/* ============================================================
   Quanshium AI Core Components
   ============================================================ */

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.85rem 1.6rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  min-height: 44px;
}
.btn svg { width: 1.1em; height: 1.1em; flex-shrink: 0; }
@media (max-width: 480px) {
  .btn { white-space: normal; text-align: center; line-height: 1.25; }
}

/* Lucide icon sizes */
.icon--xs { width: 14px; height: 14px; }
.icon--sm { width: 16px; height: 16px; }
.icon--md { width: 22px; height: 22px; }
.mega-item .mi-icon svg { width: 22px; height: 22px; }
.btn:focus-visible { outline: 2px solid var(--quantum-cyan); outline-offset: 3px; }

.btn--primary {
  background: var(--saffron-500);
  color: #fff;
}
.btn--primary:hover { background: var(--saffron-600); color: #fff; }

.btn--secondary {
  background: transparent;
  color: var(--text-on-dark);
  border-color: var(--border-strong);
}
.btn--secondary:hover { border-color: var(--text-on-dark-dim); background: rgba(255, 255, 255, 0.04); color: var(--text-on-dark); }

.btn--ghost { background: transparent; color: var(--quantum-cyan); padding-inline: 0.25rem; }
.btn--ghost:hover { color: var(--saffron-400); }

.section--paper .btn--secondary { color: var(--navy-900); border-color: var(--border-strong); background: #fff; }
.section--paper .btn--secondary:hover { border-color: var(--saffron-500); color: var(--navy-900); }

.btn--lg { padding: 1.05rem 2rem; font-size: 1.05rem; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

/* ── Header ──
   Note: do not put backdrop-filter/transform/filter on .site-header itself —
   those create a containing block that breaks position:fixed descendants
   (the mobile menu). Use solid translucent backgrounds instead. */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(6, 13, 26, 0.92);
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
  overflow: visible;
}
.site-header.is-scrolled {
  background: rgba(6, 13, 26, 0.97);
  border-bottom-color: var(--border-subtle);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  height: 76px;
}
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand:hover { color: var(--text-on-dark); }
.brand-logo {
  display: block;
  width: auto;
  height: auto;
  object-fit: contain;
}
/* logo.png is a light full-mark (transparent) sized for dark chrome */
.brand-logo--emblem {
  height: 44px;
  width: auto;
  max-width: min(168px, 42vw);
}
.brand-logo--full {
  height: 64px;
  width: auto;
  max-width: min(220px, 55vw);
}

.main-nav { display: flex; align-items: center; gap: 0.3rem; }
.main-nav a {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-size: 0.9rem; font-weight: 500; color: var(--text-on-dark-dim);
  padding: 0.5rem 0.85rem; border-radius: var(--radius-sm);
  min-height: 40px;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--text-on-dark); background: rgba(255,255,255,0.04); }
.main-nav a:focus-visible,
.nav-toggle:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--quantum-cyan);
  outline-offset: 3px;
}
.has-dropdown { position: relative; }
.has-dropdown::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 12px;
}
.dropdown-toggle svg { width: 12px; height: 12px; transition: transform var(--transition-fast); opacity: 0.7; }
.has-dropdown:hover .dropdown-toggle svg,
.has-dropdown.is-open .dropdown-toggle svg { transform: rotate(180deg); }

.mega {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(8px);
  min-width: 540px;
  z-index: 110;
  background: var(--surface-card-solid);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 1.25rem;
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}
.has-dropdown:hover .mega,
.has-dropdown:focus-within .mega,
.has-dropdown.is-open .mega {
  opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0);
}
.mega-item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.7rem 0.8rem; border-radius: var(--radius-md); color: inherit; }
.mega-item:hover { background: rgba(54, 198, 255, 0.07); color: inherit; }
.mega-item:focus-visible { outline: 2px solid var(--quantum-cyan); outline-offset: 0; background: rgba(54, 198, 255, 0.07); }
.mega-item .mi-icon { color: var(--quantum-cyan); width: 22px; flex-shrink: 0; }
.mega-item > span:last-child { display: flex; flex-direction: column; gap: 0.15rem; }
.mega-item .mi-title { display: block; color: var(--text-on-dark); font-weight: 600; font-size: 0.9rem; }
.mega-item .mi-desc { display: block; color: var(--text-on-dark-faint); font-size: 0.78rem; line-height: 1.4; }

