/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-control);
  padding: 14px 22px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-standard);
  text-decoration: none;
  line-height: 1.2;
}
.btn-primary { background: var(--color-blue); color: var(--color-white); }
.btn-primary:hover { background: var(--color-blue-hover); color: var(--color-white); text-decoration: none; }

.btn-secondary { background: transparent; color: var(--color-ink); border-color: var(--color-ink); padding: 13px 21px; }
.btn-secondary:hover { background: var(--color-ink); color: var(--color-white); text-decoration: none; }

.btn-secondary--on-dark { color: var(--color-surface); border-color: var(--color-surface); }
.btn-secondary--on-dark:hover { background: var(--color-surface); color: var(--color-ink); }

.btn-disabled, .btn:disabled {
  background: var(--color-line);
  color: var(--color-white);
  border-color: var(--color-line);
  cursor: default;
}

/* Inputs */
.input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 16px;
  padding: 13px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-control);
  background: var(--color-white);
  color: var(--color-ink);
  transition: var(--transition-standard);
}
.input:focus { outline: none; border-color: var(--color-blue); box-shadow: 0 0 0 3px var(--color-blue-tint); }

/* Chips */
.chip {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 14px;
  border-radius: var(--radius-control);
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: var(--transition-standard);
  text-decoration: none;
  display: inline-block;
}
.chip:hover { text-decoration: none; border-color: var(--color-blue); }
.chip.is-active { background: var(--color-blue); color: var(--color-white); border-color: var(--color-blue); }
.chip.is-active:hover { color: var(--color-white); }

.chip-tag {
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--color-gray-500);
  border: 1px solid var(--color-line-soft);
  padding: 10px 16px;
}
.chip-tag--more {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-blue);
  border: 1px solid var(--color-blue-tint-border);
  background: var(--color-blue-tint);
  padding: 11px 16px;
}

/* List row (vertical filter rail) */
.list-row { padding: 11px 13px; cursor: pointer; }
.list-row.is-active { background: var(--color-blue); color: var(--color-white); font-weight: 500; }

/* Cards */
.card {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  padding: 22px;
  transition: var(--transition-standard);
}
.card:hover { border-color: var(--color-blue); }
.card--on-dark { border-color: var(--color-gray-700); background: var(--color-ink-2); }
.card--on-dark:hover { border-color: var(--color-blue-light); }
.card--highlight { border: 1px solid var(--color-line); border-left: 3px solid var(--color-blue); }
.card--tint { border-color: var(--color-blue); background: var(--color-blue-tint); }
.principle-icon { color: var(--color-blue); }

/* Nav links */
.nav-link {
  color: var(--color-ink);
  text-decoration: none;
  font-size: 15px;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: var(--transition-standard);
}
.nav-link:hover { color: var(--color-blue); text-decoration: none; }
.nav-link.is-active { color: var(--color-blue); border-bottom-color: var(--color-blue); }

/* Header */
.site-header { border-bottom: 1px solid var(--color-line); background: var(--color-white); position: sticky; top: 0; z-index: 20; }
.site-header__inner { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; justify-content: space-between; padding: 14px 0; position: relative; }
.site-header__brand { display: block; }
.site-header__logo { height: 28px; width: auto; display: block; }
.site-header__panel { display: flex; flex: 1 1 auto; flex-wrap: wrap; gap: 18px; align-items: center; justify-content: space-between; }
.site-header__nav { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }

/* Nav dropdown (Kurumsal, Hizmetler) — hover/focus on desktop, always expanded inline on mobile
   since the hamburger panel is already a full vertical list there. */
.nav-item-dropdown { position: relative; }
.nav-item-dropdown > .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.nav-item-dropdown > .nav-link::after {
  content: '\25BE';
  font-size: 10px;
  line-height: 1;
}
.nav-dropdown-panel {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: var(--color-white);
  border: 1px solid var(--color-line);
  min-width: 220px;
  z-index: 30;
  flex-direction: column;
  padding: 6px 0;
}
.nav-dropdown-panel a {
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}
.nav-dropdown-panel a:hover { background: var(--color-surface); color: var(--color-blue); text-decoration: none; }
.nav-item-dropdown:hover .nav-dropdown-panel,
.nav-item-dropdown:focus-within .nav-dropdown-panel { display: flex; }

@media (max-width: 860px) {
  .nav-item-dropdown { position: static; }
  .nav-dropdown-panel {
    display: flex !important;
    position: static;
    border: none;
    padding: 4px 0 4px 16px;
    margin-top: 6px;
    min-width: 0;
  }
  .nav-dropdown-panel a { padding: 6px 0; font-size: 15px; color: var(--color-gray-700); }
}
.site-header__actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.lang-switch { font-family: var(--font-mono); font-size: 13px; color: var(--color-gray-500); }

