/* DCPS Scheduling Simulator — layout & theme */

:root {
  --bg: #f4f6fb;
  --bg-elevated: #ffffff;
  --text: #1a1d26;
  --text-muted: #5c6478;
  --border: #e2e6ef;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --success: #059669;
  --danger: #dc2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
  --font-sans: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --gantt-colors: #3b82f6, #8b5cf6, #10b981, #f59e0b, #ef4444, #06b6d4, #ec4899, #84cc16;
}

[data-theme="dark"] {
  --bg: #0f1219;
  --bg-elevated: #171b24;
  --text: #eef1f7;
  --text-muted: #9aa3b8;
  --border: #2a3142;
  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.15);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 120% 80% at 100% -20%, rgba(37, 99, 235, 0.08), transparent),
    radial-gradient(ellipse 80% 60% at 0% 100%, rgba(139, 92, 246, 0.06), transparent);
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(ellipse 120% 80% at 100% -20%, rgba(96, 165, 250, 0.12), transparent),
    radial-gradient(ellipse 80% 60% at 0% 100%, rgba(139, 92, 246, 0.08), transparent);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
}

.app-header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.15rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  padding: 0 1rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}

.tab {
  flex: 1;
  min-width: 0;
  max-width: none;
  padding: 0.65rem 0.75rem;
  font: inherit;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.tab:hover {
  color: var(--text);
  background: var(--accent-soft);
}

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

.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.panel-intro {
  margin-bottom: 1.25rem;
}

.panel-intro h2 {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
}

.panel-intro p {
  margin: 0;
  color: var(--text-muted);
  max-width: 65ch;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card-wide {
  margin-bottom: 1rem;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 600;
}

.card-icon {
  opacity: 0.85;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field-hint {
  margin: 0.15rem 0 0;
  font-size: 0.8rem;
}

.label-text {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tooltip-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  font-size: 0.65rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  cursor: help;
  vertical-align: middle;
}

.tooltip-wrap::after {
  content: attr(data-tooltip);
  position: absolute;
  z-index: 20;
  left: 0;
  top: 100%;
  margin-top: 6px;
  padding: 0.6rem 0.75rem;
  max-width: 280px;
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
  text-transform: none;
  letter-spacing: normal;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: opacity 0.2s, transform 0.2s;
}

.tooltip-wrap {
  position: relative;
}

.tooltip-wrap:hover::after,
.tooltip-wrap:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

input,
select,
textarea {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.65rem;
}

input:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.process-fields {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.proc-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(5rem, 1fr));
  gap: 0.5rem;
  align-items: end;
  padding: 0.65rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.proc-row label {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.proc-row input {
  width: 100%;
}

.btn-row,
.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.btn {
  font: inherit;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

[data-theme="dark"] .btn-primary {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-ghost:hover,
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.form-error {
  margin: 0;
  font-size: 0.85rem;
  color: var(--danger);
  font-weight: 500;
}

.hint {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.compare-fieldset {
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin: 0 0 0.75rem;
}

.chk {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-right: 0.75rem;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.compare-out {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  font-size: 0.85rem;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.5rem;
  text-align: left;
}

.compare-table th {
  background: var(--bg);
}

/* Gantt */
.gantt-wrap {
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.gantt {
  display: flex;
  align-items: stretch;
  min-height: 52px;
  gap: 2px;
  padding: 0.5rem 0;
}

.gantt-seg {
  position: relative;
  min-width: 8px;
  height: 48px;
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  flex-shrink: 0;
  animation: ganttGrow 0.6s ease forwards;
  transform-origin: left center;
}

@keyframes ganttGrow {
  from {
    transform: scaleX(0.2);
    opacity: 0.5;
  }
  to {
    transform: scaleX(1);
    opacity: 1;
  }
}

.gantt-seg.idle {
  background: var(--text-muted) !important;
  color: #fff;
}

.gantt-seg.current-step {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  z-index: 2;
}

.gantt-axis {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
  white-space: nowrap;
}

/* Table */
.table-scroll {
  overflow-x: auto;
  margin-bottom: 0.75rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: center;
}

.data-table th {
  background: var(--bg);
  font-weight: 600;
}

.data-table tbody tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .data-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.03);
}

.metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-weight: 600;
}

.metrics-stack {
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.metric-row {
  margin: 0;
  font-size: 0.95rem;
}

