/* 
  Main color and sizing variables.
  Change these for global color and sizing adjustments.
*/

html {
  overflow-y: scroll;
}

.main-banner {
  position: relative;
}

.banner-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1800px;
  margin: 0 auto;
  padding: 0.5rem 1.5rem 0.5rem 1rem;
}

.banner-logo {
  height: 30px;
  margin-right: 2rem;
}

.banner-nav {
  display: flex;
  gap: 2rem;
  flex: 1;
  justify-content: center;
}

/* =============================================
   THEME VARIABLES (edit here for global styling)
   ============================================= */
:root {
  /* Base / page */
  --color-bg-page: #ffffff; /* Body background (body) */
  --color-text-primary: #111; /* Main text (#description-box headings, labels, outputs) */
  --color-text-secondary: #333; /* Paragraphs, helper text */
  --color-text-inverse: #ffffff; /* Rare inverse (legacy dark spots) */

  /* Surfaces / containers */
  --color-surface: #ffffff; /* Calculator cards (.container.center-fields, .description-box, .bandwidth-card, video/dphy wrappers) */
  --color-surface-accent: #fefbe8; /* Highlight surface (outputs-section) */

  /* Borders */
  --color-border-subtle: rgba(
    0,
    0,
    0,
    0.08
  ); /* Light subtle border for separation */
  --color-border-output: #e8d780; /* Border for outputs-section */
  --container-border: 0; /* Set to 0 (no border) OR e.g. 1px solid #fff (white) OR 1px solid #e0e0e0 for subtle frame */

  /* Inputs */
  --color-input-bg: #ffffff; /* Input background */
  --color-input-border: #000000; /* Default input border */
  --color-input-focus: #ffd600; /* Input focus outline & border */
  --color-input-text: #333333; /* Input text color */

  /* Accent / semantic */
  --color-accent: #209dd8; /* Primary accent (buttons, hover fills) */
  --color-accent-hover: #3eabde; /* Hover state for accent elements */
  --color-error: #e53935; /* Validation errors */

  /* Tables */
  --color-table-header: #e6e6e6; /* Header background (D-PHY tables) */
  --color-table-stripe: #f2f2f2; /* Even row background */

  /* Typography & motion */
  --font-family-base: "Segoe UI", Arial, sans-serif;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Radius scale */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 18px;

  /* Unified input & form label color */
  --color-label-input: var(--color-text-secondary);

  /* Legacy variable aliases (kept for now to avoid refactoring every rule) */
  --bg: var(--color-bg-page);
  --text: var(--color-text-secondary);
  --label-color: var(--color-text-secondary);
  --dropdown-text-color: var(--color-text-primary);
  --input-label-color: var(--color-text-secondary); /* Legacy */
  --dropdown-label-color: var(--color-text-secondary); /* Legacy */
  --instructions-text-color: var(
    --color-text-secondary
  ); /* Unused; safe to remove when purged */
  --output-text-color: var(
    --color-text-primary
  ); /* Unused direct; outputs now inherit */
  --input-bg: var(--color-input-bg);
  --input-border: var(--color-input-border);
  --input-focus: var(--color-input-focus);
  --output-bg: var(--color-surface-accent);
  --output-border: var(--color-border-output);
  --output-label: var(--color-text-primary);
  --output-value: var(--color-text-primary);
  --accent: var(--color-accent);
  --shadow: none; /* Shadows removed per design */
  --transition: var(--transition-base);
  --error: var(--color-error);
}

/* LABELS (dropdown + standard) */
.field-group label,
#mode-row label,
#device-row label,
#package-row label,
#speed-row label {
  color: var(--color-label-input);
}

/* Override legacy duplicated label styling */
.field-group label {
  color: var(--color-label-input) !important;
}

.video-timing-bg-container .field-group label {
  color: var(--color-label-input) !important;
}

.apb-register .field-group label {
  color: var(--color-label-input) !important;
}

/* Line rate range reminder color */
#line-rate-reminder {
  color: var(--color-text-secondary) !important;
}

/* Dropdown / input text color */
select,
input[type="number"],
input[type="text"] {
  color: var(--color-text-primary);
}

/* Custom styling for dropdown options */
select option {
  background-color: #333333;
  color: #ffffff;
}

/* Custom styling for dropdown options on hover */
select option:hover,
select option:focus,
select option:active,
select option:checked {
  background-color: #6c6c6c !important;
  color: #ffffff !important;
}

/* Instructions & description text */
.instructions-block,
.description-box .desc-text,
.description-box {
  color: var(--color-text-secondary);
}

/* (Old block forcing white output text removed; outputs inherit later rules) */

body {
  background: var(--color-bg-page);
  background-size: cover;
  color: var(--color-text-secondary);
  font-family: var(--font-family-base);
  margin: 0;
  min-height: 100vh;
  display: block;
  font-size: 0.85rem;
}

