:root {
  --ink: #10242b;
  --muted: #61727a;
  --line: #d8e5df;
  --paper: #ffffff;
  --soft: #f3f7f5;
  --mist: #e9f2ef;
  --green: #13966f;
  --green-dark: #0c6f54;
  --blue: #236f9f;
  --amber: #b98218;
  --red: #b84a4a;
  --shadow: 0 18px 44px rgba(16, 36, 43, .09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.huanyu-app {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
}

body.huanyu-app a {
  color: inherit;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(320px, 520px) minmax(280px, 1fr);
  gap: 22px;
  align-items: stretch;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0;
}

.login-card,
.login-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.login-card {
  padding: 30px;
}

.login-brand {
  margin-bottom: 28px;
}

.login-copy h1 {
  margin: 0;
  color: var(--ink);
  font-size: 36px;
  line-height: 1.18;
  letter-spacing: 0;
}

.login-copy p {
  color: var(--muted);
  line-height: 1.72;
}

.login-form {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.login-form label {
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}

.login-form input,
.login-form select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--ink);
  background: #fbfdfc;
  font: inherit;
}

.login-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.login-check input {
  width: 16px;
  min-height: 16px;
}

.login-message {
  min-height: 24px;
  margin: 4px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.login-message.is-error {
  color: var(--red);
}

.login-message.is-success {
  color: var(--green-dark);
}

.login-submit {
  width: 100%;
  margin-top: 4px;
}

.login-shortcuts {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

.login-game-entry {
  width: 100%;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 16px;
  border: 1px solid rgba(48, 242, 180, .28);
  border-radius: 8px;
  background: rgba(48, 242, 180, .08);
  color: var(--green-dark);
  font-weight: 900;
  text-decoration: none;
}

.login-panel {
  position: relative;
  display: grid;
  align-content: end;
  gap: 12px;
  overflow: hidden;
  padding: min(46vh, 340px) 28px 28px;
  background:
    linear-gradient(135deg, rgba(16, 36, 43, .92), rgba(18, 88, 72, .72)),
    url("../../img/homepage-bg.png") center/cover no-repeat;
}

.login-panel-logo {
  position: absolute;
  top: 28px;
  left: 28px;
  right: 28px;
  z-index: 1;
  width: auto;
  height: min(34vh, 280px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 8px;
  background: rgba(255, 255, 255, .14);
  backdrop-filter: blur(14px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, .24);
}

.login-panel-logo img {
  width: min(72%, 260px);
  height: min(72%, 260px);
  object-fit: contain;
  filter: drop-shadow(0 0 32px rgba(48, 242, 180, .48));
}

.login-panel div {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 8px;
  background: rgba(255, 255, 255, .13);
}

.login-panel span {
  display: block;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, .72);
  font-size: 12px;
  font-weight: 800;
}

.login-panel strong {
  color: #fff;
  font-size: 22px;
  line-height: 1.35;
}

.app-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.app-nav {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
}

.brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.nav-links a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 8px;
  color: #38505a;
  text-decoration: none;
  font-size: 14px;
}

.nav-links a.active,
.nav-links a:hover {
  background: var(--mist);
  color: var(--green-dark);
}

.nav-action {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border: 1px solid var(--green);
  border-radius: 8px;
  color: #fff;
  background: var(--green);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}

.nav-user-menu {
  position: relative;
  flex: 0 0 auto;
}

.nav-user-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--green);
  border-radius: 8px;
  color: #fff;
  background: var(--green);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
}

.nav-user-button small {
  max-width: 96px;
  overflow: hidden;
  color: rgba(255, 255, 255, .82);
  font-size: 12px;
  font-weight: 700;
  text-overflow: ellipsis;
}

.nav-user-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 40;
  width: 240px;
  display: none;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.nav-user-menu.is-open .nav-user-dropdown,
.nav-user-menu:focus-within .nav-user-dropdown {
  display: block;
}

.nav-user-summary {
  padding: 10px 10px 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 6px;
}

