/* ========================================
   ENHANCED E-PAPER CSS FRAMEWORK
   Base: ePaperCSS by marcomattes
   Enhanced: Newton MessagePad-inspired design
   
   Features:
   - E-ink optimized (no anti-aliasing)
   - Light/dark theme support
   - Newton-style stippled backgrounds
   - Comprehensive component library
   - Grid & flexbox utilities
   - Responsive & print-friendly
   
   Theme: Toggle with data-theme="dark"
   Icons: SVG sprite in icons.svg
   ======================================== */

/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: grayscale;
}

body { margin: 0; }
main { display: block; }
h1 { font-size: 2em; margin: 0.67em 0; }
hr { box-sizing: content-box; height: 0; overflow: visible; }
pre { font-family: monospace, monospace; font-size: 1em; }
a { background-color: transparent; }
abbr[title] { border-bottom: none; text-decoration: underline; text-decoration: underline dotted; }
b, strong { font-weight: bolder; }
code, kbd, samp { font-family: monospace, monospace; font-size: 1em; }
small { font-size: 80%; }
sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }
sub { bottom: -0.25em; }
sup { top: -0.5em; }
img { border-style: none; }

button, input, optgroup, select, textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: 1.15;
  margin: 0;
}

button, input { overflow: visible; }
button, select { text-transform: none; }
button, [type="button"], [type="reset"], [type="submit"] { 
  -webkit-appearance: button;
  appearance: button;
}
button::-moz-focus-inner, [type="button"]::-moz-focus-inner, [type="reset"]::-moz-focus-inner, [type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}
button:-moz-focusring, [type="button"]:-moz-focusring, [type="reset"]:-moz-focusring, [type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

fieldset { padding: 0.35em 0.75em 0.625em; }
legend { box-sizing: border-box; color: inherit; display: table; max-width: 100%; padding: 0; white-space: normal; }
progress { vertical-align: baseline; }
textarea { overflow: auto; }
[type="checkbox"], [type="radio"] { box-sizing: border-box; padding: 0; }
[type="number"]::-webkit-inner-spin-button, [type="number"]::-webkit-outer-spin-button { height: auto; }
[type="search"] { 
  -webkit-appearance: textfield;
  appearance: textfield;
  outline-offset: -2px;
}
[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }
::-webkit-file-upload-button { -webkit-appearance: button; font: inherit; }
details { display: block; }
summary { display: list-item; }
template { display: none; }
[hidden] { display: none; }

/* ========================================
   CSS VARIABLES
   Design tokens for theming and consistency
   ======================================== */
:root {
  /* Base colors */
  --primary-color: black;
  --disabled-color: #999999;
  --placeholder-color: #666666;
  --border-size: 2px;
  
  /* Extended grayscale palette */
  --ink-000: #000000;
  --ink-100: #111111;
  --ink-200: #222222;
  --ink-300: #333333;
  --ink-400: #444444;
  --ink-500: #666666;
  --ink-600: #888888;
  --ink-700: #aaaaaa;
  --ink-800: #cccccc;
  --ink-900: #e8e8e8;
  --ink-white: #ffffff;
  
  /* Spacing scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  
  /* Font families */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: 'Courier New', Consolas, Monaco, monospace;
  
  /* Semantic colors */
  --bg-primary: #e8e8e8;
  --bg-secondary: #d0d0d0;
  --bg-inset: #ffffff;
  --bg-raised: #d0d0d0;
  --bg-stippled: 
    radial-gradient(circle at 1px 1px, rgba(0,0,0,0.08) 1px, transparent 0);
  --bg-stippled-size: 4px 4px;
  --text-primary: var(--ink-000);
  --text-secondary: var(--ink-500);
  --border-color: var(--ink-000);
  --shadow-inset: inset 1px 1px 2px rgba(0,0,0,0.15);
  --shadow-raised: 1px 1px 0 rgba(255,255,255,0.5);
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #2a2a2a;
  --bg-secondary: #3a3a3a;
  --bg-inset: #333333;
  --bg-raised: #404040;
  --bg-stippled: 
    radial-gradient(circle at 1px 1px, rgba(255,255,255,0.08) 1px, transparent 0);
  --bg-stippled-size: 4px 4px;
  --text-primary: var(--ink-white);
  --text-secondary: var(--ink-700);
  --border-color: var(--ink-600);
  --primary-color: #e0e0e0;
  --shadow-inset: inset 1px 1px 2px rgba(0,0,0,0.3);
  --shadow-raised: 1px 1px 0 rgba(255,255,255,0.1);
}

