/* TecTokLab mobile-first rewrite */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --background: #ffffff;
  --foreground: #0a0a0a;
  --card: #ffffff;
  --primary: #0ea5e9;
  --primary-foreground: #ffffff;
  --muted: #f4f4f5;
  --muted-foreground: #71717a;
  --border: #e4e4e7;
  --radius: 0.5rem;
  --mobile-header-height: 56px;
  --mobile-tabs-height: 50px;
  --mobile-bottom-height: 68px;
}

[data-theme="dark"] {
  --background: #0a0a0a;
  --foreground: #fafafa;
  --card: #18181b;
  --primary: #38bdf8;
  --primary-foreground: #0c4a6e;
  --muted: #27272a;
  --muted-foreground: #a1a1aa;
  --border: #3f3f46;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--background);
  color: var(--foreground);
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { border: 0; background: none; font: inherit; color: inherit; cursor: pointer; }

.app-container { min-height: 100dvh; }
.sidebar,
.main-header { display: none; }

.icon-btn {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius);
  background: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mobile-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--background);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem;
}
.mobile-header-content { display: flex; align-items: center; justify-content: space-between; }
.mobile-logo { display: flex; align-items: center; gap: 0.5rem; }
.mobile-logo-icon {
  width: 2rem; height: 2rem; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), #06b6d4);
  color: #fff; display: inline-flex; align-items: center; justify-content: center; font-weight: 700;
}
.mobile-logo-text { font-size: 1rem; font-weight: 700; }
.mobile-actions { display: flex; gap: 0.25rem; }

.mobile-category-tabs {
  position: sticky;
  top: var(--mobile-header-height);
  z-index: 35;
  white-space: nowrap;
  overflow-x: auto;
  padding: 0.5rem 1rem;
  background: var(--background);
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}
.mobile-category-tabs::-webkit-scrollbar { display: none; }
.mobile-tab {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.85rem;
  margin-right: 0.5rem;
  border-radius: 999px;
  font-size: 0.875rem;
  color: var(--muted-foreground);
  background: var(--muted);
}
.mobile-tab.active { background: var(--primary); color: var(--primary-foreground); }

.main-content { width: 100%; margin: 0; }
.main-scroll {
  width: 100%;
  max-width: 100%;
  padding: 1rem;
  padding-bottom: calc(var(--mobile-bottom-height) + env(safe-area-inset-bottom, 0px) + 1rem);
}

.category-section { margin-bottom: 2rem; }
.category-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding-bottom: 0.65rem; margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.category-icon { width: 1.25rem; height: 1.25rem; color: var(--primary); }
.category-title { font-size: 1.125rem; font-weight: 700; }
.subcategory-section { margin-bottom: 1.5rem; }
.subcategory-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; }
.subcategory-icon { width: 1rem; height: 1rem; color: var(--muted-foreground); }
.subcategory-title { font-size: 0.95rem; color: var(--muted-foreground); }

.tool-grid { display: grid; grid-template-columns: 1fr; gap: 0.9rem; }
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.tool-card-header { display: flex; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.5rem; }
.tool-name { font-size: 1.15rem; font-weight: 700; overflow-wrap: anywhere; }
.favorite-btn { width: 2rem; height: 2rem; border-radius: 999px; color: var(--muted-foreground); }
.favorite-btn.active { color: #ef4444; }
.favorite-btn.active svg { fill: #ef4444; }

.tool-description {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  margin-bottom: 0.6rem;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}
.tool-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.75rem; }
.tool-tag {
  padding: 0.125rem 0.45rem; border-radius: 999px;
  font-size: 0.75rem; background: var(--muted);
}
.tool-footer { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.tool-rating { display: flex; gap: 0.125rem; }
.star-btn { color: var(--muted-foreground); }
.star-btn.active { color: #facc15; }
.star-btn.active svg { fill: #facc15; }
.visit-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--primary-foreground);
  font-weight: 600;
}

.mobile-bottom-nav {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 40;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 0.35rem 0 0.35rem;
  padding-bottom: env(safe-area-inset-bottom, 0.35rem);
}
.mobile-nav-items { display: flex; justify-content: space-around; }
.mobile-nav-item {
  display: flex; flex-direction: column; align-items: center; gap: 0.2rem;
  color: var(--muted-foreground); font-size: 0.75rem;
}
.mobile-nav-item.active { color: var(--primary); }
.mobile-nav-item svg { width: 1.2rem; height: 1.2rem; }

