@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@500;700;800&family=Noto+Sans+TC:wght@400;500;700&display=swap');

:root {
  --bs-body-bg: #f8fafc;
  --bs-body-bg-rgb: 248, 250, 252;
  --bs-card-bg: #ffffff;
  --bs-card-bg-rgb: 255, 255, 255;
  --navbar-bg: rgba(248, 250, 252, 0.8);
  --hero-surface: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(241, 247, 255, 0.95));
  --hero-badge-bg: rgba(13, 110, 253, 0.08);
  --hero-badge-border: rgba(13, 110, 253, 0.18);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 40px -28px rgba(15, 23, 42, 0.4);
  --transition: all 0.3s ease;
}

[data-bs-theme="dark"] {
  --bs-body-bg: #0f172a;
  --bs-body-bg-rgb: 15, 23, 42;
  --bs-card-bg: #1e293b;
  --bs-card-bg-rgb: 30, 41, 59;
  --navbar-bg: rgba(15, 23, 42, 0.8);
  --hero-surface: linear-gradient(145deg, rgba(30, 41, 59, 0.94), rgba(15, 23, 42, 0.96));
  --hero-badge-bg: rgba(96, 165, 250, 0.12);
  --hero-badge-border: rgba(147, 197, 253, 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --bs-border-color: #334155;
}

body {
  font-family: 'Noto Sans TC', 'Nunito', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at 10% -10%, rgba(56, 189, 248, 0.18), transparent 35%),
    radial-gradient(circle at 95% 8%, rgba(13, 110, 253, 0.14), transparent 30%),
    linear-gradient(180deg, rgba(var(--bs-body-bg-rgb), 1) 0%, rgba(var(--bs-body-bg-rgb), 0.96) 100%);
}

/* Theme Toggle Button */
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--bs-body-color);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  cursor: pointer;
}

.theme-toggle:hover {
  background-color: var(--bs-secondary-bg);
}

.theme-toggle.is-off {
  opacity: 0.72;
}

.theme-toggle:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--bs-primary) 65%, white);
  outline-offset: 2px;
}

.sound-status-toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 1080;
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bs-card-bg, #fff) 90%, rgba(13, 110, 253, 0.08));
  color: var(--bs-body-color);
  border: 1px solid color-mix(in srgb, var(--bs-primary) 24%, var(--bs-border-color, #dee2e6));
  box-shadow: 0 1rem 2rem rgba(15, 23, 42, 0.12);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.sound-status-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 767.98px) {
  .sound-status-toast {
    left: 1rem;
    right: 1rem;
    text-align: center;
    border-radius: 1rem;
  }
}

.home-main {
  position: relative;
  z-index: 1;
}

.hero-shell {
  position: relative;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--bs-border-color, #dee2e6) 72%, transparent);
  border-radius: 1.5rem;
  padding: clamp(1.5rem, 2.8vw, 2.6rem);
  background: var(--hero-surface);
  box-shadow: var(--shadow-lg);
}

.hero-ambient {
  position: absolute;
  border-radius: 999px;
  filter: blur(4px);
  pointer-events: none;
  opacity: 0.8;
}

.hero-ambient-a {
  width: 220px;
  height: 220px;
  background: rgba(56, 189, 248, 0.25);
  top: -95px;
  right: -80px;
}

.hero-ambient-b {
  width: 180px;
  height: 180px;
  background: rgba(13, 110, 253, 0.2);
  bottom: -90px;
  left: -65px;
}

.hero-shell > * {
  position: relative;
  z-index: 1;
}

.hero-badges {
  margin: 1.2rem auto 0;
  max-width: 960px;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--hero-badge-border);
  background: var(--hero-badge-bg);
  color: inherit;
  text-decoration: none;
  font-size: 0.92rem;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.hero-badge:hover {
  transform: translateY(-2px);
  border-color: rgba(13, 110, 253, 0.45);
  background: color-mix(in srgb, var(--hero-badge-bg) 72%, rgba(13, 110, 253, 0.15));
}