.nav-user-summary span,
.nav-user-summary small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.nav-user-summary strong {
  display: block;
  margin: 4px 0;
  color: var(--ink);
  font-size: 16px;
  word-break: break-all;
}

.nav-user-dropdown a,
.nav-user-dropdown button {
  width: 100%;
  min-height: 38px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border: 0;
  border-radius: 8px;
  color: #38505a;
  background: transparent;
  font: inherit;
  font-size: 14px;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.nav-user-dropdown a:hover,
.nav-user-dropdown button:hover {
  background: var(--mist);
  color: var(--green-dark);
}

.page-main {
  padding: 28px 0 46px;
}

.hero-panel {
  position: relative;
  min-height: 360px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  gap: 28px;
  align-items: stretch;
  overflow: hidden;
  margin-bottom: 24px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(16, 36, 43, .92), rgba(18, 88, 72, .74)),
    url("../../img/homepage-bg.png") center/cover no-repeat;
  color: #fff;
}

.hero-copy {
  padding: 42px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: #a8e5c9;
  font-size: 13px;
  font-weight: 800;
}

.hero-copy h1,
.page-title h1 {
  margin: 0;
  font-size: 42px;
  line-height: 1.18;
  letter-spacing: 0;
}

.hero-copy p,
.page-title p,
.card p,
.panel p {
  color: var(--muted);
  line-height: 1.72;
}

.hero-copy .lead {
  max-width: 640px;
  margin: 18px 0 0;
  color: rgba(255, 255, 255, .84);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.button,
button.button,
.upload-button,
.ghost-button,
#translate-button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 16px;
  border: 1px solid var(--green);
  border-radius: 8px;
  background: var(--green);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button.secondary,
.ghost-button {
  background: #fff;
  color: var(--green-dark);
}

.button:disabled,
button:disabled {
  cursor: not-allowed;
  opacity: .58;
}

.hero-visual {
  padding: 28px;
  display: flex;
  align-items: center;
}

.signal-board {
  width: 100%;
  min-height: 270px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.signal-board div {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 8px;
  background: rgba(255, 255, 255, .13);
}

.signal-board span,
.metric-card span,
.panel-heading span,
.result-box label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.signal-board strong {
  color: #fff;
  font-size: 22px;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 22px 0;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
  align-items: start;
}

.card,
.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.card h2,
.panel-heading strong,
.result-box strong {
  overflow-wrap: anywhere;
}

.card {
  padding: 22px;
}

.card h2,
.panel h2 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.35;
}

.card-icon {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  border-radius: 8px;
  background: var(--mist);
  color: var(--green-dark);
  font-size: 20px;
}

.game-card {
  overflow: hidden;
}

.game-card::after {
  content: "";
  position: absolute;
  inset: auto -20% -44% 22%;
  height: 130px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(48, 242, 180, .18), transparent 62%);
}

.panel {
  padding: 20px;
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.panel-heading strong {
  color: var(--green-dark);
}

.page-title {
  margin-bottom: 20px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.status-list,
.activity-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.status-list li,
.activity-list li {
  padding: 12px;
  border: 1px solid #e6efeb;
  border-radius: 8px;
  background: #fbfdfc;
}

.status-list strong,
.activity-list strong {
  display: block;
  color: var(--ink);
}

.status-list small,
.activity-list small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
}

.study-dashboard {
  margin-bottom: 22px;
}

.study-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.study-metrics div {
  min-width: 0;
  padding: 14px;
  border: 1px solid #e2ece7;
  border-radius: 8px;
  background: #fbfdfc;
}

.study-metrics span,
.study-progress-list small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.study-metrics strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-size: 24px;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.study-metrics small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.45;
}

.study-progress-list {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.study-progress-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid #e6efeb;
  border-left-width: 4px;
  border-radius: 8px;
  background: #fbfdfc;
}

.study-progress-list li.is-pass {
  border-left-color: var(--green);
}

.study-progress-list li.is-warn {
  border-left-color: var(--amber);
}

.study-progress-list li.is-fail {
  border-left-color: var(--red);
}

.study-progress-list strong {
  color: var(--ink);
  overflow-wrap: anywhere;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--mist);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
}