/* Navigation button styling */

.top-nav .nav-link {
  color: #fff; /* White font by default */
  text-decoration: none;
  font-weight: 600;
  font-size: 1.08em;
  padding: 0.3rem 1.2rem;
  border-radius: 0.4rem;
  transition: color 0.18s ease;
  background: transparent !important; /* No background */
  border-bottom: none !important; /* No border bottom */
}

/* Grey text on hover, no background change */
.top-nav .nav-link:hover,
.top-nav .nav-link:focus {
  color: #aaaaaa !important; /* Grey font on hover */
  background: transparent !important; /* No background */
  border-bottom: none !important; /* No border */
}

/* Active page indicator - yellow line under the specific nav button */
.top-nav .nav-link.active {
  position: relative;
  color: #fff !important; /* Keep active link white */
  background: transparent !important; /* No background */
}

/* Yellow line under the active button */
.top-nav .nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 3px;
  background-color: #ffd600;
  display: block;
}

/* Keep the bottom yellow line for the entire navigation bar */
.top-nav::after,
.main-nav::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: #ffd600; /* Yellow line */
  z-index: 5;
  border-radius: 0 0 6px 6px;
  pointer-events: none;
}

/* Navigation responsive styles */
.top-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

/* Responsive navigation bar */
@media (max-width: 1200px) {
  .banner-content {
    padding: 0.5rem 1rem 0.5rem 0.8rem;
  }

  .banner-logo {
    height: 28px;
    margin-right: 1.5rem;
  }

  .top-nav .nav-link {
    font-size: 1em;
    padding: 0.3rem 1rem;
  }
}

@media (max-width: 900px) {
  .banner-content {
    padding: 0.5rem 0.8rem 0.5rem 0.6rem;
    flex-wrap: wrap;
  }

  .banner-content > div {
    width: 100%;
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .banner-logo {
    height: 26px;
    margin-right: 1rem;
  }

  .top-nav {
    gap: 0.4rem;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .top-nav .nav-link {
    font-size: 0.95em;
    padding: 0.25rem 0.8rem;
  }
}

@media (max-width: 768px) {
  .banner-content {
    padding: 0.4rem 0.6rem 0.4rem 0.5rem;
  }

  .banner-logo {
    height: 24px;
    margin-right: 0.8rem;
  }

  .top-nav {
    gap: 0.3rem;
  }

  .top-nav .nav-link {
    font-size: 0.9em;
    padding: 0.25rem 0.6rem;
  }
}

@media (max-width: 600px) {
  .banner-content {
    padding: 0.4rem 0.5rem 0.4rem 0.4rem;
  }

  .banner-content > div {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0.5rem;
  }

  .banner-logo {
    height: 22px;
    margin-right: 0;
    margin-bottom: 0.3rem;
  }

  .top-nav {
    width: 100%;
    justify-content: flex-start;
    gap: 0.3rem;
    flex-wrap: wrap;
  }

  .top-nav .nav-link {
    font-size: 0.85em;
    padding: 0.2rem 0.5rem;
  }
}

@media (max-width: 480px) {
  .banner-content {
    padding: 0.3rem 0.4rem 0.3rem 0.3rem;
  }

  .banner-logo {
    height: 20px;
  }

  .top-nav {
    gap: 0.2rem;
  }

  .top-nav .nav-link {
    font-size: 0.8em;
    padding: 0.2rem 0.4rem;
  }
}

.description-box {
  position: static;
  max-width: 320px;
  min-width: 220px;
  margin-bottom: 0.7rem;
  margin-left: 0;
  font-weight: bold;
  font-size: 1.1em;
  flex: 0 1 320px;
}

/* Table description box on the right */
.main-content-row .description-box:last-child {
  min-width: 260px;
  max-width: 350px;
  flex: 0 1 350px;
}

.table-border {
  border-collapse: collapse;
  width: 100%;
  font-weight: normal;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.table-border td,
.table-border th {
  border: 1px solid #888;
  padding: 0.5rem;
  text-align: center;
}

/* Main container for all fields and outputs */
.container {
  display: flex;
  flex-direction: row;
  /* Change to column for vertical layout */
  gap: 1.2rem;
  /* Space between columns */
  background: var(--input-bg);
  border-radius: 0.7rem;
  box-shadow: var(--shadow);
  padding: 1.2rem 1.2rem;
  /* Container padding */
  margin-top: 50rem;
  /* Center horizontally */
  transition: background var(--transition), box-shadow var(--transition);
  align-items: center;
  max-width: 600px;
  /* Change for wider/narrower container */
  width: 100%;
}

.container.center-fields {
  justify-content: center;
  align-items: center;
  transition: justify-content var(--transition), align-items var(--transition),
    padding var(--transition);
  padding-top: 2rem;
  padding-bottom: 2rem;
}

/* Wrapper for input fields */
.input-fields-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 250px;
  position: relative;
}

/* Section containing both columns */
.fields-section {
  flex: 1 1 auto;
  display: flex;
  gap: 3.5rem;
  /* Space between columns */
}

/* Each column of fields */
.fields-col {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1 1 0;
  min-width: 0;
}

