/* Hashtag Robotics, kurumsal site
   Açık, renksiz (saf endüstriyel), kurumsal ve ölçülü.
   Renk yok; hiyerarşi tipografi, boşluk ve ince çizgilerle kuruluyor. */

:root {
  --bg: #EDEFF2;
  --bg-alt: #E5E7EB;
  --bg-deep: #DDE0E5;
  --ink: #16181D;
  --ink-soft: #2C2F36;
  --muted: #565B63;
  --faint: #8A9099;
  --line: #E4E6EA;
  --line-strong: #CDD1D8;
  --white: #FCFCFD;
  --grid: rgba(22,24,29,0.035);
  --ring: rgba(22,24,29,0.08);
  --btn-bg: var(--ink);
  --btn-bg-hover: #000000;
  --btn-fg: var(--bg);

  --mono: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --container: 1180px;
  --radius: 3px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }

html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

img { max-width: 100%; display: block; }
a { color: inherit; }

/* ---------- layout ---------- */
.container {
  width: min(var(--container), 100% - 3rem);
  margin-inline: auto;
}
.container--narrow { max-width: 860px; }

.section { padding: clamp(4rem, 9vw, 8.5rem) 0; }
.section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section-head { max-width: 62ch; margin-bottom: clamp(2.2rem, 4vw, 3.4rem); }
.section-head--center { margin-inline: auto; text-align: center; }

/* ---------- typography ---------- */
h1, h2, h3, h4 { margin: 0; font-weight: 680; line-height: 1.08; letter-spacing: -0.02em; text-wrap: balance; }

.eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.25rem;
}
.eyebrow--line::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--line-strong);
  vertical-align: middle;
  margin-right: 0.75rem;
}

.h-display { font-size: clamp(2.9rem, 7vw, 5.5rem); font-weight: 720; letter-spacing: -0.035em; }
.h-section { font-size: clamp(1.85rem, 3.6vw, 2.85rem); }
.h-sub { font-size: clamp(1.15rem, 2vw, 1.45rem); font-weight: 640; }

.lead {
  font-size: clamp(1.05rem, 1.5vw, 1.24rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 60ch;
}
p { margin: 0 0 1rem; color: var(--muted); max-width: 68ch; }
p.tight { margin: 0; }
strong { color: var(--ink); font-weight: 650; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(13px);
  backdrop-filter: saturate(1.4) blur(13px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.brand { display: inline-flex; align-items: center; }
.brand-logo { height: 22px; width: auto; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-size: 0.93rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color 0.18s var(--ease);
  position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a[aria-current="page"] { color: var(--ink); }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1.5px;
  background: var(--ink);
}
.nav-cta {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}
.nav-cta:hover { border-color: var(--btn-bg); background: var(--btn-bg); color: var(--btn-fg); }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
  color: var(--ink);
}
.nav-toggle svg { display: block; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font: inherit;
  font-weight: 600;
  letter-spacing: -0.01em;
  padding: 0.85em 1.5em;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn svg { width: 1em; height: 1em; }
.btn-primary { background: var(--btn-bg); color: var(--btn-fg); }
.btn-primary:hover { background: var(--btn-bg-hover); transform: translateY(-1px); }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-secondary:hover { border-color: var(--btn-bg); background: var(--btn-bg); color: var(--btn-fg); transform: translateY(-1px); }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 2rem; }

.textlink {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1.5px solid var(--line-strong);
  padding-bottom: 1px;
  transition: border-color 0.18s var(--ease), gap 0.18s var(--ease);
}
.textlink:hover { border-color: var(--ink); gap: 0.65em; }
.textlink svg { width: 0.85em; height: 0.85em; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: clamp(4.5rem, 11vw, 9rem) 0 clamp(3.5rem, 7vw, 6rem);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero-cover {
  position: absolute;
  inset: 0;
  background: url('assets/kapak1.png') no-repeat right center / cover;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, transparent 40%, #000 92%);
  mask-image: linear-gradient(to right, transparent 0%, transparent 40%, #000 92%);
  pointer-events: none;
}
[data-theme="dark"] .hero-cover { opacity: 0.28; }
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(120% 90% at 78% 20%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(120% 90% at 78% 20%, #000 0%, transparent 72%);
  pointer-events: none;
}
.hero .container { position: relative; }
.hero h1 { margin: 0.4rem 0 1.6rem; max-width: 14ch; }
.hero .lead { max-width: 54ch; }

