/* ─── RESET & BASE ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0a0a0a;
  --surface:     #111111;
  --surface2:    #181818;
  --border:      #242424;
  --accent:      #28D14C;
  --accent2:     #1a9438;
  --accent-glow: rgba(106, 191, 0, 0.14);
  --text:        #e8eae0;
  --text-muted:  #8a9080;
  --text-dim:    #4a5040;
  --success:     #aaff00;
  --error:       #ff4d6d;
  --warning:     #ffb347;
  --radius:      10px;
  --radius-lg:   16px;
  --shadow:      0 4px 24px rgba(0,0,0,0.6);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── HEADER ─────────────────────────────────────── */
.site-header {
  background: linear-gradient(135deg, #080808 0%, #0e0e0e 60%, #0a0d08 100%);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 2rem;
  position: relative;
  overflow: hidden;
}

.site-header::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(40,209,76,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

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

.logo-mark {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: block;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-main {
  font-family: 'Orbitron', monospace;
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(40,209,76,0.35);
  letter-spacing: 0.04em;
}

.logo-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-top: 1px;
}

.header-tagline {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-style: italic;
}

/* ─── NAV ────────────────────────────────────────── */
.site-nav {
  background: #0d0d0d;
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

.site-nav ul {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  list-style: none;
  gap: 0;
}

.site-nav a {
  display: block;
  padding: 0.75rem 1.25rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ─── PAGE HERO ──────────────────────────────────── */
.page-hero {
  background: linear-gradient(135deg, #0a0a0a 0%, #111811 100%);
  border-bottom: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
}

.page-hero h1 {
  font-family: 'Orbitron', monospace;
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.page-hero p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ─── CONTENT CARD ───────────────────────────────── */
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.content-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: 'Orbitron', monospace;
}

.content-card p {
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ─── SERVICE CARDS ──────────────────────────────── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}

.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.service-tag {
  display: inline-block;
  font-family: 'Orbitron', monospace;
  font-size: 0.65rem;
  font-weight: 700;
  color: #000;
  background: var(--accent);
  border-radius: 4px;
  padding: 3px 8px;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.service-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.service-card ul {
  list-style: none;
  margin-top: 0.75rem;
}

.service-card ul li {
  font-size: 0.83rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.service-card ul li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.cta-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.cta-bar p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

/* ─── MAIN LAYOUT ─────────────────────────────────── */
.main-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ─── PAGE INTRO ─────────────────────────────────── */
.page-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem 2.25rem;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #0e0e0e 0%, #111811 100%);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-lg);
  flex-wrap: wrap;
}

.page-intro-text h1 {
  font-family: 'Orbitron', monospace;
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text);
  letter-spacing: 0.03em;
  margin-bottom: 0.4rem;
}

.page-intro-text p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 540px;
}

.page-intro-badge {
  font-family: 'Orbitron', monospace;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid rgba(40,209,76,0.35);
  border-radius: 6px;
  padding: 0.45rem 0.85rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
  flex-shrink: 0;
  text-shadow: 0 0 12px rgba(40,209,76,0.3);
}

/* ─── PROCESS TIMELINE ───────────────────────────── */
.process-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem 1.75rem;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.process-label {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 1.4rem;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
}

.process-step {
  padding-right: 0.5rem;
}

.process-track {
  display: flex;
  align-items: center;
  margin-bottom: 0.75rem;
}

.process-num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Orbitron', monospace;
  font-size: 0.55rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.process-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, rgba(40,209,76,0.4), rgba(40,209,76,0.1));
}

.process-line.last { background: transparent; }

.process-step-title {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.process-step-desc {
  font-size: 0.67rem;
  color: var(--text-dim);
  line-height: 1.45;
}

/* ─── FORM SECTIONS ──────────────────────────────── */
.form-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid rgba(40,209,76,0.2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
  position: relative;
  transition: border-left-color 0.25s;
}

.form-section:focus-within {
  border-left-color: var(--accent);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.section-number {
  font-family: 'Orbitron', monospace;
  font-size: 0.7rem;
  font-weight: 700;
  color: #000;
  background: var(--accent);
  border-radius: 6px;
  padding: 3px 8px;
  letter-spacing: 0.06em;
  box-shadow: 0 0 10px rgba(40,209,76,0.3);
}

