/* ============================================================
   AWS Cloud and AI Day Türkiye 2026 — Onkatec landing
   Sanat yönü: "Deep Cloud" — sinematik koyu tema.
   Design system bağlayıcıları: renk paleti, DM Sans 600 başlıklar,
   pill CTA'lar, generous whitespace.
   ============================================================ */

/* ---------- Fontlar ---------- */
@font-face {
  font-family: "DM Sans";
  src: url("assets/fonts/DMSans-VariableFont-latin.woff2") format("woff2-variations"),
       url("assets/fonts/DMSans-VariableFont-latin.woff2") format("woff2");
  font-weight: 100 1000;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
                 U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193,
                 U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "DM Sans";
  src: url("assets/fonts/DMSans-VariableFont-latin-ext.woff2") format("woff2-variations"),
       url("assets/fonts/DMSans-VariableFont-latin-ext.woff2") format("woff2");
  font-weight: 100 1000;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB,
                 U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ---------- Token'lar ---------- */
:root {
  --blue: #288DBD;
  --blue-hover: #2779A4;
  --blue-dark: #276A92;
  --blue-deep: #265578;
  --accent-lite: #8FD4EF;
  --aws-orange: #FF9900;

  --ink: #070C11;
  --ink-2: #0B121A;
  --surface: rgba(255, 255, 255, .05);
  --surface-hi: rgba(255, 255, 255, .08);
  --edge: rgba(255, 255, 255, .10);
  --edge-hi: rgba(255, 255, 255, .22);

  --fg: #FFFFFF;
  --fg-2: rgba(255, 255, 255, .70);
  --fg-3: rgba(255, 255, 255, .48);

  --font-heading: "DM Sans", sans-serif;
  --font-body: -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --r-pill: 24px;
  --r-block: 20px;
  --r-card: 16px;
  --r-input: 12px;

  --section-py: 120px;
  --container: 1200px;
  --gutter: 24px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 260ms;
}

@media (max-width: 900px) { :root { --section-py: 76px; } }
@media (max-width: 600px) { :root { --section-py: 58px; --gutter: 20px; } }

/* ---------- Reset & taban ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--fg-2);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--fg);
  margin: 0 0 16px;
  text-wrap: balance;
}
h1 { font-size: clamp(40px, 7.2vw, 82px); line-height: 1.0;  letter-spacing: -.05em; }
h2 { font-size: clamp(30px, 4.6vw, 54px); line-height: 1.06; letter-spacing: -.042em; }
h3 { font-size: clamp(20px, 2.3vw, 28px); line-height: 1.22; letter-spacing: -.032em; }
h4 { font-size: 18px; line-height: 1.35; letter-spacing: -.02em; }

p { margin: 0 0 18px; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent-lite);
  font-weight: 500;
  text-decoration: none;
  transition: color 140ms var(--ease);
}
a:hover { color: #BDE7F8; }

img, svg { max-width: 100%; display: block; }
strong { color: var(--fg); font-weight: 600; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section { padding-block: var(--section-py); position: relative; }

.eyebrow {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--accent-lite);
  margin: 0 0 14px;
}
/* Dar ekranda harf aralığı ve punto küçülür; uzun eyebrow'lar
   (ör. "Onkatec × AWS Cloud and AI Day") ikinci satıra taşmasın. */
@media (max-width: 700px) {
  .eyebrow { font-size: 10.5px; letter-spacing: .13em; }
}

.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head--center { max-width: 720px; margin-inline: auto; text-align: 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;
}

.skip-link {
  position: absolute; left: -9999px; top: 10px; z-index: 999;
  background: var(--blue); color: #fff;
  padding: 12px 22px; border-radius: var(--r-pill); font-weight: 600;
}
.skip-link:focus { left: 16px; }

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

/* ---------- Butonlar ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -.015em;
  padding: 15px 30px;
  border: 0;
  border-radius: var(--r-pill);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: box-shadow 200ms var(--ease), background 200ms var(--ease),
              border-color 200ms var(--ease), color 200ms var(--ease);
  will-change: transform;
}
.btn:hover { text-decoration: none; }

.btn--primary {
  background: linear-gradient(100deg, var(--blue), #5FC3EA);
  color: #04121A;
  box-shadow: 0 0 0 rgba(40, 141, 189, 0);
}
.btn--primary:hover { color: #04121A; box-shadow: 0 10px 40px rgba(40, 141, 189, .5); }