.badge.warn {
  background: #fff4d6;
  color: var(--amber);
}

.badge.danger {
  background: #ffe9e9;
  color: var(--red);
}

.translate-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  gap: 18px;
  align-items: start;
}

.capture-panel,
.result-panel,
.side-panel,
.history-panel {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.capture-panel,
.result-panel {
  border-top: 4px solid transparent;
}

.capture-panel.is-ready {
  border-top-color: var(--green);
}

.capture-panel.is-error,
.result-panel.is-error {
  border-top-color: var(--red);
}

.result-panel.is-success {
  border-top-color: var(--green);
}

.result-panel.is-warning {
  border-top-color: var(--amber);
}

.result-panel.is-error .result-toolbar strong,
.capture-panel.is-error .panel-heading strong {
  color: var(--red);
}

.result-panel.is-warning .result-toolbar strong {
  color: var(--amber);
}

.video-frame {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 8px;
  background: #10242b;
}

.video-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 10px;
  color: rgba(255, 255, 255, .7);
}

#video-input {
  display: none;
}

.capture-meta,
.result-toolbar,
.confidence-strip,
.voice-panel {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.translate-status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.translate-status-grid div {
  min-width: 0;
  padding: 12px;
  border: 1px solid #e2ece7;
  border-radius: 8px;
  background: #fbfdfc;
}

.translate-status-grid span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.translate-status-grid strong {
  display: block;
  color: var(--ink);
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.realtime-panel {
  margin-top: 14px;
  padding: 14px;
  border: 1px solid #e2ece7;
  border-radius: 8px;
  background: #fbfdfc;
}

.realtime-actions {
  gap: 10px;
  margin-top: 10px !important;
}

.realtime-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.realtime-output {
  min-width: 0;
  padding: 12px;
  border: 1px solid #e6efeb;
  border-radius: 8px;
  background: #fff;
}

.realtime-output span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.realtime-output strong {
  display: block;
  color: var(--ink);
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.translation-output {
  min-height: 96px;
  padding: 16px;
  border-radius: 8px;
  background: #f4f8f6;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.55;
}

.gloss-row,
.quality-row,
.reference-row,
.result-box {
  margin-top: 12px;
  padding: 12px;
  border: 1px solid #e2ece7;
  border-radius: 8px;
  background: #fbfdfc;
}

.confidence-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.voice-control {
  display: grid;
  gap: 6px;
  flex: 1;
}

.voice-control select {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
}

.demo-sample-list,
.history-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.demo-sample-list li,
.history-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  border: 1px solid #e6efeb;
  border-radius: 8px;
  background: #fbfdfc;
}

.demo-sample-list li.sample-offline {
  border-color: #f0c8c8;
  background: #fff8f8;
}

.demo-sample-list small,
.history-list small {
  color: var(--muted);
  line-height: 1.45;
}

.demo-sample-list button,
.secondary-action,
.analysis-button,
.alert-button {
  min-height: 34px;
  border: 1px solid var(--green);
  border-radius: 8px;
  background: #fff;
  color: var(--green-dark);
  font-weight: 800;
}

.course-shell {
  display: grid;
  gap: 18px;
}

.course-title {
  max-width: 780px;
}

.course-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.course-tabs,
.course-search {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.course-tabs button,
.course-search button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 14px;
  background: #fff;
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.course-tabs button.active,
.course-search button {
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}

.course-search {
  min-width: min(420px, 100%);
  padding-left: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.course-search i {
  color: var(--muted);
}

.course-search input {
  min-width: 0;
  min-height: 38px;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
}

.course-overview {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.course-overview div {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.course-overview span,
.course-gloss span,
.course-card-meta span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.course-overview strong {
  display: block;
  margin-top: 6px;
  font-size: 22px;
  overflow-wrap: anywhere;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.course-card,
.course-loading {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.course-card {
  overflow: hidden;
}

.course-video {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #10242b;
}

.course-video video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.course-card-body {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.course-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.course-card-meta strong {
  color: var(--green-dark);
  overflow-wrap: anywhere;
}