.section-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
}

.section-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

/* ─── GRID LAYOUTS ───────────────────────────────── */
.field-grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}
.field-grid.three-col { grid-template-columns: repeat(3, 1fr); }
.field-grid.two-col   { grid-template-columns: repeat(2, 1fr); }

.parts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.85rem;
}

/* ─── FIELD GROUPS ───────────────────────────────── */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.req { color: var(--accent); }
.optional { color: var(--text-dim); font-weight: 400; text-transform: none; letter-spacing: 0; }

input[type="text"],
input[type="tel"],
input[type="email"],
input[type="number"],
select,
textarea {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.6rem 0.85rem;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  -webkit-appearance: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder, textarea::placeholder { color: var(--text-dim); }

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%238a9080' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.2rem;
  cursor: pointer;
}

select option { background: var(--surface2); }

textarea { resize: vertical; min-height: 80px; }

.field-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 2px;
}
.field-hint.success { color: var(--accent); }
.field-hint.error   { color: var(--error);  }

/* ─── PART CARDS ─────────────────────────────────── */
.part-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  transition: border-color 0.2s;
}

.part-card:hover {
  border-color: rgba(40,209,76,0.35);
  background: #1c1c1c;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.part-label-tag {
  font-family: 'Orbitron', monospace;
  font-size: 0.6rem;
  font-weight: 700;
  color: #000;
  background: var(--accent);
  border-radius: 4px;
  padding: 2px 6px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 0.25rem;
}

.part-details {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.part-price {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 2px;
}

/* ─── WATERCOOLING ───────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.toggle-label {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}

.toggle-note {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 26px;
  flex-shrink: 0;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--border);
  border-radius: 26px;
  transition: 0.25s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  left: 3px; bottom: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: 0.25s;
}

input:checked + .toggle-slider { background: var(--accent); }
input:checked + .toggle-slider::before {
  transform: translateX(20px);
  background: #000;
}

.watercooling-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.85rem;
}

.badge-premium {
  font-size: 0.6rem;
  font-weight: 700;
  background: var(--accent);
  color: #000;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.08em;
  vertical-align: middle;
  margin-left: 0.5rem;
}

/* ─── SLIDERS ─────────────────────────────────────── */
.sliders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
}

.slider-group {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.25rem;
}

.slider-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.slider-value {
  font-family: 'Orbitron', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 1.8rem;
  text-align: right;
}

.slider-desc {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.styled-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
  cursor: pointer;
  margin: 0;
}

.styled-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(40,209,76,0.45);
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.styled-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 16px rgba(40,209,76,0.65);
}

.slider-ends {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.4rem;
}

/* ─── OPTIMIZE SECTION ───────────────────────────── */
.optimize-row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.optimize-budget-field {
  max-width: 220px;
}

.btn-optimize {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 50px;
  padding: 0.65rem 1.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-optimize:hover {
  background: var(--accent);
  color: #000;
  box-shadow: 0 4px 16px rgba(40,209,76,0.3);
}

.btn-optimize:disabled { opacity: 0.45; cursor: not-allowed; }

.optimize-result {
  margin-top: 1.25rem;
  padding: 0.85rem 1.1rem;
  background: var(--surface2);
  border: 1px solid rgba(40,209,76,0.25);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.optimize-result.error {
  border-color: rgba(255,77,109,0.3);
  color: var(--error);
}

/* ─── PRICE SUMMARY ──────────────────────────────── */
.price-breakdown {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.price-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.price-row span:last-child {
  font-weight: 600;
  color: var(--text);
}

.price-divider {
  border-top: 1px solid var(--border);
  margin: 0.5rem 0;
}

.total-row {
  font-size: 1.1rem !important;
  font-weight: 700 !important;
  color: var(--text) !important;
}

.total-row span:last-child {
  color: var(--accent) !important;
  font-size: 1.25rem;
  font-family: 'Orbitron', monospace;
  text-shadow: 0 0 18px rgba(40,209,76,0.4);
}

.price-note {
  font-size: 0.68rem;
  color: var(--text-dim);
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  margin-left: 0.35rem;
}

.price-disclaimer {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 0.75rem;
  line-height: 1.5;
}

/* ─── SUBMIT ─────────────────────────────────────── */
.submit-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 50px;
  padding: 0.9rem 2.5rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 20px rgba(40,209,76,0.25);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(40,209,76,0.4);
}

