:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-muted: #eef2f6;
  --text: #1c2530;
  --muted: #687385;
  --line: #dce2ea;
  --primary: #1f7a63;
  --primary-strong: #17614f;
  --danger: #c94848;
  --success: #1f8f5f;
  --warning: #a66a00;
  --shadow: 0 18px 42px rgba(25, 35, 48, 0.08);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #171b20;
  --surface: #20262d;
  --surface-muted: #29313a;
  --text: #edf1f5;
  --muted: #aab4c0;
  --line: #3a444f;
  --primary: #43b58f;
  --primary-strong: #63c8a6;
  --danger: #ef7d7d;
  --success: #62d39c;
  --warning: #e4ac43;
  --shadow: 0 18px 42px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

button,
select,
input {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}

button {
  padding: 0 16px;
  cursor: pointer;
}

button.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
}

button.primary:hover,
.button-link.primary:hover {
  background: var(--primary-strong);
}

button.ghost {
  background: transparent;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

select {
  padding: 0 36px 0 12px;
}

input {
  padding: 0 12px;
}

a {
  color: var(--primary);
}

/* ---- Topbar & Navigation ---- */
.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 56px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--primary);
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--primary);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: var(--surface-muted);
  color: var(--text);
}

.nav-link.active {
  background: color-mix(in srgb, var(--primary) 12%, var(--surface));
  color: var(--primary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.mode-tabs {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.mode-tab {
  min-height: 36px;
  padding: 0 14px;
  border: none;
  border-radius: 0;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.mode-tab:not(:last-child) {
  border-right: 1px solid var(--line);
}

.mode-tab:hover {
  background: var(--surface-muted);
}

.mode-tab.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.icon-button {
  width: 42px;
  padding: 0;
}

#menuToggle {
  display: none;
}

@media (max-width: 780px) {
  .topbar-inner {
    height: 50px;
    padding: 0 16px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    right: 0;
    background: var(--surface);
    flex-direction: column;
    padding: 12px 16px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    gap: 4px;
  }

  .mobile-menu-open .main-nav {
    display: flex;
  }

  .nav-link {
    width: 100%;
    justify-content: center;
  }

  #menuToggle {
    display: inline-flex;
  }

  .mode-tab {
    min-height: 32px;
    padding: 0 10px;
    font-size: 12px;
  }
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 30px;
  line-height: 1.2;
}

.app-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 24px 34px;
}

.hidden {
  display: none !important;
}

/* ---- Page Header ---- */
.page-header {
  margin-bottom: 24px;
}

.page-header h2 {
  font-size: 24px;
  margin-bottom: 4px;
}

.page-header p {
  margin: 0;
}

/* ---- Notices ---- */
.notice,
.panel,
.exam-card,
.result-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.notice {
  padding: 16px;
  color: var(--muted);
}

/* ---- Home Dashboard ---- */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: 24px;
  align-items: stretch;
  margin-bottom: 28px;
}

.home-hero h1 {
  max-width: 760px;
  margin-bottom: 14px;
  font-size: 36px;
}

.hero-copy {
  max-width: 760px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

.button-link.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
}

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

.stat-item {
  min-height: 112px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.stat-item strong {
  display: block;
  margin-bottom: 8px;
  color: var(--primary);
  font-size: 34px;
  line-height: 1;
}

.stat-item span {
  color: var(--muted);
}

.section-block {
  margin-top: 28px;
}

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

.section-head h2 {
  margin-bottom: 4px;
  font-size: 22px;
}

.section-head p {
  margin-bottom: 0;
}

.compact-grid {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.series-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}

.series-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.series-item h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.series-item p {
  color: var(--muted);
  line-height: 1.6;
}

/* ---- Bank ---- */
.bank-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.bank-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 220px auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  color: var(--muted);
  font-size: 13px;
}

