/* ===== CSS Variables & Color System ===== */
:root {
  --primary-50: #E8F0FE;
  --primary-100: #D0E0FD;
  --primary-200: #A8C7FB;
  --primary-300: #7AAEF9;
  --primary-400: #4A95F7;
  --primary-500: #1a73e8;
  --primary-600: #1557B0;
  --primary-700: #11448C;
  --primary-800: #0D3268;
  --primary-900: #092044;

  --secondary-400: #34A853;
  --secondary-500: #2D9148;
  --secondary-600: #267A3D;

  --accent-400: #FBBC04;
  --accent-500: #F9A004;

  --neutral-0: #FFFFFF;
  --neutral-50: #F8F9FA;
  --neutral-100: #F1F3F5;
  --neutral-200: #E2E6EA;
  --neutral-300: #CDD3DA;
  --neutral-400: #98A2B3;
  --neutral-500: #667085;
  --neutral-600: #475467;
  --neutral-700: #344054;
  --neutral-800: #1D2939;
  --neutral-900: #0F172A;

  --success: #34A853;
  --warning: #FBBC04;
  --error: #EA4335;

  --font-body: 'Noto Sans TC', -apple-system, system-ui, sans-serif;
  --font-heading: 'Noto Serif TC', Georgia, serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.15);

  --t-fast: 0.2s ease;
  --t-base: 0.3s ease;
  --t-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-700);
  background-color: var(--neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }

a {
  color: var(--primary-600);
  text-decoration: none;
  transition: color var(--t-fast);
}
a:hover { color: var(--primary-700); }

ul { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
  color: var(--neutral-800);
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-body);
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--t-base);
  text-align: center;
}

.btn-primary {
  background: var(--primary-500);
  color: var(--neutral-0);
  border: none;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--primary-600);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(26,115,232,0.35);
  color: var(--neutral-0);
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--t-base);
}

.navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary-600);
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--primary-700); }

.logo-icon { font-size: 1.4rem; }

.nav-search {
  flex: 1;
  max-width: 480px;
  position: relative;
}

.nav-search input {
  width: 100%;
  padding: 0.55rem 2.5rem 0.55rem 1rem;
  border: 1.5px solid var(--neutral-200);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-family: var(--font-body);
  background: var(--neutral-50);
  transition: all var(--t-fast);
}

.nav-search input:focus {
  outline: none;
  border-color: var(--primary-400);
  background: var(--neutral-0);
  box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.search-icon {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  opacity: 0.5;
  pointer-events: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--neutral-700);
  border-radius: 2px;
  transition: all var(--t-base);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
  color: var(--neutral-0);
  padding: 5rem 1rem 3rem;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(255,255,255,0.1), transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  animation: heroFadeIn 0.8s ease forwards;
}

.hero-title {
  font-size: 2.75rem;
  color: var(--neutral-0);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 2rem;
  font-weight: 400;
}

.hero-search {
  display: flex;
  gap: 0.5rem;
  max-width: 560px;
  margin: 0 auto 2rem;
}

.hero-search input {
  flex: 1;
  padding: 0.75rem 1.2rem;
  border: none;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-family: var(--font-body);
  background: rgba(255,255,255,0.95);
  transition: all var(--t-fast);
}

.hero-search input:focus {
  outline: none;
  background: var(--neutral-0);
  box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  justify-content: center;
}

.hero-stat {
  text-align: center;
}

.hero-stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-400);
}

.hero-stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Filter Bar ===== */
.filter-bar {
  position: sticky;
  top: 64px;
  z-index: 900;
  background: var(--neutral-0);
  border-bottom: 1px solid var(--neutral-200);
  padding: 0.75rem 0;
  box-shadow: var(--shadow-sm);
}

.filter-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding: 2px 0;
}

.filter-scroll::-webkit-scrollbar { height: 4px; }
.filter-scroll::-webkit-scrollbar-thumb { background: var(--neutral-300); border-radius: 2px; }

.filter-chip {
  padding: 0.4rem 1rem;
  border: 1.5px solid var(--neutral-200);
  border-radius: var(--radius-full);
  background: var(--neutral-0);
  color: var(--neutral-600);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t-fast);
  flex-shrink: 0;
}

.filter-chip:hover {
  border-color: var(--primary-300);
  color: var(--primary-600);
}

.filter-chip.active {
  background: var(--primary-500);
  border-color: var(--primary-500);
  color: var(--neutral-0);
}

/* ===== Main Content ===== */
.main-content {
  padding: 2rem 0 3rem;
}

.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.content-header h2 {
  font-size: 1.5rem;
}

.result-count {
  font-size: 0.9rem;
  color: var(--neutral-500);
}

/* ===== Store Grid ===== */
.store-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.loading-message {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 0;
  color: var(--neutral-400);
  font-size: 1rem;
}

/* ===== Store Card ===== */
.store-card {
  background: var(--neutral-0);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--t-base);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.store-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.store-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  border-bottom: 1px solid var(--neutral-100);
}

.store-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--neutral-0);
  flex-shrink: 0;
}

.store-card-info {
  flex: 1;
  min-width: 0;
}

.store-name {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--neutral-800);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}

.store-category-tag {
  display: inline-block;
  font-size: 0.72rem;
  color: var(--primary-600);
  background: var(--primary-50);
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-top: 0.25rem;
}

.store-card-body {
  padding: 0.75rem 1rem;
  flex: 1;
}

.store-desc {
  font-size: 0.82rem;
  color: var(--neutral-500);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.store-meta {
  font-size: 0.8rem;
  color: var(--neutral-600);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.store-meta + .store-meta { margin-top: 0.2rem; }

.store-card-footer {
  padding: 0.5rem 1rem 1rem;
  display: flex;
  gap: 0.5rem;
}