.btn--ghost { background: transparent; color: var(--fg); border: 1px solid var(--edge-hi); }
.btn--ghost:hover { background: var(--surface-hi); border-color: var(--accent-lite); color: var(--fg); }

.btn--lg { padding: 18px 36px; font-size: 17.5px; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); }
.js-off .reveal { opacity: 1; transform: none; }
.word { display: inline-block; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background 320ms var(--ease), backdrop-filter 320ms var(--ease),
              border-color 320ms var(--ease);
}
.nav--stuck {
  background: rgba(7, 12, 17, .8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--edge);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; height: 78px;
}
.nav__brand img { width: 150px; height: auto; }
.nav__actions { display: flex; align-items: center; gap: 26px; }
.nav__cta { padding: 11px 22px; font-size: 15px; }
.nav__progress {
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--accent-lite));
  transform: scaleX(0);
  transform-origin: 0 50%;
}
@media (max-width: 480px) {
  .nav__inner { height: 68px; }
  .nav__brand img { width: 118px; }
  .nav__cta { padding: 10px 16px; font-size: 14px; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-block: 150px 96px;
}

.hero__stage {
  position: absolute;
  inset: 0;
  z-index: 0;
  perspective: 1400px;
  perspective-origin: 50% 30%;
}
.hero__layer { position: absolute; inset: -18%; will-change: transform; }

.hero__layer--aurora {
  background:
    radial-gradient(42% 44% at 14% 22%, rgba(40, 141, 189, .62), transparent 62%),
    radial-gradient(48% 50% at 86% 74%, rgba(38, 85, 120, .70), transparent 60%),
    radial-gradient(34% 36% at 62% 6%, rgba(143, 212, 239, .22), transparent 66%),
    radial-gradient(30% 30% at 70% 55%, rgba(40, 141, 189, .30), transparent 68%);
  filter: blur(30px);
}
.hero__layer--grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .06) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 45%, #000 14%, transparent 74%);
  mask-image: radial-gradient(ellipse at 50% 45%, #000 14%, transparent 74%);
  transform-style: preserve-3d;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: .85;
}

.hero__spotlight {
  position: absolute;
  top: 0; left: 0;
  width: 700px; height: 700px;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle, rgba(143, 212, 239, .16), transparent 60%);
  transition: opacity 420ms var(--ease);
  will-change: transform;
}
.hero__vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 50% 45%, transparent 45%, rgba(7, 12, 17, .75) 100%),
    linear-gradient(180deg, rgba(7, 12, 17, .55) 0%, transparent 22%, transparent 70%, var(--ink) 100%);
}

/* Genişliği .container'dan devralır — daraltılırsa `margin-inline:auto`
   yüzünden ortalanır ve sayfanın geri kalanıyla sol hizası bozulur.
   Satır uzunluğu blok yerine tek tek metin öğelerinden sınırlanıyor. */
.hero__inner { position: relative; z-index: 1; }

/* ---- Go Cloud / Go DevOps / Go AI ----
   İlk iki satır dolgusuz, yalnızca kontur; "Go AI" dolu turuncu. Kontur
   tipografi h1 ile aynı ölçekte olsa bile onunla yarışmıyor — göz dolu
   olana gidiyor. Sponsor bölümündeki dev "PLATINUM" ile aynı dil. */
.hero__go {
  margin: 52px 0 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(40px, 6.4vw, 98px);
  line-height: .9;
  letter-spacing: -.05em;
  white-space: nowrap;
}
.hero__go-line {
  color: transparent;
  -webkit-text-stroke: 1.8px rgba(143, 212, 239, .5);
}
.hero__go-line--ai {
  color: var(--aws-orange);
  -webkit-text-stroke: 0;
}
/* text-stroke desteklenmezse satırlar görünmez kalmasın */
@supports not (-webkit-text-stroke: 1px #000) {
  .hero__go-line { color: var(--fg-3); }
}
html:not(.js-off) .hero__go-line { opacity: 0; }

@media (min-width: 1024px) {
  .hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 56px;
    align-items: center;
  }
  .hero__go { margin: 0; align-items: flex-end; text-align: right; }
}

@media (max-width: 1023px) {
  .hero__go { align-items: center; text-align: center; font-size: clamp(36px, 9.4vw, 62px); }
}