.metric-label {
  color: var(--text-muted);
  font-weight: 500;
}

.metrics span {
  color: var(--text-muted);
  font-weight: 500;
}

.order-block {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.order-line {
  margin: 0.35rem 0;
  color: var(--text-muted);
  line-height: 1.45;
}

.order-line strong {
  color: var(--text);
}

.disk-visit-line {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
}

.subheading {
  margin: 1rem 0 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.seek-highlight {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 1rem;
  padding: 1rem 1.15rem;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.seek-highlight-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.seek-highlight-value {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
}

.seek-highlight-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  width: 100%;
  margin-top: 0.25rem;
}

.seek-list {
  margin: 0;
  padding-left: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.seek-list li {
  margin-bottom: 0.35rem;
}

.seek-list li.current-step {
  color: var(--accent);
  font-weight: 700;
}

.canvas-wrap {
  overflow-x: auto;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.disk-chart-wrap {
  background: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.disk-chart-hint {
  max-width: 75ch;
  margin-bottom: 0.85rem;
}

.disk-chart-hint strong {
  color: var(--text);
  font-weight: 600;
}

.canvas-caption {
  margin: 0.65rem 0 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

#disk-canvas {
  display: block;
  width: 100%;
  max-width: 920px;
  min-height: 360px;
  height: auto;
}

.app-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Theme toggle icon */
.icon-theme::before {
  content: "🌙";
}

[data-theme="dark"] .icon-theme::before {
  content: "☀";
}

/* Print / PDF */
.print-root {
  position: fixed;
  left: -9999px;
  top: 0;
  width: 210mm;
  padding: 12mm;
  background: #fff;
  color: #111;
}

@media print {
  body * {
    visibility: hidden;
  }
  .print-root,
  .print-root * {
    visibility: visible;
  }
  .print-root {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
  }
  .skip-link,
  .app-header,
  .tabs,
  .app-footer,
  .main {
    display: none !important;
  }
}

.banker-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.banker-table {
  width: 100%;
  max-width: 100%;
}

.banker-table .banker-cell {
  width: 4.5rem;
  max-width: 100%;
  padding: 0.35rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-align: center;
}

.banker-avail-row th {
  white-space: nowrap;
}

.banker-banner {
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  border: 1px solid var(--border);
}

.banker-banner--safe {
  background: rgba(5, 150, 105, 0.12);
  border-color: rgba(5, 150, 105, 0.35);
}

.banker-banner--unsafe {
  background: rgba(220, 38, 38, 0.1);
  border-color: rgba(220, 38, 38, 0.35);
}

[data-theme="dark"] .banker-banner--safe {
  background: rgba(52, 211, 153, 0.12);
  border-color: rgba(52, 211, 153, 0.3);
}

[data-theme="dark"] .banker-banner--unsafe {
  background: rgba(248, 113, 113, 0.1);
  border-color: rgba(248, 113, 113, 0.3);
}

.banker-banner-title {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.banker-banner--safe .banker-banner-title {
  color: var(--success);
}

.banker-banner--unsafe .banker-banner-title {
  color: var(--danger);
}

.banker-banner-desc,
.banker-banner-note {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.banker-banner-note {
  font-weight: 600;
  color: var(--accent);
}

.banker-runtime {
  padding: 0.85rem 1rem;
  margin: 0.75rem 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  min-height: 2.5rem;
}

.banker-runtime-note {
  margin: 0 0 0.65rem;
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 600;
}

.banker-runtime-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
}

.banker-trace li {
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}

.banker-trace li.current-step {
  border-left: 3px solid var(--accent);
  padding-left: 0.65rem;
  margin-left: -0.25rem;
}
/* ================= PAGE REPLACEMENT ================= */

.page-table {
  margin-top: 1rem;
}

.page-replaced {
  background-color: rgba(220, 38, 38, 0.2);
  font-weight: bold;
}

.page-hit-frame {
  background-color: rgba(5, 150, 105, 0.2);
  font-weight: bold;
}

#page-table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
}

#page-table-wrap p {
  color: var(--text-muted);
  font-size: 0.9rem;
}
.page-table th {
  background: var(--accent-soft);
}

@media (max-width: 600px) {
  .tabs {
    flex-direction: column;
  }
  .tab {
    max-width: none;
  }
}