/**
 * PWAKit Kitchen Sink - iOS Native Design
 * Authentic iOS aesthetic with SF Pro typography, inset grouped styling,
 * and Apple's Human Interface Guidelines
 */

/* ============================================================================
   CSS Reset & Root Variables
   ============================================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  /* iOS System Colors - Light Mode */
  --ios-bg: #f2f2f7;
  --ios-grouped-bg: #ffffff;
  --ios-label: #000000;
  --ios-secondary-label: #3c3c43;
  --ios-tertiary-label: #3c3c4399;
  --ios-quaternary-label: #3c3c432e;
  --ios-separator: #3c3c4336;
  --ios-opaque-separator: #c6c6c8;

  /* iOS Accent Colors */
  --ios-blue: #007aff;
  --ios-green: #34c759;
  --ios-orange: #ff9500;
  --ios-red: #ff3b30;
  --ios-teal: #5ac8fa;
  --ios-purple: #af52de;
  --ios-pink: #ff2d55;

  /* iOS Fills */
  --ios-fill: #78788033;
  --ios-secondary-fill: #78788029;
  --ios-tertiary-fill: #7676801f;
  --ios-quaternary-fill: #74748014;

  /* Spacing */
  --ios-inset: 16px;
  --ios-cell-height: 44px;
  --ios-corner-radius: 10px;
  --ios-section-spacing: 35px;

  /* Safe areas */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);

  /* Typography */
  --ios-title-size: 34px;
  --ios-headline-size: 17px;
  --ios-body-size: 17px;
  --ios-callout-size: 16px;
  --ios-subhead-size: 15px;
  --ios-footnote-size: 13px;
  --ios-caption-size: 12px;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --ios-bg: #000000;
    --ios-grouped-bg: #1c1c1e;
    --ios-label: #ffffff;
    --ios-secondary-label: #ebebf5;
    --ios-tertiary-label: #ebebf54d;
    --ios-quaternary-label: #ebebf52e;
    --ios-separator: #54545899;
    --ios-opaque-separator: #38383a;
    --ios-fill: #7878805c;
    --ios-secondary-fill: #78788052;
    --ios-tertiary-fill: #7676803d;
    --ios-quaternary-fill: #74748029;
  }
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', system-ui, sans-serif;
  font-size: var(--ios-body-size);
  line-height: 1.47059;
  letter-spacing: -0.022em;
  color: var(--ios-label);
  background-color: var(--ios-bg);
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================================
   iOS Navigation Bar
   ============================================================================ */

.ios-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ios-bg);
  padding-top: var(--safe-top);
}

.ios-nav-content {
  padding: 0 var(--ios-inset);
}

.ios-nav-large-title {
  font-size: var(--ios-title-size);
  font-weight: 700;
  letter-spacing: 0.011em;
  line-height: 1.1;
  padding: 8px 4px 8px 4px;
  margin: 0;
}

.ios-nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px 16px 4px;
}

.ios-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 100px;
  font-size: var(--ios-caption-size);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.ios-status-pill.native {
  background: var(--ios-green);
  color: white;
}

.ios-status-pill.web {
  background: var(--ios-orange);
  color: white;
}

.ios-status-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
}

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

.ios-content {
  padding: 0 var(--ios-inset);
  padding-bottom: calc(120px + var(--safe-bottom));
}

/* ============================================================================
   iOS Inset Grouped Sections
   ============================================================================ */

.ios-section {
  margin-bottom: var(--ios-section-spacing);
}

.ios-section-header {
  font-size: var(--ios-footnote-size);
  font-weight: 400;
  color: var(--ios-tertiary-label);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding: 0 20px 8px 20px;
}

.ios-section-footer {
  font-size: var(--ios-footnote-size);
  color: var(--ios-tertiary-label);
  padding: 8px 20px 0 20px;
  line-height: 1.4;
}

.ios-group {
  background: var(--ios-grouped-bg);
  border-radius: var(--ios-corner-radius);
  overflow: hidden;
}

/* ============================================================================
   iOS List Cells
   ============================================================================ */

.ios-cell {
  display: flex;
  align-items: center;
  min-height: var(--ios-cell-height);
  padding: 11px 16px;
  gap: 12px;
  position: relative;
  cursor: pointer;
  transition: background-color 0.1s ease;
}

.ios-cell:active {
  background: var(--ios-quaternary-fill);
}

.ios-cell:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 52px;
  right: 0;
  bottom: 0;
  height: 0.5px;
  background: var(--ios-separator);
}

.ios-cell-icon {
  width: 29px;
  height: 29px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.ios-cell-icon.blue { background: var(--ios-blue); }
.ios-cell-icon.green { background: var(--ios-green); }
.ios-cell-icon.orange { background: var(--ios-orange); }
.ios-cell-icon.red { background: var(--ios-red); }
.ios-cell-icon.teal { background: var(--ios-teal); }
.ios-cell-icon.purple { background: var(--ios-purple); }
.ios-cell-icon.pink { background: var(--ios-pink); }
.ios-cell-icon.gray { background: var(--ios-secondary-label); }