.course-card h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.45;
}

.course-gloss {
  padding: 12px;
  border: 1px solid #e2ece7;
  border-radius: 8px;
  background: #fbfdfc;
}

.course-gloss p,
.course-note {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.course-card-actions,
.course-footer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.course-footer-actions {
  justify-content: center;
}

.course-loading {
  grid-column: 1 / -1;
  padding: 28px;
  color: var(--muted);
  text-align: center;
}

.course-loading.is-error {
  color: var(--red);
}

.app-footer {
  padding: 22px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

@media (max-width: 960px) {
  .login-shell,
  .hero-panel,
  .two-col,
  .translate-workspace {
    grid-template-columns: 1fr;
  }

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

  .course-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

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

@media (max-width: 640px) {
  .login-shell {
    width: min(100% - 20px, 1120px);
    padding: 20px 0;
  }

  .login-card,
  .login-panel {
    padding: 22px;
  }

  .login-panel {
    padding-top: 220px;
  }

  .login-panel-logo {
    top: 22px;
    left: 22px;
    right: 22px;
    width: auto;
    height: 176px;
  }

  .login-panel-logo img {
    width: 136px;
    height: 136px;
  }

  .login-copy h1 {
    font-size: 30px;
  }

  .app-shell {
    width: min(100% - 20px, 1180px);
  }

  .app-nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
  }

  .nav-links {
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: thin;
  }

  .nav-links a {
    flex: 0 0 auto;
  }

  .nav-action {
    width: 100%;
  }

  .hero-copy,
  .hero-visual {
    padding: 22px;
  }

  .hero-copy h1,
  .page-title h1 {
    font-size: 30px;
  }

  .section-grid,
  .confidence-strip,
  .signal-board,
  .study-metrics,
  .realtime-grid,
  .translate-status-grid,
  .course-overview {
    grid-template-columns: 1fr;
  }

  .study-progress-list li {
    align-items: flex-start;
    flex-direction: column;
  }

  .capture-meta {
    align-items: stretch;
    flex-direction: column;
  }

  .capture-meta .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .hero-actions .button,
  .hero-actions .upload-button,
  .hero-actions .ghost-button,
  .hero-actions #translate-button {
    width: 100%;
  }
}

/* ========================================================
   Premium Sci-Fi Visual Layer
   Keeps the existing markup and behavior intact.
   ======================================================== */

:root {
  --ink: #e7fbf7;
  --muted: #8ea7a9;
  --line: rgba(100, 255, 218, .18);
  --paper: rgba(9, 20, 24, .82);
  --soft: #061013;
  --mist: rgba(78, 255, 201, .1);
  --green: #30f2b4;
  --green-dark: #68ffd5;
  --blue: #43b7ff;
  --amber: #f1c66d;
  --red: #ff6b7a;
  --shadow: 0 24px 70px rgba(0, 0, 0, .34), inset 0 1px 0 rgba(255, 255, 255, .045);
  --panel-glass: linear-gradient(145deg, rgba(12, 26, 31, .9), rgba(8, 16, 20, .78));
  --panel-edge: linear-gradient(135deg, rgba(48, 242, 180, .54), rgba(67, 183, 255, .18), rgba(241, 198, 109, .22));
  --tech-grid: linear-gradient(rgba(48, 242, 180, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(67, 183, 255, .045) 1px, transparent 1px);
}

body.huanyu-app {
  min-height: 100vh;
  background:
    linear-gradient(115deg, rgba(48, 242, 180, .07), transparent 26%),
    linear-gradient(245deg, rgba(241, 198, 109, .055), transparent 30%),
    var(--tech-grid),
    linear-gradient(180deg, #071316 0%, #0b1115 48%, #081013 100%);
  background-size: auto, auto, 34px 34px, auto;
}

body.huanyu-app::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, transparent 0 78px, rgba(48, 242, 180, .035) 78px 79px),
    repeating-linear-gradient(0deg, transparent 0 118px, rgba(241, 198, 109, .025) 118px 119px);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .9), rgba(0, 0, 0, .16));
}

