/* ============================================================
   PENTA v2 — SHARED COMPONENTS
   Header / navigation / toggles keep the class names that
   navigation.js and theme.js query (.header, .header--scrolled,
   .nav__link, .nav-mobile, .nav-mobile--open, .hamburger,
   .hamburger--active, .toggle__btn--active, [data-*-toggle]).
   ============================================================ */

/* ------------------------------------------------------------
   HEADER
   ------------------------------------------------------------ */

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: var(--header-h);
  background: color-mix(in srgb, var(--paper) 0%, transparent);
  border-bottom: var(--rule-w) solid transparent;
  transition:
    background-color var(--dur-base) var(--ease-in-out),
    border-color var(--dur-base) var(--ease-in-out);
}

.header--scrolled {
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  border-bottom-color: var(--rule);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 100%;
}

.header__logo {
  display: inline-flex;
  align-items: center;
  height: 100%;
}

/* Brand wordmark — the logo's structure (bar · Penta · organizasyon)
   set in the system's own type, crisp at any size and in both themes */
.brand {
  display: inline-flex;
  align-items: stretch;
  gap: 0.6rem;
  color: var(--ink);
}

.brand__bar {
  width: 2px;
  background: var(--wine);
}

.brand__type {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.625rem;
  font-variation-settings: 'opsz' 48;
  letter-spacing: -0.01em;
  color: var(--wine);
}

.brand__sub {
  margin-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.brand--footer .brand__name {
  font-size: 1.375rem;
}


/* Desktop nav */
.nav {
  display: none;
}

.nav__list {
  display: flex;
  gap: clamp(1.25rem, 2.2vw, 2.5rem);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding-block: 0.35rem;
  font-size: var(--fs-small);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-base) var(--ease-out);
}

.nav__link:hover,
.nav__link--active {
  color: var(--ink);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav__link--active::after {
  background: var(--wine);
}

/* Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.5vw, 1.5rem);
}

.toggle {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--ls-mono);
}

.toggle__sep {
  color: var(--ink-3);
}

.toggle__btn {
  padding: 0.25rem 0;
  color: var(--ink-3);
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}

.toggle__btn:hover {
  color: var(--ink);
}

.toggle__btn--active {
  color: var(--ink);
  border-bottom-color: var(--wine);
}

.toggle-theme {
  position: relative;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: var(--rule-w) solid var(--rule);
  border-radius: 50%;
  color: var(--ink-2);
  transition: border-color var(--dur-fast), color var(--dur-fast);
}

.toggle-theme:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.toggle-theme svg {
  position: absolute;
  width: 16px;
  height: 16px;
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}

[data-theme="light"] .toggle-theme .icon-sun,
[data-theme="dark"] .toggle-theme .icon-moon {
  opacity: 0;
  transform: rotate(-60deg) scale(0.6);
}

[data-theme="light"] .toggle-theme .icon-moon,
[data-theme="dark"] .toggle-theme .icon-sun {
  opacity: 1;
  transform: none;
}

/* Hamburger */
.hamburger {
  position: relative;
  z-index: calc(var(--z-header) + 1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 36px;
  height: 36px;
  padding: 0 6px;
}

.hamburger__line {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast);
}

.hamburger__line:nth-child(2) {
  width: 70%;
}

.hamburger--active .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger--active .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger--active .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav — full-height paper panel */
.nav-mobile {
  position: fixed;
  inset: 0;
  z-index: var(--z-nav-mobile);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: calc(var(--header-h) + 1rem) var(--gutter) clamp(2rem, 8vh, 5rem);
  background: var(--paper);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}

.nav-mobile--open {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur-base) var(--ease-out), visibility 0s;
}

.nav-mobile__list {
  display: grid;
  border-top: var(--rule-w) solid var(--rule);
}

.nav-mobile__list li {
  border-bottom: var(--rule-w) solid var(--rule);
  overflow: hidden;
}

.nav-mobile__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 1rem 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 7vw, 2.75rem);
  line-height: 1.05;
  color: var(--ink);
  transform: translateY(110%);
  transition: transform var(--dur-slow) var(--ease-out), color var(--dur-fast);
}

