/* ==========================================================================
   Nodeblue Design System - Secure Share
   ========================================================================== */

:root {
  /* Core palette */
  --nb-bg-root: #0E1424;
  --nb-bg-layer-1: #131B30;
  --nb-bg-layer-2: #18213A;
  --nb-border-subtle: #243056;
  --nb-dark-surface: #0A0F1A;

  /* Text */
  --nb-text-primary: #E6EBF5;
  --nb-text-secondary: #A9B2CC;
  --nb-text-muted: #7E88A8;
  --nb-text-disabled: #55607E;
  --nb-text-on-accent: #FFFFFF;

  /* Accent */
  --nb-accent-primary: #2563EB;
  --nb-accent-hover: #3B82F6;
  --nb-accent-active: #1D4ED8;
  --nb-accent-soft: #1E3A8A;
  --nb-accent-glow: rgba(37, 99, 235, 0.35);

  /* Gradient (Primary CTAs) */
  --nb-gradient-start: #2563EB;
  --nb-gradient-end: #4F46E5;
  --nb-gradient-hover-start: #3B82F6;
  --nb-gradient-hover-end: #6366F1;
  --nb-gradient-active-start: #1D4ED8;
  --nb-gradient-active-end: #4338CA;

  /* Violet accent */
  --nb-violet-hint: #7C3AED;
  --nb-violet-soft: rgba(124, 58, 237, 0.15);
  --nb-violet-border: rgba(124, 58, 237, 0.4);

  /* Interactive tints */
  --nb-accent-tint-subtle: rgba(37, 99, 235, 0.08);
  --nb-accent-tint-soft: rgba(37, 99, 235, 0.12);
  --nb-accent-border-soft: rgba(37, 99, 235, 0.25);

  /* Overlays */
  --nb-overlay-subtle: rgba(255, 255, 255, 0.05);
  --nb-overlay-soft: rgba(255, 255, 255, 0.08);

  /* State colors */
  --nb-success: #2563EB;
  --nb-success-bg: #0F1D2D;
  --nb-warning: #D6A645;
  --nb-warning-bg: #1D1A14;
  --nb-error: #D16464;
  --nb-error-bg: #1D1416;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', Consolas, monospace;
  --text-xs: 0.6875rem;
  --text-sm: 0.75rem;
  --text-base: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.15rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;

  /* Spacing */
  --nb-space-xs: 4px;
  --nb-space-sm: 8px;
  --nb-space-md: 16px;
  --nb-space-lg: 24px;
  --nb-space-xl: 32px;

  /* Radius */
  --nb-radius-sm: 4px;
  --nb-radius-md: 8px;
  --nb-radius-lg: 12px;

  /* Shadows */
  --nb-shadow-1: 0 1px 3px rgba(0, 0, 0, 0.3);
  --nb-shadow-2: 0 4px 12px rgba(0, 0, 0, 0.4);
  --nb-shadow-3: 0 8px 24px rgba(0, 0, 0, 0.5);
  --nb-shadow-accent: 0 4px 14px var(--nb-accent-glow);

  /* Transitions */
  --nb-transition-fast: 0.15s ease;
  --nb-transition-normal: 0.25s ease;
}

/* ==========================================================================
   Reset
   ========================================================================== */

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

/* ==========================================================================
   Base
   ========================================================================== */

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

body {
  font-family: var(--font-sans);
  background: var(--nb-bg-root);
  color: var(--nb-text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Layout
   ========================================================================== */

#app {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--nb-space-xl) var(--nb-space-md);
}

.mode {
  width: 100%;
  max-width: 480px;
  animation: fadeIn var(--nb-transition-normal);
}

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

/* ==========================================================================
   Header
   ========================================================================== */

header {
  text-align: center;
  margin-bottom: var(--nb-space-lg);
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
  color: var(--nb-text-primary);
}

.tagline {
  color: var(--nb-text-secondary);
  font-size: var(--text-base);
}

/* ==========================================================================
   Status Icons
   ========================================================================== */

.icon-success,
.icon-revealed,
.icon-error {
  font-size: var(--text-2xl);
  margin-bottom: var(--nb-space-md);
  display: block;
  line-height: 1.5;
}

.icon-success { color: var(--nb-success); }
.icon-revealed {
  color: var(--nb-accent-primary);
  font-size: inherit;
  line-height: 1;
}
.icon-error { color: var(--nb-error); }

/* ==========================================================================
   Form Fields
   ========================================================================== */