.app-topbar {
  border-bottom-color: rgba(48, 242, 180, .24);
  background: rgba(4, 14, 17, .78);
  box-shadow: 0 12px 36px rgba(0, 0, 0, .26);
}

.brand span,
.nav-user-summary strong,
.status-list strong,
.activity-list strong,
.study-progress-list strong,
.translate-status-grid strong,
.realtime-output strong {
  color: var(--ink);
}

.brand img {
  filter: drop-shadow(0 0 14px rgba(48, 242, 180, .38));
}

.nav-links a,
.nav-user-dropdown a,
.nav-user-dropdown button {
  color: #a9c1c1;
}

.nav-links a.active,
.nav-links a:hover,
.nav-user-dropdown a:hover,
.nav-user-dropdown button:hover {
  background: rgba(48, 242, 180, .11);
  color: #d9fff6;
  box-shadow: inset 0 0 0 1px rgba(48, 242, 180, .18);
}

.nav-action,
.nav-user-button,
.button,
button.button,
.upload-button,
#translate-button,
.course-tabs button.active,
.course-search button {
  border-color: rgba(48, 242, 180, .56);
  background:
    linear-gradient(135deg, rgba(48, 242, 180, .95), rgba(31, 175, 255, .82));
  color: #041010;
  box-shadow: 0 12px 34px rgba(48, 242, 180, .16);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.nav-action:hover,
.nav-user-button:hover,
.button:hover,
button.button:hover,
.upload-button:hover,
#translate-button:hover,
.course-tabs button.active:hover,
.course-search button:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 42px rgba(48, 242, 180, .24);
}

.button.secondary,
.ghost-button,
.demo-sample-list button,
.secondary-action,
.analysis-button,
.alert-button,
.course-tabs button {
  border-color: rgba(48, 242, 180, .28);
  background: rgba(8, 19, 23, .72);
  color: #bfffee;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .04);
}

.page-title,
.card,
.panel,
.login-card,
.login-panel,
.capture-panel,
.result-panel,
.side-panel,
.history-panel,
.course-toolbar,
.course-overview div,
.course-card,
.course-loading,
.nav-user-dropdown,
.demo-sample-list li,
.history-list li,
.status-list li,
.activity-list li,
.study-metrics div,
.study-progress-list li,
.translate-status-grid div,
.realtime-panel,
.realtime-output,
.course-gloss {
  position: relative;
  border-color: rgba(48, 242, 180, .18);
  background: var(--panel-glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(130%);
}

.page-title::before,
.card::before,
.panel::before,
.course-card::before,
.capture-panel::before,
.result-panel::before,
.side-panel::before,
.history-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  pointer-events: none;
  background: var(--panel-edge);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: .55;
}

.hero-panel,
.login-panel {
  background:
    linear-gradient(135deg, rgba(3, 13, 16, .92), rgba(6, 33, 36, .8)),
    var(--tech-grid),
    url("../../img/homepage-bg.png") center/cover no-repeat;
  background-size: auto, 28px 28px, cover;
  box-shadow: 0 28px 84px rgba(0, 0, 0, .34);
}

.hero-panel::after,
.course-video::after,
.video-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(105deg, transparent 0 42%, rgba(48, 242, 180, .16) 48%, transparent 56% 100%);
  transform: translateX(-115%);
  animation: hy-scan 7s ease-in-out infinite;
}

.hero-copy h1,
.page-title h1 {
  color: #f1fffb;
  text-shadow: 0 0 22px rgba(48, 242, 180, .16);
}

.hero-copy p,
.page-title p,
.card p,
.panel p,
.course-gloss p,
.course-note,
.login-copy p,
.status-list small,
.activity-list small,
.study-metrics small,
.study-progress-list small,
.demo-sample-list small,
.history-list small {
  color: var(--muted);
}

.eyebrow,
.panel-heading span,
.metric-card span,
.signal-board span,
.course-overview span,
.course-gloss span,
.course-card-meta span,
.translate-status-grid span,
.realtime-output span,
.result-box label,
.login-panel span {
  color: #7ef9d3;
}

