/* ==========================================================================
   Oğuzhan Tuvanç — Elektronik Donanım & Ar-Ge
   Tasarım sistemi / Design system
   Tek CSS dosyası, derleme gerektirmez.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Token'lar
   -------------------------------------------------------------------------- */
:root {
  /* Yüzeyler */
  --bg:            #080c14;
  --bg-elev:       #0d131f;
  --surface:       #111a29;
  --surface-2:     #16202f;

  /* Kenarlıklar */
  --border:        rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.30);

  /* Metin — kontrast oranları bg üzerinde: text 15.2:1, muted 7.4:1, dim 5.1:1 */
  --text:          #e7eef8;
  --text-muted:    #9db0c8;
  --text-dim:      #7387a1;

  /* Vurgu */
  --accent:        #22d3ee;
  --accent-soft:   #7dd3fc;
  --accent-2:      #818cf8;
  --accent-glow:   rgba(34, 211, 238, 0.14);

  /* Tipografi */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas,
               'Liberation Mono', monospace;

  /* Ölçek */
  --step--1: clamp(0.82rem, 0.79rem + 0.15vw, 0.9rem);
  --step-0:  clamp(0.98rem, 0.95rem + 0.16vw, 1.06rem);
  --step-1:  clamp(1.15rem, 1.08rem + 0.35vw, 1.35rem);
  --step-2:  clamp(1.4rem, 1.26rem + 0.7vw, 1.85rem);
  --step-3:  clamp(1.75rem, 1.5rem + 1.25vw, 2.6rem);
  --step-4:  clamp(2.2rem, 1.7rem + 2.5vw, 3.9rem);

  /* Yerleşim */
  --container: 1120px;
  --gutter: clamp(1.15rem, 4vw, 2rem);
  --section-y: clamp(4rem, 9vw, 7.5rem);
  --radius: 14px;
  --radius-lg: 20px;

  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   2. Sıfırlama / temel
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--text);
  text-wrap: balance;
}

h1 { font-size: var(--step-4); letter-spacing: -0.035em; }
h2 { font-size: var(--step-3); letter-spacing: -0.028em; }
h3 { font-size: var(--step-1); }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--accent-soft); text-decoration: none; transition: color 0.18s ease; }
a:hover { color: var(--accent); }

ul { margin: 0; padding: 0; list-style: none; }

::selection { background: rgba(34, 211, 238, 0.28); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #04121a;
  padding: 0.7rem 1.1rem;
  font-weight: 600;
  z-index: 200;
}
.skip-link:focus { left: 0; }

/* --------------------------------------------------------------------------
   3. Yerleşim yardımcıları
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(2.75rem, 6vw, 4.5rem); }
.section--alt { background: linear-gradient(180deg, transparent, rgba(17, 26, 41, 0.55), transparent); }

.stack > * + * { margin-top: 1.1rem; }

.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.6rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr)); }

.lead {
  font-size: var(--step-1);
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 62ch;
}

.muted { color: var(--text-muted); }
.measure { max-width: 68ch; }
.center { text-align: center; }
.mx-auto { margin-inline: auto; }

/* --------------------------------------------------------------------------
   4. Bölüm başlıkları
   -------------------------------------------------------------------------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 500;
}
.eyebrow::before {
  content: '';
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
  flex: none;
}
.eyebrow--center { justify-content: center; }

.section-head { margin-bottom: clamp(2rem, 4vw, 3.25rem); max-width: 72ch; }
.section-head.center { margin-inline: auto; }
.section-head p { color: var(--text-muted); margin-bottom: 0; }

/* Vurgulu kelime — degrade iki açık tonda kalır, kontrast düşmez */
.hl {
  background: linear-gradient(100deg, #e7eef8 10%, var(--accent-soft) 55%, var(--accent) 95%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-soft); /* clip desteklenmezse geri düşüş */
}

/* --------------------------------------------------------------------------
   5. Navigasyon
   -------------------------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 12, 20, 0.78);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--text);
  letter-spacing: -0.015em;
  white-space: nowrap;
}
.brand:hover { color: var(--text); }
.brand__mark { width: 26px; height: 26px; flex: none; }
.brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  font-weight: 400;
  margin-top: 2px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 1.4vw, 0.6rem);
}

.nav__link {
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.93rem;
  font-weight: 500;
  transition: color 0.18s ease, background 0.18s ease;
  white-space: nowrap;
}
.nav__link:hover { color: var(--text); background: rgba(148, 163, 184, 0.09); }
.nav__link[aria-current='page'] { color: var(--text); background: rgba(34, 211, 238, 0.11); }

