:root {
    --bg: #060a0e;
    --surface: #0f1520;
    --surface2: #162030;
    --surface3: #1e2d40;
    --border: #253545;
    --border2: #2e4258;
    --accent: #00d4ff;
    --accent2: #00ff9d;
    --accent3: #ff6b35;
    --accent4: #bf7fff;
    --text: #f0f8ff;
    --text2: #b0cfe8;
    --text3: #7a9dba;
    --mono: 'Space Mono', monospace;
    --sans: 'Syne', sans-serif;
    --glow: 0 0 20px rgba(0,212,255,0.15);
    --glow2: 0 0 30px rgba(0,255,157,0.1);
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
  }

  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
  }

  body::after {
    content: '';
    position: fixed;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background:
      radial-gradient(ellipse at 30% 20%, rgba(0,212,255,0.04) 0%, transparent 50%),
      radial-gradient(ellipse at 70% 80%, rgba(191,127,255,0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: drift 20s ease-in-out infinite alternate;
  }

  @keyframes drift {
    from { transform: translate(0,0) rotate(0deg); }
    to   { transform: translate(20px,10px) rotate(1deg); }
  }

  .container {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px 60px;
  }

  /* ── Header ── */
  header {
    padding: 40px 0 48px;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
  }

  .logo-group { display: flex; flex-direction: column; gap: 6px; }

  .logo-tag {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--accent4);
    letter-spacing: 3px;
    text-transform: uppercase;
  }

  .logo-title {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text);
    line-height: 1;
  }

  .logo-title span { color: var(--accent4); }

  .header-badge { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border: 1px solid var(--border2);
    border-radius: 2px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--accent2);
    letter-spacing: 1px;
    background: rgba(0,255,157,0.04);
  }

  .badge::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent2);
    box-shadow: 0 0 8px var(--accent2);
    animation: pulse 2s ease-in-out infinite;
  }

  @keyframes pulse {
    0%,100% { opacity: 1; }
    50%      { opacity: 0.3; }
  }

  /* ── Info Banner ── */
  .info-banner {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 18px;
    margin-bottom: 24px;
    background: rgba(191,127,255,0.04);
    border: 1px solid rgba(191,127,255,0.15);
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 11px;
    color: #8a7aaa;
    letter-spacing: 0.3px;
  }

  .info-banner strong { color: var(--accent4); }

  /* ── Config Panel ── */
  .config-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 28px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
  }

  .config-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent4), transparent);
    opacity: 0.5;
  }

  .config-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
  }

  .config-header-icon {
    width: 28px; height: 28px;
    border: 1px solid var(--border2);
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent4);
    font-size: 14px;
  }

  .config-title {
    font-size: 13px;
    font-weight: 600;
    color: #c0ddf0;
    letter-spacing: 2px;
    text-transform: uppercase;
  }

  .config-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .field-group { display: flex; flex-direction: column; gap: 8px; }

  .field-label {
    font-family: var(--mono);
    font-size: 10px;
    color: #8bbcd8;
    letter-spacing: 2px;
    text-transform: uppercase;
  }

  .field-select {
    background: var(--surface2);
    border: 1px solid var(--border);
    color: #dff0ff;
    font-family: var(--mono);
    font-size: 13px;
    padding: 10px 14px;
    border-radius: 3px;
    outline: none;
    transition: all 0.2s;
    width: 100%;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
  }

  .field-select:focus {
    border-color: var(--accent4);
    background: var(--surface3);
    box-shadow: 0 0 20px rgba(191,127,255,0.12);
  }

  .select-wrapper { position: relative; }

  .select-wrapper::after {
    content: '▾';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent4);
    font-size: 11px;
    pointer-events: none;
  }

  /* ── IO Section ── */
  .io-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
    align-items: stretch;
  }

  .io-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    position: relative;
    display: flex;
    flex-direction: column;
  }

  .io-panel.input-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,107,53,0.5), transparent);
  }

  .io-panel.output-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(191,127,255,0.5), transparent);
  }

  .io-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
  }

  .io-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: #c8e0f0;
  }

  .io-dot { width: 8px; height: 8px; border-radius: 50%; }
  .input-panel .io-dot  { background: var(--accent3); box-shadow: 0 0 8px var(--accent3); }
  .output-panel .io-dot { background: var(--accent4); box-shadow: 0 0 8px var(--accent4); }