.panel-heading strong,
.course-card-meta strong,
.course-overview strong,
.card-icon,
.badge {
  color: var(--green-dark);
}

.card-icon,
.badge,
.translation-output,
.video-empty {
  background: rgba(48, 242, 180, .1);
}

.game-card {
  border-color: rgba(240, 171, 252, .24);
  background:
    radial-gradient(circle at 78% 20%, rgba(240, 171, 252, .12), transparent 34%),
    radial-gradient(circle at 20% 92%, rgba(48, 242, 180, .13), transparent 38%),
    var(--panel-glass);
}

.game-card .card-icon,
.login-game-entry {
  border-color: rgba(240, 171, 252, .28);
  background: linear-gradient(135deg, rgba(48, 242, 180, .13), rgba(240, 171, 252, .12));
  color: #eafffb;
  box-shadow: inset 0 0 24px rgba(48, 242, 180, .06), 0 0 30px rgba(240, 171, 252, .08);
}

.login-game-entry {
  margin-top: 4px;
}

/* Light-surface contrast correction */
.community-category-tab,
.community-modal,
.community-modal input,
.community-modal textarea,
.community-modal select,
.community-reply-form,
.community-reply-form textarea,
.community-toast,
.demo-sample-list li.sample-offline,
.badge.warn,
.badge.danger {
  color: #10242b;
}

.community-post-card-title,
.community-modal h2,
.community-modal label,
.community-detail-header h1,
.community-reply-section h3,
.community-empty h3,
.community-reply-toast strong {
  color: #0a1f25;
}

.community-post-card-excerpt,
.community-post-meta,
.community-empty,
.community-empty p,
.community-card-delete,
.community-reply-card .reply-actions button,
.community-reply-toast,
.community-modal input::placeholder,
.community-modal textarea::placeholder,
.community-reply-form textarea::placeholder {
  color: #445c65;
}

.community-category-tab:hover,
.community-reply-card .reply-actions button:hover {
  color: #0c6f54;
}

/* Match remaining small surfaces to the sci-fi glass system */
.login-form input,
.login-form select,
.nav-user-dropdown,
.button.secondary,
.ghost-button,
.card,
.panel,
.page-title,
.status-list li,
.activity-list li,
.study-metrics div,
.study-progress-list li,
.badge.warn,
.capture-panel,
.result-panel,
.side-panel,
.history-panel,
.translate-status-grid div,
.realtime-panel,
.realtime-output,
.translation-output,
.result-box,
.demo-sample-list li,
.history-list li,
.demo-sample-list li.sample-offline,
.demo-sample-list button,
.course-toolbar,
.course-tabs button,
.course-search,
.course-overview div,
.course-card,
.course-loading,
.course-gloss,
.community-category-tab,
.community-post-card,
.community-modal,
.community-modal input,
.community-modal textarea,
.community-modal select,
.community-reply-form,
.community-reply-form textarea,
.community-toast {
  border-color: rgba(48, 242, 180, .18);
  background:
    linear-gradient(145deg, rgba(12, 26, 31, .9), rgba(8, 16, 20, .78));
  color: var(--ink);
  box-shadow: var(--shadow);
}

.community-modal input,
.community-modal textarea,
.community-modal select,
.community-reply-form textarea,
.login-form input,
.login-form select,
.course-search input {
  color: #e7fbf7;
}

.community-post-card-title,
.community-modal h2,
.community-modal label,
.community-detail-header h1,
.community-reply-section h3,
.community-empty h3,
.community-reply-toast strong,
.community-post-card-excerpt,
.community-post-meta,
.community-empty,
.community-empty p,
.community-card-delete,
.community-reply-card .reply-actions button,
.community-reply-toast,
.community-category-tab,
.badge.warn,
.badge.danger {
  color: #d9fff6;
}

.community-post-card-excerpt,
.community-post-meta,
.community-empty p,
.community-reply-toast,
.community-card-delete,
.community-modal input::placeholder,
.community-modal textarea::placeholder,
.community-reply-form textarea::placeholder {
  color: #8ea7a9;
}