/* ---------- feature grid (ilkeler / farklar) ---------- */
.grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.cell {
  background: var(--bg);
  padding: clamp(1.6rem, 2.6vw, 2.4rem);
}
.section--alt .cell { background: var(--bg-alt); }
.cell-index {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--faint);
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}
.cell h3 { margin-bottom: 0.7rem; }
.cell p { margin: 0; font-size: 0.98rem; }

/* ---------- split (metin + yan) ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
.split--textleft { grid-template-columns: 1.05fr 0.95fr; }
.prose p { font-size: 1.05rem; }
.prose p + p { margin-top: 0.25rem; }

/* mission / vision panel */
.mv {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.mv > div { background: var(--bg); padding: clamp(1.8rem, 3vw, 2.8rem); }
.section--alt .mv > div { background: var(--bg-alt); }
.mv h3 { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); font-weight: 500; margin-bottom: 1rem; }
.mv p { font-size: 1.1rem; color: var(--ink-soft); margin: 0; }

/* ---------- values (numbered list) ---------- */
.values { border-top: 1px solid var(--line); }
.value {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1.5rem;
  padding: 1.7rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.value-num { font-family: var(--mono); font-size: 0.85rem; color: var(--faint); }
.value h3 { font-size: 1.15rem; margin-bottom: 0.35rem; }
.value p { margin: 0; }

/* ---------- timeline ---------- */
.timeline { border-left: 1.5px solid var(--line-strong); margin-left: 6px; }
.tl-item { position: relative; padding: 0 0 2.4rem 2.2rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -6.5px; top: 6px;
  width: 11px; height: 11px;
  background: var(--bg);
  border: 2px solid var(--ink);
  border-radius: 50%;
}
.tl-year { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; }
.tl-item h3 { font-size: 1.1rem; margin: 0.4rem 0 0.5rem; }
.tl-item p { margin: 0; font-size: 0.98rem; }

/* ---------- team ---------- */
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.member { background: var(--bg); padding: clamp(1.6rem, 2.5vw, 2.2rem); }
.section--alt .member { background: var(--bg-alt); }
.member-mono {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-family: var(--mono); font-size: 0.9rem; color: var(--ink);
  margin-bottom: 1.2rem;
}
.member h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.member .role { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.04em; color: var(--muted); text-transform: uppercase; margin-bottom: 0.6rem; }
.member p { font-size: 0.94rem; margin: 0; }

/* ---------- roadmap ---------- */
.roadmap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.phase { background: var(--bg); padding: clamp(1.5rem, 2.4vw, 2.1rem); }
.section--alt .phase { background: var(--bg-alt); }
.phase-tag { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 1rem; display: flex; align-items: center; gap: 0.6rem; }
.phase-tag span { color: var(--faint); }
.phase p { font-size: 0.96rem; margin: 0; }

/* ---------- highlight list ---------- */
.hl { list-style: none; margin: 1.6rem 0 0; padding: 0; display: grid; gap: 0.9rem; }
.hl li { position: relative; padding-left: 1.5rem; color: var(--muted); font-size: 0.98rem; max-width: 62ch; }
.hl li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 7px; height: 7px; border: 1.5px solid var(--ink); border-radius: 50%; }
.hl li strong { color: var(--ink); }

/* small note */
.note { font-size: 0.9rem; color: var(--faint); border-left: 2px solid var(--line-strong); padding-left: 1rem; margin-top: 1.6rem; max-width: 60ch; }

