:root {
    --bg: #0B0E14;
    --panel: #151922;
    --panel-glass: rgba(255,255,255,0.035);
    --panel-glass-strong: rgba(255,255,255,0.06);
    --border: rgba(212,175,106,0.14);
    --border-strong: rgba(212,175,106,0.32);
    --gold: #D4AF6A;
    --gold-bright: #E8C989;
    --gold-dim: #8A7040;
    --text: #EDEAE3;
    --text-dim: #8A93A3;
    --text-faint: #545E6E;
    --emerald: #4A9B7F;
    --rose: #B8615A;
    --shadow: rgba(0,0,0,0.45);
    --sidebar-w: 248px;
  }

  [data-theme="light"] {
    --bg: #F6F4EF;
    --panel: #FFFFFF;
    --panel-glass: rgba(255,255,255,0.55);
    --panel-glass-strong: rgba(255,255,255,0.75);
    --border: rgba(169,130,26,0.18);
    --border-strong: rgba(169,130,26,0.4);
    --gold: #A9821A;
    --gold-bright: #8C6B14;
    --gold-dim: #C9AC5F;
    --text: #201D18;
    --text-dim: #6B6558;
    --text-faint: #A39C8C;
    --emerald: #2F7A5F;
    --rose: #9C4A43;
    --navy: #1D3557;
    --navy-deep: #10233F;
    --shadow: rgba(120,110,90,0.18);
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    transition: background 0.4s ease, color 0.4s ease;
    background-image:
      radial-gradient(ellipse 900px 500px at 15% -5%, rgba(212,175,106,0.08), transparent 60%),
      radial-gradient(ellipse 700px 500px at 100% 0%, rgba(74,155,127,0.05), transparent 60%);
    background-attachment: fixed;
  }
  [data-theme="light"] body {
    background-image:
      radial-gradient(circle 500px at 8% 12%, rgba(29,53,87,0.18), rgba(29,53,87,0.08) 45%, transparent 78%),
      radial-gradient(circle 460px at 88% 8%, rgba(126,200,227,0.26), rgba(126,200,227,0.11) 45%, transparent 78%),
      radial-gradient(circle 480px at 18% 55%, rgba(126,200,227,0.20), rgba(126,200,227,0.09) 45%, transparent 78%),
      radial-gradient(circle 520px at 78% 50%, rgba(29,53,87,0.16), rgba(29,53,87,0.07) 45%, transparent 78%),
      radial-gradient(circle 470px at 35% 92%, rgba(126,200,227,0.19), rgba(126,200,227,0.08) 45%, transparent 78%),
      radial-gradient(circle 440px at 95% 88%, rgba(29,53,87,0.17), rgba(29,53,87,0.07) 45%, transparent 78%);
    background-attachment: fixed;
  }

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

  /* ---------- SIDEBAR ---------- */
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    width: var(--sidebar-w);
    background: var(--panel-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 28px 18px;
    z-index: 100;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px 28px 8px;
    margin-bottom: 22px;
    border-bottom: 1px solid var(--border);
  }
  .brand-mark {
    width: 30px; height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--gold-bright), var(--gold-dim));
    display: flex; align-items: center; justify-content: center;
    font-family: 'Fraunces', serif;
    font-weight: 700;
    font-size: 15px;
    color: #14110A;
    flex-shrink: 0;
  }
  .brand-name {
    font-family: 'Fraunces', serif;
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 0.01em;
  }
  .brand-sub {
    font-size: 10px;
    color: var(--text-faint);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-top: 1px;
  }

  .nav-group { margin-bottom: 22px; }
  .nav-label {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-faint);
    padding: 0 10px;
    margin-bottom: 8px;
    font-weight: 600;
  }
  .nav-item {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 9px 10px;
    border-radius: 9px;
    font-size: 13.5px;
    color: var(--text-dim);
    font-weight: 500;
    margin-bottom: 2px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    position: relative;
  }
  .nav-item svg { width: 17px; height: 17px; flex-shrink: 0; opacity: 0.85; }
  .nav-item:hover { background: var(--panel-glass-strong); color: var(--text); }
  .nav-item.active {
    background: linear-gradient(90deg, rgba(212,175,106,0.14), rgba(212,175,106,0.02));
    color: var(--gold-bright);
    border: 1px solid var(--border-strong);
  }
  .nav-item.active svg { opacity: 1; }
  .nav-badge {
    margin-left: auto;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    background: rgba(212,175,106,0.15);
    color: var(--gold);
    padding: 1px 6px;
    border-radius: 20px;
  }

