html:not([data-theme="dark"]) { --bg-page:#f4f7fa; --bg-card:#fff; --bg-input:#f8fafc; --bg-input-focus:#fff; --text-main:#172a3c; --text-muted:#516579; --text-label:#33475b; --border:#cbd5e1; --border-hover:#94a3b8; --primary:#087b59; --primary-hover:#066448; --accent-blue:#0369a1; --accent-purple:#7e22ce; --warning:#925d00; --danger:#b91c1c; --min-color:#1d4ed8; --max-color:#b91c1c; --glass-bg:#fff; --glass-border:#cbd5e1; }
html:not([data-theme="dark"]) body { background-image:none; }
html:not([data-theme="dark"]) .info-box { color:var(--text-main) !important; }
html:not([data-theme="dark"]) .hud-card p { color:var(--text-main); }
.cutting-options { border:1px solid var(--border); border-radius:12px; padding:16px; margin-bottom:18px; }
.cutting-options summary { cursor:pointer; font-weight:700; min-height:32px; }
.cutting-options label { display:block; margin:14px 0 6px; }
.cutting-options p { font-size:.82rem; color:var(--text-muted); line-height:1.6; margin-top:12px; }
#calcError { padding:14px; border:1px solid var(--danger); color:var(--danger); border-radius:10px; margin:12px 0; }
:focus-visible { outline:3px solid var(--accent-blue); outline-offset:3px; }
input,select,button { min-height:44px; }
@media(max-width:600px) { .form-row { flex-wrap:wrap; } .form-row .form-group { min-width:120px; } }

html:not([data-theme="dark"]) .calc-btn { color:white; }
.theme-control { padding:10px 16px; border:1px solid var(--border); background:var(--bg-card); color:var(--text-main); border-radius:10px; cursor:pointer; }

body { padding:0 20px 48px; }
.main-wrapper { max-width:1180px; }
.app-header {
  min-height:72px; margin:0 0 24px; padding:14px 18px; border-radius:0 0 16px 16px;
  display:flex; flex-direction:row; align-items:center; justify-content:space-between; gap:16px;
  box-shadow:0 8px 24px rgba(15,23,42,.08); overflow:visible;
}
.site-brand { display:inline-flex; align-items:center; gap:10px; color:var(--text-main); text-decoration:none; font-size:1rem; }
.site-brand > span { width:38px; height:38px; display:grid; place-items:center; border-radius:11px; background:var(--primary); color:#fff; font-size:.78rem; font-weight:900; }
.header-nav { width:auto; margin:0; display:flex; align-items:center; justify-content:flex-end; gap:10px; }
.back-link,.theme-control { min-height:42px; padding:9px 14px; border-radius:10px; text-transform:none; letter-spacing:0; font-size:.82rem; font-weight:700; }
.back-link { background:var(--bg-input); color:var(--text-main); }
.back-link:hover { color:var(--primary); background:var(--bg-input); transform:none; }
.theme-control { white-space:nowrap; }
.tool-hero { display:grid; grid-template-columns:minmax(0,1fr) minmax(320px,440px); align-items:center; gap:42px; padding:28px 30px; margin-bottom:24px; background:var(--bg-card); border:1px solid var(--border); border-radius:20px; box-shadow:0 12px 32px rgba(15,23,42,.08); }
.hero-copy { max-width:610px; }
.eyebrow { margin:0 0 8px; color:var(--primary); font-size:.72rem; font-weight:800; text-transform:uppercase; letter-spacing:.12em; }
.tool-hero h1 { margin:0; color:var(--text-main); font-size:clamp(2rem,4vw,3.15rem); line-height:1.04; letter-spacing:-.045em; }
.hero-copy > p:not(.eyebrow) { max-width:590px; margin:16px 0 0; color:var(--text-muted); font-size:1rem; line-height:1.65; }
.hero-badges { display:flex; flex-wrap:wrap; gap:8px; margin-top:20px; }
.hero-badges span { padding:7px 11px; border-radius:999px; background:var(--bg-input); border:1px solid var(--border); color:var(--text-label); font-size:.72rem; font-weight:750; }
.tool-hero .app-banner { width:100%; max-width:none; margin:0; }
.tool-hero .app-banner img { width:100%; height:auto; display:block; border-radius:14px; }
.app-container { gap:24px; }
.panel { padding:24px; border-radius:16px; box-shadow:0 8px 24px rgba(15,23,42,.07); transition:border-color .2s ease,box-shadow .2s ease; }
.panel:hover { box-shadow:0 10px 28px rgba(15,23,42,.1); }
.panel-title,.results-header { color:var(--text-main); }
.panel-title { margin-bottom:20px; padding-bottom:13px; font-size:1.05rem; }
.form-group { margin-bottom:17px; }
label { letter-spacing:.055em; }
input,select { border-radius:10px; }
.calc-btn { width:100%; min-height:50px; margin-top:4px; border-radius:11px; letter-spacing:.02em; text-transform:none; font-size:.95rem; }
.results-panel { min-height:0; }
.hud-grid { gap:12px; }
.hud-card { padding:16px 18px; border-radius:12px; box-shadow:none; }
.hud-card.std { transform:none; }
.hud-card:hover,.hud-card.std:hover { transform:none; }
.cutting-options { background:var(--bg-input); }
#gcodePanel,#simPanel { margin-top:24px !important; }
.tech-guides { margin-top:32px; }