/* spec chips */
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.4rem 0 0; padding: 0; list-style: none; }
.chips li { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-soft); border: 1px solid var(--line-strong); border-radius: 100px; padding: 0.35rem 0.8rem; }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li { padding: 1.1rem 0; border-bottom: 1px solid var(--line); }
.contact-list li:first-child { border-top: 1px solid var(--line); }
.contact-label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); display: block; margin-bottom: 0.3rem; }
.contact-value { font-size: 1.05rem; color: var(--ink); text-decoration: none; }
a.contact-value:hover { text-decoration: underline; text-underline-offset: 3px; }

.form { display: grid; gap: 1.1rem; }
.field { display: grid; gap: 0.45rem; }
.field label { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.field input, .field textarea {
  font: inherit;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px var(--ring);
}
.field textarea { resize: vertical; min-height: 130px; }

/* ---------- CTA band ---------- */
.cta { text-align: center; }
.cta h2 { max-width: 18ch; margin-inline: auto; }
.cta .lead { margin-inline: auto; text-align: center; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
  padding: clamp(3rem, 6vw, 4.5rem) 0 2.2rem;
}
.footer-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 2.5rem; padding-bottom: 2.5rem; border-bottom: 1px solid var(--line-strong); }
.footer-brand { max-width: 30ch; display: flex; flex-direction: column; }
.footer-brand img { height: 22px; width: auto; margin-bottom: 1rem; }
.footer-brand p { font-size: 0.92rem; margin: 0; }
.footer-cols { display: flex; gap: clamp(2.5rem, 6vw, 5rem); flex-wrap: wrap; }
.footer-col h4 { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); font-weight: 500; margin-bottom: 1rem; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.footer-col a { font-size: 0.94rem; color: var(--muted); text-decoration: none; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; padding-top: 1.8rem; }
.footer-bottom p { font-size: 0.82rem; color: var(--faint); margin: 0; }

/* footer ekosistem logolari */
.footer-eco { display: flex; align-items: center; gap: 1.6rem; width: 100%; padding-top: 2.6rem; margin-bottom: -1.5rem; }
.footer-eco .eco-strands { display: inline-flex; align-items: center; }
.footer-eco img { width: auto; display: block; opacity: 0.78; transition: opacity 0.18s var(--ease); }
.footer-eco .eco-strands:hover img, .footer-eco img:hover { opacity: 1; }
.footer-eco .strands-light, .footer-eco .strands-dark { height: 22px; }
.footer-eco .eco-hf { height: 29px; }
.footer-eco .strands-dark { display: none; }
[data-theme="dark"] .footer-eco .strands-light { display: none; }
[data-theme="dark"] .footer-eco .strands-dark { display: block; }

/* ---------- Ürünler açılır menüsü ---------- */
.has-dropdown { position: relative; display: flex; align-items: center; }
.nav-dd-toggle {
  display: inline-flex; align-items: center; gap: 0.32rem;
  font: inherit; font-size: 0.93rem; letter-spacing: -0.01em;
  color: var(--muted); background: none; border: 0; cursor: pointer; padding: 0;
  transition: color 0.18s var(--ease);
}
.has-dropdown:hover .nav-dd-toggle, .has-dropdown.open .nav-dd-toggle, .nav-dd-toggle[aria-current="page"] { color: var(--ink); }
.nav-dd-caret { transition: transform 0.2s var(--ease); }
.has-dropdown:hover .nav-dd-caret, .has-dropdown.open .nav-dd-caret { transform: rotate(180deg); }
.nav-dropdown {
  position: absolute; top: 100%; left: 50%;
  margin-top: 12px; min-width: 210px;
  list-style: none; padding: 0.5rem;
  background: var(--bg); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: 0 22px 46px -24px rgba(20,24,30,0.3);
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateX(-50%) translateY(6px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
  z-index: 70;
}
.has-dropdown:hover .nav-dropdown, .has-dropdown:focus-within .nav-dropdown, .has-dropdown.open .nav-dropdown {
  opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: block; padding: 0.62rem 0.8rem; border-radius: 8px;
  font-size: 0.92rem; color: var(--muted); text-decoration: none; white-space: nowrap;
  transition: background 0.15s var(--ease), color 0.15s var(--ease);
}
.nav-dropdown a:hover { background: var(--bg-alt); color: var(--ink); }