/* ---- Onkatec işaret ızgarası (hero sağ sütun) ----
   İzometrik dizilmiş marka işaretleri; imleç yaklaştıkça ocean blue'ya
   boyanıp iz bırakıyor, sonra sönüyor. Çizim canvas'ta yapılıyor. */
.hero__sub {
  font-size: clamp(17px, 1.9vw, 20px);
  color: var(--fg-2);
  max-width: 620px;
  margin-top: 26px;
}
.hero h1 { max-width: 900px; }
.hero h1 em {
  font-style: normal;
  background: linear-gradient(95deg, #5FC3EA, #288DBD 50%, #A8E0F5);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  /* Negatif letter-spacing kutuyu son harfin bitiminden önce kapatıyor ve
     background-clip:text o son dilimi boyamadan bırakıyor ("e" kesik görünür).
     Kutu sağdan genişletilip aynı miktar negatif margin ile geri alınıyor. */
  padding-right: .08em;
  margin-right: -.08em;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }

/* ---- Geri sayım / odometre ---- */
.countdown {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 64px;
  max-width: 560px;
}
.countdown__box {
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--edge);
  border-radius: var(--r-card);
  padding: 20px 8px 16px;
  text-align: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.countdown__box b {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(28px, 3.8vw, 42px);
  line-height: 1;
  letter-spacing: -.05em;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}
/* Yalnızca doğrudan çocuk olan etiket span'i. `.odo` da bir span olduğu için
   burada `>` şart: aksi halde bu kural odometrenin font boyutunu eziyor. */
.countdown__box > span {
  display: block;
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-top: 12px;
}

.odo { display: inline-flex; justify-content: center; gap: 1px; }
.odo__digit { position: relative; height: 1em; width: .58em; overflow: hidden; }
.odo__strip { display: block; will-change: transform; }
.odo__strip i { display: block; height: 1em; line-height: 1; font-style: normal; }

@media (max-width: 560px) {
  /* Sayaç mobilde de tek şerit: 4 sütun, daraltılmış kutu ve etiket. */
  .countdown { grid-template-columns: repeat(4, 1fr); max-width: none; gap: 8px; margin-top: 48px; }
  .countdown__box { padding: 14px 4px 12px; border-radius: 12px; }
  .countdown__box b { font-size: clamp(21px, 6.2vw, 30px); }
  .countdown__box > span { font-size: 9px; letter-spacing: .08em; margin-top: 8px; }
  .hero { padding-block: 128px 76px; }
  .hero__cta .btn { width: 100%; justify-content: center; }
}

/* ============================================================
   KÜNYE
   ============================================================ */
.facts { padding-block: 0; margin-top: -38px; z-index: 2; }
.facts__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.fact {
  background: rgba(14, 23, 32, .78);
  border: 1px solid var(--edge);
  border-radius: var(--r-card);
  padding: 26px 24px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.fact span {
  display: block; font-size: 10.5px; letter-spacing: .17em;
  text-transform: uppercase; color: var(--fg-3);
}
.fact b {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600; font-size: 22px; letter-spacing: -.03em;
  color: var(--fg); margin-top: 10px;
}
.fact small { display: block; font-size: 14px; color: var(--fg-3); margin-top: 6px; }
@media (max-width: 900px) { .facts__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .facts__grid { grid-template-columns: 1fr; } }

/* ============================================================
   TAGLINE BANNER — Go Cloud, Go DevOps, Go AI
   ============================================================ */
.tagline {
  padding-block: clamp(76px, 10vw, 150px);
  overflow: hidden;
  text-align: center;
}
.tagline::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(46% 60% at 30% 50%, rgba(40, 141, 189, .22), transparent 70%),
    radial-gradient(38% 55% at 76% 52%, rgba(255, 153, 0, .13), transparent 72%);
  pointer-events: none;
}
.tagline__line {
  position: relative;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 .3em;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(32px, 7.6vw, 96px);
  line-height: 1.04;
  letter-spacing: -.05em;
  color: var(--fg);
}
.tagline__word { display: inline-block; }
.tagline__word--ai { color: var(--aws-orange); }
html:not(.js-off) .tagline__word { opacity: 0; }