  .sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border);
  }
  .theme-toggle {
    display: flex;
    align-items: center;
    background: var(--panel-glass-strong);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
    gap: 2px;
  }
  .theme-toggle button, .theme-toggle a {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-faint);
    font-family: 'Inter', sans-serif;
    font-size: 11.5px;
    font-weight: 600;
    padding: 7px 0;
    border-radius: 7px;
    cursor: pointer;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all 0.2s ease;
  }
  .theme-toggle button svg, .theme-toggle a svg { width: 13px; height: 13px; }
  .theme-toggle button.active, .theme-toggle a.active {
    background: var(--gold);
    color: #14110A;
  }

  /* ---------- MAIN ---------- */
  .main {
    margin-left: var(--sidebar-w);
    padding: 30px 40px 60px;
    max-width: 1280px;
  }

  .topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 34px;
  }
  .eyebrow {
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--gold);
    font-weight: 600;
    margin-bottom: 8px;
  }
  h1.page-title {
    font-family: 'Fraunces', serif;
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.01em;
  }
  .page-sub { color: var(--text-dim); font-size: 13.5px; margin-top: 6px; }

  .search-box {
    display: flex; align-items: center; gap: 9px;
    background: var(--panel-glass);
    border: 1px solid var(--border);
    border-radius: 11px;
    padding: 10px 14px;
    width: 280px;
    backdrop-filter: blur(12px);
  }
  .search-box svg { width: 15px; height: 15px; color: var(--text-faint); flex-shrink: 0; }
  .search-box input {
    background: transparent; border: none; outline: none;
    color: var(--text); font-size: 13px; width: 100%;
    font-family: 'Inter', sans-serif;
  }
  .search-box input::placeholder { color: var(--text-faint); }

  /* ---------- MEDAL RING STATS ---------- */
  .stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 28px;
  }
  .stat-card {
    background: var(--panel-glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: border-color 0.2s ease, transform 0.2s ease;
  }
  .stat-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }

  .ring-wrap { position: relative; width: 58px; height: 58px; flex-shrink: 0; }
  .ring-wrap svg { transform: rotate(-90deg); }
  .ring-bg { fill: none; stroke: var(--border); stroke-width: 5; }
  .ring-fg { fill: none; stroke: var(--gold); stroke-width: 5; stroke-linecap: round; transition: stroke-dashoffset 1s ease; }
  .ring-fg.emerald { stroke: var(--emerald); }
  .ring-center {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px; font-weight: 500;
  }
  .stat-info .stat-num {
    font-family: 'Fraunces', serif;
    font-size: 22px;
    font-weight: 600;
  }
  .stat-info .stat-label {
    font-size: 11.5px;
    color: var(--text-dim);
    margin-top: 2px;
  }

  /* ---------- GRID LAYOUT ---------- */
  .grid-2 { display: grid; grid-template-columns: 1.6fr 1fr; gap: 20px; }

  .panel {
    background: var(--panel-glass);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 24px;
    backdrop-filter: blur(16px);
    margin-bottom: 20px;
  }
  .panel-head {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 18px;
  }
  .panel-title {
    font-family: 'Fraunces', serif;
    font-size: 17px;
    font-weight: 600;
  }
  .panel-link { font-size: 12px; color: var(--gold); font-weight: 600; }

  /* competitions list */
  .comp-item {
    display: flex; align-items: center; gap: 14px;
    padding: 13px 10px;
    border-radius: 11px;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    cursor: pointer;
  }
  .comp-item:hover { background: var(--panel-glass-strong); border-color: var(--border); }
  .comp-icon {
    width: 38px; height: 38px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 15px; flex-shrink: 0;
    background: linear-gradient(135deg, rgba(212,175,106,0.22), rgba(212,175,106,0.05));
    border: 1px solid var(--border);
  }
  .comp-name { font-size: 13.5px; font-weight: 600; }
  .comp-meta { font-size: 11.5px; color: var(--text-faint); margin-top: 2px; }
  .comp-tag {
    margin-left: auto;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10.5px;
    padding: 3px 9px;
    border-radius: 20px;
    white-space: nowrap;
  }
  .tag-live { background: rgba(74,155,127,0.15); color: var(--emerald); }
  .tag-closing { background: rgba(184,97,90,0.15); color: var(--rose); }
  .tag-new { background: rgba(212,175,106,0.15); color: var(--gold); }

