/* =========================================================
   Components
   header · nav · theme toggle · footer · back-to-top
   button · chip · card · avatar · tabs · code · steps · forms
   ========================================================= */

/* ---------- Icons ---------- */
.icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  flex: none;
  vertical-align: middle;
}

/* ---------- Header: floating bar ---------- */
.site-header {
  position: fixed;
  z-index: 50;
  inset: var(--header-gap) 0 auto;
  pointer-events: none; /* only the bar takes clicks, not the gutters beside it */
}
.site-header__inner {
  position: relative;
  display: flex;
  height: var(--header-h);
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-inline: var(--space-4) var(--space-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  box-shadow: var(--shadow-sm);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  pointer-events: auto;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-header.is-scrolled .site-header__inner {
  border-color: color-mix(in srgb, var(--border-strong) 45%, var(--border));
  background: color-mix(in srgb, var(--surface) 96%, transparent);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--tap);
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.brand__mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
}
.brand__word {
  font-weight: 700;
  font-size: var(--fs-md);
  letter-spacing: .02em;
}
.brand__word b { color: var(--accent-fg); font-weight: inherit; }

/* ---------- Main nav ---------- */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}
.main-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}
.main-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.main-nav__link:hover { color: var(--text); background: var(--surface-2); }
/* Active page: accent text with a small dot underneath */
.main-nav__link { position: relative; }
.main-nav__link[aria-current="page"] {
  color: var(--accent-fg);
  font-weight: 600;
}
.main-nav__link[aria-current="page"]:hover { background: transparent; }
.main-nav__link[aria-current="page"]::after {
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 5px;
  height: 5px;
  content: "";
  border-radius: var(--radius-full);
  background: currentColor;
  transform: translateX(-50%);
}
.main-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.menu-button {
  display: none;
  width: var(--tap);
  height: var(--tap);
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  transition: background-color var(--dur-fast) var(--ease);
}
.menu-button:hover { background: var(--surface-2); }
.menu-button__close,
.menu-button[aria-expanded="true"] .menu-button__open { display: none; }
.menu-button[aria-expanded="true"] .menu-button__close { display: block; }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-grid;
  width: var(--tap);
  height: var(--tap);
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  transition: background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.theme-toggle:hover { background: var(--surface-2); border-color: var(--border-strong); }
.theme-toggle__sun { display: none; }
[data-theme="dark"] .theme-toggle__sun { display: block; }
[data-theme="dark"] .theme-toggle__moon { display: none; }

/* ---------- Mobile menu (< 960px) ---------- */
@media (max-width: 959.98px) {
  .menu-button { display: inline-grid; }
  .main-nav {
    position: absolute;
    top: calc(100% + var(--space-2));
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    max-height: calc(100dvh - var(--header-h) - 2 * var(--header-gap) - var(--space-4));
    margin: 0;
    padding: var(--space-4);
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-md);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s linear var(--dur);
  }
  .main-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition-delay: 0s;
  }
  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .main-nav__link {
    display: flex;
    justify-content: center;
    min-height: 52px;
    font-size: var(--fs-md);
  }
  .main-nav__actions {
    justify-content: center;
    padding-top: var(--space-4);
    border-top: 1px solid var(--border);
  }
  .main-nav__actions .btn {
    flex: 1 1 auto;
    max-width: 280px;
  }

  /* Links slide in one after another, 30ms apart */
  .main-nav.is-open .main-nav__list > li,
  .main-nav.is-open .main-nav__actions { animation: nav-item-in var(--dur) var(--ease) both; }
  .main-nav.is-open .main-nav__list > li:nth-child(2) { animation-delay: 30ms; }
  .main-nav.is-open .main-nav__list > li:nth-child(3) { animation-delay: 60ms; }
  .main-nav.is-open .main-nav__list > li:nth-child(4) { animation-delay: 90ms; }
  .main-nav.is-open .main-nav__list > li:nth-child(5) { animation-delay: 120ms; }
  .main-nav.is-open .main-nav__list > li:nth-child(6) { animation-delay: 150ms; }
  .main-nav.is-open .main-nav__actions { animation-delay: 180ms; }
}
@keyframes nav-item-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: var(--fs-sm);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 2fr) auto;
  grid-template-areas:
    "about nav social"
    "copy copy copy";
  gap: var(--space-5) var(--space-6);
  align-items: start;
  padding-block: var(--space-7) var(--space-5);
}
.site-footer__about {
  grid-area: about;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}
.site-footer__desc { max-width: 36ch; }
.site-footer__nav { grid-area: nav; }
.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-footer__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  color: var(--text-muted);
  text-decoration: none;
}
.site-footer__link:hover { color: var(--text); text-decoration: underline; }
.site-footer__bottom {
  grid-area: copy;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
}
.site-footer__copy { max-width: none; }

