/* [file name]: styles.css */
/* [file content begin] */
/* -----------------------------------------------------
   GLOBAL VARIABLES
----------------------------------------------------- */
:root {
  --accent-primary: #003366;
  --accent-pill-bg: #eaf2ff;
  --accent-pill-text: #0b3d91;
  --background-blur: 6px;
  --background-opacity: 0.32;
}

/* PD THEME (light blue) */
body.pd {
  --accent-primary: #0067c0;
  --accent-pill-bg: #e7f2ff;
  --accent-pill-text: #004a87;
  --background-image: url('../images/background_pd.jpg');
}

/* SD (English) THEME (dark navy) */
body.sd {
  --accent-primary: #1d3557;
  --accent-pill-bg: #f0f4ff;
  --accent-pill-text: #1d3557;
  --background-image: url('../images/background_sd.jpg');
}

/* SD Chinese THEME (elegant red) */
body.sd-cn {
  --accent-primary: #b30000;
  --accent-pill-bg: #ffeceb;
  --accent-pill-text: #b30000;
  --background-image: url('../images/background_sd.jpg');
}

/* -----------------------------------------------------
   GLOBAL LAYOUT
----------------------------------------------------- */

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--accent-primary);
  color: #222;
  background-image: var(--background-image);
  background-size: cover;
  background-attachment: fixed;
  background-position: center;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  backdrop-filter: blur(var(--background-blur));
  background: rgba(255,255,255,var(--background-opacity));
  pointer-events: none;
  z-index: -1;
}

/* Dark mode theme */
body.dark {
  --accent-primary: #ffffff;
  --accent-pill-bg: #333;
  --accent-pill-text: #eee;
  --background-opacity: 0.15;
}

body.dark {
  background-color: #0f0f0f;
  color: #f2f2f2;
}

body.dark .book-card,
body.dark .book-card-list,
body.dark .intro-section {
  background: #1a1a1a;
  color: #f0f0f0;
}

body.dark .toggle-group button {
  background: #444;
  color: #eee;
}

body.dark .toggle-group button.active {
  background: #888;
}

body.dark .fav-toggle {
  background: #444;
  color: #eee;
}

body.dark .fav-toggle.active {
  background: #d32f2f;
}

body.dark .book-overlay {
  background: rgba(255,255,255,0.12);
}

body.dark .scroll-top-btn {
  background: #555;
}


/* -----------------------------------------------------
   HEADER
----------------------------------------------------- */

header {
  padding: 20px;
}

.title-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.header-logo {
  width: 52px;
  height: auto;
}

.back-link {
  text-decoration: none;
  margin-right: 8px;
  color: var(--accent-primary);
}

/* -----------------------------------------------------
   SEARCH BAR + TOGGLES
----------------------------------------------------- */

.search-block {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.search-block input[type="search"] {
  padding: 10px 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  min-width: 260px;
}

/* Updated to include filter-group select */
.genre-filter select, .filter-group select, .platform-select {
  padding: 10px;
  border-radius: 8px;
  margin-right: 10px;
  border: 1px solid #ccc; /* consistent border */
}

.toggle-group {
  display: inline-flex;
  border: 1px solid #bbb;
  border-radius: 8px;
  overflow: hidden;
}

.toggle-group button {
  padding: 8px 12px;
  background: #f7f7f7;
  border: none;
  cursor: pointer;
}

.toggle-group button.active {
  background: var(--accent-primary);
  color: white;
}

/* NEW: Shopping Platform Selector Styling */
.platform-selector {
  /* VISUAL ORDER: Ensure this stays at the very end visually */
  order: 100;
  
  /* ALIGNMENT: Push this element (and only this one) to the far right */
  margin-left: auto; 
  
  /* Styling for separation */
  padding-left: 15px; 
  border-left: 1px solid rgba(0,0,0,0.1); 
  display: flex;
  align-items: center;
}

body.dark .platform-selector {
  border-left-color: rgba(255,255,255,0.2);
}

/* -----------------------------------------------------
   NETFLIX STYLE ROWS
----------------------------------------------------- */

.genre-row {
  margin-bottom: 28px;
}

.genre-row-header {
  display: flex;
  justify-content: space-between;
  padding: 0 20px 6px;
}

