/* ===== Base64 Encoder/Decoder - Modern Styles ===== */

/* Layout */
.b64-layout { display: grid; grid-template-columns: 1fr 320px; gap: 28px; align-items: start; }
.b64-main { min-width: 0; }
.b64-card {
  background: var(--bg-card); border: 1px solid var(--border-light); border-radius: 18px;
  padding: 32px; box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}
.b64-sidebar { display: flex; flex-direction: column; gap: 20px; }

/* Settings bar */
.b64-settings { margin-bottom: 20px; background: var(--bg-soft); border-radius: 14px; padding: 16px 20px; border: 1px solid var(--border-light); }
.b64-mode-row { display: flex; gap: 10px; margin-bottom: 14px; }
.b64-mode-btn {
  padding: 10px 22px; border: 2px solid var(--border-light); border-radius: 10px;
  font-size: 14px; font-weight: 600; cursor: pointer; background: var(--bg);
  color: var(--text-secondary); transition: all 0.2s; font-family: inherit;
  display: inline-flex; align-items: center; gap: 8px;
}
.b64-mode-btn:hover { border-color: var(--primary); color: var(--primary); }
.b64-mode-btn.active { background: linear-gradient(135deg, var(--primary), #8b5cf6); color: #fff; border-color: transparent; box-shadow: 0 3px 10px rgba(79,70,229,0.25); }
.b64-mode-btn i { font-size: 13px; }
.b64-options-row { display: flex; gap: 16px; align-items: end; flex-wrap: wrap; }
.b64-opt-group { display: flex; flex-direction: column; gap: 6px; }
.b64-opt-label { font-size: 12px; font-weight: 600; color: var(--text-secondary); }
.b64-select {
  padding: 8px 12px; border: 2px solid var(--border-light); border-radius: 10px;
  font-size: 13px; background: var(--bg); color: var(--text); outline: none;
  cursor: pointer; transition: all 0.2s; font-family: inherit;
}
.b64-select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.b64-file-btn {
  padding: 8px 16px; border: 2px dashed var(--primary); border-radius: 10px;
  font-size: 13px; font-weight: 600; cursor: pointer; background: var(--primary-50);
  color: var(--primary); transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px;
  font-family: inherit;
}
.b64-file-btn:hover { background: var(--primary); color: #fff; }

/* Section */
.b64-section { margin-bottom: 16px; }
.b64-section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px; font-size: 13px; font-weight: 700; color: var(--text-secondary);
}
.b64-section-actions { display: flex; gap: 6px; }
.b64-action-btn {
  width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--border-light);
  background: var(--bg); color: var(--text-muted); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.2s; font-size: 12px;
}
.b64-action-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Textareas */
.b64-textarea {
  width: 100%; min-height: 140px; padding: 14px 16px;
  border: 2px solid var(--border-light); border-radius: 12px;
  font-size: 14px; font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  background: var(--bg); color: var(--text); outline: none;
  resize: vertical; transition: border-color 0.2s; line-height: 1.6;
  box-sizing: border-box;
}
.b64-textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.b64-textarea[readonly] { background: var(--bg-soft); cursor: default; }
.b64-textarea[readonly]:focus { border-color: var(--border-light); box-shadow: none; }
body[data-theme="dark"] .b64-textarea { background: var(--bg-muted); border-color: var(--border); }
body[data-theme="dark"] .b64-textarea[readonly] { background: var(--bg-muted); }

/* Info bars */
.b64-input-info, .b64-output-info {
  margin-top: 6px; font-size: 12px; color: var(--text-muted);
  display: flex; gap: 16px;
}

/* Auto-toggle */
.b64-auto-row { margin-top: 8px; display: flex; align-items: center; }
.b64-toggle-label { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; font-size: 13px; color: var(--text-secondary); font-weight: 500; user-select: none; }
.b64-toggle-switch {
  width: 36px; height: 20px; background: var(--border); border-radius: 12px;
  position: relative; transition: background 0.2s; flex-shrink: 0;
}
.b64-toggle-switch::after {
  content: ''; width: 16px; height: 16px; background: #fff; border-radius: 50%;
  position: absolute; top: 2px; left: 2px; transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
.b64-toggle-label input:checked + .b64-toggle-switch { background: var(--primary); }
.b64-toggle-label input:checked + .b64-toggle-switch::after { transform: translateX(16px); }
.b64-toggle-label input { display: none; }

