/* STUDIOS-PRO DevPlayground & Converter Design System */
:root {
  --bg-body: #07090e;
  --bg-panel: rgba(15, 23, 42, 0.65);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.35);
  --accent-violet: #8b5cf6;
  --accent-violet-glow: rgba(139, 92, 246, 0.35);
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  
  --font-sans: 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-body);
  background-image: 
    radial-gradient(at 0% 0%, rgba(139, 92, 246, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.1) 0px, transparent 50%);
  color: var(--text-main);
  font-family: var(--font-sans);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Header Styling */
header {
  height: 64px;
  min-height: 64px;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 8px var(--accent-cyan-glow));
  animation: logo-spin 4s infinite linear;
}

@keyframes logo-spin {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(180deg) scale(1.1); }
  100% { transform: rotate(360deg); }
}

.header-logo h1 {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.app-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid rgba(6, 182, 212, 0.2);
  margin-left: 8px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot.online {
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.lang-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.25);
}

/* App Main Container Layout */
.app-container {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border-color);
  height: calc(100vh - 64px);
  overflow: hidden;
}

/* Left & Right Panels Common */
.panel-left, .panel-right {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-body);
  height: 100%;
  overflow: hidden;
}

/* LEFT PANEL (Tools & Editors) */
.tool-tabs {
  display: flex;
  flex-wrap: wrap;
  background: rgba(15, 23, 42, 0.4);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 12px;
  gap: 6px;
}

.tab-btn {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
}

.tab-btn.active {
  color: var(--accent-cyan);
  border-color: rgba(6, 182, 212, 0.4);
  background: rgba(6, 182, 212, 0.08);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.1);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.tab-content {
  display: none;
  height: 100%;
  flex-direction: column;
}

.tab-content.active {
  display: flex;
}

/* Editors Subtabs */
.editor-subtabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.subtab-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.subtab-btn:hover {
  color: var(--text-main);
  background: rgba(255,255,255,0.06);
}

.subtab-btn.active {
  background: rgba(6, 182, 212, 0.1);
  border-color: rgba(6, 182, 212, 0.3);
  color: var(--text-main);
}

.editor-wrapper {
  flex: 1;
  min-height: 350px;
  position: relative;
}

/* Textareas code inputs */
.code-textarea {
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 16px;
  resize: none;
  outline: none;
  line-height: 1.5;
  transition: var(--transition-smooth);
}

.code-textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.15);
  background: rgba(15, 23, 42, 0.85);
}

.code-textarea.hidden {
  display: none;
}

.code-textarea.small-height {
  height: 100px;
  min-height: 100px;
}

.code-textarea.full-height {
  height: 100%;
}

/* UI Panel Section & Groups */
.tool-section h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.tool-divider {
  height: 1px;
  background: var(--border-color);
  margin: 24px 0;
}

.btn-group {
  display: flex;
  gap: 12px;
  margin-top: 14px;
}

.btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

/* Buttons System */
.btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.8rem;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
}

.btn-secondary {
  border-color: rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan);
}

.btn-secondary:hover {
  background: rgba(6, 182, 212, 0.08);
  border-color: var(--accent-cyan);
}

.btn-accent {
  background: rgba(244, 63, 94, 0.1);
  border-color: rgba(244, 63, 94, 0.3);
  color: var(--accent-rose);
}

.btn-accent:hover {
  background: var(--accent-rose);
  color: white;
  border-color: var(--accent-rose);
  box-shadow: 0 4px 15px rgba(244, 63, 94, 0.3);
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 8px;
  border-radius: 6px;
  transition: var(--transition-smooth);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

/* File Drag & Drop Zone */
.drop-zone {
  background: rgba(15, 23, 42, 0.4);
  border: 2px dashed rgba(6, 182, 212, 0.2);
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.04);
  box-shadow: inset 0 0 15px rgba(6, 182, 212, 0.05);
}

.drop-icon {
  font-size: 2.2rem;
  color: var(--accent-cyan);
  opacity: 0.7;
  transition: var(--transition-smooth);
}

.drop-zone:hover .drop-icon {
  transform: translateY(-4px) scale(1.05);
  opacity: 1;
}

.drop-zone p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  max-width: 250px;
}

/* RIGHT PANEL (Output / Preview Screen) */
.panel-header {
  height: 52px;
  background: rgba(15, 23, 42, 0.4);
  border-bottom: 1px solid var(--border-color);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-header h2 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-output-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.output-container {
  display: none;
  height: 100%;
  flex-direction: column;
}

.output-container.active {
  display: flex;
}

/* Dev Playground Previews */
#container-playground {
  gap: 16px;
}

#preview-frame {
  flex: 1.3;
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: white;
  min-height: 250px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.25);
}

.virtual-console {
  flex: 0.7;
  background: #090d16;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  min-height: 130px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.3);
}

.console-header {
  height: 34px;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border-color);
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
}

.btn-clear-logs {
  background: transparent;
  border: none;
  color: var(--accent-rose);
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  font-size: 0.7rem;
}
.btn-clear-logs:hover {
  text-decoration: underline;
}

