/* ============================================================
   CFAnalysis — Early-2010s Web Dashboard Theme
   ============================================================ */

/* --- CSS Variables & Design Tokens --- */
:root {
  --bg-body: #d6dde3;
  --bg-card: #ffffff;
  --bg-header: linear-gradient(to bottom, #4a7ab5, #2c5a8c);
  --bg-inset: #eef1f5;
  --border-card: #b0bec5;
  --border-light: #cfd8dc;
  --text-dark: #263238;
  --text-muted: #607d8b;
  --text-white: #ffffff;
  --primary-color: #2980b9;
  --primary-hover: #2471a3;
  --primary-gradient: linear-gradient(to bottom, #3498db, #2980b9);
  --accent-color: #e67e22;
  --success-color: #27ae60;
  --danger-color: #c0392b;
  --warning-color: #f39c12;
  --font-family: 'Open Sans', 'Segoe UI', Tahoma, sans-serif;
  --transition: all 0.2s ease;
  --radius: 6px;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  --shadow-raised: 0 2px 6px rgba(0,0,0,0.15), 0 1px 3px rgba(0,0,0,0.1);
  --shadow-inset: inset 0 1px 3px rgba(0,0,0,0.08);

  /* Codeforces Rank Colors */
  --rank-newbie: #808080;
  --rank-pupil: #008000;
  --rank-specialist: #03a89e;
  --rank-expert: #0000ff;
  --rank-candidate-master: #aa00aa;
  --rank-master: #ff8c00;
  --rank-grandmaster: #ff0000;
}

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

body {
  background: var(--bg-body);
  color: var(--text-dark);
  font-family: var(--font-family);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 14px;
  line-height: 1.5;
}

/* --- Background Glow Elements (disabled for light theme) --- */
.bg-glow,
.bg-glow-1,
.bg-glow-2 {
  display: none;
}

/* --- Main Layout Container --- */
.app-container {
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px 40px 24px;
  flex-grow: 1;
}

/* --- Typography & Header --- */
.app-header {
  background: var(--bg-header);
  text-align: center;
  padding: 28px 24px 24px 24px;
  margin-bottom: 30px;
  border-bottom: 3px solid #1a4a73;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.logo-icon {
  font-size: 2rem;
  color: var(--text-white);
}

.logo h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-white);
}

.logo h1 span {
  color: #bdd8ee;
}

.subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.5px;
}

/* --- Search Section --- */
.search-section {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.search-form {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 680px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  padding: 8px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-raised);
}

.input-wrapper {
  display: flex;
  align-items: center;
  flex-grow: 1;
  padding-left: 12px;
  background: var(--bg-inset);
  border-radius: 4px;
  box-shadow: var(--shadow-inset);
}

.input-icon {
  color: var(--text-muted);
  font-size: 1rem;
  margin-right: 10px;
}

.search-form input {
  background: transparent;
  border: none;
  color: var(--text-dark);
  font-size: 0.95rem;
  font-family: var(--font-family);
  width: 100%;
  outline: none;
  padding: 8px 4px;
}

.search-form input::placeholder {
  color: #90a4ae;
}

/* --- Buttons --- */
.btn-group {
  display: flex;
  gap: 8px;
}

.btn {
  border: none;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  padding: 10px 24px;
  border-radius: var(--radius);
  border: 1px solid #1e6fa0;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.2), 0 1px 3px rgba(0,0,0,0.15);
  text-shadow: 0 -1px 0 rgba(0,0,0,0.2);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(to bottom, #2980b9, #2471a3);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.15), 0 2px 4px rgba(0,0,0,0.2);
}

.btn-primary:active:not(:disabled) {
  background: linear-gradient(to bottom, #2471a3, #1a5276);
  box-shadow: inset 0 2px 3px rgba(0,0,0,0.2);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-text {
  transition: var(--transition);
}

.btn-loader {
  display: none;
  position: absolute;
}

.btn-primary.loading .btn-text {
  opacity: 0;
}

.btn-primary.loading .btn-loader {
  display: block;
}

.btn-secondary {
  background: var(--bg-inset);
  color: var(--text-muted);
  border: 1px solid var(--border-card);
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
}

.btn-secondary:hover:not(:disabled) {
  background: #dce3e9;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* --- Banners --- */
.banner {
  max-width: 680px;
  margin: 0 auto 20px auto;
  padding: 12px 18px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-card);
  animation: slide-down 0.3s ease-out;
}

.banner-close {
  background: transparent;
  border: none;
  color: inherit;
  font-size: 1.1rem;
  cursor: pointer;
  margin-left: auto;
  opacity: 0.6;
  transition: var(--transition);
}