.header-cta { display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0; }
.nav-toggle { display: none; background: none; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); width: 44px; height: 44px; align-items: center; justify-content: center; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text-on-dark); position: relative; transition: var(--transition-fast); }
.nav-toggle span::before, .nav-toggle span::after { content: ''; position: absolute; left: 0; width: 20px; height: 2px; background: var(--text-on-dark); transition: var(--transition-fast); }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
body.menu-open .nav-toggle span { background: transparent; }
body.menu-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
body.menu-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

/* Mobile menu — lives on document.body (moved by JS) so fixed positioning
   is viewport-relative even if the header gains filters later. */
.mobile-menu {
  display: none;
}
@media (max-width: 1024px) {
  .main-nav { display: none; }
  /* Primary CTA lives in the drawer — free header space for logo + toggle */
  .header-cta .btn { display: none; }
  .nav-toggle { display: inline-flex; }

  .mobile-menu {
    display: block;
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 150;
    width: 100%;
    max-width: 100vw;
    margin: 0;
    background: rgba(6, 13, 26, 0.98);
    padding: 1.5rem clamp(1.25rem, 5vw, 3rem) 3rem;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    transform: translate3d(100%, 0, 0);
    transition: transform 0.3s var(--ease), visibility 0.3s var(--ease);
    visibility: hidden;
    pointer-events: none;
  }
  body.menu-open .mobile-menu {
    transform: translate3d(0, 0, 0);
    visibility: visible;
    pointer-events: auto;
  }
  .mobile-menu a {
    display: block;
    padding: 1rem 0;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-on-dark);
    border-bottom: 1px solid var(--border-subtle);
  }
  .mobile-menu a:not(.btn)[aria-current="page"] { color: var(--quantum-cyan); }
  .mobile-menu a:focus-visible {
    outline: 2px solid var(--quantum-cyan);
    outline-offset: 2px;
  }
  .mobile-menu .btn {
    display: flex;
    width: 100%;
    margin-top: 1.5rem;
    white-space: nowrap;
  }
}
@media (min-width: 1025px) {
  .mobile-menu { display: none !important; }
}

/* ── Cards ── */
.card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
a.card {
  color: inherit;
  text-decoration: none;
}
a.card:hover { border-color: var(--border-strong); color: inherit; }
a.card:focus-visible,
.card__link:focus-visible {
  outline: 2px solid var(--quantum-cyan);
  outline-offset: 3px;
}
.card__icon {
  width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  color: var(--quantum-cyan);
  background: rgba(157, 176, 204, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
}
.card__icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.2rem; margin-bottom: var(--space-2); }
.card p { font-size: 0.95rem; }
.card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: var(--space-4);
  font-weight: 600;
  font-size: 0.88rem;
  font-family: var(--font-display);
  color: var(--quantum-cyan);
}
.card__link:hover { color: var(--saffron-400); }
.card__link svg { width: 14px; height: 14px; }

/* Vertical accent variants */
.card--saffron::before { content:''; position:absolute; inset:0 auto 0 0; width:3px; background: var(--saffron-500); opacity:.8; }
.card--cyan::before { content:''; position:absolute; inset:0 auto 0 0; width:3px; background: var(--quantum-cyan); opacity:.8; }
.card--green::before { content:''; position:absolute; inset:0 auto 0 0; width:3px; background: var(--green-500); opacity:.8; }

.section--paper .card { background: #fff; border-color: rgba(10, 26, 51, 0.1); box-shadow: var(--shadow-sm); }
.section--paper a.card:hover { border-color: var(--saffron-500); }
.section--paper a.card:focus-visible { outline-color: var(--saffron-500); }
.section--paper .card p { color: var(--text-on-light-dim); }
.section--paper .card h3,
.section--paper .card h4 { color: var(--text-on-light); }
.section--paper .card__icon { background: rgba(30,115,255,0.08); color: var(--quantum-blue); }
.section--paper .card__link { color: var(--quantum-blue); }
.section--paper .card__link:hover { color: var(--saffron-600); }

/* Grids */
.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ── Status chip / pill / tag ── */
.chip {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.3rem 0.7rem; border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle); color: var(--text-on-dark-dim);
  white-space: nowrap;
  flex-shrink: 0;
}
.chip--live { color: var(--green-500); border-color: rgba(27,163,70,0.4); }
.chip--live::before { content:''; width:6px; height:6px; border-radius:50%; background: var(--green-500); flex-shrink: 0; }
.chip--dev { color: var(--quantum-cyan); border-color: var(--border-accent); }
.chip--roadmap { color: var(--saffron-400); border-color: var(--border-saffron); }

