/* ================================================
   CodeFmt — Premium Code Formatter
   Design System & Styles
   ================================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-primary);
  color: var(--text-1);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--dur-slow), color var(--dur-slow);
}

/* === Custom Properties — Dark Theme (default) === */
:root {
  /* Backgrounds */
  --bg-primary: #06060f;
  --bg-surface: rgba(15, 15, 35, 0.55);
  --bg-input: rgba(8, 8, 22, 0.85);
  --bg-hover: rgba(99, 102, 241, 0.07);
  --bg-btn-ghost: rgba(99, 102, 241, 0.06);

  /* Borders */
  --border: rgba(99, 102, 241, 0.12);
  --border-hover: rgba(99, 102, 241, 0.25);
  --border-focus: rgba(0, 212, 255, 0.45);

  /* Text */
  --text-1: #e2e8f0;
  --text-2: #94a3b8;
  --text-3: #64748b;

  /* Accents */
  --accent-1: #00d4ff;
  --accent-2: #a855f7;
  --gradient: linear-gradient(135deg, #00d4ff, #a855f7);
  --gradient-hover: linear-gradient(135deg, #33ddff, #b96dff);

  /* Semantic */
  --green: #10b981;
  --red: #ef4444;
  --amber: #f59e0b;

  /* Effects */
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.45);
  --glow: 0 0 24px rgba(0, 212, 255, 0.12);

  /* Radii */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;

  /* Timing */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 250ms;
  --dur-slow: 400ms;
  --dur-fast: 150ms;

  /* Fonts */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;

  /* Syntax tokens (dark) */
  --syn-keyword: #c792ea;
  --syn-string: #c3e88d;
  --syn-number: #f78c6c;
  --syn-comment: #546e7a;
  --syn-function: #82aaff;
  --syn-operator: #89ddff;
  --syn-tag: #f07178;
  --syn-attr-name: #ffcb6b;
  --syn-attr-value: #c3e88d;
  --syn-punctuation: #89ddff;
  --syn-property: #f78c6c;
  --syn-boolean: #ff5370;
  --syn-selector: #c792ea;
}

/* === Light Theme === */
[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-surface: rgba(255, 255, 255, 0.7);
  --bg-input: rgba(255, 255, 255, 0.92);
  --bg-hover: rgba(99, 102, 241, 0.05);
  --bg-btn-ghost: rgba(99, 102, 241, 0.05);

  --border: rgba(99, 102, 241, 0.1);
  --border-hover: rgba(99, 102, 241, 0.2);
  --border-focus: rgba(99, 102, 241, 0.45);

  --text-1: #1e293b;
  --text-2: #475569;
  --text-3: #94a3b8;

  --shadow: 0 4px 24px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
  --glow: 0 0 24px rgba(99, 102, 241, 0.08);

  /* Syntax tokens (light) */
  --syn-keyword: #7c3aed;
  --syn-string: #059669;
  --syn-number: #d97706;
  --syn-comment: #9ca3af;
  --syn-function: #2563eb;
  --syn-operator: #0891b2;
  --syn-tag: #dc2626;
  --syn-attr-name: #d97706;
  --syn-attr-value: #059669;
  --syn-punctuation: #6366f1;
  --syn-property: #ea580c;
  --syn-boolean: #dc2626;
  --syn-selector: #7c3aed;
}

/* === Prism.js Token Overrides === */
code[class*="language-"],
pre[class*="language-"] {
  color: var(--text-1) !important;
  background: transparent !important;
  text-shadow: none !important;
  font-family: var(--font-mono) !important;
  font-size: 0.8125rem !important;
  line-height: 1.7 !important;
}
.token.keyword,
.token.atrule { color: var(--syn-keyword) !important; }
.token.string,
.token.char,
.token.template-string { color: var(--syn-string) !important; }
.token.number { color: var(--syn-number) !important; }
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata { color: var(--syn-comment) !important; font-style: italic; }
.token.function { color: var(--syn-function) !important; }
.token.operator { color: var(--syn-operator) !important; }
.token.tag { color: var(--syn-tag) !important; }
.token.attr-name { color: var(--syn-attr-name) !important; }
.token.attr-value { color: var(--syn-attr-value) !important; }
.token.punctuation { color: var(--syn-punctuation) !important; }
.token.property { color: var(--syn-property) !important; }
.token.boolean,
.token.constant { color: var(--syn-boolean) !important; }
.token.selector { color: var(--syn-selector) !important; }

/* === Custom Scrollbar === */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.18);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.32);
}

/* === Animated Background === */
.bg-effects {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.22;
  will-change: transform;
}

.bg-orb-1 {
  width: 650px;
  height: 650px;
  background: var(--accent-1);
  top: -220px;
  right: -120px;
  animation: orbFloat1 28s var(--ease) infinite;
}

.bg-orb-2 {
  width: 450px;
  height: 450px;
  background: var(--accent-2);
  bottom: -120px;
  left: -80px;
  animation: orbFloat2 32s var(--ease) infinite;
}

.bg-orb-3 {
  width: 300px;
  height: 300px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  top: 45%;
  left: 45%;
  animation: orbFloat3 24s var(--ease) infinite;
}

[data-theme="light"] .bg-orb { opacity: 0.12; }

@keyframes orbFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -40px) scale(1.08); }
  66% { transform: translate(-30px, 50px) scale(0.92); }
}
@keyframes orbFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-40px, -30px) scale(0.9); }
  66% { transform: translate(50px, 20px) scale(1.12); }
}
@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-60px, 40px) scale(1.15); }
}