.fields-col:first-child {
  margin-top: 0rem;
}

.fields-col:last-child {
  margin-top: 0rem;
}

.index-bg-container .fields-col:first-child {
  margin-top: -0.1rem;
  margin-right: -5rem;
}

.index-bg-container .fields-col:last-child {
  margin-top: 0rem;
}

/* Button row under Number of Gear (desktop) */
.fields-col .button-row {
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
  align-items: flex-end;
  margin-top: 0.7rem;
  padding-top: 0;
}

/* Hide right column button-row on desktop */
.fields-col:last-child .button-row {
  display: none;
}

/* Output section styles */
.outputs-section {
  margin: auto;
  display: block;
  max-width: 320px;
  width: 100%;
  padding: 1.5rem;
  background-color: #fefbe8;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(30px);
  transition: opacity var(--transition), visibility var(--transition),
    transform var(--transition);
}

.outputs-section.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(0);
  animation: slideInFromRight 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInFromRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.outputs-section.hiding {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(30px);
  transition: opacity var(--transition), visibility var(--transition),
    transform var(--transition);
}

.container.center-fields {
  background: linear-gradient(to bottom right, #000000, #363636 80%);
}

.output-group span,
#bandwidth-output {
  color: #fff !important;
  /* or another color that contrasts your background */
  font-size: 1.2em;
  font-weight: bold;
}

.output-label {
  font-weight: 600;
  color: var(--output-label);
  font-size: 0.92em;
  margin-bottom: 0.1rem;
  letter-spacing: 0.03em;
  transition: color var(--transition);
}

.output-value {
  color: var(--output-value);
  font-size: 0.92em;
  word-break: break-all;
  transition: color var(--transition);
}

.video-timing-container .output-group span,
.video-timing-container .output-value {
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 1.2em;
  font-weight: bold;
  color: #000000 !important;
  /* or use var(--output-value) for theme support */
}

/* Field group (label + input) */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.field-group input[type="text"],
.field-group input[type="number"],
.field-group select {
  padding: 0.35rem 0.7rem;
  /* Input padding */
  border: 2px solid var(--input-border);
  border-radius: 0.4rem;
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.92em;
  transition: border-color var(--transition), box-shadow var(--transition),
    background var(--transition), color var(--transition);
  outline: none;
  box-shadow: 0 2px 8px rgba(255, 221, 51, 0.04);
  width: 160px;
  /* Input width, change for wider/narrower fields */
  max-width: 160px;
  box-sizing: border-box;
}

/* General standardize input heights */
input[type="number"],
input[type="text"],
select {
  height: 2rem;
  line-height: 2rem;
  padding: 0 0.75rem;
  box-sizing: border-box;
}

/* Standardize input heights and widths for Video Timing Calculator */
.video-timing-bg-container input[type="number"],
.video-timing-bg-container input[type="text"],
.video-timing-bg-container select {
  height: 2rem;
  width: 235px;
  line-height: 2rem;
  padding: 0 0.75rem;
  box-sizing: border-box;
}

/* Error and highlight styles */
.field-group input[type="number"] {
  width: 100%;
  padding: 0.5rem 0.7rem;
  border: 2px solid var(--color-input-border);
  border-radius: 0.4rem;
  background: var(--color-input-bg);
  color: var(--color-input-text);
  font-size: 1em;
  outline: none;
  transition: border-color 0.2s;
}

.field-group input[type="text"].error,
.field-group input[type="number"].error,
.field-group select.error {
  border-color: var(--error);
}

@keyframes inputHighlight {
  0% {
    box-shadow: 0 0 0 0 #e5393533;
  }

  50% {
    box-shadow: 0 0 0 6px #e5393533;
  }

  100% {
    box-shadow: 0 0 0 0 #e5393533;
  }
}

input[type="text"].highlight,
input[type="number"].highlight,
select.highlight {
  animation: inputHighlight 0.7s;
}

.error-message {
  color: var(--error);
  font-size: 0.7em;
  font-style: italic;
  margin-top: 0.00001rem;
  min-height: 1.1em;
  transition: opacity var(--transition);
  opacity: 0;
  pointer-events: none;
}

.error-message.active {
  opacity: 1;
  pointer-events: auto;
}

.field-group input[type="text"]:focus,
.field-group input[type="number"]:focus,
.field-group select:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 2px var(--accent);
}

/* Button styles */
.button-row {
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
  align-items: flex-end;
  margin-top: 0.7rem;
  padding-top: 0;
}

.action-btn {
  background: #ffdd33;
  color: #232426;
  border: none;
  border-radius: 0.4rem;
  padding: 0.6rem 1.5rem;
  font-size: 1.1em;
  font-weight: bold;
  margin-right: 1rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  box-shadow: 0 2px 8px rgba(255, 221, 51, 0.08);
}

