:root {
  --primary: #201d1d;
  --on-primary: #fdfcfc;
  --ink: #201d1d;
  --ink-deep: #0f0000;
  --charcoal: #302c2c;
  --body: #424245;
  --mute: #646262;
  --stone: #6e6e73;
  --ash: #9a9898;
  --canvas: #fdfcfc;
  --surface-soft: #f8f7f7;
  --surface-card: #f1eeee;
  --surface-dark: #201d1d;
  --surface-dark-elevated: #302c2c;
  --on-dark: #fdfcfc;
  --hairline: #e4e4e7;
  --hairline-strong: #d1d1d6;
  
  --font-mono: "Berkeley Mono", "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --spacing-xxs: 1px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-xxl: 32px;
  --spacing-section: 96px;
  
  --rounded-none: 0px;
  --rounded-sm: 4px;
  --rounded-full: 9999px;
}

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


.account-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background-color: var(--surface-soft);
  padding: var(--spacing-lg);
  border: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--rounded-sm);
  transition: all 0.2s ease;
}

.stat-card.clickable:hover {
  background-color: var(--hairline);
  border-color: var(--mute);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
}

.stat-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--mute);
  margin-top: var(--spacing-xs);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.history-item {
  padding: var(--spacing-md);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-sm);
  background-color: var(--canvas);
}

.action-box {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-sm);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s ease;
  background-color: var(--surface-soft);
  color: var(--body);
}

.action-box:hover {
  border-color: var(--mute);
}

.action-box input[type="checkbox"] {
  cursor: pointer;
}

[data-theme="dark"] {
  --primary: #fdfcfc;
  --on-primary: #201d1d;
  --ink: #fdfcfc;
  --ink-deep: #ffffff;
  --charcoal: #302c2c;
  --body: #d1d1d6;
  --mute: #9a9898;
  --stone: #8e8e93;
  --ash: #646262;
  --canvas: #121212;
  --surface-soft: #1e1e1e;
  --surface-dark: #2a2a2a;
  --surface-dark-elevated: #3a3a3a;
  --on-dark: #fdfcfc;
  --hairline: #302c2c;
  --hairline-strong: #424245;
}

body {
  font-family: var(--font-mono);
  background-color: var(--canvas);
  color: var(--body);
  font-size: 16px;
  line-height: 1.5;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--ink);
  text-decoration: underline;
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6, strong {
  color: var(--ink);
}

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

.display-xl {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.heading-md {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.body-md {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
}

.body-strong {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
}


.nav-container, .footer-container, #app {
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--spacing-xl);
}


.primary-nav {
  background-color: var(--canvas);
  color: var(--ink);
  font-weight: 500;
  height: 48px;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.wordmark a {
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}


button {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  line-height: 2;
  cursor: pointer;
  border: none;
  outline: none;
}

.button-primary {
  background-color: var(--ink);
  color: var(--canvas);
  border: none;
  padding: 8px 16px;
  border-radius: var(--rounded-sm);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14px;
}

.button-primary:hover {
  background-color: var(--ink-deep);
}

.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--surface-soft);
  color: var(--mute);
  border: 1px solid var(--hairline);
  padding: 6px 12px;
  border-radius: var(--rounded-md);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  height: 32px;
}

.search-trigger:hover {
  background-color: var(--canvas);
  border-color: var(--mute);
  color: var(--ink);
}

.filter-pill {
  background-color: var(--surface-soft);
  color: var(--mute);
  border: 1px solid var(--hairline);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-pill:hover {
  background-color: var(--hairline);
  color: var(--ink);
}

.filter-pill.active {
  background-color: var(--ink);
  color: var(--canvas);
  border-color: var(--ink);
}

.button-secondary {
  background-color: transparent;
  color: var(--ink);
  border-radius: 0;
  padding: 0;
  border: none;
  height: auto;
  line-height: 1.5;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease;
}

.button-secondary:hover {
  color: var(--mute);
}

.button-tab {
  background-color: transparent;
  color: var(--mute);
  border-radius: var(--rounded-none);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-bottom: 2px solid transparent;
}

.button-tab-active {
  color: var(--ink);
  border-bottom: 2px solid var(--ash);
}

