/**
 * MapleFlare Studio — Craft Transitions & Web Interface Guidelines System
 * Adheres to:
 * 1. Vercel Web Interface Guidelines (command.md)
 * 2. Vercel View Transition API Guidelines (css-recipes.md)
 * 3. Obsidian Vault Front-end Design Specifications (design_前端设计.md & design_风格地图.md)
 */

/* === 1. Root & Document Setup === */
:root {
  color-scheme: dark;
  --bg-obsidian: #07080b;
  --bg-card: #0d1017;
  --accent-amber: #f59e0b;
  --accent-cyan: #38bdf8;
  --accent-emerald: #10b981;
  --border-subtle: rgba(255, 255, 255, 0.08);

  /* Timing Variables from View Transition Guidelines */
  --duration-exit: 150ms;
  --duration-enter: 220ms;
  --duration-move: 350ms;
  --ease-craft: cubic-bezier(0.16, 1, 0.3, 1);

  /* Modern CSS Details & Transition Expansion */
  interpolate-size: allow-keywords;
}

html {
  color-scheme: dark;
  scroll-behavior: auto !important;
  overflow-y: scroll !important;
  scrollbar-gutter: stable both-edges !important;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-obsidian);
  color: #f3f4f6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Uniform Page Display Across All Routes === */
.reveal-on-scroll {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

/* === 2. Touch & Focus Accessibility === */
button,
a,
input,
summary,
[role="button"],
.filter-tab,
.region-tab {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* Explicit high-contrast focus rings (never outline: none without focus-visible) */
:focus-visible {
  outline: 2px solid var(--accent-amber) !important;
  outline-offset: 2px !important;
  border-radius: 6px;
}

input:focus-visible {
  outline: 2px solid var(--accent-amber) !important;
  outline-offset: 1px !important;
}

/* === 3. OpenType Tabular Numbers (Dynamic Jitter Lock) === */
.tabular-nums,
.tabular-metric,
[data-tabular="true"],
.font-mono,
time,
.badge-version,
.sla-badge {
  font-variant-numeric: tabular-nums !important;
  font-feature-settings: "tnum" 1, "cv01" 1 !important;
  -webkit-font-feature-settings: "tnum" 1, "cv01" 1 !important;
}

/* === 4. Multi-Page View Transition API (Header & Footer 100% Frozen, Only Main Dissolves) === */
@view-transition {
  navigation: auto;
}

::view-transition {
  pointer-events: none;
}

/* Isolate view transitions strictly to <main> */
:root {
  view-transition-name: none !important;
}

.site-header {
  view-transition-name: none !important;
}

footer {
  view-transition-name: none !important;
}

main {
  view-transition-name: page-main;
  width: 100% !important;
}

::view-transition-group(root),
::view-transition-group(page-main) {
  animation: none !important;
  transform: none !important;
  left: 0 !important;
  top: 0 !important;
  width: 100% !important;
  margin: 0 !important;
}

::view-transition-old(page-main),
::view-transition-new(page-main) {
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  width: 100% !important;
  transform: none !important;
}

::view-transition-old(page-main) {
  animation: 90ms ease-out both craft-fade-out !important;
}

::view-transition-new(page-main) {
  animation: 110ms ease-in both craft-fade-in !important;
}

@keyframes craft-fade-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes craft-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Anti-FOUC Language Loading Lock */
html.i18n-en-loading body {
  opacity: 0 !important;
}

/* Tab Underline / Active Filter Morph */
::view-transition-group(.tab-active-indicator) {
  animation-duration: 220ms;
  animation-timing-function: var(--ease-craft);
}

::view-transition-old(.tab-active-indicator),
::view-transition-new(.tab-active-indicator) {
  animation: none;
  height: 100%;
}

/* === 5. Smooth FAQ Accordion Expansion === */
details.faq-item {
  transition: border-color 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease;
}

details.faq-item::details-content {
  opacity: 0;
  height: 0;
  overflow: hidden;
  transition: height 0.3s var(--ease-craft), opacity 0.25s ease, content-visibility 0.3s allow-discrete;
}

details.faq-item[open]::details-content {
  opacity: 1;
  height: auto;
}

details.faq-item summary {
  list-style: none;
  outline: none;
}

details.faq-item summary::-webkit-details-marker {
  display: none;
}

details.faq-item summary .faq-chevron {
  transition: transform 0.25s var(--ease-craft);
}

details.faq-item[open] summary .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-amber);
}

/* Fallback CSS Grid Accordion for browsers without ::details-content */
@supports not (interpolate-size: allow-keywords) {
  details.faq-item .faq-answer {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s var(--ease-craft), opacity 0.25s ease;
    opacity: 0;
  }
  details.faq-item[open] .faq-answer {
    grid-template-rows: 1fr;
    opacity: 1;
  }
  details.faq-item .faq-answer-inner {
    overflow: hidden;
  }
}

/* === 6. Explicit Transitions (Eliminate transition: all anti-pattern) === */
.interactive-hover {
  transition: transform 0.2s var(--ease-craft), border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, color 0.15s ease !important;
}

.pill-transition {
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.15s ease, box-shadow 0.2s ease !important;
}

/* Safe Hover Zone Bridge for Dropdowns and Buttons */
.safe-hover-target {
  position: relative;
}
.safe-hover-target::after {
  content: '';
  position: absolute;
  inset: -6px;
  pointer-events: auto;
  z-index: 0;
}

/* === 6.1 Mobile Navigation Drawer & Precision Hamburger === */
.hamburger-line {
  transition: transform 0.22s var(--ease-craft), opacity 0.2s ease, background-color 0.2s ease;
  will-change: transform, opacity;
}

#mobileMenuBtn.menu-open .hamburger-line:nth-child(1) {
  transform: translateY(3.25px) rotate(45deg);
}

#mobileMenuBtn.menu-open .hamburger-line:nth-child(2) {
  transform: translateY(-3.25px) rotate(-45deg);
}

#mobileMenu {
  transition: opacity 0.22s var(--ease-craft), transform 0.22s var(--ease-craft);
  will-change: opacity, transform;
}

#mobileMenu.menu-open {
  opacity: 1 !important;
  transform: translateY(0) !important;
  pointer-events: auto !important;
}

#mobileMenuBackdrop {
  transition: opacity 0.2s var(--ease-craft);
  will-change: opacity;
}

#mobileMenuBackdrop.menu-open {
  opacity: 1 !important;
  pointer-events: auto !important;
}

/* === 7. Reduced Motion Accessibility (WCAG 2.2 AAA & Pre-vestibular Safety) === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  ::view-transition-old(*),
  ::view-transition-new(*),
  ::view-transition-group(*) {
    animation-duration: 0s !important;
    animation-delay: 0s !important;
  }

  .ambient-glow-aura,
  .animate-pulse,
  .animate-spin {
    animation: none !important;
    transform: none !important;
    opacity: 0.6 !important;
  }

  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .artisan-card:hover {
    transform: none !important;
  }
}