/* Font switching */
[data-font="sans"] body {
  font-family: var(--font-sans);
}

[data-font="serif"] body {
  font-family: var(--font-serif);
}

[data-font="mono"] body {
  font-family: var(--font-mono);
  font-weight: bold;
}

/* No caps mode */
.no-caps * {
  text-transform: lowercase !important;
}

/* ========================================
   BASE STYLES
   ======================================== */
body {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-md);
  color: var(--text-primary);
  background: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.01) 2px,
      rgba(0,0,0,0.01) 4px
    ),
    var(--bg-primary);
  background-attachment: fixed;
  font-family: var(--font-sans);
  line-height: 1.6;
}

/* ========================================
   WIDGETS & CONTAINERS
   Newton-style rounded corners and inset look
   ======================================== */
.widget {
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-inset);
  box-shadow: var(--shadow-inset);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.widget-dotted {
  background: var(--bg-stippled) var(--bg-raised);
  background-size: var(--bg-stippled-size);
  box-shadow: none;
}

/* Windows with headers (Newton-inspired panels) */
.window {
  border: 2px solid var(--border-color);
  background: var(--bg-inset);
  box-shadow: 2px 2px 4px rgba(0,0,0,0.1);
  border-radius: 6px;
  overflow: hidden;
}

.window-header {
  background: var(--bg-stippled) var(--bg-raised);
  background-size: var(--bg-stippled-size);
  border-bottom: 2px solid var(--border-color);
  padding: var(--space-sm) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.window-title {
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0;
}

.close-btn {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-color);
  background: var(--bg-inset);
  cursor: pointer;
  position: relative;
  padding: 0;
  min-width: 24px;
  border-radius: 3px;
}

.close-btn:before,
.close-btn:after {
  content: '';
  position: absolute;
  width: 14px;
  height: 2px;
  background: var(--border-color);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
}

.close-btn:after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.close-btn:active {
  box-shadow: var(--shadow-inset);
}

/* ========================================
   BUTTONS
   ======================================== */
button, .btn {
  border: 2px solid var(--primary-color);
  box-shadow: none;
  background: var(--bg-inset);
  color: var(--primary-color);
  padding: 0.5em 1em;
  font-family: inherit;
  font-size: 100%;
  text-decoration: none;
  cursor: pointer;
  display: inline-block;
  transition: none;
  border-radius: 4px;
  font-weight: 600;
}

button:hover, .btn:hover {
  background: var(--bg-raised);
  background-image: var(--bg-stippled);
  background-size: var(--bg-stippled-size);
}

button:focus, .btn:focus {
  outline: 0;
}

button:active, .btn:active {
  box-shadow: var(--shadow-inset);
}

button[disabled], .btn[disabled] {
  opacity: 0.5;
  box-shadow: none;
  border-color: var(--disabled-color);
  color: var(--disabled-color);
  cursor: not-allowed;
  background: var(--bg-raised);
}

.btn-small {
  padding: 0.35em 0.75em;
  font-size: 0.875em;
}

.btn-large {
  padding: 0.75em 1.5em;
  font-size: 1.125em;
}

/* ========================================
   FORMS
   Text inputs, checkboxes, radios, textareas, selects
   ======================================== */
fieldset {
  border-color: var(--primary-color);
}

/* Text Inputs */

input[type="email"],
input[type="text"],
input[type="password"],
input[type="tel"],
input[type="search"],
input[type="number"],
input[type="month"],
input[type="datetime-local"],
input[type="datetime"],
input[type="week"],
input[type="date"],
input[type="url"] {
  padding: 0.5em 1em;
  border-radius: 3px;
  border: 2px solid var(--border-color);
  background: var(--bg-inset);
  color: var(--text-primary);
  width: 100%;
  box-sizing: border-box;
  font-size: 1rem;
  box-shadow: var(--shadow-inset);
}

input::placeholder {
  letter-spacing: 0.1px;
  color: var(--placeholder-color);
}

input:focus {
  outline: 0;
  border: 2px solid var(--border-color);
}

/* Checkboxes (hidden native, styled with pseudo-elements) */
[type="checkbox"]:not(:checked):not(.toggle):not(.task-checkbox),
[type="checkbox"]:checked:not(.toggle):not(.task-checkbox) {
  position: absolute;
  left: -9999px;
}

[type="checkbox"]:not(:checked):not(.toggle):not(.task-checkbox) + label,
[type="checkbox"]:checked:not(.toggle):not(.task-checkbox) + label {
  position: relative;
  padding-left: 1.5em;
  cursor: pointer;
}