.nav__right { display: flex; align-items: center; gap: 0.55rem; }

.lang {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
}
.lang a {
  padding: 0.38rem 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  transition: background 0.18s ease, color 0.18s ease;
}
.lang a:hover { color: var(--text); background: rgba(148, 163, 184, 0.1); }
.lang a[aria-current='true'] { background: var(--accent); color: #04121a; }

.nav__toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  width: 40px;
  height: 40px;
  padding: 0;
  cursor: pointer;
  color: var(--text);
  align-items: center;
  justify-content: center;
}
.nav__toggle svg { width: 20px; height: 20px; }
.nav__toggle .icon-close { display: none; }
.nav__toggle[aria-expanded='true'] .icon-close { display: block; }
.nav__toggle[aria-expanded='true'] .icon-open { display: none; }

@media (max-width: 860px) {
  .nav__toggle { display: inline-flex; }
  .nav__links {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    padding: 1rem var(--gutter) 1.5rem;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    max-height: calc(100vh - 68px);
    overflow-y: auto;
  }
  .nav__links.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav__link { padding: 0.8rem 0.9rem; font-size: 1rem; }
}

/* --------------------------------------------------------------------------
   6. Butonlar
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.82rem 1.4rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.18s ease, border-color 0.18s ease,
              box-shadow 0.18s ease, color 0.18s ease;
  text-align: center;
  font-family: inherit;
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--accent);
  color: #04121a;
  box-shadow: 0 8px 26px -10px rgba(34, 211, 238, 0.65);
}
.btn--primary:hover {
  background: #67e8f9;
  color: #04121a;
  box-shadow: 0 12px 32px -10px rgba(34, 211, 238, 0.8);
}

.btn--ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: rgba(148, 163, 184, 0.05);
}
.btn--ghost:hover {
  border-color: rgba(34, 211, 238, 0.55);
  background: rgba(34, 211, 238, 0.09);
  color: var(--text);
}

.btn-row { display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* --------------------------------------------------------------------------
   7. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: clamp(3.5rem, 9vw, 7rem) clamp(3rem, 7vw, 5.5rem);
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  -webkit-mask-image: radial-gradient(90% 70% at 50% 25%, #000 30%, transparent 100%);
  mask-image: radial-gradient(90% 70% at 50% 25%, #000 30%, transparent 100%);
}
.hero__glow {
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}
.hero__glow--a {
  width: 45vw; height: 45vw; max-width: 560px; max-height: 560px;
  background: rgba(34, 211, 238, 0.13);
  top: -14%; left: -8%;
}
.hero__glow--b {
  width: 40vw; height: 40vw; max-width: 500px; max-height: 500px;
  background: rgba(129, 140, 248, 0.13);
  bottom: -20%; right: -6%;
}

.hero__inner { position: relative; z-index: 1; }

.hero__grid {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.5rem);
  grid-template-columns: 1fr;
  align-items: center;
}
@media (min-width: 940px) {
  .hero__grid { grid-template-columns: 1.08fr 0.92fr; }
}

.hero__title { margin-bottom: 1.1rem; }
.hero .lead { margin-bottom: 2rem; }

/* Cihaz künyesi paneli — hero'nun sağ sütunu */
.panel {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(22, 32, 47, 0.92), rgba(10, 15, 24, 0.85));
  box-shadow: 0 30px 60px -40px rgba(0, 0, 0, 1);
  overflow: hidden;
}
.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 12, 20, 0.6);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.panel__led {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent);
}
.panel__led::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.panel__body { padding: 0.5rem 1.1rem 1.1rem; }
.panel__row {
  display: grid;
  grid-template-columns: minmax(74px, 0.62fr) 1fr;
  gap: 0.9rem;
  padding: 0.7rem 0;
  border-bottom: 1px dashed var(--border);
  align-items: baseline;
}
.panel__row:last-child { border-bottom: 0; }
.panel__key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.panel__val { font-size: 0.92rem; color: var(--text); line-height: 1.45; }

.hero__status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border-strong);
  background: rgba(17, 26, 41, 0.7);
  padding: 0.42rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1.6rem;
}
.hero__status::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
  flex: none;
}

