/* ===================================
   Tools.ooo.run - Design System
   Modern, Clean, Minimalist
   Light Theme Default
   =================================== */

/* CSS Variables - Light Theme */
:root {
  /* Colors - Light Palette */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f3f5;
  --bg-card: #ffffff;
  --bg-hover: #e9ecef;

  /* Text Colors */
  --text-primary: #1a1a1a;
  --text-secondary: #495057;
  --text-tertiary: #868e96;
  --text-muted: #adb5bd;

  /* Accent Colors - Green */
  --accent-primary: #10b981;
  --accent-secondary: #34d399;
  --accent-light: #ecfdf5;
  --accent-glow: rgba(16, 185, 129, 0.1);

  /* Success/Error */
  --success: #10b981;
  --error: #ef4444;

  /* Borders */
  --border-subtle: rgba(0, 0, 0, 0.04);
  --border-default: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.12);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 0 3px var(--accent-glow);

  /* Sidebar */
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===================================
   Layout - Sidebar + Main
   =================================== */

.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ===================================
   Sidebar Navigation
   =================================== */

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  transition: width var(--transition-normal);
}

.sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navigation */
.sidebar-nav {
  flex: 1;
  padding: var(--space-md);
  overflow-y: auto;
}

.nav-section {
  margin-bottom: var(--space-lg);
}

.nav-section-title {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-xs);
}

.nav-list {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--space-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent-primary);
}

.nav-link-icon {
  font-size: 1.25rem;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.nav-link-text {
  white-space: nowrap;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

/* Language Selector in Sidebar */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.lang-btn-content {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lang-dropdown {
  position: absolute;
  bottom: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  z-index: 100;
  overflow: hidden;
}

.lang-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-option:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.lang-option.active {
  color: var(--accent-primary);
  background: var(--accent-light);
}

/* ===================================
   Main Content Area
   =================================== */

.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-header {
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.main-content {
  flex: 1;
  padding: var(--space-xl);
}

/* ===================================
   Tool Sections
   =================================== */

.tool-section {
  display: none;
  animation: fadeIn var(--transition-normal);
}

.tool-section.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================
   Card Component
   =================================== */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.card-header {
  margin-bottom: var(--space-lg);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.card-description {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* ===================================
   Form Elements
   =================================== */

.input-group {
  margin-bottom: var(--space-lg);
}

.input-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.input-wrapper {
  position: relative;
}

textarea,
input[type="text"] {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  resize: vertical;
  transition: all var(--transition-fast);
}

textarea {
  min-height: 140px;
}

textarea:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
  background: var(--bg-secondary);
}

textarea::placeholder,
input[type="text"]::placeholder {
  color: var(--text-muted);
}

/* ===================================
   Buttons
   =================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

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

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: var(--radius-sm);
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-group {
  display: flex;
  gap: var(--space-sm);
}

/* ===================================
   Two Column Layout (Base64)
   =================================== */

.converter-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-lg);
  align-items: start;
}

@media (max-width: 900px) {
  .converter-grid {
    grid-template-columns: 1fr;
  }
}

.converter-panel {
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.panel-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.panel-actions {
  display: flex;
  gap: var(--space-xs);
}

/* Static Exchange Icon */
.swap-section {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: stretch;
  padding-top: 0;
}

.exchange-icon {
  width: 32px;
  height: 32px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.6;
}

/* ===================================
   QR Code Generator
   =================================== */

.qr-generator {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

@media (max-width: 900px) {
  .qr-generator {
    grid-template-columns: 1fr;
  }
}

.qr-input-section {
  display: flex;
  flex-direction: column;
}

.qr-preview-section {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.qr-preview {
  width: 240px;
  height: 240px;
  background: white;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.qr-preview img,
.qr-preview canvas,
.qr-preview svg {
  max-width: 100%;
  max-height: 100%;
}

.qr-placeholder {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
}

.qr-options {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.qr-size-select {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
}

/* ===================================
   QR Code Decoder
   =================================== */

.qr-decoder {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

@media (max-width: 900px) {
  .qr-decoder {
    grid-template-columns: 1fr;
  }
}

.upload-zone {
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-3xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-tertiary);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent-primary);
  background: var(--accent-light);
}

.upload-zone-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.6;
}

.upload-zone-text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-sm);
}

.upload-zone-hint {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.upload-preview {
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius-md);
  display: none;
  box-shadow: var(--shadow-md);
}

.upload-preview.active {
  display: block;
}

.decode-result {
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.result-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-tertiary);
  margin-bottom: var(--space-md);
}

.result-content {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--text-primary);
  word-break: break-all;
  min-height: 80px;
}

.result-placeholder {
  color: var(--text-muted);
  font-style: italic;
}

/* ===================================
   Footer
   =================================== */

.footer {
  margin-top: auto;
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  background: var(--bg-secondary);
}

.footer-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.footer-link {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
}

.footer-privacy {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
}

/* ===================================
   Toast Notifications
   =================================== */

.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: slideIn var(--transition-normal);
}

.toast.success {
  border-left: 3px solid var(--success);
}

.toast.error {
  border-left: 3px solid var(--error);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===================================
   Utilities
   =================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-mono {
  font-family: var(--font-mono);
}

.mt-md {
  margin-top: var(--space-md);
}

.mb-md {
  margin-bottom: var(--space-md);
}

/* ===================================
   Responsive - Mobile Sidebar
   =================================== */

@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .sidebar-nav {
    padding: var(--space-sm);
  }

  .nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
  }

  .nav-item {
    margin-bottom: 0;
  }

  .nav-link {
    padding: var(--space-sm) var(--space-md);
  }

  .sidebar-footer {
    display: block;
    border-top: none;
    padding-top: 0;
  }

  .lang-btn {
    background: var(--bg-primary);
  }

  .app-layout {
    flex-direction: column;
  }

  .main-wrapper {
    margin-left: 0;
  }

  .main-content {
    padding: var(--space-md);
  }
}