/* ---------- cam kart değişkenleri ---------- */
:root {
  --glass-bg: rgba(255,255,255,0.55);
  --glass-border: rgba(255,255,255,0.7);
  --glass-shadow: 0 24px 60px -34px rgba(20,24,30,0.4);
  --glass-shadow-hover: 0 34px 70px -32px rgba(20,24,30,0.5);
}
[data-theme="dark"] {
  --glass-bg: rgba(28,31,38,0.5);
  --glass-border: rgba(255,255,255,0.08);
  --glass-shadow: 0 24px 60px -30px rgba(0,0,0,0.7);
  --glass-shadow-hover: 0 34px 70px -28px rgba(0,0,0,0.8);
}

/* ---------- ürünler sayfası ---------- */
.products {
  position: relative;
  background:
    radial-gradient(75% 55% at 18% 0%, var(--bg-alt), transparent 60%),
    radial-gradient(65% 55% at 100% 25%, var(--bg-alt), transparent 55%);
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(208px, 248px));
  justify-content: start;
  gap: 1.2rem;
}
.product-card {
  display: flex; flex-direction: column;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  backdrop-filter: blur(16px) saturate(1.4);
  box-shadow: var(--glass-shadow);
  overflow: hidden;
  text-decoration: none; color: inherit;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.product-card:hover { transform: translateY(-5px); box-shadow: var(--glass-shadow-hover); }
.product-media {
  position: relative;
  aspect-ratio: 4 / 3;
  display: grid; place-items: center;
  padding: 1.4rem;
  background: linear-gradient(160deg, rgba(255,255,255,0.5), rgba(255,255,255,0));
}
[data-theme="dark"] .product-media { background: linear-gradient(160deg, rgba(255,255,255,0.05), transparent); }
.product-media img { max-height: 100%; width: auto; object-fit: contain; transition: transform 0.4s var(--ease); }
.product-card:hover .product-media img { transform: scale(1.04); }
.product-badge {
  position: absolute; top: 14px; left: 14px;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink); background: var(--bg);
  border: 1px solid var(--line-strong); border-radius: 100px;
  padding: 0.32rem 0.7rem;
}
.product-body { padding: 1.25rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.product-eyebrow { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.product-title { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; }
.product-desc { color: var(--muted); font-size: 0.88rem; margin: 0; }
.product-chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.2rem; }
.product-chips span { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-soft); border: 1px solid var(--line-strong); border-radius: 100px; padding: 0.25rem 0.6rem; }
.product-cta { display: inline-flex; align-items: center; gap: 0.4em; margin-top: auto; padding-top: 0.9rem; font-weight: 600; color: var(--ink); }
.product-cta svg { width: 0.85em; height: 0.85em; transition: transform 0.18s var(--ease); }
.product-card:hover .product-cta svg { transform: translateX(3px); }

/* mobilde Ürünler açılır menüsü */
@media (max-width: 720px) {
  .nav-links.open .has-dropdown { width: 100%; flex-direction: column; align-items: flex-start; }
  .nav-links.open .nav-dd-toggle { width: 100%; justify-content: space-between; padding: 0.85rem 0; border-bottom: 1px solid var(--line); color: var(--ink); }
  .nav-links.open .nav-dropdown {
    position: static; transform: none; opacity: 1; visibility: visible; pointer-events: auto;
    box-shadow: none; border: 0; background: transparent; margin: 0; padding: 0.1rem 0 0.4rem 0.9rem;
    min-width: 0; width: 100%; display: none;
  }
  .nav-links.open .has-dropdown.open .nav-dropdown { display: block; }
  .nav-links.open .nav-dropdown a { padding: 0.6rem 0; }
}

