@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: #050505;
  color: #e2e8f0;
  min-height: 100vh;
}

a {
  text-decoration: none;
}

.contests-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* Header */
.contests-header {
  margin-bottom: 32px;
}

.section-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #60a5fa;
  margin-bottom: 8px;
}

.contests-header h1 {
  font-size: 28px;
  font-weight: 800;
  color: #f8fafc;
  margin-bottom: 8px;
}

.contests-header p {
  font-size: 14px;
  color: #94a3b8;
  max-width: 560px;
}

/* Tabs */
.contests-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.contests-tabs button {
  padding: 10px 20px;
  border: none;
  background: transparent;
  color: #94a3b8;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.contests-tabs button.active {
  color: #60a5fa;
  border-bottom-color: #60a5fa;
}

.contests-tabs button:hover {
  color: #e2e8f0;
}

/* Panels */
.contest-panel {
  display: none;
}

.contest-panel.active {
  display: block;
}

/* Contest cards */
.contest-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 20px 24px;
  background: rgba(255, 255, 255, 0.02);
  margin-bottom: 12px;
  transition: border-color 0.2s;
}

.contest-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.contest-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.contest-card-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: #f8fafc;
}

.contest-status {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 999px;
}

.contest-status.upcoming {
  background: rgba(96, 165, 250, 0.12);
  color: #60a5fa;
}

.contest-status.active {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
}

.contest-status.ended {
  background: rgba(148, 163, 184, 0.12);
  color: #94a3b8;
}

.contest-card-desc {
  font-size: 13px;
  color: #94a3b8;
  margin-bottom: 10px;
}

.contest-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: #64748b;
}

.contest-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.contest-card-actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
}

.btn {
  padding: 8px 18px;
  border: none;
  border-radius: 8px;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

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

/* Forms */
.contest-form-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 28px;
  align-items: start;
}

.contest-form-left {
  min-width: 0;
}

.contest-form-right label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 6px;
}

.contest-form {
  max-width: 520px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: #f8fafc;
  font: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: #60a5fa;
}

.form-group textarea {
  min-height: 80px;
  resize: vertical;
}

.form-group select {
  cursor: pointer;
  appearance: auto;
}

.form-row {
  display: flex;
  gap: 14px;
}

.form-row .form-group {
  flex: 1;
}

.form-hint {
  font-size: 12px;
  color: #64748b;
  margin-top: 4px;
}

/* Join contest section */
.join-section {
  display: flex;
  gap: 10px;
  max-width: 420px;
  margin-bottom: 24px;
}

.join-section input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: #f8fafc;
  font: inherit;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  outline: none;
}

.join-section input:focus {
  border-color: #60a5fa;
}

/* Empty state */
.empty-state {
  font-size: 14px;
  color: #64748b;
  padding: 40px 0;
  text-align: center;
}

/* Loading */
.loading-text {
  font-size: 14px;
  color: #64748b;
  padding: 40px 0;
  text-align: center;
}

/* Countdown */
.countdown {
  font-size: 14px;
  font-weight: 700;
  color: #f8fafc;
  margin-top: 4px;
}

.countdown.urgent {
  color: #f87171;
}

/* Contest search */
.contests-search{
  margin-bottom: 24px;
}

.contests-search .search-input{
  width: 100%;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: #f8fafc;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
  margin-bottom: 12px;
}

.contests-search .search-input:focus{
  border-color: #60a5fa;
}

.contests-search .search-input::placeholder{
  color: #64748b;
}

.contests-search .filter-row{
  display: flex;
  gap: 12px;
  align-items: center;
}

.contests-search .results-count{
  margin-top: 10px;
  font-size: 13px;
  color: #64748b;
}

.status-filters{
  display: flex;
  gap: 6px;
}

.contests-search .filter-btn{
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  background: transparent;
  color: #64748b;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.contests-search .filter-btn:hover{
  color: #cbd5e1;
  border-color: rgba(255, 255, 255, 0.15);
}

