:root {
    --primary-color: #1D3C70;
    --secondary-color: #FFC107;
    --accent-color-lighter: #ffe08a;
    --bg-color: #ffffff;
    --bg-sidebar: #f4f7fa;
    --bg-hover: rgba(29, 60, 112, 0.05);
    --bg-active: rgba(29, 60, 112, 0.1);
    --text-color: #2c3e50;
    --text-secondary: #5a6d7d;
    --text-muted: #7f90a4;
    --border-color: #e0e6ed;
    --border-color-light: #e9edf2;
    --right-sidebar-bg: #ffffff;
    --right-sidebar-border: #e0e6ed;
    --heading-color: var(--primary-color);
    --link-color: var(--primary-color);
    --link-color-hover: var(--secondary-color);
    --active-item-text: var(--primary-color);
    --active-item-border: var(--secondary-color);
    --shadow-light: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --primary-color: #5a8ac1;
    --secondary-color: #FFC107;
    --accent-color-lighter: #ffe08a;
    --bg-color: #1e2a37;
    --bg-sidebar: #2c3e50;
    --bg-hover: rgba(90, 138, 193, 0.1);
    --bg-active: rgba(90, 138, 193, 0.15);
    --text-color: #ecf0f1;
    --text-secondary: #bdc3c7;
    --text-muted: #95a5a6;
    --border-color: #34495e;
    --border-color-light: #3b536a;
    --right-sidebar-bg: #2c3e50;
    --right-sidebar-border: #3b536a;
    --heading-color: var(--secondary-color);
    --link-color: var(--secondary-color);
    --link-color-hover: var(--primary-color);
    --active-item-text: var(--secondary-color);
    --active-item-border: var(--secondary-color);
    --shadow-light: rgba(0, 0, 0, 0.2);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Poppins:wght@500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    scroll-behavior: smooth;
}

body {
    line-height: 1.6;
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    text-align: left;
    font-size: 1rem;
    text-align: justify;
}

a {
    text-decoration: none;
    color: var(--link-color);
    transition: color 0.2s ease;
}

a:hover {
    color: var(--link-color-hover);
    text-decoration: underline;
}

ul {
    list-style-type: none;
}

header {
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 10;
    transition: background-color 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow-light);
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--heading-color);
}

.logo img {
    height: 40px;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-color);
}

.nav-links a:hover {
     color: var(--primary-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.auth-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-outline {
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-color);
}

.btn-outline:hover {
    background-color: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

.btn-primary:hover {
    background-color: #142b50;
    box-shadow: 0 2px 6px var(--shadow-light);
}

 [data-theme="dark"] .btn-primary {
     background-color: var(--primary-color);
     color: var(--text-color);
 }
 [data-theme="dark"] .btn-primary:hover {
     background-color: #4a73a6;
 }

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border: none;
    font-weight: 600;
}

.btn-secondary:hover {
    background-color: #e6b000;
    box-shadow: 0 2px 6px var(--shadow-light);
}
 [data-theme="dark"] .btn-secondary {
     color: var(--bg-color);
 }

#darkModeToggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: all 0.2s ease;
}

#darkModeToggle:hover {
    background-color: var(--bg-hover);
    color: var(--text-color);
}
 #darkModeToggle i {
     min-width: 16px;
     text-align: center;
 }

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 26px;
    cursor: pointer;
    padding: 4px 0;
}

.menu-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s ease;
}
 .menu-toggle.active span:nth-child(1) {
     transform: translateY(9px) rotate(45deg);
 }
  .menu-toggle.active span:nth-child(2) {
     opacity: 0;
 }
  .menu-toggle.active span:nth-child(3) {
     transform: translateY(-9px) rotate(-45deg);
 }

.container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.sidebar {
    width: 300px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 1.5rem 1rem;
    transition: transform 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
    flex-shrink: 0;
}

.search-box {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    /* margin-bottom: 2rem; */
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-box::placeholder {
    color: var(--text-muted);
}
 .search-box:focus {
     border-color: var(--primary-color);
     box-shadow: 0 0 0 3px rgba(29, 60, 112, 0.1);
 }
 [data-theme="dark"] .search-box:focus {
    box-shadow: 0 0 0 3px rgba(90, 138, 193, 0.15);
 }



.sidebar-title {
    font-size: 0.8rem;
    color: var(--right-sidebar-bg);
    margin-bottom: 0.3rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    background: var(--text-muted);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    border: 1px solid;
}

.sidebar-links a {
    display: block;
    padding: 0.6rem 0.75rem;
    margin-bottom: 0.4rem;
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 1rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-links a:hover {
    background-color: var(--bg-hover);
    color: var(--text-color);
}

.sidebar-links a.active {
    background-color: var(--bg-active);
    font-weight: 600;
    color: var(--active-item-text);
     border-left: 3px solid var(--active-item-border);
     padding-left: 0.5rem;
}