/* --------------------------------------------------------------------------
   8. Kartlar
   -------------------------------------------------------------------------- */
.card {
  background: linear-gradient(160deg, rgba(22, 32, 47, 0.9), rgba(13, 19, 31, 0.75));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.3rem, 2.6vw, 1.75rem);
  position: relative;
  transition: border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
  height: 100%;
}
.card:hover {
  border-color: rgba(34, 211, 238, 0.32);
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.9), 0 0 0 1px var(--accent-glow);
}
.card h3 { margin-bottom: 0.55rem; }
.card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 0; }
.card--flat:hover { transform: none; }

.card__icon {
  width: 42px; height: 42px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.22);
  color: var(--accent);
  margin-bottom: 1.1rem;
}
.card__icon svg { width: 21px; height: 21px; }

/* Liste kartı */
.list-check { display: grid; gap: 0.6rem; margin-top: 0.4rem; }
.list-check li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  color: var(--text-muted);
  font-size: 0.93rem;
  line-height: 1.5;
}
.list-check svg { width: 16px; height: 16px; color: var(--accent); flex: none; margin-top: 0.25em; }

/* --------------------------------------------------------------------------
   9. İstatistik / veri şeridi
   -------------------------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat { background: var(--bg-elev); padding: 1.4rem 1.25rem; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.stat__label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   10. Datasheet / teknik özellik tablosu
   -------------------------------------------------------------------------- */
.spec {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  display: grid;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-top: 1.1rem;
}
.spec__row {
  display: grid;
  grid-template-columns: minmax(90px, 0.8fr) 1.2fr;
  gap: 0.75rem;
  background: rgba(8, 12, 20, 0.6);
  padding: 0.5rem 0.8rem;
}
.spec__key { color: var(--text-dim); letter-spacing: 0.04em; text-transform: uppercase; font-size: 0.68rem; align-self: center; }
.spec__val { color: var(--text); }

/* Etiketler */
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1.1rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  border: 1px solid var(--border-strong);
  background: rgba(148, 163, 184, 0.06);
  padding: 0.24rem 0.55rem;
  border-radius: 6px;
  white-space: nowrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.24rem 0.6rem;
  border-radius: 999px;
  border: 1px solid;
}
.badge--proto { color: #fbbf24; border-color: rgba(251, 191, 36, 0.35); background: rgba(251, 191, 36, 0.09); }
.badge--field { color: #34d399; border-color: rgba(52, 211, 153, 0.35); background: rgba(52, 211, 153, 0.09); }
.badge--year  { color: var(--text-dim); border-color: var(--border-strong); background: rgba(148, 163, 184, 0.06); }

/* --------------------------------------------------------------------------
   11. Proje kartı
   -------------------------------------------------------------------------- */
.project {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.project__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
}
.project__meta { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.9rem; }
.project h3 { margin-bottom: 0; }

/* --------------------------------------------------------------------------
   12. Süreç adımları
   -------------------------------------------------------------------------- */
.steps { counter-reset: step; display: grid; gap: 1px; background: var(--border);
         border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
         grid-template-columns: repeat(auto-fit, minmax(min(100%, 175px), 1fr)); }
.step { background: var(--bg-elev); padding: 1.35rem 1.2rem; }
.step__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.14em;
  margin-bottom: 0.7rem;
}
.step h3 { font-size: 1rem; margin-bottom: 0.3rem; }
.step p { font-size: 0.87rem; color: var(--text-muted); margin: 0; }

/* --------------------------------------------------------------------------
   13. Zaman çizelgesi (deneyim)
   -------------------------------------------------------------------------- */
.timeline { display: grid; gap: 0; position: relative; }
.timeline__item {
  position: relative;
  padding: 0 0 2.1rem 1.9rem;
  border-left: 1px solid var(--border-strong);
}
.timeline__item:last-child { padding-bottom: 0; border-left-color: transparent; }
.timeline__item::before {
  content: '';
  position: absolute;
  left: -5px; top: 6px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.14);
}
.timeline__date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.timeline h3 { font-size: 1.05rem; margin-bottom: 0.15rem; }
.timeline__org { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.6rem; }
.timeline p { color: var(--text-muted); font-size: 0.93rem; margin-bottom: 0; }

/* --------------------------------------------------------------------------
   14. İletişim / form
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  align-items: start;
}

