/* ==========================================================================
   Kopdog Dev Tools - Shared Styles
   Matches learn.kopdog.com design system
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Backgrounds */
  --bg-primary: #171C17;
  --bg-surface: #1E241E;
  --bg-surface-light: #282F28;
  --border-color: #3D4A3D;

  /* Text */
  --text-primary: #FAF6F0;
  --text-secondary: #B5AFA5;
  --text-muted: #7A756C;

  /* Semantic Colors */
  --color-success: #7B9E7B;
  --color-warning: #D4A855;
  --color-error: #C2785C;

  /* Tool Accent Colors */
  --color-json: #7B9E7B;
  --color-xml: #6B9E9E;
  --color-sql: #D4A574;
  --color-yaml: #8B7B9E;
  --color-base64: #7B8E9E;
  --color-url: #D47B6B;
  --color-jwt: #9E7B7B;
  --color-timestamp: #7B9E8B;
  --color-json-yaml: #A5947B;
  --color-csv-json: #7B8B9E;
  --color-hash: #9E8B7B;
  --color-uuid: #7B9E9E;
  --color-regex: #D4746B;
  --color-lorem: #8B9E7B;
  --color-mock-data: #9E7B8B;
  --color-qr: #7B7B9E;
  --color-json-schema: #9E9E7B;
  --color-cron: #7B9E7B;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Monaco, Consolas, monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 2px 4px 0 rgba(23, 28, 23, 0.25);
  --shadow-md: 0 4px 12px -2px rgba(23, 28, 23, 0.35);
  --shadow-lg: 0 8px 24px -4px rgba(23, 28, 23, 0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --------------------------------------------------------------------------
   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-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Landing Page
   -------------------------------------------------------------------------- */
.landing-container {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.landing-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.landing-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.landing-subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.site-link {
  color: var(--color-warning);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.site-link:hover {
  color: var(--text-primary);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

@media (max-width: 768px) {
  .tools-grid {
    grid-template-columns: 1fr;
  }
}

/* Tool Card */
.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  cursor: pointer;
}

.tool-card:hover {
  background: var(--bg-surface-light);
  border-color: var(--color-accent, var(--border-color));
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: var(--spacing-sm);
}

.card-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 500;
}

.card-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Navigation Bar
   -------------------------------------------------------------------------- */
.navbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-back {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.navbar-back:hover {
  color: var(--text-primary);
}

.navbar-back svg {
  width: 20px;
  height: 20px;
}

.navbar-title {
  font-size: 1.125rem;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   Tool Page Layout
   -------------------------------------------------------------------------- */
.tool-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  min-height: calc(100vh - 58px);
}

@media (max-width: 768px) {
  .tool-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

/* Panes */
.pane {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface-light);
}

.pane-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.pane-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
}

/* Textareas */
.code-input {
  flex: 1;
  width: 100%;
  min-height: 400px;
  padding: var(--spacing-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  resize: none;
  transition: border-color var(--transition-fast);
}

.code-input:focus {
  outline: none;
  border-color: var(--color-accent, var(--color-success));
}

.code-input::placeholder {
  color: var(--text-muted);
}

.code-input.error {
  border-color: var(--color-error);
}

.code-input:read-only {
  background: var(--bg-surface-light);
  cursor: default;
}

@media (max-width: 768px) {
  .code-input {
    min-height: 200px;
  }
}

/* --------------------------------------------------------------------------
   Error Messages
   -------------------------------------------------------------------------- */
.error-message {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(194, 120, 92, 0.1);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-sm);
  color: var(--color-error);
  font-size: 0.875rem;
  font-family: var(--font-mono);
}

.error-message[hidden] {
  display: none;
}

.info-message {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(123, 142, 158, 0.1);
  border: 1px solid #7B8E9E;
  border-radius: var(--radius-sm);
  color: #7B8E9E;
  font-size: 0.875rem;
  font-family: var(--font-mono);
}

.info-message[hidden] {
  display: none;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background: var(--color-accent, var(--color-success));
  color: var(--bg-primary);
  border-color: var(--color-accent, var(--color-success));
}

.btn-primary:hover {
  filter: brightness(1.1);
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-surface-light);
  color: var(--text-primary);
}

/* Button Group */
.btn-group {
  display: flex;
  gap: var(--spacing-sm);
}

/* --------------------------------------------------------------------------
   Toggle Button
   -------------------------------------------------------------------------- */
.toggle-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.toggle-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.toggle-label.active {
  color: var(--text-primary);
  font-weight: 500;
}

.toggle-switch {
  position: relative;
  width: 48px;
  height: 24px;
  background: var(--bg-surface-light);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.toggle-switch:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--color-accent, var(--color-success));
}

.toggle-switch.active {
  background: var(--color-accent, var(--color-success));
}

.toggle-switch.active::after {
  transform: translateX(24px);
}

/* --------------------------------------------------------------------------
   Copy Success Toast
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-success);
  color: var(--bg-primary);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 500;
  opacity: 0;
  transition: all var(--transition-base);
  z-index: 1000;
}

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

/* --------------------------------------------------------------------------
   JWT Decoder Specific
   -------------------------------------------------------------------------- */
.jwt-sections {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.jwt-section {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.jwt-section-header {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-surface-light);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.jwt-section-body {
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.jwt-header-section .jwt-section-header {
  color: var(--color-error);
}

.jwt-payload-section .jwt-section-header {
  color: var(--color-success);
}

.jwt-signature-section .jwt-section-header {
  color: var(--color-warning);
}

/* --------------------------------------------------------------------------
   Timestamp Converter Specific
   -------------------------------------------------------------------------- */
.timestamp-outputs {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.timestamp-row {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.timestamp-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.timestamp-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.hidden {
  display: none !important;
}

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

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: var(--text-primary);
}