/* ============================================================
   ŞERİT
   ============================================================ */
.marquee {
  padding-block: 22px;
  border-block: 1px solid var(--edge);
  overflow: hidden;
  background: linear-gradient(90deg, rgba(38, 85, 120, .18), transparent 50%, rgba(38, 85, 120, .18));
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
/* İki özdeş set: -50%'ye kayınca dikiş görünmez. Tek set olsaydı her turda sıçrardı. */
.marquee__track {
  display: flex;
  width: max-content;
  animation: marquee 52s linear infinite;
}
.marquee__set { display: flex; align-items: center; gap: 26px; padding-right: 26px; }
.marquee__set span {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: -.035em;
  color: rgba(255, 255, 255, .30);
  white-space: nowrap;
}
.marquee__set i { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); flex: none; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ============================================================
   HAKKINDA
   ============================================================ */
.about__inner { display: grid; grid-template-columns: .85fr 1.15fr; gap: 64px; }
.about__head { position: sticky; top: 130px; align-self: start; }
.prose p { color: var(--fg-2); font-size: 18px; }
@media (max-width: 900px) {
  .about__inner { grid-template-columns: 1fr; gap: 28px; }
  .about__head { position: static; }
}

/* ============================================================
   TEMALAR — pinlenmiş sahne
   ============================================================ */
.themes { padding-block: var(--section-py); }
.themes__grid { display: grid; grid-template-columns: 1fr; gap: 44px; }
.themes__sub { color: var(--fg-2); font-size: 18px; max-width: 460px; }

.themes__rail { list-style: none; padding: 0; margin: 36px 0 0; display: none; }
.themes__rail li {
  display: flex; gap: 14px; align-items: baseline;
  padding: 11px 0;
  font-family: var(--font-heading);
  font-weight: 600; font-size: 17px; letter-spacing: -.025em;
  color: rgba(255, 255, 255, .30);
  border-top: 1px solid var(--edge);
  transition: color 320ms var(--ease), padding-left 320ms var(--ease);
}
.themes__rail li span { font-size: 12px; letter-spacing: .08em; color: rgba(255, 255, 255, .22); transition: color 320ms var(--ease); }
.themes__rail li.is-active { color: var(--fg); padding-left: 12px; }
.themes__rail li.is-active span { color: var(--accent-lite); }

.themes__stack { display: grid; gap: 18px; }

.theme-panel {
  position: relative;
  background: linear-gradient(150deg, rgba(38, 85, 120, .22), var(--surface));
  border: 1px solid var(--edge);
  border-radius: var(--r-block);
  padding: 38px 36px 34px;
  overflow: hidden;
}
.theme-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 50%), rgba(143, 212, 239, .10), transparent 70%);
  opacity: var(--mo, 0);
  transition: opacity 320ms var(--ease);
  pointer-events: none;
}
.theme-panel > * { position: relative; }
.theme-panel__index {
  position: absolute;
  right: 24px; top: 6px;
  font-family: var(--font-heading);
  font-weight: 600; font-size: 110px; line-height: 1; letter-spacing: -.06em;
  color: rgba(255, 255, 255, .05);
  pointer-events: none;
}
.theme-panel img {
  width: 56px; height: 56px; margin-bottom: 22px;
  filter: brightness(1.5) saturate(.95);
}
.theme-panel h3 { margin-bottom: 14px; max-width: 22ch; }
.theme-panel p { color: var(--fg-2); font-size: 17px; margin-bottom: 18px; max-width: 52ch; }
.theme-panel a { font-size: 15.5px; font-weight: 600; }

/* Masaüstü + motion açık: sticky sahne */
@media (min-width: 901px) and (prefers-reduced-motion: no-preference) {
  .themes { height: 520vh; padding-block: 0; }
  .themes__pin {
    position: sticky; top: 0;
    height: 100vh;
    display: flex; align-items: center;
    overflow: hidden;
  }
  .themes__grid { grid-template-columns: .92fr 1.08fr; gap: 72px; align-items: center; }
  .themes__rail { display: block; }
  .themes__stack { position: relative; min-height: 460px; display: block; }
  .theme-panel {
    position: absolute; inset: 0;
    opacity: 0;
    transform: translateY(48px) scale(.97);
    pointer-events: none;
    transition: opacity 520ms var(--ease), transform 520ms var(--ease);
  }
  .theme-panel.is-active { opacity: 1; transform: none; pointer-events: auto; }
  /* JS çalışmazsa hepsi normal akışta görünsün */
  .js-off .themes { height: auto; padding-block: var(--section-py); }
  .js-off .themes__pin { position: static; height: auto; }
  .js-off .themes__stack { position: static; display: grid; }
  .js-off .theme-panel { position: relative; opacity: 1; transform: none; pointer-events: auto; }
}

