/* ============================================
   花馍传奇 - Main Styles
   ============================================ */

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

:root {
  /* Traditional Chinese color palette */
  --red-primary: #C23B22;
  --red-light: #E8634A;
  --red-dark: #8B1A1A;
  --gold: #D4A843;
  --gold-light: #F0D68A;
  --gold-dark: #A07828;
  --green: #2E7D32;
  --green-light: #66BB6A;
  --green-dark: #1B5E20;
  --cream: #FFF8E7;
  --cream-dark: #F5E6C8;
  --brown: #5D4037;
  --brown-light: #8D6E63;
  --ink: #2C2C2C;
  --ink-light: #555;
  --white: #FEFEFE;
  --shadow: rgba(0, 0, 0, 0.15);
  --shadow-heavy: rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-display: 'Georgia', 'SimSun', 'STSong', serif;
  --font-body: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;

  /* Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap-md: 16px;
  --gap-lg: 24px;
  --gap-xl: 40px;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-round: 50%;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--ink);
  overflow: hidden;
  /* Fix #1: 100vw includes scrollbar width, causing horizontal overflow on mobile */
  width: 100%;
  height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* --- Screen System --- */
/* Fix #3: Screen containers need flex column layout with scrollable content areas */
.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  opacity: 0;
  transition: opacity 0.5s ease;
  overflow: hidden;
}

.screen.active {
  display: flex;
  opacity: 1;
  z-index: 10;
}

.screen.entering {
  display: flex;
  animation: fadeIn 0.5s ease forwards;
}

.screen.leaving {
  display: flex;
  animation: fadeOut 0.4s ease forwards;
}

/* --- Screen Header --- */
.screen-header {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: var(--gap-md) var(--gap-lg);
  /* Fix #9: Safe area for notched phones */
  padding-top: max(var(--gap-md), env(safe-area-inset-top));
  padding-left: max(var(--gap-lg), env(safe-area-inset-left));
  padding-right: max(var(--gap-lg), env(safe-area-inset-right));
  background: linear-gradient(135deg, var(--red-dark), var(--red-primary));
  color: var(--white);
  box-shadow: 0 2px 8px var(--shadow);
  z-index: 20;
  flex-shrink: 0;
}

.screen-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  flex: 1;
  text-align: center;
}

.header-stats {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* --- Buttons --- */
.back-btn {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--white);
  padding: var(--gap-sm) var(--gap-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
  white-space: nowrap;
  /* Fix #2: Minimum 44px touch target per WCAG / Apple HIG */
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.back-btn:hover {
  background: rgba(255,255,255,0.25);
}

/* Fix #2: 44px minimum touch target */
.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-round);
  border: 2px solid var(--gold);
  background: rgba(255,255,255,0.1);
  color: var(--gold);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.icon-btn:hover {
  background: var(--gold);
  color: var(--ink);
}

/* --- Loading Screen --- */
#loading-screen {
  background: linear-gradient(180deg, var(--red-dark) 0%, #4A1515 100%);
  z-index: 100;
}

#loading-screen.hidden {
  display: none !important;
}

.loading-content {
  text-align: center;
  color: var(--cream);
  margin: auto;
}

.loading-title {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--gold-light);
  margin: var(--gap-lg) 0 var(--gap-sm);
  letter-spacing: 0.3em;
}

.loading-subtitle {
  font-size: 1.1rem;
  opacity: 0.8;
  margin-bottom: var(--gap-xl);
}

/* Fix #4: Prevent overflow on very small screens (<320px) */
.loading-bar {
  width: min(300px, 80%);
  height: 4px;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  margin: 0 auto var(--gap-md);
  overflow: hidden;
}

.loading-bar-fill {
  height: 100%;
  background: var(--gold);
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 2px;
}

.loading-text {
  font-size: 0.85rem;
  opacity: 0.6;
}

.huamo-spinner {
  width: 80px;
  height: 80px;
  margin: 0 auto;
  border: 3px solid rgba(255,255,255,0.1);
  border-top-color: var(--gold);
  border-radius: var(--radius-round);
  animation: spin 1s linear infinite;
}

/* --- Main Menu --- */
#main-menu {
  background: var(--cream);
}

.menu-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.wheat-field-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    #87CEEB 0%,
    #B0D4E8 30%,
    #E8D5A0 50%,
    #D4A843 65%,
    #8B7355 80%,
    var(--cream-dark) 100%
  );
  opacity: 0.4;
}

.menu-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--gap-xl);
}

.menu-header {
  text-align: center;
  margin-bottom: var(--gap-xl);
}

.menu-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--gap-md);
  border-radius: var(--radius-round);
  box-shadow: 0 0 30px rgba(212,168,67,0.4);
  object-fit: contain;
}

