.help-hero {
      background: linear-gradient(135deg, rgba(79,142,247,0.12) 0%, rgba(139,92,246,0.08) 100%);
      border: 1px solid rgba(79,142,247,0.15);
      border-radius: var(--radius-xl);
      padding: 36px 32px 28px;
      margin-bottom: 28px;
      position: relative;
      overflow: hidden;
    }
    .help-hero::before {
      content: '';
      position: absolute;
      top: -40%; right: -10%;
      width: 260px; height: 260px;
      background: radial-gradient(circle, rgba(79,142,247,0.1) 0%, transparent 70%);
      pointer-events: none;
    }
    .help-hero-label {
      font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em;
      text-transform: uppercase; color: var(--accent-blue); margin-bottom: 10px;
    }
    .help-hero h1 {
      font-size: clamp(1.5rem, 4vw, 2rem); font-weight: 800;
      color: var(--text-primary); margin-bottom: 10px; line-height: 1.2;
    }
    .help-hero p { font-size: 0.9rem; color: var(--text-secondary); max-width: 560px; line-height: 1.6; }

    .mask-section {
      background: var(--bg-card); border: 1px solid var(--border-subtle);
      border-radius: var(--radius-xl); padding: 28px; margin-bottom: 20px;
    }
    .mask-section h2 {
      font-size: 1rem; font-weight: 700; color: var(--text-primary);
      margin-bottom: 18px; display: flex; align-items: center; gap: 8px;
    }
    .mask-cells-wrap { margin-bottom: 20px; }
    .mask-cells-wrap > label {
      font-size: 0.8rem; font-weight: 600; color: var(--text-muted);
      letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px; display: block;
    }
    .mask-cells-row {
      display: flex; flex-wrap: wrap; gap: 5px;
      align-items: center; margin-bottom: 12px;
    }
    .mask-cell-wrap {
      position: relative;
      display: inline-flex;
    }
    .mask-cell-num {
      position: absolute;
      top: 3px;
      left: 5px;
      z-index: 1;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.55rem;
      line-height: 1;
      font-weight: 700;
      color: var(--text-muted);
      opacity: 0.8;
      pointer-events: none;
    }
    .mask-cell {
      width: 38px; height: 42px;
      background: var(--bg-secondary); border: 2px solid var(--border-normal);
      border-radius: 6px; text-align: center;
      font-family: 'JetBrains Mono', monospace; font-size: 1rem; font-weight: 700;
      color: var(--text-primary); text-transform: uppercase;
      caret-color: var(--accent-blue);
      transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
      outline: none;
    }
    .mask-cell:focus {
      border-color: var(--accent-blue);
      background: rgba(79,142,247,0.06);
      box-shadow: 0 0 0 3px rgba(79,142,247,0.15);
    }
    .mask-cell.has-letter {
      border-color: var(--accent-blue);
      color: var(--accent-blue);
      background: rgba(79,142,247,0.07);
    }
    .mask-cell-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
    .cell-count-badge {
      font-size: 0.8rem; font-weight: 700; color: var(--text-muted);
      background: var(--bg-secondary); border: 1px solid var(--border-normal); padding: 4px 12px;
      font-family: 'JetBrains Mono', monospace; transition: color 0.2s, background 0.2s;
    }
    .cell-count-badge.active { color: var(--accent-blue); background: rgba(79,142,247,0.1); border-color: rgba(79,142,247,0.3); }

    .mask-divider {
      display: flex; align-items: center; gap: 12px; margin: 20px 0;
      color: var(--text-muted); font-size: 0.78rem; font-weight: 600;
      letter-spacing: 0.08em; text-transform: uppercase;
    }
    .mask-divider::before, .mask-divider::after {
      content: ''; flex: 1; height: 1px; background: var(--border-subtle);
    }

    .mask-text-row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
    .mask-text-row .form-group { flex: 1; min-width: 200px; }

    .mask-filters {
      display: flex; gap: 12px; flex-wrap: wrap;
      margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-subtle);
    }
    .mask-filters label { font-size: 0.78rem; color: var(--text-muted); font-weight: 600; margin-bottom: 4px; display: block; }
    .filter-group { min-width: 120px; }

    .btn-search-mask {
      background: linear-gradient(135deg, var(--accent-blue), #7c3aed);
      color: #fff; border: none; border-radius: var(--radius-md);
      padding: 11px 28px; font-size: 0.9rem; font-weight: 700;
      cursor: pointer; transition: opacity 0.2s, transform 0.15s;
      white-space: nowrap; align-self: flex-end;
    }
    .btn-search-mask:hover { opacity: 0.88; transform: translateY(-1px); }
    .btn-search-mask:active { transform: translateY(0); }
    .mask-text-row .clue-search-submit-btn {
      width: 43px;
      height: 43px;
      min-width: 44px;
      padding: 0;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 0;
      border-radius: 14px;
      background: var(--accent-blue);
      cursor: pointer;
      align-self: flex-end;
      box-sizing: border-box;
      transition: opacity .18s ease, transform .18s ease;
    }
    .mask-text-row .clue-search-submit-btn:hover {
      opacity: .9;
      transform: translateY(-1px);
    }