/* === App Layout === */
.app {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === Header === */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  animation: fadeInDown 0.5s var(--ease) both;
}

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

.logo-icon {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  background: var(--gradient);
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  animation: logoPulse 3s ease-in-out infinite;
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
}

.logo-text span {
  background: var(--gradient);
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.shortcut-hint {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: var(--text-3);
}

.shortcut-hint kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-2);
}

.btn-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--dur) var(--ease);
}

.btn-icon:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
  color: var(--text-1);
  box-shadow: var(--glow);
  transform: scale(1.05);
}

/* Theme toggle icons */
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* === Toolbar === */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  animation: fadeInDown 0.5s var(--ease) 0.1s both;
}

.toolbar-left,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 0.2rem;
}

/* Select Controls */
.select-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.select-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

.select-wrapper {
  position: relative;
}

.select-wrapper select {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-1);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.4rem 2rem 0.4rem 0.65rem;
  cursor: pointer;
  outline: none;
  transition: all var(--dur-fast) var(--ease);
}

.select-wrapper select:hover {
  border-color: var(--border-hover);
}

.select-wrapper select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.select-chevron {
  position: absolute;
  right: 0.55rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  pointer-events: none;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  outline: none;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 2px 12px rgba(0, 212, 255, 0.2);
}

.btn-primary:hover {
  background: var(--gradient-hover);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-1);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
  box-shadow: var(--glow);
}

.btn-ghost {
  background: var(--bg-btn-ghost);
  color: var(--text-2);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  color: var(--text-1);
  background: var(--bg-hover);
  border-color: var(--border);
}

/* === Editor Panels === */
.editor {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  flex: 1;
  min-height: 0;
  animation: fadeInUp 0.6s var(--ease) 0.2s both;
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  min-height: 520px;
}

.panel:hover {
  border-color: var(--border-hover);
}

.panel:focus-within {
  border-color: var(--border-focus);
  box-shadow: var(--shadow), var(--glow);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .panel-header {
  background: rgba(0, 0, 0, 0.02);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.panel-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
}

.format-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--gradient);
  color: #fff;
  transition: opacity var(--dur) var(--ease);
}

.format-badge.hidden {
  opacity: 0;
  visibility: hidden;
}

.panel-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* Input Textarea */
#inputEditor {
  flex: 1;
  width: 100%;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  tab-size: 4;
  -moz-tab-size: 4;
}

#inputEditor::placeholder {
  color: var(--text-3);
  font-style: italic;
}

/* Output Panel */
.output-body {
  position: relative;
}

#outputEditor {
  margin: 0;
  padding: 1rem 1.25rem;
  height: 100%;
  overflow: auto;
  background: transparent !important;
  font-family: var(--font-mono) !important;
  font-size: 0.8125rem !important;
  line-height: 1.7 !important;
  word-wrap: break-word;
  white-space: pre-wrap;
}

#outputEditor.hidden {
  display: none;
}

/* Output Placeholder */
.output-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  text-align: center;
  padding: 2rem;
}

.output-placeholder.hidden {
  display: none;
}

.placeholder-icon {
  color: var(--text-3);
  opacity: 0.4;
  animation: placeholderPulse 3s ease-in-out infinite;
}

.placeholder-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-2);
}

.placeholder-hint {
  font-size: 0.8rem;
  color: var(--text-3);
  max-width: 300px;
}

.placeholder-hint kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-2);
}

/* Error State */
.panel-output.has-error {
  border-color: rgba(239, 68, 68, 0.3);
}

.panel-output.has-error .panel-header {
  border-bottom-color: rgba(239, 68, 68, 0.2);
}

.error-output {
  color: var(--red) !important;
}

/* === Footer === */
.footer {
  padding: 1.25rem 0;
  text-align: center;
  animation: fadeInUp 0.6s var(--ease) 0.3s both;
}

.footer p {
  font-size: 0.75rem;
  color: var(--text-3);
}

/* === Toast Notifications === */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  color: var(--text-1);
  font-size: 0.8125rem;
  font-weight: 500;
  white-space: nowrap;
  animation: toastSlideIn 0.35s var(--ease) both;
  pointer-events: auto;
}

.toast.toast-exit {
  animation: toastSlideOut 0.3s var(--ease) both;
}

.toast-icon {
  flex-shrink: 0;
  font-size: 1rem;
}

.toast-success { border-left: 3px solid var(--green); }
.toast-error { border-left: 3px solid var(--red); }
.toast-info { border-left: 3px solid var(--accent-1); }

/* === Utility === */
.hidden {
  display: none !important;
}

/* === Animations === */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes logoPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

@keyframes placeholderPulse {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.08); opacity: 0.25; }
}

@keyframes toastSlideIn {
  from { opacity: 0; transform: translateX(40px) scale(0.95); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastSlideOut {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(40px) scale(0.95); }
}

/* === Responsive === */
@media (max-width: 900px) {
  .editor {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: 360px;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-left,
  .toolbar-right {
    justify-content: center;
  }

  .toolbar-divider {
    display: none;
  }

  .shortcut-hint {
    display: none;
  }
}

@media (max-width: 520px) {
  .app {
    padding: 0 0.75rem;
  }

  .btn span {
    display: none;
  }

  .btn {
    padding: 0.5rem 0.65rem;
  }

  .logo-text {
    font-size: 1.1rem;
  }
}