/* ============================================================
   SPONSOR
   ============================================================ */
.sponsor { overflow: hidden; }
.sponsor::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(58% 68% at 50% 50%, rgba(38, 85, 120, .30), transparent 70%);
  pointer-events: none;
}
.sponsor__type {
  position: absolute;
  left: 0; right: 0; top: 6%;
  display: grid;
  pointer-events: none;
  user-select: none;
}
.sponsor__type span {
  grid-area: 1 / 1;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(80px, 17vw, 250px);
  line-height: .85;
  letter-spacing: -.06em;
  text-align: center;
  white-space: nowrap;
}
.sponsor__type-outline {
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, .09);
}
.sponsor__type-fill {
  background: linear-gradient(95deg, #5FC3EA, #288DBD 48%, #A8E0F5);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: .30;
  clip-path: inset(0 100% 0 0);
}
.js-off .sponsor__type-fill { clip-path: inset(0 0 0 0); }

.sponsor__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 60px;
  align-items: center;
  padding-top: 60px;
}
.sponsor__text p { font-size: 18px; }
.sponsor__text .btn { margin-top: 12px; }
.sponsor__badge {
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--edge);
  border-radius: var(--r-block);
  padding: 30px 26px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.sponsor__badge-panel {
  background: #fff;
  border-radius: var(--r-card);
  padding: 16px;
  margin-bottom: 22px;
}
.sponsor__badge-panel img { width: 100%; max-width: 320px; height: auto; margin: 0 auto; }
.sponsor__badge p { font-size: 14px; color: var(--fg-3); line-height: 1.6; }
@media (max-width: 900px) {
  .sponsor__inner { grid-template-columns: 1fr; gap: 36px; padding-top: 40px; }
  .sponsor__badge { max-width: 360px; margin-inline: auto; min-width: 0; }
}

/* ============================================================
   KİMLER KATILMALI
   ============================================================ */
.audience__list {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 26px 40px; list-style: none; padding: 0; margin: 0;
}
.audience__list li { border-left: 2px solid var(--blue); padding: 2px 0 2px 22px; color: var(--fg-2); }
.audience__list b {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600; font-size: 19px; letter-spacing: -.025em;
  color: var(--fg); margin-bottom: 6px;
}
@media (max-width: 700px) { .audience__list { grid-template-columns: 1fr; gap: 22px; } }

/* ============================================================
   MEKAN
   ============================================================ */
.venue { overflow: hidden; padding-bottom: calc(var(--section-py) + 20px); }
.venue__skyline { position: absolute; left: 0; right: 0; bottom: 0; height: 44%; pointer-events: none; }
/* -14%/128% pay: parallax kaydırması kenarı asla açığa çıkarmasın. */
.venue__skyline svg {
  position: absolute;
  left: -14%;
  width: 128%;
  max-width: none; /* global `svg { max-width: 100% }` kuralını ez, yoksa parallax kenarı açığa çıkar */
  bottom: 0;
  will-change: transform;
}
.venue__sky-back { height: 82%; fill: rgba(143, 212, 239, .13); }
.venue__sky-front { height: 56%; fill: #050A0E; }

.venue__inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; align-items: center;
}
.venue__text p { font-size: 17px; }
.venue__text .btn { margin-top: 12px; }
.venue__card {
  background: linear-gradient(150deg, rgba(38, 85, 120, .40), rgba(11, 18, 26, .85));
  border: 1px solid var(--edge);
  border-radius: var(--r-block);
  padding: 34px 32px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.venue__time { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.venue__time span {
  font-family: var(--font-heading);
  font-weight: 600; font-size: clamp(26px, 3vw, 34px);
  letter-spacing: -.04em; color: var(--fg);
}
.venue__time i { flex: 1; height: 1px; background: linear-gradient(90deg, var(--accent-lite), rgba(143, 212, 239, .15)); }
.venue__card p { font-size: 15.5px; color: var(--fg-2); margin: 0; }
@media (max-width: 900px) { .venue__inner { grid-template-columns: 1fr; gap: 32px; } }

