:root { /* ---------------- root ---------------- */           
    --black: #0c0c0e; /* background */
    --white: #f9f9f6; /* text */
    --grey: #9B9BA0; /* for ui elements */
    --blue: #698fff; /* text selection */
    --green: #00ee94; /* highlighted words */
    --red: #ff3b5d; /* highlighted words */
    --header-1: 2rem; /* font size headline */
    --header-2: 1.5rem; /* font size subline */
    --buttons: 1.2rem; /* font size buttons */
    --scrolling-text: 1rem; /* 1rem = 16px, standard browser font size */
    --figcaption: 0.8rem; /* font size figcaption */
    --base-font-size: 16px; /* Standardwert für die Schriftgröße */
}

/* ---------------- cursor ---------------- */

* {
    cursor: url("../assets/cursor/"), auto;
}


/* ---------------- html & body ---------------- */


html, body {
    margin: 0;
    border: 0;
    padding: 0;
    min-height: 100%;
    user-select: text;
    background-color: var(--white);
    overflow-y: auto;   /* vertical scrolling */
    overflow-x: hidden; /* no horizontal scrolling */
    max-width: none;
    scroll-behavior: auto;
    font-size: var(--base-font-size, 1rem);
}

/* ---------------- img ---------------- */

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 6px auto;
    user-select: none;
}

/* ---------------- video iframe ---------------- */

video, iframe {
    max-width: 100%;
    margin: 0;
}

/* ---------------- scrollbar ---------------- */  

::-webkit-scrollbar-track {
    margin: 20px 0px;
    --background-scrollbar: transparent;    
}

::-webkit-scrollbar { 
    width: 0px;
    --background-scrollbar: transparent;    
}

::-webkit-scrollbar-thumb {
    background: transparent;
}

::-webkit-scrollbar-corner {    
    --background-scrollbar: transparent;    
}

/* ---------------- selected words ---------------- */

::selection { 
    background-color: var(--black);
    color: var(--white);
}

/* ---------------- links ---------------- */

a { 
    text-decoration: none;
    color: var(--white);
    user-select: none;
}

/* -------- font: Inter Display -------- */

@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 100; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Thin.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 100; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-ThinItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 200; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-ExtraLight.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 200; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-ExtraLightItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 400; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Light.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 300; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-LightItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 400; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Regular.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 400; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Italic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 500; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Medium.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 500; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-MediumItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 600; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-SemiBold.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 600; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-SemiBoldItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 700; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Bold.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 700; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-BoldItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 800; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-ExtraBold.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 800; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-ExtraBoldItalic.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: normal; font-weight: 900; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-Black.woff2") format("woff2"); }
@font-face { font-family: "InterDisplay"; font-style: italic; font-weight: 900; font-display: swap; src: url("../assets/fonts/inter/InterDisplay-BlackItalic.woff2") format("woff2"); }

/* -------- font: source-code-sans -------- */

@font-face { font-family: 'source-code-sans'; src: url('../assets/fonts/source-code/WOFF2/OTF/SourceCodePro-Regular.otf.woff2') format('woff2'); }
@font-face { font-family: 'source-code-sans-bold'; src: url('../assets/fonts/source-code/WOFF2/OTF/SourceCodePro-Bold.otf.woff2') format('woff2'); }
@font-face { font-family: 'source-code-sans-italic'; src: url('../assets/fonts/source-code/WOFF2/OTF/SourceCodePro-It.otf.woff2') format('woff2'); }

/* -------- font: IBMPlexMono -------- */

@font-face { font-family: 'IBMPlexMono'; font-style: normal; src: url('../assets/fonts/IBMPlexMono/IBMPlexMono.woff2') format('woff2'); }

/* ---------------- nav ---------------- */

nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px; 
    background: linear-gradient(
        to bottom,
        var(--white) 0%,   /* Weiß oben */
        var(--white) 50%,  /* Etwas weniger opak */
        rgba(255, 255, 255, 0) 100%    /* Vollständig transparent am Ende */
    );
    z-index: 1000;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 0px 0px 40px 80px;
    height: 180px;
}

/* Nav buttons container */
.nav-buttons {
    display: flex;
    gap: 10px;
    position: absolute;
    left: 80px;
    top: 15px;
}

