:root {
  --primary: #2c3e50;
  --accent: #e67e22;
  --accent-hover: #d35400;
  --bg: #f5f5f0;
  --card-bg: #ffffff;
  --text: #333333;
  --text-light: #666666;
  --border: #ddd;
  --success: #27ae60;
  --danger: #c0392b;
  --waste-low: #27ae60;
  --waste-med: #f39c12;
  --waste-high: #c0392b;
  --input-bg: #ffffff;
  --btn-secondary-bg: #ecf0f1;
  --btn-secondary-hover: #dfe6e9;
  --btn-remove-hover: #fdecea;
  --badge-ready-bg: #e8f5e9;
  --badge-soon-bg: #fff3e0;
  --toggle-off: #ccc;
  --bar-empty: #e0e0e0;
  --bar-waste-bg: #bbb;
  --bar-waste-text: #777;
  --waste-low-bg: #e8f5e9;
  --waste-med-bg: #fff8e1;
  --waste-high-bg: #fdecea;
  --splice-bg: #fff8e1;
  --header-bg: #2c3e50;
  --shadow: rgba(0,0,0,0.08);
  --shadow-strong: rgba(0,0,0,0.15);
}

[data-theme="dark"] {
  --primary: #d1d5db;
  --accent: #e8943a;
  --accent-hover: #d4802a;
  --bg: #181b20;
  --card-bg: #1f2328;
  --text: #e1e4e8;
  --text-light: #8b949e;
  --border: #313840;
  --success: #3fb950;
  --danger: #f85149;
  --waste-low: #3fb950;
  --waste-med: #d29922;
  --waste-high: #f85149;
  --input-bg: #272c33;
  --btn-secondary-bg: #272c33;
  --btn-secondary-hover: #313840;
  --btn-remove-hover: #3d1f1f;
  --badge-ready-bg: #1a2e1f;
  --badge-soon-bg: #2e2714;
  --toggle-off: #484f58;
  --bar-empty: #313840;
  --bar-waste-bg: #484f58;
  --bar-waste-text: #8b949e;
  --waste-low-bg: #1a2e1f;
  --waste-med-bg: #2e2714;
  --waste-high-bg: #3d1f1f;
  --splice-bg: #2e2714;
  --header-bg: #14171b;
  --shadow: rgba(0,0,0,0.4);
  --shadow-strong: rgba(0,0,0,0.5);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---- Header ---- */
header {
  background: var(--header-bg);
  color: white;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 8px var(--shadow-strong);
}
header h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: 0.5px; }
header h1 a { color: inherit; text-decoration: none; }
header h1 span { color: var(--accent); }
header .tagline { font-size: 0.85rem; opacity: 0.8; }

.header-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav-link {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-link:hover { color: white; }

.theme-toggle {
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  color: white;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
}

/* ---- Main Layout ---- */
main { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem; }

/* ---- Tool Portfolio Grid ---- */
.portfolio-heading {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-light);
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.4rem;
  display: inline-block;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.tool-card {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 6px var(--shadow);
  border-left: 4px solid var(--accent);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}
.tool-card h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.tool-card p { font-size: 0.85rem; color: var(--text-light); }
.tool-card .badge {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-top: 0.6rem;
  font-weight: 600;
}
.badge-ready { background: var(--badge-ready-bg); color: var(--success); }
.badge-soon { background: var(--badge-soon-bg); color: var(--accent); }

/* ---- Tool Panel ---- */
.tool-panel {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 2px 10px var(--shadow);
}
.tool-panel h2 {
  font-size: 1.3rem;
  margin-bottom: 0.25rem;
}
.tool-panel .subtitle {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* ---- Form Elements ---- */
label {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
  color: var(--text);
}
.hint {
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--text-light);
}
input[type="number"], input[type="text"], select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text);
  transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(230,126,34,0.15);
}

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.form-group { flex: 1; min-width: 140px; }

/* ---- Buttons ---- */
.btn {
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: 5px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  font-family: inherit;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--btn-secondary-bg); color: var(--text); }
.btn-secondary:hover { background: var(--btn-secondary-hover); }

.btn-remove {
  background: none;
  border: 1px solid var(--danger);
  color: var(--danger);
  width: 32px;
  height: 32px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: background 0.15s;
}
.btn-remove:hover { background: var(--btn-remove-hover); }

.btn-sm {
  padding: 0.3rem 0.7rem;
  font-size: 0.78rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.15s;
}
.btn-sm-primary { background: var(--accent); color: white; }
.btn-sm-primary:hover { background: var(--accent-hover); }
.btn-sm-danger { background: none; border: 1px solid var(--danger); color: var(--danger); }
.btn-sm-danger:hover { background: var(--btn-remove-hover); }