/* Button hover styles */
button#calculateButton:hover,
button#clearButton:hover,
.action-btn:hover,
#calc-p2b-btn:hover,
#calculate-btn:hover,
#clear-btn:hover,
button[type="button"]:hover,
input[type="button"]:hover,
.button-row button:hover {
  background-color: #3eabde !important; /* Lighter blue on hover */
  color: #ffffff !important; /* Keep text white */
  transform: translateY(-2px) scale(1.05);
}

/* Scroll to top button */
.scroll-top-btn {
  position: fixed;
  bottom: 1.2rem;
  right: 1.2rem;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: none;
  background: var(--input-bg);
  color: var(--accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  z-index: 100;
  transition: background var(--transition), color var(--transition),
    opacity var(--transition), box-shadow var(--transition),
    transform var(--transition);
}

.scroll-top-btn:hover {
  background: var(--accent);
  color: var(--text);
  transform: scale(1.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
}

/*Bandwidth Calculator*/
/* Card-like container for the calculator */

.bandwidth-card {
  max-width: 420px;
  margin: 3rem auto 2rem auto;
  margin-top: 5.5rem;
  background: linear-gradient(to bottom right, #232426, #2c2f33);
  border-radius: 20px;
  padding: 2.5rem 2rem 2rem 2rem;
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Center the form fields vertically */
.bandwidth-fields {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  width: 100%;
  align-items: center;
}

/* Field group styling */
.bandwidth-fields .field-group {
  width: 200px;
  max-width: 320px;
  align-items: center;
}

/* Button row centered */
.bandwidth-buttons {
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  margin-top: 2rem;
}

.container {
  max-width: 1100px;
  margin: 2rem auto;
  background: #232426;
  border-radius: 20px;
  padding: 2rem;
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
}

/*Instructions, input field, output field alignment for Video Timing Calculator*/

.flex-row {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.main-flex-row {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: flex-start;
  /* Align items to the left */
  margin-top: 0;
}

.video-timing-container {
  background: var(--input-bg);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
  margin: 0;
  margin-right: 100px;
  display: flex;
  gap: 4rem;
  /* space between form and output */
  align-items: flex-start;
  margin-left: 100px;
  max-width: 2000px;
}

.form-block {
  flex: 1 1 0;
  min-width: 280px;
  max-width: 100%;
}

#outputSection {
  flex: 1 1 320px;
  /* Allow to grow/shrink, set min width */
  min-width: 300px;
  max-width: 100%;
}

.instructions-block {
  max-width: 400px;
  /* or any value you prefer */
  width: 100%;
  /* or set a fixed width like 350px */
  background: var(--input-bg);
  color: var(--text);
  padding: 2rem 1.5rem;
  border-radius: 10px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  margin-bottom: 0;
}

body.light .video-timing-container .output-group span,
body.light .video-timing-container .output-value,
body.light .video-timing-container #bandwidth-output,
body.light .video-timing-container #b2p-bandwidth-output,
body.light .video-timing-container #bitsclock-output {
  color: #232426 !important;
}

/*Input styling for Video Timing Calculator*/

.video-timing-container .form-group {
  display: flex;
  flex-direction: row;
  align-items: center;
  margin-bottom: 0.6rem;
}

.video-timing-bg-container label,
.video-timing-bg-container .field-group label {
  font-size: 0.92em;
  /* smaller label font */
  margin-bottom: 0.15rem;
  margin-right: 0.5rem;
  /* space between label and input */
  min-width: 140px;
  /* adjust as needed for alignment */
  text-align: left;
  /* optional: right-align label text */
  color: var(--color-label-input) !important;
}

.video-timing-container input[type="number"],
.video-timing-container input[type="text"],
.video-timing-container select {
  font-size: 0.92em;
  /* smaller input font */
  padding: 0.3rem 0.5rem;
  /* less padding */
  width: 220px;
  /* narrower input box */
  max-width: 1000px;
  box-sizing: border-box;
}

.video-timing-container #bitsPerPixel {
  background: #e0e0e0 !important;
  color: #232426 !important;
}

.form-group {
  margin-bottom: 1.2rem;
  display: flex;
  flex-direction: column;
}

label {
  margin-bottom: 0.3rem;
  font-weight: 500;
  color: var(--text);
  /* or your preferred color */
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid #444;
  border-radius: 4px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
  transition: border-color 0.2s;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  border-color: var(--input-focus);
  outline: none;
}

button#calculateButton,
button#clearButton,
.action-btn,
#calc-p2b-btn,
#calculate-btn,
#clear-btn,
button[type="button"],
input[type="button"],
.button-row button {
  background-color: #209dd8 !important; /* Blue background */
  color: #ffffff !important; /* White text */
  border: none !important;
  padding: 10px 20px;
  font-size: 16px;
  font-weight: bold;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

/* Field label and input styling */
.field-group label {
  display: block;
  font-weight: 600;
  color: var(--color-label-input);
  margin-bottom: 0.3rem;
  font-size: 1em;
}

/* Tooltip styling */
.tooltip-container {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.tooltip-icon {
  display: inline-block;
  margin-left: 6px;
  font-size: 0.9em;
  color: var(--input-border);
  cursor: help;
}