.banner-close:hover {
  opacity: 1;
}

.banner-error {
  background: rgba(192,57,43,0.08);
  border: 1px solid rgba(192,57,43,0.25);
  color: #922b21;
}

.banner-error .banner-icon {
  color: var(--danger-color);
}

.banner-info {
  background: rgba(41,128,185,0.08);
  border: 1px solid rgba(41,128,185,0.25);
  color: #1a5276;
}

.banner-info .banner-icon {
  color: var(--primary-color);
}

@keyframes slide-down {
  0% {
    transform: translateY(-10px);
    opacity: 0;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

/* --- Utility --- */
.hidden {
  display: none !important;
}

/* --- Card & Panel Styles --- */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-raised);
}

.glass-panel {
  background: var(--bg-card);
}

/* --- Dashboard Grid System --- */
.dashboard-grid {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 24px;
  max-width: 1600px;
}

.sidebar-column {
  height: fit-content;
  position: sticky;
  top: 24px;
}

.charts-column {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.charts-column .full-row {
  grid-column: 1 / -1;
}

@media (max-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .sidebar-column {
    position: static;
  }
}

@media (max-width: 768px) {
  .charts-column {
    grid-template-columns: 1fr;
  }
}

/* --- Profile Card Styles --- */
.profile-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: fit-content;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 2px solid var(--border-card);
  background-color: var(--bg-card);
  object-fit: cover;
}

.profile-title h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 4px;
  word-break: break-all;
  color: var(--text-dark);
}

.rank-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: capitalize;
  letter-spacing: 0.5px;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--bg-inset);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
}

#user-rank, #user-max-rank {
  text-transform: capitalize;
}

.profile-details {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 10px;
}

.metric-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dark);
}

/* --- Codeforces Rank Styling Classes --- */
.cf-rank-newbie {
  color: #808080 !important;
  border-color: rgba(128,128,128,0.25);
  background: rgba(128,128,128,0.08);
}

.cf-rank-pupil {
  color: #008000 !important;
  border-color: rgba(0,128,0,0.25);
  background: rgba(0,128,0,0.08);
}

.cf-rank-specialist {
  color: #03a89e !important;
  border-color: rgba(3,168,158,0.25);
  background: rgba(3,168,158,0.08);
}

.cf-rank-expert {
  color: #0000ff !important;
  border-color: rgba(0,0,255,0.25);
  background: rgba(0,0,255,0.08);
}

.cf-rank-candidate-master {
  color: #aa00aa !important;
  border-color: rgba(170,0,170,0.25);
  background: rgba(170,0,170,0.08);
}

.cf-rank-master {
  color: #ff8c00 !important;
  border-color: rgba(255,140,0,0.25);
  background: rgba(255,140,0,0.08);
}

.cf-rank-grandmaster {
  color: #ff0000 !important;
  border-color: rgba(255,0,0,0.25);
  background: rgba(255,0,0,0.08);
  font-weight: 800;
}

/* --- Tab Navigation --- */
.charts-nav {
  display: flex;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-card);
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(41,128,185,0.3) #eef1f5;
}

.charts-nav::-webkit-scrollbar {
  height: 6px;
}

.charts-nav::-webkit-scrollbar-track {
  background: #eef1f5;
  border-radius: 10px;
}

.charts-nav::-webkit-scrollbar-thumb {
  background: rgba(41,128,185,0.3);
  border-radius: 10px;
}

.charts-nav::-webkit-scrollbar-thumb:hover {
  background: rgba(41,128,185,0.6);
}

.tab-group {
  display: flex;
  flex-direction: column;
}

.tab-group-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 4px;
  padding-left: 4px;
}

.tab-group-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.nav-tab {
  background: #eef1f5;
  border: 1px solid var(--border-light);
  border-radius: 4px 4px 0 0;
  color: var(--text-muted);
  font-family: var(--font-family);
  font-weight: 500;
  font-size: 0.82rem;
  padding: 8px 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: var(--transition);
}

.nav-tab:hover {
  background: #e0e5ea;
  color: var(--text-dark);
}

.nav-tab.active {
  background: #ffffff;
  border-bottom-color: #ffffff;
  color: var(--primary-color);
  font-weight: 700;
  box-shadow: 0 -2px 4px rgba(0,0,0,0.06);
}

.nav-tab i {
  font-size: 0.85rem;
}

/* --- Chart Card Styles --- */
.chart-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 500px;
}

.chart-card.full-row {
  min-height: 580px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
  margin-bottom: 12px;
}