[type="checkbox"]:not(:checked):not(.toggle):not(.task-checkbox) + label:before,
[type="checkbox"]:checked:not(.toggle):not(.task-checkbox) + label:before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 1em;
  height: 1em;
  border: var(--border-size) solid var(--primary-color);
  background: var(--bg-primary);
  border-radius: 0;
}

[type="checkbox"]:not(:checked):not(.toggle):not(.task-checkbox) + label:after,
[type="checkbox"]:checked:not(.toggle):not(.task-checkbox) + label:after {
  content: '\2713\0020';
  position: absolute;
  top: 0.05em;
  left: 0.3em;
  font-size: 1em;
  line-height: 0.8;
  color: var(--primary-color);
  transition: none;
}

[type="checkbox"]:not(:checked):not(.toggle):not(.task-checkbox) + label:after {
  opacity: 0;
  transform: scale(0);
}

[type="checkbox"]:checked:not(.toggle):not(.task-checkbox) + label:after {
  opacity: 1;
  transform: scale(1);
}

[type="checkbox"]:disabled:not(:checked):not(.toggle):not(.task-checkbox) + label:before,
[type="checkbox"]:disabled:checked:not(.toggle):not(.task-checkbox) + label:before {
  box-shadow: none;
  border-color: var(--disabled-color);
  background-color: var(--disabled-color);
}

[type="checkbox"]:disabled:checked:not(.toggle):not(.task-checkbox) + label:after {
  color: var(--disabled-color);
}

[type="checkbox"]:disabled:not(.toggle):not(.task-checkbox) + label {
  color: var(--disabled-color);
}

[type="checkbox"]:checked:focus:not(.toggle):not(.task-checkbox) + label:before,
[type="checkbox"]:not(:checked):focus:not(.toggle):not(.task-checkbox) + label:before {
  border: var(--border-size) dotted var(--primary-color);
}

/* Task Checkboxes (visible, styled checkboxes for tasks) */
[type="checkbox"].task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 1.1em;
  height: 1.1em;
  border: var(--border-size) solid var(--primary-color);
  background: var(--bg-primary);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  margin: 0;
}

[type="checkbox"].task-checkbox:checked::before {
  content: '\2713';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--primary-color);
  font-size: 1em;
  line-height: 1;
}

[type="checkbox"].task-checkbox:hover {
  border-color: var(--primary-color);
  opacity: 0.8;
}

[type="checkbox"].task-checkbox:focus {
  outline: 2px dotted var(--primary-color);
  outline-offset: 2px;
}

/* Radio Buttons (hidden native, styled with pseudo-elements) */
[type="radio"]:checked,
[type="radio"]:not(:checked) {
  position: absolute;
  left: -9999px;
}

[type="radio"]:checked + label,
[type="radio"]:not(:checked) + label {
  position: relative;
  padding-left: 1.75em;
  cursor: pointer;
  line-height: 20px;
  display: inline-block;
  color: var(--text-primary);
}

[type="radio"]:checked + label:before,
[type="radio"]:not(:checked) + label:before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 1em;
  height: 1em;
  border: var(--border-size) solid var(--primary-color);
  background: var(--bg-primary);
  border-radius: 100%;
}

[type="radio"]:checked + label:after,
[type="radio"]:not(:checked) + label:after {
  content: '';
  width: 0.75em;
  height: 0.75em;
  background: var(--primary-color);
  position: absolute;
  top: 4px;
  left: 4px;
  border-radius: 100%;
}

[type="radio"]:not(:checked) + label:after {
  opacity: 0;
  transform: scale(0);
}

[type="radio"]:checked + label:after {
  opacity: 1;
  transform: scale(1);
}

[type="radio"]:disabled + label:before {
  border-color: var(--disabled-color);
}

[type="radio"]:disabled:checked + label:after {
  color: var(--disabled-color);
}

[type="radio"]:disabled + label {
  color: var(--disabled-color);
}

[type="radio"]:checked:focus + label:before,
[type="radio"]:not(:checked):focus + label:before {
  border: var(--border-size) dotted var(--primary-color);
}

/* Textareas */
textarea {
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  border-radius: 3px;
  padding: 0.5em;
  width: 100%;
  box-sizing: border-box;
  background: var(--bg-inset);
  font-family: monospace;
  min-height: 120px;
  resize: vertical;
  font-size: 1rem;
  box-shadow: var(--shadow-inset);
}

textarea::placeholder {
  letter-spacing: 0.1px;
  color: var(--placeholder-color);
}

textarea:focus {
  outline: 0;
}

textarea[disabled] {
  color: var(--disabled-color);
  border-color: var(--disabled-color);
}