/* Quick Preset Chips */
.quick-chips { display:flex; flex-wrap:wrap; align-items:center; gap:6px; margin:8px 0 16px; }
.quick-chip-label { font-size:0.72rem; font-weight:700; color:var(--text-muted); text-transform:uppercase; letter-spacing:0.05em; margin-right:4px; }
.preset-chip {
  padding:4px 10px; border-radius:999px; border:1px solid var(--border);
  background:var(--bg-input); color:var(--text-main); font-size:0.76rem;
  font-weight:700; font-family:var(--font-mono, monospace); cursor:pointer;
  min-height:28px; transition:all 0.15s ease;
}
.preset-chip:hover { border-color:var(--primary); color:var(--primary); background:var(--bg-card); transform:translateY(-1px); }
.preset-chip:active { transform:translateY(0); }

/* Engineering Metrics Grid */
.metrics-grid {
  display:grid; grid-template-columns:repeat(auto-fit, minmax(130px, 1fr));
  gap:10px; margin:16px 0;
}
.metric-card {
  padding:12px 14px; border-radius:12px; background:var(--bg-input);
  border:1px solid var(--border); display:flex; flex-direction:column; gap:4px;
}
.metric-card.highlight {
  border-color:var(--primary); background:rgba(16, 185, 129, 0.08);
}
.metric-label {
  font-size:0.7rem; font-weight:750; text-transform:uppercase;
  letter-spacing:0.05em; color:var(--text-muted);
}
.metric-value {
  font-size:1.15rem; font-weight:800; font-family:var(--font-mono, monospace);
  color:var(--text-main); line-height:1.2;
}
.metric-card.highlight .metric-value { color:var(--primary); }
.metric-unit { font-size:0.75rem; font-weight:600; color:var(--text-muted); margin-left:2px; }
.metric-sub { font-size:0.68rem; color:var(--text-muted); line-height:1.3; }

/* G-Code Actions & Download Button */
.gcode-actions { display:flex; align-items:center; gap:8px; }
.gcode-dl-btn {
  background:var(--bg-input); color:var(--text-main); border:1px solid var(--border);
  padding:6px 12px; border-radius:8px; font-size:0.75rem; font-weight:700;
  cursor:pointer; min-height:32px; display:inline-flex; align-items:center; gap:4px;
  transition:all 0.18s ease;
}
.gcode-dl-btn:hover { border-color:var(--primary); color:var(--primary); }

/* Simulation Speed Pills */
.sim-speed-pills { display:inline-flex; align-items:center; border:1px solid var(--border); border-radius:8px; overflow:hidden; background:var(--bg-input); margin-left:4px; }
.speed-pill {
  padding:4px 9px; border:none; background:transparent; color:var(--text-muted);
  font-size:0.72rem; font-weight:750; cursor:pointer; min-height:30px;
  transition:all 0.15s ease;
}
.speed-pill.active { background:var(--primary); color:#022c22; font-weight:800; }
.speed-pill:not(.active):hover { color:var(--text-main); background:rgba(255,255,255,0.05); }

/* Contrast & Alert Polish */
.info-box {
  padding:14px 18px; border-radius:12px; border:1px solid var(--border);
  border-left:4px solid var(--accent-blue); background:var(--bg-input);
  color:var(--text-main); font-size:0.86rem; line-height:1.55; margin-top:14px;
}
.info-box.warning { border-left-color:var(--warning); }
.info-box.danger { border-left-color:var(--danger); }
.info-box-title { font-weight:800; font-size:0.78rem; text-transform:uppercase; letter-spacing:0.05em; display:flex; align-items:center; gap:6px; margin-bottom:4px; }
.info-box.warning .info-box-title { color:var(--warning); }
.info-box.danger .info-box-title { color:var(--danger); }