/* Developer credit: small pill with the studio's mark */
.credit {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap);
  padding: 0 var(--space-4) 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface-2);
  color: var(--text-muted);
  text-decoration: none;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.credit:hover { border-color: var(--border-strong); color: var(--text); }
.credit__logo {
  width: 20px;
  height: 20px;
  flex: none;
}
.credit__name {
  color: var(--text);
  font-weight: 600;
}

.footer-socials {
  grid-area: social;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
/* Round icon-only link/button (footer socials, member socials) */
.icon-btn {
  display: inline-grid;
  width: var(--tap);
  height: var(--tap);
  flex: none;
  place-items: center;
  border-radius: var(--radius-full);
  background: var(--surface-2);
  color: var(--text-muted);
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.icon-btn:hover { background: var(--border); color: var(--text); }
.icon-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (max-width: 768px) {
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "about" "nav" "social" "copy";
    justify-items: center;
    text-align: center;
  }
  .site-footer__about { align-items: center; }
  .site-footer__links,
  .footer-socials { justify-content: center; }
  .site-footer__bottom {
    width: 100%;
    flex-direction: column;
  }
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  z-index: 40;
  bottom: var(--space-5);
  inset-inline-end: var(--space-5);
  display: inline-grid;
  width: var(--tap);
  height: var(--tap);
  place-items: center;
  border: 0;
  border-radius: var(--radius-full);
  background: var(--accent);
  color: var(--accent-text);
  box-shadow: var(--shadow-md);
  visibility: hidden;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s linear var(--dur), background-color var(--dur-fast) var(--ease);
}
.back-to-top.is-visible {
  visibility: visible;
  opacity: 1;
  transform: none;
  transition-delay: 0s;
}
.back-to-top:hover,
.back-to-top:active { background: var(--accent-hover); }
html.menu-open .back-to-top { visibility: hidden; opacity: 0; }
@media (max-width: 640px) {
  .back-to-top {
    bottom: var(--space-4);
    inset-inline-end: var(--space-4);
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap);
  padding: 0 var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text);
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.btn--primary {
  background: var(--accent);
  color: var(--accent-text);
}
.btn--primary:hover,
.btn--primary:active { background: var(--accent-hover); }

.btn--secondary {
  border-color: var(--border-strong);
  background: var(--surface);
  color: var(--text);
}
.btn--secondary:hover { background: var(--surface-2); }
.btn--secondary:active { border-color: var(--text-muted); }

.btn--ghost { color: var(--text); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--ghost:active { background: var(--border); }

.btn--sm {
  padding: 0 var(--space-4);
  font-size: var(--fs-sm);
}
.btn--block { width: 100%; }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: .6;
  cursor: not-allowed;
}
.btn svg { width: 18px; height: 18px; flex: none; }
@media (max-width: 640px) {
  .btn { white-space: normal; padding-block: var(--space-2); }
}

/* ---------- Chips ---------- */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0;
  list-style: none;
}
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-full);
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
}
.chip--accent { background: var(--accent-soft); color: var(--accent-fg); }
.chip--sev-critical { background: var(--sev-critical-bg); color: var(--sev-critical-fg); }
.chip--sev-high { background: var(--sev-high-bg); color: var(--sev-high-fg); }
.chip--sev-medium { background: var(--sev-medium-bg); color: var(--sev-medium-fg); }
.chip--sev-low { background: var(--sev-low-bg); color: var(--sev-low-fg); }

button.chip {
  min-height: var(--tap);
  border: 1px solid transparent;
}
button.chip:hover { color: var(--text); }
button.chip[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); }

/* ---------- Card ---------- */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 0;
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.card:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.card--interactive {
  text-decoration: none;
  cursor: pointer;
}
.card--interactive:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.card--static:hover { border-color: var(--border); }

.card__index {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
}
.card__title { font-size: var(--fs-lg); }
.card__body { color: var(--text-muted); }
.card__body strong { color: var(--text); }
.card__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: auto;
  padding-top: var(--space-2);
}
.card__footer--divided {
  align-self: stretch;
  justify-content: flex-start;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}
.card__arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent-fg);
  font-size: var(--fs-sm);
  font-weight: 600;
}
.card__role {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
}
.card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding-left: var(--space-5);
  color: var(--text-muted);
}
.card__list li::marker { color: var(--accent-fg); }
.card__list strong { color: var(--text); }

/* Call-to-action card: text on the left, action on the right */
.card--cta {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.card--cta .stack { flex: 1 1 420px; }

/* Member card */
.card--member { align-items: flex-start; }
.card--member .card__body {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  overflow: hidden;
}