  .io-actions { display: flex; gap: 6px; align-items: center; }

  .icon-btn {
    background: transparent;
    border: 1px solid var(--border2);
    color: #7aaccb;
    width: 28px; height: 28px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(0,212,255,0.05);
  }

  .upload-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 12px;
    height: 28px;
    background: rgba(255,107,53,0.1);
    border: 1px solid var(--accent3);
    border-radius: 3px;
    color: var(--accent3);
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }

  .upload-btn:hover {
    background: rgba(255,107,53,0.2);
    box-shadow: 0 0 14px rgba(255,107,53,0.25);
    transform: translateY(-1px);
  }

  .file-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(255,107,53,0.08);
    border: 1px solid rgba(255,107,53,0.25);
    border-radius: 2px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--accent3);
    max-width: 160px;
    overflow: hidden;
  }

  .file-badge-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .file-badge-clear {
    cursor: pointer;
    opacity: 0.6;
    flex-shrink: 0;
    font-size: 11px;
    line-height: 1;
  }

  .file-badge-clear:hover { opacity: 1; color: #ff5050; }

  .io-textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: #dff0ff;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.7;
    padding: 18px;
    resize: none;
    outline: none;
    min-height: 200px;
  }

  .io-textarea::placeholder { color: var(--text3); }

  .io-textarea:read-only { cursor: default; }

  .io-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 18px;
    border-top: 1px solid var(--border);
    background: rgba(0,0,0,0.2);
  }

  .io-stat {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    letter-spacing: 0.5px;
  }

  /* ── Hash Results ── */
  .results-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
  }

  .results-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent4), transparent);
    opacity: 0.5;
  }

  .results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
  }

  .results-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: #c8e0f0;
  }

  .results-title-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent4);
    box-shadow: 0 0 8px var(--accent4);
  }

  .copy-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(191,127,255,0.06);
    border: 1px solid var(--accent4);
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent4);
    cursor: pointer;
    padding: 5px 12px;
    letter-spacing: 1px;
    transition: all 0.2s;
  }

  .copy-all-btn:hover {
    background: rgba(191,127,255,0.14);
    box-shadow: 0 0 12px rgba(191,127,255,0.15);
  }

  .copy-all-btn.copied {
    border-color: var(--accent2);
    color: var(--accent2);
    background: rgba(0,255,157,0.08);
  }

  .hash-rows { padding: 6px 0; }

  .hash-row {
    display: grid;
    grid-template-columns: 140px 1fr auto;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    border-bottom: 1px solid rgba(37,53,69,0.5);
    transition: background 0.15s;
  }

  .hash-row:last-child { border-bottom: none; }
  .hash-row:hover { background: rgba(255,255,255,0.02); }

  .hash-type-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--accent4);
    letter-spacing: 0.5px;
    white-space: nowrap;
  }

  .hash-type-dot {
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--accent4);
    flex-shrink: 0;
  }

  .hash-value {
    font-family: var(--mono);
    font-size: 13px;
    color: #dff0ff;
    word-break: break-all;
    line-height: 1.5;
  }

  .hash-value.empty { color: var(--text3); font-style: italic; }

  .copy-hash-btn {
    background: transparent;
    border: 1px solid var(--border2);
    color: #7aaccb;
    width: 28px; height: 28px;
    border-radius: 3px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
  }

  .copy-hash-btn:hover {
    border-color: var(--accent4);
    color: var(--accent4);
    background: rgba(191,127,255,0.08);
  }

  .copy-hash-btn.copied {
    border-color: var(--accent2);
    color: var(--accent2);
    background: rgba(0,255,157,0.08);
  }

  /* ── Action Bar ── */
  .action-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, rgba(191,127,255,0.18), rgba(0,212,255,0.08));
    border: 1px solid var(--accent4);
    color: var(--accent4);
    font-family: var(--mono);
    font-size: 13px;
    font-weight: 700;
    padding: 12px 28px;
    border-radius: 3px;
    cursor: pointer;
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
  }

  .btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(191,127,255,0.1), transparent);
    opacity: 0;
    transition: opacity 0.2s;
  }

  .btn-primary:hover {
    border-color: var(--accent4);
    box-shadow: 0 0 20px rgba(191,127,255,0.2), 0 0 40px rgba(191,127,255,0.08);
    transform: translateY(-1px);
  }