/* Dashed input (Newton task list style) */
.input-dashed {
  border: none;
  border-bottom: 2px dashed var(--border-color);
  border-radius: 0;
  padding: var(--space-xs) 0;
  background: transparent;
  box-shadow: none;
}

.input-dashed:focus {
  border-bottom: 2px solid var(--border-color);
}

/* Select Dropdowns */
select {
  border: 2px solid var(--border-color);
  border-radius: 3px;
  padding: 0.5em 1em;
  background: var(--bg-inset);
  color: var(--text-primary);
  font-size: 1rem;
  box-shadow: var(--shadow-inset);
}

select:focus {
  outline: 0;
}

/* Form Labels */
label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

/* Date Badge - Compact display for dates */
.date-badge {
  display: inline-block;
  padding: 2px 8px;
  border: none;
  border-radius: 3px;
  background: transparent;
  color: var(--ink-000);
  font-size: 0.875rem;
  white-space: nowrap;
}

[data-theme="dark"] .date-badge {
  color: var(--ink-white);
}

/* Inline Date Input - Minimal styled date picker */
.date-input {
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--border-color);
  border-radius: 3px;
  background: var(--bg-inset);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: 'Courier New', monospace;
  box-shadow: var(--shadow-inset);
  cursor: pointer;
  width: 140px;
  box-sizing: border-box;
}

.date-input:focus {
  outline: 0;
  border-color: var(--text-primary);
}

.date-input::-webkit-calendar-picker-indicator {
  cursor: pointer;
  opacity: 0.6;
}

/* ========================================
   LISTS
   Default, bare, Newton-style, and task lists
   ======================================== */
li {
  padding-bottom: 0.6em;
}

ul.list--bare {
  padding: 0;
  margin: 0;
}

ul.list--bare li {
  list-style-type: none;
}

/* Numbered list with circled numbers (Newton-style) */
ol.list--newton {
  list-style: none;
  counter-reset: newton-counter;
  padding: 0;
  margin: 0;
}

ol.list--newton li {
  counter-increment: newton-counter;
  position: relative;
  padding-left: 2.5em;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 2px dashed var(--border-color);
  margin-bottom: 0;
  display: flex;
  align-items: center;
}

ol.list--newton li:last-child {
  border-bottom: none;
}

ol.list--newton li:before {
  content: counter(newton-counter);
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1.5em;
  height: 1.5em;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  background: var(--bg-inset);
  text-align: center;
  line-height: 1;
  box-shadow: var(--shadow-inset);
}

/* Task list (Newton "Now and Later" style) */
.task-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.task-list li {
  padding: var(--space-sm) 0;
  border-bottom: 2px dashed var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.task-list li:last-child {
  border-bottom: none;
}

/* ========================================
   TYPOGRAPHY
   Headings, paragraphs, code, blockquotes
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

code {
  font-family: monospace;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border: 2px solid var(--border-color);
  font-size: 0.9em;
}

pre {
  background: var(--bg-secondary);
  padding: var(--space-md);
  border: 2px solid var(--border-color);
  overflow-x: auto;
}

pre code {
  background: none;
  border: none;
  padding: 0;
}

blockquote {
  border-left: 2px solid var(--border-color);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* ========================================
   TABLES
   ======================================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

th, td {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 2px dashed var(--border-color);
}

th {
  font-weight: 700;
  background: var(--bg-stippled) var(--bg-secondary);
  background-size: var(--bg-stippled-size);
  border-bottom: 2px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

/* ========================================
   CARDS
   Bordered containers with titles
   ======================================== */
.card {
  background: var(--bg-inset);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-inset);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 var(--space-sm) 0;
  padding-bottom: var(--space-sm);
  border-bottom: 2px dashed var(--border-color);
}

.card-content {
  color: var(--text-primary);
}

/* ========================================
   LAYOUT CONTAINERS
   ======================================== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-md);
}

.container-narrow {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-md);
}

.container-wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md);
}

/* ========================================
   GRID SYSTEM
   ======================================== */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 { 
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 { 
  grid-template-columns: repeat(3, 1fr);
}
.grid-4 { 
  grid-template-columns: repeat(4, 1fr);
}
.grid-5 { 
  grid-template-columns: repeat(5, 1fr);
}

