/* =========================================================
   COMPONENTS — navbar, footer, buttons, forms, grid
   No Bootstrap. Pure CSS, ~140 lines vs Bootstrap's ~150KB.
   ========================================================= */

/* ---------- NAVBAR (N-01) ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  box-shadow: 0 0 0 rgba(26, 23, 20, 0);
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.site-nav[data-scrolled="true"] {
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  border-bottom-color: var(--border);
  box-shadow: 0 8px 24px -16px rgba(26, 23, 20, 0.18);
}
/* On home, the nav sits over a paper area — make it weightless at the very top */
body.is-home .site-nav:not([data-scrolled="true"]) {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-height);
  gap: var(--space-5);
}
.brand {
  font-family: var(--font-serif);
  font-size: var(--type-md);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
  line-height: 1;
}
.brand small {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.625rem;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: 4px;
}

/* H-02 wordmark */
.wordmark { display: block; color: var(--text); }
.wordmark--compact { height: 36px; width: auto; }
.wordmark--stack   { height: 76px; width: auto; }
@media (max-width: 480px) {
  .wordmark--compact { height: 32px; }
}
.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav__link {
  font-family: var(--font-sans);
  font-size: var(--type-xs);
  font-weight: 400;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-out);
}
.site-nav__link:hover { color: var(--text); }
.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.theme-toggle:hover {
  background: var(--surface-2);
  border-color: var(--stone);
}
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun  { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* Mobile menu */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0;
  position: relative;
  color: var(--text);
}
.nav-toggle::before, .nav-toggle::after,
.nav-toggle span {
  content: "";
  position: absolute;
  left: 8px; right: 8px;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast);
}
.nav-toggle::before { top: 13px; }
.nav-toggle span    { top: 19px; }
.nav-toggle::after  { top: 25px; }
.nav-toggle[aria-expanded="true"]::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span    { opacity: 0; }
.nav-toggle[aria-expanded="true"]::after  { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .site-nav__links {
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--surface);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: var(--space-9) var(--gutter) var(--space-7);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--dur-base) var(--ease-out),
                opacity var(--dur-base) var(--ease-out),
                visibility 0s linear var(--dur-base);
  }
  .site-nav__links[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
  }
  .site-nav__links > li {
    border-bottom: 1px solid var(--border);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 480ms var(--ease-out),
                transform 480ms var(--ease-out);
  }
  .site-nav__links[data-open="true"] > li {
    opacity: 1;
    transform: translateY(0);
  }
  .site-nav__links[data-open="true"] > li:nth-child(1) { transition-delay: 80ms; }
  .site-nav__links[data-open="true"] > li:nth-child(2) { transition-delay: 160ms; }
  .site-nav__links[data-open="true"] > li:nth-child(3) { transition-delay: 240ms; }
  .site-nav__links[data-open="true"] > li:nth-child(4) { transition-delay: 360ms; }
  .site-nav__link {
    display: block;
    padding: var(--space-5) 0;
    font-size: clamp(1.75rem, 7vw, 2.6rem);
    font-family: var(--font-serif);
    letter-spacing: var(--tracking-normal);
    text-transform: none;
    color: var(--text);
  }
  .site-nav__link::after { display: none; }
  /* Mobile: push theme toggle to the bottom */
  .site-nav__links > li:last-child {
    margin-top: auto;
    border-bottom: 0;
    padding-top: var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
  }
  .site-nav__links > li:last-child::before {
    content: "Apparence";
    font-family: var(--font-sans);
    font-size: var(--type-xs);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--text-faint);
  }
  @media (prefers-reduced-motion: reduce) {
    .site-nav__links > li { opacity: 1; transform: none; transition: none; }
  }
}

