:root {
    --color-bg: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-code: #010409;
    --color-text-primary: #c9d1d9;
    --color-text-secondary: #8b949e;
    --color-border: #30363d;
    --color-accent: #14B8A6;
    --color-success: #3fb950;
    --color-logo:  #14b8ad;
    --color-danger: #f85149;
    --color-level-a-bg: #c9510c;
    --color-level-aa-bg: #986700;
    --color-level-aaa-bg: #006b75;
    --theme-bg: #111827;
    --theme-text-primary: #F9FAFB;
    --theme-text-secondary: #9CA3AF;
    --theme-accent: #2DD4BF;
    --theme-accent-dark: #14B8A6;
}

[data-theme="light"] {
    --color-bg: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-bg-code: #f6f8fa;
    --color-text-primary: #24292f;
    --color-text-secondary: #57606a;
    --color-border: #d0d7de;
    --color-accent: #03675c;
    --color-success: #1f883d;
    --color-logo:  #14b8a8;
    --color-danger: #cf222e;
    --color-level-a-bg: #c9510c;
    --color-level-aa-bg: #986700;
    --color-level-aaa-bg: #006b75;
}

html { 
    scroll-behavior: smooth; 
}

body { 
    font-family: 'Inter', sans-serif; 
    background-color: var(--color-bg); 
    color: var(--color-text-primary); 
    transition: background-color 0.3s, color 0.3s;
}

.container { 
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem; 
}

.top-navbar {
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 2rem;
    position: sticky;
    top: 0;
    z-index: 50;
    transition: transform 0.3s ease-in-out;
  }

/* Styles for when navbar is hidden */
body.navbar-is-hidden .top-navbar {
    transform: translateY(-100%);
}
body.navbar-is-hidden .principle-section,
body.navbar-is-hidden details[id^="sc-"] {
    scroll-margin-top: 1rem;
}
  
  .navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    position: relative; /* For positioning the skip menu */
  }

/* --- New Skip Navigation Menu Styles --- */
.skip-nav-container {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    z-index: 60; /* Above navbar content */
}

.skip-nav-trigger {
    position: absolute;
    transform: translateY(-170%); /* Hide off-screen */
    transition: transform 0.3s;
    background-color: var(--color-accent);
    color: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
}

.skip-nav-trigger:focus {
    transform: translateY(0); /* Bring on-screen on focus */
}

.skip-nav-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    list-style: none;
    padding: 0.5rem;
    margin: 0;
    min-width: 212px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.skip-nav-menu[hidden] {
    display: none;
}

.skip-nav-menu li {
    padding: 0;
    margin: 0;
}

.skip-menu-item {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--color-text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: none;
}
.skip-menu-item:hover,
.skip-menu-item:focus {
    background-color: var(--color-accent);
    color: var(--color-bg);
    outline: none;
}
/* --- End Skip Menu Styles --- */

  .logo-font {
    font-family: 'Poppins', sans-serif;
}
.logo-kodo {
    color: var( --color-text-primary);
}
.logo-os {
    color: var(--color-logo);
}
  
  .navbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
  
  .navbar-links {
    display: flex;
    gap: 2rem;
    align-items: center;
   
  }
  
  .nav-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
  }
  
  .nav-link:hover {
    color: var(--color-accent);
    text-decoration-line: underline;

  }
  
  
  .hamburger {
    display: none;
    background: none;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
    color: var(--color-text-primary);
  }
  
  @media (max-width: 768px) {
    .hamburger {
      display: block;
    }
  
    .navbar-links {
      display: none;
      flex-direction: column;
      width: 100%;
      background-color: var(--color-bg-secondary);
      border-top: 1px solid var(--color-border);
      padding-top: 0.5rem;
      margin-top: 0.5rem;
    }
  
    .navbar-links.show {
      display: flex;
    }
  
    .navbar-right {
      flex-direction: row-reverse;
      gap: 0.5rem;
      width: 100%;
      justify-content: flex-end;
    }
  }
  
  .top-navbar #theme-toggle {
    border: none;
    background: transparent;
    padding: 0.5rem;
  }
  

.header { 
    text-align: center; 
    margin-bottom: 2rem; 
    border-bottom: 1px solid var(--color-border); 
    padding-bottom: 2rem; 
    position: relative; 
}
.header h1 { 
    font-size: 2.5rem; 
    font-weight: 700; 
    color: var(--color-text-primary); 

    margin-bottom: 0.5rem; 
}
.header p { 
    font-size: 1.125rem; 
    color: var(--color-text-secondary); 
}

#theme-toggle {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 24px;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
#theme-toggle .icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--color-text-primary);
}
#theme-toggle .sun-icon { display: none; }
#theme-toggle .moon-icon { display: block; }
[data-theme="light"] #theme-toggle .sun-icon { display: block; }
[data-theme="light"] #theme-toggle .moon-icon { display: none; }

.content-wrapper { 
    display: flex; 
    flex-direction: column-reverse; 
    gap: 2rem; 
}
@media (min-width: 1024px) {
    .content-wrapper { flex-direction: row; }
    #toc { width: 300px; flex-shrink: 0; }
}