.community-category-tab:hover,
.community-reply-card .reply-actions button:hover {
  color: #68ffd5;
}

/* Translate page right-side module harmonization */
.side-panel .result-box,
.history-panel .result-box,
.side-panel .demo-sample-list li,
.history-panel .history-list li,
.result-panel .translation-output,
.result-panel .gloss-row,
.result-panel .quality-row,
.result-panel .reference-row,
.result-panel .confidence-strip > div,
.result-panel .voice-panel,
.voice-control select {
  border-color: rgba(48, 242, 180, .18);
  background:
    linear-gradient(145deg, rgba(12, 26, 31, .9), rgba(8, 16, 20, .78));
  color: #e7fbf7;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .035), 0 18px 42px rgba(0, 0, 0, .18);
}

.side-panel .result-box label,
.history-panel .result-box label,
.result-panel .gloss-row span,
.result-panel .quality-row span,
.result-panel .reference-row span,
.result-panel .confidence-strip span,
.voice-control label,
.demo-sample-list small,
.history-list small {
  color: #7ef9d3;
}

.side-panel .result-box strong,
.history-panel .result-box strong,
.side-panel .demo-sample-list strong,
.history-panel .history-list strong,
.result-panel .translation-output,
.result-panel .gloss-row p,
.result-panel .quality-row p,
.result-panel .quality-row strong,
.result-panel .reference-row p,
.result-panel .reference-row small,
.result-panel .confidence-strip strong {
  color: #f4fffc;
}

.signal-board div {
  border-color: rgba(255, 255, 255, .16);
  background: rgba(7, 19, 23, .6);
  box-shadow: inset 0 0 30px rgba(48, 242, 180, .055);
}

.signal-board strong,
.study-metrics strong,
.course-card h2,
.login-panel strong,
.translation-output {
  color: #f4fffc;
}

.course-search,
.login-form input,
.login-form select {
  border-color: rgba(48, 242, 180, .22);
  background: rgba(4, 13, 16, .72);
  color: var(--ink);
}

.course-search input::placeholder,
.login-form input::placeholder {
  color: rgba(142, 167, 169, .78);
}

.course-card {
  overflow: hidden;
}

.course-video,
.video-frame {
  background:
    linear-gradient(135deg, rgba(48, 242, 180, .12), rgba(67, 183, 255, .07)),
    #050d10;
}

.course-video video,
.video-frame video {
  filter: saturate(1.08) contrast(1.04);
}

.capture-panel.is-ready,
.result-panel.is-success {
  border-top-color: var(--green);
  box-shadow: 0 24px 70px rgba(48, 242, 180, .08), var(--shadow);
}

.capture-panel.is-error,
.result-panel.is-error {
  border-top-color: var(--red);
}

.result-panel.is-warning {
  border-top-color: var(--amber);
}

.app-footer {
  border-top-color: rgba(48, 242, 180, .18);
  color: rgba(142, 167, 169, .82);
}

@keyframes hy-scan {
  0%, 62% {
    transform: translateX(-115%);
    opacity: 0;
  }
  72% {
    opacity: 1;
  }
  100% {
    transform: translateX(115%);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-panel::after,
  .course-video::after,
  .video-frame::after {
    animation: none;
  }

  .nav-action:hover,
  .nav-user-button:hover,
  .button:hover,
  button.button:hover,
  .upload-button:hover,
  #translate-button:hover,
  .course-tabs button.active:hover,
  .course-search button:hover {
    transform: none;
  }
}

/* ========================================================
   Community / Discussion
   ======================================================== */

.community-action-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.community-action-bar .button {
  margin-right: auto;
}

.community-category-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.community-category-tab {
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  transition: background .18s, color .18s, border-color .18s;
  text-decoration: none;
}

.community-category-tab:hover {
  border-color: var(--green);
  color: var(--green-dark);
}

.community-category-tab.is-active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.community-post-card {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  text-decoration: none;
  color: var(--ink);
  transition: box-shadow .18s, border-color .18s;
  margin-bottom: 10px;
}