/* ---------- FOOTER (N-02) ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-9) var(--space-6);
  margin-top: var(--space-10);
  background: var(--surface-2);
  color: var(--text-muted);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  align-items: start;
}
@media (min-width: 720px) {
  .site-footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: var(--space-9);
  }
}
.site-footer__brand {
  color: var(--text);
  display: grid;
  gap: var(--space-3);
}
.site-footer__brand .wordmark {
  margin-bottom: var(--space-2);
}
.site-footer__tagline {
  font-size: var(--type-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--text-faint);
  text-transform: uppercase;
}
.site-footer__heading {
  font-family: var(--font-sans);
  font-size: var(--type-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 var(--space-4);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}
.site-footer__heading::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
  display: inline-block;
}
.site-footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-3);
}
.site-footer__list a {
  font-family: var(--font-serif);
  font-size: var(--type-md);
  font-style: italic;
  color: var(--text);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
.site-footer__list a:hover { color: var(--accent); }
.site-footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--type-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--text-faint);
  text-transform: uppercase;
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--type-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--surface);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
  color: var(--surface);
}
.btn:active { transform: translateY(0); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.btn--ghost {
  background: transparent;
  color: var(--text);
}
.btn--ghost:hover { background: var(--text); color: var(--surface); }

.btn--accent {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
}

.btn--link {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  font-size: var(--type-xs);
  border-radius: 0;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}
.btn--link:hover { color: var(--accent); transform: none; box-shadow: none; }

/* ---------- FORMS ---------- */
.field { display: grid; gap: var(--space-2); margin-bottom: var(--space-5); }
.field__label {
  font-family: var(--font-sans);
  font-size: var(--type-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
}
.field__label .req { color: var(--accent); margin-left: 2px; }

.input, .select, .textarea {
  width: 100%;
  padding: var(--space-3) 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--type-sm);
  line-height: var(--leading-snug);
  transition: border-color var(--dur-fast) var(--ease-out);
}
.input::placeholder, .textarea::placeholder { color: var(--text-faint); }
.input:hover, .select:hover, .textarea:hover { border-bottom-color: var(--stone); }
.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-bottom-color: var(--accent);
}
.textarea { resize: vertical; min-height: 7rem; padding: var(--space-3) 0; }
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--text) 50%), linear-gradient(135deg, var(--text) 50%, transparent 50%); background-position: calc(100% - 14px) center, calc(100% - 8px) center; background-size: 6px 6px, 6px 6px; background-repeat: no-repeat; padding-right: var(--space-7); }

.field--invalid .input,
.field--invalid .select,
.field--invalid .textarea { border-bottom-color: var(--accent); }
.field__error {
  font-size: var(--type-xs);
  color: var(--accent);
  display: none;
}
.field--invalid .field__error { display: block; }

.field-row {
  display: grid;
  gap: var(--space-5);
}
@media (min-width: 640px) {
  .field-row--2 { grid-template-columns: 1fr 1fr; }
}

.checkbox {
  display: inline-flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--type-sm);
  color: var(--text-muted);
  cursor: pointer;
}
.checkbox input {
  appearance: none;
  width: 18px; height: 18px;
  border: 1px solid var(--border);
  border-radius: 2px;
  margin: 0;
  flex-shrink: 0;
  position: relative;
  cursor: pointer;
  background: var(--surface);
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.checkbox input:hover { border-color: var(--stone); }
.checkbox input:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.checkbox input:checked::after {
  content: "";
  position: absolute;
  inset: 3px;
  background: var(--paper);
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0, 43% 62%);
}

/* ---------- ALERTS / NOTICES ---------- */
.alert {
  display: none;
  padding: var(--space-4) var(--space-5);
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
  font-size: var(--type-sm);
  color: var(--text);
  margin-bottom: var(--space-5);
}
.alert[data-show="true"] { display: block; }
.alert--success {
  border-left-color: #4a7c4e;
  background: rgba(74, 124, 78, 0.08);
}
[data-theme="dark"] .alert--success {
  border-left-color: #9CC79F;
  background: rgba(156, 199, 159, 0.10);
}

/* ---------- ICONS ---------- */
.icon {
  width: 1em;
  height: 1em;
  display: inline-block;
  vertical-align: -0.125em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon--lg { width: 1.5em; height: 1.5em; }