/* ============================================================
   KAYIT BANDI
   ============================================================ */
.cta-band__inner {
  position: relative;
  overflow: hidden;
  text-align: center;
  border-radius: var(--r-block);
  padding: 92px 40px;
  background: linear-gradient(118deg, var(--blue-deep), var(--blue-dark) 52%, var(--blue));
}
.cta-band__glow {
  position: absolute;
  inset: -60%;
  background: conic-gradient(from 0deg, transparent 0deg, rgba(255, 255, 255, .26) 60deg, transparent 140deg, rgba(143, 212, 239, .22) 240deg, transparent 320deg);
  animation: ctaSpin 18s linear infinite;
  pointer-events: none;
}
@keyframes ctaSpin { to { transform: rotate(360deg); } }
.cta-band__inner > *:not(.cta-band__glow) { position: relative; z-index: 1; }
.cta-band h2 { margin-bottom: 18px; }
.cta-band p { color: rgba(255, 255, 255, .86); max-width: 560px; margin: 0 auto 34px; font-size: 18px; }
.cta-band .btn--primary { background: #fff; color: #0A1219; }
.cta-band .btn--primary:hover { box-shadow: 0 14px 44px rgba(0, 0, 0, .34); }
@media (max-width: 600px) { .cta-band__inner { padding: 58px 24px; } }

/* ============================================================
   SSS
   ============================================================ */
.faq__list { display: grid; gap: 12px; max-width: 880px; margin-inline: auto; }
.faq__item {
  background: var(--surface);
  border: 1px solid var(--edge);
  border-radius: var(--r-card);
  padding: 22px 26px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.faq__item[open], .faq__item:hover { border-color: rgba(143, 212, 239, .34); background: var(--surface-hi); }
.faq__item summary {
  cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: flex-start; gap: 22px;
  font-family: var(--font-heading);
  font-weight: 600; font-size: 18px; letter-spacing: -.025em; color: var(--fg);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+"; flex: none; color: var(--accent-lite);
  font-size: 24px; line-height: 1; transition: transform 220ms var(--ease);
}
.faq__item[open] summary::after { transform: rotate(45deg); }
.faq__item p { margin: 14px 0 0; color: var(--fg-2); font-size: 16.5px; }

/* ============================================================
   İLETİŞİM
   ============================================================ */
.contact__inner { display: grid; grid-template-columns: 1fr 1.05fr; gap: 64px; align-items: start; }
.contact__intro p { font-size: 18px; }
.contact__direct { list-style: none; padding: 0; margin: 32px 0 0; display: grid; gap: 18px; }
.contact__direct li { border-top: 1px solid var(--edge); padding-top: 16px; }
.contact__direct span {
  display: block; font-size: 10.5px; letter-spacing: .17em;
  text-transform: uppercase; color: var(--fg-3); margin-bottom: 5px;
}
.contact__direct a { font-family: var(--font-heading); font-weight: 600; font-size: 18px; letter-spacing: -.02em; }

.contact__form {
  background: var(--surface);
  border: 1px solid var(--edge);
  border-radius: var(--r-block);
  padding: 36px 34px;
  display: grid;
  gap: 18px;
}
.field { display: grid; gap: 8px; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--fg-2); }
.field input, .field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 16px; color: var(--fg);
  background: rgba(255, 255, 255, .04);
  border: 1px solid var(--edge);
  border-radius: var(--r-input);
  padding: 13px 15px;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--accent-lite); background: rgba(255, 255, 255, .07);
}
.field input:user-invalid, .field textarea:user-invalid { border-color: #D8756A; }

.consent {
  display: flex; align-items: flex-start; gap: 11px;
  font-size: 14px; color: var(--fg-3); line-height: 1.5; cursor: pointer;
}
.consent input { margin-top: 3px; accent-color: var(--blue); flex: none; }

.hp { position: absolute; left: -9999px; opacity: 0; }

.contact__form .btn { justify-content: center; }
.form-status { margin: 0; font-size: 14.5px; min-height: 1.2em; color: var(--fg-3); }
.form-status.is-ok { color: #6FD79E; }
.form-status.is-error { color: #E58C82; }