.store-social-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-0);
  font-size: 0.75rem;
  font-weight: 700;
  transition: all var(--t-fast);
  flex-shrink: 0;
}

.store-social-btn:hover {
  transform: scale(1.1);
  color: var(--neutral-0);
}

.social-btn-line { background: #06C755; }
.social-btn-fb { background: #1877F2; }
.social-btn-ig { background: linear-gradient(45deg, #F09433, #DC2743, #BC1888); }
.social-btn-web { background: var(--neutral-600); }

/* ===== Pagination ===== */
.pagination {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.page-btn {
  min-width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--neutral-200);
  background: var(--neutral-0);
  color: var(--neutral-600);
  font-size: 0.9rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--t-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.5rem;
}

.page-btn:hover:not(:disabled) {
  border-color: var(--primary-300);
  color: var(--primary-600);
}

.page-btn.active {
  background: var(--primary-500);
  border-color: var(--primary-500);
  color: var(--neutral-0);
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-ellipsis {
  display: flex;
  align-items: center;
  padding: 0 0.3rem;
  color: var(--neutral-400);
}

/* ===== No Results ===== */
.no-results {
  text-align: center;
  padding: 3rem 1rem;
}

.no-results-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
}

.no-results p {
  font-size: 1.1rem;
  color: var(--neutral-600);
}

.no-results-hint {
  font-size: 0.9rem !important;
  color: var(--neutral-400) !important;
  margin-top: 0.5rem;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.6);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--neutral-0);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.9);
  transition: transform var(--t-base);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 36px;
  height: 36px;
  border: none;
  background: var(--neutral-100);
  border-radius: 50%;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  color: var(--neutral-500);
  transition: all var(--t-fast);
  z-index: 1;
}

.modal-close:hover {
  background: var(--neutral-200);
  color: var(--neutral-800);
}

.modal-body { padding: 0; }

.modal-header {
  padding: 2rem 1.5rem 1.5rem;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-50), var(--neutral-50));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-logo {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--neutral-0);
  margin: 0 auto 1rem;
}

.modal-name {
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
}

.modal-category {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--primary-600);
  background: var(--primary-50);
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-full);
}

.modal-rating {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--accent-500);
}

.modal-info {
  padding: 1.5rem;
}

.modal-info-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--neutral-100);
}

.modal-info-item:last-child { border-bottom: none; }

.modal-info-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 28px;
  text-align: center;
}

.modal-info-label {
  font-size: 0.78rem;
  color: var(--neutral-400);
  display: block;
}

.modal-info-value {
  font-size: 0.92rem;
  color: var(--neutral-700);
  word-break: break-all;
}

.modal-info-value a {
  color: var(--primary-600);
}

.modal-social {
  padding: 0 1.5rem 1.5rem;
  display: flex;
  gap: 0.6rem;
  justify-content: center;
}

.modal-social-btn {
  flex: 1;
  padding: 0.6rem;
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--neutral-0);
  font-size: 0.82rem;
  font-weight: 500;
  transition: all var(--t-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}

.modal-social-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: var(--neutral-0);
}

/* ===== Footer ===== */
.footer {
  background: var(--neutral-900);
  color: var(--neutral-400);
  padding: 2.5rem 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.footer-brand h3 {
  color: var(--neutral-0);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 450px;
}

.footer-info h4 {
  color: var(--neutral-200);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.footer-info p {
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.82rem;
}

/* ===== Floating Tools ===== */
.floating-tools {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.social-quick-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  opacity: 0;
  transform: translateY(20px) scale(0.8);
  pointer-events: none;
  transition: all var(--t-base);
}

.social-quick-links.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.social-link {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-0);
  box-shadow: var(--shadow-md);
  transition: all var(--t-base);
  position: relative;
}

.social-link:hover {
  transform: scale(1.15);
  color: var(--neutral-0);
}

.social-line { background: #06C755; }
.social-fb { background: #1877F2; }
.social-ig { background: linear-gradient(45deg, #F09433, #E6683C, #DC2743, #CC2366, #BC1888); }

.social-link::after {
  content: attr(aria-label);
  position: absolute;
  right: 54px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--neutral-800);
  color: var(--neutral-0);
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-fast);
}

.social-link:hover::after { opacity: 1; }

.back-to-top {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary-500);
  color: var(--neutral-0);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(26,115,232,0.4);
  transition: all var(--t-base);
  opacity: 0;
  pointer-events: none;
}

.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  transform: translateY(-3px);
  background: var(--primary-600);
  box-shadow: 0 6px 20px rgba(26,115,232,0.5);
}

/* ===== Fade-in Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 1024px) {
  .store-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-title { font-size: 2.25rem; }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
  .nav-search { display: none; }

  .nav-toggle { display: flex; }

  .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

  .hero {
    min-height: 360px;
    padding-top: 5rem;
  }

  .hero-title { font-size: 1.875rem; }
  .hero-subtitle { font-size: 1rem; }

  .hero-search {
    flex-direction: column;
  }

  .hero-search .btn { width: 100%; }

  .hero-stats {
    gap: 1.5rem;
  }

  .hero-stat-num { font-size: 1.5rem; }

  .store-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .content-header h2 { font-size: 1.25rem; }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .floating-tools {
    bottom: 16px;
    right: 16px;
  }

  .filter-bar { top: 64px; }
}

/* ===== Responsive: Small Mobile ===== */
@media (max-width: 480px) {
  .store-grid {
    grid-template-columns: 1fr;
  }

  .hero-title { font-size: 1.5rem; }
  .hero-stats { gap: 1rem; }
  .hero-stat-num { font-size: 1.25rem; }

  .modal-social {
    flex-wrap: wrap;
  }

  .modal-social-btn {
    flex: 1 1 45%;
  }
}