/* Common styles for nav buttons */
#index-btn,
#glossary-btn,
#sources-btn,
#download-btn {
    padding: 0px 10px 0px 10px;
    line-height: 0rem;
    background-color: var(--black);
    color: var(--green);
    border: none;
    margin: 0;
    cursor: pointer;
    font-weight: regular;
    user-select: none;
    transition: transform 0.2s ease;
    font-family: 'IBMPlexMono', monospace;
    border-radius: 6px;
}

#index-btn:hover,
#glossary-btn:hover,
#sources-btn:hover,
#download-btn:hover {
    transform: scale(1.05);
}

#index-btn:focus,
#glossary-btn:focus,
#sources-btn:focus,
#download-btn:focus {
    outline: none;
}

/* Language toggle button */
#lang-btn {
    padding: 0px 10px 0px 10px;
    line-height: 0rem;
    background-color: var(--black);
    color: var(--green);
    border: none;
    margin: 0;
    cursor: pointer;
    font-weight: regular;
    user-select: none;
    transition: transform 0.2s ease;
    font-family: 'IBMPlexMono', monospace;
    border-radius: 6px;
}

#lang-btn:hover {
    transform: scale(1.05);
}

/* VS Code Sidebar Styles */
#index-sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 280px;
    height: calc(100vh - 60px);
    background-color: var(--black);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 1001;
    overflow-y: auto;
    padding: 30px 20px 20px 20px;
    box-sizing: border-box;
}

/* Show scrollbar for index sidebar */
#index-sidebar {
    -ms-overflow-style: auto;
}

#index-sidebar::-webkit-scrollbar {
    width: 6px;
    display: block;
}

#index-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

#index-sidebar::-webkit-scrollbar-thumb {
    background: #424242;
    border-radius: 3px;
}

#index-sidebar::-webkit-scrollbar-thumb:hover {
    background: #4f4f4f;
}

#index-sidebar.open {
    transform: translateX(0);
}

/* VS Code Sidebar Styles for Glossary */
#glossary-sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 280px;
    height: calc(100vh - 60px);
    background-color: var(--black);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 1001;
    overflow-y: auto;
    padding: 30px 20px 20px 20px;
    box-sizing: border-box;
}

/* Show scrollbar for glossary sidebar */
#glossary-sidebar {
    -ms-overflow-style: auto;
    scrollbar-width: auto;
}

#glossary-sidebar::-webkit-scrollbar {
    width: 6px;
    display: block;
}

#glossary-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

#glossary-sidebar::-webkit-scrollbar-thumb {
    background: #424242;
    border-radius: 3px;
}

#glossary-sidebar::-webkit-scrollbar-thumb:hover {
    background: #4f4f4f;
}

#glossary-sidebar.open {
    transform: translateX(0);
}

/* Sidebar content */
#glossary-sidebar .sidebar-content {
    padding: 8px 0;
}

/* Section (h2) in glossary */
#glossary-sidebar .h2 {
    display: flex;
    flex-wrap: wrap;
    padding: 10px 16px;
    color: var(--white);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#glossary-sidebar .h2 p {
    margin: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Subsection (h3) in glossary */
#glossary-sidebar .h3 {
    display: flex;
    flex-wrap: wrap;
    padding: 8px 16px 8px 32px;
    color: var(--grey);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#glossary-sidebar .h3 p {
    margin: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Active/selected item in glossary */
#glossary-sidebar .h2:active,
#glossary-sidebar .h3:active {
    background-color: var(--green);
}

/* VS Code Sidebar Styles for Sources */
#sources-sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 280px;
    height: calc(100vh - 60px);
    background-color: var(--black);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 1001;
    overflow-y: auto;
    padding: 30px 20px 20px 20px;
    box-sizing: border-box;
}

/* Show scrollbar for sources sidebar */
#sources-sidebar {
    -ms-overflow-style: auto;
}

#sources-sidebar::-webkit-scrollbar {
    width: 6px;
    display: block;
}

#sources-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

#sources-sidebar::-webkit-scrollbar-thumb {
    background: #424242;
    border-radius: 3px;
}