.genre-scroll {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 0 20px 20px; 
  scroll-behavior: smooth;
  /* Enhanced scrolling for iOS/Touch */
  -webkit-overflow-scrolling: touch;
}

.genre-scroll.dragging {
  cursor: grabbing;
}

/* Extra spacing for rows */
.genre-row {
  margin-bottom: 32px;
}

/* Swipe hint (mobile) */
@media (max-width: 768px) {
  .genre-row-header h2::after {
    content: " · Swipe to explore →";
    font-size: 0.8rem;
    font-weight: 400;
    opacity: 0.7;
  }
  
  /* On mobile, stack the search block better */
  .search-block {
    justify-content: space-between;
  }
  .platform-selector {
    margin-left: 0; /* Reset auto margin on mobile so it flows naturally */
    border-left: none;
    padding-left: 0;
    width: 100%; /* Make it full width or naturally flowing */
    margin-top: 10px;
    order: 0; /* Reset order on mobile so it follows natural flow */
  }
}

/* Edge fade for scrollable rows */
.genre-scroll.scroll-fade {
  position: relative;
}

.genre-scroll.scroll-fade::before,
.genre-scroll.scroll-fade::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 28px;
  pointer-events: none;
  z-index: 2;
}

.genre-scroll.scroll-fade::before {
  left: 0;
  background: linear-gradient(to right, #ffffff, rgba(255, 255, 255, 0));
}

.genre-scroll.scroll-fade::after {
  right: 0;
  background: linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0));
}


/* -----------------------------------------------------
   BOOK CARDS
----------------------------------------------------- */

.book-card,
.book-card-list {
  background: white;
  border-radius: 8px;
  overflow: hidden;
  width: 160px;
  flex-shrink: 0;
  position: relative; 
  /* Cursor pointer indicates interactivity (tap/click) */
  cursor: pointer;
}

/* MODERN HOVER OVERLAY */
.book-overlay {
  position: absolute;

  /* Reveal just the lower portion of the card */
  top: 45%;
  bottom: 0;
  left: 0;
  right: 0;

  background: rgba(0, 0, 0, 0.75);
  background: var(--accent-primary); /* Use theme color for consistency */
  color: white;

  /* Using block ensures text starts at the top and scrolls correctly */
  display: block; 
  text-align: center;
  padding: 20px 15px 15px 15px; 

  opacity: 0;
  transform: translateY(10px); 
  transition: 
    opacity 0.25s ease,
    transform 0.25s ease;

  overflow-y: auto;
  backdrop-filter: blur(3px);
  pointer-events: none;

  z-index: 10;
  border-top: 1px solid rgba(255,255,255,0.2);
}

/* Hover trigger AND Active trigger (for Touch) */
.book-card:hover .book-overlay,
.book-card.active .book-overlay {
  opacity: 0.98;
  transform: translateY(0);
  pointer-events: auto;
}

.book-card img {
  width: 100%;
  height: 230px;
  object-fit: cover;
}

.book-body {
  padding: 10px;
}

.book-title {
  font-size: 0.9rem;
  margin: 0 0 4px;
}

.book-author {
  color: #666;
  font-size: 0.8rem;
}

.book-meta {
  font-size: 0.75rem;
  color: #444;
  margin-top: 4px;
}

/* List cards */
.book-card-list {
  display: flex;
  gap: 12px;
  padding: 10px;
  width: 100%;
}

.book-card-list img {
  width: 120px;
  height: 160px;
}

/* Card base + better spacing */
.book-card,
.book-card-list {
  position: relative;
}

.book-title {
  margin: 0 0 4px;
}

.book-author {
  font-size: 0.9rem;
  opacity: 0.85;
  margin-bottom: 4px;
}

.book-meta {
  font-size: 0.8rem;
  opacity: 0.75;
  margin-bottom: 6px;
}

.book-description {
  font-size: 0.9rem;
  line-height: 1.5;
  margin-top: 4px;
}

/* FIXED: Blur + fade-in on book images */
.book-card img,
.book-card-list img,
.book-modal-cover {
  /* Start visible but blurred */
  opacity: 1;
  filter: blur(8px);
  transform: scale(1.02);
  transition: opacity 0.3s ease, filter 0.3s ease, transform 0.3s ease;
}