.sidebar-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.3rem 0.75rem;
    margin-bottom: 0.2rem;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-menu-header:hover {
    background-color: var(--bg-hover);
    color: var(--text-color);
}

.sidebar-menu-header .icon {
    transition: transform 0.3s ease;
    font-size: 0.9em;
    color: var(--text-muted);
}

.sidebar-menu-header.expanded .icon {
    transform: rotate(90deg);
    color: var(--primary-color);
}
 [data-theme="dark"] .sidebar-menu-header.expanded .icon {
     color: var(--secondary-color);
 }

.sidebar-submenu {
    margin-left: 1.2rem;
    padding-top: 0rem;
    overflow: hidden;
}

.sidebar-submenu.expanded {
    /* Initially set in the HTML markup */
}




.sidebar-submenu a {
    display: block;
    padding: 0.2rem 0.75rem;
    margin-bottom: 0.1rem;
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-submenu a:hover, .sidebar-section a:hover {
    background-color: var(--bg-hover);
    color: var(--text-color);
    text-decoration: none;
}



.sidebar-submenu a.active {
    background-color: var(--bg-active);
    font-weight: 600;
     color: var(--active-item-text);
     border-left: 3px solid var(--active-item-border);
     padding-left: 0.5rem;
}

.content-area {
    flex: 1;
    overflow-y: auto;
    display: flex;
    position: relative;
    padding: 1.5rem;
}

.content-wrapper {
    flex: 1;
    position: relative;
   
    margin: 0 auto;
    padding: 1rem 1.5rem;
   
}

.main-content {
    padding: 0;
    margin: 0;
     width: 100%;
}

.breadcrumb {
    margin-bottom: 2.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--link-color);
}
 .breadcrumb a:hover {
     color: var(--link-color-hover);
 }
 .breadcrumb span {
     margin: 0 0.5rem;
     color: var(--border-color);
 }

.section {
    scroll-margin-top: 40px;
    padding-bottom: 1rem;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    color: var(--heading-color);
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.8rem;
    /* margin-top: 2.5rem; */
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color-light);
}

 h3 {
     font-size: 1.3rem;
     margin-top: 2rem;
     margin-bottom: 1rem;
     color: var(--text-color);
 }

p {
    margin-bottom: 1.25rem;
    /* color: var(--text-secondary); */
    font-size: 1rem;
    line-height: 1.7;
}

ul.bullet-list {
    padding-left: 1.8rem;
    margin-bottom: 2rem;
    list-style-type: disc;
    color: var(--text-secondary);
}

ul.bullet-list li {
    margin-bottom: 0.8rem;
     line-height: 1.6;
}
 ul.bullet-list li strong {
     color: var(--text-color);
 }

.link-text {
    color: var(--link-color);
    font-weight: 500;
}
 .link-text:hover {
     color: var(--link-color-hover);
     text-decoration: underline;
 }

.tabs {
    display: flex;
    flex-wrap: wrap;
    margin: 2rem 0;
    gap: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}

.tab {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    background-color: var(--bg-sidebar);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s ease;
    position: relative;
    top: 1px;
}

.tab:hover {
    background-color: var(--bg-hover);
    color: var(--text-color);
}

.tab.active {
    background-color: var(--bg-color);
    font-weight: 600;
    color: var(--primary-color);
    border-color: var(--border-color);
    border-bottom: 2px solid var(--primary-color);
    z-index: 1;
}
 [data-theme="dark"] .tab.active {
     color: var(--secondary-color);
     border-bottom-color: var(--secondary-color);
 }

.tab-content {
    display: none;
    color: var(--text-secondary);
    padding-top: 1.5rem;
}

.tab-content.active {
    display: block;
}

.tab-content h3 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    color: var(--heading-color);
}

.mt-4 {
    margin-top: 2.5rem;
}

.right-sidebar {
    width: 260px;
    padding: 1.5rem 1rem;
    border: 1px solid var(--right-sidebar-border);
    background: var(--right-sidebar-bg);
    position: sticky;
    top: 8px;
    height: 80vh;
    right: 0;
    margin-left: 1.5rem;
    overflow-y: auto;
    z-index: 5;
    border-radius: 8px;
    max-height: calc(100vh - (60px + 1.5rem + 1.5rem));
    box-shadow: 0 2px 8px var(--shadow-light);
    flex-shrink: 0;
}

.right-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.right-sidebar-nav a {
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    color: var(--text-muted);
    font-size: 0.8rem;
    cursor: pointer;
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all 0.15s ease-in-out;
     line-height: 1.4;
}

.right-sidebar-nav a:hover {
    color: var(--text-color);
    border-left-color: var(--border-color);
}

.right-sidebar-nav a.active {
    background-color: transparent;
    font-weight: 600;
    color: var(--active-item-text);
    border-left-color: var(--active-item-border);
    border-left-width: 3px;
    padding-left: 0.5rem;
}