  /* activity feed */
  .feed-item { display: flex; gap: 12px; padding: 11px 4px; border-bottom: 1px solid var(--border); }
  .feed-item:last-child { border-bottom: none; }
  .feed-dot {
    width: 7px; height: 7px; border-radius: 50%; background: var(--gold);
    margin-top: 6px; flex-shrink: 0;
  }
  .feed-text { font-size: 12.5px; line-height: 1.5; color: var(--text-dim); }
  .feed-text strong { color: var(--text); font-weight: 600; }
  .feed-time { font-size: 10.5px; color: var(--text-faint); margin-top: 2px; font-family: 'IBM Plex Mono', monospace; }

  /* team chips */
  .team-chip {
    display: flex; align-items: center; gap: 10px;
    padding: 10px; border-radius: 11px;
    background: var(--panel-glass-strong);
    border: 1px solid var(--border);
    margin-bottom: 8px;
  }
  .avatar-stack { display: flex; }
  .avatar-stack .avatar { margin-left: -8px; }
  .avatar-stack .avatar:first-child { margin-left: 0; }
  .avatar {
    width: 26px; height: 26px; border-radius: 50%;
    background: linear-gradient(135deg, var(--gold-bright), var(--gold-dim));
    border: 2px solid var(--panel);
    display: flex; align-items: center; justify-content: center;
    font-size: 10px; font-weight: 700; color: #14110A;
  }
  .team-info .team-name { font-size: 12.5px; font-weight: 600; }
  .team-info .team-meta { font-size: 10.5px; color: var(--text-faint); }

  /* dataset cards */
  .dataset-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
  .dataset-card {
    background: var(--panel-glass-strong);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    transition: border-color 0.2s ease;
    cursor: pointer;
  }
  .dataset-card:hover { border-color: var(--border-strong); }
  .dataset-verified {
    display: inline-flex; align-items: center; gap: 4px;
    font-size: 10px; color: var(--emerald); font-weight: 600;
    margin-bottom: 8px;
  }
  .dataset-title { font-size: 13.5px; font-weight: 600; margin-bottom: 5px; }
  .dataset-meta { font-size: 11px; color: var(--text-faint); }

  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; }

/* ---------- ACCOUNT BAR (topbar-right: bell + avatar dropdown) ---------- */
.account-bar {
  position: fixed;
  top: 24px;
  right: 40px;
  display: flex;
  align-items: center;
  gap: 14px;
  z-index: 200;
}

/* Reserve space so page-specific topbar content (buttons, search, edit/
   delete links) never renders underneath the fixed account bar above. */
.topbar {
  padding-right: 130px;
}

.icon-btn {
  position: relative;
  width: 38px; height: 38px;
  border-radius: 10px;
  background: var(--panel-glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(16px);
  color: var(--text-dim);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text); }
.icon-btn svg { width: 17px; height: 17px; }

.icon-badge {
  position: absolute;
  top: -5px; right: -5px;
  background: var(--rose);
  color: #fff;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  font-weight: 600;
  min-width: 16px; height: 16px;
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 3px;
}

.account-menu-wrap { position: relative; }

.account-trigger {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  font-size: 13px;
  margin-left: 0;
}

.account-dropdown {
  display: none;
  position: absolute;
  top: 48px; right: 0;
  min-width: 200px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 12px 32px var(--shadow);
  backdrop-filter: blur(20px);
  z-index: 300;
}
.account-dropdown.open { display: block; }
.account-dropdown hr { border: none; border-top: 1px solid var(--border); margin: 10px 0; }
.account-dropdown-name { font-size: 13px; font-weight: 600; }
.account-dropdown-email { font-size: 11px; color: var(--text-faint); margin-top: 2px; }
.account-dropdown-link {
  display: block;
  padding: 8px 6px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-dim);
  text-decoration: none;
}
.account-dropdown-link:hover { background: var(--panel-glass-strong); color: var(--text); }

