/**
 * 华中师范大学文学考研真题研习系统 - 样式表
 * 文件路径: style.css
 * 配色：黛蓝 · 古铜金 · 米白（学术练习站视觉风格，非官方校色声明）
 */

/* ==========================================
 * 1. 变量与基础规范 (Design Tokens)
 * ========================================== */
:root {
  --ccnu-ink: #1f3a5f;
  --ccnu-ink-hover: #16293f;
  --ccnu-ink-dark: #101f31;
  --ccnu-ink-light: #eaf0f7;
  --ccnu-gold: #c9a96e;
  --ccnu-gold-dark: #a68545;
  --ccnu-gold-light: #fdfaf2;
  --bg-paper: #f4f1ea;
  --card-bg: #ffffff;
  --text-dark: #1c2330;
  --text-sub: #4a5568;
  --text-muted: #8a94a6;
  --border-color: #e2ddcf;
  --border-dark: #c9c2b2;
  --wrong: #c93b3b;
  --wrong-bg: #fdf0f0;
  --star: #d48806;
  --star-bg: #fffbe6;
  --ok: #278248;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(31, 58, 95, 0.12);
  --shadow-hover: 0 8px 24px rgba(31, 58, 95, 0.16);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Serif SC", "STSong",
    "Songti SC", "SimSun", "Microsoft YaHei", serif, sans-serif;
  background-color: var(--bg-paper);
  color: var(--text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ==========================================
 * 2. 顶部校训栏 (Top Motto Bar)
 * ========================================== */
.top-motto-bar {
  background: #191414;
  color: var(--ccnu-gold);
  border-bottom: 1px solid rgba(201, 169, 110, 0.2);
  padding: 6px 0;
  font-size: 12px;
}

.motto-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.motto-cn {
  font-weight: 700;
  letter-spacing: 2px;
}

.motto-en {
  font-family: "Georgia", serif;
  font-style: italic;
  color: #a89f91;
  font-size: 11px;
}

/* ==========================================
 * 3. 顶部导航栏 (Header)
 * ========================================== */
.header {
  background-color: #ffffff;
  border-bottom: 2px solid var(--ccnu-ink);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 70px;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.brand-emblem-img {
  width: 46px;
  height: 46px;
  object-fit: contain;
  border-radius: 50%;
  background: #ffffff;
  border: 1.5px solid var(--ccnu-gold);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-wordmark-img {
  height: 26px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  object-position: left center;
}


.brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-item a {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-dark);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-item a:hover {
  color: var(--ccnu-ink);
  background: var(--ccnu-ink-light);
}

.nav-item a.active {
  color: var(--ccnu-ink);
  font-weight: 700;
  background: var(--ccnu-ink-light);
}

/* AI 批改说明：维护期仅展示提示文本 */

/* ==========================================
 * 4. 首屏双栏区 (Hero)
 * ========================================== */
.banner {
  min-height: 340px;
  position: relative;
  background: linear-gradient(135deg, #33465f 0%, #22344d 55%, #152238 100%);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--ccnu-gold);
  overflow: hidden;
}

.banner-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at top right,
    rgba(201, 169, 110, 0.15),
    transparent 70%
  );
}

.banner-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
}

.banner-motto {
  font-size: 28px;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 3px;
  font-family: "STSong", "Songti SC", "SimSun", serif;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

.banner-motto-sub {
  margin-top: 4px;
  font-size: 15px;
  letter-spacing: 8px;
  text-indent: 2px;
  color: var(--ccnu-gold);
  font-weight: 700;
}

.banner-sub {
  font-size: 13.5px;
  color: #c9d4e3;
  margin-top: 8px;
  letter-spacing: 1px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--ccnu-gold);
  margin-bottom: 10px;
}

.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.hero-right {
  min-width: 0;
}

.hero-preview-card {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-md);
  color: var(--text-dark);
}

.hero-preview-head {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.hero-preview-foot {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

/* ==========================================
 * 5. 主体容器与通用面板 (Layout & Panels)
 * ========================================== */
#view-home {
  position: relative;
}