.nav-mobile__link--active {
  color: var(--wine);
  font-style: italic;
}

.nav-mobile--open .nav-mobile__link {
  transform: none;
}

.nav-mobile--open li:nth-child(1) .nav-mobile__link { transition-delay: 60ms; }
.nav-mobile--open li:nth-child(2) .nav-mobile__link { transition-delay: 110ms; }
.nav-mobile--open li:nth-child(3) .nav-mobile__link { transition-delay: 160ms; }
.nav-mobile--open li:nth-child(4) .nav-mobile__link { transition-delay: 210ms; }
.nav-mobile--open li:nth-child(5) .nav-mobile__link { transition-delay: 260ms; }
.nav-mobile--open li:nth-child(6) .nav-mobile__link { transition-delay: 310ms; }

.nav-mobile__foot {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
}

@media (min-width: 1024px) {
  .nav {
    display: block;
  }

  .hamburger,
  .nav-mobile {
    display: none;
  }
}

/* ------------------------------------------------------------
   BUTTONS & LINKS
   ------------------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 3.25rem;
  padding: 0 1.75rem;
  font-size: var(--fs-small);
  font-weight: 500;
  letter-spacing: 0.02em;
  border: var(--rule-w) solid var(--ink);
  border-radius: var(--radius);
  transition:
    background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
}

.btn--solid {
  background: var(--ink);
  color: var(--paper);
}

.btn--solid:hover {
  background: var(--wine);
  border-color: var(--wine);
}

.btn--outline {
  background: transparent;
  color: var(--ink);
}

.btn--outline:hover {
  background: var(--ink);
  color: var(--paper);
}

/* model-viewer reset shared by every 3D instance */
.model {
  width: 100%;
  height: 100%;
  background: transparent;
  --poster-color: transparent;
  --progress-bar-color: transparent;
}

/* Text link with a rule that extends on hover */
.link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding-bottom: 0.25rem;
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
}

.link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--rule-strong);
  transition: background-color var(--dur-fast);
}

.link:hover::after {
  background: var(--wine);
}

.link__arrow {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-out);
}

.link:hover .link__arrow {
  transform: translateX(4px);
}

/* ------------------------------------------------------------
   FOOTER — two rows: brand line, link line; then the legal line
   ------------------------------------------------------------ */

.footer {
  margin-top: var(--section);
  border-top: var(--rule-w) solid var(--rule);
  padding-block: var(--block) 1.5rem;
}

.footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.footer__tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--ink-2);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  margin-top: var(--block);
  font-size: var(--fs-small);
}

.footer__nav a {
  color: var(--ink-2);
  transition: color var(--dur-fast);
}

.footer__nav a:hover {
  color: var(--wine);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  margin-top: var(--block);
  padding-top: 1.25rem;
  border-top: var(--rule-w) solid var(--rule);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.footer__legal {
  display: flex;
  gap: 1.5rem;
}

.footer__legal a:hover {
  color: var(--ink);
}

/* ------------------------------------------------------------
   BACK TO TOP — main.js toggles .back-to-top--visible
   ------------------------------------------------------------ */

.back-to-top {
  position: fixed;
  right: clamp(1rem, 2.5vw, 2rem);
  bottom: clamp(1rem, 2.5vw, 2rem);
  z-index: var(--z-fab);
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--paper);
  border: var(--rule-w) solid var(--rule-strong);
  color: var(--ink);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}

.back-to-top--visible {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

.back-to-top:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* ------------------------------------------------------------
   PAGE HEAD — inner-page opening (eyebrow · title · lead)
   ------------------------------------------------------------ */

.page-head {
  padding-top: calc(var(--header-h) + clamp(2.5rem, 6vh, 5rem));
  padding-bottom: var(--block);
  border-bottom: var(--rule-w) solid var(--rule);
}

.page-head__inner {
  display: grid;
  gap: 1.25rem;
}

.page-head__title {
  max-width: 14ch;
  animation: rise var(--dur-slow) var(--ease-out) 80ms both;
}

.page-head__lead {
  animation: rise var(--dur-slow) var(--ease-out) 240ms both;
}

@media (min-width: 1024px) {
  .page-head__inner {
    grid-template-columns: 7fr 5fr;
    column-gap: 3rem;
    align-items: end;
  }