/* Research / logo card */
.card__logo {
  display: flex;
  height: 72px;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--logo-plate);
}
.card__logo--dark { background: var(--logo-plate-dark); }
.card__logo img {
  max-width: 70%;
  max-height: 40px;
  object-fit: contain;
}
.card__wordmark {
  color: var(--text);
  font-size: var(--fs-md);
  font-weight: 700;
}
.card__logo .card__wordmark { color: var(--logo-ink); }

/* CVE id */
.card__code {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 600;
}

@media (max-width: 640px) {
  .card { padding: var(--space-4); }
}

/* ---------- Avatar ---------- */
.avatar {
  display: grid;
  width: 112px;
  height: 112px;
  flex: none;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface-2);
}
.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.avatar__initials {
  color: var(--text-muted);
  font-size: var(--fs-xl);
  font-weight: 700;
}

/* ---------- Tabs ---------- */
.tabs__list {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
}
.tab {
  min-height: var(--tap);
  padding: 0 var(--space-4);
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--text-muted);
  font-size: var(--fs-sm);
  font-weight: 600;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] {
  border-bottom-color: var(--accent);
  color: var(--text);
}
.tabs__panel { padding-top: var(--space-5); }

/* ---------- Code block ---------- */
.code-block {
  margin: 0;
  padding: var(--space-4);
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--code-bg);
  color: var(--code-text);
  font-size: var(--fs-code);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.card__body code {
  padding: 1px var(--space-1);
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--text);
  font-size: .9em;
}

/* ---------- Numbered steps ---------- */
.steps {
  display: flex;
  flex-direction: column;
  padding: 0;
  list-style: none;
}
.steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-top: 1px solid var(--border);
}
.steps__item:first-child { border-top: 0; padding-top: 0; }
.steps__num {
  color: var(--accent-fg);
  font-family: var(--font-mono);
  font-weight: 600;
}
.steps__title {
  display: block;
  color: var(--text);
  font-weight: 600;
}
.steps__text {
  display: block;
  color: var(--text-muted);
}

/* ---------- Forms ---------- */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}
@media (max-width: 640px) {
  .form__row { grid-template-columns: minmax(0, 1fr); }
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}
.field__label {
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 600;
}
.field__input {
  width: 100%;
  min-height: var(--tap);
  padding: 10px var(--space-3);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: var(--fs-base);
  line-height: 1.4;
  transition: border-color var(--dur-fast) var(--ease);
}
.field__input::placeholder { color: var(--text-muted); opacity: .8; }
.field__input:hover { border-color: var(--text-muted); }
.field__input:focus-visible {
  border-color: var(--focus);
  outline-offset: 0;
}
textarea.field__input {
  min-height: 120px;
  resize: vertical;
}
.field__input[aria-invalid="true"] { border-color: var(--danger); }
.field__error {
  color: var(--danger);
  font-size: var(--fs-sm);
}
.field__hint {
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  color: var(--text-muted);
  font-size: var(--fs-sm);
}
.checkbox input {
  width: 20px;
  height: 20px;
  margin: 2px 0 0;
  flex: none;
  accent-color: var(--accent);
}

.dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-5);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  text-align: center;
  transition: border-color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.dropzone:hover,
.dropzone.is-dragover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone:focus-within {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}
.dropzone__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}
.dropzone__label { color: var(--text); font-weight: 600; }
.dropzone__hint { color: var(--text-muted); font-size: var(--fs-sm); }
.dropzone__file {
  margin-top: var(--space-2);
  max-width: 100%;
  overflow-wrap: anywhere;
}

.form__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
}
.form__note { color: var(--text-muted); font-size: var(--fs-sm); }

.form-status {
  min-height: 1.6em;
  color: var(--text-muted);
  font-size: var(--fs-sm);
}
.form-status:empty { min-height: 0; }
.form-status--ok { color: var(--success); }
.form-status--error { color: var(--danger); }

/* ---------- Logo strip (home trust row) ---------- */
.logo-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 120px), 1fr));
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}
.logo-strip__item {
  display: flex;
  height: 64px;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--logo-plate);
}
.logo-strip__item img {
  max-width: 100%;
  max-height: 32px;
  object-fit: contain;
  filter: grayscale(1) contrast(1.2);
  transition: filter var(--dur) var(--ease);
}
.logo-strip__item:hover img { filter: none; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  z-index: 60;
  bottom: var(--space-5);
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface);
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 600;
  box-shadow: var(--shadow-md);
  visibility: hidden;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s linear var(--dur);
}
.toast.is-visible {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, 0);
  transition-delay: 0s;
}
.toast .icon { color: var(--success); }