/* === Reset & Base === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 莫兰迪配色 palette */
  --morandi-green: #8a9b8e;
  --morandi-blue: #8a9bb5;
  --morandi-rose: #b58a8a;
  --morandi-beige: #c4b8a6;
  --morandi-sage: #9eafa9;
  --morandi-lavender: #9b95b5;
  --morandi-warm: #c4a98e;
  --morandi-sand: #d4c8b8;
  --morandi-stone: #b8ada0;
  --morandi-gray: #a09890;
  --morandi-fog: #e0d9d0;
  --morandi-mist: #d5d0c8;
  --morandi-pale: #e8e4dc;

  /* 系统色 */
  --color-bg: #ecddd0;
  --color-surface: rgba(255, 252, 248, 0.70);
  --color-surface-solid: #fffcf8;
  --color-border: rgba(180, 170, 160, 0.28);
  --color-border-light: rgba(180, 170, 160, 0.14);
  --color-text: #4a4038;
  --color-text-secondary: #7a7268;
  --color-text-muted: #a09890;
  --color-accent: #7a8b7e;
  --color-accent-light: rgba(138, 155, 142, 0.10);
  --color-accent-hover: #6a7b6e;
  --color-accent-subtle: rgba(138, 155, 142, 0.06);
  --color-danger: #b58a8a;
  --color-danger-light: rgba(181, 138, 138, 0.10);
  --color-success: #8a9b8e;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(100, 90, 80, 0.06);
  --shadow: 0 2px 8px rgba(100, 90, 80, 0.08);
  --shadow-md: 0 4px 16px rgba(100, 90, 80, 0.10);
  --shadow-lg: 0 8px 32px rgba(100, 90, 80, 0.12);
  --sidebar-width: 260px;
  --header-height: 60px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.page { display: none; }
.page.active { display: block; }

/* ═══ Login ═══ */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: linear-gradient(160deg, #d9cec0 0%, #e8ddd0 40%, #ddd0c0 100%);
}

.login-card {
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.login-brand {
  text-align: center;
  margin-bottom: 36px;
}

.brand-mark {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--morandi-green), var(--morandi-sage));
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
  box-shadow: 0 4px 12px rgba(138, 155, 142, 0.25);
}

.login-brand h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.login-brand p {
  color: var(--color-text-secondary);
  font-size: 14px;
}

/* ═══ Forms ═══ */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-sans);
  background: var(--color-surface-solid);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-group input::placeholder {
  color: var(--color-text-muted);
}

.form-group input:focus {
  border-color: var(--morandi-green);
  box-shadow: 0 0 0 3px rgba(138, 155, 142, 0.12);
}

.error-message {
  background: var(--color-danger-light);
  color: var(--color-danger);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 16px;
  border: 1px solid rgba(181, 138, 138, 0.15);
}

/* ═══ Buttons ═══ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.18s;
  outline: none;
  line-height: 1.4;
}

.btn-primary {
  background: var(--morandi-green);
  color: #ffffff;
}
.btn-primary:hover { background: var(--color-accent-hover); }
.btn-primary:active { transform: scale(0.97); }
.btn-full { width: 100%; padding: 13px; font-size: 15px; }

.btn-logout {
  background: var(--color-surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}

.btn-logout:hover {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border-color: rgba(181, 138, 138, 0.25);
}

/* ═══ Header ═══ */
.dashboard-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.header-left { display: flex; align-items: center; gap: 12px; }
.header-logo { display: flex; align-items: center; gap: 10px; }

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--morandi-green), var(--morandi-sage));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: 700;
}

.header-logo h1 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.2px;
}

.header-badge {
  background: var(--color-accent-light);
  color: var(--morandi-green);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid rgba(138, 155, 142, 0.10);
}

.header-right { display: flex; align-items: center; gap: 14px; }
.header-user { font-size: 13px; color: var(--color-text-secondary); font-weight: 500; }

/* ═══ Main Layout ═══ */
.dashboard-body {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* ═══ Sidebar (毛玻璃) ═══ */
.sidebar {
  width: var(--sidebar-width);
  overflow-y: auto;
  position: fixed;
  top: var(--header-height);
  bottom: 0;
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--color-border);
}

.sidebar-header {
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--color-border-light);
}

.section-label {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--color-text-muted);
  margin-top: 14px;
  margin-bottom: 8px;
}

/* 搜索区域（增大） */
.search-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-wrapper:focus-within {
  border-color: var(--morandi-green);
  box-shadow: 0 0 0 3px rgba(138, 155, 142, 0.10);
}

.search-icon {
  font-size: 16px;
  color: var(--color-text-muted);
  flex-shrink: 0;
  line-height: 1;
}

.search-wrapper input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--color-text);
  outline: none;
  padding: 8px 0;
  min-width: 0;
}

.search-wrapper input::placeholder { color: var(--color-text-muted); }

/* 搜索模式切换 */
.search-mode-toggle {
  display: flex;
  gap: 2px;
  margin-top: 10px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
  border: 1px solid var(--color-border-light);
}