.home-watermark {
  position: absolute;
  right: 8px;
  bottom: 40px;
  width: 300px;
  height: auto;
  opacity: 0.09;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

#view-home .section-box,
#view-home .hero-stats,
#view-home .home-grid {
  position: relative;
  z-index: 1;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.home-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 18px;
  margin-bottom: 6px;
}

.home-grid .portals-grid {
  grid-template-columns: 1fr 1fr;
  margin-bottom: 0;
}

.recent-item {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 13px;
}

.recent-item:last-child {
  border-bottom: none;
}

.today-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  text-align: center;
}

.today-num {
  font-size: 26px;
  color: var(--ccnu-ink);
}

.today-label {
  font-size: 12px;
  color: var(--text-muted);
}

.site-footer {
  border-top: 2px solid var(--ccnu-ink);
  background: #ffffff;
  padding: 22px 0 28px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-motto {
  font-size: 14px;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.footer-disclaimer {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-sub);
}

/* ==========================================
 * 5. 主体容器与通用面板 (Layout & Panels)
 * ========================================== */
.main-container {
  max-width: 1200px;
  margin: 28px auto 60px;
  padding: 0 24px;
}

.view {
  display: none;
}

.view.active {
  display: block;
  animation: fadeIn 0.25s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.section-box {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ccnu-ink);
  margin-bottom: 18px;
}

.section-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--ccnu-ink);
  font-family: "Noto Serif SC", "Songti SC", serif;
}

.section-tip {
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================
 * 6. 首页看板组件 (Dashboard Components)
 * ========================================== */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.data-card {
  background-color: var(--ccnu-ink);
  color: #ffffff;
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(201, 169, 110, 0.3);
  transition: transform 0.2s ease;
}

.data-card:hover {
  transform: translateY(-3px);
}

.data-number {
  font-size: 34px;
  font-weight: 900;
  font-family: "Georgia", "STSong", serif;
  line-height: 1.1;
  color: #fffef8;
}

.data-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
  margin-top: 5px;
}

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

.portal-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.portal-card:hover {
  transform: translateY(-4px);
  border-color: var(--ccnu-ink);
  box-shadow: var(--shadow-hover);
}

.portal-icon {
  font-size: 26px;
  margin-bottom: 10px;
}

.portal-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 5px;
}

.portal-card:hover .portal-name {
  color: var(--ccnu-ink);
}

.portal-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.year-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 12px;
}

.year-btn {
  background: var(--bg-paper);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 6px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.year-btn:hover {
  border-color: var(--ccnu-ink);
  background: #f2f6fb;
  transform: translateY(-2px);
}

.year-btn.active {
  background: var(--ccnu-ink);
  color: #ffffff;
  border-color: var(--ccnu-ink);
}

.year-title {
  font-size: 16px;
  font-weight: 800;
}

.year-cnt {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.year-btn.active .year-cnt {
  color: #c9dcf2;
}

/* ==========================================
 * 7. 题目卡片与作答区 (Question Cards)
 * ========================================== */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.q-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.q-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 12px;
}

.badge {
  font-size: 12px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.badge-year {
  background: #ede8df;
  color: #4a453e;
}

.badge-subject {
  background: var(--ccnu-ink-light);
  color: var(--ccnu-ink);
  border: 1px solid #cfdcee;
}

.badge-code {
  background: #eef2f7;
  color: #1f426d;
}

.badge-type {
  background: #fdf5e6;
  color: #8c610b;
}

.badge-score {
  background: #edf7ed;
  color: #1e592f;
  margin-left: auto;
}

.badge-score-unknown {
  background: #f3f0ea;
  color: #7a7268;
}

.q-source-meta {
  margin: 8px 0 4px;
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

.ai-maintain-tip {
  color: var(--text-sub);
  margin: 0;
  line-height: 1.6;
}

.q-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.7;
  margin-bottom: 12px;
  color: var(--text-dark);
  font-family: "Noto Serif SC", "STSong", serif;
  white-space: pre-line;
}

