/* === IMPORTS & ROOT VARIABLES === */
@import url('https://fonts.cdnfonts.com/css/jetbrains-mono-2');

:root {
  /* Typography & Base */
  --font-family: "JetBrains Mono", monospace;
  --font-size: 16px;
  --line-height: 1.20rem;
  --font-weight-normal: 500;
  --font-weight-medium: 600;
  --font-weight-bold: 800;
  
  /* Colors */
  --text-color: #000;
  --text-color-alt: #666;
  --background-color: #fff;
  --background-color-alt: #eee;

  /* Borders */
  --border-thickness: 2px;

  /* Root Font Application */
  font-family: var(--font-family);
  font-optical-sizing: auto;
  font-weight: var(--font-weight-normal);
  font-style: normal;
  font-variant-numeric: tabular-nums lining-nums;
  font-size: var(--font-size);
}

/* === DARK MODE VARIABLES === */
@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #fff;
    --text-color-alt: #aaa;
    --background-color: #000;
    --background-color-alt: #111;
  }
}

/* === GLOBAL & BASE STYLES === */
* {
  box-sizing: border-box;
}

html {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  background: var(--background-color);
  color: var(--text-color);
}

body {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 100vh;
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
}

/* === PAGE HEADER === */
.page-header {
  width: 100%; /* Ensure header takes full width for text-align */
  padding: var(--line-height) 0;
  margin-bottom: var(--line-height);
  text-align: center;
}

.page-title {
  margin: 0 0 calc(var(--line-height) / 2) 0;
  font-size: 2.5rem; /* Larger than other h1 for emphasis */
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  color: var(--text-color);
}

.page-subtitle {
  margin: 0;
  font-size: 0.9rem;
  font-weight: var(--font-weight-normal);
  color: var(--text-color-alt);
}

.page-subtitle a {
  text-decoration: underline;
  color: var(--text-color-alt);
}

.page-subtitle a:hover {
  color: var(--text-color);
}

/* === ACTION BUTTONS CONTAINER === */
#action-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1ch;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto var(--line-height) auto;
  padding: var(--line-height) 0;
}

#action-buttons input[type="file"] {
    display: none;
}

/* === LAYOUT CONTAINERS === */
.container {
  display: flex;
  flex-grow: 1;
  gap: 20px;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--line-height) 2ch;
}

.panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 300px; /* Ensures panels don't collapse too much */
  padding: 1ch;
  border: var(--border-thickness) solid var(--text-color-alt);
  border-radius: 0;
  background-color: var(--background-color-alt);
  box-shadow: none;
}

/* Specific Panel IDs - already simple, largely for flex control if needed */
/* #left-panel {} */
/* #right-panel {} */

/* === TOOLBAR === */
#toolbar {
  display: flex;
  flex-direction: column;
  gap: 0.5ch;
  margin-bottom: 1ch;
}

.toolbar-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5ch;
}

/* === BUTTONS (TOOLBAR & ACTION) === */
#toolbar button,
#action-buttons button,
#action-buttons label {
  padding: calc(var(--line-height) / 3) calc(1ch - var(--border-thickness) / 2);
  border: var(--border-thickness) solid var(--text-color-alt);
  border-radius: 0;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  color: var(--text-color);
  background-color: var(--background-color-alt);
  cursor: pointer;
}

#toolbar button:hover,
#action-buttons button:hover,
#action-buttons label:hover {
  color: var(--background-color-alt);
  background-color: var(--text-color-alt);
}

#toolbar button:focus,
#action-buttons button:focus,
#action-buttons label:focus {
  outline: var(--border-thickness) solid var(--text-color);
  outline-offset: var(--border-thickness);
}

/* === MARKDOWN INPUT AREA === */
#md-input {
  width: 100%;
  height: calc(100vh - 250px);
  min-height: 200px;
  padding: 1ch;
  margin:0; /* Explicitly remove potential default margins */
  border: var(--border-thickness) solid var(--text-color-alt);
  border-radius: 0;
  box-sizing: border-box;
  font-family: var(--font-family);
  font-size: 1rem;
  color: var(--text-color);
  background-color: var(--background-color);
  resize: vertical;
}

