/* Components. Mobile-first; breakpoints at 640px, 960px, 1280px. */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap-min);
  padding: var(--space-2) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--fs-base);
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-2);
  color: #fff;
}

.btn--ghost {
  background: var(--color-bg);
  border-color: var(--color-border);
  color: var(--color-primary);
}

.btn--ghost:hover {
  border-color: var(--color-primary-2);
  color: var(--color-primary-2);
}

.btn:active {
  transform: translateY(1px);
}

.btn__arrow {
  transition: transform var(--dur-fast) var(--ease);
}

.btn:hover .btn__arrow {
  transform: translateY(2px);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(1.4) blur(8px);
  -webkit-backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--tap-min);
  margin-right: auto;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--fs-xl);          /* 22px on phones, 24px from 960px (see below) */
  letter-spacing: -0.015em;
  white-space: nowrap;
}

@media (min-width: 960px) {
  .brand { font-size: 1.5rem; }
}

.brand:hover {
  color: var(--color-primary);
}

/* Language toggle: TR | EN — always visible */
.lang-toggle {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
}

.lang-toggle__btn {
  min-width: var(--tap-min);
  min-height: var(--tap-min);
  padding: 0 var(--space-2);
  border: 0;
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.lang-toggle__btn + .lang-toggle__btn {
  border-left: 1px solid var(--color-border);
}

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

.lang-toggle__btn[aria-pressed="true"] {
  background: var(--color-primary);
  color: #fff;
}

/* Hamburger (mobile only) */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-min);
  height: var(--tap-min);
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-primary);
  cursor: pointer;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-fast) var(--ease);
}

.nav-toggle__bars {
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after  { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* Primary navigation — mobile: dropdown panel under the header */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition:
    opacity var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease),
    visibility 0s linear var(--dur-fast);
}

.site-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition:
    opacity var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  padding: var(--space-2) var(--gutter) var(--space-4);
}

.site-nav__link {
  display: flex;
  align-items: center;
  min-height: var(--tap-min);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-grid);
  color: var(--color-text);
  font-weight: 500;
  text-decoration: none;
}

.site-nav__link:hover {
  color: var(--color-primary-2);
}

/* Desktop navigation: inline links, no hamburger */
@media (min-width: 960px) {
  .nav-toggle {
    display: none;
  }

  .site-header__inner {
    gap: var(--space-5);
  }

  .site-nav {
    position: static;
    order: -1;
    margin-left: auto;
    background: none;
    border: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
  }

  /* Brand left, nav pushed right, then the language toggle */
  .brand {
    order: -2;
    margin-right: 0;
  }

  .site-nav__list {
    flex-direction: row;
    gap: var(--space-5);
    padding: 0;
  }

  .site-nav__link {
    position: relative;
    border-bottom: 0;
    padding: 0 var(--space-1);
  }

  .site-nav__link::after {
    content: "";
    position: absolute;
    left: var(--space-1);
    right: var(--space-1);
    bottom: 8px;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--dur-base) var(--ease);
  }

  .site-nav__link:hover::after {
    transform: scaleX(1);
  }
}

/* ---------- Hero ---------- */
.hero {
  padding-block: var(--space-8) var(--space-8);
}

.hero__sheet {
  position: relative;
  padding: var(--space-6) var(--space-5);
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* Drawing-sheet corner marks */
.hero__sheet::before,
.hero__sheet::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-accent);
  pointer-events: none;
}

.hero__sheet::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.hero__sheet::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
}

.hero__eyebrow {
  display: inline-block;
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  /* No text-transform: Turkish uppercasing would turn "SolidWorks" into "SOLİDWORKS" */
  color: var(--color-text-muted);
}

.hero__title {
  max-width: 18ch;
  margin-bottom: var(--space-4);
}

.hero__lead {
  max-width: 56ch;
  margin-bottom: var(--space-6);
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
}

/* Decorative dimension line under the title */
.dimension {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: 320px;
  margin-bottom: var(--space-5);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
}