    .results-section { margin-bottom: 24px; }
    .results-header {
      display: flex; align-items: center; justify-content: space-between;
      margin-bottom: 16px; flex-wrap: wrap; gap: 8px;
    }
    .results-header h2 { font-size: 1rem; font-weight: 700; color: var(--text-primary); }
    .results-count {
      font-size: 0.78rem; color: var(--text-muted); background: var(--bg-secondary);
      border: 1px solid var(--border-normal); border-radius: var(--radius-full);
      padding: 3px 12px; font-family: 'JetBrains Mono', monospace; font-weight: 600;
    }
    .results-grid {
      display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px;
    }
    .result-card {
      background: var(--bg-card); border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg); padding: 14px 16px;
      display: flex; align-items: center; gap: 12px; cursor: pointer;
      transition: border-color 0.2s, background 0.2s, transform 0.15s; text-decoration: none;
    }
    .result-card:hover { border-color: var(--border-accent); background: var(--bg-glass-hover); transform: translateY(-1px); }
    .result-letters { display: flex; gap: 2px; flex-wrap: wrap; flex: 1; }
    .result-letter {
      width: 24px; height: 26px; background: var(--accent-blue-soft);
      border: 1px solid rgba(79,142,247,0.2); border-radius: 4px;
      display: flex; align-items: center; justify-content: center;
      position: relative;
      font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; font-weight: 700;
      color: var(--accent-blue); text-transform: uppercase;
    }
    .result-letter-num {
      position: absolute;
      top: 1px;
      left: 3px;
      font-size: 0.45rem;
      line-height: 1;
      font-weight: 700;
      color: var(--text-muted);
      opacity: 0.75;
    }
    .result-letter-char {
      display: inline-block;
      line-height: 1;
    }
    .result-letter.matched { background: rgba(245,158,11,0.15); border-color: rgba(245,158,11,0.3); color: #fbbf24; }
    .result-meta { text-align: right; flex-shrink: 0; }
    .result-len { font-size: 0.72rem; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; }

    .results-empty {
      text-align: center; padding: 48px 24px; background: var(--bg-card);
      border: 1px dashed var(--border-normal); border-radius: var(--radius-xl); color: var(--text-muted);
    }
    .results-empty .empty-icon { font-size: 48px; margin-bottom: 12px; }
    .results-empty p { font-size: 0.88rem; }

    .tips-block {
      background: var(--bg-card); border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg); padding: 20px 24px; margin-bottom: 20px;
    }
    .tips-block h3 { font-size: 0.88rem; font-weight: 700; color: var(--text-primary); margin-bottom: 12px; }
    .tips-list { display: flex; flex-direction: column; gap: 8px; }
    .tip-item { display: flex; gap: 10px; align-items: flex-start; font-size: 0.82rem; color: var(--text-secondary); }
    .tip-tag {
      background: rgba(79,142,247,0.12); color: var(--accent-blue);
      border: 1px solid rgba(79,142,247,0.2); border-radius: 4px;
      padding: 2px 7px; font-family: 'JetBrains Mono', monospace;
      font-size: 0.76rem; font-weight: 700; white-space: nowrap; flex-shrink: 0;
    }

    :root:not(.dark) .mask-cell { background: #f8fafc; border-color: #cbd5e1; color: #1e293b; }
    :root:not(.dark) .mask-cell:focus { background: rgba(79,142,247,0.05); }
    :root:not(.dark) .mask-cell.has-letter { background: rgba(79,142,247,0.06); }
    :root:not(.dark) .result-card { background: #fff; }
    :root:not(.dark) .result-card:hover { background: #f8fafc; }
    :root:not(.dark) .tips-block { background: #fff; }

.quick-example {
    display: flex; align-items: center; justify-content: space-between;
    width: 100%; background: var(--bg-secondary); border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md); padding: 10px 12px; font-size: 0.82rem;
    color: var(--text-secondary); cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
  }
  .quick-example:hover { background: var(--bg-glass-hover); border-color: var(--border-accent); }
  :root:not(.dark) .quick-example { background: #f8fafc; }

/* ===== Square Template Override ===== */
:root {
  --radius-sm: 0;
  --radius-md: 0;
  --radius-lg: 0;
  --radius-xl: 0;
  --radius-full: 0;
}

*,
*::before,
*::after {
  border-radius: 0 !important;
}

button,
.btn,
.nav-btn,
.nav-toggle,
.nav-logout,
.social-btn,
.clue-search-submit-btn,
.btn-search-mask,
.mask-toggle-btn,
.mask-close-btn,
.profile-widget-btn,
.answer-admin-btn,
.vote-btn,
.btn-like,
.btn-dislike,
.btn-reply,
input,
textarea,
select,
.form-input,
.form-select,
.form-textarea {
  border-radius: 0 !important;
}

button,
.btn,
.nav-btn,
.nav-toggle,
.nav-logout,
.social-btn,
.clue-search-submit-btn,
.btn-search-mask,
.mask-toggle-btn,
.mask-close-btn,
.profile-widget-btn,
.answer-admin-btn,
.vote-btn,
.btn-like,
.btn-dislike,
.btn-reply {
  border-width: 1px !important;
  border-style: solid !important;
}

input,
textarea,
select,
.form-input,
.form-select,
.form-textarea {
  border-width: 1px !important;
  border-style: solid !important;
}