.console-logs {
  flex: 1;
  padding: 12px 16px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
  line-height: 1.4;
}

.console-log-line {
  border-bottom: 1px solid rgba(255,255,255,0.02);
  padding-bottom: 4px;
}

.log-info { color: #f8fafc; }
.log-log { color: #38bdf8; }
.log-error { color: #f43f5e; font-weight: 600; }
.log-warn { color: #fbbf24; }

/* Base64 Preview Box */
.base64-file-details {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
}

.detail-label {
  color: var(--text-muted);
  font-weight: 600;
}

.detail-val {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

#container-base64 h3 {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.media-preview-box {
  width: 100%;
  height: 200px;
  min-height: 200px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
  position: relative;
}

.preview-placeholder {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
}

.media-preview-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.media-preview-box audio {
  width: 80%;
  accent-color: var(--accent-cyan);
}

.media-preview-box video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.media-preview-box iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
}

/* Embed codes box */
.embed-box {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.embed-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* Quick Toast popup */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--accent-cyan);
  color: white;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 10000;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  align-items: center;
  gap: 8px;
}

#toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Monospace text selection styling */
::selection {
  background: rgba(6, 182, 212, 0.3);
  color: white;
}

/* Monospace Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.18);
}

/* ===========================
   SHARED COMPONENT UTILITIES
   =========================== */
.tool-desc {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
  background: rgba(255,255,255,0.02);
  border-left: 2px solid var(--accent-cyan);
  padding: 8px 12px;
  border-radius: 0 6px 6px 0;
}

.code-input-field {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 8px 12px;
  outline: none;
  transition: var(--transition-smooth);
  width: 100%;
}
.code-input-field:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(6,182,212,0.12);
}

/* ===========================
   HASH GENERATOR
   =========================== */
.hash-results {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.hash-row {
  display: grid;
  grid-template-columns: 75px 1fr 32px;
  align-items: center;
  gap: 10px;
  background: rgba(15,23,42,0.5);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  transition: var(--transition-smooth);
}

.hash-row:hover {
  border-color: rgba(6,182,212,0.3);
  background: rgba(6,182,212,0.03);
}

.hash-algo {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
  white-space: nowrap;
}

.hash-val {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.hash-val.filled {
  color: #a5f3fc;
}

.btn-copy-hash {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.78rem;
  padding: 4px;
  border-radius: 4px;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-copy-hash:hover {
  color: var(--accent-cyan);
  background: rgba(6,182,212,0.1);
}

/* ===========================
   COLOR CONVERTER
   =========================== */
.color-picker-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.color-swatch {
  width: 52px;
  height: 44px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  padding: 0;
  background: none;
  outline: none;
  flex-shrink: 0;
}

.color-preview-block {
  height: 80px;
  border-radius: 12px;
  margin-bottom: 14px;
  border: 1px solid var(--border-color);
  transition: background 0.2s ease;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.3);
}

.color-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}

.color-field-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.color-field-group label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.color-field-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.palette-swatches {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.palette-swatch {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  position: relative;
  transition: transform 0.15s ease;
  flex-shrink: 0;
}
.palette-swatch:hover {
  transform: scale(1.12);
  z-index: 1;
}
.palette-swatch::after {
  content: attr(data-hex);
  position: absolute;
  bottom: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s;
}
.palette-swatch:hover::after {
  opacity: 1;
}

/* ===========================
   REGEX TESTER
   =========================== */
.regex-pattern-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
  background: rgba(15,23,42,0.6);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 12px;
}

.regex-delimiter {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-violet);
  font-weight: 700;
  flex-shrink: 0;
}

.regex-flags {
  width: 52px !important;
  flex: none !important;
  background: transparent !important;
  border: none !important;
  padding: 4px 6px !important;
  color: var(--accent-emerald) !important;
  font-size: 0.85rem !important;
}

.regex-info-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  min-height: 24px;
}

.regex-badge {
  background: rgba(6,182,212,0.12);
  border: 1px solid rgba(6,182,212,0.25);
  color: var(--accent-cyan);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
}

.regex-error {
  font-size: 0.72rem;
  color: var(--accent-rose);
  font-family: var(--font-mono);
}

.regex-highlighted-box {
  background: rgba(15,23,42,0.7);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #cbd5e1;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 80px;
  margin-top: 10px;
}

.regex-match {
  background: rgba(6,182,212,0.22);
  border-bottom: 2px solid var(--accent-cyan);
  border-radius: 2px;
  color: #f0fdff;
  padding: 0 1px;
}

/* ===========================
   JWT DECODER
   =========================== */
.jwt-segments {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.jwt-part {
  border-radius: 10px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.jwt-part-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.jwt-header { border-left: 3px solid #f59e0b; }
.jwt-header .jwt-part-label { background: rgba(245,158,11,0.05); }

.jwt-payload { border-left: 3px solid var(--accent-cyan); }
.jwt-payload .jwt-part-label { background: rgba(6,182,212,0.05); }