.ios-cell-content {
  flex: 1;
  min-width: 0;
}

.ios-cell-title {
  font-size: var(--ios-body-size);
  font-weight: 400;
  color: var(--ios-label);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ios-cell-subtitle {
  font-size: var(--ios-footnote-size);
  color: var(--ios-tertiary-label);
  margin-top: 2px;
}

.ios-cell-value {
  font-size: var(--ios-body-size);
  color: var(--ios-tertiary-label);
  flex-shrink: 0;
}

.ios-cell-chevron {
  width: 7px;
  height: 12px;
  color: var(--ios-quaternary-label);
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.ios-cell-chevron svg {
  display: block;
  width: 100%;
  height: 100%;
}

.ios-cell.expanded .ios-cell-chevron {
  transform: rotate(90deg);
}

/* ============================================================================
   iOS Expandable Content
   ============================================================================ */

.ios-cell-expand {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--ios-grouped-bg);
}

.ios-cell.expanded + .ios-cell-expand {
  max-height: 2000px;
}

.ios-cell-expand-inner {
  padding: 16px;
  border-top: 0.5px solid var(--ios-separator);
}

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

.ios-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 44px;
  padding: 0 20px;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: var(--ios-body-size);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  -webkit-appearance: none;
  appearance: none;
}

.ios-btn:active {
  transform: scale(0.97);
  opacity: 0.7;
}

.ios-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

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

.ios-btn-secondary {
  background: var(--ios-fill);
  color: var(--ios-blue);
}

.ios-btn-success {
  background: var(--ios-green);
  color: white;
}

.ios-btn-warning {
  background: var(--ios-orange);
  color: white;
}

.ios-btn-danger {
  background: var(--ios-red);
  color: white;
}

.ios-btn-tinted {
  background: rgba(0, 122, 255, 0.15);
  color: var(--ios-blue);
}

.ios-btn-plain {
  background: transparent;
  color: var(--ios-blue);
  padding: 0 12px;
}

.ios-btn-small {
  height: 34px;
  padding: 0 14px;
  font-size: var(--ios-subhead-size);
  border-radius: 8px;
}

/* Loading state */
.ios-btn.loading,
.ios-segment-btn.loading {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.ios-btn.loading::after,
.ios-segment-btn.loading::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-right-color: transparent;
  animation: ios-spin 0.75s linear infinite;
}

.ios-btn-small.loading::after {
  width: 14px;
  height: 14px;
}

.ios-segment-btn.loading::after {
  width: 12px;
  height: 12px;
}

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

/* Button Groups */
.ios-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.ios-btn-group:last-child {
  margin-bottom: 0;
}

.ios-btn-row {
  display: flex;
  gap: 8px;
}

.ios-btn-row > * {
  flex: 1;
}

/* ============================================================================
   iOS Form Controls
   ============================================================================ */

.ios-form-group {
  margin-bottom: 16px;
}

.ios-form-group:last-child {
  margin-bottom: 0;
}

.ios-form-label {
  display: block;
  font-size: var(--ios-footnote-size);
  font-weight: 500;
  color: var(--ios-secondary-label);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 6px;
  padding-left: 4px;
}

.ios-input {
  width: 100%;
  height: var(--ios-cell-height);
  padding: 0 12px;
  background: var(--ios-tertiary-fill);
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: var(--ios-body-size);
  color: var(--ios-label);
  -webkit-appearance: none;
  appearance: none;
  transition: background-color 0.15s ease;
}

.ios-input:focus {
  outline: none;
  background: var(--ios-secondary-fill);
}

.ios-input::placeholder {
  color: var(--ios-tertiary-label);
}

.ios-textarea {
  min-height: 88px;
  padding: 12px;
  resize: vertical;
  line-height: 1.4;
}

.ios-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' fill='none'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%233c3c4399' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

@media (prefers-color-scheme: dark) {
  .ios-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' fill='none'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23ebebf54d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  }
}

/* Inline input with button */
.ios-input-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.ios-input-row .ios-input {
  flex: 1;
}

/* ============================================================================
   Platform Detection Grid
   ============================================================================ */

.ios-detection-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.ios-detection-item {
  background: var(--ios-tertiary-fill);
  border-radius: 8px;
  padding: 10px 12px;
  transition: all 0.2s ease;
}

.ios-detection-item.active {
  background: rgba(52, 199, 89, 0.15);
}

.ios-detection-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--ios-tertiary-label);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.ios-detection-value {
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, monospace;
  font-size: var(--ios-footnote-size);
  font-weight: 500;
  color: var(--ios-label);
}

.ios-detection-item.active .ios-detection-value {
  color: var(--ios-green);
}

.ios-user-agent {
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, monospace;
  font-size: 11px;
  color: var(--ios-tertiary-label);
  word-break: break-all;
  line-height: 1.5;
  padding: 8px 0;
}

/* ============================================================================
   Result Display
   ============================================================================ */

