@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&display=swap');
:root {
  --blue-ocean-start: #6633FF;
  --blue-ocean-end: #00b5ff;
  --text-color: #2c3e50;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --border-color: rgba(0, 0, 0, 0.06);
  --hover-bg: #f0f7ff;
  --shadow-color: rgba(102, 51, 255, 0.08);
}
[data-theme="dark"] {
  --text-color: #f1f5f9;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --border-color: rgba(255, 255, 255, 0.08);
  --hover-bg: #334155;
  --shadow-color: rgba(0, 0, 0, 0.3);
}
* {
  box-sizing: border-box;
  transition: font-size 0.3s ease;
}
html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  transition: font-size 0.3s ease;
}
body {
  font-family: 'Kanit', Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease, font-size 0.3s ease;
  display: flex;
  flex-direction: column;
}
#main-content-area {
  flex: 1;
  width: 100%;
}
.header {
  width: 100%;
  position: relative;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--blue-ocean-start) 0%, var(--blue-ocean-end) 100%);
  box-shadow: 0 4px 20px rgba(0, 181, 255, 0.2);
  display: flex;
  align-items: center;
  padding: 20px;
  z-index: 10;
}
/* ==========================================================================
   Folder Toggle (เฉพาะ O13, O15)
   ========================================================================== */
.folder-toggle {
  cursor: pointer;
  background-color: #f8f9fa !important;
  font-weight: 600;
  color: #0d6efd !important;
  border-bottom: 1px solid var(--border-color) !important;
  padding: 12px 20px !important;
}
.folder-main {
  background-color: #e9ecef !important;
  font-size: 1.1rem;
  color: #084298 !important;
}
.folder-sub {
  padding-left: 2rem !important;
}
.folder-toggle:hover {
  background-color: #e2e6ea !important;
  color: #0a58ca !important;
}
.folder-content {
  background-color: var(--card-bg);
}
.sub-item {
  border: none !important;
  border-bottom: 1px solid var(--border-color) !important;
  border-left: 3px solid #ff4757 !important;
  margin-left: 15px;
  padding: 10px 20px 10px 30px !important;
  display: flex !important;
  align-items: center;
  background-color: var(--card-bg) !important;
  color: var(--text-color) !important;
}
.sub-item:hover {
  background-color: var(--hover-bg) !important;
}
/* ----------------------------------------------------
    โหมดมืดสำหรับระบบ Folder Toggle
   ---------------------------------------------------- */
[data-theme="dark"] .folder-toggle {
  background-color: rgba(255, 255, 255, 0.05) !important;
  color: #60a5fa !important; /* ปรับสีตัวอักษรให้สว่างขึ้นในโหมดมืด */
}
[data-theme="dark"] .folder-main {
  background-color: rgba(255, 255, 255, 0.1) !important;
  color: #93c5fd !important;
}
[data-theme="dark"] .folder-toggle:hover {
  background-color: rgba(255, 255, 255, 0.15) !important;
  color: #bfdbfe !important;
}
.modern-menu-wrapper {
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  position: sticky;
  top: 0;
  z-index: 1040;
  display: block !important;
  visibility: visible !important;
}
.modern-menu-wrapper::-webkit-scrollbar {
  display: none;
}
.modern-menu-bar .nav-link {
  color: var(--text-color);
  font-weight: 400;
  font-size: 1rem;
  padding: 10px 22px;
  border-radius: 30px;
  border: 1px solid transparent;
  transition: all 0.3s ease;
  background: transparent;
}
.modern-menu-bar .nav-link:hover {
  background-color: var(--hover-bg);
  color: var(--blue-ocean-end);
}
.modern-menu-bar .nav-link.active {
  background: linear-gradient(135deg, var(--blue-ocean-start) 0%, var(--blue-ocean-end) 100%) !important;
  color: #ffffff !important;
  box-shadow: 0 6px 15px rgba(102, 51, 255, 0.3);
  font-weight: 500;
  transform: translateY(-2px);
}
/* ==========================================================================
   ปุ่มตั้งค่าและแผงควบคุมโหมดมืด (ระบบซ่อน/แสดง)
   ========================================================================== */
.control-panel-wrapper {
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 1060;
  display: flex;
  flex-direction: column-reverse;
  align-items: flex-end;
  gap: 12px;
}
.btn-control-toggle {
  background: linear-gradient(135deg, var(--blue-ocean-start) 0%, var(--blue-ocean-end) 100%);
  color: #ffffff;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.25rem;
  box-shadow: 0 4px 15px rgba(0, 181, 255, 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}
.btn-control-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(0, 181, 255, 0.6);
}
.control-panel {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 8px 12px;