.home-category-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
}

.home-category-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.25rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--bs-border-color, #dee2e6) 84%, rgba(13, 110, 253, 0.12));
  background: color-mix(in srgb, var(--bs-card-bg, #fff) 92%, rgba(13, 110, 253, 0.03));
  color: var(--bs-body-color);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  box-shadow: 0 0.45rem 0.9rem rgba(15, 23, 42, 0.07);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.home-category-pill:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--bs-primary) 40%, var(--bs-border-color, #dee2e6));
  background: color-mix(in srgb, var(--bs-primary) 14%, var(--bs-card-bg, #fff));
  color: var(--bs-primary);
}

.home-category-pill.is-active {
  color: #fff;
  border-color: color-mix(in srgb, var(--bs-primary) 80%, #0d6efd);
  background: linear-gradient(135deg, color-mix(in srgb, var(--bs-primary) 78%, #0d6efd), color-mix(in srgb, var(--bs-primary) 58%, #2563eb));
  box-shadow: 0 0.65rem 1.4rem rgba(13, 110, 253, 0.3);
}

.home-category-pill:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--bs-primary) 72%, white);
  outline-offset: 2px;
}

[data-bs-theme="dark"] .home-category-pill {
  border-color: color-mix(in srgb, var(--bs-border-color, #334155) 85%, rgba(96, 165, 250, 0.2));
  background: color-mix(in srgb, var(--bs-card-bg, #1e293b) 88%, rgba(96, 165, 250, 0.09));
  box-shadow: 0 0.65rem 1.2rem rgba(2, 6, 23, 0.4);
}

[data-bs-theme="dark"] .home-category-pill:hover {
  background: color-mix(in srgb, rgba(96, 165, 250, 0.16) 88%, var(--bs-card-bg, #1e293b));
  color: #bfdbfe;
}

[data-bs-theme="dark"] .home-category-pill.is-active {
  color: #eff6ff;
  border-color: rgba(147, 197, 253, 0.78);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.8), rgba(14, 116, 144, 0.8));
}

/* Tool Grid components */
.tool-card {
  text-decoration: none;
  transition: var(--transition);
  height: 100%;
  border-radius: 1rem;
  position: relative;
  overflow: hidden;
  animation: card-rise 0.45s ease both;
}

.tool-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.6s ease;
  pointer-events: none;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md) !important;
  border-color: var(--bs-primary) !important;
}

.tool-card:hover::after {
  transform: translateX(120%);
}

.tool-icon {
  width: 56px;
  height: 56px;
  background-color: rgba(13, 110, 253, 0.1);
  color: var(--bs-primary);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

[data-bs-theme="dark"] .tool-icon {
    background-color: rgba(13, 110, 253, 0.2);
}

.tool-card:hover .tool-icon {
  background-color: var(--bs-primary);
  color: white;
}

.row.g-4 > [class*='col-']:nth-child(3n + 1) .tool-card {
  animation-delay: 0.03s;
}

.row.g-4 > [class*='col-']:nth-child(3n + 2) .tool-card {
  animation-delay: 0.08s;
}

.row.g-4 > [class*='col-']:nth-child(3n + 3) .tool-card {
  animation-delay: 0.13s;
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 767.98px) {
  .hero-shell {
    border-radius: 1.15rem;
    padding: 1.2rem;
  }

  .hero-badge {
    font-size: 0.86rem;
    padding: 0.4rem 0.78rem;
  }

  .home-category-nav {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.25rem;
    -webkit-overflow-scrolling: touch;
  }

  .home-category-pill {
    white-space: nowrap;
    flex: 0 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tool-card,
  .hero-badge,
  .tool-card::after {
    animation: none !important;
    transition: none !important;
  }
}