@media (max-width: 900px) { .contact__inner { grid-template-columns: 1fr; gap: 40px; } }
@media (max-width: 520px) { .contact__form { padding: 28px 22px; } }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { background: var(--ink-2); border-top: 1px solid var(--edge); padding-block: 64px 32px; }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 48px; }
.footer__brand img { width: 160px; height: auto; margin-bottom: 20px; }
.footer__brand p { font-size: 15px; color: var(--fg-3); max-width: 380px; }
.footer__back { font-weight: 600; }
.footer h3 { font-size: 15px; letter-spacing: -.01em; margin-bottom: 14px; }
.footer p { font-size: 15px; margin-bottom: 12px; }
.footer small { color: var(--fg-3); font-size: 13.5px; line-height: 1.6; }
.footer__social { list-style: none; padding: 0; margin: 14px 0 0; display: flex; gap: 18px; }
.footer__social a { font-size: 15px; }
.footer__base { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--edge); }
@media (max-width: 780px) { .footer__grid { grid-template-columns: 1fr; gap: 32px; } }

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .hero__spotlight, .hero__canvas { display: none; }
  .hero__go-line { opacity: 1 !important; transform: none !important; }
  .marquee__track { animation: none; width: auto; justify-content: center; }
  .marquee__set + .marquee__set { display: none; }
  .marquee__set { flex-wrap: wrap; justify-content: center; }
  .tagline__word { opacity: 1 !important; }
  .cta-band__glow { animation: none; }
  .sponsor__type-fill { clip-path: inset(0 0 0 0); }
  .theme-panel { opacity: 1 !important; transform: none !important; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .12s !important;
  }
}

/* ============================================================
   LIGHT TEMA
   Aynı yapı, açık zemin. `<html data-theme="light">` ile açılır.
   Yalnızca renk katmanı değişir — ölçek, boşluk ve hareket aynı kalır.
   ============================================================ */
:root {
  /* Ağ canvas'ı rengini JS buradan okur, böylece tema ile birlikte değişir. */
  --net-rgb: 143, 212, 239;
  --net-dot-rgb: 159, 220, 243;
  --net-alpha: .30;
  --net-dot-alpha: .62;
}

[data-theme="light"] {
  --ink: #FFFFFF;
  --ink-2: #F2F5FF;
  --surface: #FFFFFF;
  --surface-hi: #F7F9FF;
  --edge: #EBEBEB;
  --edge-hi: #D6DDE4;

  --fg: #283742;
  --fg-2: rgba(40, 55, 66, .95);
  --fg-3: rgba(40, 55, 66, .62);

  /* Açık zeminde #8FD4EF okunmaz; eyebrow ve linkler koyu maviye iner. */
  --accent-lite: #2779A4;

  --net-rgb: 40, 141, 189;
  --net-dot-rgb: 38, 85, 120;
  --net-alpha: .26;
  --net-dot-alpha: .5;

  color-scheme: light;
}

[data-theme="light"] a:hover { color: var(--blue-deep); }

/* Kartlar: koyu temada saydam yüzey, açıkta beyaz + hairline + yumuşak gölge */
[data-theme="light"] .fact,
[data-theme="light"] .countdown__box,
[data-theme="light"] .faq__item,
[data-theme="light"] .contact__form,
[data-theme="light"] .sponsor__badge,
[data-theme="light"] .theme-panel,
[data-theme="light"] .venue__card {
  background: #FFFFFF;
  border-color: var(--edge);
  box-shadow: 0 3px 6px rgba(0, 0, 0, .06);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
[data-theme="light"] .theme-panel:hover,
[data-theme="light"] .faq__item:hover,
[data-theme="light"] .faq__item[open] {
  background: #FFFFFF;
  border-color: rgba(40, 141, 189, .45);
  box-shadow: 0 4px 15px rgba(0, 0, 0, .10);
}
[data-theme="light"] .theme-panel::before {
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 50%), rgba(40, 141, 189, .07), transparent 70%);
}
[data-theme="light"] .theme-panel__index { color: rgba(40, 55, 66, .06); }

/* Butonlar: design system'deki düz mavi + beyaz metin */
[data-theme="light"] .btn--primary { background: var(--blue); color: #FFFFFF; }
[data-theme="light"] .btn--primary:hover { background: var(--blue-hover); color: #FFFFFF; }
[data-theme="light"] .btn--ghost { border-color: rgba(40, 55, 66, .22); color: var(--fg); }
[data-theme="light"] .btn--ghost:hover { background: var(--ink-2); border-color: var(--blue); }

/* Nav */
[data-theme="light"] .nav--stuck { background: rgba(255, 255, 255, .88); }