.jwt-sig { border-left: 3px solid var(--accent-violet); }
.jwt-sig .jwt-part-label { background: rgba(139,92,246,0.05); }

.jwt-pre {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: #e2e8f0;
  padding: 12px 14px;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-all;
  background: rgba(9,13,22,0.5);
  line-height: 1.5;
}

/* ===========================
   TEXT DIFF VIEWER
   =========================== */
.diff-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  min-height: 260px;
}

.diff-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.diff-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

#container-diff {
  flex-direction: column;
}

.diff-output-box {
  flex: 1;
  background: rgba(9,13,22,0.7);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.diff-line {
  padding: 1px 8px;
  border-radius: 3px;
  white-space: pre-wrap;
  word-break: break-word;
}
.diff-line.added {
  background: rgba(16,185,129,0.15);
  color: #6ee7b7;
  border-left: 3px solid #10b981;
}
.diff-line.removed {
  background: rgba(244,63,94,0.12);
  color: #fda4af;
  border-left: 3px solid #f43f5e;
  text-decoration: line-through;
  text-decoration-color: rgba(244,63,94,0.5);
}
.diff-line.unchanged {
  color: #64748b;
  border-left: 3px solid transparent;
}
.diff-stat {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.02);
  border-radius: 6px;
  display: flex;
  gap: 16px;
}
.diff-stat .added-count { color: var(--accent-emerald); font-weight: 700; }
.diff-stat .removed-count { color: var(--accent-rose); font-weight: 700; }

/* Diff line columns polish */
.diff-num {
  display: inline-block;
  width: 18px;
  margin-right: 8px;
  color: var(--text-muted);
  text-align: center;
  font-weight: 700;
  user-select: none;
}

.diff-content {
  white-space: pre-wrap;
}

/* Hidden utility classes */
.hidden {
  display: none !important;
}

.util-subcontent.hidden {
  display: none !important;
}

/* Slider styling */
.slider-group input[type="range"] {
  accent-color: var(--accent-cyan);
  margin-top: 4px;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  -webkit-appearance: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.slider-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* UUID and Password Layouts */
.util-section-box {
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  margin-top: 8px;
}

/* Gradient Builder Stop Rows */
.gradient-stop-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}
.gradient-stop-color {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: none;
}
.gradient-stop-pos {
  flex: 1;
  cursor: pointer;
}
.gradient-stop-pos-text {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  min-width: 32px;
  text-align: right;
}
.btn-stop-delete {
  background: none;
  border: none;
  color: var(--accent-rose);
  cursor: pointer;
  padding: 4px;
  font-size: 0.85rem;
  transition: var(--transition-smooth);
}
.btn-stop-delete:hover {
  opacity: 0.8;
  transform: scale(1.1);
}

/* Gradient presets */
.gradient-preset-btn {
  height: 36px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.gradient-preset-btn:hover {
  transform: scale(1.05);
  border-color: rgba(255, 255, 255, 0.3);
}

/* Snippets list items */
.snippet-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 12px;
  transition: var(--transition-smooth);
  cursor: pointer;
}
.snippet-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
}
.snippet-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.snippet-item-title {
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-main);
}
.snippet-item-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.68rem;
  color: var(--text-muted);
}
.snippet-badge {
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.62rem;
  text-transform: uppercase;
}
.snippet-badge.general { background: rgba(148, 163, 184, 0.15); color: #94a3b8; }
.snippet-badge.html { background: rgba(244, 63, 94, 0.15); color: #f43f5e; }
.snippet-badge.css { background: rgba(6, 182, 212, 0.15); color: #06b6d4; }
.snippet-badge.javascript { background: rgba(234, 179, 8, 0.15); color: #eab308; }
.snippet-badge.sql { background: rgba(16, 185, 129, 0.15); color: #10b981; }
.snippet-badge.json { background: rgba(139, 92, 246, 0.15); color: #8b5cf6; }

.snippet-actions {
  display: flex;
  gap: 6px;
}
.btn-snippet-copy, .btn-snippet-delete {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  font-size: 0.78rem;
  transition: var(--transition-smooth);
}
.btn-snippet-copy { color: var(--text-muted); }
.btn-snippet-copy:hover { color: var(--accent-cyan); }
.btn-snippet-delete { color: var(--accent-rose); }
.btn-snippet-delete:hover { color: #ff0000; transform: scale(1.1); }

/* =============================================================
   MOBILE RESPONSIVENESS (Media Query)
   ============================================================= */
@media (max-width: 900px) {
  .app-container {
    grid-template-columns: 1fr;
    height: auto;
    overflow-y: auto;
  }
  
  body {
    overflow-y: auto;
    height: auto;
  }
  
  .panel-left, .panel-right {
    height: auto;
    overflow: visible;
  }
  
  .editor-wrapper {
    min-height: 300px;
  }
  
  #preview-frame {
    height: 400px;
  }
  
  .diff-inputs {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  
  .diff-col {
    min-height: 200px;
  }
}