/* ============================================================
   Quantum Thinker — brand layer on top of Bootstrap 5
   Neo-brutalist: 2px ink borders, hard offset shadows,
   uppercase display headings, orange/yellow accents.
   Theming: all surface colors flow through CSS variables,
   flipped by [data-theme="dark"] on <html>.
   ============================================================ */

:root {
  /* fixed brand accents (same in both themes) */
  --qt-orange: #ff7b00;
  --qt-yellow: #ffc107;
  --qt-ink: #111111;
  --qt-paper: #fffdf7;

  /* theme-aware surfaces */
  --qt-bg: #fffdf7;
  --qt-surface: #ffffff;
  --qt-text: #111111;
  --qt-muted: #545454;
  --qt-line: #111111;
  --qt-line-soft: rgba(17, 17, 17, 0.1);
  --qt-navbar-bg: rgba(255, 253, 247, 0.95);
  --qt-error-bg: #fee2e2;
  --qt-error-text: #991b1b;

  /* hard shadows follow the line color */
  --qt-shadow: 6px 6px 0 var(--qt-line);
  --qt-shadow-sm: 4px 4px 0 var(--qt-line);
  --qt-shadow-orange: 8px 8px 0 var(--qt-orange);
  --qt-shadow-orange-sm: 4px 4px 0 var(--qt-orange);
  --qt-shadow-yellow: 8px 8px 0 var(--qt-yellow);

  --qt-font-display: "Space Grotesk", "Archivo", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --qt-font-body: "Archivo", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  color-scheme: light;
}

[data-theme="dark"] {
  --qt-bg: #171512;
  --qt-surface: #232019;
  --qt-text: #fffdf7;
  --qt-muted: #b6ad9e;
  --qt-line: #fffdf7;
  --qt-line-soft: rgba(255, 253, 247, 0.18);
  --qt-navbar-bg: rgba(23, 21, 18, 0.95);
  --qt-error-bg: #4c1d1d;
  --qt-error-text: #fecaca;
  color-scheme: dark;
}

html { scroll-behavior: smooth; }

body {
  background: var(--qt-bg);
  color: var(--qt-text);
  font-family: var(--qt-font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

h1, h2, h3, h4, h5 {
  font-family: var(--qt-font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  text-wrap: balance;
}

::selection { background: var(--qt-yellow); color: var(--qt-ink); }

:focus-visible { outline: 3px solid var(--qt-orange); outline-offset: 2px; border-radius: 2px; }

/* ---------- layout helpers ---------- */
.container-qt { max-width: 80rem; margin-inline: auto; padding-inline: 1rem; }
@media (min-width: 576px) { .container-qt { padding-inline: 1.5rem; } }
.container-qt-narrow { max-width: 56rem; margin-inline: auto; padding-inline: 1rem; }
@media (min-width: 576px) { .container-qt-narrow { padding-inline: 1.5rem; } }

.section-pad { padding-block: 4rem; }
@media (min-width: 992px) { .section-pad { padding-block: 6rem; } }
.section-pad-sm { padding-block: 4rem; }
@media (min-width: 992px) { .section-pad-sm { padding-block: 5rem; } }

/* ---------- brand utilities ---------- */
.font-display { font-family: var(--qt-font-display); }
.text-qt-orange { color: var(--qt-orange) !important; }
.text-qt-yellow { color: var(--qt-yellow) !important; }
.text-qt-grey { color: var(--qt-muted) !important; }
.text-qt-paper { color: var(--qt-paper) !important; }
.bg-qt-orange { background-color: var(--qt-orange) !important; }
.bg-qt-yellow { background-color: var(--qt-yellow) !important; color: var(--qt-ink); }
.bg-qt-ink { background-color: var(--qt-ink) !important; color: var(--qt-paper); }
.bg-qt-paper { background-color: var(--qt-bg) !important; }
/* white surfaces follow the theme */
.bg-white { background-color: var(--qt-surface) !important; }
.border-qt { border: 2px solid var(--qt-line) !important; }
.border-b-qt { border-bottom: 2px solid var(--qt-line) !important; }
.border-t-qt { border-top: 2px solid var(--qt-line) !important; }
.border-y-qt { border-top: 2px solid var(--qt-line) !important; border-bottom: 2px solid var(--qt-line) !important; }
.shadow-hard { box-shadow: var(--qt-shadow); }
.shadow-hard-sm { box-shadow: var(--qt-shadow-sm); }
.shadow-hard-orange { box-shadow: var(--qt-shadow-orange); }
.shadow-hard-orange-sm { box-shadow: var(--qt-shadow-orange-sm); }
.shadow-hard-yellow { box-shadow: var(--qt-shadow-yellow); }