html:not([data-theme="dark"]) .info-box { background:#f8fafc; border-color:#cbd5e1; color:#1e293b !important; }
html:not([data-theme="dark"]) .info-box.warning { background:#fffbeb; border-color:#fde68a; }
html:not([data-theme="dark"]) .info-box.danger { background:#fef2f2; border-color:#fecaca; }
html:not([data-theme="dark"]) .metric-card { background:#f8fafc; border-color:#cbd5e1; }
html:not([data-theme="dark"]) .metric-card.highlight { background:#ecfdf5; border-color:#a7f3d0; }
html:not([data-theme="dark"]) .metric-value { color:#0f172a; }
html:not([data-theme="dark"]) .preset-chip { background:#f1f5f9; border-color:#cbd5e1; color:#334155; }
html:not([data-theme="dark"]) .preset-chip:hover { background:#ffffff; border-color:var(--primary); color:var(--primary); }
html:not([data-theme="dark"]) .gcode-dl-btn { background:#f1f5f9; border-color:#cbd5e1; color:#334155; }
html:not([data-theme="dark"]) .sim-speed-pills { background:#f1f5f9; border-color:#cbd5e1; }
html:not([data-theme="dark"]) .speed-pill.active { background:var(--primary); color:#ffffff; }
html:not([data-theme="dark"]) .timeline-title { color: var(--text-main); }
html:not([data-theme="dark"]) .timeline-title .badge { background: #f1f5f9; border-color: #cbd5e1; color: var(--primary); }
html:not([data-theme="dark"]) .timeline-title .badge.blue { color: var(--accent-blue); }
html:not([data-theme="dark"]) .section-title { color: var(--text-main); }
html:not([data-theme="dark"]) .accordion-item { background: #f8fafc; border-color: #cbd5e1; }
html:not([data-theme="dark"]) .accordion-item:hover { background: #ffffff; border-color: var(--border-hover); }
html:not([data-theme="dark"]) .accordion-header { color: var(--text-main); }
html:not([data-theme="dark"]) .accordion-inner h4 { color: var(--text-main); }
html:not([data-theme="dark"]) .accordion-inner code { background: #f1f5f9; border-color: #cbd5e1; color: #065f46; }
html:not([data-theme="dark"]) .guide-promo-box { border-color: rgba(8, 123, 89, 0.35); background: linear-gradient(135deg, rgba(8, 123, 89, 0.08), rgba(3, 105, 161, 0.08)); }
html:not([data-theme="dark"]) .guide-promo-box p { color: var(--text-main); }
html:not([data-theme="dark"]) .promo-btn { color: #ffffff; }
html:not([data-theme="dark"]) .promo-btn.blue-btn { color: #ffffff; }
html:not([data-theme="dark"]) .promo-btn:hover { color: #ffffff; background: var(--primary-hover); }
html:not([data-theme="dark"]) .promo-btn.blue-btn:hover { color: #ffffff; background: #0284c7; }
html:not([data-theme="dark"]) #simPlayBtn { color: #ffffff !important; }
html:not([data-theme="dark"]) .gcode-copy-btn:hover { color: #ffffff; }
html:not([data-theme="dark"]) .empty-state { background: #f8fafc; border-color: #cbd5e1; color: #475569; }
html:not([data-theme="dark"]) .sim-block-monitor { background: #f0f9ff; border-color: #bae6fd; }
.gcode-header-bar .gcode-filename { color: #94a3b8 !important; }

@media (min-width:868px) {
  .app-container { grid-template-columns:minmax(350px,420px) minmax(0,1fr); }
}
@media (max-width:760px) {
  body { padding:0 14px 32px; }
  .app-header { min-height:64px; padding:11px 12px; margin-bottom:14px; }
  .site-brand strong { display:none; }
  .back-link,.theme-control { padding:8px 10px; font-size:.75rem; }
  .tool-hero { grid-template-columns:1fr; gap:20px; padding:22px; }
  .tool-hero .app-banner { order:-1; }
  .tool-hero h1 { font-size:2rem; }
  .hero-copy > p:not(.eyebrow) { font-size:.9rem; }
  .panel { padding:20px; }
  .metrics-grid { grid-template-columns:repeat(2, 1fr); }
}
@media (max-width:420px) {
  .back-link svg { display:none; }
  .site-brand > span { width:34px; height:34px; }
  .tool-hero { padding:16px; border-radius:15px; }
  .form-row { grid-template-columns:1fr; gap:0; }
  .hud-card { align-items:flex-start; gap:10px; }
  .metrics-grid { grid-template-columns:1fr; }
}