.q-analysis {
  display: none;
  background: var(--bg-paper);
  border-left: 4px solid var(--ccnu-ink);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 16px;
  margin: 14px 0;
}

.q-analysis.show {
  display: block;
}

.q-analysis-label {
  font-size: 13px;
  font-weight: 800;
  color: var(--ccnu-ink);
  margin-bottom: 6px;
}

.q-analysis-body {
  font-size: 14px;
  line-height: 1.75;
  white-space: pre-line;
  color: #333333;
}

.q-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.tag {
  font-size: 11px;
  padding: 2px 8px;
  background: #f0eae1;
  color: var(--text-sub);
  border-radius: var(--radius-sm);
}

.q-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

/* 按钮规范 */
.btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--ccnu-ink);
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--ccnu-ink-hover);
}

.btn-ghost {
  background: var(--ccnu-ink-light);
  color: var(--ccnu-ink);
  border: 1px solid #cfdcee;
}

.btn-wrong {
  background: var(--wrong-bg);
  color: var(--wrong);
  border: 1px solid #f8cdcd;
}

.btn-wrong-active {
  background: var(--wrong);
  color: #ffffff;
}

.btn-fav {
  background: var(--star-bg);
  color: #9c6800;
  border: 1px solid #fae69e;
}

.btn-fav-active {
  background: var(--star);
  color: #ffffff;
}

/* 作答框与 AI 批改卡片 */
.ai-grade-container {
  margin-top: 16px;
  border-top: 1px dashed var(--border-color);
  padding-top: 14px;
}

.answer-label {
  font-size: 13px;
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
  color: var(--text-sub);
}

.card-answer-input {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
  background: #ffffff;
}

.card-answer-input:focus {
  border-color: var(--ccnu-ink);
  outline: none;
}

.ai-ctrl-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}

.muted-tip {
  font-size: 12px;
  color: var(--text-muted);
}

.ai-result-box {
  margin-top: 12px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--ccnu-ink);
  border-radius: var(--radius-sm);
  padding: 14px;
}


/* ==========================================
 * 8. 模考控制台与答题卡 (Exam Workspace)
 * ========================================== */
.paper-ctrl-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  background: #ffffff;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
}

.paper-selects {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.ctrl-label {
  font-size: 13.5px;
  font-weight: 700;
}

.paper-selects select {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  background: #ffffff;
}

.mode-btn-group {
  display: flex;
  gap: 6px;
}

.paper-nav-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin: 18px 0 24px;
}

.ac-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(38px, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.ac-cell {
  aspect-ratio: 1;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: #ffffff;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  transition: all 0.15s ease;
}

.ac-cell.cur {
  background: var(--ccnu-ink);
  color: #ffffff;
  border-color: var(--ccnu-ink);
}

.ac-cell.marked {
  border-color: var(--wrong);
  color: var(--wrong);
}

/* ==========================================
 * 9. 分类与检索组件 (Category & Search)
 * ========================================== */
.subj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.subj-card {
  padding: 14px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  transition: all 0.2s ease;
}

.subj-card:hover,
.subj-card.active {
  border-color: var(--ccnu-ink);
  background: var(--ccnu-ink-light);
}

.sc-name {
  font-size: 14.5px;
  font-weight: 700;
  display: block;
}

.sc-cnt {
  font-size: 11.5px;
  color: var(--ccnu-ink);
  margin-top: 2px;
  display: block;
}

.type-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.type-chip {
  padding: 6px 14px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.type-chip:hover {
  border-color: var(--ccnu-ink);
}

.type-chip.active {
  background: var(--ccnu-ink);
  color: #ffffff;
  border-color: var(--ccnu-ink);
}

.search-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.search-bar input {
  flex: 1;
  padding: 10px 14px;
  font-size: 14.5px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.search-bar input:focus {
  border-color: var(--ccnu-ink);
  outline: none;
}

.search-summary {
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================
 * 10. 表单与通用反馈 (Forms, Toast, Empty)
 * ========================================== */

.empty-box {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

#toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);
  background: #191414;
  color: #ffffff;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 999;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#toast.show {
  opacity: 1;
  bottom: 42px;
}