/* Mobile hamburger toggle — checkbox-hack so the menu opens/closes without JavaScript. */
.nav-toggle-input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.nav-toggle-btn {
  display: none;
  width: 26px;
  height: 18px;
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle-btn span {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-ink);
  transition: var(--transition-standard);
}
.nav-toggle-btn span:nth-child(1) { top: 0; }
.nav-toggle-btn span:nth-child(2) { top: 8px; }
.nav-toggle-btn span:nth-child(3) { top: 16px; }
.nav-toggle-input:checked ~ .nav-toggle-btn span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle-input:checked ~ .nav-toggle-btn span:nth-child(2) { opacity: 0; }
.nav-toggle-input:checked ~ .nav-toggle-btn span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
.nav-toggle-input:focus-visible ~ .nav-toggle-btn { outline: 2px solid var(--color-blue); outline-offset: 2px; }

@media (max-width: 860px) {
  .nav-toggle-btn { display: block; }
  .site-header__panel {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding-top: 18px;
    margin-top: 14px;
    border-top: 1px solid var(--color-line-soft);
  }
  .nav-toggle-input:checked ~ .site-header__panel { display: flex; }
  .site-header__nav { flex-direction: column; align-items: flex-start; gap: 14px; width: 100%; }
  .site-header__actions { flex-direction: column; align-items: stretch; width: 100%; gap: 10px; }
  .site-header__actions .btn { width: 100%; }
  .site-header__actions .lang-switch { align-self: flex-start; }
}

/* Footer */
.site-footer { background: var(--color-ink); color: var(--color-line-soft); }
.site-footer__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; padding-top: 48px; padding-bottom: 48px; }
.site-footer__logo { height: 26px; width: auto; display: block; }
.site-footer__tagline { font-family: var(--font-heading); font-size: 18px; margin-top: 14px; color: var(--color-gray-400); }
.site-footer__heading { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--color-gray-500); margin-bottom: 12px; }
.site-footer__links { display: flex; flex-direction: column; gap: 8px; font-size: 15px; list-style: none; margin: 0; padding: 0; }
.site-footer__links a { color: var(--color-line-soft); }
.site-footer__links a:hover { color: var(--color-white); }
.site-footer__contact { color: var(--color-gray-400); font-size: 15px; display: flex; flex-direction: column; gap: 6px; }
.site-footer__contact + .site-footer__contact { margin-top: 14px; }
.site-footer__bottom { border-top: 1px solid var(--color-gray-700); padding: 20px 0; font-family: var(--font-mono); font-size: 12px; color: var(--color-gray-500); }

.site-footer__social { display: flex; gap: 14px; margin-top: 18px; }
.site-footer__social a { color: var(--color-gray-400); display: inline-flex; }
.site-footer__social a:hover { color: var(--color-white); }

.site-footer__privacy { border-top: 1px solid var(--color-gray-700); padding: 28px 0 24px; display: flex; flex-wrap: wrap; gap: 20px; align-items: center; justify-content: space-between; }
.site-footer__privacy p { font-size: 14px; line-height: 1.55; color: var(--color-gray-400); max-width: 56ch; margin: 0; }
.site-footer__privacy-links { display: flex; flex-wrap: wrap; gap: 8px; flex-shrink: 0; }
.site-footer__privacy-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-gray-400);
  border: 1px solid var(--color-gray-700);
  padding: 8px 12px;
  text-decoration: none;
  white-space: nowrap;
}
.site-footer__privacy-links a:hover { color: var(--color-white); border-color: var(--color-gray-400); text-decoration: none; }

/* Stat blocks (dark proof sections) */
.stat-block { border: 1px solid var(--color-gray-700); padding: 22px 20px; }
.stat-block__value { font-family: var(--font-heading); font-size: 52px; font-weight: 500; line-height: 1; color: var(--color-blue-light); }
.stat-block__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; color: var(--color-gray-400); margin-top: 8px; }

.stat-block--light { border: 1px solid var(--color-line); padding: 20px 18px; }
.stat-block--light .stat-block__value { font-size: 34px; color: var(--color-blue); }
.stat-block--light .stat-block__label { color: var(--color-gray-500); }

