/* ============================================================================
   components.css — reusable UI pieces. Consume semantic tokens only.
   ========================================================================== */

/* -------- Buttons -------- */
.btn {
  --btn-h: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: var(--btn-h);
  padding-inline: var(--space-5);
  border-radius: var(--radius);
  font-weight: var(--fw-semi);
  font-size: var(--fs-sm);
  line-height: 1;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn--primary { background: var(--color-primary); color: var(--color-primary-contrast); box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--color-primary-hover); box-shadow: var(--shadow-md); }

.btn--ghost { background: transparent; color: var(--color-text); border-color: var(--color-border-strong); }
.btn--ghost:hover { background: var(--color-bg-subtle); border-color: var(--color-text-subtle); }

.btn--invert { background: var(--color-invert-text); color: var(--color-invert-bg); }
.btn--invert:hover { background: color-mix(in srgb, var(--color-invert-text) 88%, transparent); }

.btn--sm { --btn-h: 36px; padding-inline: var(--space-4); font-size: var(--fs-sm); }
.btn--lg { --btn-h: 52px; padding-inline: var(--space-6); font-size: var(--fs-md); }
.btn--block { width: 100%; }

/* -------- Brand -------- */
.brand { display: inline-flex; align-items: center; gap: var(--space-2); }
.brand__mark { display: inline-flex; }
.brand__name { font-family: var(--font-display); font-weight: var(--fw-x); font-size: var(--fs-lg); letter-spacing: var(--tracking-tight); }

/* -------- Primary nav (desktop) -------- */
.nav-primary { display: none; margin-left: auto; }
.nav-primary__list { display: flex; align-items: center; gap: var(--space-1); }
.nav-primary__item { position: relative; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.nav-link:hover { color: var(--color-text); background: var(--color-bg-subtle); }
.nav-link.is-active { color: var(--color-primary); }
.nav-link__caret { font-size: 0.7em; transition: transform var(--dur-fast) var(--ease); }

/* Submenu (parent → children); revealed on hover or keyboard focus */
.submenu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  padding: var(--space-2);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility var(--dur-fast);
}
.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu,
.has-submenu[data-open="true"] .submenu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.has-submenu:hover .nav-link__caret,
.has-submenu:focus-within .nav-link__caret { transform: rotate(180deg); }
.submenu__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}
.submenu__link:hover { background: var(--color-bg-subtle); color: var(--color-text); }

/* -------- Nav actions -------- */
.nav-actions { display: flex; align-items: center; gap: var(--space-2); margin-left: auto; }
.nav-cta { display: none; }

/* -------- Language switcher -------- */
.lang-switch { position: relative; }
.lang-switch__toggle {
  display: inline-flex; align-items: center; gap: var(--space-2);
  height: 40px; padding-inline: var(--space-3);
  border-radius: var(--radius); border: 1px solid var(--color-border);
  font-size: var(--fs-sm); color: var(--color-text-muted);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.lang-switch__toggle:hover { color: var(--color-text); border-color: var(--color-border-strong); }
.lang-switch__current { display: none; }
.lang-switch__menu {
  position: absolute; top: calc(100% + 8px); right: 0;
  min-width: 160px; padding: var(--space-2);
  background: var(--color-surface-raised); border: 1px solid var(--color-border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility var(--dur-fast);
}
.lang-switch[data-open="true"] .lang-switch__menu,
.lang-switch:focus-within .lang-switch__menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-switch__link { display: block; padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm); font-size: var(--fs-sm); color: var(--color-text-muted); }
.lang-switch__link:hover { background: var(--color-bg-subtle); color: var(--color-text); }
.lang-switch__link.is-active { color: var(--color-primary); font-weight: var(--fw-semi); }

/* -------- Theme toggle -------- */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--radius);
  border: 1px solid var(--color-border); color: var(--color-text-muted);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-border-strong); }
.theme-toggle__icon { font-size: 1rem; line-height: 1; }
.theme-toggle__icon--moon { display: none; }
[data-theme="dark"] .theme-toggle__icon--sun { display: none; }
[data-theme="dark"] .theme-toggle__icon--moon { display: inline; }