  .page-head__lead {
    padding-bottom: 0.5rem;
  }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------
   PROSE — long-form copy
   ------------------------------------------------------------ */

.prose {
  display: grid;
  gap: 1.25rem;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink-2);
  text-wrap: pretty;
}

.prose strong {
  font-weight: 500;
  color: var(--ink);
}

.prose--lg {
  font-size: var(--fs-lead);
  line-height: 1.5;
}

/* ------------------------------------------------------------
   ROWS — numbered (or timed) editorial list. .rows--plain: no visual.
   .row__num left empty is filled by the CSS counter; text (e.g. a time)
   overrides it.
   ------------------------------------------------------------ */

.rows {
  counter-reset: row;
  border-bottom: var(--rule-w) solid var(--rule);
}

.row {
  position: relative;
  counter-increment: row;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num  visual"
    "body visual";
  column-gap: 1.25rem;
  row-gap: 0.5rem;
  padding-block: 1.75rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.rows--plain .row {
  grid-template-areas:
    "num"
    "body";
  grid-template-columns: 1fr;
}

.row__num {
  grid-area: num;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--brass);
  font-variant-numeric: tabular-nums;
}

.row__num:empty::before {
  content: counter(row, decimal-leading-zero);
}

.row__body {
  grid-area: body;
  display: grid;
  align-content: start;
  gap: 0.75rem;
  justify-items: start;
}

.row__title {
  transition: color var(--dur-fast) var(--ease-out);
}

.row__title a {
  color: inherit;
}

.row__text {
  max-width: 52ch;
  color: var(--ink-2);
  text-wrap: pretty;
}

.row__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.row__list li::before {
  content: '—';
  margin-right: 0.5rem;
  color: var(--brass);
}

.row__visual {
  grid-area: visual;
  width: clamp(88px, 22vw, 150px);
  aspect-ratio: 1;
  justify-self: end;
  align-self: start;
}

.row:hover .row__title {
  color: var(--wine);
}

.row:hover .row__visual .model {
  transform: scale(1.06);
}

.row__visual .model {
  transition: transform var(--dur-slow) var(--ease-out);
}

@media (min-width: 768px) {
  .row {
    grid-template-columns: 6.5rem 1fr 180px;
    grid-template-areas: "num body visual";
    column-gap: 2rem;
    padding-block: 2.25rem;
  }

  .rows--plain .row {
    grid-template-columns: 6.5rem 1fr;
    grid-template-areas: "num body";
  }

  .row__num {
    padding-top: 0.55rem;
  }

  .row__visual {
    width: 180px;
  }
}

@media (min-width: 1024px) {
  .row {
    grid-template-columns: 8rem minmax(0, 1fr) 220px;
    column-gap: 3rem;
    padding-block: 2.75rem;
  }

  .rows--plain .row {
    grid-template-columns: 8rem minmax(0, 1fr);
  }

  .row__visual {
    width: 220px;
  }
}

/* ------------------------------------------------------------
   DL — mono term / value pairs
   ------------------------------------------------------------ */

.dl {
  border-top: var(--rule-w) solid var(--rule);
}

.dl__row {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1rem;
  padding-block: 1rem;
  border-bottom: var(--rule-w) solid var(--rule);
}

.dl__term {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--ls-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 0.2rem;
}

.dl__value {
  color: var(--ink);
  font-style: normal;
  line-height: 1.5;
}

.dl__value a:hover {
  color: var(--wine);
}

/* ------------------------------------------------------------
   FORM — hairline fields. Class names are the forms.js contract:
   [data-form], .form__group, .form__field--error/--success,
   .form__message, .form__status(--success/--error),
   .file-upload__*, .form__char-counter, .btn__text, .is-loading
   ------------------------------------------------------------ */

.form {
  display: grid;
  gap: 1.75rem;
}

.form__row {
  display: grid;
  gap: 1.75rem;
}

@media (min-width: 640px) {
  .form__row {
    grid-template-columns: 1fr 1fr;
  }
}

.form__group {
  position: relative;
  display: grid;
  gap: 0.5rem;
}

.form__label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--ls-mono);
  text-transform: uppercase;
  color: var(--ink-2);
}