.contests-search .filter-btn.active{
  color: #f8fafc;
  background: rgba(96, 165, 250, 0.12);
  border-color: #60a5fa;
}

.contests-search .filter-btn.active-status.active{
  color: #22c55e;
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.4);
}

.contests-search .filter-btn.upcoming-status.active{
  color: #60a5fa;
  background: rgba(96, 165, 250, 0.12);
  border-color: rgba(96, 165, 250, 0.4);
}

.contests-search .filter-btn.ended-status.active{
  color: #94a3b8;
  background: rgba(148, 163, 184, 0.12);
  border-color: rgba(148, 163, 184, 0.4);
}

/* Problem picker toolbar */
.problem-picker-toolbar {
  margin-bottom: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.problem-search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: #f8fafc;
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

.problem-search-input:focus {
  border-color: #60a5fa;
}

.problem-search-input::placeholder {
  color: #64748b;
}

.problem-difficulty-filters {
  display: flex;
  gap: 4px;
}

.pf-diff-btn {
  padding: 3px 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 5px;
  background: transparent;
  color: #64748b;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.pf-diff-btn:hover {
  color: #cbd5e1;
  border-color: rgba(255, 255, 255, 0.15);
}

.pf-diff-btn.active {
  color: #f8fafc;
  background: rgba(96, 165, 250, 0.12);
  border-color: #60a5fa;
}

.pf-diff-btn.easy.active {
  color: #22c55e;
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.4);
}

.pf-diff-btn.medium.active {
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.4);
}

.pf-diff-btn.hard.active {
  color: #f87171;
  background: rgba(248, 113, 113, 0.12);
  border-color: rgba(248, 113, 113, 0.4);
}

.problem-tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.pf-tag-btn {
  padding: 2px 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  background: transparent;
  color: #64748b;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.pf-tag-btn:hover {
  color: #cbd5e1;
  border-color: rgba(255, 255, 255, 0.15);
}

.pf-tag-btn.active {
  color: #60a5fa;
  background: rgba(96, 165, 250, 0.1);
  border-color: rgba(96, 165, 250, 0.4);
}

.problem-picker-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: #64748b;
}

.problem-picker-actions {
  display: flex;
  gap: 6px;
}

.pf-action-btn {
  padding: 2px 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  background: transparent;
  color: #64748b;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.pf-action-btn:hover {
  color: #cbd5e1;
  border-color: rgba(255, 255, 255, 0.15);
}

/* Problem checkboxes */
.problem-checkboxes {
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.problem-checkboxes label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}

.problem-checkboxes label:hover {
  background: rgba(255, 255, 255, 0.04);
}

.problem-checkboxes label.hidden {
  display: none;
}

.problem-checkboxes input[type="checkbox"] {
  accent-color: #2563eb;
}

.problem-checkboxes .problem-tags-inline {
  display: flex;
  gap: 3px;
  margin-left: auto;
  flex-shrink: 0;
}

.problem-checkboxes .problem-tag-chip {
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 3px;
  background: rgba(96, 165, 250, 0.1);
  color: #60a5fa;
  white-space: nowrap;
}

.problem-checkboxes .problem-diff-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 3px;
  white-space: nowrap;
}

.problem-checkboxes .problem-diff-badge.easy {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
}

.problem-checkboxes .problem-diff-badge.medium {
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
}

.problem-checkboxes .problem-diff-badge.hard {
  background: rgba(248, 113, 113, 0.12);
  color: #f87171;
}

.problem-checkboxes .no-results-msg {
  font-size: 13px;
  color: #64748b;
  padding: 16px 8px;
  text-align: center;
}

@media (max-width: 640px) {
  .contests-page {
    padding: 24px 16px 60px;
  }

  .contests-header h1 {
    font-size: 22px;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }

  .join-section {
    flex-direction: column;
  }
}