/* -------- Hamburger -------- */
.hamburger {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; border-radius: var(--radius);
  border: 1px solid var(--color-border);
}
.hamburger span { display: block; width: 18px; height: 2px; margin-inline: auto; background: var(--color-text); border-radius: 2px; transition: transform var(--dur) var(--ease), opacity var(--dur-fast) var(--ease); }
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* -------- Mobile drawer -------- */
.drawer { position: fixed; inset: 0; z-index: var(--z-drawer); }
.drawer[hidden] { display: none; }
.drawer__backdrop { position: absolute; inset: 0; background: rgba(15, 23, 42, 0.45); opacity: 0; transition: opacity var(--dur) var(--ease); }
.drawer__panel {
  position: absolute; inset: 0 0 0 auto;
  width: min(86vw, 340px); height: 100%;
  background: var(--color-surface); border-left: 1px solid var(--color-border);
  padding: var(--space-5);
  display: flex; flex-direction: column;
  transform: translateX(100%); transition: transform var(--dur) var(--ease);
  overflow-y: auto;
}
.drawer.is-open .drawer__backdrop { opacity: 1; }
.drawer.is-open .drawer__panel { transform: translateX(0); }
.drawer__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-6); }
.drawer__close { width: 40px; height: 40px; border-radius: var(--radius); font-size: 1.1rem; color: var(--color-text-muted); }
.drawer__close:hover { background: var(--color-bg-subtle); color: var(--color-text); }
.drawer__list { display: flex; flex-direction: column; gap: var(--space-1); flex: 1; }
.drawer__link { display: block; padding: var(--space-3); border-radius: var(--radius); font-size: var(--fs-md); font-weight: var(--fw-medium); color: var(--color-text); }
.drawer__link:hover, .drawer__link.is-active { background: var(--color-bg-subtle); color: var(--color-primary); }
.drawer__sub { padding-left: var(--space-4); margin-block: var(--space-1); border-left: 2px solid var(--color-border); }
.drawer__sub a { display: block; padding: var(--space-2) var(--space-3); font-size: var(--fs-sm); color: var(--color-text-muted); }
.drawer__sub a:hover { color: var(--color-text); }
.drawer__foot { margin-top: var(--space-6); }

/* -------- Cards -------- */
.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-xs); }

.feature-card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.feature-card:hover { border-color: var(--color-border-strong); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.feature-card__index { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--color-primary); letter-spacing: var(--tracking-wide); }
.feature-card__title { margin-block: var(--space-3) var(--space-2); font-size: var(--fs-lg); }
.feature-card__body { font-size: var(--fs-sm); color: var(--color-text-muted); line-height: var(--lh-body); }

/* -------- FAQ (details/summary — works with zero JS) -------- */
.faq { border-top: 1px solid var(--color-border); }
.faq__item { border-bottom: 1px solid var(--color-border); }
.faq__q {
  list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  padding: var(--space-5) 0;
  font-family: var(--font-display); font-weight: var(--fw-semi); font-size: var(--fs-md);
  cursor: pointer;
}
.faq__q::-webkit-details-marker { display: none; }
.faq__q::after { content: "+"; font-size: 1.4em; color: var(--color-primary); transition: transform var(--dur) var(--ease); }
.faq__item[open] .faq__q::after { transform: rotate(45deg); }
.faq__a { padding-bottom: var(--space-5); }
.faq__a p { color: var(--color-text-muted); max-width: 60ch; }

/* -------- Forms -------- */
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field__label { font-size: var(--fs-sm); font-weight: var(--fw-medium); }
.field__hint { font-size: var(--fs-xs); color: var(--color-text-subtle); }
.input {
  width: 100%; height: 46px; padding: 0 var(--space-4);
  background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-border-strong); border-radius: var(--radius);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.input::placeholder { color: var(--color-text-subtle); }
.input:focus-visible { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-ring); }
.textarea { height: auto; padding: var(--space-3) var(--space-4); resize: vertical; min-height: 120px; line-height: var(--lh-body); }

.contact-info h2 { margin-bottom: var(--space-4); }
.contact-info p { margin-bottom: var(--space-2); }
.contact-info a { color: var(--color-primary); }
.contact-info a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* -------- Badge -------- */
.badge {
  display: inline-flex; align-items: center; gap: var(--space-1);
  height: 22px; padding-inline: var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs); font-weight: var(--fw-semi);
  background: var(--color-primary-soft); color: var(--color-primary);
}

/* ============================ Progress bar ============================ */
/* Determinate progress. Tune per-instance via custom properties:
     --progress-value  (0–100)      the fill percentage
     --progress-radius (length)     corner roundness (default: pill)
     --progress-height (length)     track thickness
   Rounded by default; set .progress--square (or --progress-radius:0) for sharp
   corners. The fill inherits the radius so its leading edge stays rounded. */
.progress {
  --progress-value: 0;
  --progress-radius: var(--radius-full);
  --progress-height: 12px;
  position: relative;
  width: 100%;
  height: var(--progress-height);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--progress-radius);
  overflow: hidden;
}
.progress__bar {
  height: 100%;
  width: calc(var(--progress-value, 0) * 1%);
  background: linear-gradient(90deg,
    var(--color-primary),
    color-mix(in srgb, var(--color-primary) 65%, #8aa4ff));
  border-radius: inherit;
  transition: width 0.25s ease;
}
.progress--sm     { --progress-height: 8px; }
.progress--lg     { --progress-height: 20px; }
.progress--square { --progress-radius: 0; }
.progress--pill   { --progress-radius: var(--radius-full); }

/* ======================= Nav responsive switch ======================= */
/* Desktop ≥ 1024px: horizontal menu, hide hamburger */
@media (min-width: 1024px) {
  .nav-primary { display: block; }
  .nav-cta { display: inline-flex; }
  .hamburger { display: none; }
  .lang-switch__current { display: inline; }
}