#sources-sidebar::-webkit-scrollbar-thumb:hover {
    background: #4f4f4f;
}

#sources-sidebar.open {
    transform: translateX(0);
}

/* Sidebar content */
#sources-sidebar .sidebar-content {
    padding: 8px 0;
}

/* Source item in sources sidebar */
#sources-sidebar .source-item {
    padding: 10px 16px;
    color: var(--white);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.8rem;
    line-height: 1.4;
    cursor: pointer;
    transition: background-color 0.2s;
    border-bottom: 1px solid #333;
}

#sources-sidebar .source-item:hover {
    background-color: #333;
}

#sources-sidebar .source-item p {
    margin: 0;
}

/* Section (h2) in sources */
#sources-sidebar .h2 {
    display: flex;
    padding: 10px 16px;
    color: var(--white);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#sources-sidebar .h2 p {
    margin: 0;
}

/* Subsection (h3) in sources */
#sources-sidebar .h3 {
    display: flex;
    padding: 8px 16px 8px 32px;
    color: var(--grey);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#sources-sidebar .h3 p {
    margin: 0;
}

/* Active/selected item in sources */
#sources-sidebar .h2:active,
#sources-sidebar .h3:active {
    background-color: var(--green);
}

/* Glossary reference numbers in text */
.glossary-ref,
.glossary-ref-eng {
    display: inline !important;
    white-space: nowrap;
    color: var(--green);
    font-family: 'IBMPlexMono', monospace;
    cursor: pointer;
    font-weight: bold;
    transition: color 0.2s ease;
}

.glossary-ref:hover,
.glossary-ref-eng:hover {
    color: var(--white);
    text-decoration: underline;
}

/* Push content when sidebar opens */
body.sidebar-open .line-numbers,
body.sidebar-open .content-wrapper,
body.sidebar-open main {
    transform: translateX(280px);
    transition: transform 0.25s ease;
}

html.sidebar-open {
    overflow: auto;
}

/* Ensure sidebars are scrollable */
#index-sidebar,
#glossary-sidebar,
#sources-sidebar {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* Sidebar content */
#index-sidebar .sidebar-content {
    padding: 8px 0;
}

/* Section (h2) */
#index-sidebar .h2 {
    display: flex;
    flex-wrap: wrap;
    padding: 10px 16px;
    color: var(--white);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#index-sidebar .h2 p {
    margin: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Subsection (h3) */
#index-sidebar .h3 {
    display: flex;
    flex-wrap: wrap;
    padding: 8px 16px 8px 32px;
    color: var(--grey);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#index-sidebar .h3 p {
    margin: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Active/selected item */
#index-sidebar .h2:active,
#index-sidebar .h3:active {
    background-color: var(--green);
}

/* Document title entry at the top of the index sidebar */
#index-sidebar .h1-sidebar {
    display: flex;
    flex-wrap: wrap;
    padding: 10px 16px 14px 16px;
    color: var(--white);
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 1px solid #333;
    margin-bottom: 6px;
    transition: background-color 0.2s;
    line-height: 1.5;
}

#index-sidebar .h1-sidebar p {
    margin: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

#index-sidebar .h1-sidebar:active {
    background-color: var(--green);
}

/* Overlay when sidebar is open */
#sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s;
}

#sidebar-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* Dropdown-Menü-Stile - Hidden (replaced by VS Code sidebar) */
#index-dropdown {
    display: none;
}

/* Sidebar overlay */


/* ---------------- reading area ---------------- */

#reading-area {
    font-size: var(--base-font-size);
    font-variation-settings: "opsz" 16;
}

#reading-area {
  --base-font-size: 16px;
}

#reading-area p,
#reading-area .scrolling-text,
#reading-area .scrolling-text-italic,
#reading-area .h2,
#reading-area .h2-eng,
#reading-area .h3,
#reading-area .h3-eng,
#reading-area .h4 {
  font-size: var(--base-font-size);
  font-weight: var(--font-weight, 400);
}

#reading-area .h1,
#reading-area .h1-eng {
  font-size: var(--base-font-size);
  font-weight: 900;
}

#reading-area {
  --base-font-size: 16px;
  --base-line-height: 1.6;
  --font-weight: 400;

  font-size: var(--base-font-size);
  line-height: var(--base-line-height);
}

.h1, .h1-eng { 
    font-weight: 900;
    line-height: 1.1; 
}
.h2, .h2-eng { line-height: 1.2; }
.h3, .h3-eng { line-height: 1.3; }
.h4 { line-height: 1.35; }