.ad-section {
  margin: 2rem 0 2.5rem;
}

.ad-section--compact {
  margin: 1.5rem 0 2rem;
}

.ad-section--wide {
  margin: 2.5rem auto;
  max-width: 960px;
}

.ad-unit {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem;
  border: 1px solid color-mix(in srgb, var(--bs-border-color, #dee2e6) 75%, transparent);
  border-radius: 1rem;
  background-color: color-mix(in srgb, var(--bs-card-bg, #fff) 92%, transparent);
  box-shadow: 0 0.5rem 1.25rem rgba(15, 23, 42, 0.06);
  overflow: hidden;
}

.ad-unit--narrow {
  max-width: 600px;
}

.ad-unit--embedded {
  max-width: 100%;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.tool-ad-card {
  border-color: color-mix(in srgb, var(--bs-primary) 18%, var(--bs-border-color, #dee2e6)) !important;
  background:
    radial-gradient(circle at top right, rgba(13, 110, 253, 0.12), transparent 42%),
    linear-gradient(180deg, color-mix(in srgb, var(--bs-card-bg, #fff) 96%, #eef5ff) 0%, var(--bs-card-bg, #fff) 100%);
}

.tool-ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 220px;
  max-height: 220px;
  overflow: hidden;
}

.tool-ad-slot .adsbygoogle {
  width: 100%;
}

[data-bs-theme="dark"] .tool-ad-card {
  border-color: color-mix(in srgb, var(--bs-primary) 28%, var(--bs-border-color, #334155)) !important;
  background:
    radial-gradient(circle at top right, rgba(96, 165, 250, 0.18), transparent 46%),
    linear-gradient(180deg, color-mix(in srgb, var(--bs-card-bg, #1e293b) 94%, #0f172a) 0%, var(--bs-card-bg, #1e293b) 100%);
}

[data-bs-theme="dark"] .ad-unit {
  box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.2);
}

/* Image Upload Area */
.image-upload-area {
  border: 2px dashed var(--bs-border-color);
  border-radius: var(--bs-border-radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background-color: var(--bs-tertiary-bg);
  min-height: 300px;
  position: relative;
  overflow: hidden;
  width: 100%;
}

.image-upload-area:hover {
  border-color: var(--bs-primary);
  background-color: rgba(13, 110, 253, 0.05);
}

[data-bs-theme="dark"] .image-upload-area:hover {
  background-color: rgba(13, 110, 253, 0.1);
}

.image-preview {
  max-width: 100%;
  max-height: 100%;
  border-radius: var(--bs-border-radius);
  object-fit: contain;
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  margin: auto;
  padding: 0.5rem;
  display: none;
}

.textarea-mono {
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.markdown-editor {
  min-height: 28rem;
  resize: vertical;
}

.markdown-preview-area {
  min-height: 28rem;
  padding: 1.25rem;
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius-lg);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bs-card-bg, #fff) 98%, #f5f9ff) 0%, var(--bs-card-bg, #fff) 100%);
  overflow: auto;
}

.markdown-preview-empty {
  display: flex;
  min-height: 100%;
  align-items: center;
  justify-content: center;
  color: var(--bs-secondary-color);
  text-align: center;
}

.markdown-preview-area > :last-child {
  margin-bottom: 0;
}

.markdown-preview-area h1,
.markdown-preview-area h2,
.markdown-preview-area h3,
.markdown-preview-area h4,
.markdown-preview-area h5,
.markdown-preview-area h6 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.markdown-preview-area h1:first-child,
.markdown-preview-area h2:first-child,
.markdown-preview-area h3:first-child {
  margin-top: 0;
}

.markdown-preview-area p,
.markdown-preview-area ul,
.markdown-preview-area ol,
.markdown-preview-area blockquote,
.markdown-preview-area pre,
.markdown-preview-area table {
  margin-bottom: 1rem;
}

.markdown-preview-area code {
  padding: 0.15rem 0.4rem;
  border-radius: 0.4rem;
  background-color: color-mix(in srgb, var(--bs-primary) 10%, transparent);
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 0.925em;
}