.dimension__line {
  position: relative;
  flex: 1;
  height: 1px;
  background: currentColor;
}

.dimension__line::before,
.dimension__line::after {
  content: "";
  position: absolute;
  top: -5px;
  width: 1px;
  height: 11px;
  background: currentColor;
}

.dimension__line::before { left: 0; }
.dimension__line::after  { right: 0; }

@media (min-width: 640px) {
  .hero__sheet { padding: var(--space-7) var(--space-7); }
}

@media (min-width: 960px) {
  .hero { padding-block: var(--space-9); }
  .hero__sheet { padding: var(--space-8) var(--space-8); }
}

/* ---------- Section heading ---------- */
.section-head {
  margin-bottom: var(--space-6);
}

.section-head__label {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.section-head__title {
  margin-bottom: 0;
}

.section--surface {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

/* ---------- Placeholder blocks (filled in later phases) ---------- */
.placeholder {
  display: grid;
  place-items: center;
  min-height: 200px;
  padding: var(--space-5);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  text-align: center;
}

/* ---------- Category chips (horizontal scroll on mobile) ---------- */
.chips {
  display: flex;
  gap: var(--space-2);
  margin: calc(var(--space-2) * -1) calc(var(--gutter) * -1) var(--space-5);
  /* Vertical padding keeps the focus outline from being clipped by the scroll box */
  padding: var(--space-2) var(--gutter);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  /* Snap to the gutter, not the viewport edge */
  scroll-padding-inline: var(--gutter);
  /* Thin, palette-matched scrollbar so visitors see the row scrolls */
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
  -webkit-overflow-scrolling: touch;
}

.chips::-webkit-scrollbar {
  height: 6px;
}

.chips::-webkit-scrollbar-track {
  background: transparent;
}

.chips::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.chips::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

.chip {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap-min);
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--fs-sm);
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  scroll-snap-align: start;
  transition:
    background-color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

.chip:hover {
  border-color: var(--color-accent);
}

.chip[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.chip__count {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  opacity: 0.75;
}

@media (min-width: 960px) {
  .chips {
    flex-wrap: wrap;
    margin-inline: 0;
    padding-inline: 0;
    overflow: visible;
  }
}

/* ---------- Gallery grid: 1 / 2 / 3 columns ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  transition: opacity 160ms var(--ease);   /* SWITCH_MS in gallery.js */
}

.grid.is-switching {
  opacity: 0;
}

/* Notices (empty / error) span the whole grid row */
.grid > .notice {
  grid-column: 1 / -1;
}

@media (min-width: 640px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
}

.card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-base) var(--ease), transform var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.card--link {
  color: inherit;
  text-decoration: none;
}

.card--link:hover {
  color: inherit;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card--link:focus-visible {
  outline-offset: 2px;
}

.card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-base) var(--ease);
}

.card--link:hover .card__media img {
  transform: scale(1.03);
}

.card__badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: rgba(15, 42, 68, 0.88);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
}

.card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
}

.card__category {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-accent);
}

.card__title {
  margin: 0;
  font-size: var(--fs-lg);
  line-height: 1.35;
}

.card__date {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

/* Skeleton card shown while index.json loads */
.card--skeleton .card__line {
  height: 12px;
  margin-bottom: var(--space-2);
  border-radius: 2px;
  background: var(--color-grid);
}

.card--skeleton .card__line:last-child {
  width: 60%;
  margin-bottom: 0;
}

/* ---------- Notices: empty category / load error ---------- */
.notice {
  margin: 0;
  padding: var(--space-6) var(--space-5);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text-muted);
  text-align: center;
}

.notice--error {
  border-style: solid;
  border-color: #E3B6B6;
  background: #FDF6F6;
  color: #8A2A2A;
}

/* ---------- Latest / featured project card ---------- */
.feature {
  display: grid;
  overflow: hidden;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.feature__media {
  display: block;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.feature__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-base) var(--ease);
}