.btn-submit:active { transform: translateY(0); }
.btn-submit:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-icon { font-size: 1.1rem; transition: transform 0.2s; }
.btn-submit:hover .btn-icon { transform: translateX(4px); }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 50px;
  padding: 0.65rem 1.8rem;
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

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

.submit-note {
  font-size: 0.78rem;
  color: var(--text-dim);
  max-width: 420px;
}

/* ─── SUCCESS / ERROR STATES ──────────────────────── */
.success-box, .error-box {
  text-align: center;
  padding: 3rem 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-top: 2rem;
}

.success-box h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}

.success-box p, .error-box p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.error-box h3 { font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--error); }

.status-tag {
  display: inline-block;
  font-family: 'Orbitron', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 8px;
  padding: 0.4rem 1rem;
  margin-bottom: 1.25rem;
  letter-spacing: 0.08em;
}

.status-tag.error {
  color: var(--error);
  border-color: var(--error);
}

.hidden { display: none !important; }

/* ─── STICKY SUMMARY BAR ────────────────────────── */
.sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(14,14,14,0.96);
  border-top: 1px solid var(--accent);
  backdrop-filter: blur(10px);
  padding: 0.75rem 1.5rem;
  transition: transform 0.3s ease;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.6);
}

.sticky-bar.hidden {
  transform: translateY(100%);
}

.sticky-bar-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sticky-bar-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.sticky-bar-total {
  font-family: 'Orbitron', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 12px rgba(40,209,76,0.4);
  flex: 1;
}

.sticky-bar-btn {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: #000;
  background: var(--accent);
  border-radius: 50px;
  padding: 0.45rem 1.2rem;
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: box-shadow 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}

.sticky-bar-btn:hover {
  box-shadow: 0 4px 16px rgba(40,209,76,0.4);
}

/* ─── SECTION COMPLETION ─────────────────────────── */
.form-section.section-complete {
  border-left-color: var(--accent);
}

.section-number.done {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  box-shadow: 0 0 10px rgba(40,209,76,0.35);
}

/* ─── RESET BUTTON ───────────────────────────────── */
.btn-reset {
  margin-left: auto;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: color 0.2s;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn-reset:hover { color: var(--error); }

/* ─── FOOTER ─────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* ─── LOADING ────────────────────────────────────── */
.btn-submit.loading .btn-text::after {
  content: '...';
}

/* ─── COMPATIBILITY INDICATORS ──────────────────── */
.compat-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 3px;
  min-height: 16px;
}

.compat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--text-dim);
  transition: background 0.3s, box-shadow 0.3s;
}

.compat-dot.loading {
  background: var(--text-dim);
  animation: compat-pulse 1s ease-in-out infinite;
}

.compat-dot.ok {
  background: var(--accent);
  box-shadow: 0 0 6px rgba(40,209,76,0.55);
}

.compat-dot.warning {
  background: var(--warning);
  box-shadow: 0 0 6px rgba(255,179,71,0.55);
}

.compat-dot.error {
  background: var(--error);
  box-shadow: 0 0 6px rgba(255,77,109,0.55);
}

.compat-msg {
  font-size: 0.7rem;
  color: var(--text-dim);
  line-height: 1.3;
}

.compat-msg.warning { color: var(--warning); }
.compat-msg.error   { color: var(--error);   }

@keyframes compat-pulse {
  0%, 100% { opacity: 0.35; }
  50%       { opacity: 1;    }
}

.part-card.compat-ok      { border-color: rgba(40,209,76,0.35);  }
.part-card.compat-warning { border-color: rgba(255,179,71,0.35); }
.part-card.compat-error   { border-color: rgba(255,77,109,0.45); }

/* ─── RESPONSIVE ─────────────────────────────────── */
body.has-sticky-bar { padding-bottom: 56px; }

@media (max-width: 680px) {
  .field-grid.three-col { grid-template-columns: 1fr; }
  .field-grid.two-col   { grid-template-columns: 1fr; }
  .sliders-grid         { grid-template-columns: 1fr; }
  .parts-grid           { grid-template-columns: 1fr; }
  .watercooling-grid    { grid-template-columns: 1fr; }
  .header-inner         { flex-direction: column; align-items: flex-start; }
  .form-section         { padding: 1.25rem; }
  .logo-main            { font-size: 1rem; }
  .page-intro           { flex-direction: column; gap: 1rem; }
  .page-intro-text h1   { font-size: 1.1rem; }
  .process-steps        { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
  .process-line         { display: none; }
}