.kicker {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--qt-font-display); font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.22em; color: var(--qt-orange);
}
.kicker::before { content: ""; display: inline-block; width: 0.625rem; height: 0.625rem; background: var(--qt-orange); }

.card-brutal { border: 2px solid var(--qt-line); background: var(--qt-surface); }

.highlight {
  background: var(--qt-yellow); color: var(--qt-ink); padding-inline: 0.25rem;
  box-decoration-break: clone; -webkit-box-decoration-break: clone;
}

/* ---------- buttons ---------- */
.btn-qt {
  display: inline-flex; min-height: 44px; cursor: pointer; align-items: center; justify-content: center;
  gap: 0.5rem; border: 2px solid var(--qt-line); padding: 0.75rem 1.5rem;
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em; text-decoration: none;
  transition: all 0.2s ease-out; border-radius: 0; color: var(--qt-text); background: var(--qt-surface);
}
.btn-qt-primary { background: var(--qt-orange); color: #fff; box-shadow: var(--qt-shadow-sm); }
.btn-qt-primary:hover { transform: translateY(-2px); box-shadow: var(--qt-shadow); color: #fff; }
.btn-qt-primary:active { transform: translateY(0); box-shadow: none; color: #fff; }
.btn-qt-dark { background: var(--qt-ink); color: var(--qt-paper); box-shadow: var(--qt-shadow-orange-sm); }
.btn-qt-dark:hover { transform: translateY(-2px); box-shadow: var(--qt-shadow-orange); color: var(--qt-paper); }
.btn-qt-dark:active { transform: translateY(0); box-shadow: none; color: var(--qt-paper); }
.btn-qt-ghost { background: transparent; color: var(--qt-text); }
.btn-qt-ghost:hover { background: var(--qt-yellow); color: var(--qt-ink); }
.btn-qt-yellow { background: var(--qt-yellow); color: var(--qt-ink); box-shadow: var(--qt-shadow-sm); }
.btn-qt-yellow:hover { transform: translateY(-2px); box-shadow: var(--qt-shadow); color: var(--qt-ink); }
.btn-qt-sm { min-height: 40px; padding: 0.5rem 1.25rem; }

/* ---------- forms ---------- */
.field-qt {
  display: block; width: 100%; border: 2px solid var(--qt-line); border-radius: 0;
  background: var(--qt-surface); padding: 0.75rem 1rem; font-size: 1rem; color: var(--qt-text);
}
.field-qt::placeholder { color: var(--qt-muted); opacity: 0.75; }
.field-qt:focus { border-color: var(--qt-orange); outline: none; box-shadow: none; }
.label-qt {
  display: block; margin-bottom: 0.375rem; font-family: var(--qt-font-display);
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.15em;
}
.hp-field { position: absolute; left: -9999px; top: -9999px; }
.alert-qt-error {
  border: 2px solid var(--qt-line); background: var(--qt-error-bg); color: var(--qt-error-text);
  padding: 0.5rem 1rem; font-size: 0.875rem; font-weight: 500;
}

/* ---------- navbar ---------- */
.qt-navbar {
  position: sticky; top: 0; z-index: 1030;
  border-bottom: 2px solid var(--qt-line);
  background: var(--qt-navbar-bg); backdrop-filter: blur(8px);
}
.qt-navbar .nav-link-qt {
  display: inline-block; padding: 0.5rem 0.75rem;
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em; color: var(--qt-text); text-decoration: none;
  transition: color 0.2s;
}
.qt-navbar .nav-link-qt:hover, .qt-navbar .nav-link-qt.active { color: var(--qt-orange); }
.qt-logo { font-family: var(--qt-font-display); font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; text-transform: lowercase; text-decoration: none; color: var(--qt-text); }
@media (min-width: 576px) { .qt-logo { font-size: 1.5rem; } }
.qt-logo .accent { color: var(--qt-orange); }
.qt-logo.light { color: var(--qt-paper); }

.qt-dropdown-menu {
  border: 2px solid var(--qt-line); border-radius: 0; box-shadow: var(--qt-shadow);
  padding: 0; min-width: 18rem; background: var(--qt-surface); margin-top: 0.25rem !important;
}
.qt-dropdown-menu .dropdown-item { padding: 0.75rem 1rem; border-bottom: 2px solid var(--qt-line-soft); white-space: normal; color: var(--qt-text); }
.qt-dropdown-menu .dropdown-item:last-child { border-bottom: 0; }
.qt-dropdown-menu .dropdown-item:hover, .qt-dropdown-menu .dropdown-item:focus { background: rgba(255, 193, 7, 0.3); color: var(--qt-text); }
.qt-dropdown-menu.lang { min-width: 11rem; padding: 0.25rem 0; }
.qt-dropdown-menu.lang .dropdown-item {
  border-bottom: 0; font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700; padding: 0.625rem 1rem;
}
.qt-dropdown-menu.lang .dropdown-item.active-lang { background: rgba(255, 193, 7, 0.2); color: var(--qt-orange); }