.community-post-card:hover {
  border-color: var(--green);
  box-shadow: 0 4px 16px rgba(16, 36, 43, .08);
}

.community-card-delete {
  position: absolute;
  top: 8px;
  right: 10px;
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 4px;
  opacity: 0;
  transition: opacity .15s, color .15s;
}
.community-post-card:hover .community-card-delete {
  opacity: 1;
}
.community-card-delete:hover {
  color: var(--red);
  background: rgba(220, 53, 69, .08);
}

.community-post-card {
  position: relative;
}

.community-post-card-title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}

.community-post-card-excerpt {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.community-post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--muted);
}

.community-post-meta .meta-author {
  font-weight: 600;
  color: var(--ink);
}

.community-post-meta .meta-dot {
  color: var(--line);
}

.community-category-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 700;
  background: var(--mist);
  color: var(--green-dark);
}

.community-category-tag.cat-bug {
  background: #fef0f0;
  color: var(--red);
}

.community-category-tag.cat-discussion {
  background: var(--mist);
  color: var(--green-dark);
}

.community-category-tag.cat-showcase {
  background: #eef5ff;
  color: var(--blue);
}

.community-empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
}

.community-empty h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 18px;
}

.community-empty p {
  margin: 0 auto 20px;
  max-width: 380px;
  line-height: 1.6;
}

.community-load-more {
  text-align: center;
  margin-top: 14px;
}

.community-load-more .button {
  min-width: 140px;
}

/* Modal overlay */
.community-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(16, 36, 43, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.community-modal-overlay[hidden] {
  display: none;
}

.community-modal {
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--paper);
  border-radius: 10px;
  box-shadow: 0 20px 60px rgba(16, 36, 43, .18);
  padding: 28px 24px;
}

.community-modal h2 {
  margin: 0 0 18px;
  font-size: 20px;
}

.community-modal label {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.community-modal input,
.community-modal textarea,
.community-modal select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  font: inherit;
  color: var(--ink);
  background: #fbfdfc;
  margin-bottom: 14px;
}

.community-modal textarea {
  min-height: 120px;
  resize: vertical;
}

.community-modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 6px;
}

/* Post detail page */
.community-detail-header {
  margin-bottom: 20px;
}

.community-detail-header .community-category-tag {
  margin-bottom: 8px;
}

.community-detail-header h1 {
  margin: 0 0 6px;
  font-size: 22px;
  line-height: 1.35;
}

.community-detail-body {
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 28px;
  white-space: pre-wrap;
  word-break: break-word;
}

.community-detail-body p {
  margin: 0 0 10px;
}

.community-reply-section {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 10px;
}

.community-reply-section h3 {
  margin: 0 0 14px;
  font-size: 16px;
}

.community-reply-card {
  padding: 14px 16px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.community-reply-card.is-nested {
  margin-left: 28px;
  border-left: 3px solid var(--green);
}

.community-reply-card .reply-content {
  margin: 0 0 8px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.community-reply-card .reply-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.community-reply-card .reply-actions button {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 4px;
}

.community-reply-card .reply-actions button:hover {
  color: var(--green-dark);
}

.community-reply-form {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.community-reply-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: #fbfdfc;
  min-height: 80px;
  resize: vertical;
  margin-bottom: 10px;
}

.community-reply-form .reply-form-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  align-items: center;
}

.community-reply-toast {
  font-size: 13px;
  color: var(--muted);
  margin-right: auto;
}

.community-reply-toast strong {
  color: var(--ink);
}

.community-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 2000;
  animation: toast-in .28s ease;
}

.community-toast.is-success {
  background: var(--green-dark);
  color: #fff;
}

.community-toast.is-error {
  background: var(--red);
  color: #fff;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(12px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Community modal contrast hardening */
.community-modal textarea#post-content {
  color: #071b20;
  background: #ffffff;
  border-color: #b9cbc6;
  caret-color: #0c6f54;
  font-weight: 500;
}

.community-modal textarea#post-content::placeholder {
  color: #4a6068;
  opacity: 1;
}