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .grid--3, .team-grid, .roadmap { grid-template-columns: 1fr 1fr; }
  .split, .split--textleft, .mv, .contact-grid { grid-template-columns: 1fr; }
  .mv { }
}
@media (max-width: 720px) {
  html { font-size: 16px; }
  .nav-links, .nav-cta { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 70px; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.5rem 1.2rem;
  }
  .nav-links.open li { width: 100%; }
  .nav-links.open a { display: block; padding: 0.85rem 0; border-bottom: 1px solid var(--line); width: 100%; }
  .nav-links.open a[aria-current="page"]::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .grid--3, .grid--2, .team-grid, .roadmap { grid-template-columns: 1fr; }
  .value { grid-template-columns: 2.5rem 1fr; gap: 1rem; }
  .footer-top { flex-direction: column; gap: 2rem; }
  .section { padding: 3.6rem 0; }
  .hero { padding: 3.5rem 0 2.8rem; }
  .hero-cover, [data-theme="dark"] .hero-cover { opacity: 0.16; }
  .section-head { margin-bottom: 2rem; }
  .btn-row .btn { flex: 1 1 auto; justify-content: center; }
}

/* çok küçük telefonlar */
@media (max-width: 420px) {
  .container { width: min(1180px, 100% - 2rem); }
  .h-display { font-size: clamp(2.4rem, 12vw, 3rem); }
  .footer-cols { gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ---------- koyu tema ---------- */
[data-theme="dark"] {
  --bg: #0E0F13;
  --bg-alt: #15171C;
  --bg-deep: #0A0B0E;
  --ink: #ECEEF2;
  --ink-soft: #C6CAD2;
  --muted: #98A0AC;
  --faint: #6C7480;
  --line: #23262E;
  --line-strong: #343A44;
  --white: #14161B;
  --grid: rgba(255,255,255,0.05);
  --ring: rgba(255,255,255,0.14);
  --btn-bg: var(--ink);
  --btn-bg-hover: #FFFFFF;
  --btn-fg: var(--bg);
}
/* siyah logoyu koyu zeminde beyaza çevir */
[data-theme="dark"] .brand-logo,
[data-theme="dark"] .footer-brand img { filter: invert(1) brightness(1.7); }

/* tema geçişini yumuşat */
body, .site-header, .site-footer, .section--alt, .cell, .member, .phase,
.mv > div, .grid, .mv, .team-grid, .roadmap, .value, .contact-list li {
  transition: background-color .35s var(--ease), border-color .35s var(--ease), color .35s var(--ease);
}

/* ---------- nav sağ grup + tema anahtarı ---------- */
.nav-right { display: flex; align-items: center; gap: 0.9rem; }
.nav-labs { display: inline-flex; align-items: center; padding: 4px 7px; border-radius: var(--radius); transition: background 0.16s var(--ease); }
.nav-labs:hover { background: var(--bg-alt); }
.nav-labs img { height: 26px; width: auto; display: block; }
[data-theme="dark"] .nav-labs img { filter: invert(1); }
.theme-toggle { display: inline-flex; align-items: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.theme-switch {
  font-size: 18px;
  --off: #c7cad1;
  --mid: #808690;
  --on: #2C2F36;
  --transDur: 0.5s;
  --tg-timing: cubic-bezier(0.6,0,0.4,1);
  --handle: #ffffff;
  background-color: var(--off);
  border-radius: 0.67em / 0.5em;
  box-shadow:
    0 0.05em 0.1em #00000007 inset,
    0 -0.25em 0.25em #0001 inset,
    0 -0.5em 0 #0001 inset,
    0 0.1em 0.1em #0001;
  cursor: pointer;
  position: relative;
  width: 2.25em;
  height: 1.5em;
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  flex: none;
}
.theme-switch:before {
  content: "";
  display: block;
  position: absolute;
  top: 0.125em;
  left: 0.125em;
  width: 1em;
  height: 0.75em;
  border-radius: 0.5em / 0.375em;
  background: var(--handle);
  box-shadow:
    0 0.175em 0.175em 0 #0001 inset,
    0 0.375em 0 #0002 inset,
    0 0.375em 0 var(--off) inset,
    0 0.475em 0.1em #0001 inset;
}
.theme-switch:checked { background-color: var(--on); }
.theme-switch:checked:before {
  left: 1.125em;
  box-shadow:
    0 0.175em 0.175em 0 #0001 inset,
    0 0.375em 0 #0002 inset,
    0 0.375em 0 var(--on) inset,
    0 0.475em 0.1em #0001 inset;
}
/* animasyon yalnızca kullanıcı etkileşince (pristine kalkınca) */
.theme-switch:not(.pristine) { animation: bgOff var(--transDur) var(--tg-timing); }
.theme-switch:not(.pristine):checked { animation: bgOn var(--transDur) var(--tg-timing); }
.theme-switch:not(.pristine):before { animation: handleOff var(--transDur) var(--tg-timing); }
.theme-switch:not(.pristine):checked:before { animation: handleOn var(--transDur) var(--tg-timing); }
.theme-switch:focus-visible { outline: 2px solid var(--on); outline-offset: 3px; }
[data-theme="dark"] .theme-switch { --off: #4a5160; --mid: #565b63; --on: #3A3F49; --handle: #e8eaee; }