.tooltip-text {
  visibility: hidden;
  width: 350px;
  background-color: var(--input-bg);
  color: var(--text);
  text-align: left;
  border-radius: 6px;
  padding: 12px;
  border: 1px solid var(--accent);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);

  /* Position the tooltip */
  position: absolute;
  z-index: 10;
  top: 100%;
  left: 0;
  margin-top: 5px;

  /* Typography */
  font-weight: normal;
  font-size: 0.9em;
  line-height: 1.4;

  /* Fade in animation */
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip-text ul {
  margin: 8px 0 0 0;
  padding-left: 20px;
}

.tooltip-text li {
  margin-bottom: 8px;
}

/* Show the tooltip on hover */
.tooltip-container:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

/* Output group styling */
.bandwidth-output-group {
  width: 100%;
  max-width: 320px;
  margin: 1.5rem auto 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#bandwidth-output,
#b2p-bandwidth-output,
#bitsclock-output {
  color: #fff;
  font-size: 1.2em;
  font-weight: bold;
  margin-top: 0.3rem;
  min-height: 1.5em;
  text-align: center;
}

#b2p-bandwidth-output {
  color: black !important;
}

#calc-p2b-btn:hover,
.clear-btn:hover {
  background: #fff700;
  color: #232426;
}

/* Responsive adjustments */
@media (max-width: 700px) {
  #input-to-p2b-section {
    flex-direction: column;
    gap: 0.5rem;
  }

  .output-group {
    margin-top: 0.5rem;
  }
}

/* Responsive: vertical layout for mobile/tablet */
@media (max-width: 900px) {
  .container {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    padding: 0.7rem 0.3rem;
    margin-top: 0.5rem;
    max-width: 98vw;
  }

  .fields-section {
    flex-direction: column;
    gap: 0.2rem;
  }

  .fields-col .button-row {
    display: none;
  }

  .fields-col:last-child .button-row {
    display: flex;
    gap: 1rem;
    justify-content: flex-start;
    align-items: flex-end;
    margin-top: 0.7rem;
    padding-top: 0;
  }

  .fields-col:last-child {
    margin-top: 0;
    /* Remove negative margin on mobile */
  }
}

/* Extra small screens */
@media (max-width: 600px) {
  .container {
    padding: 0.3rem 0.1rem;
    border-radius: 0.5rem;
  }

  .field-group input[type="text"],
  .field-group input[type="number"],
  .field-group select {
    font-size: 0.85em;
    padding: 0.4rem 0.5rem;
    width: 98vw;
    max-width: 98vw;
  }

  .output-group {
    font-size: 0.85em;
    padding: 0.4rem 0.5rem;
  }
}

/* Always-dark banner and navigation */
.main-banner,
.banner-content,
.banner-nav,
.banner-underline {
  background: #232426 !important;
  color: #fffde7 !important;
}

.banner-logo {
  filter: none !important;
}

.banner-link,
.banner-link:visited {
  color: #fffde7 !important;
}

.banner-link.active,
.banner-link:hover {
  background: #ffd600 !important;
  color: #232426 !important;
}

.banner-underline {
  background: #ffd600 !important;
}

.main-banner,
.banner-content,
.banner-nav,
.banner-underline,
.top-nav,
.main-nav {
  background: #333333 !important; /* Grey background */
  color: #fffde7 !important; /* Light text color */
}

/* Resize the .top-nav */
.top-nav {
  height: 22px;
  /* Adjust the height */
  padding: 0.5rem 2rem;
  /* Adjust the padding */
  font-size: 1rem;
  /* Adjust the font size of the text */
  max-width: 1500px;
  /* Optional: Set a maximum width */
  margin: 0 auto;
  /* Center it horizontally */
}

.nav-link,
.nav-link:visited {
  color: #fffde7 !important;
}

.nav-link.active,
.nav-link:hover {
  background: #ffd600 !important;
  color: #232426 !important;
}

/* Light mode: force white backgrounds for main container and fields */

body.light .container,
body.light .bandwidth-card {
  background: #fff !important;
  color: #111 !important;
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.08);
}

body.light .field-group input[type="text"],
body.light .field-group input[type="number"],
body.light .field-group select {
  background: #fff !important;
  color: #000 !important;
  border-color: #000 !important;
}

body.light .field-group label,
body.light .output-label {
  color: var(--text);
}

body.light #bandwidth-output,
body.light #bitsclock-output,
body.light #b2p-bandwidth-output {
  color: #000 !important;
}

/* Light mode: output container background for config.html */
body.light #bandwidth-output,
body.light .output-container {
  background: #fffde7 !important;
  /* or another light color for contrast */
  color: #232426 !important;
  /* ensure text is readable */
  border-color: #ffe066 !important;
}

.mode-selector {
  display: flex;
  margin-top: 1.6rem;
  margin-bottom: 2rem;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  position: absolute;
  top: 8%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin-bottom: auto;
  z-index: auto;
}