/* ==========================================
 * 11. 响应式布局 (Responsive Breakpoints)
 * ========================================== */
html,
body {
  max-width: 100%;
  overflow-x: clip;
}

img,
select,
input,
textarea {
  max-width: 100%;
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .home-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .home-grid .portals-grid {
    grid-template-columns: 1fr 1fr;
  }
  .year-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .home-watermark {
    width: 200px;
    opacity: 0.08;
  }
}

@media (max-width: 680px) {
  .top-motto-bar {
    font-size: 11px;
  }
  .motto-inner {
    padding: 0 12px;
    gap: 2px;
    justify-content: flex-start;
  }
  .motto-cn {
    font-size: 11px;
    letter-spacing: 0;
    line-height: 1.5;
    overflow-wrap: anywhere;
    word-break: break-all;
    white-space: normal;
  }
  .motto-en {
    display: none;
  }
  .header-inner {
    max-width: 100%;
    padding: 10px 12px;
    height: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .brand-logo {
    min-width: 0;
    max-width: 100%;
    gap: 8px;
  }
  .brand-emblem-img {
    width: 36px;
    height: 36px;
  }
  .brand-text {
    min-width: 0;
    max-width: 100%;
  }
  .brand-wordmark-img {
    height: 20px;
    max-width: 150px;
  }
  .brand-sub {
    font-size: 10px;
    letter-spacing: 0;
    white-space: normal;
    overflow-wrap: anywhere;
    word-break: break-all;
  }
  .header-inner nav {
    min-width: 0;
    max-width: 100%;
  }
  .nav-menu {
    max-width: 100%;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 2px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
  }
  .nav-item {
    flex: 0 0 auto;
  }
  .nav-item a {
    font-size: 13px;
    padding: 6px 8px;
    white-space: nowrap;
  }
  .banner {
    min-height: 0;
    padding: 28px 0;
  }
  .banner-content {
    padding: 0 12px;
    min-width: 0;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .banner-motto {
    font-size: 22px;
    letter-spacing: 1px;
    line-height: 1.4;
    overflow-wrap: anywhere;
  }
  .banner-motto-sub {
    letter-spacing: 4px;
    font-size: 13px;
  }
  .banner-sub {
    font-size: 12px;
    line-height: 1.7;
    overflow-wrap: anywhere;
    word-break: break-all;
    white-space: normal;
  }
  .hero-preview-card {
    padding: 14px;
  }
  .main-container {
    padding: 0 12px;
    min-width: 0;
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .home-grid {
    grid-template-columns: 1fr;
  }
  .home-grid .portals-grid {
    grid-template-columns: 1fr;
  }
  .year-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .home-watermark {
    display: none;
  }
  .paper-ctrl-bar {
    padding: 12px;
  }
  .paper-selects select {
    max-width: 100%;
  }
  .q-card {
    padding: 16px;
  }
  .search-bar {
    flex-direction: column;
  }
  .footer-inner {
    padding: 0 12px;
  }
}

/* ==========================================
 * 12. 微信联系弹窗 (Wechat Contact Modal)
 * ========================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 14, 10, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.25s ease,
    visibility 0.25s ease;
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  position: relative;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 32px 28px 24px;
  max-width: 340px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--ccnu-gold);
  transform: scale(0.9);
  transition: transform 0.25s ease;
}

.modal-overlay.show .modal-box {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 14px;
  border: none;
  background: transparent;
  font-size: 22px;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close:hover {
  color: var(--ccnu-ink);
}

.modal-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--ccnu-ink);
  margin-bottom: 16px;
  font-family: "Noto Serif SC", "Songti SC", serif;
}

.modal-qrcode {
  width: 220px;
  max-width: 100%;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  margin: 0 auto 14px;
  display: block;
}

.modal-tip {
  font-size: 12.5px;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 18px;
}

.modal-ok {
  width: 100%;
}

/* 表单输入与按钮组合（保留布局工具类） */
.input-with-btn {
  display: flex;
  gap: 8px;
}

.input-with-btn .form-input {
  flex: 1;
}