/* Terminal aesthetic for FPGA calculators */

:root {
  --bg: #0a0a0a;
  --bg-light: #1a1a1a;
  --bg-lighter: #2a2a2a;
  --text: #b0b0b0;
  --text-bright: #e0e0e0;
  --accent: #00ff88;
  --accent-dim: #00aa55;
  --warning: #ffaa00;
  --error: #ff4444;
  --border: #333;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  padding: 1rem;
}

/* Header */
header {
  text-align: center;
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

header h1 {
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.1em;
}

header h1::before {
  content: '> ';
  color: var(--text);
}

.tagline {
  color: var(--text);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* Tab navigation */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.tab {
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.tab:hover {
  background: var(--bg-lighter);
  color: var(--text-bright);
}

.tab.active {
  background: var(--accent-dim);
  color: var(--bg);
  border-color: var(--accent);
}

/* Calculator sections */
.calculator {
  display: none;
  animation: fadeIn 0.2s ease;
}

.calculator.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.calculator h2 {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.calculator h2::before {
  content: '# ';
  color: var(--text);
}

.description {
  color: var(--text);
  font-size: 0.85rem;
  margin-bottom: 0;
  opacity: 0.8;
}

/* Calculator header with reset button */
.calc-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.calc-header > div {
  flex: 1;
}

.reset-btn {
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.75rem;
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reset-btn:hover {
  background: var(--bg-lighter);
  border-color: var(--accent-dim);
  color: var(--text-bright);
}

.reset-btn:active {
  background: var(--accent-dim);
  color: var(--bg);
}

/* Preset selector */
.preset-selector {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding: 0.75rem;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-dim);
}

.preset-selector label {
  color: var(--text);
  font-size: 0.85rem;
  white-space: nowrap;
}

.preset-selector select {
  flex: 1;
  max-width: 300px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-bright);
  padding: 0.4rem 0.6rem;
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.preset-selector select:focus {
  outline: none;
  border-color: var(--accent);
}

.preset-selector select option {
  background: var(--bg);
  color: var(--text-bright);
}

.preset-selector select optgroup {
  color: var(--accent);
  font-style: normal;
}

/* Input groups */
.inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.input-group label {
  color: var(--text);
  font-size: 0.8rem;
}

.input-group input[type="number"],
.input-group input[type="text"] {
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--text-bright);
  padding: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  width: 100%;
}

.input-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.input-group input[type="checkbox"] {
  width: auto;
  margin-right: 0.5rem;
  accent-color: var(--accent);
}

.input-group label:has(input[type="checkbox"]) {
  flex-direction: row;
  align-items: center;
  cursor: pointer;
}

/* Results */
.results {
  background: var(--bg-light);
  border: 1px solid var(--border);
  padding: 1rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.results h3 {
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 400;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.copy-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.3rem 0.6rem;
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: all 0.2s;
}

.copy-btn:hover {
  background: var(--bg-lighter);
  border-color: var(--accent);
  color: var(--text-bright);
}

.copy-btn.copied {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--bg);
}

.copy-btn svg {
  width: 14px;
  height: 14px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px dashed var(--border);
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  color: var(--text);
}

.result-value {
  color: var(--accent);
  font-weight: 600;
}

.result-value.warning {
  color: var(--warning);
}

.result-value.error {
  color: var(--error);
}

.result-warning {
  margin-top: 0.75rem;
  padding: 0.5rem;
  background: rgba(255, 170, 0, 0.1);
  border-left: 3px solid var(--warning);
  color: var(--warning);
  font-size: 0.85rem;
}

/* Formula display */
.formula {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-dim);
  padding: 1rem;
  margin-top: 1.5rem;
}

.formula h3 {
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.formula code {
  display: block;
  color: var(--text-bright);
  font-size: 0.9rem;
  padding: 0.25rem 0;
}

/* PLL results table */
.pll-results {
  max-height: 300px;
  overflow-y: auto;
}

.pll-results table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.pll-results th,
.pll-results td {
  padding: 0.5rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
}

.pll-results th {
  color: var(--text);
  font-weight: 400;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.pll-results td {
  color: var(--text-bright);
}

.pll-results tr:hover td {
  background: var(--bg-lighter);
}

.pll-results .exact {
  color: var(--accent);
}

.pll-results .placeholder {
  color: var(--text);
  opacity: 0.6;
  font-style: italic;
}