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

label {
  display: block;
  font-size: var(--text-base);
  font-weight: 500;
  margin-bottom: var(--nb-space-sm);
  color: var(--nb-text-primary);
}

.badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 500;
  padding: 2px 8px;
  background: var(--nb-accent-primary);
  color: var(--nb-text-on-accent);
  border-radius: var(--nb-radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-left: var(--nb-space-sm);
  vertical-align: middle;
}

textarea,
input[type="text"],
input[type="password"],
select {
  width: 100%;
  padding: 12px var(--nb-space-md);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  color: var(--nb-text-primary);
  background: var(--nb-bg-root);
  border: 1px solid var(--nb-border-subtle);
  border-radius: var(--nb-radius-md);
  transition: border-color var(--nb-transition-fast), box-shadow var(--nb-transition-fast);
  min-height: 44px;
}

textarea {
  resize: vertical;
  min-height: 100px;
  font-family: var(--font-mono);
  font-size: var(--text-base);
}

textarea:focus,
input:focus,
select:focus {
  outline: none;
  border-color: var(--nb-accent-primary);
  box-shadow: 0 0 0 3px var(--nb-accent-border-soft);
}

textarea::placeholder,
input::placeholder {
  color: var(--nb-text-muted);
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%237E88A8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

/* Character Count */
.char-count {
  text-align: right;
  font-size: var(--text-sm);
  color: var(--nb-text-muted);
  margin-top: var(--nb-space-xs);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Input Wrapper (password toggle)
   ========================================================================== */

.input-wrapper {
  position: relative;
}

.input-wrapper input {
  padding-right: 44px;
}

.icon-btn {
  position: absolute;
  right: 0;
  top: 0;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  color: var(--nb-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--nb-transition-fast);
  border-radius: var(--nb-radius-md);
}

.icon-btn:hover {
  color: var(--nb-text-primary);
}

.icon-btn:focus {
  outline: none;
  color: var(--nb-accent-primary);
}

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

.btn-primary,
.btn-secondary,
.btn-text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--nb-space-sm);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  font-weight: 500;
  border: none;
  border-radius: var(--nb-radius-md);
  cursor: pointer;
  transition: all var(--nb-transition-fast);
  text-decoration: none;
  min-height: 44px;
}

.btn-label,
.btn-loading {
  color: inherit;
}

/* Primary Button - Gradient (matches pass.nodeblue.com .generate-btn) */
.btn-primary {
  width: 100%;
  padding: var(--nb-space-sm) var(--nb-space-md);
  background: linear-gradient(135deg, var(--nb-gradient-start) 0%, var(--nb-gradient-end) 100%);
  color: var(--nb-text-on-accent);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  box-shadow: var(--nb-shadow-accent);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--nb-gradient-hover-start) 0%, var(--nb-gradient-hover-end) 100%);
  box-shadow: 0 6px 20px var(--nb-accent-glow);
  transform: translateY(-1px);
}

.btn-primary:focus-visible {
  background: linear-gradient(135deg, var(--nb-gradient-hover-start) 0%, var(--nb-gradient-hover-end) 100%);
  box-shadow: 0 6px 20px var(--nb-accent-glow);
  outline: 2px solid var(--nb-text-on-accent);
  outline-offset: 2px;
}

.btn-primary:active:not(:disabled) {
  background: linear-gradient(135deg, var(--nb-gradient-active-start) 0%, var(--nb-gradient-active-end) 100%);
  box-shadow: var(--nb-shadow-1);
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/* Secondary Button */
.btn-secondary {
  padding: var(--nb-space-sm) var(--nb-space-md);
  background: transparent;
  color: var(--nb-text-primary);
  border: 1px solid var(--nb-accent-border-soft);
}

.btn-secondary:hover {
  background: var(--nb-accent-tint-subtle);
  border-color: var(--nb-accent-primary);
}

.btn-secondary:focus {
  outline: none;
  border-color: var(--nb-accent-primary);
  box-shadow: 0 0 0 3px var(--nb-accent-border-soft);
}

.btn-secondary.copied,
.btn-secondary.copied:hover,
.btn-secondary.copied:focus {
  background: var(--nb-success);
  border-color: var(--nb-success);
  color: var(--nb-text-on-accent);
}

/* Text Button */
.btn-text {
  padding: var(--nb-space-sm) var(--nb-space-md);
  background: none;
  color: var(--nb-accent-hover);
  border: none;
}