.menu-emblem {
  display: none;
}

.menu-emblem::after {
  content: '馍';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2.8rem;
  color: var(--red-dark);
  font-weight: bold;
}

.game-title {
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--red-dark);
  letter-spacing: 0.2em;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.game-subtitle {
  font-size: 1rem;
  color: var(--brown-light);
  letter-spacing: 0.3em;
  margin-top: var(--gap-xs);
}

.game-desc {
  font-size: 1.1rem;
  color: var(--ink-light);
  margin-top: var(--gap-md);
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  width: 100%;
  max-width: 320px;
}

/* 2x3 Grid Layout for 6-button menu (mobile-first: 2 columns) */
.menu-buttons.grid-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0 16px;
  max-width: 480px;
  flex-direction: unset;
}

.menu-btn {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: var(--gap-md) var(--gap-lg);
  border: 2px solid var(--gold);
  background: rgba(255,248,231,0.9);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.1rem;
  font-family: var(--font-body);
  color: var(--ink);
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}

/* Grid layout card style - compact, tight around icon+text */
.grid-layout .menu-btn {
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 10px 6px;
  aspect-ratio: auto;
  border-radius: var(--radius-md);
  background: rgba(255,248,231,0.9);
  text-align: center;
  gap: 4px;
  border-width: 1.5px;
}

.menu-btn:hover {
  background: var(--gold-light);
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(212,168,67,0.3);
}

.grid-layout .menu-btn:hover {
  transform: translateY(-4px);
}

.btn-icon {
  font-size: 1.5rem;
  width: 40px;
  text-align: center;
}

.grid-layout .btn-icon {
  font-size: 1.4rem;
  width: auto;
  margin-bottom: 0;
}

.btn-text {
  font-weight: 600;
}

.grid-layout .btn-text {
  font-size: 0.75rem;
  text-align: center;
  line-height: 1.2;
}

.menu-footer {
  position: absolute;
  bottom: var(--gap-lg);
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.version-text {
  font-size: 0.8rem;
  color: var(--brown-light);
  opacity: 0.7;
}

/* --- Modal --- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--cream);
  border-radius: var(--radius-lg);
  max-width: 700px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px var(--shadow-heavy);
  animation: modalIn 0.3s ease;
}

/* Fix #2: 44px minimum touch target for close buttons */
.modal-close {
  position: absolute;
  top: var(--gap-md);
  right: var(--gap-md);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-round);
  border: none;
  background: rgba(0,0,0,0.1);
  color: var(--ink);
  font-size: 1.4rem;
  cursor: pointer;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.modal-close:hover {
  background: var(--red-primary);
  color: var(--white);
}

/* --- Gallery Detail --- */
.gallery-detail {
  padding: 0;
}

.detail-image-wrap {
  width: 100%;
  aspect-ratio: 4/3;
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--cream-dark);
}

.detail-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-info {
  padding: var(--gap-lg);
}

.detail-info h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--red-dark);
  margin-bottom: var(--gap-sm);
}

.detail-description {
  color: var(--ink-light);
  line-height: 1.7;
  margin-bottom: var(--gap-md);
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
}

.meta-tag {
  padding: var(--gap-xs) var(--gap-sm);
  background: var(--cream-dark);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--brown);
}

/* --- Hamburger Menu (mobile only) --- */
.hamburger-btn {
  display: none;
  position: fixed;
  top: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  z-index: 900;
  border: none;
  border-radius: var(--radius-sm);
  background: rgba(44, 44, 44, 0.7);
  backdrop-filter: blur(4px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 10px;
}

.hamburger-btn.hidden {
  display: none !important;
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.hamburger-btn.open .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger-btn.open .hamburger-line:nth-child(2) {
  opacity: 0;
}
.hamburger-btn.open .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 950;
  display: none;
  pointer-events: none;
}

.mobile-nav.open {
  display: block;
  pointer-events: auto;
}

.mobile-nav-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-nav.open .mobile-nav-overlay {
  opacity: 1;
}

.mobile-nav-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  max-width: 80vw;
  height: 100%;
  background: var(--cream);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.mobile-nav.open .mobile-nav-panel {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--gap-md) var(--gap-lg);
  background: linear-gradient(135deg, var(--red-dark), var(--red-primary));
  color: var(--white);
}

.mobile-nav-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.1em;
}

/* Fix #2: 44px minimum touch target */
.mobile-nav-close {
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: var(--white);
  font-size: 1.5rem;
  border-radius: var(--radius-round);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav-items {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--gap-md) 0;
}