/* Project cards */
.project-card { border: 1px solid var(--color-gray-700); background: var(--color-ink-2); padding: 22px 20px; transition: var(--transition-standard); }
.project-card:hover { border-color: var(--color-blue-light); }
.project-card__sector { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--color-gray-400); }
.project-card__name { font-family: var(--font-heading); font-size: 21px; font-weight: 500; line-height: 1.2; margin: 12px 0 4px; }
.project-card__client { font-size: 14px; color: var(--color-gray-400); margin-bottom: 14px; }
.project-card__solution { border-top: 1px solid var(--color-gray-700); padding-top: 14px; font-size: 15px; line-height: 1.55; color: var(--color-line-soft); }
.project-card__tech { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.tech-chip { font-family: var(--font-mono); font-size: 11px; border: 1px solid var(--color-gray-700); color: var(--color-gray-400); padding: 4px 8px; }

/* Process strip */
.process-step {
  border-radius: var(--radius-control);
  padding: 16px 14px;
  cursor: pointer;
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-ink);
  transition: var(--transition-standard);
  text-align: left;
  font-family: var(--font-body);
}
.process-step.is-active { background: var(--color-blue); border-color: var(--color-blue); color: var(--color-white); }
.process-step__no { font-family: var(--font-mono); font-size: 11px; opacity: 0.75; }
.process-step__label { font-family: var(--font-heading); font-size: 18px; font-weight: 500; margin-top: 8px; }

.process-detail {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  padding: 26px 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.process-detail__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--color-blue); }
.process-detail__body { font-size: 18px; line-height: 1.55; margin-top: 10px; }
.process-detail__duration { font-family: var(--font-heading); font-size: 30px; font-weight: 500; margin-top: 10px; }

/* Support steps + qualities */
.support-step { border: 1px solid var(--color-line); background: var(--color-white); padding: 18px 16px; }
.support-step__no { font-family: var(--font-mono); font-size: 11px; color: var(--color-blue); }
.support-step__label { font-size: 16px; margin-top: 8px; }

.quality-card { padding: 18px 16px; }
.quality-card__title { font-family: var(--font-heading); font-size: 18px; font-weight: 500; }
.quality-card__text { font-size: 15px; line-height: 1.5; color: var(--color-gray-700); margin-top: 6px; }

/* Score bars (AI assessment) */
.score-bar { height: 8px; background: var(--color-line-soft); }
.score-bar__fill { height: 8px; background: var(--color-blue); transition: width 200ms ease; }
.score-bar--thin { height: 4px; background: var(--color-line-soft); }
.score-bar--thin .score-bar__fill { height: 4px; }

.assessment-option {
  border-radius: var(--radius-control);
  padding: 13px 14px;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid var(--color-line);
  background: var(--color-white);
  transition: var(--transition-standard);
  text-align: left;
  font-family: var(--font-body);
  width: 100%;
}
.assessment-option:hover { border-color: var(--color-blue); }
.assessment-option.is-selected { border-color: var(--color-blue); background: var(--color-blue-tint); }
.assessment-option__key { font-family: var(--font-mono); font-size: 12px; opacity: 0.7; }

.big-score { font-family: var(--font-heading); font-weight: 500; line-height: 1; color: var(--color-blue-light); }
.dimension-result-row {
  border: 1px solid var(--color-line);
  padding: 22px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  align-items: center;
}

/* Accordion (native <details>/<summary> — works with JavaScript disabled) */
.accordion-list { border: 1px solid var(--color-line); background: var(--color-line); display: grid; gap: 1px; }
.accordion-item { background: var(--color-white); }
.accordion-item > summary {
  padding: 20px 22px;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: baseline;
  cursor: pointer;
  list-style: none;
}
.accordion-item > summary::-webkit-details-marker { display: none; }
.accordion-item__category { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--color-gray-500); margin-bottom: 6px; }
.accordion-item__question { font-size: 18px; line-height: 1.4; font-weight: 500; }
.accordion-item__sign { font-family: var(--font-mono); font-size: 18px; color: var(--color-blue); }
.accordion-item__sign::before { content: '+'; }
.accordion-item[open] .accordion-item__sign::before { content: '\2212'; }
.accordion-item__answer { padding: 0 22px 22px; font-size: 16px; line-height: 1.65; color: var(--color-gray-700); max-width: 76ch; }

/* Filter rail (vertical topic/sector list with counts) */
.filter-rail { display: flex; flex-direction: column; gap: 1px; background: var(--color-line); border: 1px solid var(--color-line); }
.filter-rail .list-row { background: var(--color-white); display: flex; justify-content: space-between; gap: 10px; font-size: 15px; text-decoration: none; color: var(--color-ink); border: none; }
.filter-rail .list-row:hover { text-decoration: none; }
.filter-rail .list-row__count { font-family: var(--font-mono); font-size: 12px; opacity: 0.7; }