/* Chips on light surfaces need darker borders/text */
.section--paper .chip {
  color: var(--text-on-light-dim);
  border-color: rgba(10, 26, 51, 0.16);
  background: rgba(10, 26, 51, 0.03);
}
.section--paper .chip--live { color: var(--green-700); border-color: rgba(15, 122, 46, 0.35); background: rgba(15, 122, 46, 0.06); }
.section--paper .chip--dev { color: var(--quantum-blue); border-color: rgba(30, 115, 255, 0.35); background: rgba(30, 115, 255, 0.06); }
.section--paper .chip--roadmap { color: var(--saffron-600); border-color: rgba(232, 92, 16, 0.4); background: rgba(232, 92, 16, 0.06); }

.tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--quantum-cyan);
  background: rgba(30,115,255,0.1); padding: 0.25rem 0.6rem; border-radius: var(--radius-sm);
}
.section--paper .tag {
  color: var(--quantum-blue);
  background: rgba(30, 115, 255, 0.1);
}

/* ── Spec table / accordion ── */
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table th, .spec-table td { text-align: left; padding: 0.85rem 1rem; border-bottom: 1px solid var(--border-subtle); vertical-align: top; }
.spec-table th { font-family: var(--font-display); font-weight: 600; color: var(--text-on-dark); width: 38%; font-size: 0.92rem; }
.spec-table td { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-on-dark-dim); word-break: break-word; }
@media (max-width: 600px) {
  .spec-table th, .spec-table td { display: block; width: 100%; padding: 0.55rem 0; }
  .spec-table th { padding-top: 0.9rem; border-bottom: none; }
  .spec-table tr { border-bottom: 1px solid var(--border-subtle); }
  .spec-table tr:last-child { border-bottom: none; }
  .spec-table td { border-bottom: none; padding-bottom: 0.9rem; }
}

.accordion__item { border: 1px solid var(--border-subtle); border-radius: var(--radius-md); margin-bottom: 0.75rem; overflow: hidden; background: var(--surface-card); }
.accordion__btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: none; border: none; padding: 1.15rem 1.35rem; text-align: left;
  font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; color: var(--text-on-dark);
  cursor: pointer;
  min-height: 52px;
}
.accordion__btn:focus-visible { outline: 2px solid var(--quantum-cyan); outline-offset: -2px; }
.accordion__btn .acc-icon { flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--border-strong); display: grid; place-items: center; transition: transform var(--transition-fast); color: var(--quantum-cyan); }
.accordion__btn[aria-expanded="true"] .acc-icon { transform: rotate(45deg); border-color: var(--quantum-cyan); }
.accordion__panel { max-height: 0; overflow: hidden; transition: max-height var(--transition); }
.accordion__panel p { padding: 0 1.35rem 1.25rem; font-size: 0.95rem; }

/* ── Forms ── */
.field { margin-bottom: var(--space-4); }
.field label { display: block; font-family: var(--font-display); font-size: 0.82rem; font-weight: 600; letter-spacing: 0.02em; color: var(--text-on-dark); margin-bottom: 0.45rem; }
.field .req { color: var(--saffron-500); }
.field input, .field select, .field textarea {
  width: 100%;
  min-height: 48px;
  padding: 0.85rem 1rem;
  font-size: 1rem; /* 16px avoids iOS zoom-on-focus */
  color: var(--text-on-dark);
  background: rgba(6,13,26,0.5);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder, .field textarea::placeholder { color: var(--text-on-dark-faint); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--border-accent);
  box-shadow: 0 0 0 3px var(--quantum-glow);
}
.field.has-error input,
.field.has-error select,
.field.has-error textarea {
  border-color: rgba(255, 122, 122, 0.85);
  background: rgba(77, 20, 32, 0.32);
}
.field.has-error input:focus,
.field.has-error select:focus,
.field.has-error textarea:focus {
  border-color: #ff7a7a;
  box-shadow: 0 0 0 3px rgba(255, 122, 122, 0.18);
}
.field-error {
  display: block;
  min-height: 1rem;
  margin-top: 0.4rem;
  color: #ff9a9a;
  font-size: 0.78rem;
  line-height: 1.35;
}
.field--select .select-wrap { position: relative; display: block; }
.field--select .select-wrap::after {
  content: '';
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  pointer-events: none;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid #5d728f;
}
.field--select select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 2.75rem;
}
.field--select select:invalid { color: var(--text-on-dark-faint); }
.field--select select option { color: var(--text-on-light); background: var(--paper-50); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.form-message {
  margin-top: var(--space-3);
  font-size: 0.9rem;
  min-height: 1.2rem;
  line-height: 1.5;
}
.form-message.success,
.form-message.error {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}
.form-message.success {
  color: var(--green-500);
  background: rgba(27, 163, 70, 0.1);
  border-color: rgba(27, 163, 70, 0.35);
}
.form-message.error {
  color: #ff9a9a;
  background: rgba(255, 122, 122, 0.1);
  border-color: rgba(255, 122, 122, 0.35);
}
.honeypot { position: absolute; left: -9999px; }