/* Force grid columns on all screen sizes - no responsive breakpoints */

/* ========================================
   FLEXBOX UTILITIES
   ======================================== */
.flex {
  display: flex;
  gap: var(--space-md);
}

.flex-center {
  justify-content: center;
  align-items: center;
}

.flex-between {
  justify-content: space-between;
  align-items: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

/* ========================================
   NAVIGATION BARS
   ======================================== */
.topbar {
  position: sticky;
  top: 0;
  background: var(--bg-primary);
  border-bottom: 2px solid var(--border-color);
  padding: var(--space-sm) var(--space-md);
  margin: calc(var(--space-md) * -1) calc(var(--space-md) * -1) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
}

.topbar-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0;
}

.topbar-actions {
  display: flex;
  gap: var(--space-sm);
}

.topbar-actions button {
  border-color: var(--border-color);
}

.statusbar {
  background: var(--bg-inset);
  border-top: 2px solid var(--border-color);
  padding: var(--space-sm) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  font-family: 'Courier New', monospace;
}

.statusbar-left {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.statusbar-right {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.statusbar-icon {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  background: var(--bg-inset);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  font-size: 0.75rem;
}

/* ========================================
   POPUP/MODAL
   ======================================== */
.popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 999;
  display: none;
}

.popup-overlay.active {
  display: block;
}

/* Prevent body scroll when popup is active */
body:has(.popup-overlay.active) {
  overflow: hidden;
}

/* Base popup styles (for menus/lists) */
.popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-inset);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  width: 90vw;
  max-width: 600px;
  max-height: 90vh;
  overflow: hidden;
  z-index: 1000;
  display: none;
  box-shadow: 3px 3px 8px rgba(0,0,0,0.25);
  box-sizing: border-box;
}

/* Larger popup for content/files */
.popup-file {
  max-width: 900px;
}

@media (min-width: 600px) {
  .popup {
    width: 85vw;
  }
}

@media (min-width: 900px) {
  .popup {
    width: 70vw;
  }
  .popup-file {
    width: 80vw;
  }
}

.popup.active {
  display: block;
}

.popup-header {
  padding: var(--space-md);
  background: var(--bg-stippled) var(--bg-secondary);
  background-size: var(--bg-stippled-size);
  border-bottom: 2px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.popup-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.popup-content {
  padding: 0;
  max-height: calc(90vh - 120px);
  overflow-y: auto;
  background: var(--bg-inset);
}

.popup-item {
  padding: var(--space-md);
  border-bottom: 1px dashed var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--bg-inset);
  transition: none;
}

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

.popup-item:hover {
  background: var(--bg-stippled) var(--bg-secondary);
  background-size: var(--bg-stippled-size);
}

.popup-item:active {
  box-shadow: var(--shadow-inset);
}

.popup-item.active {
  background: var(--bg-stippled) var(--bg-secondary);
  background-size: var(--bg-stippled-size);
  font-weight: 700;
}

.popup-item[data-number]::before {
  content: attr(data-number);
  width: 1.5em;
  height: 1.5em;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  background: var(--bg-inset);
  box-shadow: var(--shadow-inset);
  flex-shrink: 0;
}

.popup-footer {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-inset);
  border-top: 2px solid var(--border-color);
  font-size: 0.875rem;
  font-family: 'Courier New', monospace;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ========================================
   LOADING NOTIFICATION
   ======================================== */
.notification {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-inset);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  padding: var(--space-lg);
  text-align: center;
  z-index: 2000;
  box-shadow: 3px 3px 8px rgba(0,0,0,0.25);
  min-width: 250px;
  display: none;
}

.notification.active {
  display: block;
}

.notification-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 1999;
  display: none;
}

.notification-overlay.active {
  display: block;
}

.notification-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}

.notification-message {
  font-size: 0.9rem;
  color: var(--ink-600);
}

/* ========================================
   TABS
   ======================================== */
.tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: 0;
}

.tab {
  background: var(--bg-stippled) var(--bg-raised);
  background-size: var(--bg-stippled-size);
  border: 2px solid var(--border-color);
  border-bottom: none;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  position: relative;
  border-radius: 6px 6px 0 0;
}

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

.tab.active {
  background: var(--bg-inset);
  background-image: none;
  font-weight: 700;
  border-bottom: 2px solid var(--bg-inset);
  margin-bottom: -2px;
  z-index: 10;
}

.tab-content {
  display: none;
  border: 2px solid var(--border-color);
  border-radius: 0 6px 6px 6px;
  padding: var(--space-md);
  background: var(--bg-inset);
}