.mode-selector label {
  font-size: 1rem;
  /* Adjust label font size */
  font-weight: bold;
  /* Make the label bold */
  color: var(--text);
  /* Use theme text color */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.5rem;
  height: 100%;
}

.mode-selector select {
  width: 100%;
  /* Make the dropdown full width */
  padding: 0.5rem;
  /* Add padding inside the dropdown */
  border: 2px solid var(--input-border);
  /* Add border */
  border-radius: 0.4rem;
  /* Round the corners */
  background: var(--input-bg);
  /* Use theme background color */
  color: var(--text);
  /* Use theme text color */
  font-size: 1rem;
  /* Adjust font size */
}

/* APB Register Configuration page styles */
.apb-register .container {
  max-width: 900px;
  margin: 2.5rem auto 0 auto;
  background: var(--input-bg);
  border-radius: 0.7rem;
  box-shadow: var(--shadow);
  padding: 2rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.apb-register .fields-section {
  display: flex;
  gap: 2rem;
  width: 100%;
  justify-content: center;
}

.apb-register .fields-col {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.apb-register .field-group input[type="number"] {
  width: 100%;
  padding: 0.4rem 0.7rem;
  border: 2px solid var(--input-border);
  border-radius: 0.4rem;
  background: var(--input-bg);
  color: var(--text);
  font-size: 1em;
  outline: none;
  transition: border-color 0.2s;
}

.apb-register .field-group input[type="number"]:focus {
  border-color: var(--input-focus);
}

.apb-register .button-row {
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
  align-items: flex-end;
  margin-top: 1.2rem;
}

.apb-register .outputs-section {
  margin-top: 2rem;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.apb-register .output-group {
  background: var(--output-bg);
  border: 2px solid var(--output-border);
  border-radius: 0.4rem;
  padding: 0.7rem 1.2rem;
  min-width: 180px;
  min-height: 36px;
  box-shadow: 0 2px 8px rgba(255, 221, 51, 0.04);
  margin-bottom: 0.5rem;
}

.apb-register .output-label {
  color: var(--output-label);
  font-weight: 600;
  font-size: 0.95em;
  margin-bottom: 0.1rem;
}

.apb-register .output-value {
  color: var(--output-value);
  font-size: 1em;
  word-break: break-all;
}

#dphy-output-table td,
#dphy-output-table th {
  width: 150px;
}

#dphy-rx-output-table td,
#dphy-rx-output-table th {
  width: 150px;
}

/*For image magnification modal*/
/* Modal background */
.img-modal {
  display: none;
  position: fixed;
  z-index: 1001;
  left: 0;
  top: 0;
  width: 110vw;
  height: 200vh;
  overflow: auto;
  background: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
}

.img-modal-content {
  margin-top: 3rem;
  display: block;
  max-width: 90vw;
  max-height: 90vh;
  box-shadow: 0 0 24px #000;
  border-radius: 8px;
}

/* Close button for the modal */
.img-modal-close {
  position: absolute;
  top: 20px;
  right: 40px;
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  z-index: 1010;
  transition: color 0.2s;
}

/* Close button hover effect */
.img-modal-close:hover {
  color: #ffdd33;
}

.img-magnify {
  cursor: zoom-in;
}

/* Top description row as flexbox */
.dphy-description-row {
  display: flex;
  flex-direction: row;
  gap: 2rem;
  width: 100%;
  justify-content: center;
  align-items: stretch;
  margin-bottom: 1.2rem;
  margin-top: 2.5rem;
}
.dphy-description-row .description-box {
  flex: 1 1 0;
  min-width: 260px;
  max-width: 480px;
  margin-bottom: 0;
  margin-left: 0;
  font-weight: bold;
  font-size: 1.1em;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
}

/* Main content row as flexbox */
.main-content-padded {
  display: flex;
  flex-direction: column;
  align-items: center !important;
  justify-content: center !important;
  width: 100%;
  box-sizing: border-box;
  padding-left: 0 !important;
  margin: 0 auto !important;
}

.main-content-padded > div {
  flex: 1 1 0;
  min-width: 320px;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  align-items: center !important;
  justify-content: center !important;
  margin: 0 auto !important;
}

/* Input container as flexbox */
.container.center-fields {
  display: flex;
  flex-direction: column;
  align-items: center !important;
  justify-content: center !important;
  max-width: 420px;
  width: 100%;
  margin: 0 auto !important;
}

/* Output tables as flexbox */
.description-box[style*="max-width: 900px"] {
  display: flex;
  flex-direction: column;
  align-items: center !important;
  justify-content: center !important;
  width: 100%;
  max-width: 900px;
  margin: 0 auto !important;
  margin-top: 2rem;
}

.table-border {
  margin-left: auto !important;
  margin-right: auto !important;
}

/* DPYH Register Configuration page styles */
.dphy-bg-container {
  border-radius: 18px;
  padding: 2rem 0;
  min-height: calc(100vh - 8rem);
  max-height: fit-content;
  margin: auto;
  width: 100%;
  max-width: 1200px;
}