.search-mode-btn {
  flex: 1;
  padding: 6px 8px;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  font-family: var(--font-sans);
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-muted);
  background: transparent;
  transition: all 0.15s;
}

.search-mode-btn:hover { color: var(--color-text-secondary); }

.search-mode-btn.active {
  background: var(--color-surface-solid);
  color: var(--morandi-green);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

.topic-scroll { padding: 8px; }

/* 毛玻璃专题卡片 */
.topic-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.18s;
  margin-bottom: 2px;
  background: transparent;
  border: 1px solid transparent;
}

.topic-item:hover {
  background: var(--color-accent-subtle);
  border-color: var(--color-border-light);
}

.topic-item.active {
  background: var(--color-surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.topic-item.active .topic-name-text {
  color: var(--morandi-green);
  font-weight: 700;
}

.topic-name {
  font-size: 13px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.4;
  min-width: 0;
}

.topic-name-text {
  color: var(--color-text);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-name-sub {
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-item.active .topic-name-sub { color: var(--color-text-secondary); }

.topic-meta {
  text-align: right;
  font-size: 11px;
  color: var(--color-text-muted);
  line-height: 1.5;
  flex-shrink: 0;
  margin-left: 8px;
}

.topic-count { display: block; }

.topic-citations {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.topic-item.active .topic-meta {
  color: var(--morandi-green);
  opacity: 0.8;
}

/* ═══ Main Content ═══ */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 28px 32px;
  max-width: 1000px;
}

.content-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.content-title-area { display: flex; align-items: center; gap: 12px; }

#current-topic-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.count-badge {
  background: var(--color-accent-light);
  color: var(--morandi-green);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid rgba(138, 155, 142, 0.10);
}

.content-controls { display: flex; align-items: center; gap: 8px; }

.sort-select {
  padding: 7px 32px 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-sans);
  background: var(--color-surface-solid);
  color: var(--color-text);
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' viewBox='0 0 12 12'%3E%3Cpath stroke='%237a7268' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M3 4.5l3 3 3-3'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.sort-select:focus {
  border-color: var(--morandi-green);
  box-shadow: 0 0 0 3px rgba(138, 155, 142, 0.10);
}

/* ═══ Papers List ═══ */
.papers-list { display: flex; flex-direction: column; gap: 12px; }

/* 毛玻璃论文卡片 */
.paper-card {
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}

/* 顶面高光线 */
.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
}

.paper-card:hover {
  border-color: rgba(180, 170, 160, 0.45);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.paper-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 10px;
}

.paper-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
  flex: 1;
}

.paper-citations-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  min-width: 60px;
  flex-shrink: 0;
}

.paper-citations-total {
  font-size: 22px;
  font-weight: 700;
  color: var(--morandi-green);
  line-height: 1;
}

.paper-citations-label {
  font-size: 11px;
  color: var(--color-text-muted);
}

.paper-citations-2026 {
  font-size: 11px;
  color: var(--color-success);
  margin-top: 2px;
  font-weight: 500;
}

.paper-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.paper-type {
  display: inline-block;
  padding: 2px 8px;
  background: var(--color-accent-light);
  border-radius: 4px;
  font-size: 11px;
  color: var(--morandi-green);
  font-weight: 500;
}

.paper-year {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.paper-authors {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  line-height: 1.5;
}

.paper-actions { display: flex; gap: 8px; }
.paper-actions .btn { padding: 5px 12px; font-size: 12px; }

.btn-bibtex {
  background: var(--color-surface);
  backdrop-filter: blur(8px);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-bibtex:hover {
  background: var(--color-accent-light);
  color: var(--morandi-green);
  border-color: var(--morandi-green);
}

/* ═══ Modal (毛玻璃) ═══ */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(100, 90, 80, 0.28);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-lg);
  padding: 0;
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--color-border-light);
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  transition: color 0.15s;
}

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

.modal-body {
  padding: 22px;
  overflow-y: auto;
  flex: 1;
}

.bibtex-pre {
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 16px;
  max-height: 340px;
  overflow-y: auto;
  color: var(--color-text);
}

.copy-success {
  color: var(--morandi-green);
  font-size: 13px;
  font-weight: 600;
  margin-left: 10px;
}

/* ═══ Empty State ═══ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}

.empty-state .empty-icon { font-size: 36px; margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 14px; }

.loading { text-align: center; padding: 40px; color: var(--color-text-muted); font-size: 13px; }

/* ═══ Scrollbar ═══ */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(100, 90, 80, 0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(100, 90, 80, 0.20); }

/* ═══ Responsive ═══ */

/* ═══ Statistics Section ═══ */
.stats-section {
  margin-bottom: 20px;
}

.stats-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  letter-spacing: -0.2px;
}

.stats-charts {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.stats-chart {
  flex: 1;
  min-width: 200px;
}

.stats-chart-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.bar-chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 80px;
  padding: 4px 0;
  border-bottom: 1px solid var(--color-border);
}

.bar-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
  min-width: 28px;
}

.bar-fill {
  width: 100%;
  max-width: 36px;
  background: linear-gradient(to top, var(--morandi-green), var(--morandi-sage));
  border-radius: 4px 4px 0 0;
  min-height: 4px;
  position: relative;
  transition: height 0.3s ease;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.bar-fill-cit {
  background: linear-gradient(to top, var(--morandi-blue), #a8b8d0);
}