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

/* ========================================
   ICONS
   ======================================== */
.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: middle;
  fill: currentColor;
}

.icon-lg { width: 1.5em; height: 1.5em; }
.icon-xl { width: 2em; height: 2em; }
.icon-xxl { width: 3em; height: 3em; }
.icon-xxxl { width: 4em; height: 4em; }

/* ========================================
   UTILITY CLASSES
   Text, spacing, borders, display helpers
   ======================================== */

/* Text Alignment */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

/* Font Styles */
.font-mono { font-family: monospace; }

/* Text Sizes */
.text-sm { font-size: 0.875rem; }
.text-md { font-size: 1rem; }
.text-lg { font-size: 1.25rem; }
.text-xl { font-size: 1.5rem; }

/* Font Weights */
.bold { font-weight: 700; }
.normal { font-weight: 400; }

/* Text Colors */
.muted { color: var(--text-secondary); }

/* Margin Top */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

/* Margin Bottom */
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* Padding */
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }

/* Borders */
.border { border: 1px solid var(--border-color); }
.border-2 { border: 2px solid var(--border-color); }
.border-top { border-top: 1px solid var(--border-color); }
.border-bottom { border-bottom: 1px solid var(--border-color); }

/* Display Helpers */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* User Interaction */
.no-scroll {
  overflow: hidden;
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
}

/* Background Helpers */
.bg-stippled {
  background: var(--bg-stippled) var(--bg-raised);
  background-size: var(--bg-stippled-size);
}

/* ========================================
   TOGGLE SWITCHES
   Custom toggle switches (can be used anywhere)
   ======================================== */
.toggle {
  appearance: none;
  -webkit-appearance: none;
  display: inline-block;
  width: 50px;
  height: 26px;
  background: var(--bg-raised);
  border: 2px solid var(--border-color);
  border-radius: 13px;
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s, border-color 0.2s;
  vertical-align: middle;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.toggle::after {
  content: '';
  display: block;
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  background: var(--bg-inset);
  border: 2px solid var(--border-color);
  transition: left 0.2s ease, border-color 0.2s;
  box-shadow: 1px 1px 2px rgba(0,0,0,0.2);
  box-sizing: border-box;
}

.toggle:checked {
  background: var(--text-primary);
  border-color: var(--text-primary);
}

.toggle:checked::after {
  left: 26px;
  background: var(--bg-inset);
  border-color: var(--text-primary);
}

.toggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.toggle:focus {
  outline: 2px dotted var(--border-color);
  outline-offset: 2px;
}

/* ========================================
   CARD LAYOUT HELPERS
   Additional card utilities from production
   ======================================== */
.card-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-label {
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  width: 100%;
  font-weight: 500;
}

/* ========================================
   NEWTON-INSPIRED ENHANCEMENTS
   Sketch paper, embossed & pill buttons
   ======================================== */

/* 3D Embossed Buttons (Newton-style raised physical buttons) */
.btn-embossed, button.embossed {
  background: var(--bg-raised);
  border: 3px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 
    2px 2px 0 rgba(0,0,0,0.2),
    inset -1px -1px 0 rgba(0,0,0,0.1),
    inset 1px 1px 0 rgba(255,255,255,0.3);
  padding: 0.6em 1.2em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-embossed:hover, button.embossed:hover {
  background: var(--bg-stippled) var(--bg-raised);
  background-size: var(--bg-stippled-size);
}

.btn-embossed:active, button.embossed:active {
  box-shadow: 
    inset 1px 1px 3px rgba(0,0,0,0.3),
    inset -1px -1px 0 rgba(255,255,255,0.1);
  transform: translateY(1px);
}

/* Pill-shaped buttons */
.btn-pill {
  border-radius: 50px;
  padding: 0.5em 1.5em;
  border: 2px solid var(--border-color);
  background: var(--bg-raised);
  font-weight: 600;
  box-shadow: 1px 1px 3px rgba(0,0,0,0.1);
}

.btn-pill:active {
  box-shadow: inset 1px 1px 2px rgba(0,0,0,0.2);
}

/* Sketch/drawing paper texture */
.sketch-paper {
  background: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.02) 2px,
      rgba(0,0,0,0.02) 4px
    ),
    var(--bg-inset);
  border: 2px solid var(--border-color);
  padding: var(--space-md);
}

/* ========================================
   RESPONSIVE
   ======================================== */
/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
  * {
    background: white !important;
    color: black !important;
  }
  
  .no-print {
    display: none !important;
  }
}