  .btn-primary:hover::before { opacity: 1; }
  .btn-primary:active { transform: translateY(0); }

  .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--surface2);
    border: 1px solid var(--border2);
    color: var(--text2);
    font-family: var(--mono);
    font-size: 11px;
    padding: 12px 20px;
    border-radius: 3px;
    cursor: pointer;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all 0.2s;
  }

  .btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(0,212,255,0.06);
  }

  .auto-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(0,255,157,0.06);
    border: 1px solid rgba(0,255,157,0.2);
    border-radius: 2px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--accent2);
    letter-spacing: 1px;
    margin-left: auto;
  }

  .auto-badge-dot {
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--accent2);
    box-shadow: 0 0 6px var(--accent2);
    animation: pulse 2s ease-in-out infinite;
  }

  /* ── Status Bar ── */
  .status-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 18px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border);
    border-radius: 3px;
    margin-bottom: 24px;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text3);
    transition: all 0.3s;
  }

  .status-bar.success { border-color: rgba(0,255,157,0.3); color: var(--accent2); background: rgba(0,255,157,0.04); }
  .status-bar.error   { border-color: rgba(255,80,80,0.3);  color: #ff8080;       background: rgba(255,80,80,0.04); }

  .status-indicator {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--text3);
    flex-shrink: 0;
    transition: all 0.3s;
  }

  .status-bar.success .status-indicator { background: var(--accent2); box-shadow: 0 0 8px var(--accent2); }
  .status-bar.error   .status-indicator { background: #ff5050; box-shadow: 0 0 8px #ff5050; }

  /* ── Toast ── */
  .toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 18px;
    background: var(--surface3);
    border: 1px solid var(--border2);
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text);
    z-index: 1000;
    transform: translateY(60px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
  }

  .toast.show { transform: translateY(0); opacity: 1; }
  .toast.success { border-color: var(--accent2); color: var(--accent2); }
  .toast.error   { border-color: #ff5050; color: #ff8080; }

  /* ── Info Sections ── */
  .explain-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 16px;
    margin-top: 8px;
  }

  .explain-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 20px 22px;
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s;
  }

  .explain-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(191,127,255,0.3), transparent);
  }

  .explain-card:hover { border-color: var(--border2); }

  .explain-card-icon { font-size: 22px; margin-bottom: 10px; }

  .explain-card-title {
    font-size: 12px;
    font-weight: 700;
    color: #c8e0f0;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
  }

  .explain-card-text {
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1.8;
    color: #8ab5d0;
  }

  /* ── Info stats strip ── */
  .stats-strip {
    display: flex;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 24px;
  }

  .stat-cell {
    flex: 1;
    padding: 14px 18px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .stat-cell:last-child { border-right: none; }

  .stat-label {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    letter-spacing: 1.5px;
    text-transform: uppercase;
  }

  .stat-value {
    font-family: var(--mono);
    font-size: 18px;
    font-weight: 700;
    color: var(--accent4);
  }

  /* ── Drop zone ── */
  .drop-zone {
    position: absolute;
    inset: 0;
    border: 2px dashed var(--accent);
    border-radius: 4px;
    background: rgba(0,212,255,0.06);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
  }

  .drop-zone.active { opacity: 1; pointer-events: all; }

  .drop-zone-icon { font-size: 28px; color: var(--accent); filter: drop-shadow(0 0 8px var(--accent)); }
  .drop-zone-text { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 1px; }

  /* ── Batch results table ── */
  .batch-table-wrap {
    display: none;
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 24px;
    position: relative;
  }

  .batch-table-wrap::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.4), transparent);
  }

  .batch-table-wrap.visible { display: block; }

  .batch-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
  }

  .batch-title {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: #c8e0f0;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .batch-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--mono);
    font-size: 12px;
  }

  .batch-table th {
    padding: 10px 16px;
    background: var(--surface2);
    color: var(--text3);
    font-size: 10px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    text-align: left;
    border-bottom: 1px solid var(--border);
  }

  .batch-table td {
    padding: 10px 16px;
    border-bottom: 1px solid rgba(37,53,69,0.4);
    color: #dff0ff;
    word-break: break-all;
  }

  .batch-table tr:last-child td { border-bottom: none; }
  .batch-table tr:hover td { background: rgba(255,255,255,0.02); }

  .batch-table td:first-child { color: var(--text3); max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