/* ── Footer ── */
.site-footer { background: var(--ink-950); border-top: 1px solid var(--border-subtle); padding-top: var(--space-8); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: var(--space-6); padding-bottom: var(--space-7); }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand .brand { margin-bottom: var(--space-4); }
.footer-tagline { font-size: 0.9rem; color: var(--text-on-dark-dim); margin-bottom: var(--space-3); }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-on-dark-faint); margin-bottom: var(--space-4); font-weight: 500; }
.footer-col ul li { margin-bottom: 0.35rem; }
.footer-col a {
  display: inline-block;
  color: var(--text-on-dark-dim);
  font-size: 0.9rem;
  padding: 0.3rem 0;
  min-height: 36px;
}
.footer-col a:hover { color: var(--quantum-cyan); }
.footer-col a:focus-visible {
  outline: 2px solid var(--quantum-cyan);
  outline-offset: 2px;
  border-radius: 2px;
}
.footer-recognitions { display: flex; flex-wrap: wrap; gap: 0.75rem; padding: var(--space-5) 0; border-top: 1px solid var(--border-subtle); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); align-items: center; padding: var(--space-5) 0; border-top: 1px solid var(--border-subtle); }
.footer-bottom p { font-size: 0.8rem; color: var(--text-on-dark-faint); }
.footer-desc { font-size: 0.9rem; max-width: 300px; }
.footer-location { color: var(--text-on-dark-dim); font-size: 0.9rem; }
.footer-legal { display: flex; gap: 1.25rem; align-items: center; }
.footer-legal a, .footer-legal span { font-size: 0.8rem; color: var(--text-on-dark-faint); }
.footer-legal a:hover { color: var(--quantum-cyan); }

/* ── Layout utilities ── */
.btn-row { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.btn-row--center { justify-content: center; }
@media (max-width: 480px) {
  .btn-row > .btn { flex: 1 1 100%; }
}
.grid--align-start { align-items: start; }
.text-center { text-align: center; }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-7 { margin-top: var(--space-7); }
.mb-5 { margin-bottom: var(--space-5); }
.btn--block { width: 100%; }
.chip-row { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: var(--space-5); }

/* ── CTA band ── */
.cta-band {
  border: 1px solid var(--border-subtle); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--navy-800), var(--navy-900));
  padding: clamp(2.5rem, 6vw, 4.5rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.cta-band::after {
  content: '';
  position: absolute; inset: 0 auto auto 50%; transform: translateX(-50%);
  width: min(320px, 60%); height: 2px;
  background: linear-gradient(90deg, transparent, var(--saffron-500), transparent);
}
.cta-band > * { position: relative; }
.cta-band h2 { font-size: var(--fs-h2); margin-bottom: var(--space-4); }
.cta-band p { font-size: var(--fs-body-lg); max-width: 600px; margin: 0 auto var(--space-6); }
.cta-band .btn-row { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
@media (max-width: 480px) {
  .cta-band { padding: 2rem 1.25rem; }
  .cta-band .btn-row > .btn { flex: 1 1 100%; }
}

/* ── Breadcrumb ── */
.breadcrumb { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-on-dark-faint); padding-top: 110px; }
.breadcrumb a { color: var(--text-on-dark-dim); }
.breadcrumb span { margin: 0 0.5rem; opacity: 0.5; }