#toc { 
    background-color: var(--color-bg-secondary); 
    border: 1px solid var(--color-border); 
    border-radius: 8px; 
    padding: 1.5rem; 
    position: sticky; 
    top: 5rem; 
    max-height: calc(100vh - 4rem); 
    display: flex; 
    flex-direction: column; 
}
#toc h2 { 
    font-size: 1.5rem; 
    font-weight: 600; 
    color: var(--color-text-primary); 
    margin-bottom: 1rem; 
    flex-shrink: 0; 
}
#toc ul { 
    list-style: none; 
    padding: 0; 
    overflow-y: auto; 
    flex-grow: 1; 
    padding-right: 0.75rem; 
}
#toc ul::-webkit-scrollbar { width: 6px; }
#toc ul::-webkit-scrollbar-track { background: transparent; }
#toc ul::-webkit-scrollbar-thumb { background-color: var(--color-border); border-radius: 3px; }
#toc ul::-webkit-scrollbar-thumb:hover { background-color: var(--color-accent); }

.main-content { 
    width: 100%; 
}

.principle-section,
details[id^="sc-"] { 
    scroll-margin-top: 6rem;
}

.principle-section {
    margin-bottom: 3rem; 
}
.principle-title { 
    font-size: 2rem; 
    font-weight: 700; 
    color: var(--color-text-primary); 
    margin-bottom: 1.5rem; 
    padding-bottom: 0.5rem; 
    border-bottom: 1px solid var(--color-border); 
}

details { 
    background-color: var(--color-bg-secondary); 
    border: 1px solid var(--color-border); 
    border-radius: 8px; 
    margin-bottom: 1rem; 
}

summary {
    font-size: 1.1rem;
    font-weight: 600;
    padding: 1rem 1.5rem;
    cursor: pointer;
    list-style: none;
    color: var(--color-accent);
  }
  
  .summary-left {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }
  
  .summary-text {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .chevron-icon {
    margin-left: auto;
    transition: transform 0.2s;
  }
  
details[open] > summary .chevron-icon {
    transform: rotate(90deg);
}

.details-content { 
    padding: 0 1.5rem 1.5rem; 
    border-top: 1px solid var(--color-border); 
    color: var(--color-text-primary); 
}
.details-content > p { 
    margin-top: 1rem; 
    line-height: 1.6; 
}

.example-section { 
    margin-top: 1.5rem; 
    display: grid; 
    grid-template-columns: 1fr; 
    gap: 1.5rem; 
}
@media (min-width: 768px) { 
    .example-section { grid-template-columns: 1fr 1fr; } 
}

.example-title { 
    font-size: 1.125rem; 
    font-weight: 500; 
    color: var(--color-text-secondary); 
    margin-bottom: 0.5rem; 
}
.example-box { 
    background-color: var(--color-bg); 
    border-radius: 6px; 
    padding: 1rem; 
    font-size: 0.9rem; 
}
.example-box p { 
    color: var(--color-text-secondary); 
}
.good-example { border-left: 4px solid var(--color-success); }
.bad-example { border-left: 4px solid var(--color-danger); }

.code-block { 
    background-color: var(--color-bg-code); 
    border: 1px solid var(--color-border); 
    border-radius: 6px; 
    padding: 1rem; 
    font-family: monospace; 
    white-space: pre-wrap; 
    word-break: break-all; 
    margin-top: 0.5rem; 
}

.level-badge { 
    font-size: 0.8rem; 
    padding: 0.2rem 0.6rem; 
    border-radius: 12px; 
    font-weight: 600; 
    flex-shrink: 0; 
    color: white; 
}
.level-a { background-color: var(--color-level-a-bg); }
.level-aa { background-color: var(--color-level-aa-bg); }
.level-aaa { background-color: var(--color-level-aaa-bg); }
.new-badge { 
    font-size: 0.7rem; 
    padding: 0.1rem 0.5rem; 
    border-radius: 12px; 
    font-weight: 600; 
    background-color: var(--color-accent); 
    color: var(--color-bg); 
    margin-left: 8px; 
}

/* --- TOC Accordion Styles --- */
#toc-list > li { 
    margin-bottom: 0; 
}
#toc-list > li:not(:first-child) { 
    border-top: 1px solid var(--color-border); 
    margin-top: 1rem; 
    padding-top: 1rem; 
}

.toc-summary { 
    padding: 0.5rem 0; 
    font-weight: 700; 
    color: var(--color-accent); 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    cursor: pointer; 
    list-style: none; 
    width: 100%; 
}
.toc-summary::-webkit-details-marker { 
    display: none; 
}
.toc-summary a { 
    color: inherit; 
    text-decoration: none; 
    flex-grow: 1; 
}

#toc details { 
    background-color: transparent; 
    border: none; 
    border-radius: 0; 
    margin-bottom: 0; 
}
#toc details > summary .chevron-icon { 
    width: 20px; 
    height: 20px; 
}
.toc-submenu { 
    list-style: none; 
    padding-left: 1rem; 
    margin: 0.5rem 0 0.5rem 0; 
}
.toc-item a { 
    color: var(--color-accent); 
    font-size: 0.9rem; 
    transition: opacity 0.2s ease-in-out; 
    display: block; 
    padding: 0.3rem 0; 
}
.toc-item a:hover { 
    opacity: 0.8; 
}