.ios-result {
  background: var(--ios-tertiary-fill);
  border-radius: 10px;
  padding: 12px;
  margin-top: 12px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, monospace;
  font-size: var(--ios-footnote-size);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
  animation: ios-fade-in 0.2s ease;
}

.ios-result.success {
  background: rgba(52, 199, 89, 0.12);
  border-left: 3px solid var(--ios-green);
}

.ios-result.error {
  background: rgba(255, 59, 48, 0.12);
  border-left: 3px solid var(--ios-red);
}

@keyframes ios-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================================
   Section Labels
   ============================================================================ */

.ios-label-small {
  font-size: var(--ios-footnote-size);
  font-weight: 500;
  color: var(--ios-tertiary-label);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 16px 0 10px 0;
}

.ios-label-small:first-child {
  margin-top: 0;
}

/* ============================================================================
   Console Panel
   ============================================================================ */

.ios-console {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ios-grouped-bg);
  border-top: 0.5px solid var(--ios-separator);
  z-index: 200;
  transform: translateY(calc(100% - 50px - var(--safe-bottom)));
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  max-height: 60vh;
  border-radius: 16px 16px 0 0;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.ios-console.expanded {
  transform: translateY(0);
}

.ios-console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  padding-bottom: 12px;
  cursor: pointer;
  min-height: 50px;
  position: relative;
}

.ios-console-header::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 36px;
  height: 5px;
  background: var(--ios-quaternary-label);
  border-radius: 100px;
}

.ios-console-title {
  font-size: var(--ios-headline-size);
  font-weight: 600;
  margin: 0;
}

.ios-console-content {
  padding: 0 16px 16px 16px;
  padding-bottom: calc(16px + var(--safe-bottom));
  overflow-y: auto;
  max-height: calc(60vh - 50px - var(--safe-bottom));
}

.ios-log-entry {
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, monospace;
  font-size: 12px;
  line-height: 1.5;
  padding: 8px 0;
  border-bottom: 0.5px solid var(--ios-separator);
  white-space: pre-wrap;
  word-break: break-word;
}

.ios-log-entry:last-child {
  border-bottom: none;
}

.ios-log-entry.info { color: var(--ios-blue); }
.ios-log-entry.success { color: var(--ios-green); }
.ios-log-entry.error { color: var(--ios-red); }
.ios-log-entry.warn { color: var(--ios-orange); }

.ios-log-timestamp {
  color: var(--ios-tertiary-label);
  margin-right: 8px;
  font-variant-numeric: tabular-nums;
}

.ios-empty-state {
  text-align: center;
  padding: 32px;
  color: var(--ios-tertiary-label);
  font-size: var(--ios-subhead-size);
}

/* ============================================================================
   Utility Classes
   ============================================================================ */

.hidden {
  display: none !important;
}

.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 16px; }
.mb-sm { margin-bottom: 8px; }
.mb-md { margin-bottom: 16px; }

/* ============================================================================
   Animations
   ============================================================================ */

@keyframes ios-scale-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.ios-section {
  animation: ios-scale-in 0.4s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}

.ios-section:nth-child(1) { animation-delay: 0.05s; }
.ios-section:nth-child(2) { animation-delay: 0.1s; }
.ios-section:nth-child(3) { animation-delay: 0.15s; }
.ios-section:nth-child(4) { animation-delay: 0.2s; }
.ios-section:nth-child(5) { animation-delay: 0.25s; }
.ios-section:nth-child(6) { animation-delay: 0.3s; }
.ios-section:nth-child(7) { animation-delay: 0.35s; }
.ios-section:nth-child(8) { animation-delay: 0.4s; }

/* ============================================================================
   Responsive
   ============================================================================ */

@media (min-width: 500px) {
  .ios-content {
    max-width: 500px;
    margin: 0 auto;
  }
}

/* ============================================================================
   Print Styles
   ============================================================================ */

@media print {
  .ios-console {
    display: none;
  }
}

/* ============================================================================
   Haptic Feedback Visual Simulation
   ============================================================================ */

.ios-btn:active::after {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0.1;
  border-radius: inherit;
  animation: ios-haptic 0.15s ease;
}

@keyframes ios-haptic {
  0%, 100% { opacity: 0; }
  50% { opacity: 0.15; }
}

/* ============================================================================
   iOS Segmented Control Style for Haptics
   ============================================================================ */

.ios-segment-group {
  display: flex;
  background: var(--ios-tertiary-fill);
  border-radius: 8px;
  padding: 2px;
  gap: 0;
}

.ios-segment-btn {
  flex: 1;
  height: 32px;
  background: transparent;
  border: none;
  border-radius: 7px;
  font-family: inherit;
  font-size: var(--ios-footnote-size);
  font-weight: 500;
  color: var(--ios-label);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.ios-segment-btn:active {
  background: var(--ios-quaternary-fill);
}

.ios-segment-btn.active {
  background: var(--ios-grouped-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  .ios-segment-btn.active {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  }
}