.mobile-nav-item {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: var(--gap-md) var(--gap-lg);
  border: none;
  background: transparent;
  font-size: 1.05rem;
  font-family: var(--font-body);
  color: var(--ink);
  cursor: pointer;
  transition: background 0.2s;
  text-align: left;
}

.mobile-nav-item:active {
  background: var(--cream-dark);
}

.mobile-nav-item.active {
  background: rgba(194, 59, 34, 0.08);
  color: var(--red-dark);
  font-weight: 600;
}

.nav-item-icon {
  font-size: 1.3rem;
  width: 32px;
  text-align: center;
}

.mobile-nav-footer {
  padding: var(--gap-md) var(--gap-lg);
  border-top: 1px solid var(--cream-dark);
  font-size: 0.75rem;
  color: var(--brown-light);
  opacity: 0.7;
}

@media (max-width: 768px) {
  .hamburger-btn {
    display: flex;
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--brown-light);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brown);
}

/* --- Responsive --- */
@media (min-width: 769px) {
  .menu-buttons.grid-layout {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .game-title {
    font-size: 2.5rem;
  }

  .screen-header {
    padding: var(--gap-sm) var(--gap-md);
  }

  .screen-title {
    font-size: 1.1rem;
  }

  .menu-btn {
    padding: var(--gap-sm) var(--gap-md);
    font-size: 1rem;
  }

  .menu-buttons.grid-layout {
    grid-template-columns: repeat(2, 1fr);
    max-width: 400px;
  }

  .modal-content {
    width: 95%;
    max-height: 90vh;
  }

  .loading-title {
    font-size: 2rem;
  }

  /* Loading bar now uses min(300px, 80%) in base rule - no override needed */
}

@media (max-width: 480px) {
  .game-title {
    font-size: 2rem;
  }

  .game-subtitle {
    letter-spacing: 0.15em;
  }

  .game-desc {
    font-size: 0.95rem;
  }

  .menu-content {
    padding: var(--gap-md);
  }

  .menu-logo {
    width: 90px;
    height: 90px;
  }

  .menu-buttons {
    max-width: 100%;
  }

  .menu-btn {
    gap: var(--gap-sm);
  }

  .btn-icon {
    font-size: 1.3rem;
    width: 32px;
  }

  .screen-header {
    gap: var(--gap-sm);
  }

  .header-stats {
    font-size: 0.75rem;
  }

  .modal-content {
    width: 96%;
    border-radius: var(--radius-md);
  }

  .detail-image-wrap {
    aspect-ratio: 16/9;
  }

  .detail-info {
    padding: var(--gap-md);
  }

  .detail-info h3 {
    font-size: 1.2rem;
  }

  .menu-footer {
    position: relative;
    bottom: auto;
    margin-top: var(--gap-lg);
  }

  .loading-title {
    font-size: 1.8rem;
    letter-spacing: 0.15em;
  }

  .loading-subtitle {
    font-size: 0.95rem;
  }
}

@media (max-width: 360px) {
  .menu-buttons.grid-layout {
    gap: 8px;
  }

  .grid-layout .btn-icon {
    font-size: 1.6rem;
  }

  .grid-layout .btn-text {
    font-size: 0.7rem;
    /* Fix #7: Allow text wrapping for long button labels */
    word-break: break-all;
    overflow-wrap: break-word;
    hyphens: auto;
  }

  .grid-layout .menu-btn {
    min-height: auto;
    padding: 8px 4px;
  }
}

@media (max-width: 400px) {
  .game-title {
    font-size: 1.7rem;
  }

  .screen-title {
    font-size: 1rem;
  }

  .back-btn {
    font-size: 0.8rem;
    padding: 6px 10px;
    /* Preserve 44px min touch target even at small sizes */
    min-height: 44px;
  }
}

/* ============================================
   Mobile Adaptation Fixes
   ============================================ */

/* Fix #8: iOS smooth scroll momentum for all scrollable containers */
.chapter-content,
.gallery-grid,
.inheritor-grid,
.quiz-container,
.crafting-container,
.modal-content,
.mobile-nav-items {
  -webkit-overflow-scrolling: touch;
}

/* Fix #9: Safe area insets for fixed footer elements */
.menu-footer {
  padding-bottom: env(safe-area-inset-bottom);
}

.mobile-nav-footer {
  padding-bottom: max(var(--gap-md), env(safe-area-inset-bottom));
}

/* Fix #10: Prevent iOS auto-zoom on input focus */
input, select, textarea {
  font-size: 16px;
}

/* Fix #7 is merged into the existing @media (max-width: 360px) block above */