.qt-lang-btn {
  display: inline-flex; min-height: 40px; align-items: center; gap: 0.5rem;
  border: 2px solid var(--qt-line); background: var(--qt-surface); color: var(--qt-text); padding: 0.375rem 0.75rem;
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em; border-radius: 0;
}
.qt-lang-btn:hover { background: rgba(255, 193, 7, 0.3); color: var(--qt-text); }
.qt-lang-btn::after { display: none; }

.qt-theme-btn {
  display: inline-flex; min-height: 40px; min-width: 40px; align-items: center; justify-content: center;
  border: 2px solid var(--qt-line); background: var(--qt-surface); color: var(--qt-text);
  padding: 0.375rem 0.5rem; border-radius: 0; cursor: pointer;
}
.qt-theme-btn:hover { background: rgba(255, 193, 7, 0.3); }
.qt-theme-btn .icon-sun { display: none; }
[data-theme="dark"] .qt-theme-btn .icon-sun { display: block; }
[data-theme="dark"] .qt-theme-btn .icon-moon { display: none; }

.qt-toggler {
  display: inline-flex; width: 44px; height: 44px; cursor: pointer; align-items: center; justify-content: center;
  border: 2px solid var(--qt-line); background: var(--qt-bg); color: var(--qt-text); border-radius: 0;
}
.qt-mobile-menu { border-top: 2px solid var(--qt-line); background: var(--qt-bg); }
.qt-mobile-menu .m-link {
  display: block; padding: 0.75rem 0; font-family: var(--qt-font-display);
  font-size: 1rem; font-weight: 700; text-transform: uppercase; color: var(--qt-text); text-decoration: none;
}
.qt-mobile-menu .m-link:hover { color: var(--qt-orange); }
.qt-mobile-menu .m-link.sub { padding-left: 0.75rem; }
.qt-mobile-menu .m-label {
  padding-top: 0.75rem; font-family: var(--qt-font-display); font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.15em; color: var(--qt-muted);
}
.qt-mobile-lang {
  min-height: 44px; border: 2px solid var(--qt-line); background: var(--qt-surface); padding: 0.5rem 1rem;
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700; border-radius: 0;
  text-decoration: none; color: var(--qt-text); display: inline-flex; align-items: center;
}
.qt-mobile-lang:hover { background: rgba(255, 193, 7, 0.3); color: var(--qt-text); }
.qt-mobile-lang.active-lang { background: var(--qt-orange); color: #fff; }

/* ---------- hero type scale ---------- */
.h-display { font-size: 2.25rem; font-weight: 700; text-transform: uppercase; line-height: 1.05; }
@media (min-width: 576px) { .h-display { font-size: 3rem; } }
@media (min-width: 992px) { .h-display { font-size: 3.75rem; } }
.h-section { font-size: 1.875rem; font-weight: 700; text-transform: uppercase; }
@media (min-width: 576px) { .h-section { font-size: 2.25rem; } }
.lead-qt { font-size: 1.125rem; color: var(--qt-muted); }

/* ---------- marquee ---------- */
.marquee-band { overflow: hidden; border-bottom: 2px solid var(--qt-line); background: var(--qt-ink); padding-block: 0.75rem; }
.marquee-track { display: flex; width: max-content; animation: qt-marquee 28s linear infinite; }
.marquee-track span.item {
  display: flex; flex-shrink: 0; align-items: center; gap: 1.5rem; padding-inline: 1.5rem;
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.15em; color: var(--qt-paper);
}
@keyframes qt-marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- faq details ---------- */
details.faq-qt summary {
  display: flex; cursor: pointer; list-style: none; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1.25rem; font-family: var(--qt-font-display); font-size: 1rem;
  font-weight: 700; text-transform: uppercase;
}
details.faq-qt summary::-webkit-details-marker { display: none; }
details.faq-qt summary .plus {
  flex-shrink: 0; font-family: var(--qt-font-display); font-size: 1.5rem; font-weight: 700;
  color: var(--qt-orange); transition: transform 0.2s;
}
details.faq-qt[open] summary .plus { transform: rotate(45deg); }
details.faq-qt[open] { box-shadow: var(--qt-shadow-orange-sm); }
details.faq-qt .faq-body { border-top: 2px solid var(--qt-line-soft); padding: 1rem 1.25rem 1.25rem; color: var(--qt-muted); }