@media (max-width: 900px) {
  .dphy-bg-container {
    padding: 1.2rem 0.5rem;
    max-width: 99vw;
    min-height: 90vh;
  }
}

/* Video Timing Calculator page styles */
.video-timing-bg-container {
  border-radius: 18px;
  padding: 2rem 0;
  min-height: calc(100vh - 8rem);
  max-height: fit-content;
  margin: auto;
  width: 100%;
  max-width: 1200px;
}

@media (max-width: 900px) {
  .video-timing-bg-container {
    padding: 1.2rem 0.5rem;
    max-width: 99vw;
    min-height: 90vh;
  }
}

/* Video Timing description row as flexbox */
.video-timing-description-row {
  display: flex;
  flex-direction: row;
  gap: 2rem;
  width: 100%;
  justify-content: center;
  align-items: stretch;
  margin-bottom: 1.2rem;
  margin-top: 2.5rem;
}

.video-timing-description-row .description-box {
  flex: 1 1 0;
  min-width: 260px;
  max-width: 480px;
  margin-bottom: 0;
  margin-left: 0;
  font-weight: bold;
  font-size: 1.1em;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
}

/* New styles for config.html description and instructions layout */
.index-bg-container {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  width: 80vw;
  min-width: 340px;
  max-width: 1400px;
  margin: 0 auto;
  box-sizing: border-box;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1), min-height 0.3s,
    height 0.3s;
  overflow: visible;
  border-radius: 18px;
  height: fit-content;
}

.index-bg-container.expanded {
  width: 100rem;
  max-width: 120rem;
}

.index-desc-flex-row {
  display: flex;
  flex-direction: row;
  gap: 2.5rem;
  justify-content: flex-start;
  align-items: flex-start;
  margin: 2.5rem 3rem 0 3rem;
}

.index-desc-col {
  flex: 1 1 0;
  min-width: 320px;
  max-width: 520px;
  color: white;
}

/* Dropdown alignment fixes */
#dropdowns-container > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;

  min-width: 270px;
  width: 270px;
}

#mode-row,
#device-row,
#package-row,
#speed-row {
  display: flex;
  align-items: center;
  gap: 0.5rem; /* Reduced gap for tighter spacing */
  width: 270px;
  min-height: 1.5rem; /* Reduced min-height for less vertical space */
  margin-bottom: 0.2rem; /* Add a small margin if needed, or set to 0 for no extra space */
  padding-bottom: 0; /* Ensure no extra padding */
}

#mode-select,
#device-select,
#package-select,
#speed-select {
  min-width: 320px;
  max-width: 320px;
}

#mode-row:last-child,
#device-row:last-child,
#package-row:last-child,
#speed-row:last-child {
  margin-bottom: 0;
}

/* Video Timing Calculator specific styles */
.video-timing-bg-container {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  margin: 0 auto;
  max-width: 1400px;
  /* Remove transition - container stays at fixed width */
}

@media (max-width: 900px) {
  .video-timing-bg-container {
    margin: 0.5rem;
    padding: 1rem;
  }
}

.video-timing-description-row {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.video-timing-description-row .description-box {
  flex: 1;
  min-width: 300px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 1.5rem;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* Video Timing Calculator side-by-side layout */
.video-timing-bg-container .container.center-fields {
  /* Container set to accommodate inputs in center and outputs to the right */
  width: 100%;
  max-width: 1400px;
  display: flex;
  justify-content: center;
  padding: 0 2rem;
}

.video-timing-bg-container .container.center-fields .form-group {
  width: 12.5rem;
}

/* Output section slides in without affecting input position */
.video-timing-bg-container .container.center-fields .outputs-section {
  flex: 0 0 auto;
  min-width: 270px;
  max-width: 300px;
}

/* Video timing output label styling - make them black */
.video-timing-bg-container .output-label {
  color: #000000 !important;
  font-weight: 600;
  font-size: 0.92em;
  margin-bottom: 0.1rem;
  letter-spacing: 0.03em;
}

/* Video timing output value styling*/
.video-timing-bg-container .output-value {
  color: #000000 !important;
  font-size: 0.92em;
  word-break: break-all;
}

/* Responsive adjustments for side-by-side layout */
@media (max-width: 1200px) {
  .video-timing-bg-container .container.center-fields > div {
    flex-direction: column !important;
    gap: 1rem !important;
    width: 100% !important;
    max-width: 700px !important;
    margin: 0 auto !important;
  }

  .video-timing-bg-container .container.center-fields .form-block {
    width: 100% !important;
    max-width: 100% !important;
    margin-left: 0 !important;
    flex: 1 1 auto !important;
  }

  .video-timing-bg-container .container.center-fields .outputs-section {
    min-width: 100% !important;
    max-width: none !important;
    margin-left: 0 !important;
    height: fit-content !important;
    padding: 1rem !important;
    flex: 0 0 auto !important;
    align-self: flex-start !important;
  }
}