.pll-results .no-results {
  color: var(--warning);
}

.pll-results .pfd-warning td {
  opacity: 0.6;
}

.pll-results .pfd-note {
  color: var(--warning);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

/* SerDes results table */
.serdes-results {
  max-height: 300px;
  overflow-y: auto;
}

.serdes-results table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.serdes-results th,
.serdes-results td {
  padding: 0.5rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
}

.serdes-results th {
  color: var(--text);
  font-weight: 400;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.serdes-results td {
  color: var(--text-bright);
}

.serdes-results tr:hover td {
  background: var(--bg-lighter);
}

.serdes-results .exact td {
  color: var(--accent);
}

/* Recommendation badges */
.rec-badge {
  display: inline-block;
  font-size: 0.65rem;
  padding: 0.15rem 0.35rem;
  margin-left: 0.4rem;
  border-radius: 3px;
  font-weight: 600;
  vertical-align: middle;
  cursor: help;
}

.rec-badge.single {
  background: var(--accent);
  color: var(--bg);
}

.rec-badge.multi {
  background: var(--warning);
  color: var(--bg);
}

.rec-legend {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text);
}

.rec-legend .rec-badge {
  margin-left: 0;
  margin-right: 0.3rem;
}

.serdes-results .placeholder {
  color: var(--text);
  opacity: 0.6;
  font-style: italic;
}

.serdes-results .no-results {
  color: var(--warning);
  line-height: 1.6;
}

.serdes-results .no-results strong {
  color: var(--error);
}

.serdes-results .refclk-note {
  color: var(--warning);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

.serdes-results .error-bullet {
  display: block;
  margin-left: 0.5rem;
  color: var(--text);
}

/* Tooltip note styling */
.tooltip-note {
  font-size: 0.85em;
  opacity: 0.8;
  margin-top: 0.5rem;
  font-style: italic;
}

/* Visually hidden for screen readers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 0 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--accent-dim);
  text-decoration: none;
}

footer a:hover {
  color: var(--accent);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text);
}

/* Help tooltips */
.input-group label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: var(--bg-lighter);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  font-size: 10px;
  font-weight: bold;
  cursor: help;
  flex-shrink: 0;
  transition: all 0.2s;
}

.help-icon:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--bg);
}

.help-wrapper {
  position: relative;
  display: inline-flex;
}

.help-tooltip {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  max-width: 90vw;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--bg-light);
  border: 1px solid var(--accent-dim);
  padding: 1rem;
  padding-top: 1.5rem;
  font-size: 0.85rem;
  line-height: 1.5;
  z-index: 1000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.7);
}

.tooltip-close {
  position: absolute;
  top: 0.25rem;
  right: 0.25rem;
  width: 24px;
  height: 24px;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
}

.tooltip-close:hover {
  color: var(--accent);
}

.help-wrapper:hover .help-tooltip:not(.closed),
.help-tooltip.active:not(.closed) {
  display: block;
}

.help-tooltip h4 {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.help-tooltip p {
  color: var(--text);
  margin-bottom: 0.5rem;
}

.help-tooltip p:last-child {
  margin-bottom: 0;
}

.help-tooltip strong {
  color: var(--text-bright);
}

.help-tooltip .tip-list {
  margin: 0.4rem 0;
  padding-left: 0.2rem;
  line-height: 1.7;
}

.help-tooltip code {
  background: var(--bg);
  padding: 0.1rem 0.3rem;
  font-size: 0.75rem;
}

/* Memory Bandwidth Calculator Results */
.mem-summary {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--bg-lighter);
  border-radius: 4px;
}

.mem-peak,
.mem-effective {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
}

.mem-summary .label {
  font-weight: 500;
  color: var(--text);
  min-width: 140px;
}

.mem-summary .value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-bright);
}

.mem-effective .efficiency {
  font-size: 0.9rem;
  color: var(--accent);
}

/* Secondary outputs (data per burst, transactions, etc.) */
.mem-secondary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--bg-lighter);
  border-radius: 4px;
  font-size: 0.9rem;
}

.secondary-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.secondary-item .label {
  font-size: 0.8rem;
  color: var(--text);
  opacity: 0.7;
}

.secondary-item .value {
  font-weight: 500;
  color: var(--text-bright);
}

/* Breakdown table */
.mem-results h4 {
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 1.5rem 0 0.75rem;
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.breakdown-table th,
.breakdown-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.breakdown-table th {
  font-weight: 400;
  color: var(--text);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.breakdown-table td {
  color: var(--text-bright);
}