.feature__media:hover img {
  transform: scale(1.02);
}

.feature__body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-5);
}

.feature__badge {
  padding: 2px var(--space-2);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-accent);
}

.feature__title {
  margin: 0;
  font-size: var(--fs-2xl);
}

.feature__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.feature__category {
  color: var(--color-accent);
  font-weight: 500;
}

.feature__text {
  margin: 0;
  max-width: 52ch;
}

.feature__cta {
  margin-top: var(--space-2);
}

.btn:hover .btn__arrow--right {
  transform: translateX(3px);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  padding: 2px var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-primary);
}

@media (min-width: 960px) {
  .feature {
    grid-template-columns: 3fr 2fr;
  }

  .feature__media {
    aspect-ratio: auto;
    min-height: 100%;
    border-bottom: 0;
    border-right: 1px solid var(--color-border);
  }

  .feature__body {
    justify-content: center;
    padding: var(--space-7) var(--space-6);
  }
}

/* ---------- About ---------- */
.about {
  display: grid;
  gap: var(--space-6);
}

.about__text {
  max-width: 62ch;
  font-size: var(--fs-lg);
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--color-primary);
}

@media (min-width: 960px) {
  .about {
    grid-template-columns: 3fr 2fr;
    align-items: start;
  }
}

/* ---------- Footer: technical drawing title block ---------- */
.site-footer {
  padding-block: var(--space-7) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

/* Cell borders come from the 1px grid gap showing the navy background,
   so the lines stay correct however the cells wrap. */
.title-block {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas: "title" "drawn" "date" "time" "email" "scale" "sheet";
  /* Like a drawing title block: thick outer frame, clearly visible inner lines */
  gap: 2px;
  background: var(--color-primary);
  border: 3px solid var(--color-primary);
  font-family: var(--font-mono);
}

.title-block__cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
  padding: var(--space-2) var(--space-3);
  background: var(--color-paper);
}

.title-block__cell:nth-child(1) { grid-area: title; }
.title-block__cell:nth-child(2) { grid-area: drawn; }
.title-block__cell:nth-child(3) { grid-area: date; }
.title-block__cell:nth-child(4) { grid-area: time; }
.title-block__cell:nth-child(5) { grid-area: email; }
.title-block__cell:nth-child(6) { grid-area: scale; }
.title-block__cell:nth-child(7) { grid-area: sheet; }

/* Title cell: no label, text centred like the title field of a drawing title block */
.title-block__cell--title {
  justify-content: center;
  align-items: center;
  text-align: center;
}

.title-block__label {
  font-size: var(--fs-xs);
  text-transform: lowercase;
  color: var(--color-text-muted);
}

.title-block__value {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-primary);
  overflow-wrap: anywhere;
}

.title-block__value--lg {
  font-family: var(--font-sans);
  font-size: var(--fs-lg);
  font-weight: 700;
  line-height: var(--lh-tight);
}

.title-block__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-min);
  margin-block: calc((var(--tap-min) - 1.4em) / -2);
  color: var(--color-accent);
  text-decoration: none;
}

.title-block__link:hover {
  color: var(--color-primary-2);
  text-decoration: underline;
}

@media (min-width: 640px) {
  .title-block {
    grid-template-columns: repeat(2, 1fr);
    grid-template-areas:
      "title title"
      "drawn date"
      "time  scale"
      "email sheet";
  }
}

@media (min-width: 960px) {
  .title-block {
    grid-template-columns: 2fr 1fr 1fr 1fr;
    grid-template-areas:
      "title drawn date  time"
      "title email scale sheet";
  }

  .title-block__cell--title {
    padding: var(--space-4) var(--space-5);
  }
}

.site-footer__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.social {
  display: flex;
  gap: var(--space-2);
}

.social__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-min);
  height: var(--tap-min);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-primary);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.social__link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.social__link svg {
  width: 20px;
  height: 20px;
}

.site-footer__copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

@media (min-width: 640px) {
  .site-footer__meta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}