.form__label svg {
  display: none;
}

.form__input,
.form__select,
.form__textarea {
  width: 100%;
  padding: 0.85rem 0;
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: var(--rule-w) solid var(--rule-strong);
  border-radius: 0;
  transition: border-color var(--dur-fast);
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--ink-3);
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  outline: none;
  border-bottom-color: var(--wine);
}

.form__select {
  appearance: none;
  padding-right: 1.5rem;
  cursor: pointer;
}

.form__group--select::after {
  content: '';
  position: absolute;
  right: 4px;
  bottom: 1.3rem;
  width: 7px;
  height: 7px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  transform: rotate(45deg);
  pointer-events: none;
}

.form__textarea {
  min-height: 8rem;
  resize: vertical;
}

.form__hint {
  font-size: var(--fs-small);
  color: var(--ink-3);
}

.form__field--error .form__input,
.form__field--error .form__select,
.form__field--error .form__textarea {
  border-bottom-color: var(--wine);
}

.form__message {
  font-size: var(--fs-small);
  color: var(--wine);
}

.form__char-counter {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.form__char-counter--warning {
  color: var(--wine);
}

.form__status {
  padding: 1rem 1.25rem;
  border: var(--rule-w) solid var(--rule-strong);
  font-size: var(--fs-small);
  color: var(--ink);
}

.form__status--success {
  border-color: var(--brass);
}

.form__status--error {
  border-color: var(--wine);
  color: var(--wine);
}

/* File upload */
.file-upload {
  position: relative;
}

.file-upload__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-upload__label {
  display: grid;
  gap: 0.35rem;
  padding: 1.5rem;
  border: 1px dashed var(--rule-strong);
  transition: border-color var(--dur-fast);
}

.file-upload__label svg {
  display: none;
}

.file-upload__input:hover + .file-upload__label,
.file-upload__input:focus-visible + .file-upload__label {
  border-color: var(--ink);
}

.file-upload__name {
  font-size: var(--fs-small);
  color: var(--ink);
}

.file-upload__hint {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.file-upload__label--error {
  border-color: var(--wine);
}

.file-upload__label--success {
  border-style: solid;
  border-color: var(--brass);
}

.file-upload__preview {
  margin-top: 0.5rem;
  font-size: var(--fs-small);
}

/* Checkbox */
.checkbox {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: var(--fs-small);
  color: var(--ink-2);
  cursor: pointer;
}

.checkbox input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.checkbox__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 0.2rem;
  border: var(--rule-w) solid var(--rule-strong);
  transition: border-color var(--dur-fast);
}

.checkbox input:checked + .checkbox__mark {
  border-color: var(--ink);
}

.checkbox input:checked + .checkbox__mark::after {
  content: '';
  position: absolute;
  inset: 3px;
  background: var(--ink);
}

.checkbox input:focus-visible + .checkbox__mark {
  outline: 2px solid var(--wine);
  outline-offset: 3px;
}

/* Submit states */
.btn--full {
  width: 100%;
}

.btn__icon,
.btn__loader {
  display: none;
}

.btn.is-loading {
  opacity: 0.6;
  pointer-events: none;
}

/* ------------------------------------------------------------
   ACCORDION — main.js toggles .accordion__item--open
   ------------------------------------------------------------ */

.accordion {
  border-top: var(--rule-w) solid var(--rule);
}

.accordion__item {
  border-bottom: var(--rule-w) solid var(--rule);
}

.accordion__header {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.25rem 0;
  text-align: left;
  font-family: var(--font-display);
  font-size: var(--fs-display-sm);
  line-height: 1.15;
  font-variation-settings: 'opsz' 28;
  color: var(--ink);
  transition: color var(--dur-fast);
}

.accordion__header:hover,
.accordion__item--open .accordion__header {
  color: var(--wine);
}

.accordion__icon {
  flex: none;
  width: 16px;
  height: 16px;
  transition: transform var(--dur-base) var(--ease-out);
}

.accordion__item--open .accordion__icon {
  transform: rotate(180deg);
}

.accordion__content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-base) var(--ease-out);
}

.accordion__item--open .accordion__content {
  grid-template-rows: 1fr;
}

.accordion__content > * {
  overflow: hidden;
}

.accordion__body {
  max-width: 60ch;
  padding-bottom: 1.5rem;
  color: var(--ink-2);
}