 .right-sidebar-nav a.level-2 {
     margin-left: 1rem;
     font-size: 0.9rem;
     border-left-width: 1px;
 }
  .right-sidebar-nav a.level-2.active {
      border-left-width: 2px;
  }

.dropdown {
    margin-bottom: 1.5rem;
     padding-bottom: 1.5rem;
     border-bottom: 1px solid var(--border-color-light);
}

.dropdown select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s ease;
}
 .dropdown select:focus {
     border-color: var(--primary-color);
 }

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 998;
}

.close-sidebar {
    display: none;
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 24px;
    height: 24px;
    cursor: pointer;
    z-index: 1000;
}

.close-sidebar:before,
.close-sidebar:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    border-radius: 2px;
}

.close-sidebar:before {
    transform: rotate(45deg);
}

.close-sidebar:after {
    transform: rotate(-45deg);
}
 [data-theme="dark"] .close-sidebar:before,
 [data-theme="dark"] .close-sidebar:after {
    background-color: var(--text-color);
 }

img:not(.logo img), .gif-embed {
    max-width: 100%;
    height: auto;
    display: block;
    /* margin: 1.5rem auto; */
    border-radius: 50vh;
    border: 1px solid #c7c7c7;
    box-shadow: 0px 2px 16px 0px rgb(0 0 0 / 23%);
}



.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: var(--bg-sidebar);
    margin: 1.5rem 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow-light);
}
.video-embed iframe,
.video-embed object,
.video-embed embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

 .demo-container {
     margin: 2rem 0;
     padding: 1.5rem;
     background-color: var(--bg-sidebar);
     border: 1px solid var(--border-color);
     border-radius: 8px;
     box-shadow: inset 0 1px 3px var(--shadow-light);
     color: var(--text-color);
 }
  .demo-container h3 {
      margin-top: 0;
      color: var(--primary-color);
      border-bottom: none;
      padding-bottom: 0.5rem;
  }

@media (max-width: 1200px) {
     .content-wrapper {
         padding-right: 0;
         max-width: 960px;
     }
    .right-sidebar {
        display: none;
    }
    .content-area {
         padding: 2rem;
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    header {
        padding: 1rem;
         box-shadow: 0 2px 4px var(--shadow-light);
    }

    .content-area {
        padding: 1.5rem 1.5rem;
        overflow-y: auto;
    }

     .content-wrapper {
         max-width: 100%;
         margin: 0;
         padding: 0;
     }

    .main-content {
        padding: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-links,
    .auth-buttons .btn:not(#darkModeToggle) {
        display: none;
    }
    .auth-buttons {
         gap: 0.75rem;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        
        z-index: 999;
        transform: translateX(-100%);
        padding-top: 4.5rem;
         box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .close-sidebar {
        display: block;
    }

    .overlay.active {
        display: block;
    }

    #darkModeToggle span {
        display: none;
    }
     #darkModeToggle {
         padding: 0.5rem;
     }

     h1 { font-size: 2rem; }
     h2 { font-size: 1.6rem; margin-top: 2rem;}
     h3 { font-size: 1.2rem; margin-top: 1.5rem;}

    
}

 @media (max-width: 480px) {
     header {
         padding: 0.8rem;
     }
     .logo {
         font-size: 1.2rem;
     }
     .logo img {
         height: 35px;
     }
      #darkModeToggle {
          padding: 0.4rem;
      }
     
      h1 { font-size: 1.8rem; }
      h2 { font-size: 1.4rem; margin-top: 1.8rem;}
      h3 { font-size: 1.1rem; margin-top: 1.2rem;}
      .tabs {
          gap: 0.5rem;
      }
      .tab {
          padding: 0.6rem 1rem;
          font-size: 0.9rem;
      }
       
 }
 .footer {
    text-align: center;
    padding: 0.5rem;
    background-color: var(--bg-sidebar);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
 }

 ::-webkit-scrollbar{ width: 6px; }
 ::-webkit-scrollbar-track { background: #fff;}
 ::-webkit-scrollbar-thumb { background: #1d3c70;border-radius: 0;}
 
 ::selection {
   background-color: #f9b90f;
   color: #fff;
 }

 .main-content li {
    margin-bottom: 12px;
}

.main-content ul {
    margin-bottom: 12px;
    padding-left: 32px;
}

.main-content ol {
    margin-bottom: 12px;
    padding-left: 32px;
}


.main-content p {
    margin-bottom: 8px;
}

.main-content ul {
    list-style-type: initial;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio (315/560 = 0.5625) */
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: #000;
}
  
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}


a.sidebar-menu-header.active {
    background-color: var(--bg-active);
    font-weight: 600;
    color: var(--active-item-text);
    padding-left: 0.5rem;
    border-left: 3px solid var(--active-item-border);
}

label {
    display: block;
}