.tab-strip {
  display: flex;
  border-bottom: 1px solid var(--hairline-strong);
  margin-bottom: var(--spacing-lg);
  overflow-x: auto;
}


.section {
  margin-top: var(--spacing-section);
  margin-bottom: var(--spacing-section);
}

.section-title {
  margin-bottom: var(--spacing-lg);
}


.company-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--spacing-sm);
}

.company-list-item {
  padding: var(--spacing-md) var(--spacing-xs);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-decoration: none;
  color: var(--ink);
  transition: all 0.1s ease-in-out;
}

.company-list-item:hover {
  background-color: var(--surface-soft);
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
  border-radius: var(--rounded-sm);
}


.problem-row {
  background-color: var(--canvas);
  color: var(--body);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.problem-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.problem-title {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.problem-meta {
  color: var(--mute);
  font-size: 14px;
}

.problem-actions {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  margin-top: var(--spacing-sm);
}


.text-input {
  background-color: var(--surface-soft);
  color: var(--ink);
  border: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 16px;
  border-radius: var(--rounded-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  height: 40px;
  width: 100%;
}

.text-input:focus {
  background-color: var(--canvas);
  border-color: var(--ink);
}


.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
  color: var(--ink);
  font-size: 14px;
}

.checkbox-label input {
  display: none;
}

.checkbox-custom {
  font-family: var(--font-mono);
  color: var(--ink);
}


.controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

select.text-input {
  width: auto;
  cursor: pointer;
}


body.focus-mode .problem-meta {
  display: none !important;
}

body.focus-mode .difficulty-indicator {
  display: none !important;
}

.footer-section {
  background-color: var(--canvas);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--hairline);
  margin-top: var(--spacing-section);
  font-size: 14px;
  line-height: 2;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
}


.badge-diff-Easy { color: #30d158; }
.badge-diff-Medium { color: #ff9f0a; }
.badge-diff-Hard { color: #ff3b30; }

.difficulty-indicator {
  display: inline-block;
  font-weight: 700;
}


.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 0, 0, 0.4);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 10vh;
}

.search-modal-content {
  background-color: var(--surface-dark);
  color: var(--on-dark);
  width: 100%;
  max-width: 720px;
  border-radius: var(--rounded-none);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  max-height: 80vh;
}

.search-header {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.tui-input {
  background-color: var(--surface-dark-elevated);
  color: var(--on-dark);
  border: none;
  font-size: 18px;
}
.tui-input:focus {
  background-color: var(--surface-dark-elevated);
  border: 1px solid var(--mute);
}

.search-toggles {
  display: flex;
  gap: var(--spacing-lg);
  font-size: 14px;
  color: var(--ash);
}

.search-toggle {
  cursor: pointer;
}

.search-toggle.active {
  color: var(--on-dark);
  font-weight: 500;
}

.search-results {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  border-top: 1px solid var(--charcoal);
  padding-top: var(--spacing-md);
}

.search-result-item {
  padding: var(--spacing-md);
  background-color: var(--charcoal);
  cursor: pointer;
  text-decoration: none;
  color: var(--on-dark);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.search-result-item:hover {
  background-color: var(--mute);
}

.search-result-meta {
  font-size: 14px;
  color: var(--ash);
}

.search-result-company-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: var(--spacing-xs);
}

.search-company-link {
  color: var(--on-dark);
  background-color: var(--ink-deep);
  padding: 2px 8px;
  text-decoration: none;
  border-radius: var(--rounded-sm);
  font-size: 12px;
}
.search-company-link:hover {
  background-color: var(--primary);
}

.search-company-logo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s ease-in-out;
}
.search-company-logo-link:hover {
  transform: scale(1.2);
}

.heatmap-cell {
  position: relative;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease;
}

.heatmap-cell:hover {
  transform: scale(1.3);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  z-index: 10;
}

.heatmap-cell[data-tooltip]::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 150%;
  left: 50%;
  transform: translateX(-50%) translateY(10px) scale(0.95);
  background-color: var(--ink);
  color: var(--canvas);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 10px;
  font-family: var(--font-mono);
  white-space: pre;
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 20;
  line-height: 1.4;
  text-align: left;
}