.search-field input {
  width: 100%;
}

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
}

.tag-chip:hover,
.tag-chip.active {
  border-color: var(--primary);
  color: var(--primary);
}

/* ---- Exam Grid ---- */
.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.exam-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 238px;
  padding: 18px;
}

.exam-card h2 {
  margin-bottom: 6px;
  font-size: 20px;
}

.exam-card p {
  color: var(--muted);
  line-height: 1.65;
}

.card-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.exam-icon {
  display: grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 8px;
  background: var(--surface-muted);
  font-size: 22px;
}

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

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}

.exam-card .actions {
  margin-top: auto;
}

/* ---- Exam View ---- */
.exam-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 18px;
  align-items: start;
}

.exam-header-panel {
  padding: 20px;
  margin-bottom: 18px;
}

.panel {
  padding: 20px;
}

.exam-titlebar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.progress-text {
  color: var(--muted);
  white-space: nowrap;
}

.question-title {
  margin-bottom: 16px;
  font-size: 23px;
  line-height: 1.45;
}

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

.option {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
}

.option input {
  margin-top: 3px;
}

.option.correct {
  border-color: var(--success);
  background: color-mix(in srgb, var(--success) 12%, var(--surface));
}

.option.wrong {
  border-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 12%, var(--surface));
}

.analysis {
  margin-top: 16px;
  padding: 14px;
  border-left: 4px solid var(--primary);
  background: var(--surface-muted);
  color: var(--muted);
  line-height: 1.7;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.answer-sheet {
  position: sticky;
  top: 70px;
}

.exam-bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--line);
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.06);
  padding: 10px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  z-index: 90;
}

.exam-bottom-bar .sheet-grid {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.exam-bottom-bar button[data-submit] {
  min-width: 80px;
  align-self: center;
}

.sheet-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.exam-bottom-bar .sheet-grid {
  grid-template-columns: repeat(auto-fill, minmax(32px, 1fr));
  gap: 6px;
}

.sheet-button {
  width: 40px;
  min-height: 38px;
  padding: 0;
}

.sheet-button.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
}

.sheet-button.answered:not(.active) {
  border-color: var(--success);
  color: var(--success);
}

/* ---- Questions List (All questions view) ---- */
.questions-list {
  display: grid;
  gap: 16px;
  margin-top: 18px;
  padding-bottom: 80px;
}

.question-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 18px;
  transition: border-color 0.2s;
}

.question-card.active-question {
  border-color: var(--primary);
}

.question-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.question-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
}

.question-type {
  padding: 0 8px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  border-radius: 4px;
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 12px;
}

.question-card-text {
  margin: 0 0 14px;
  font-size: 18px;
  line-height: 1.5;
}

/* ---- Result ---- */
.result-panel {
  padding: 22px;
}

.score {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
}

.score strong {
  font-size: 44px;
  line-height: 1;
}

.review-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.review-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface);
}

.review-item h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

/* ---- News ---- */
.news-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 220px auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}
.news-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.news-grid {
  display: grid;
  gap: 10px;
}

.news-card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 10px 14px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
  align-items: center;
}

.news-card:hover {
  border-color: var(--primary);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  transform: translateY(-1px);
}

.news-card-main {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-width: 0;
}

.news-card-info {
  min-width: 0;
  flex: 1;
}

.news-rank {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.news-rank.hot {
  background: var(--danger);
  color: #ffffff;
}

.news-card-title {
  margin: 0 0 6px;
  font-size: 15px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card-badges {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.news-logo {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  object-fit: contain;
}

.news-site {
  color: var(--muted);
  font-size: 12px;
}

.news-extra {
  padding: 0 6px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  border-radius: 3px;
  background: color-mix(in srgb, var(--primary) 10%, var(--surface-muted));
  color: var(--primary);
  font-size: 11px;
  font-weight: 500;
}

.news-time {
  color: var(--muted);
  font-size: 12px;
}

.news-card-thumb {
  grid-column: 2;
  grid-row: 1 / span 2;
  width: 96px;
  height: 96px;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--surface-muted);
  position: relative;
}

