/* ── QR Code Generator ── OVRNET Neon Theme ── */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Dark theme (default) */
  --bg-body-from:    #0f0f1a;
  --bg-body-to:      #1a1a2f;
  --bg-glass:        rgba(255, 255, 255, 0.03);
  --bg-glass-hover:  rgba(255, 255, 255, 0.06);
  --bg-input:        rgba(255, 255, 255, 0.05);
  --bg-input-focus:  rgba(255, 255, 255, 0.08);

  --text-primary:    #ffffff;
  --text-secondary:  rgba(255, 255, 255, 0.85);
  --text-muted:      rgba(255, 255, 255, 0.5);
  --text-dim:        rgba(255, 255, 255, 0.3);

  /* Accent colors */
  --accent-cyan:     #00ffff;
  --accent-magenta:  #ff00ff;
  --accent-green:    #00ff88;
  --accent-gradient: linear-gradient(45deg, #00ffff, #ff00ff);
  --accent-glow-c:   rgba(0, 255, 255, 0.4);
  --accent-glow-m:   rgba(255, 0, 255, 0.4);

  /* Syntax Colors (code-editor parts) */
  --syn-keyword:   #81d4fa;
  --syn-string:    #a5d6a7;
  --syn-function:  #00ffff;
  --syn-variable:  rgba(255, 255, 255, 0.85);
  --syn-number:    #ce93d8;
  --syn-comment:   rgba(255, 255, 255, 0.3);
  --syn-operator:  #ffcc80;
  --syn-type:      #80cbc4;

  /* UI */
  --border:        rgba(255, 255, 255, 0.08);
  --border-focus:  rgba(0, 255, 255, 0.5);
  --shadow:        0 8px 32px rgba(0, 0, 0, 0.5);
  --radius:        12px;
  --radius-sm:     8px;
  --radius-pill:   50px;
  --line-height:   1.7;

  /* Gutter */
  --gutter-bg:     rgba(0, 0, 0, 0.2);
  --gutter-text:   rgba(255, 255, 255, 0.15);
  --gutter-width:  3.2rem;

  /* Transition */
  --transition:    0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Gradient blob */
  --blob-opacity: 0.7;
}

[data-theme="light"] {
  --bg-body-from:    #e8ecf4;
  --bg-body-to:      #dde3f0;
  --bg-glass:        rgba(255, 255, 255, 0.65);
  --bg-glass-hover:  rgba(255, 255, 255, 0.8);
  --bg-input:        rgba(0, 0, 0, 0.04);
  --bg-input-focus:  rgba(0, 0, 0, 0.07);

  --text-primary:    #1a1a2f;
  --text-secondary:  #2c2c4a;
  --text-muted:      rgba(26, 26, 47, 0.5);
  --text-dim:        rgba(26, 26, 47, 0.25);

  --accent-cyan:     #0099aa;
  --accent-magenta:  #aa0099;
  --accent-green:    #009955;
  --accent-gradient: linear-gradient(45deg, #0099aa, #aa0099);
  --accent-glow-c:   rgba(0, 153, 170, 0.25);
  --accent-glow-m:   rgba(170, 0, 153, 0.25);

  --syn-keyword:   #4a90b8;
  --syn-string:    #5a8a5c;
  --syn-function:  #0099aa;
  --syn-variable:  #2c2c4a;
  --syn-number:    #8a5a9a;
  --syn-comment:   rgba(26, 26, 47, 0.35);
  --syn-operator:  #b8860b;
  --syn-type:      #2e8f8a;

  --border:        rgba(0, 0, 0, 0.08);
  --border-focus:  rgba(0, 153, 170, 0.5);
  --shadow:        0 8px 32px rgba(0, 0, 0, 0.08);

  --gutter-bg:     rgba(0, 0, 0, 0.03);
  --gutter-text:   rgba(0, 0, 0, 0.12);

  --blob-opacity: 0.4;
}

/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  background: linear-gradient(135deg, var(--bg-body-from), var(--bg-body-to));
  color: var(--text-primary);
  line-height: var(--line-height);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ── Animated Gradient Background Blob ── */
.gradient-bg {
  position: fixed;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  background: linear-gradient(
    45deg,
    rgba(0, 255, 255, 0.15) 0%,
    rgba(255, 0, 255, 0.15) 50%,
    rgba(0, 255, 255, 0.15) 100%
  );
  transform: rotate(45deg) scale(1.2);
  animation: gradientMove 25s infinite ease-in-out;
  z-index: 0;
  filter: blur(60px);
  opacity: var(--blob-opacity);
  pointer-events: none;
  will-change: transform;
  contain: strict;
}

[data-theme="light"] .gradient-bg {
  background: linear-gradient(
    45deg,
    rgba(0, 153, 170, 0.12) 0%,
    rgba(170, 0, 153, 0.12) 50%,
    rgba(0, 153, 170, 0.12) 100%
  );
}