  border-radius: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px) scale(0.9);
  transform-origin: bottom right;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
[data-theme="dark"] .control-panel {
  background: rgba(30, 41, 59, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.control-panel.show-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
.btn-control {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.05rem;
  cursor: pointer;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s, font-size 0.3s ease;
}
.btn-control:hover {
  background: var(--hover-bg);
  color: var(--blue-ocean-end);
}
.control-divider {
  color: var(--border-color);
  user-select: none;
  margin: 0 2px;
}
@media (max-width: 768px) {
  .header {
    padding: 20px 15px;
    align-items: flex-start;
  }
  .header .container-fluid {
    padding-right: 65px !important;
  }
  .header .d-flex {
    justify-content: flex-start !important;
  }
  .header img {
    height: 50px !important;
    margin-right: 10px !important;
  }
  .header h1 {
    font-size: 1.15rem !important;
    line-height: 1.5;
    margin-bottom: 5px !important;
  }
  .header h2 {
    font-size: 0.9rem !important;
  }
  .control-panel-wrapper {
    top: 15px;
    bottom: auto;
    right: 15px;
    flex-direction: column;
  }
  .btn-control-toggle {
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }
  .control-panel {
    transform-origin: top right;
    transform: translateY(-15px) scale(0.9);
  }
  .control-panel.show-panel {
    transform: translateY(0) scale(1);
  }
  .btn-control {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }
  .modern-menu-wrapper {
    position: relative;
    z-index: 1040;
  }
  .modern-menu-bar {
    padding: 10px !important;
    gap: 8px !important;
  }
  .modern-menu-bar .nav-link {
    padding: 8px 16px;
    font-size: 0.95rem;
  }
}
/* ==========================================================================
   ข้อความและหัวข้อ
   ========================================================================== */
.t-topic {
  text-align: left;
  padding-top: 15px;
  margin: 0 0 10px 0;
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--blue-ocean-start) 0%, var(--blue-ocean-end) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.t-subtopic {
  text-align: left;
  margin: 0 0 25px 0;
  font-size: 1.25rem;
  color: #64748b;
}
[data-theme="dark"] .t-subtopic {
  color: #94a3b8;
}

.s-topic {
  font-weight: 700;
  background: linear-gradient(135deg, var(--blue-ocean-start) 0%, var(--blue-ocean-end) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.list-group-item i.fa-hover-hidden, .list-group-item i.fa-hover-show {
  width: 25px;
  text-align: center;
}
@keyframes smoothIconFadeIn {
  0% {
    opacity: 0;
    transform: scale(0.6) translateY(5px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}
.fa-hover-show {
  display: none !important;
}
.fa-hover-hidden {
  display: inline-block !important;
}
.list-group-item:hover .fa-hover-show {
  display: inline-block !important;
  animation: smoothIconFadeIn 0.3s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}
.list-group-item:hover .fa-hover-hidden {
  display: none !important;
}
.accordion {
  background: transparent;
}
.accordion-item.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px !important;
  margin-bottom: 18px;
  box-shadow: 0 4px 15px var(--shadow-color);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, font-size 0.3s ease;
}
.accordion-item.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 51, 255, 0.15);
}
.accordion-button {
  font-family: 'Kanit', sans-serif;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-color);
  background-color: transparent;
  padding: 20px 25px;
  border: none;
  box-shadow: none !important;
}
.accordion-button:not(.collapsed) {
  color: #ffffff;
  background: linear-gradient(135deg, var(--blue-ocean-start) 0%, var(--blue-ocean-end) 100%);
  font-weight: 600;
}
.accordion-button::after {
  filter: grayscale(1) invert(0);
}
.accordion-button:not(.collapsed):after {
  filter: brightness(0) invert(1);
}
.list-group-item {
  background-color: var(--card-bg);
  color: var(--text-color);
  border-color: var(--border-color);
  padding: 16px 25px;
  text-decoration: none !important;
  font-size: 1.05rem;
  transition: all 0.25s ease;
}
.list-group-item:not(.folder-toggle):hover {
  background-color: var(--hover-bg);
  color: var(--blue-ocean-end);
  padding-left: 32px;
}
/* สี Icon */
.sky-color {
  color: #00b5ff;
}
.black-color {
  color: var(--text-color);
}
.red-color {
  color: #ff4757;
}
.gold-color {
  color: #ffa502;
}
.green-color {
  color: #2ed573;
}