/* Error */
.b64-error { margin-top: 12px; padding: 12px 16px; background: #fef2f2; border: 1px solid #fecaca; border-radius: 12px; color: #dc2626; font-size: 13px; font-weight: 500; display: none; }
body[data-theme="dark"] .b64-error { background: rgba(239,68,68,0.1); border-color: rgba(239,68,68,0.3); color: #fca5a5; }

/* How-to list */
.b64-howto-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.b64-howto-list li { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-secondary); line-height: 1.4; }
.b64-howto-num {
  width: 24px; height: 24px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}

/* Sidebar (shared patterns) */
.sidebar-section { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: 16px; padding: 20px; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04); }
.sidebar-header { text-align: center; padding: 28px 20px !important; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important; border-color: transparent !important; }
.sidebar-header h1 { font-size: 1.35rem; font-weight: 800; color: #fff; margin-bottom: 6px; text-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.sidebar-header p { font-size: 0.82rem; color: rgba(255,255,255,0.85); }
body[data-theme="dark"] .sidebar-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important; }
.sidebar-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.sidebar-title i { color: var(--primary); font-size: 0.9rem; }
.sidebar-tools { display: flex; flex-direction: column; gap: 8px; }
.sidebar-tool { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px; transition: all 0.2s ease; text-decoration: none; background: var(--bg-soft); }
.sidebar-tool:hover { background: var(--primary-50); transform: translateX(3px); }
.sidebar-tool-icon { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: 10px; font-size: 16px; flex-shrink: 0; background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; }
.sidebar-tool-info { flex: 1; min-width: 0; }
.sidebar-tool-name { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.sidebar-tool-desc { font-size: 0.78rem; color: var(--text-muted); }
.ad-placeholder { width: 300px; height: 250px; flex-shrink: 0; margin: 0 auto; background: var(--bg-card); border: 2px dashed var(--border); border-radius: 16px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 20px; color: var(--text-muted); font-size: 0.82rem; line-height: 1.5; }
.ad-placeholder .ad-icon { font-size: 1.8rem; color: var(--text-muted); margin-bottom: 10px; opacity: 0.4; }
.ad-placeholder .ad-label { font-weight: 600; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 4px; }
.ad-placeholder .ad-size { font-size: 0.75rem; color: var(--text-muted); opacity: 0.6; }

/* Dark mode */
body[data-theme="dark"] .b64-card { background: var(--bg-card); border-color: var(--border); }
body[data-theme="dark"] .sidebar-section { background: var(--bg-card); border-color: var(--border); }
body[data-theme="dark"] .sidebar-tool { background: var(--bg-muted); }
body[data-theme="dark"] .sidebar-tool:hover { background: var(--primary-50); }
body[data-theme="dark"] .ad-placeholder { background: var(--bg-card); border-color: var(--border); }
body[data-theme="dark"] .b64-settings { background: var(--bg-muted); border-color: var(--border); }
body[data-theme="dark"] .b64-select { background: var(--bg-muted); border-color: var(--border); }
body[data-theme="dark"] .b64-mode-btn { background: var(--bg-muted); }
body[data-theme="dark"] .b64-mode-btn:hover { background: var(--primary-50); }
body[data-theme="dark"] .b64-action-btn { background: var(--bg-muted); border-color: var(--border); }
body[data-theme="dark"] .b64-action-btn:hover { background: var(--primary); border-color: var(--primary); }
body[data-theme="dark"] .b64-file-btn { background: rgba(79,70,229,0.15); }

/* ===== calc-bottom Styles ===== */
.calc-bottom {
  padding: 12px 0 56px;
}

.calc-bottom-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
  margin-bottom: 18px;
}

.calc-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
  padding: 20px;
}

.calc-panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.calc-panel-title i {
  color: var(--primary);
}

.calc-panel-lead {
  margin: 0 0 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