/* When loaded class is added */
.book-card img.loaded,
.book-card-list img.loaded,
.book-modal-cover.loaded {
  opacity: 1;
  filter: blur(0);
  transform: scale(1);
}

/* Favorites heart (UPDATED with SVG and Flexbox) */
.heart-btn {
  position: absolute;
  top: 6px;
  right: 6px;

  width: 30px;
  height: 30px;

  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.95);

  /* Center SVG perfectly */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;

  font-size: 1.1rem;
  color: #ccc; /* Default grey (applied to SVG fill) */

  cursor: pointer;
  z-index: 50; /* always above overlay */

  box-shadow: 0 2px 6px rgba(0,0,0,0.18);
  transition: transform 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
}

/* SVG Styling */
.heart-btn svg {
  width: 20px;
  height: 20px;
  display: block;
  pointer-events: none;
}

/* ONLY turn red if active class is present */
.heart-btn.active {
  color: #e74c3c !important;
}

/* Heart pop animation */
@keyframes heart-pop {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.35); }
  60%  { transform: scale(0.92); }
  100% { transform: scale(1); }
}

.heart-btn.pop {
  animation: heart-pop 0.25s ease;
}

/* Hover polish */
.book-card:hover .heart-btn,
.book-card-list:hover .heart-btn {
  transform: translateY(-1px);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
}

/* Book details modal (SCROLL FIX APPLIED HERE) */
.book-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.book-modal-backdrop.hidden {
  display: none;
}

.book-modal {
  max-width: 820px;
  width: 95%;
  max-height: 85vh;
  background: #ffffff;
  border-radius: 18px;
  padding: 24px 24px 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
  position: relative;
  
  /* CHANGED: Allow vertical scrolling */
  overflow-y: auto;
  -webkit-overflow-scrolling: touch; /* Smooth scroll on iOS */
  
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* FIXED: Changed to ABSOLUTE positioning to prevent mobile overlap issues */
.book-modal-close {
  position: absolute;
  top: 15px;
  right: 15px;
  
  border: none;
  background: rgba(255,255,255,0.85); /* Semi-transparent bg for visibility */
  border-radius: 50%;
  width: 40px;
  height: 40px;
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  font-size: 1.8rem;
  line-height: 1;
  cursor: pointer;
  color: #555;
  z-index: 20; 
  padding: 0;
  /* Removed sticky and negative margins which caused the overlap */
}

.book-modal-body {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 18px;
  align-items: flex-start;
  margin-top: 25px; /* Add explicit space for the close button */
}

.book-modal-left {
  display: flex;
  justify-content: center;
  flex-direction: column; /* Stack image and buttons */
  gap: 10px;
}

.book-modal-cover {
  width: 100%;
  border-radius: 10px;
  object-fit: cover;
}

/* NEW: Action button in modal */
.book-action-btn {
  display: block;
  width: 100%;
  padding: 8px 10px;
  background: var(--accent-primary);
  color: white;
  text-align: center;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
.book-action-btn:hover {
  filter: brightness(1.2);
}

.book-modal-right {
  min-width: 0;
}

.book-modal-title {
  margin: 0 0 4px;
  font-size: 1.4rem;
  padding-right: 30px; /* Avoid overlap with close button if it wasn't sticky */
}

.book-modal-author {
  font-size: 0.95rem;
  opacity: 0.85;
  margin-bottom: 4px;
}

.book-modal-meta {
  font-size: 0.85rem;
  opacity: 0.75;
  margin-bottom: 8px;
}

.book-modal-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.book-modal-description {
  font-size: 0.95rem;
  line-height: 1.6;
}

.book-modal-more {
  margin-top: 6px;
}

.book-modal-more h3 {
  font-size: 0.95rem;
  margin: 0 0 6px;
}

.book-modal-more-row {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.more-like-card {
  border: none;
  background: #f5f5f5;
  border-radius: 10px;
  padding: 6px 6px 8px;
  min-width: 120px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  cursor: pointer;
}

.more-like-card img {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 4px;
}

.more-like-card span {
  font-size: 0.8rem;
  text-align: left;
}

/* prevent background scroll when modal open */
body.modal-open {
  overflow: hidden;
}