/* MachXO3D-style striped tables */
#dphy-output-table,
#dphy-rx-output-table {
  background: #fff;
  border: 1px solid #ccc;
  border-collapse: collapse;
}
#dphy-output-table thead tr,
#dphy-rx-output-table thead tr {
  background: #e6e6e6;
  font-weight: 600;
}
#dphy-output-table td,
#dphy-output-table th,
#dphy-rx-output-table td,
#dphy-rx-output-table th {
  color: #111;
  border: 1px solid #c5c5c5;
  padding: 0.5rem;
}
#dphy-output-table tbody tr:nth-child(odd),
#dphy-rx-output-table tbody tr:nth-child(odd) {
  background: #ffffff;
}
#dphy-output-table tbody tr:nth-child(even),
#dphy-rx-output-table tbody tr:nth-child(even) {
  background: #f2f2f2;
}

/* Unified white container styling */
.container.center-fields,
.description-box,
.index-bg-container .container.center-fields,
.video-timing-bg-container,
.dphy-bg-container .container.center-fields,
.bandwidth-card {
  background: var(--color-surface) !important;
  backdrop-filter: none !important;
  box-shadow: none !important;
  border: var(--container-border) !important;
  color: var(--color-text-secondary) !important;
}

/* Outputs section (highlight) */
.outputs-section {
  background: var(--color-surface-accent) !important;
  border: 1px solid var(--color-border-output) !important;
  color: var(--color-text-secondary) !important;
}

/* Table stripes driven by variables */
#dphy-output-table,
#dphy-rx-output-table {
  background: #fff;
  border: 1px solid #ccc;
  border-collapse: collapse;
}
#dphy-output-table thead tr,
#dphy-rx-output-table thead tr {
  background: var(--color-table-header);
}
#dphy-output-table tbody tr:nth-child(even),
#dphy-rx-output-table tbody tr:nth-child(even) {
  background: var(--color-table-stripe);
}

/* Output text color (final override) */
.output-group span,
#bandwidth-output {
  color: var(--color-text-primary) !important;
}

/* D-PHY extra outputs text color */
#dphy-extra-outputs,
#dphy-extra-outputs strong,
#dphy-extra-outputs span {
  color: var(--color-text-secondary) !important;
}

/* === Drop shadow removal (containers & UI) === */
.container,
.description-box,
.outputs-section,
.bandwidth-card,
.video-timing-container,
.video-timing-bg-container,
.dphy-bg-container,
.index-bg-container,
.diagram-tooltip-content,
.tooltip-content,
.tooltip-text,
.img-modal-content {
  box-shadow: none !important;
}
/* End drop shadow removal overrides */

/* Video Timing page button standardization */
.video-timing-bg-container .button-row {
  justify-content: center !important;
  gap: 1rem;
  margin-top: 1.2rem;
}

.video-timing-bg-container .action-btn {
  min-width: 140px;
  height: 40px; /* ~2.5rem */
  padding: 0 16px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 6px;
  margin-right: 0; /* use flex gap for spacing */
}

/* Ensure hover effect remains consistent */
.video-timing-bg-container .action-btn:hover {
  transform: translateY(-2px) scale(1.05);
}

/* Centering and styling for index.html welcome and disclaimer sections */
.welcome-section,
.disclaimer-section {
  text-align: left;
  font-family: var(--font-family-base);
  font-size: 1.2em;
  margin: 20px auto;
  max-width: 800px;
  text-justify: distribute;
}

.welcome-section h1,
.disclaimer-section h2 {
  text-align: center !important;
  font-size: 1.5em;
  font-weight: bold;
}

.welcome-section p,
.disclaimer-section p {
  font-size: 1em;
  line-height: 1.5;
}

/* Footer disclaimer styling */
.site-footer {
  background: #232426;
  color: #ffffff;
  font-size: 0.85rem;
  line-height: 1.4;
  margin-top: 3rem;
  padding: 2rem 1.5rem;
}
.site-footer h2,
.site-footer h3 {
  color: #ffd600;
  font-size: 1rem;
  margin-top: 0;
}
.site-footer p {
  margin: 0 0 0.8rem 0;
}
.site-footer .disclaimer-text {
  max-width: none;
  width: 100%;
  margin: 0;
  text-align: left;
  white-space: normal;
}
.site-footer a {
  color: #ffd84d;
  text-decoration: underline;
}
.site-footer a:hover {
  color: #ffe899;
}
.site-footer .disclaimer-text.collapsed p:not(:first-of-type) {
  display: none;
}
.site-footer .disclaimer-toggle-wrapper {
  text-align: center;
  margin: 0.8rem 0 1.2rem;
}
#disclaimer-toggle {
  background: #666;
  color: #fff;
  border: 1px solid #888;
  padding: 0.5rem 1.1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}
#disclaimer-toggle:hover {
  background: #777;
}

.disabled-select {
  opacity: 0.45;
  pointer-events: none;
  background: #ccc !important;
  color: #666 !important;
}