.card-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dark);
}

.card-header h3 i {
  color: var(--primary-color);
}

.card-tooltip {
  font-size: 0.72rem;
  color: var(--text-muted);
  border: 1px solid var(--border-light);
  padding: 3px 8px;
  border-radius: 4px;
  cursor: help;
  background: var(--bg-inset);
}

/* Reset Zoom Button */
.reset-zoom-btn {
  display: none;
  font-family: var(--font-family);
  font-size: 0.75rem;
  padding: 4px 10px;
  background: #eef1f5;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-muted);
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.reset-zoom-btn:hover {
  background: #dce3e9;
  color: var(--text-dark);
}

.reset-zoom-btn.visible {
  display: inline-flex;
}

.chart-wrapper {
  position: relative;
  flex-grow: 1;
  width: 100%;
  height: 100%;
  min-height: 420px;
}

.chart-footer-note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 10px;
  margin-top: 8px;
  line-height: 1.4;
}

.chart-footer-note i {
  color: var(--primary-color);
  margin-top: 2px;
  font-size: 0.85rem;
}

/* --- Chart Placeholders --- */
.chart-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
  background: var(--bg-inset);
  border: 1px dashed var(--border-card);
  border-radius: var(--radius);
  color: var(--text-muted);
}

.placeholder-icon {
  font-size: 2.5rem;
  color: #b0bec5;
  margin-bottom: 12px;
}

.chart-placeholder p {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dark);
  max-width: 320px;
  margin-bottom: 6px;
}

.placeholder-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  opacity: 0.8;
}

/* --- Landing / Empty State Styles --- */
.landing-state {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 60px 0;
}

.landing-content {
  width: 100%;
  max-width: 600px;
  padding: 40px;
  text-align: center;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-card);
}

.landing-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 18px;
}

.landing-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.landing-content p {
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.features-list {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dark);
}

.feature-item i {
  color: var(--success-color);
}

/* --- Loading Skeleton Screen Styles --- */
.loading-skeleton {
  width: 100%;
}

.skeleton-grid {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 24px;
}

@media (max-width: 1024px) {
  .skeleton-grid {
    grid-template-columns: 1fr;
  }
}

.skeleton-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-card);
  padding: 24px;
  height: 380px;
  box-shadow: var(--shadow-card);
}

.skeleton-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: #e0e5ea;
}

.skeleton-title {
  width: 40%;
  height: 20px;
  border-radius: 4px;
  background: #e0e5ea;
  margin-bottom: 20px;
}

.skeleton-graph {
  width: 100%;
  height: calc(100% - 40px);
  border-radius: var(--radius);
  background: #eef1f5;
}

.skeleton-row {
  display: flex;
  gap: 20px;
  margin-bottom: 16px;
}

.skeleton-cell {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skeleton-line {
  height: 12px;
  border-radius: 4px;
  background: #e0e5ea;
}

/* Shimmer skeleton animation */
.shinny {
  position: relative;
  overflow: hidden;
}

.shinny::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  transform: translateX(-100%);
  background: linear-gradient(
    90deg,
    rgba(255,255,255,0) 0%,
    rgba(255,255,255,0.4) 20%,
    rgba(255,255,255,0.6) 60%,
    rgba(255,255,255,0) 100%
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

/* --- Incremental Calculation Card --- */
.calc-card {
  background: var(--bg-inset);
  border-radius: var(--radius);
  border: 1px solid var(--border-card);
  padding: 18px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-card);
}

.calc-card-header h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dark);
}

.calc-card-header h4 i {
  color: var(--accent-color);
}

.calc-card-header p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 14px;
}

.progress-container-wrapper {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background: #d6dde3;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--shadow-inset);
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-gradient);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.3);
  transition: width 0.4s ease;
  width: 0%;
}

.progress-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.82rem;
  border-radius: var(--radius);
}

/* --- Heatmap Styles --- */
.heatmap-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  padding: 10px 0;
  width: 100%;
}

.heatmap-scroll-container {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 10px;
  display: flex;
  justify-content: flex-start;
  scrollbar-width: thin;
  scrollbar-color: rgba(41,128,185,0.3) #eef1f5;
}

.heatmap-scroll-container::-webkit-scrollbar {
  height: 6px;
}

.heatmap-scroll-container::-webkit-scrollbar-track {
  background: #eef1f5;
  border-radius: 10px;
}

.heatmap-scroll-container::-webkit-scrollbar-thumb {
  background: rgba(41,128,185,0.3);
  border-radius: 10px;
}

.heatmap-scroll-container::-webkit-scrollbar-thumb:hover {
  background: rgba(41,128,185,0.6);
}

.heatmap-grid {
  display: grid;
  grid-template-rows: repeat(7, 14px);
  grid-auto-flow: column;
  grid-auto-columns: 14px;
  gap: 3px;
  padding: 10px;
}