.scrolling-text,
.scrolling-text-italic,
.scrolling-text-eng,
.scrolling-text-italic-eng {
  line-height: var(--base-line-height);
}

/* Hide dropdown content - they're just data containers for sidebars */
.dropdown-content {
    display: none !important;
}

/* Language visibility - Default is English */
.h1, .h2, .h3, .h4, .scrolling-text, .scrolling-text-italic {
    display: none;
}

/* Nav and controls should be visible in both languages */
nav,
#play-pause-btn,
.ui-slider {
    display: flex !important;
}

/* Hide German content when in English mode (but not in dropdowns) */
body.english-mode .h1, 
body.english-mode .h2, 
body.english-mode .h3, 
body.english-mode .h4, 
body.english-mode .scrolling-text, 
body.english-mode .scrolling-text-italic,
body.english-mode .glossar,
body.english-mode .sources {
    display: none;
}

/* Show English content when in English mode */
body.english-mode .h1-eng, 
body.english-mode .h2-eng, 
body.english-mode .h3-eng, 
body.english-mode .h4-eng, 
body.english-mode .scrolling-text-eng, 
body.english-mode .scrolling-text-italic-eng,
body.english-mode .glossar-eng,
body.english-mode .sources-eng {
    display: block;
}

/* Hide English content when in German mode */
body.german-mode .h1-eng, 
body.german-mode .h2-eng, 
body.german-mode .h3-eng, 
body.german-mode .h4-eng, 
body.german-mode .scrolling-text-eng, 
body.german-mode .scrolling-text-italic-eng,
body.german-mode .glossar-eng,
body.german-mode .sources-eng {
    display: none;
}

/* Show German content when in German mode */
body.german-mode .h1, 
body.german-mode .h2, 
body.german-mode .h3, 
body.german-mode .h4, 
body.german-mode .scrolling-text, 
body.german-mode .scrolling-text-italic,
body.german-mode .glossar,
body.german-mode .sources {
    display: block;
}

/* ---------------- draggable img ---------------- */

.draggable {
    position: absolute;
    cursor: grab;
    z-index: 10;
    user-select: none;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    border-radius: 2px;
}

.draggable.active,
  .draggable:hover {
    border-color: var(--green);
}

.draggable img {
    width: 100%;
    height: 100%;
    display: block;
    pointer-events: none;
    user-select: none;
}

.resize-handle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--green);
    border-radius: 0%;
    display: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.draggable.active .resize-handle,
  .draggable:hover .resize-handle {
    display: block;
}

.handle-nw { top: -5px; left: -5px; cursor: nwse-resize; }

.handle-ne { top: -5px; right: -5px; cursor: nesw-resize; }

.handle-sw { bottom: -5px; left: -5px; cursor: nesw-resize; }

.handle-se { bottom: -5px; right: -5px; cursor: nwse-resize; }

/* Image caption */
.draggable .image-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--black);
    padding: 5px 10px;
    font-family: 'IBMPlexMono', monospace;
    font-size: 12px;
    font-style: italic;
    color: var(--green);
    text-align: center;
    pointer-events: none;
}

/* ---------------- draggable images ---------------- */

.image-MH {
  width: 300px;
  height: 370px;
  top: 4000px;
  left: 600px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-apollo-02 {
  width: 250px;
  height: 250px;
  top: 4200px;
  left: 700px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-apollo-04 {
  width: 300px;
  height: 300px;
  top: 4300px;
  left: 600px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-jscode {
  width: 400px;
  height: 470px;
  top: 1800px;
  left: 480px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-punchcard {
  width: 400px;
  height: 200px;
  top: 4000px;
  left: 200px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-eniac {
  width: 400px;
  height: 300px;
  top: 4400px;
  left: 300px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-sketch-01 {
  width: 400px;
  height: 300px;
  top: 4600px;
  left: 200px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-sketch-02 {
  width: 250px;
  height: 400px;
  top: 4600px;
  left: 200px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-RS {
  width: 300px;
  height: 200px;
  top: 5100px;
  left: 600px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-xerox {
  width: 400px;
  height: 300px;
  top: 5200px;
  left: 400px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-github-01 {
  width: 400px;
  height: 300px;
  top: 8200px;
  left: 500px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-github-02 {
  width: 450px;
  height: 300px;
  top: 8300px;
  left: 600px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}