@media (max-width: 640px) {
  .book-modal {
    padding: 18px 16px 16px;
  }

  .book-modal-body {
    grid-template-columns: 1fr;
  }

  .book-modal-left {
    max-width: 150px;
    margin: 0 auto;
  }
}

/* Scroll-to-top floating button */
.scroll-top-btn {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--accent-primary, #4a90e2);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.28);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 900;
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* Favorites filter toggle */
/* Favorites button styled like toggle buttons */
.fav-toggle {
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid #bbb;
  background: #f7f7f7;
  cursor: pointer;
  font-size: 0.85rem;
  color: #333;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

/* Active state = matches accent style */
.fav-toggle.active {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}


/* Favorites empty state */
.favorites-empty {
  padding: 40px;
  font-size: 1.1rem;
  opacity: 0.75;
  text-align: center;
}

/* -----------------------------------------------------
   EXPORT BUTTON
----------------------------------------------------- */
#exportFavoritesBtn {
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid #4CAF50;
  background: #f0f9f0;
  color: #2E7D32;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

#exportFavoritesBtn:hover {
  background: #4CAF50;
  color: white;
  transform: translateY(-1px);
}

#exportFavoritesBtn.exporting {
  background: #4CAF50;
  color: white;
  border-color: #2E7D32;
}

body.dark #exportFavoritesBtn {
  background: #1a3d1a;
  border-color: #4CAF50;
  color: #a5d6a7;
}

body.dark #exportFavoritesBtn:hover {
  background: #4CAF50;
  color: #0f0f0f;
}

/* -----------------------------------------------------
   PILLS
----------------------------------------------------- */

/* Genre pills */
.pill-genre {
  background: var(--accent-pill-bg);
  color: var(--accent-pill-text);
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 0.68rem;
  margin: 2px;
  display: inline-block;
}

/* Reading level pills (Explorer/Adventurer…) */
.pill-level {
  background: #fff4d9;
  border: 1px solid #e4c995;
  color: #946600;
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 0.68rem;
  font-weight: 600;
  margin: 2px;
  display: inline-block;
}
/* Age / grade band pills (PD) */
.pill-age {
  background: #ffe5c2;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 0.68rem;
  margin: 2px;
  display: inline-block;
  color: #9a4a00;
  font-weight: 600;
}


/* -----------------------------------------------------
   GRID / LIST
----------------------------------------------------- */

/* UPDATED: Add padding to the container section for All Books view */
#gridListSection {
  padding: 0 20px 40px;
}

#gridListContainer.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

#gridListContainer.list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 16px;
}

/* -----------------------------------------------------
   EMPTY STATE
----------------------------------------------------- */

.no-results {
  padding: 40px;
  text-align: center;
  font-size: 1.1rem;
  opacity: 0.7;
}

/* -----------------------------------------------------
   COMING SOON BANNER
----------------------------------------------------- */

.coming-soon-banner {
  background: #fff4f4;
  border: 1px solid #e5a7a7;
  padding: 14px 18px;
  border-radius: 12px;
  color: #b30000;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

/* -----------------------------------------------------
   INTRO / READING LEVEL SECTION (New)
----------------------------------------------------- */

.intro-section {
  background: white;
  padding: 30px;
  border-radius: 8px;
  margin: 0 20px 30px 20px; /* Aligned with rows */
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.intro-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  margin-bottom: 10px;
}

.intro-content h2 {
  color: var(--accent-primary);
  margin-top: 0;
}

.intro-content p {
  line-height: 1.6;
  color: #555;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.level-card {
  background: #f9fbfd;
  padding: 20px;
  border-radius: 10px;
  border: 1px solid #e1e8ed;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.level-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  background: white;
  border-color: var(--accent-primary);
}

.level-card h3 {
  margin-top: 0;
  color: var(--accent-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.level-card p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.5;
  margin: 0;
}



/* Color coding the top borders of level cards */
.level-card[data-level="Explorer"] { border-top: 4px solid #4CAF50; }
.level-card[data-level="Adventurer"] { border-top: 4px solid #FFC107; }
.level-card[data-level="Voyager"] { border-top: 4px solid #FF9800; }
.level-card[data-level="Galactic"] { border-top: 4px solid #F44336; }

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