/* ═══════════════════════════════════════════════════════════════
   Bit/Byte Viewer — Tool Styles
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bv-accent:       #6A1B9A;
  --bv-accent-light: #F3E5F5;
  --bv-bit-on:       #6A1B9A;
  --bv-bit-off:      #F1F5F9;
  --bv-bit-on-text:  #fff;
  --bv-bit-off-text: #94A3B8;
}

/* ── Card ────────────────────────────────────────────────────── */
.bv-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
}
.bv-card-header {
  background: #F8FAFC;
  border-bottom: 1px solid var(--card-border);
  padding: 11px 18px;
  font-size: 12px; font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.7px;
  display: flex; align-items: center;
}
.bv-card-body { padding: 18px; }
.bv-hint {
  font-size: 11px; font-weight: 400; text-transform: none;
  letter-spacing: 0; color: var(--text-muted); font-style: italic;
}

/* ── Mode / Sign buttons ─────────────────────────────────────── */
.bv-mode-row { display: flex; gap: 8px; }
.bv-mode-btn, .bv-sign-btn {
  flex: 1; padding: 9px 12px;
  border: 1px solid var(--card-border);
  border-radius: 8px; font-size: 13px; font-weight: 600;
  background: #F8FAFC; color: var(--text-secondary);
  cursor: pointer; font-family: inherit;
  transition: all 0.14s;
}
.bv-mode-btn:hover, .bv-sign-btn:hover {
  border-color: var(--bv-accent); color: var(--bv-accent);
  background: var(--bv-accent-light);
}
.bv-mode-btn.active, .bv-sign-btn.active {
  background: var(--bv-accent); color: #fff;
  border-color: var(--bv-accent);
}

/* ── Form fields ─────────────────────────────────────────────── */
.bv-field { margin-bottom: 14px; }
.bv-field:last-child { margin-bottom: 0; }
.bv-label {
  display: block; font-size: 11px; font-weight: 700;
  color: var(--text-secondary); margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.bv-input {
  width: 100%; padding: 9px 12px;
  border: 1px solid var(--card-border); border-radius: 8px;
  font-size: 14px; color: var(--text-primary);
  background: #FAFBFC; outline: none; font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.bv-input:focus {
  border-color: var(--bv-accent);
  box-shadow: 0 0 0 3px rgba(106,27,154,0.12);
  background: #fff;
}
.bv-input-large { font-size: 22px; font-weight: 700; text-align: center; }
.bv-input-mono  { font-family: 'Consolas', 'Courier New', monospace; font-size: 15px; font-weight: 600; letter-spacing: 1px; }
.bv-input-bin   { font-size: 13px; letter-spacing: 2px; }

.bv-hex-row { display: flex; align-items: center; gap: 0; }
.bv-prefix  {
  padding: 9px 10px; background: #F1F5F9;
  border: 1px solid var(--card-border); border-right: none;
  border-radius: 8px 0 0 8px;
  font-family: 'Consolas','Courier New',monospace;
  font-size: 15px; font-weight: 700; color: var(--text-muted);
}
.bv-hex-row .bv-input {
  border-radius: 0 8px 8px 0; text-transform: uppercase;
}

/* ── Result card ─────────────────────────────────────────────── */
.bv-result-card {
  background: linear-gradient(135deg, #6A1B9A 0%, #8E24AA 100%);
  border-radius: var(--card-radius); padding: 20px 24px; color: #fff;
  box-shadow: 0 4px 16px rgba(106,27,154,0.28);
}
.bv-result-row {
  display: flex; align-items: center; gap: 0; flex-wrap: wrap;
}
.bv-result-sep {
  width: 1px; height: 40px; background: rgba(255,255,255,0.25);
  margin: 0 20px;
}
.bv-result-label {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.8px; opacity: 0.7; margin-bottom: 4px;
}
.bv-result-value {
  font-size: 1.4rem; font-weight: 800; line-height: 1;
}
.bv-mono { font-family: 'Consolas','Courier New',monospace; }

/* ── Bit grid ────────────────────────────────────────────────── */
.bv-bit-grid {
  display: flex; flex-direction: column; gap: 10px;
}
.bv-bit-row {
  display: flex; gap: 5px; justify-content: center; flex-wrap: nowrap;
}
.bv-bit-group {
  display: flex; gap: 5px;
}
.bv-bit-group + .bv-bit-group { margin-left: 10px; }

.bv-bit {
  display: flex; flex-direction: column; align-items: center;
  width: 44px; border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer; user-select: none;
  transition: all 0.12s; font-family: inherit;
  padding: 0;
}
.bv-bit-num {
  font-size: 9px; font-weight: 600; letter-spacing: 0.2px;
  padding: 3px 0 2px; width: 100%; text-align: center;
  border-radius: 6px 6px 0 0;
  background: rgba(0,0,0,0.06);
}
.bv-bit-val {
  font-size: 18px; font-weight: 800;
  padding: 6px 0 5px; width: 100%; text-align: center;
  border-radius: 0 0 6px 6px;
}

.bv-bit.off {
  background: var(--bv-bit-off);
  border-color: #E2E8F0;
}
.bv-bit.off .bv-bit-num { color: #94A3B8; background: rgba(0,0,0,0.04); }
.bv-bit.off .bv-bit-val { color: #CBD5E1; }

.bv-bit.on {
  background: var(--bv-bit-on);
  border-color: var(--bv-bit-on);
  box-shadow: 0 2px 8px rgba(106,27,154,0.3);
}
.bv-bit.on .bv-bit-num { color: rgba(255,255,255,0.7); background: rgba(0,0,0,0.12); }
.bv-bit.on .bv-bit-val { color: #fff; }

.bv-bit:hover.off { border-color: var(--bv-accent); background: var(--bv-accent-light); }
.bv-bit:hover.on  { opacity: 0.85; }

/* Byte separator label */
.bv-byte-label {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px; color: var(--text-muted);
  text-align: center; margin-top: 4px;
}

/* ── Byte overview ───────────────────────────────────────────── */
.bv-byte-grid { display: flex; gap: 10px; flex-wrap: wrap; }
.bv-byte-card {
  flex: 1; min-width: 100px;
  background: #F8FAFC; border: 1px solid var(--card-border);
  border-radius: 10px; padding: 12px 14px; text-align: center;
}
.bv-byte-title {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.6px; color: var(--text-muted); margin-bottom: 6px;
}
.bv-byte-hex {
  font-family: 'Consolas','Courier New',monospace;
  font-size: 18px; font-weight: 800; color: var(--bv-accent);
}
.bv-byte-dec {
  font-size: 12px; color: var(--text-secondary); margin-top: 2px;
}
.bv-byte-bin {
  font-family: 'Consolas','Courier New',monospace;
  font-size: 11px; color: var(--text-muted); margin-top: 2px; letter-spacing: 1px;
}

/* ── Quick buttons ───────────────────────────────────────────── */
.bv-quick-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.bv-quick-btn {
  padding: 6px 12px; border-radius: 8px;
  border: 1px solid var(--card-border);
  background: #F8FAFC; font-size: 12px; font-weight: 600;
  font-family: 'Consolas','Courier New',monospace;
  color: var(--text-secondary); cursor: pointer;
  transition: all 0.12s;
}
.bv-quick-btn:hover {
  border-color: var(--bv-accent); color: var(--bv-accent);
  background: var(--bv-accent-light);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 700px) {
  .bv-bit { width: 36px; }
  .bv-bit-val { font-size: 15px; }
  .bv-bit-num { font-size: 8px; }
  .bv-bit-group + .bv-bit-group { margin-left: 6px; }
}