/* ---- Row list entries ---- */
.row-entry {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.row-entry input { flex: 1; }
.row-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

/* ---- Options / Toggles ---- */
.option-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.option-row label { margin-bottom: 0; }
.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--toggle-off);
  border-radius: 24px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle-slider::before {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
}
.toggle-switch input:checked + .toggle-slider { background: var(--accent); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

.option-label-text { font-weight: 600; font-size: 0.85rem; }
.option-hint { font-size: 0.78rem; color: var(--text-light); }

.excess-input {
  width: 80px;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.85rem;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text);
}

.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.unit-toggle button {
  padding: 0.4rem 1rem;
  border: none;
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: background 0.15s;
}
.unit-toggle button.active {
  background: var(--primary);
  color: white;
}
[data-theme="dark"] .unit-toggle button.active {
  background: var(--accent);
}

/* ---- Paste Area ---- */
.paste-section { margin-bottom: 1rem; }
.paste-toggle {
  font-size: 0.85rem;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
  border: none;
  background: none;
  padding: 0;
  font-family: inherit;
}
.paste-toggle:hover { text-decoration: underline; }
.paste-area { display: none; margin-top: 0.5rem; }
.paste-area.visible { display: block; }
.paste-area textarea {
  width: 100%;
  height: 100px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.9rem;
  font-family: inherit;
  resize: vertical;
  line-height: 1.5;
  background: var(--input-bg);
  color: var(--text);
}
.paste-area .paste-help {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 0.3rem;
}
.paste-actions { display: flex; gap: 0.5rem; margin-top: 0.5rem; }

/* ---- Notices ---- */
.splice-notice {
  background: var(--splice-bg);
  border-left: 4px solid var(--waste-med);
  border-radius: 5px;
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.5;
}
.splice-notice strong { color: var(--waste-med); }
.splice-notice ul { margin: 0.4rem 0 0 1.25rem; padding: 0; }
.splice-notice li { margin-bottom: 0.2rem; }
.splice-notice li strong { color: var(--text); }

/* ---- Results ---- */
.results { margin-top: 2rem; }
.results h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.summary-cards {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.summary-card {
  flex: 1;
  min-width: 140px;
  background: var(--bg);
  border-radius: 6px;
  padding: 1rem;
  text-align: center;
}
.summary-card .big {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}
.summary-card .label {
  font-size: 0.78rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---- Cut Plan ---- */
.piece-card {
  background: var(--bg);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}
.piece-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}
.piece-bar-wrapper {
  background: var(--bar-empty);
  border-radius: 4px;
  height: 28px;
  display: flex;
  overflow: hidden;
  margin-bottom: 0.4rem;
}
.piece-bar-segment {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  color: white;
  white-space: nowrap;
  overflow: hidden;
  min-width: 2px;
}
.piece-bar-waste {
  background: var(--bar-waste-bg);
  color: var(--bar-waste-text);
}
.piece-cuts {
  font-size: 0.82rem;
  color: var(--text-light);
}

.waste-indicator {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-size: 0.75rem;
  font-weight: 600;
}
.waste-low { background: var(--waste-low-bg); color: var(--waste-low); }
.waste-med { background: var(--waste-med-bg); color: var(--waste-med); }
.waste-high { background: var(--waste-high-bg); color: var(--waste-high); }

/* ---- Projects ---- */
.project-bar {
  background: var(--card-bg);
  border-radius: 8px;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 6px var(--shadow);
  border-left: 4px solid var(--primary);
  overflow: hidden;
}
.project-collapsed {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  transition: background 0.15s;
}
.project-collapsed:hover { background: var(--bg); }
.project-collapsed .project-active-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary);
}
.project-collapsed .project-active-name span {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-left: 0.5rem;
}
.project-collapsed .project-auto-saved {
  font-size: 0.75rem;
  color: var(--success);
  opacity: 0;
  transition: opacity 0.3s;
}
.project-collapsed .project-auto-saved.flash { opacity: 1; }
.project-collapsed .project-expand-btn {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background 0.15s;
}
.project-collapsed .project-expand-btn:hover { background: rgba(230,126,34,0.1); }
.project-expanded {
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
}
.project-bar:not(.has-project) .project-expanded {
  border-top: none;
  padding-top: 1.25rem;
}
.project-expanded h3 {
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
  color: var(--primary);
}
.project-save-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.project-save-row input[type="text"] {
  flex: 1;
  min-width: 160px;
  max-width: 300px;
}
.saved-projects-list { display: flex; flex-direction: column; gap: 0.4rem; margin-top: 0.5rem; }
.saved-project-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg);
  border-radius: 5px;
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
}
.saved-project-item .project-info { display: flex; flex-direction: column; gap: 0.1rem; flex: 1; min-width: 0; }
.saved-project-item .project-name { font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.saved-project-item .project-meta { font-size: 0.75rem; color: var(--text-light); }
.saved-project-item .project-actions { display: flex; gap: 0.35rem; flex-shrink: 0; margin-left: 0.5rem; }
.no-projects { font-size: 0.82rem; color: var(--text-light); font-style: italic; }