.image-linux {
  width: 250px;
  height: 300px;
  top: 7800px;
  left: 300px;
  border-radius: 10px;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.8));
}


/* ---------------- horizontal ui slider ---------------- */

.ui-slider {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 20px;
  user-select: none;
  font-family: "InterDisplay";
  color: var(--black);
  min-width: 120px;
}

/* value (oben) */
.slider-value {
  font-size: 0.7rem;
  opacity: 0.7;
  text-align: left;
}

/* label (unten) */
.slider-label {
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  opacity: 0.5;
  font-family: 'IBMPlexMono', monospace;
}

/* range */
.ui-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 2px;
  background: var(--grey);
  outline: none;
  cursor: pointer;
}

/* webkit thumb */
.ui-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 2px;
  height: 20px;
  background: var(--black);
  border-radius: 0;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.ui-slider input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

/* firefox thumb */
.ui-slider input[type="range"]::-moz-range-thumb {
  width: 2px;
  height: 20px;
  background: var(--black);
  border-radius: 0;
  border: none;
  cursor: pointer;
}


#play-pause-btn {
    margin-right: 20px;
    width: 36px;
    height: 36px;
    padding: 1px 0 0 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 18px;
    line-height: 1;
    color: var(--white);
    background-color: var(--black);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    user-select: none;
    font-family: 'IBMPlexMono', monospace;
    font-style: normal;
    font-weight: regular;
    flex-shrink: 0;
}

#play-pause-btn:hover {
    transform: scale(1.1);
    background-color: var(--green);
}

#glossar-btn {
    padding: 30px 20px 20px 10px;
    background: none;
    border: none;
    color: var(--black);
    font-size: var(--buttons);
    cursor: pointer;
    font-family: "InterDisplay";
    font-style: normal;
    font-weight: 400;
    user-select: none;
}

#sources-btn,
#download-btn {
    padding: 0px 10px 0px 10px;
    line-height: 0rem;
    background-color: var(--black);
    color: var(--green);
    border: none;
    margin: 0;
    cursor: pointer;
    font-weight: regular;
    user-select: none;
    transition: transform 0.2s ease;
    font-family: 'IBMPlexMono', monospace;
    border-radius: 6px;
}

/* code editor numbers */

.line-numbers {
    position: fixed;
    top: 130px;
    left: 0;
    width: 60px;
    height: calc(100vh - 130px);
    background: var(--white);
    border-right: 1px solid var(--black);
    font-family: "IBMPlexMono", monospace;
    font-size: var(--base-font-size);  /* Gleiche Schriftgröße wie im reading-area */
    line-height: var(--base-line-height); /* Gleiche Zeilenhöhe wie im reading-area */
    display: block;
    padding: 15px 0 5px 0;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 100;
    text-align: right;
    transition: transform 0.25s ease;
    pointer-events: auto;
}


/* Scrollbar sichtbar & minimal */
.line-numbers::-webkit-scrollbar {
    width: 4px;
}

.line-numbers::-webkit-scrollbar-thumb {
    background: rgba(0,0,0,0.2);
}

.line-number {
    display: block;
    text-align: right;
    padding-right: 10px;
    cursor: pointer;
    opacity: 0.6;
    user-select: none;
}

.line-number:hover {
    opacity: 1;
    color: var(--green);
}


.line-numbers span {
    opacity: 0.15;
}

::selection { 
    background-color: var(--black);
    color: var(--white);
}


.content-wrapper {
    display: flex;
    flex-direction: column;
    transition: transform 0.25s ease;
}

/* Platz für Nummern schaffen */
#reading-area {
    font-size: var(--base-font-size);
    line-height: var(--base-line-height); /* Zeilenhöhe synchronisieren */
    padding-left: 60px;  /* Platz für Zeilennummern */
    max-width: calc(var(--base-font-size) * 35);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* einzelne Nummern */
.line-numbers span {
    display: block;
    opacity: 0.3;
    padding-right: 10px;
    text-align: right;
}