.calc-feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.calc-feature-card {
  border-radius: 14px;
  padding: 14px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(99, 102, 241, 0.03));
  border: 1px solid rgba(99, 102, 241, 0.12);
}

.calc-feature-card.accent-green {
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.03));
  border-color: rgba(16, 185, 129, 0.14);
}

.calc-feature-card.accent-blue {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03));
  border-color: rgba(59, 130, 246, 0.14);
}

.calc-feature-card.accent-orange {
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03));
  border-color: rgba(245, 158, 11, 0.14);
}

.calc-feature-card.accent-violet {
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.03));
  border-color: rgba(168, 85, 247, 0.14);
}

.calc-feature-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
}

.accent-green .calc-feature-icon { background: linear-gradient(135deg, #10b981, #059669); }
.accent-blue .calc-feature-icon { background: linear-gradient(135deg, #3b82f6, #2563eb); }
.accent-orange .calc-feature-icon { background: linear-gradient(135deg, #f59e0b, #d97706); }
.accent-violet .calc-feature-icon { background: linear-gradient(135deg, #a855f7, #7c3aed); }

.calc-feature-name {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-feature-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.calc-feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.calc-feature-list i {
  color: #10b981;
  margin-right: 6px;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.shortcut-table thead th {
  text-align: left;
  padding: 10px 0;
  color: var(--text-muted);
  font-weight: 700;
  border-bottom: 1px solid var(--border-light);
}

.shortcut-table tbody td {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
}

.shortcut-table tbody td:first-child {
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  color: var(--primary);
  font-weight: 700;
}

.calc-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.calc-step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(99, 102, 241, 0.03));
}

.calc-step-num {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}

.calc-step-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-step-desc {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.calc-use-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.calc-use-card {
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--border-light);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.06), rgba(255, 255, 255, 0.04));
}

.calc-use-card.warm { background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03)); }
.calc-use-card.cool { background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.03)); }
.calc-use-card.green { background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.03)); }
.calc-use-card.amber { background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03)); }

.calc-use-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
}

.warm .calc-use-icon { background: linear-gradient(135deg, #f59e0b, #d97706); }
.cool .calc-use-icon { background: linear-gradient(135deg, #a855f7, #7c3aed); }
.green .calc-use-icon { background: linear-gradient(135deg, #10b981, #059669); }
.amber .calc-use-icon { background: linear-gradient(135deg, #3b82f6, #2563eb); }

.calc-use-title {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-use-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.calc-knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.calc-knowledge-card {
  border-radius: 14px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(99, 102, 241, 0.08);
}

.calc-knowledge-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}

.calc-knowledge-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 13px;
}

.calc-cta {
  margin-top: 14px;
  border-radius: 16px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.10), rgba(168, 85, 247, 0.10));
  border: 1px solid rgba(99, 102, 241, 0.16);
}

.calc-cta-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-cta-title i {
  color: #8b5cf6;
  margin-right: 8px;
}

.calc-cta-text {
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 13px;
}

body[data-theme="dark"] .calc-cta,
body[data-theme="dark"] .calc-feature-card,
body[data-theme="dark"] .calc-use-card,
body[data-theme="dark"] .calc-knowledge-card {
  border-color: var(--border);
}

/* ===== calc-bottom Responsive ===== */
@media (max-width: 860px) {
  .calc-bottom-grid {
    grid-template-columns: 1fr;
  }
  .calc-feature-grid, .calc-steps, .calc-use-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .calc-knowledge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .calc-feature-grid, .calc-steps, .calc-use-grid, .calc-knowledge-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== base64 Responsive ===== */
@media (max-width: 1024px) { .b64-layout { grid-template-columns: 1fr 280px; gap: 20px; } }
@media (max-width: 860px) { .b64-layout { grid-template-columns: 1fr; } .b64-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; } }
@media (max-width: 768px) {
  .b64-card { padding: 20px; }
  .b64-options-row { flex-direction: column; }
  .b64-textarea { min-height: 100px; }
}
@media (max-width: 640px) { .b64-sidebar { grid-template-columns: 1fr; } }