auto;
  min-height: calc(100vh - 104px);
  margin: 20px auto;
  overflow: hidden;
  border: 1px solid var(--spark-border);
  border-radius: 22px;
  background: var(--spark-surface);
  box-shadow: var(--spark-shadow-soft);
}

body.spark-records .log,
body.spark-records .note {
  padding: 20px;
}

body.spark-records .log,
body.spark-records .item {
  border-color: var(--spark-border);
}

body.spark-records .item {
  padding: 12px;
  border: 1px solid var(--spark-border);
  border-radius: 12px;
  background: var(--spark-surface-solid);
}

body.spark-records .item strong {
  color: var(--spark-accent);
}

body.spark-records .item button {
  margin-top: 10px;
  padding: 6px 10px;
  color: var(--spark-accent-contrast);
  background: var(--spark-accent);
  border-radius: 8px;
}

body.spark-records .note {
  background: var(--spark-surface-soft);
}

body.spark-records textarea {
  min-height: 480px;
  padding: 16px;
  color: var(--spark-text);
  background: var(--spark-surface-solid);
  border: 1px solid var(--spark-border);
  border-radius: 14px;
}

:root[data-spark-theme="focus"] body.spark-student-page {
  background-image: none;
}

:root[data-spark-theme="focus"] body.spark-student-page .card,
:root[data-spark-theme="focus"] body.spark-student-page .info,
:root[data-spark-theme="focus"] body.spark-student-page .modal,
:root[data-spark-theme="focus"] body.spark-student-page .sidebar,
:root[data-spark-theme="focus"] body.spark-student-page .main,
:root[data-spark-theme="focus"] body.spark-student-page .log {
  border-width: 2px;
}

@media (max-width: 1180px) {
  body.spark-activity .page {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  body.spark-activity .page > .card:nth-child(3) {
    grid-column: 2;
    min-height: 520px;
  }

  body.spark-forum .container {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  body.spark-forum .log {
    grid-column: 2;
  }
}

@media (max-width: 820px) {
  .spark-theme-toggle {
    top: auto;
    right: 14px;
    bottom: 14px;
  }

  body.spark-home .rightBox,
  body.spark-activity .auth {
    padding-right: 0;
  }

  body.spark-home header {
    position: static;
  }

  body.spark-home .logo-container {
    min-width: 0;
  }

  body.spark-home .main-title {
    white-space: normal;
  }

  body.spark-ai {
    padding: 10px;
  }

  body.spark-ai .spark-theme-toggle {
    top: auto;
  }

  body.spark-ai .modal {
    grid-template-columns: 1fr;
    height: auto;
    min-height: calc(100dvh - 20px);
  }

  body.spark-ai .left {
    display: grid;
    grid-template-columns: 100px 1fr;
    grid-template-rows: auto auto;
    column-gap: 14px;
    justify-items: start;
    padding: 12px;
  }

  body.spark-ai .left img {
    grid-row: 1 / 3;
    width: 100px;
    max-height: 120px;
  }

  body.spark-ai .left h3 {
    align-self: end;
    margin: 0;
  }

  body.spark-ai .right {
    min-height: 520px;
    padding-top: 0;
  }
}

@media (max-width: 680px) {
  .spark-theme-dialog {
    width: min(100% - 18px, 520px);
    max-height: calc(100dvh - 18px);
    padding: 18px;
    border-radius: 18px;
  }

  .spark-theme-options {
    grid-template-columns: 1fr;
  }

  .spark-theme-option {
    min-height: 104px;
  }

  body.spark-home main {
    width: min(100% - 22px, 1240px);
  }

  body.spark-home #activityGrid {
    grid-template-columns: 1fr;
  }

  body.spark-activity header {
    align-items: flex-start;
    flex-direction: column;
    padding: 10px 14px;
  }

  body.spark-activity .auth {
    width: 100%;
    justify-content: space-between;
  }

  body.spark-activity .page,
  body.spark-forum .container {
    display: grid;
    grid-template-columns: 1fr;
    width: min(100% - 20px, 1500px);
  }

  body.spark-activity .page > .card:nth-child(3),
  body.spark-forum .log {
    grid-column: 1;
  }

  body.spark-activity .page > .card:first-child .body {
    overflow-x: auto;
  }

  body.spark-activity .stepper {
    min-width: max-content;
    flex-direction: row;
  }

  body.spark-activity .chip {
    width: auto;
    min-width: 140px;
  }

  body.spark-forum .banner {
    padding: 28px 16px;
  }

  body.spark-forum .container {
    padding: 12px 0 30px;
  }

  body.spark-forum .sidebar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  body.spark-forum .role-btn {
    margin: 0;
  }

  body.spark-ai .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body.spark-ai .msg {
    max-width: 96%;
  }

  body.spark-records main {
    grid-template-columns: 1fr;
  }

  body.spark-records .log {
    border-right: 0;
    border-bottom: 1px solid var(--spark-border);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}