.markdown-preview-area pre {
  padding: 1rem;
  border-radius: 0.85rem;
  background-color: color-mix(in srgb, var(--bs-body-bg, #f8fafc) 90%, #0f172a 10%);
}

.markdown-preview-area pre code {
  padding: 0;
  background: transparent;
}

.markdown-preview-area blockquote {
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--bs-primary);
  background-color: color-mix(in srgb, var(--bs-primary) 7%, transparent);
  border-radius: 0 0.75rem 0.75rem 0;
}

.markdown-preview-area table {
  width: 100%;
  border-collapse: collapse;
}

.markdown-preview-area th,
.markdown-preview-area td {
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--bs-border-color);
}

.markdown-preview-area thead th {
  background-color: color-mix(in srgb, var(--bs-primary) 10%, transparent);
}

.markdown-preview-area img {
  max-width: 100%;
  height: auto;
  border-radius: 0.75rem;
}

[data-bs-theme="dark"] .markdown-preview-area {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bs-card-bg, #1e293b) 96%, #0f172a) 0%, var(--bs-card-bg, #1e293b) 100%);
}

/* Custom Checkbox */
.custom-checkbox {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.custom-checkbox input {
    display: none;
}

.checkmark {
    width: 24px;
    height: 24px;
    background-color: var(--bs-tertiary-bg);
    border: 2px solid var(--bs-border-color);
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    margin-right: 0.5rem;
}

.custom-checkbox input:checked + .checkmark {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
}

.custom-checkbox input:checked + .checkmark::after {
    content: '\2714'; /* Checkmark unicode */
    color: white;
    font-size: 16px;
}

@media (max-width: 576px) {
  .ad-section {
    margin: 1.5rem 0 2rem;
  }

  .markdown-editor,
  .markdown-preview-area {
    min-height: 22rem;
  }

  .ad-unit {
    padding: 0.75rem;
    border-radius: 0.875rem;
  }

  .tool-ad-slot {
    height: 180px;
    max-height: 180px;
  }
}

/* =============================================
   Related Knowledge — Tool Tab List (.rk-*)
   ============================================= */

.rk-list {
    display: flex;
    flex-direction: column;
}

.rk-item {
    display: flex;
    align-items: stretch;
    gap: 0.85rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--bs-border-color);
    transition: background 0.18s ease;
    border-radius: 8px;
    margin: 0 -0.5rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

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

.rk-item:hover {
    background: var(--bs-tertiary-bg);
    text-decoration: none;
}

/* 左側漸層示意圖 */
.rk-thumb {
    width: 72px;
    min-width: 72px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    align-self: stretch;
    min-height: 72px;
}

.rk-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.1);
}

.rk-thumb-icon {
    font-size: 1.65rem;
    color: rgba(255, 255, 255, 0.93);
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.28));
}

/* 右側文案區 */
.rk-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 0.25rem;
}

.rk-content-top {
    flex: 1;
}

.rk-item-title {
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.4;
    margin: 0 0 0.2rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.rk-item-excerpt {
    font-size: 0.775rem;
    color: var(--bs-secondary-color);
    line-height: 1.45;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.rk-item-date {
    font-size: 0.72rem;
    color: var(--bs-secondary-color);
    margin-top: 0.3rem;
}

.rk-tag {
    background-color: rgba(var(--bs-primary-rgb), 0.08);
    color: var(--bs-primary);
    border: 1px solid rgba(var(--bs-primary-rgb), 0.18);
    font-size: 0.67rem;
    font-weight: 600;
    padding: 0.18em 0.65em;
    border-radius: 999px;
    display: inline-block;
    white-space: nowrap;
    line-height: 1.5;
}

[data-bs-theme="dark"] .rk-tag {
    background-color: rgba(96, 165, 250, 0.12);
    color: #93c5fd;
    border-color: rgba(147, 197, 253, 0.25);
}

.rk-empty-icon {
    font-size: 3rem;
    color: var(--bs-secondary-color);
    opacity: 0.45;
}