@keyframes gradientMove {
  0%   { transform: rotate(45deg) translateX(0) scale(1);     }
  50%  { transform: rotate(45deg) translateX(-25%) scale(1.1); }
  100% { transform: rotate(45deg) translateX(-50%) scale(1);   }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--text-dim);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Layout ── */
.app {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* ── Title Bar (Window Chrome) ── */
.title-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.65rem 1.2rem;
  user-select: none;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: background var(--transition), border-color var(--transition);
}

.title-bar__dots {
  display: flex;
  gap: 7px;
}

.title-bar__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.title-bar__dot:hover {
  transform: scale(1.2);
}
.title-bar__dot--red    { background: #ff5f57; box-shadow: 0 0 6px rgba(255, 95, 87, 0.4); }
.title-bar__dot--yellow { background: #febc2e; box-shadow: 0 0 6px rgba(254, 188, 46, 0.4); }
.title-bar__dot--green  { background: #28c840; box-shadow: 0 0 6px rgba(40, 200, 64, 0.4); }

.title-bar__filename {
  color: var(--text-muted);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.title-bar__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ── Theme Toggle ── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 4px 12px 4px 10px;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.theme-toggle:hover {
  border-color: var(--border-focus);
  color: var(--text-secondary);
  box-shadow: 0 0 12px var(--accent-glow-c);
  transform: translateY(-1px);
}

.theme-toggle__icon {
  font-size: 0.9rem;
  line-height: 1;
  transition: transform 0.4s ease;
}

[data-theme="light"] .theme-toggle__icon {
  transform: rotate(180deg);
}

/* ── Editor Panel ── */
.editor {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

/* ── Tab Bar ── */
.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg-glass);
  overflow-x: auto;
  scrollbar-width: none;
}
.tab-bar::-webkit-scrollbar { display: none; }

.tab {
  padding: 0.6rem 1.4rem;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 400;
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  transition: all var(--transition);
  border-right: 1px solid var(--border);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tab:hover {
  color: var(--text-secondary);
  background: var(--bg-glass-hover);
}

.tab.active {
  background: rgba(0, 255, 255, 0.05);
  color: var(--text-primary);
}

[data-theme="light"] .tab.active {
  background: rgba(0, 153, 170, 0.08);
}

.tab.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px var(--accent-glow-c);
}

.tab__icon {
  margin-right: 0.4rem;
  font-size: 0.85rem;
}

/* ── Code Content ── */
.code-content {
  padding: 0;
}

.code-block {
  display: none;
  padding: 1rem 0;
}

.code-block.active {
  display: block;
}

/* ── Code Line ── */
.code-line {
  display: flex;
  align-items: flex-start;
  padding: 1px 0;
  transition: background 0.2s;
}

.code-line:hover {
  background: rgba(0, 255, 255, 0.03);
}

[data-theme="light"] .code-line:hover {
  background: rgba(0, 153, 170, 0.04);
}

.line-num {
  flex-shrink: 0;
  width: var(--gutter-width);
  text-align: right;
  padding-right: 1rem;
  color: var(--gutter-text);
  user-select: none;
  font-size: 0.8rem;
  background: var(--gutter-bg);
  transition: background var(--transition), color var(--transition);
}

.line-content {
  flex: 1;
  padding-left: 1rem;
  min-width: 0;
}

/* ── Syntax Tokens ── */
.t-keyword  { color: var(--syn-keyword);  }
.t-string   { color: var(--syn-string);   }
.t-func     { color: var(--syn-function); text-shadow: 0 0 10px var(--accent-glow-c); }
.t-var      { color: var(--syn-variable); }
.t-num      { color: var(--syn-number);   }
.t-comment  { color: var(--syn-comment); font-style: italic; }
.t-op       { color: var(--syn-operator); }
.t-error    { color: #ff5f57;            }
.t-type     { color: var(--syn-type);     }
.t-bracket  { color: var(--text-muted);   }

/* ── Indentation ── */
.indent-1 { padding-left: calc(1rem + 1.5em); }
.indent-2 { padding-left: calc(1rem + 3em);   }
.indent-3 { padding-left: calc(1rem + 4.5em); }

/* ── Form Elements ── */
.field-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.input-field {
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--syn-string);
  padding: 0.35rem 0.7rem;
  outline: none;
  transition: all var(--transition);
  flex: 1;
  min-width: 120px;
  max-width: 100%;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.input-field:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-glow-c), 0 0 15px var(--accent-glow-c);
  background: var(--bg-input-focus);
}

.input-field::placeholder {
  color: var(--text-dim);
  font-style: italic;
}

.select-field {
  font-family: inherit;
  font-size: 0.85rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--syn-number);
  padding: 0.35rem 0.7rem;
  outline: none;
  cursor: pointer;
  transition: all var(--transition);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M3 4.5L6 8l3-3.5H3z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  padding-right: 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.select-field:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-glow-c);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-field {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-input);
  cursor: pointer;
  position: relative;
  transition: all var(--transition);
  flex-shrink: 0;
}