/* ---------- SUBMIT-TO-COMPETITION MODAL ---------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(11,14,20,0.72);
  backdrop-filter: blur(4px);
  z-index: 500;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }

.modal-panel {
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  padding: 24px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
}

.dropzone {
  border: 1.5px dashed var(--border-strong);
  border-radius: 14px;
  padding: 32px 20px;
  text-align: center;
  background: var(--panel-glass);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.dropzone.dragover {
  border-color: var(--gold);
  background: rgba(212,175,106,0.08);
}

/* ---------- NOTEBOOK VIEWER ---------- */
.nb-cell { margin-bottom: 14px; }
.nb-markdown { font-size: 14px; color: var(--text-dim); line-height: 1.7; }
.nb-markdown h1, .nb-markdown h2, .nb-markdown h3, .nb-markdown h4 { color: var(--text); font-family: 'Fraunces', serif; margin: 14px 0 8px; }
.nb-markdown code { background: var(--panel-glass-strong); padding: 1px 5px; border-radius: 4px; font-family: 'IBM Plex Mono', monospace; font-size: 12.5px; }
.nb-markdown a { color: var(--gold); }
.nb-markdown ul { padding-left: 20px; }

.nb-code pre {
  background: #0A0C11;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12.5px;
  color: #C9D1D9;
  line-height: 1.6;
  margin: 0;
}

.nb-output {
  background: rgba(255,255,255,0.02);
  border-left: 2px solid var(--border-strong);
  padding: 10px 14px;
  margin-top: 6px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--text-faint);
  white-space: pre-wrap;
  overflow-x: auto;
}
.nb-error { border-left-color: var(--rose); color: var(--rose); }
.nb-output-img { max-width: 100%; margin-top: 8px; border-radius: 8px; border: 1px solid var(--border); }

.nb-tag {
  display: inline-flex;
  align-items: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--gold);
  background: rgba(212,175,106,0.1);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
}
.nb-tag:hover { border-color: var(--border-strong); background: rgba(212,175,106,0.16); }

/* ---------- Onboarding walkthrough ---------- */
.tour-dim {
  position: fixed; inset: 0;
  background: rgba(10,8,4,0.55);
  z-index: 998;
  animation: tourFadeIn 0.25s ease;
}
[data-theme="light"] .tour-dim { background: rgba(30,25,15,0.35); }

@keyframes tourFadeIn { from { opacity: 0; } to { opacity: 1; } }

.tour-highlight {
  position: relative;
  z-index: 999 !important;
  box-shadow: 0 0 0 4px var(--gold), 0 0 0 9999px rgba(10,8,4,0.55);
  border-radius: 12px;
  animation: tourPulse 1.6s ease-in-out infinite;
}
[data-theme="light"] .tour-highlight {
  box-shadow: 0 0 0 4px var(--gold), 0 0 0 9999px rgba(30,25,15,0.35);
}

@keyframes tourPulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--gold), 0 0 0 9999px rgba(10,8,4,0.55); }
  50% { box-shadow: 0 0 0 7px var(--gold-bright), 0 0 0 9999px rgba(10,8,4,0.55); }
}

.tour-bubble {
  position: fixed;
  z-index: 1000;
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 18px 20px;
  max-width: 280px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
  font-family: 'Inter', sans-serif;
  animation: tourBubbleIn 0.2s ease;
}
@keyframes tourBubbleIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.tour-bubble-title {
  font-family: 'Fraunces', serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-bright);
  margin-bottom: 6px;
}
.tour-bubble-text {
  font-size: 12.5px;
  color: var(--text-dim);
  line-height: 1.55;
  margin-bottom: 14px;
}
.tour-bubble-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.tour-bubble-step {
  font-size: 11px;
  color: var(--text-faint);
  font-family: 'IBM Plex Mono', monospace;
}
.tour-bubble-actions { display: flex; gap: 8px; }
.tour-btn {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
}
.tour-btn-primary {
  background: var(--gold);
  color: #14110A;
  border: none;
}