.scrolling-text,
.scrolling-text-italic {
  font-size: 1em;
}


.h1, .h1-eng {
    max-width: 750px;
    padding: 100px 0px 0px 80px;
    align-items: left;
    font-family: "InterDisplay";
    font-size: 5rem;
    font-style: normal;
    font-weight: 900;
    line-height: 1.1;
    color: var(--black);
    display: block;
}

.h2, .h2-eng {
    max-width: 750px !important;
    padding: 0px 0px 0px 20px;
    align-items: left;
    font-family: "InterDisplay";
    font-style: normal;
    font-size: 1.8rem;
    line-height: 1.8rem;
    color: var(--black);
    white-space: normal;
    text-decoration: underline;
    text-decoration-color: var(--green);
    text-underline-offset: 8px;
}

.h3, .h3-eng {
    max-width: 750px !important;
    padding: 0px 0px 0px 50px;
    align-items: left;
    font-family: "InterDisplay";
    font-style: normal;
    font-size: 1.5rem;
    line-height: 1.3rem;
    color: var(--black);
    white-space: normal;
    position: relative;
    text-decoration: underline;
    text-decoration-color: var(--green);
    text-underline-offset: 6px;
}

.h3 p,
.h3-eng p {
    position: relative;
    width: fit-content;
}

.h4 {
    max-width: 750px;
    padding: 0px 0px 0px 80px;
    align-items: left;
    font-family: "InterDisplay";
    font-style: normal;
    font-size: 1rem;
    line-height: 1rem;
    color: var(--black);
    white-space: normal;
    position: relative;
}

.h4 p {
    position: relative;
    width: fit-content;
}

/* Active section - green highlight when scrolled to */
#reading-area .h2.active-section,
#reading-area .h3.active-section {
    color: var(--green);
}

.h2.active-section p,
.h3.active-section p {
    color: var(--green);
}

.scrolling-text, .scrolling-text-eng {
    max-width: 750px;
    padding: 0px 0px 40px 20px;
    align-items: left;
    font-family: "InterDisplay";
    font-style: normal;
    font-size: var(--scrolling-text);
    line-height: var(--base-line-height);
    color: var(--black);
    white-space: normal;
}

.scrolling-text-italic, .scrolling-text-italic-eng {
    max-width: 750px;
    padding: 0px 0px 0px 20px;
    align-items: left;
    font-family: "InterDisplay";
    font-style: italic;
    font-size: var(--scrolling-text);
    line-height: var(--base-line-height);
    color: var(--black);
    white-space: normal;
}

/* Glossary styles - hidden in main content, only shown in sidebar */
.glossar,
.glossar-eng {
    display: none;
}

/* Sources styles */
#sources-dropdown p {
    padding: 8px 20px;
    font-family: "InterDisplay";
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--black);
    margin: 0;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

#sources-dropdown p:last-child {
    border-bottom: none;
}

#sources-dropdown p:only-child,
#sources-dropdown p:first-child {
    font-style: italic;
    opacity: 0.8;
}

/* Source item in sidebar */
.source-item {
    padding: 12px 20px;
    font-family: "InterDisplay";
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--black);
    border-bottom: 1px solid var(--grey);
}

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

/* Glossary sidebar items */
.glossar-item {
    padding: 15px 20px;
    font-family: 'IBMPlexMono', monospace;
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--white);
    border-bottom: 1px solid var(--grey);
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container-landing-page {
        max-width: 90%;
    }

    .container-inhaltserzeichnis {
        max-width: 90%;
    }

    .h1, .h1-eng {
        font-size: 3rem;
        font-weight: 900;
        line-height: 1.1;
        padding-left: 40px;
    }

    .h2, .h2-eng {
        font-size: 1.2rem;
        line-height: 1.5rem;
        padding-left: 10px !important;
    }

    .h3, .h3-eng {
        font-size: 0.9rem !important;
        line-height: 1.4rem !important;
        padding-left: 10px !important;
    }

    .h4 {
        font-size: 0.8rem !important;
        line-height: 0.6rem !important;
        padding-left: 20px !important;
    }

    .scrolling-text, .scrolling-text-eng {
        font-size: 0.9rem !important;
        line-height: 1.5rem !important;
        padding-left: 10px !important;
    }
}

@media (max-width: 480px) {
    .container-landing-page {
        max-width: 95%;
    }