  .export-csv-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(0,212,255,0.06);
    border: 1px solid var(--accent);
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent);
    cursor: pointer;
    padding: 5px 12px;
    letter-spacing: 1px;
    transition: all 0.2s;
  }

  .export-csv-btn:hover { background: rgba(0,212,255,0.14); }

  /* ── Add Batch Button ── */
  .add-batch-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 12px;
    height: 28px;
    background: rgba(0,255,157,0.08);
    border: 1px solid var(--accent2);
    border-radius: 3px;
    color: var(--accent2);
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
  }

  .add-batch-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,255,157,0.06);
    opacity: 0;
    transition: opacity 0.2s;
  }

  .add-batch-btn:hover:not(:disabled) {
    background: rgba(0,255,157,0.16);
    box-shadow: 0 0 14px rgba(0,255,157,0.2);
    transform: translateY(-1px);
  }

  .add-batch-btn:hover:not(:disabled)::before { opacity: 1; }
  .add-batch-btn:active:not(:disabled) { transform: translateY(0); }

  .add-batch-btn:disabled {
    opacity: 0.28;
    cursor: not-allowed;
    border-color: var(--border2);
    color: var(--text3);
    background: transparent;
    box-shadow: none;
    transform: none;
  }

  .add-batch-btn.hidden { display: none; }

  /* ── Label anchor links ── */
  .field-label-link {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: #8bbcd8;
    text-decoration: none;
    border-bottom: 1px dashed rgba(139,188,216,0.35);
    transition: color 0.15s, border-color 0.15s;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 5px;
  }

  .field-label-link::after {
    content: '↓';
    font-size: 9px;
    opacity: 0.5;
    transition: opacity 0.15s, transform 0.15s;
  }

  .field-label-link:hover {
    color: var(--accent4);
    border-color: rgba(191,127,255,0.5);
  }

  .field-label-link:hover::after {
    opacity: 1;
    transform: translateY(1px);
  }

  /* ── Explain sections ── */
  .explain-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 24px 28px;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
    scroll-margin-top: 24px;
    transition: border-color 0.3s, box-shadow 0.3s;
  }

  .explain-section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(191,127,255,0.25), transparent);
    transition: opacity 0.3s;
  }

  .explain-section:target {
    border-color: var(--accent4);
    box-shadow: 0 0 0 1px rgba(191,127,255,0.2), 0 0 32px rgba(191,127,255,0.08);
  }

  .explain-section:target::before {
    background: linear-gradient(90deg, transparent, var(--accent4), transparent);
    opacity: 0.7;
  }

  .explain-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
  }

  .explain-section-icon {
    width: 32px; height: 32px;
    border: 1px solid var(--border2);
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    flex-shrink: 0;
    background: var(--surface2);
  }

  .explain-section-title {
    font-size: 13px;
    font-weight: 700;
    color: #c8e0f0;
    letter-spacing: 1px;
  }

  .explain-section-id {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    margin-left: auto;
    letter-spacing: 1px;
  }

  .explain-rows {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .explain-row {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 16px;
    padding: 12px 14px;
    background: var(--surface2);
    border: 1px solid rgba(37,53,69,0.8);
    border-radius: 3px;
  }

  .explain-row-key {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--accent4);
    font-weight: 700;
    letter-spacing: 0.5px;
    display: flex;
    align-items: flex-start;
    padding-top: 1px;
  }

  .explain-row-val {
    font-family: var(--mono);
    font-size: 11px;
    color: #8ab5d0;
    line-height: 1.75;
  }

  .explain-row-val code {
    font-family: var(--mono);
    color: var(--accent2);
    background: rgba(0,255,157,0.07);
    padding: 1px 5px;
    border-radius: 2px;
    font-size: 11px;
  }

  @media (max-width: 768px) {
    .io-section { grid-template-columns: 1fr; }
    .config-grid { grid-template-columns: 1fr 1fr; }
    .explain-grid { grid-template-columns: 1fr; }
    .hash-row { grid-template-columns: 110px 1fr auto; }
    .stats-strip { flex-wrap: wrap; }
    .logo-title { font-size: 28px; }
    header { flex-direction: column; align-items: flex-start; gap: 20px; }
    .action-bar { flex-direction: column; align-items: stretch; }
    .btn-primary, .btn-secondary { justify-content: center; }
    .auto-badge { margin-left: 0; }
  }