.heatmap-cell[data-tooltip]:hover::before {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}


.profile-dropdown-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
}

.profile-pill {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 4px 12px 4px 4px;
  background-color: var(--surface-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-full);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: all 0.2s ease;
}

.profile-pill:hover {
  background-color: var(--surface-card);
  border-color: var(--stone);
}

.profile-img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
}

.profile-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.profile-dropdown-menu {
  position: absolute;
  bottom: calc(100% + var(--spacing-xs));
  right: 0;
  width: 280px;
  background-color: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-md);
  padding: var(--spacing-md);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100;
}

@media (hover: hover) {
  .profile-dropdown-container:hover .profile-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }
}

.profile-dropdown-container.active .profile-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.profile-message {
  font-size: 13px;
  line-height: 1.5;
  color: var(--body);
  margin-bottom: var(--spacing-md);
}

.profile-socials {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.social-link {
  display: block;
  font-size: 13px;
  color: #007aff;
  text-decoration: none;
  font-weight: 500;
  padding: 6px 8px;
  border-radius: var(--rounded-sm);
  background-color: var(--surface-soft);
  transition: background-color 0.2s;
  text-align: center;
}

.social-link:hover {
  background-color: var(--hairline);
}


.scroll-to-top {
  position: fixed;
  bottom: 80px;
  right: 24px;
  width: 44px;
  height: 44px;
  background-color: #fdfcfc;
  color: #201d1d;
  border: 1px solid #e4e4e7;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 900;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background-color: var(--surface-soft);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}


.mobile-controls {
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
}

.mobile-menu-btn, .mobile-search-btn {
  background: none;
  border: none;
  color: var(--ink);
  cursor: pointer;
  padding: var(--spacing-xs);
}


@media (max-width: 768px) {
  
  .nav-container, .footer-container, #app {
    padding: 0 var(--spacing-lg);
  }

  
  .display-xl {
    font-size: 24px;
  }
  .heading-lg {
    font-size: 22px;
  }
  
  
  .nav-container {
    flex-wrap: wrap;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
  }
  .primary-nav {
    height: auto;
  }
  .mobile-controls {
    display: flex;
  }
  .nav-links {
    width: 100%;
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-sm);
  }
  .nav-links.show {
    display: grid;
  }
  #search-btn {
    display: none;
  }

  
  .button-tab {
    padding: var(--spacing-sm) var(--spacing-sm);
    font-size: 13px;
  }
  .filter-pill {
    padding: 4px 8px;
    font-size: 11px;
  }
  .controls-row {
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
  
  
  .problem-row-inner {
    flex-direction: column !important;
    gap: var(--spacing-sm) !important;
  }
  .problem-title {
    font-size: 15px;
  }
  .problem-meta {
    font-size: 12px;
  }
  .problem-actions {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  .action-box {
    padding: 2px 8px;
    font-size: 12px;
  }
  
  
  .account-header {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: var(--spacing-sm);
  }
  .account-actions {
    flex-wrap: wrap;
    width: 100%;
  }
  .account-actions .button-secondary {
    font-size: 13px;
    padding: 4px 8px;
    background-color: var(--surface-soft);
    border-radius: var(--rounded-sm);
  }
  .account-stats-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: var(--spacing-sm);
  }
  .stat-card {
    padding: var(--spacing-md);
  }
  .stat-value {
    font-size: 24px;
  }
  .stat-label {
    font-size: 10px;
    text-align: center;
  }
  
  
  .search-modal-content {
    padding: var(--spacing-md);
    max-height: 90vh;
    width: calc(100% - 32px);
    margin: 0 auto;
    border-radius: var(--rounded-md);
  }
  .search-overlay {
    padding-top: 16px;
  }
  .tui-input {
    font-size: 16px;
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  
  .scroll-to-top {
    width: 36px;
    height: 36px;
    bottom: 80px;
    right: 16px;
  }
  
  
  .profile-dropdown-container {
    bottom: 16px;
    right: 16px;
  }
  
  
  .heatmap-wrapper {
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
    -webkit-overflow-scrolling: touch;
  }
  .heatmap-grid {
    min-width: 600px; 
  }
}