    .container-inhaltserzeichnis {
        max-width: 95%;
    }

    .h1, .h1-eng {
        font-size: 2rem;
        font-weight: 900;
        line-height: 1.1;
        padding-left: 20px;
    }

    .h2, .h2-eng {
        font-size: 1rem !important;
        line-height: 1.3rem !important;
        padding-left: 5px !important;
    }

    .h3, .h3-eng {
        font-size: 0.8rem !important;
        line-height: 1.2rem !important;
        padding-left: 5px !important;
    }

    .h4 {
        font-size: 0.7rem !important;
        line-height: 0.5rem !important;
        padding-left: 10px !important;
    }

    .scrolling-text {
        font-size: 0.8rem !important;
        line-height: 1.3rem !important;
        padding-left: 5px !important;
    }
    
    /* Responsive nav buttons */
    .nav-buttons {
        left: 10px;
        top: 10px;
        gap: 5px;
    }
    
    #index-btn,
    #glossary-btn,
    #sources-btn,
    #download-btn {
        padding: 1px 8px;
        font-size: 10px;
    }
    
    #lang-btn {
        right: 10px;
        top: 12px;
        font-size: 12px;
    }
    
    .site-title {
        font-size: 0.7rem !important;
        top: 50px !important;
        padding-left: 10px !important;
    }
}

/* Popup tip for headphones message */
.popup-tip {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--black);
    padding: 10px 15px;
    border-radius: 15px;
    z-index: 1002;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: grab;
}

.popup-tip p {
    font-family: 'IBMPlexMono', monospace;
    font-size: 12px;
    font-style: italic;
    color: var(--green);
    margin: 0;
    white-space: nowrap;
}

.popup-close {
    background: none;
    border: none;
    color: var(--green);
    font-size: 18px;
    cursor: pointer;
    padding: 0 5px;
    line-height: 1;
}

.popup-close:hover {
    color: var(--white);
}

@keyframes fadeIn {
    0% { opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { opacity: 0; }
}

/* Mobile - responsive layout for small screens */
@media (max-width: 600px) {
    /* Hide mobile warning - show actual content */
    .mobile-warning {
        display: none !important;
    }
    
    /* Adjust body and html for mobile */
    html, body {
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
    }
    
    /* Navigation - stack vertically on mobile */
    nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: auto;
        min-height: 60px;
        background: linear-gradient(
            to bottom,
            var(--white) 0%,
            var(--white) 80%,
            rgba(255, 255, 255, 0) 100%
        );
        z-index: 1000;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        align-items: flex-start;
        padding: 10px;
        box-sizing: border-box;
    }
    
    /* Nav buttons - wrap and smaller */
    .nav-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 5px;
        position: relative;
        left: 0;
        top: 0;
        width: 100%;
    }
    
    /* Smaller nav buttons on mobile */
    #index-btn,
    #glossary-btn,
    #sources-btn,
    #download-btn,
    #lang-btn {
        padding: 4px 8px;
        font-size: 11px;
        line-height: 1.2;
    }
    
    /* Audio controls - smaller and inline */
    #play-pause-btn {
        width: 28px;
        height: 28px;
        font-size: 14px;
        margin-right: 10px;
        margin-top: 5px;
    }
    
    /* Hide sliders on mobile - completely remove from layout */
    .ui-slider {
        display: none !important;
        visibility: hidden !important;
        width: 0 !important;
        height: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        overflow: hidden !important;
    }
    
    /* Hide popup tip on mobile */
    .popup-tip {
        display: none !important;
        visibility: hidden !important;
    }
    
    /* Line numbers - smaller on mobile */
    .line-numbers {
        display: block !important;
        width: 30px;
        font-size: 10px;
        padding: 15px 0 5px 0;
    }
    
    .line-number {
        padding-right: 5px;
    }
    
    /* Adjust nav gradient */
    .nav-gradient {
        display: none;
    }
    
    /* Main content area */
    main {
        margin-top: 120px;
        padding: 0 10px;
    }
    
    .content-wrapper {
        padding: 0;
        transform: none !important;
    }
    
    /* Reading area - full width on mobile */
    #reading-area {
        padding-left: 30px;
        max-width: 100%;
        font-size: 14px;
        line-height: 1.5;
    }
    