.contact-item {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:last-of-type { border-bottom: 0; }
.contact-item__icon {
  width: 36px; height: 36px; flex: none;
  border-radius: 9px;
  display: grid; place-items: center;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.2);
  color: var(--accent);
}
.contact-item__icon svg { width: 17px; height: 17px; }
.contact-item__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.15rem;
}
.contact-item__value { color: var(--text); font-size: 0.97rem; word-break: break-word; }
a.contact-item__value:hover { color: var(--accent); }

.form { display: grid; gap: 1rem; }
.field { display: grid; gap: 0.4rem; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.field .req { color: var(--accent); }

input, select, textarea {
  width: 100%;
  background: rgba(8, 12, 20, 0.7);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
input::placeholder, textarea::placeholder { color: #55687f; }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.14);
  background: rgba(8, 12, 20, 0.95);
}
textarea { resize: vertical; min-height: 130px; line-height: 1.6; }
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239db0c8' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  background-size: 17px;
  padding-right: 2.4rem;
}
select option { background: var(--surface); color: var(--text); }

.form__note { font-size: 0.82rem; color: var(--text-dim); margin: 0; }

.form__status {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  font-size: 0.9rem;
  display: none;
  border: 1px solid;
  line-height: 1.5;
}
.form__status.is-visible { display: block; }
.form__status--ok   { color: #6ee7b7; border-color: rgba(52, 211, 153, 0.4); background: rgba(52, 211, 153, 0.1); }
.form__status--err  { color: #fca5a5; border-color: rgba(248, 113, 113, 0.4); background: rgba(248, 113, 113, 0.1); }

/* --------------------------------------------------------------------------
   15. CTA bandı
   -------------------------------------------------------------------------- */
.cta {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 140% at 50% 0%, rgba(34, 211, 238, 0.11), transparent 62%),
    linear-gradient(160deg, rgba(22, 32, 47, 0.95), rgba(13, 19, 31, 0.9));
  padding: clamp(2rem, 5vw, 3.25rem);
  text-align: center;
}
.cta h2 { margin-bottom: 0.7rem; }
.cta p { color: var(--text-muted); max-width: 54ch; margin-inline: auto; margin-bottom: 1.8rem; }
.cta .btn-row { justify-content: center; }

/* --------------------------------------------------------------------------
   16. Footer
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  padding-block: clamp(2.5rem, 5vw, 3.5rem) 2rem;
  margin-top: var(--section-y);
  background: var(--bg-elev);
}
.footer__grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  margin-bottom: 2.25rem;
}
.footer h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.9rem;
  font-weight: 500;
}
.footer__links { display: grid; gap: 0.5rem; }
.footer__links a { color: var(--text-muted); font-size: 0.92rem; }
.footer__links a:hover { color: var(--accent); }
.footer__bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.84rem;
  color: var(--text-dim);
}
.footer__tagline { color: var(--text-muted); font-size: 0.92rem; max-width: 34ch; }

.social { display: flex; gap: 0.5rem; }
.social a {
  width: 36px; height: 36px;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  display: grid; place-items: center;
  color: var(--text-muted);
  transition: all 0.18s ease;
}
.social a:hover { color: var(--accent); border-color: rgba(34, 211, 238, 0.5); background: rgba(34, 211, 238, 0.08); }
.social svg { width: 17px; height: 17px; }

/* --------------------------------------------------------------------------
   17. Sayfa başlığı (iç sayfalar)
   -------------------------------------------------------------------------- */
.page-head {
  padding-block: clamp(2.75rem, 6vw, 4.5rem) clamp(1.75rem, 4vw, 2.75rem);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-head__glow {
  position: absolute;
  top: -60%; left: 50%;
  transform: translateX(-50%);
  width: min(760px, 110%); height: 380px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, 0.1), transparent);
  pointer-events: none;
}
.page-head .container { position: relative; z-index: 1; }
.page-head h1 { margin-bottom: 0.6rem; }
.page-head p { color: var(--text-muted); max-width: 62ch; margin-bottom: 0; }

/* --------------------------------------------------------------------------
   18. Hareket / görünürlük
   -------------------------------------------------------------------------- */
/* İçerik varsayılan olarak GÖRÜNÜRDÜR. Animasyon yalnızca JS varsa devreye girer,
   böylece betik çalışmazsa hiçbir bölüm gizli kalmaz. */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
   19. Yazdırma
   -------------------------------------------------------------------------- */
@media print {
  .nav, .footer, .cta, .hero__bg, .hero__glow { display: none !important; }
  body { background: #fff; color: #000; }
  .card, .spec, .stats { border-color: #ccc; background: #fff; }
}