/* ---- Back Link ---- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: 1.25rem;
}
.back-link:hover { text-decoration: underline; }

/* ---- Tables ---- */
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-bottom: 1rem;
}
.results-table th, .results-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.results-table th {
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-light);
}
.results-table tr:last-child td { border-bottom: none; }

/* ---- Sheet SVG ---- */
.sheet-diagram {
  background: var(--bar-empty);
  border-radius: 6px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.sheet-diagram svg { display: block; width: 100%; height: auto; }

/* ---- Run Joint Toggle ---- */
.run-joint { display: none; align-items: center; gap: 0.3rem; font-size: 0.82rem; white-space: nowrap; }
.joint-visible .run-joint { display: flex; }
.run-joint input[type="checkbox"] { margin: 0; }

/* ---- Tool Info Tooltips (index cards) ---- */
.tool-card { position: relative; z-index: 1; }
.tool-card:has(.info-tip-wrap:hover) { z-index: 100; }
.info-tip-wrap {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  z-index: 10;
}
.info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  font-style: italic;
  font-family: Georgia, serif;
  cursor: default;
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}
.info-tip-wrap:hover .info-btn {
  background: var(--accent);
  color: white;
}
.info-tip {
  display: none;
  position: absolute;
  top: calc(100% + 0.4rem);
  right: -0.5rem;
  width: 280px;
  padding: 0.85rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 4px 16px var(--shadow-strong);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text);
  font-weight: 400;
  font-style: normal;
  z-index: 100;
  pointer-events: none;
}
.info-tip::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 1rem;
  width: 10px;
  height: 10px;
  background: var(--card-bg);
  border-left: 1px solid var(--border);
  border-top: 1px solid var(--border);
  transform: rotate(45deg);
}
.info-tip-wrap:hover .info-tip { display: block; }

/* ---- Tool Info Panel (tool pages) ---- */
.tool-info {
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.tool-info summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--bg);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
  user-select: none;
  transition: background 0.15s;
}
.tool-info summary:hover { background: var(--btn-secondary-hover); }
.tool-info summary::-webkit-details-marker { display: none; }
.tool-info summary::before {
  content: "i";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  font-size: 0.72rem;
  font-style: italic;
  font-family: Georgia, serif;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
}
.tool-info[open] summary::before {
  background: var(--accent);
  color: white;
}
.tool-info[open] summary {
  border-bottom: 1px solid var(--border);
}
.tool-info-content {
  padding: 1rem 1.25rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
}
.tool-info-content h4 {
  font-size: 0.9rem;
  margin: 1rem 0 0.35rem;
  color: var(--primary);
}
.tool-info-content h4:first-child { margin-top: 0; }
.tool-info-content p { margin: 0 0 0.6rem; color: var(--text-light); }
.tool-info-content ul { margin: 0 0 0.6rem 1.25rem; padding: 0; color: var(--text-light); }
.tool-info-content li { margin-bottom: 0.25rem; }

/* ---- Confirm Modal ---- */
.confirm-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.confirm-overlay.visible { display: flex; }
.confirm-dialog {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 2rem;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  text-align: center;
  animation: confirmSlide 0.15s ease-out;
}
@keyframes confirmSlide {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.confirm-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  line-height: 1;
}
.confirm-dialog h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.confirm-dialog p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}
.confirm-terms {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 1.25rem;
}
.confirm-terms a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.confirm-terms a:hover { text-decoration: underline; }
.confirm-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}
.confirm-actions .btn {
  min-width: 120px;
  padding: 0.65rem 1.25rem;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  header { padding: 1rem; gap: 0.5rem; }
  main { padding: 1rem; }
  .tool-panel { padding: 1.25rem; }
  .form-row { flex-direction: column; }
  .summary-cards { flex-direction: column; }
  .info-tip-wrap { display: none; }
  .tool-info-content { padding: 0.85rem 1rem; }
}