.heatmap-cell {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  background-color: #e0e5ea;
  transition: transform 0.15s ease;
  cursor: pointer;
  position: relative;
}

.heatmap-cell:hover {
  transform: scale(1.3);
  z-index: 10;
  box-shadow: 0 0 6px rgba(0,0,0,0.25);
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.legend-box {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: inline-block;
}

/* --- Upsolve Tracker Rework Styles --- */
.upsolve-stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
  margin: 15px 0 20px 0;
  padding: 0 5px;
}

.upsolve-stat-card {
  background: linear-gradient(to bottom, #ffffff 0%, #f9fbfd 100%);
  border: 1px solid var(--border-card);
  border-radius: 6px;
  padding: 12px 15px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.upsolve-stat-card .stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 5px;
}

.upsolve-stat-card .stat-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-dark);
}

.upsolve-stat-card.stat-unsolved .stat-value {
  color: #d32f2f;
}

.upsolve-stat-card.stat-solved .stat-value {
  color: #2e7d32;
}

.upsolve-stat-card.stat-rate .stat-value {
  color: #1976d2;
}

.upsolve-checklist-container {
  border-top: 1px solid #cfd8dc;
  margin-top: 15px;
  padding-top: 15px;
}

.upsolve-checklist-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding: 0 5px;
}

.upsolve-checklist-header h4 {
  font-size: 0.95rem;
  color: var(--text-dark);
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.upsolve-filter-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.upsolve-filter-toggle input {
  cursor: pointer;
}

.upsolve-table-wrapper {
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid #b0bec5;
  border-radius: 4px;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}

.upsolve-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.upsolve-table th {
  background: linear-gradient(to bottom, #f5f7f8 0%, #e8ecef 100%);
  color: var(--text-dark);
  font-weight: 700;
  padding: 8px 12px;
  border-bottom: 1px solid #cfd8dc;
  position: sticky;
  top: 0;
  z-index: 2;
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

.upsolve-table td {
  padding: 10px 12px;
  border-bottom: 1px solid #e0e0e0;
  color: var(--text-dark);
}

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

.upsolve-table tbody tr:nth-child(even) {
  background-color: #fcfdfe;
}

.upsolve-table tbody tr:hover {
  background-color: #f1f5f8;
}

.upsolve-table .col-checkbox {
  width: 40px;
  text-align: center;
}

.upsolve-table .col-contest {
  width: 90px;
}

.upsolve-table .col-rating {
  width: 100px;
}

.upsolve-table .col-action {
  width: 80px;
  text-align: right;
}

.upsolve-status-checkbox {
  color: #90a4ae;
  font-size: 1.05rem;
}

.upsolve-status-checkbox.status-solved {
  color: #2e7d32;
}

.upsolve-status-checkbox.status-pending {
  color: #d32f2f;
}

.badge-rating {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 700;
  font-size: 0.75rem;
  color: #ffffff !important;
  text-shadow: 1px 1px 0px rgba(0,0,0,0.15);
}

.btn-upsolve-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: linear-gradient(to bottom, #ffffff 0%, #f0f4f8 100%);
  border: 1px solid #b0bec5;
  border-radius: 3px;
  color: #1976d2 !important;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  transition: all 0.15s ease;
}

.btn-upsolve-link:hover {
  background: linear-gradient(to bottom, #f0f4f8 0%, #e1e8f0 100%);
  border-color: #90a4ae;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.zoom-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  background-color: #f1f5f8;
  border: 1px solid #cfd8dc;
  border-radius: 3px;
  padding: 2px 6px;
  margin-right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  user-select: none;
  font-weight: 600;
  box-shadow: 0 1px 0px rgba(0,0,0,0.05);
}

/* --- Footer --- */
.app-footer {
  text-align: center;
  padding: 24px 24px;
  background: #ffffff;
  color: var(--text-muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border-card);
  margin-top: 40px;
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
  .app-header {
    padding: 20px 16px 18px 16px;
  }

  .logo h1 {
    font-size: 1.6rem;
  }

  .subtitle {
    font-size: 0.85rem;
  }

  .app-container {
    padding: 0 12px 24px 12px;
  }

  .search-form {
    flex-direction: column;
  }

  .charts-nav {
    flex-direction: column;
    gap: 12px;
  }

  .tab-group-tabs {
    flex-wrap: wrap;
  }

  .chart-card {
    min-height: 400px;
  }

  .chart-card.full-row {
    min-height: 450px;
  }

  .chart-wrapper {
    min-height: 320px;
  }

  .zoom-hint {
    display: none;
  }
}