.breakdown-table .loss {
  color: var(--error);
}

.breakdown-table .gain {
  color: var(--accent);
}

.breakdown-table .note {
  font-size: 0.8rem;
  color: var(--text);
  opacity: 0.7;
}

.breakdown-table tr.subtotal td {
  border-top: 2px solid var(--border);
  font-weight: 500;
}

.breakdown-table tr.final-row td {
  border-top: 2px solid var(--border);
  font-weight: 600;
  background: var(--bg-lighter);
}

.breakdown-table .final {
  color: var(--accent);
  font-weight: 600;
}

/* Advanced timing collapsible */
.advanced-timing {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.advanced-timing summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--text);
}

.advanced-timing summary:hover {
  color: var(--text-bright);
}

.advanced-timing[open] summary {
  border-bottom: 1px solid var(--border);
}

.advanced-timing .inputs {
  padding: 1rem;
  margin-bottom: 0;
}

.advanced-note {
  padding: 0 1rem 1rem;
  font-size: 0.85rem;
  color: var(--text);
  opacity: 0.7;
  font-style: italic;
  margin: 0;
}

.advanced-intro {
  padding: 0.75rem 1rem 0;
  font-size: 0.85rem;
  color: var(--text);
  margin: 0;
}

/* Workload preset buttons */
.workload-presets {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-dim);
}

.workload-presets > label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.preset-btn {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-family: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  background: var(--accent-dim);
  color: var(--bg);
  border-color: var(--accent);
}

.preset-btn:active {
  transform: scale(0.98);
}

/* Visual feedback when preset is applied */
.preset-applied {
  animation: preset-flash 0.5s ease;
}

@keyframes preset-flash {
  0% { background-color: var(--accent-dim); }
  100% { background-color: transparent; }
}

/* Input validation states */
.input-error {
  border-color: var(--error) !important;
  box-shadow: 0 0 0 2px rgba(255, 68, 68, 0.2);
}

.validation-errors {
  background: rgba(255, 68, 68, 0.1);
  border: 1px solid var(--error);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.error-message {
  color: var(--error);
  margin: 0;
  font-size: 0.9rem;
}

.validation-warnings {
  background: rgba(255, 170, 0, 0.1);
  border: 1px solid var(--warning);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.warning-message {
  color: var(--warning);
  margin: 0;
  font-size: 0.9rem;
}

/* Guidance/recommendations section */
.guidance-section {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--bg-lighter);
  border-radius: 4px;
  border-left: 3px solid var(--accent-dim);
}

.guidance-section h4 {
  margin: 0 0 0.75rem 0;
  color: var(--text-bright);
  font-size: 0.85rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.guidance-section .rating {
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.guidance-section .rating.good {
  background: rgba(0, 255, 136, 0.15);
  color: var(--accent);
}

.guidance-section .rating.okay {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
}

.guidance-section .rating.warning {
  background: rgba(255, 170, 0, 0.15);
  color: var(--warning);
}

.guidance-section .rating.poor {
  background: rgba(255, 68, 68, 0.15);
  color: var(--error);
}

.guidance-tip {
  margin: 0.5rem 0;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.guidance-tip summary {
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--accent);
}

.guidance-tip summary:hover {
  background: var(--bg-light);
}

.guidance-tip[open] summary {
  border-bottom: 1px solid var(--border);
}

.guidance-tip ul {
  margin: 0;
  padding: 0.75rem 1rem 0.75rem 2rem;
  font-size: 0.9rem;
}

.guidance-tip li {
  margin-bottom: 0.4rem;
  color: var(--text);
}

/* Input group select styling for memory bandwidth */
.input-group select {
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--text-bright);
  padding: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  width: 100%;
  cursor: pointer;
}

.input-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.input-group select option {
  background: var(--bg);
  color: var(--text-bright);
}

/* Mobile adjustments */
@media (max-width: 600px) {
  body {
    font-size: 13px;
    padding: 0.5rem;
  }

  .tabs {
    gap: 0.25rem;
  }

  .tab {
    padding: 0.4rem 0.6rem;
    font-size: 0.75rem;
  }

  .inputs {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 1.2rem;
  }

  /* Preset selector mobile */
  .preset-selector {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .preset-selector select {
    max-width: none;
  }

  /* Memory bandwidth mobile */
  .mem-secondary {
    grid-template-columns: 1fr 1fr;
  }

  .preset-buttons {
    gap: 0.3rem;
  }

  .preset-btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }
}