.news-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.news-card-actions {
  grid-column: 1 / -1;
  grid-row: 2;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-height: 24px;
}

.news-direct-link {
  font-size: 13px;
  text-decoration: none;
  color: var(--primary);
  transition: color 0.15s;
}

.news-direct-link:hover {
  color: var(--primary-strong);
}

.news-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px 0;
  color: var(--muted);
}

.loading-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--line);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---- Lightbox ---- */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
}

.lightbox-close {
  position: fixed;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 201;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* ---- Redirect ---- */
.redirect-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.redirect-card {
  max-width: 520px;
  width: 100%;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-align: center;
}

.redirect-image {
  width: 100%;
  max-height: 240px;
  overflow: hidden;
  border-radius: 8px;
  margin-bottom: 16px;
  background: var(--surface-muted);
  position: relative;
}

.redirect-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.redirect-info {
  margin-bottom: 18px;
}

.redirect-source {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.redirect-info h2 {
  margin-bottom: 6px;
  font-size: 20px;
  line-height: 1.5;
}

.redirect-target-url {
  margin-bottom: 14px;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--surface-muted);
  word-break: break-all;
}

.redirect-target-url a {
  font-size: 13px;
  color: var(--primary);
}

.redirect-actions {
  margin-bottom: 16px;
}

.redirect-actions .button-link {
  display: inline-flex;
}

.redirect-countdown {
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.redirect-countdown span {
  color: var(--muted);
  font-size: 14px;
}

.redirect-countdown strong {
  color: var(--primary);
}

.redirect-countdown-actions {
  display: flex;
  gap: 8px;
}

/* ---- Old News (keep for compat) ---- */
.news-list {
  display: grid;
  gap: 16px;
}

.news-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface);
}

.news-date {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 6px;
}

.news-item h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.news-item p {
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

/* ---- About ---- */
.about-content {
  max-width: 720px;
}

.about-content h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.about-content p {
  color: var(--muted);
  line-height: 1.7;
}

.about-content ul {
  color: var(--text);
  line-height: 1.8;
  padding-left: 24px;
}

.about-content li {
  margin-bottom: 4px;
}

/* ---- Misc ---- */
.muted {
  color: var(--muted);
}

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

.success {
  color: var(--success);
}

.img-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--surface-muted) 0%, color-mix(in srgb, var(--primary) 5%, var(--surface-muted)) 100%);
}

.img-fallback::before {
  content: '';
  display: block;
  width: 28px;
  height: 28px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='18' rx='2' ry='2'/%3E%3Ccircle cx='8.5' cy='8.5' r='1.5'/%3E%3Cpolyline points='21 15 16 10 5 21'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.5;
}

@media (max-width: 780px) {
  .app-shell {
    padding-left: 16px;
    padding-right: 16px;
  }

  .home-hero,
  .bank-toolbar,
  .news-toolbar {
    grid-template-columns: 1fr;
  }

  .home-hero h1 {
    font-size: 28px;
  }

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

  .section-head,
  .bank-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .exam-layout {
    grid-template-columns: 1fr;
  }

  .exam-bottom-bar {
    padding: 10px 16px;
  }

  .questions-list {
    margin-top: 14px;
  }

  .question-card {
    padding: 14px;
  }

  .question-card-text {
    font-size: 16px;
  }

  .news-card {
    grid-template-columns: 1fr;
  }

  .news-card-thumb {
    width: 100%;
    height: 160px;
    order: -1;
  }

  .news-card-actions {
    order: 1;
  }

  .redirect-page {
    min-height: auto;
    padding: 16px 0;
  }

  .redirect-card {
    padding: 18px;
  }

  .redirect-image {
    max-height: 180px;
  }

  .redirect-countdown {
    flex-direction: column;
    align-items: center;
  }
}