#md-input::placeholder {
  color: var(--text-color-alt);
}

/* === PREVIEW TABS === */
#tab-buttons {
  display: flex;
  margin-bottom: 1ch;
  border-bottom: var(--border-thickness) solid var(--text-color-alt);
}

#tab-buttons button {
  padding: 0.5ch 1ch;
  margin-right: 0.5ch;
  border: none;
  border-bottom: calc(var(--border-thickness) * 2) solid transparent;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  color: var(--text-color-alt);
  background-color: transparent;
  cursor: pointer;
}

#tab-buttons button.active {
  border-bottom-color: var(--text-color);
  font-weight: var(--font-weight-bold);
  color: var(--text-color);
}

/* === PREVIEW CONTENT AREA === */
#preview-content {
  flex-grow: 1;
  height: calc(100vh - 250px);
  min-height: 200px; 
  padding: 1ch;
  border: var(--border-thickness) solid var(--text-color-alt);
  border-radius: 0;
  background-color: var(--background-color);
  overflow: auto;
}

/* Rendered HTML Preview Styles */
#rendered-html-view {
  font-family: var(--font-family);
  color: var(--text-color);
  word-wrap: break-word;
}

#rendered-html-view h1,
#rendered-html-view h2,
#rendered-html-view h3,
#rendered-html-view h4 {
  margin: calc(var(--line-height) * 1.5) 0 var(--line-height);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height);
  color: var(--text-color);
}
#rendered-html-view h1 { font-size: 1.8rem; text-transform: uppercase; }
#rendered-html-view h2 { font-size: 1.4rem; text-transform: uppercase; }
#rendered-html-view h3 { font-size: 1.2rem; text-transform: uppercase; }
#rendered-html-view h4 { font-size: 1rem; text-transform: uppercase; }

#rendered-html-view p { 
  margin-top: 0; 
  margin-bottom: var(--line-height); 
  line-height: var(--line-height); 
  color: var(--text-color);
}

#rendered-html-view ul,
#rendered-html-view ol { 
  margin-bottom: var(--line-height); 
  padding-left: 2ch; 
  color: var(--text-color);
}

#rendered-html-view blockquote { 
  margin-left: 0; 
  margin-bottom: var(--line-height);
  padding-left: 1ch; 
  border-left: calc(var(--border-thickness) * 2) solid var(--text-color-alt); 
  font-style: italic; 
  color: var(--text-color-alt);
}

#rendered-html-view pre {
  margin: var(--line-height) 0; /* Added consistent margin like other block elements */
  padding: 1ch;
  border: var(--border-thickness) solid var(--text-color-alt);
  border-radius: 0;
  color: var(--text-color);
  background-color: var(--background-color-alt);
  overflow-x: auto;
}

#rendered-html-view code {
  font-family: var(--font-family);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
}

#rendered-html-view code:not(pre code) {
  padding: 0.2ch 0.4ch;
  border-radius: 0;
  background-color: var(--background-color-alt);
}

#rendered-html-view a {
  text-decoration: underline;
  text-decoration-thickness: var(--border-thickness);
  color: var(--text-color);
}

#rendered-html-view a:hover {
  text-decoration: underline;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: #000;
    margin-bottom: 1rem;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Raw HTML Preview Styles */
#raw-html-view {
  font-family: var(--font-family);
  font-size: 0.9rem;
  color: var(--text-color-alt);
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* === UTILITY CLASSES === */
.hidden {
  display: none !important;
}

/* === RESPONSIVE ADJUSTMENTS === */
@media screen and (max-width: 768px) {
  .container {
    flex-direction: column;
    padding: var(--line-height) 1ch;
  }

  #md-input,
  #preview-content {
    height: 30vh;
    min-height: 150px;
  }

  #action-buttons {
    padding: var(--line-height) 0;
  }

  /* Example: Optionally reduce root font size on smaller screens 
  :root {
    font-size: 14px;
  }
  */
}