/* Product blocks */
.product-card {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  padding: clamp(24px, 3vw, 36px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  align-items: start;
}
.product-card__name { font-family: var(--font-heading); font-size: clamp(28px, 3.4vw, 40px); font-weight: 500; line-height: 1.05; }
.product-card__domain { font-family: var(--font-mono); font-size: 12px; color: var(--color-gray-500); }
.product-card__tagline { font-family: var(--font-heading); font-size: 20px; font-weight: 400; line-height: 1.3; color: var(--color-blue); margin-top: 10px; }
.product-card__text { font-size: 17px; line-height: 1.6; color: var(--color-gray-700); margin-top: 16px; max-width: 54ch; }

.info-box { border: 1px solid var(--color-line-soft); padding: 20px 18px; }
.info-box--muted { background: var(--color-surface); }
.feature-row { display: flex; gap: 10px; align-items: baseline; font-size: 15px; line-height: 1.5; color: var(--color-gray-700); }
.feature-row__marker { font-family: var(--font-mono); font-size: 12px; color: var(--color-blue); }

.tech-chip--light { font-family: var(--font-mono); font-size: 11px; border: 1px solid var(--color-line-soft); background: var(--color-surface); color: var(--color-gray-500); padding: 5px 9px; }

/* Project Explorer result cards (whole card is a link) */
.project-result-card {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  transition: var(--transition-standard);
}
.project-result-card:hover { border-color: var(--color-blue); text-decoration: none; }
.project-result-card__meta { display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--color-gray-500); }
.project-result-card__name { font-family: var(--font-heading); font-size: 21px; font-weight: 500; line-height: 1.2; }
.project-result-card__client { font-size: 14px; color: var(--color-gray-500); margin-top: 4px; }
.project-result-card__solution { border-top: 1px solid var(--color-line-soft); padding-top: 12px; font-size: 15px; line-height: 1.55; color: var(--color-gray-700); }
.project-result-card__tech { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }

.meta-chip { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--color-gray-500); border: 1px solid var(--color-line-soft); background: var(--color-surface); padding: 6px 10px; }

.filter-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--color-white);
  border: 1px solid var(--color-blue);
  color: var(--color-blue);
  padding: 6px 10px;
  text-decoration: none;
  display: inline-block;
}
.filter-tag:hover { text-decoration: none; color: var(--color-blue-hover); border-color: var(--color-blue-hover); }

.similar-project-card { border: 1px solid var(--color-line); padding: 20px 18px; text-decoration: none; color: inherit; display: block; transition: var(--transition-standard); }
.similar-project-card:hover { border-color: var(--color-blue); text-decoration: none; }

/* Chip-styled radio/checkbox inputs (sector, systems, timing, size pickers) — native form
   controls under the hood, :has() drives the active visual state with no JavaScript. */
.chip-input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.chip-label {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 9px 13px;
  border-radius: var(--radius-control);
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: var(--transition-standard);
  display: inline-block;
}
.chip-label:has(.chip-input:checked) { background: var(--color-blue); color: var(--color-white); border-color: var(--color-blue); }
.chip-label:has(.chip-input:focus-visible) { outline: 2px solid var(--color-blue); outline-offset: 2px; }

/* Honeypot field — off-screen for people, still reachable by simple bots that fill every field. */
.honeypot-field { position: absolute; left: -9999px; top: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* Placeholder box for content pending confirmation (see Design/README.md açık konular) */
.placeholder-box { border: 1px dashed var(--color-line); background: var(--color-surface); padding: 24px 22px; }
.placeholder-box__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--color-gray-500); }
.placeholder-box__text { font-size: 16px; line-height: 1.6; color: var(--color-gray-700); margin-top: 10px; max-width: 62ch; }

/* World (Kurumsal) top tab strip */
.world-nav { border-bottom: 1px solid var(--color-line); background: var(--color-surface); }
.world-nav__inner { padding: 14px 0; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

/* Closing CTA */
.cta-box { border: 1px solid var(--color-blue); background: var(--color-blue-tint); padding: clamp(28px, 4vw, 56px); }

/* Reference/partner logo strip */
.reference-logos { display: flex; flex-wrap: wrap; align-items: center; gap: 28px; }
.reference-logos__item { height: 32px; max-width: 120px; object-fit: contain; filter: grayscale(1) opacity(0.7); transition: var(--transition-standard); }
.reference-logos__item:hover { filter: grayscale(0) opacity(1); }