.search-modal,
.favorites-drawer { display: none; position: fixed; inset: 0; z-index: 100; }
.search-modal.open,
.favorites-drawer.open { display: block; }
.search-modal { background: rgb(0 0 0 / 0.5); padding: 0.5rem; padding-top: 8vh; }
.search-modal-content {
  max-width: 600px;
  margin: 0 auto;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.search-modal-header { display: flex; align-items: center; padding: 1rem; border-bottom: 1px solid var(--border); }
.search-modal-input { flex: 1; border: 0; background: transparent; color: var(--foreground); outline: 0; }
.search-modal-results { max-height: 60vh; overflow-y: auto; }
.search-result-item { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.75rem 1rem; }
.search-empty { padding: 2rem; text-align: center; color: var(--muted-foreground); }

.favorites-overlay { position: absolute; inset: 0; background: rgb(0 0 0 / 0.5); }
.favorites-panel {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.favorites-header { display: flex; align-items: center; justify-content: space-between; padding: 1rem; border-bottom: 1px solid var(--border); }
.favorites-title { font-size: 1.125rem; font-weight: 700; }
.favorites-list { flex: 1; overflow-y: auto; padding: 1rem; }
.favorites-empty { color: var(--muted-foreground); text-align: center; padding: 2rem 1rem; }
.favorite-item { display: flex; justify-content: space-between; gap: 0.75rem; padding: 0.75rem; border-radius: var(--radius); }
.favorite-item-actions { display: flex; gap: 0.35rem; }

.settings-panel { display: none; padding: 1rem; }
.settings-panel.active { display: block; }
.settings-section { margin-bottom: 1.5rem; }
.settings-section h3 { margin-bottom: 0.75rem; font-size: 1rem; }
.theme-options { display: flex; gap: 0.75rem; }
.theme-btn {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}
.theme-btn.active { background: var(--primary); color: var(--primary-foreground); border-color: var(--primary); }

@media (min-width: 1025px) {
  .app-container { display: flex; }
  .mobile-header, .mobile-category-tabs, .mobile-bottom-nav { display: none; }
  .sidebar {
    display: flex;
    position: fixed;
    left: 0; top: 0;
    width: 280px; height: 100vh;
    background: var(--card);
    border-right: 1px solid var(--border);
    flex-direction: column;
    z-index: 30;
  }
  .sidebar-header { padding: 1.5rem; border-bottom: 1px solid var(--border); }
  .logo { display: flex; gap: 0.75rem; align-items: center; }
  .logo-icon {
    width: 2.5rem; height: 2.5rem;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), #06b6d4);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
  }
  .logo-text h1 { font-size: 1.125rem; }
  .logo-text p { font-size: 0.75rem; color: var(--muted-foreground); }
  .sidebar-nav { flex: 1; overflow-y: auto; padding: 1rem 0; }
  .sidebar-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--border); display: flex; gap: 0.5rem; }
  .nav-category-btn { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 1.5rem; }
  .nav-category-btn .icon { width: 1.25rem; height: 1.25rem; margin-right: 0.75rem; }
  .chevron { width: 1rem; height: 1rem; transition: transform 0.2s; }
  .nav-category.open .chevron { transform: rotate(180deg); }
  .nav-subcategories { display: none; padding-left: 2.5rem; }
  .nav-category.open .nav-subcategories { display: block; }
  .nav-subcategory { display: flex; align-items: center; gap: 0.5rem; padding: 0.45rem 1rem; color: var(--muted-foreground); }

  .main-content { margin-left: 280px; width: calc(100% - 280px); min-height: 100vh; }
  .main-header {
    display: flex;
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--background);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    align-items: center;
    justify-content: space-between;
  }
  .search-box { flex: 1; max-width: 420px; }
  .search-wrapper { position: relative; }
  .search-icon { position: absolute; left: 0.75rem; top: 50%; transform: translateY(-50%); width: 1rem; height: 1rem; color: var(--muted-foreground); }
  .search-input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.625rem 0.75rem 0.625rem 2.35rem;
    background: var(--background);
    color: var(--foreground);
  }
  .main-scroll { padding: 2rem; max-width: 1400px; margin: 0 auto; }
  .category-title { font-size: 1.5rem; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}