    /* Headings - adjusted for mobile */
    .h1, .h1-eng {
        font-size: 1.8rem;
        font-weight: 900;
        line-height: 1.2;
        padding: 60px 10px 20px 30px;
        max-width: 100%;
    }
    
    .h2, .h2-eng {
        font-size: 1.1rem;
        line-height: 1.6;
        padding: 15px 10px 10px 10px;
        max-width: 100% !important;
    }
    
    .h3, .h3-eng {
        font-size: 0.95rem;
        line-height: 1.6;
        padding: 10px 10px 10px 15px;
        max-width: 100% !important;
    }
    
    .h4 {
        font-size: 0.85rem;
        line-height: 1.2;
        padding: 8px 10px 8px 20px;
        max-width: 100%;
    }
    
    /* Scrolling text - adjusted for mobile */
    .scrolling-text, .scrolling-text-eng {
        font-size: 0.9rem;
        line-height: 1.6;
        padding: 0 10px 25px 10px;
        max-width: 100%;
    }
    
    .scrolling-text-italic, .scrolling-text-italic-eng {
        font-size: 0.9rem;
        line-height: 1.5;
        padding: 0 10px 15px 10px;
        max-width: 100%;
    }
    
    /* Draggable images - adjust for mobile */
    .draggable {
        position: relative !important;
        width: 100% !important;
        height: auto !important;
        top: auto !important;
        left: auto !important;
        margin: 20px 0;
        cursor: default;
    }
    
    .draggable img {
        width: 100%;
        height: auto;
    }
    
    /* Hide resize handles on mobile */
    .resize-handle {
        display: none !important;
    }
    
    /* Image caption - full width on mobile */
    .draggable .image-caption {
        position: relative;
        bottom: auto;
        left: auto;
        right: auto;
        margin-top: 5px;
    }
    
    /* Specific image adjustments */
    .image-MH,
    .image-apollo-02,
    .image-apollo-04,
    .image-jscode,
    .image-punchcard,
    .image-eniac,
    .image-sketch-01,
    .image-sketch-02,
    .image-RS,
    .image-xerox,
    .image-github-01,
    .image-github-02,
    .image-linux {
        position: relative !important;
        width: 100% !important;
        height: auto !important;
        top: auto !important;
        left: auto !important;
        margin: 15px 0;
    }
    
    /* Sidebar adjustments for mobile */
    #index-sidebar,
    #glossary-sidebar,
    #sources-sidebar {
        width: 85%;
        max-width: 300px;
    }
    
    /* Increase line height for sidebar index text on mobile */
    #index-sidebar .h1-sidebar,
    #index-sidebar .h2,
    #index-sidebar .h3,
    #glossary-sidebar .h2,
    #glossary-sidebar .h3,
    #sources-sidebar .h2,
    #sources-sidebar .h3 {
        line-height: 1.7;
        padding-top: 10px;
        padding-bottom: 10px;
    }
    
    /* Popup tip - adjust for mobile */
    .popup-tip {
        top: auto;
        bottom: 20px;
        left: 10px;
        right: 10px;
        transform: none;
        width: auto;
        padding: 8px 12px;
    }
    
    .popup-tip p {
        font-size: 10px;
        white-space: normal;
    }
    
    /* Active section highlighting */
    #reading-area .h2.active-section,
    #reading-area .h3.active-section {
        color: var(--green);
    }
    
    /* Ensure content is visible */
    body > *:not(.mobile-warning) {
        display: block !important;
    }
    
    nav,
    #play-pause-btn,
    .ui-slider {
        display: flex !important;
    }
    
    /* Language visibility */
    .h1, .h2, .h3, .h4, .scrolling-text, .scrolling-text-italic {
        display: none;
    }
    
    body.english-mode .h1-eng, 
    body.english-mode .h2-eng, 
    body.english-mode .h3-eng, 
    body.english-mode .h4-eng, 
    body.english-mode .scrolling-text-eng, 
    body.english-mode .scrolling-text-italic-eng {
        display: block;
    }
    
    body.german-mode .h1, 
    body.german-mode .h2, 
    body.german-mode .h3, 
    body.german-mode .h4, 
    body.german-mode .scrolling-text, 
    body.german-mode .scrolling-text-italic {
        display: block;
    }
}