/* ---------- dashboard mock ---------- */
.dash-chrome { display: flex; align-items: center; gap: 0.5rem; border-bottom: 2px solid var(--qt-line); background: var(--qt-ink); padding: 0.625rem 1rem; }
.dash-dot { width: 0.75rem; height: 0.75rem; border-radius: 50%; }
.dash-side { border-right: 2px solid var(--qt-line-soft); }
.dash-row { border: 2px solid var(--qt-line-soft); }

/* ---------- scroll reveal (hidden state applied by JS only) ---------- */
.reveal-armed { opacity: 0; transform: translateY(24px) scale(0.98); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.reveal-armed.is-visible { opacity: 1; transform: translateY(0) scale(1); }

/* ---------- footer ---------- */
.qt-footer { border-top: 2px solid var(--qt-line); background: var(--qt-ink); color: var(--qt-paper); }
.qt-footer h2 { font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.15em; color: var(--qt-yellow); }
.qt-footer a.f-link { color: #d4d4d4; text-decoration: none; font-size: 0.875rem; transition: color 0.2s; }
.qt-footer a.f-link:hover { color: var(--qt-orange); }
.qt-footer .bottom-bar { border-top: 1px solid #404040; }
.qt-footer .bottom-bar a { color: #a3a3a3; text-decoration: none; }
.qt-footer .bottom-bar a:hover { color: var(--qt-orange); }

/* ---------- misc ---------- */
.hover-lift { transition: transform 0.2s; }
.hover-lift:hover { transform: translateY(-4px); }
.ul-qt { list-style: none; padding-left: 0; }
.ul-qt li { display: flex; align-items: flex-start; gap: 0.75rem; margin-bottom: 0.75rem; }
.ul-qt li::before { content: ""; flex-shrink: 0; width: 0.75rem; height: 0.75rem; margin-top: 0.4rem; background: var(--qt-orange); }

.text-qt-n300 { color: #d4d4d4 !important; }
.text-qt-n400 { color: #a3a3a3 !important; }
.text-orange-50 { color: #fff3e6 !important; }

.link-more {
  display: inline-flex; align-items: center; gap: 0.5rem; margin-top: 1.5rem;
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em; color: var(--qt-text);
  text-decoration: underline; text-decoration-color: var(--qt-orange);
  text-decoration-thickness: 4px; text-underline-offset: 4px; transition: color 0.2s;
}
.link-more:hover { color: var(--qt-orange); }

.why-card { height: 100%; border: 2px solid rgba(255, 253, 247, 0.25); padding: 1.5rem; transition: border-color 0.2s; }
.why-card:hover { border-color: var(--qt-orange); }
.why-card h3 { color: var(--qt-paper); }

.pain-card { height: 100%; border-left: 4px solid var(--qt-orange); background: var(--qt-surface); padding: 1.5rem; box-shadow: var(--qt-shadow-sm); }

.btn-qt-hero-primary { background: var(--qt-orange); color: #fff; border-color: var(--qt-paper); box-shadow: var(--qt-shadow-yellow); }
.btn-qt-hero-primary:hover { transform: translateY(-2px); color: #fff; }
.btn-qt-hero-ghost { background: transparent; color: var(--qt-paper); border-color: var(--qt-paper); }
.btn-qt-hero-ghost:hover { background: var(--qt-yellow); color: var(--qt-ink); }

.footer-cta { border-color: var(--qt-paper) !important; background: var(--qt-orange); color: #fff; box-shadow: var(--qt-shadow-yellow); }
.footer-cta:hover { transform: translateY(-2px); color: #fff; }

.value-num {
  display: flex; width: 2.5rem; height: 2.5rem; flex-shrink: 0; align-items: center; justify-content: center;
  border: 2px solid var(--qt-ink); background: var(--qt-yellow); color: var(--qt-ink);
  font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700;
}
.step-tag { display: inline-block; background: var(--qt-yellow); color: var(--qt-ink); padding: 0.25rem 0.5rem; font-family: var(--qt-font-display); font-size: 0.875rem; font-weight: 700; }
.deliver-tick { display: inline-block; width: 2rem; height: 0.75rem; background: var(--qt-orange); }

.contact-card { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem; text-decoration: none; color: var(--qt-text); }
.contact-card h1, .contact-card h2, .contact-card h3 { color: inherit; }
.dropdown-caret { transition: transform 0.2s; }
[data-bs-toggle="dropdown"][aria-expanded="true"] .dropdown-caret { transform: rotate(180deg); }

/* safety: no horizontal scroll from wide-gutter rows */
html, body { overflow-x: clip; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body { transition: none; }
  .reveal-armed { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none; }
  .btn-qt, .hover-lift { transition: none; }
}

/* contact cards: let long addresses shrink/wrap on narrow screens */
.contact-card > span { min-width: 0; }
.contact-card .fs-5 { overflow-wrap: anywhere; }