.checkbox-field:checked {
  background: var(--accent-gradient);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-glow-c);
}

.checkbox-field:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #0f0f1a;
  font-size: 11px;
  font-weight: 700;
}

.checkbox-field:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-glow-c);
}

/* ── Generate Button ── */
.btn-generate {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--accent-gradient);
  color: #0f0f1a;
  border: none;
  border-radius: var(--radius-pill);
  padding: 0.55rem 1.8rem;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 20px var(--accent-glow-c), 0 0 40px var(--accent-glow-m);
}

.btn-generate::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 200%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s ease;
}

.btn-generate:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--accent-glow-c), 0 0 60px var(--accent-glow-m);
}

.btn-generate:hover::before {
  left: 100%;
}

.btn-generate:active {
  transform: translateY(0);
}

[data-theme="light"] .btn-generate {
  color: #ffffff;
}

/* ── Output Section ── */
.output-section {
  margin-top: 0.5rem;
}

.qr-canvas-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--bg-glass);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  margin: 0 1rem 1rem;
  transition: all var(--transition);
  min-height: 80px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.qr-canvas-wrap.has-qr {
  border-style: solid;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px var(--accent-glow-c);
}

[data-theme="light"] .qr-canvas-wrap.has-qr {
  box-shadow: 0 0 15px var(--accent-glow-c);
}

.qr-placeholder {
  color: var(--text-dim);
  font-style: italic;
  font-size: 0.8rem;
}

#qr-output canvas,
#qr-output img {
  border-radius: var(--radius);
  image-rendering: pixelated;
  display: block;
  transition: 
    box-shadow 0.4s ease,
    transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

#qr-output canvas:hover,
#qr-output img:hover {
  box-shadow: 0 0 24px var(--accent-glow-c), 0 0 48px var(--accent-glow-m);
  transform: translateY(-4px) scale(1.02);
}

.qr-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-secondary {
  font-family: inherit;
  font-size: 0.76rem;
  background: var(--bg-glass);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.4rem 1.1rem;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  letter-spacing: 0.05em;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  box-shadow: 0 0 12px var(--accent-glow-c);
  transform: translateY(-1px);
}

/* ── Status Bar ── */
.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-glass);
  color: var(--text-muted);
  padding: 0.3rem 1.2rem;
  font-size: 0.7rem;
  margin-top: 2px;
  border-radius: 0 0 var(--radius) var(--radius);
  border: 1px solid var(--border);
  border-top: none;
  transition: all var(--transition);
  user-select: none;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  letter-spacing: 0.08em;
}

.status-bar__left,
.status-bar__right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.status-bar__item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition);
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.72rem;
  position: relative;
  z-index: 1;
}

.footer .t-comment {
  color: var(--text-dim);
}

.footer a {
  color: var(--accent-cyan);
  text-decoration: none;
  text-shadow: 0 0 8px var(--accent-glow-c);
  transition: all var(--transition);
}

.footer a:hover {
  text-shadow: 0 0 15px var(--accent-glow-c);
  color: var(--text-primary);
}

/* ── Empty Line ── */
.code-line--empty .line-content {
  min-height: 1.7em;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  html { font-size: 12px; }
  .app { padding: 0.5rem; }
  .title-bar__filename { display: none; }
  .input-field { min-width: 80px; }
  .indent-1 { padding-left: calc(1rem + 1em); }
  .indent-2 { padding-left: calc(1rem + 2em); }
  .indent-3 { padding-left: calc(1rem + 3em); }
  .qr-canvas-wrap { margin: 0 0.5rem 0.5rem; padding: 1rem; }
}

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0);   }
}

.app {
  animation: fadeIn 0.6s ease;
}

.code-block.active {
  animation: fadeIn 0.2s ease;
}

.qr-canvas-wrap.has-qr {
  animation: fadeIn 0.3s ease;
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .gradient-bg {
    animation: none;
  }
}

/* ── Tooltip ── */
.copied-tooltip {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--accent-gradient);
  color: #0f0f1a;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 100;
  box-shadow: 0 0 20px var(--accent-glow-c);
}

.copied-tooltip.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

[data-theme="light"] .copied-tooltip {
  color: #ffffff;
}

/* ── Back link ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition:
    color 0.4s ease,
    border-color 0.4s ease,
    box-shadow 0.4s ease,
    transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    background 0.4s ease;
  margin-bottom: 1.5rem;
}

.back-link:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  background: var(--bg-glass-hover);
  box-shadow: 0 0 16px var(--accent-glow-c), 0 0 32px var(--accent-glow-m);
  transform: translateX(-4px);
}

.back-link .back-arrow {
  color: var(--accent-cyan);
  text-shadow: 0 0 8px var(--accent-glow-c);
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              text-shadow 0.4s ease;
}

.back-link:hover .back-arrow {
  transform: translateX(-4px);
  text-shadow: 0 0 14px var(--accent-glow-c);
}