.btn-text:hover {
  color: var(--nb-text-primary);
  background: var(--nb-accent-tint-subtle);
}

.btn-text:focus {
  outline: none;
  background: var(--nb-accent-tint-soft);
}

/* ==========================================================================
   Secret URL Box
   ========================================================================== */

.secret-url-box {
  display: flex;
  gap: var(--nb-space-sm);
  margin-bottom: var(--nb-space-lg);
  background: var(--nb-bg-layer-1);
  border: 1px solid var(--nb-border-subtle);
  border-radius: var(--nb-radius-lg);
  padding: var(--nb-space-md);
}

.secret-url-box input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  background: var(--nb-bg-root);
  border: 1px solid var(--nb-border-subtle);
  border-radius: var(--nb-radius-md);
  padding: 12px var(--nb-space-md);
  color: var(--nb-text-primary);
  min-height: 44px;
}

.secret-url-box .btn-secondary {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--nb-space-xs);
}

.secret-url-box .btn-secondary svg {
  flex-shrink: 0;
}

.icon-hidden {
  display: none;
}

/* ==========================================================================
   Info Box (Card)
   ========================================================================== */

.info-box {
  background: var(--nb-bg-layer-1);
  border: 1px solid var(--nb-border-subtle);
  border-radius: var(--nb-radius-lg);
  padding: var(--nb-space-md);
  margin-bottom: var(--nb-space-lg);
}

.info-box p {
  font-size: var(--text-base);
  color: var(--nb-text-secondary);
  margin-bottom: var(--nb-space-xs);
}

.info-box p:last-child {
  margin-bottom: 0;
}

.info-box strong {
  color: var(--nb-text-primary);
  font-weight: 500;
}

/* ==========================================================================
   Transparency Panel (Progressive Disclosure)
   ========================================================================== */

.transparency-trigger {
  display: flex;
  align-items: center;
  gap: var(--nb-space-xs);
  width: 100%;
  padding: var(--nb-space-sm) 0;
  margin-bottom: var(--nb-space-md);
  background: none;
  border: none;
  color: var(--nb-text-secondary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: color var(--nb-transition-fast);
}

.transparency-trigger:hover,
.transparency-trigger:focus {
  color: var(--nb-accent);
  outline: none;
}

.transparency-trigger .transparency-icon {
  flex-shrink: 0;
}

.transparency-trigger span {
  flex: 1;
  text-align: left;
}

.transparency-chevron {
  flex-shrink: 0;
  transition: transform var(--nb-transition-fast);
}

.transparency-trigger[aria-expanded="true"] .transparency-chevron {
  transform: rotate(180deg);
}

.transparency-panel {
  background: var(--nb-bg-layer-1);
  border: 1px solid var(--nb-border-subtle);
  border-radius: var(--nb-radius-lg);
  padding: var(--nb-space-md);
  margin-bottom: var(--nb-space-lg);
  overflow: hidden;
  animation: fadeIn var(--nb-transition-normal) ease;
}

.transparency-section {
  margin-bottom: var(--nb-space-md);
}

.transparency-section:last-child {
  margin-bottom: 0;
}

.transparency-section-title {
  display: flex;
  align-items: center;
  gap: var(--nb-space-xs);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--nb-text-primary);
  margin-bottom: var(--nb-space-sm);
  letter-spacing: 0.02em;
}

.transparency-section--safe .transparency-section-title {
  color: var(--nb-success);
}

.transparency-code {
  background: var(--nb-bg-root);
  border-radius: var(--nb-radius-md);
  padding: var(--nb-space-sm);
}

.transparency-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--nb-space-xs);
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.transparency-key {
  color: var(--nb-text-secondary);
  min-width: 100px;
}

.transparency-value {
  color: var(--nb-accent);
  font-weight: 500;
  word-break: break-all;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.transparency-comment {
  color: var(--nb-text-muted);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-style: italic;
}

.transparency-safe-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.transparency-safe-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--nb-space-xs);
  padding: 4px 0;
  font-size: var(--text-sm);
}

.transparency-safe-item {
  color: var(--nb-success);
  font-weight: 500;
}

.transparency-safe-item::before {
  content: "• ";
}

/* Mobile responsive: stack on small screens */
@media (max-width: 480px) {
  .transparency-row {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0;
    border-bottom: 1px solid var(--nb-border-subtle);
  }