.bar-val {
  position: absolute;
  top: -18px;
  font-size: 10px;
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
}

.bar-year {
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ═══ Year Filter ═══ */
.year-filter-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  padding: 10px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.year-filter-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-right: 4px;
}

.year-btn {
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  background: var(--color-accent-subtle);
  color: var(--color-text-secondary);
  transition: all 0.15s;
}

.year-btn:hover {
  background: var(--color-accent-light);
  color: var(--morandi-green);
  border-color: var(--morandi-green);
}

.year-btn.active {
  background: var(--morandi-green);
  color: #fff;
  border-color: var(--morandi-green);
}

/* ═══ Papers Table ═══ */
.papers-table-wrapper {
  margin-bottom: 28px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.papers-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.papers-table thead {
  background: var(--color-accent-subtle);
  border-bottom: 1px solid var(--color-border);
}

.papers-table th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 700;
  color: var(--color-text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.papers-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: middle;
}

.papers-table tbody tr:hover {
  background: var(--color-accent-subtle);
}

.papers-table tbody tr:last-child td {
  border-bottom: none;
}

.col-num {
  width: 40px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 12px;
}

.col-year {
  width: 60px;
  text-align: center;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.col-cit {
  width: 60px;
  text-align: center;
}

.cit-num {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--morandi-green);
  min-width: 28px;
}

.paper-title-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s;
}

.paper-title-link:hover {
  color: var(--morandi-green);
  text-decoration: underline;
}

.paper-authors-sm {
  font-size: 11px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ═══ Paper Details Section ═══ */
.paper-details-section {
  margin-top: 8px;
}

.year-group {
  margin-bottom: 20px;
}

.year-group-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border-light);
}

/* ═══ Mobile responsiveness for stats/table ═══ */
@media (max-width: 768px) {
  .stats-charts {
    flex-direction: column;
    gap: 16px;
  }

  .bar-chart {
    height: 60px;
  }

  .bar-item {
    min-width: 20px;
  }

  .bar-fill {
    max-width: 28px;
  }

  .bar-val {
    font-size: 9px;
    top: -16px;
  }

  .papers-table {
    font-size: 12px;
  }

  .papers-table th,
  .papers-table td {
    padding: 8px 10px;
  }

  .col-num {
    width: 28px;
  }

  .year-filter-bar {
    padding: 8px 10px;
  }

  .year-btn {
    padding: 3px 10px;
    font-size: 11px;
  }
}

@media (max-width: 480px) {
  .papers-table .col-year {
    display: none;
  }

  .paper-authors-sm {
    display: none;
  }
}

/* ═══ Tablet / Mobile ═══ */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 100%;
    --header-height: 52px;
  }

  .dashboard-body {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    position: relative;
    top: 0;
    max-height: 45vh;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    overflow-y: auto;
    z-index: 50;
  }

  .sidebar-header {
    padding: 12px 14px 10px;
  }

  .sidebar-header .section-label {
    margin-bottom: 8px;
    font-size: 10px;
  }

  .topic-scroll {
    padding: 4px 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .topic-item {
    flex: 0 0 auto;
    flex-direction: column;
    align-items: flex-start;
    padding: 6px 10px;
    margin-bottom: 0;
    min-width: 0;
    width: auto;
  }

  .topic-meta {
    text-align: left;
    margin-left: 0;
    display: flex;
    gap: 6px;
    font-size: 10px;
  }

  .topic-count, .topic-citations {
    display: inline;
  }

  .main-content {
    margin-left: 0;
    padding: 16px;
  }

  .content-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 16px;
  }

  #current-topic-title {
    font-size: 18px;
  }

  .paper-card {
    padding: 14px 16px;
  }

  .paper-header {
    flex-direction: column;
  }

  .paper-citations-group {
    flex-direction: row;
    gap: 6px;
  }

  .paper-title {
    font-size: 14px;
  }

  .header-logo h1 {
    font-size: 14px;
  }

  .dashboard-header {
    padding: 0 14px;
  }

  .header-badge {
    display: none;
  }

  .login-card {
    padding: 32px 24px;
  }

  .login-brand h1 {
    font-size: 18px;
  }
}

/* ═══ Small phones ═══ */
@media (max-width: 480px) {
  .sidebar {
    max-height: 40vh;
  }

  .topic-item {
    flex: 0 0 auto;
    padding: 5px 8px;
  }

  .topic-name {
    font-size: 12px;
  }

  .topic-name-sub {
    display: none;
  }

  .topic-meta {
    font-size: 10px;
  }

  .main-content {
    padding: 12px;
  }

  .paper-card {
    padding: 12px 14px;
  }

  .paper-title {
    font-size: 13px;
  }

  .paper-citations-total {
    font-size: 18px;
  }

  .modal-content {
    width: 95%;
    max-height: 90vh;
  }

  .bibtex-pre {
    font-size: 11px;
    padding: 10px 12px;
  }

  .header-user {
    display: none;
  }
}