@keyframes bgOff {
  from { background-color: var(--on); }
  50% { background-color: var(--mid); }
  to { background-color: var(--off); }
}
@keyframes bgOn {
  from { background-color: var(--off); }
  50% { background-color: var(--mid); }
  to { background-color: var(--on); }
}
@keyframes handleOff {
  from { box-shadow: 0 0.175em 0.175em 0 #0001 inset, 0 0.375em 0 #0002 inset, 0 0.375em 0 var(--on) inset, 0 0.475em 0.1em #0001 inset; left: 1.125em; width: 1em; }
  50% { box-shadow: 0 0.175em 0.175em 0 #0001 inset, 0 0.375em 0 #0002 inset, 0 0.375em 0 var(--mid) inset, 0 0.475em 0.1em #0001 inset; left: 0.125em; width: 2em; }
  to { box-shadow: 0 0.175em 0.175em 0 #0001 inset, 0 0.375em 0 #0002 inset, 0 0.375em 0 var(--off) inset, 0 0.475em 0.1em #0001 inset; left: 0.125em; width: 1em; }
}
@keyframes handleOn {
  from { box-shadow: 0 0.175em 0.175em 0 #0001 inset, 0 0.375em 0 #0002 inset, 0 0.375em 0 var(--off) inset, 0 0.475em 0.1em #0001 inset; left: 0.125em; width: 1em; }
  50% { box-shadow: 0 0.175em 0.175em 0 #0001 inset, 0 0.375em 0 #0002 inset, 0 0.375em 0 var(--mid) inset, 0 0.475em 0.1em #0001 inset; left: 0.125em; width: 2em; }
  to { box-shadow: 0 0.175em 0.175em 0 #0001 inset, 0 0.375em 0 #0002 inset, 0 0.375em 0 var(--on) inset, 0 0.475em 0.1em #0001 inset; left: 1.125em; width: 1em; }
}


/* ---------- SSS / FAQ ---------- */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 0.8rem; }
.faq-item { border: 1px solid var(--line); border-radius: 12px; background: var(--white); overflow: hidden; transition: border-color 0.2s var(--ease); }
.faq-item[open] { border-color: var(--line-strong); }
.faq-item summary { cursor: pointer; list-style: none; padding: 1.15rem 1.4rem; font-weight: 640; font-size: 1.06rem; letter-spacing: -0.01em; color: var(--ink); display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-family: var(--mono); font-size: 1.4rem; line-height: 1; color: var(--muted); transition: transform 0.22s var(--ease); flex: none; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 1.4rem 1.3rem; color: var(--muted); font-size: 1rem; line-height: 1.7; margin: 0; }
.faq-item .faq-a a { color: var(--ink); text-decoration: underline; text-underline-offset: 2px; }