  .transparency-row:last-child {
    border-bottom: none;
  }

  .transparency-key {
    min-width: auto;
    font-weight: 600;
  }

  .transparency-value {
    max-width: 100%;
  }

  .transparency-comment {
    display: block;
    margin-top: 2px;
  }

  .transparency-safe-list li {
    flex-direction: column;
    gap: 2px;
    padding: 6px 0;
  }
}

/* ==========================================================================
   Secret Container (Card)
   ========================================================================== */

.secret-container {
  background: var(--nb-bg-layer-1);
  border: 1px solid var(--nb-border-subtle);
  border-radius: var(--nb-radius-lg);
  padding: var(--nb-space-md);
  margin-bottom: var(--nb-space-lg);
}

.secret-container pre {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: var(--nb-space-md);
  max-height: 300px;
  overflow-y: auto;
  color: var(--nb-text-primary);
}

.secret-container .btn-secondary {
  width: 100%;
}

/* ==========================================================================
   Warning & Error Messages
   ========================================================================== */

.warning {
  font-size: var(--text-base);
  color: var(--nb-warning);
  text-align: center;
  margin-top: var(--nb-space-md);
  padding: 12px var(--nb-space-md);
  background: var(--nb-warning-bg);
  border-radius: var(--nb-radius-md);
  border: 1px solid rgba(214, 166, 69, 0.3);
}

.error-message {
  font-size: var(--text-base);
  color: var(--nb-error);
  text-align: center;
  margin-top: var(--nb-space-md);
  padding: 12px var(--nb-space-md);
  background: var(--nb-error-bg);
  border-radius: var(--nb-radius-md);
  border: 1px solid rgba(209, 100, 100, 0.3);
}

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

.footer {
  text-align: center;
  padding: var(--nb-space-lg);
  color: var(--nb-text-muted);
  font-size: var(--text-base);
}

.trust-indicators {
  display: flex;
  justify-content: center;
  gap: var(--nb-space-md);
  flex-wrap: wrap;
  margin-bottom: var(--nb-space-sm);
}

.trust-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--nb-text-muted);
  letter-spacing: 0.01em;
  line-height: 1;
  white-space: nowrap;
}

.trust-chip-icon {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  opacity: 0.55;
}

.footer-attribution {
  color: var(--nb-text-secondary);
  font-size: 0.8125rem;
  margin-bottom: 4px;
}

.footer-link {
  color: var(--nb-text-secondary);
  text-decoration: underline;
  text-decoration-color: var(--nb-border-subtle);
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.footer-link:hover,
.footer-link:focus {
  color: var(--nb-accent-primary);
  text-decoration-color: var(--nb-accent-primary);
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.8125rem;
  flex-wrap: wrap;
}

.footer-nav-divider {
  color: var(--nb-text-disabled);
}

.footer-version {
  color: var(--nb-text-disabled);
  font-size: 0.6875rem;
  margin: 0;
  opacity: 0.7;
}

/* ==========================================================================
   Responsive - Mobile First
   ========================================================================== */

@media (max-width: 480px) {
  #app {
    padding: var(--nb-space-lg) var(--nb-space-md);
    align-items: flex-start;
    padding-top: 48px;
  }

  .secret-url-box {
    flex-direction: column;
  }

  .secret-url-box .btn-secondary {
    width: 100%;
  }
}

@media (min-width: 768px) {
  header h1 {
    font-size: 1.5rem;
  }
}

/* ==========================================================================
   Challenge Page
   ========================================================================== */

.challenge-mode {
  text-align: center;
}

.challenge-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--nb-border-subtle);
  border-top-color: var(--nb-accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--nb-space-lg);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.challenge-progress {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--nb-space-sm);
  margin: var(--nb-space-lg) 0;
  font-size: var(--text-sm);
}

.progress-step {
  color: var(--nb-text-muted);
  padding: var(--nb-space-xs) var(--nb-space-sm);
  border-radius: var(--nb-radius-sm);
  transition: all var(--nb-transition-fast);
}

.progress-step.active {
  color: var(--nb-accent-primary);
  background: var(--nb-accent-tint-subtle);
  font-weight: 500;
}

.progress-step.completed {
  color: var(--nb-success);
}

.progress-arrow {
  color: var(--nb-text-disabled);
  font-size: var(--text-xs);
}

.challenge-mode .error-message {
  margin-bottom: var(--nb-space-lg);
}

.challenge-mode #challenge-actions {
  display: flex;
  flex-direction: column;
  gap: var(--nb-space-md);
}