/* Hero katmanları */
[data-theme="light"] .hero__layer--aurora {
  background:
    radial-gradient(42% 44% at 14% 22%, rgba(40, 141, 189, .16), transparent 62%),
    radial-gradient(48% 50% at 86% 74%, rgba(38, 85, 120, .12), transparent 60%),
    radial-gradient(34% 36% at 62% 6%, rgba(143, 212, 239, .18), transparent 66%);
}
[data-theme="light"] .hero__layer--grid {
  background-image:
    linear-gradient(rgba(40, 55, 66, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(40, 55, 66, .07) 1px, transparent 1px);
}
[data-theme="light"] .hero__vignette {
  background:
    radial-gradient(120% 90% at 50% 45%, transparent 45%, rgba(255, 255, 255, .8) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, .6) 0%, transparent 22%, transparent 70%, #FFFFFF 100%);
}
[data-theme="light"] .hero__spotlight {
  background: radial-gradient(circle, rgba(40, 141, 189, .10), transparent 60%);
}
/* `background` kısayolu kullanılmıyor: shorthand `background-clip` değerini
   başlangıca (border-box) sıfırlar ve gradyan harflerin yerine tüm kutuyu
   boyar. Yalnızca görüntü katmanı değiştiriliyor. */
[data-theme="light"] .hero h1 em {
  background-image: linear-gradient(95deg, #288DBD, #265578 60%, #2779A4);
}
[data-theme="light"] .hero__go-line { -webkit-text-stroke-color: rgba(40, 141, 189, .55); }

/* Şerit ve tema rayı */
[data-theme="light"] .marquee {
  background: linear-gradient(90deg, rgba(40, 141, 189, .07), transparent 50%, rgba(40, 141, 189, .07));
}
[data-theme="light"] .marquee__set span { color: rgba(40, 55, 66, .28); }
[data-theme="light"] .themes__rail li { color: rgba(40, 55, 66, .40); border-top-color: var(--edge); }
[data-theme="light"] .themes__rail li span { color: rgba(40, 55, 66, .32); }
[data-theme="light"] .themes__rail li.is-active { color: var(--fg); }
[data-theme="light"] .themes__rail li.is-active span { color: var(--blue); }

/* Sponsor */
[data-theme="light"] .sponsor::before {
  background: radial-gradient(58% 68% at 50% 50%, rgba(40, 141, 189, .10), transparent 70%);
}
[data-theme="light"] .sponsor__type-outline { -webkit-text-stroke: 1px rgba(40, 55, 66, .13); }
[data-theme="light"] .sponsor__type-fill { opacity: .22; }
[data-theme="light"] .sponsor__badge-panel { background: var(--ink-2); }

/* Mekan */
[data-theme="light"] .venue__sky-back { fill: rgba(40, 141, 189, .10); }
[data-theme="light"] .venue__sky-front { fill: #E6ECF5; }
[data-theme="light"] .venue__time i {
  background: linear-gradient(90deg, var(--blue), rgba(40, 141, 189, .15));
}

/* Form */
[data-theme="light"] .field input,
[data-theme="light"] .field textarea {
  background: var(--ink-2);
  border-color: var(--edge);
  color: var(--fg);
}
[data-theme="light"] .field input:focus,
[data-theme="light"] .field textarea:focus {
  background: #FFFFFF;
  border-color: var(--blue);
}

/* Footer */
[data-theme="light"] .footer { background: var(--ink-2); border-top-color: var(--edge); }

/* Kayıt bandı koyu mavi kalıyor: sayfadaki tek yüksek kontrast alan,
   dönüşüm için bilinçli olarak korunuyor. */

/* Kayıt bandı açık temada da koyu mavi kalıyor; üzerindeki metin ve buton
   sayfa token'larını değil bandın kendi kontrastını kullanmalı.
   (Base `.cta-band .btn--primary` kuralı 0,2,0 özgüllükte kaldığı için
   `[data-theme="light"] .btn--primary` onu eziyordu — burada geri alınıyor.) */
[data-theme="light"] .cta-band h2 { color: #FFFFFF; }
[data-theme="light"] .cta-band .btn--primary { background: #FFFFFF; color: #0A1219; }
[data-theme="light"] .cta-band .btn--primary:hover {
  background: #FFFFFF;
  color: #0A1219;
  box-shadow: 0 14px 44px rgba(0, 0, 0, .3);
}