/* ATDEdu · Aşama 1 — temel arayüz stilleri */
:root {
  color-scheme: dark;
  --color-bg: #090909;
  --color-surface: #101010;
  --color-surface-raised: #151515;
  --color-surface-soft: #1a1a1a;
  --color-text: #f4f4f2;
  --color-text-soft: #c7c7c4;
  --color-muted: #92928f;
  --color-faint: #666663;
  --color-border: #282826;
  --color-border-strong: #3b3b38;
  --color-white: #fff;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --container: 1220px;
  --header-height: 76px;
  --ease-out: cubic-bezier(.2, .7, .2, 1);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 18px);
  background: var(--color-bg);
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(ellipse 55% 35% at 4% 5%, rgba(255, 255, 255, .035), transparent 72%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: #e9e9e7; color: #111; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
svg { display: block; }
.icon-library { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.65; stroke-linecap: round; stroke-linejoin: round; flex: 0 0 auto; }
.container { width: min(var(--container), calc(100% - 64px)); margin-inline: auto; }

:focus-visible { outline: 2px solid #f4f4f2; outline-offset: 4px; }
.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 11px 15px;
  transform: translateY(-160%);
  border: 1px solid var(--color-border-strong);
  border-radius: 9px;
  background: var(--color-text);
  color: #101010;
  font-size: 14px;
  font-weight: 650;
  transition: transform .2s var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

/* Header and navigation */
.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, .075);
  background: rgba(9, 9, 9, .88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.header-inner {
  display: grid;
  min-height: var(--header-height);
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 30px;
}
.brand { display: inline-flex; width: fit-content; align-items: center; gap: 10px; }
.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid #444440;
  border-radius: 11px;
  background: linear-gradient(145deg, #252523, #111);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
}
.brand-mark svg { width: 25px; height: 25px; fill: var(--color-text); }
.brand-word { font-size: 18px; font-weight: 720; letter-spacing: -.055em; }
.brand-word > span { color: #aaa; font-weight: 500; }
.primary-navigation { display: flex; align-items: center; gap: clamp(20px, 2.6vw, 36px); }
.primary-navigation a,
.footer-navigation a {
  color: #a5a5a1;
  font-size: 13px;
  font-weight: 520;
  transition: color .2s ease;
}
.primary-navigation a:hover,
.footer-navigation a:hover { color: var(--color-text); }
.header-actions { display: flex; justify-content: flex-end; align-items: center; }
.header-cta {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 11px;
  padding: 0 14px;
  border: 1px solid #353532;
  border-radius: 8px;
  color: var(--color-text);
  font-size: 12px;
  font-weight: 620;
  transition: background .2s ease, border-color .2s ease, transform .2s var(--ease-out);
}
.header-cta:hover { transform: translateY(-1px); border-color: #60605b; background: #191918; }
.header-cta .icon { width: 15px; height: 15px; }
.menu-toggle { display: none; width: 42px; height: 42px; align-items: center; justify-content: center; border: 1px solid var(--color-border); border-radius: 10px; background: #131313; color: var(--color-text); cursor: pointer; }
.menu-toggle .icon { width: 21px; height: 21px; }
.menu-toggle__close { display: none; }
.menu-toggle[aria-expanded="true"] .menu-toggle__open { display: none; }
.menu-toggle[aria-expanded="true"] .menu-toggle__close { display: block; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: clamp(74px, 9vw, 126px) 0 64px; }
.hero::before {
  position: absolute;
  top: -230px;
  right: -150px;
  width: 720px;
  height: 720px;
  border: 1px solid rgba(255,255,255,.025);
  border-radius: 50%;
  box-shadow: 0 0 0 72px rgba(255,255,255,.012), 0 0 0 145px rgba(255,255,255,.008);
  content: "";
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(400px, .97fr); align-items: center; gap: clamp(40px, 6vw, 84px); }
.hero-copy { position: relative; z-index: 1; max-width: 610px; padding: 8px 0 16px; }
.eyebrow { display: flex; align-items: center; gap: 9px; margin: 0 0 27px; color: #aaa; font-size: 10px; font-weight: 650; letter-spacing: .15em; line-height: 1.4; }
.eyebrow-dot { width: 7px; height: 7px; border-radius: 50%; background: #eee; box-shadow: 0 0 12px rgba(255,255,255,.35); }
.eyebrow-divider { color: #535350; }
.hero h1 { max-width: 720px; margin: 0; font-size: clamp(58px, 7.1vw, 94px); font-weight: 560; letter-spacing: -.085em; line-height: .99; }
.hero h1 span,
.section-heading h2 span,
.updates-intro h2 span,
.closing-card h2 span { color: #777774; font-weight: 430; }
.hero-description { max-width: 490px; margin: 28px 0 0; color: #aaa9a5; font-size: clamp(15px, 1.4vw, 17px); line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 32px; }
.button { display: inline-flex; min-height: 49px; align-items: center; justify-content: center; gap: 14px; padding: 0 18px; border: 1px solid transparent; border-radius: 8px; font-size: 13px; font-weight: 650; transition: transform .22s var(--ease-out), background .22s ease, border-color .22s ease, color .22s ease; }
.button:hover { transform: translateY(-2px); }
.button .icon { width: 16px; height: 16px; }
.button--light { background: #f2f2f0; color: #101010; }
.button--light:hover { background: #d8d8d5; }
.button--quiet { border-color: #30302e; background: rgba(255,255,255,.015); color: #d4d4d1; }
.button--quiet:hover { border-color: #555551; background: rgba(255,255,255,.055); }
.hero-note { display: flex; align-items: center; gap: 12px; margin-top: 49px; }
.hero-note__line { width: 26px; height: 1px; background: #656562; }
.hero-note p { margin: 0; color: #777773; font-size: 11px; letter-spacing: .01em; }

.hero-visual { position: relative; z-index: 1; display: grid; min-height: 480px; place-items: center; }
.hero-dashboard {
  position: relative;
  width: min(100%, 535px);
  min-height: 420px;
  overflow: hidden;
  padding: 24px 26px 20px;
  border: 1px solid #343431;
  border-radius: 22px;
  background:
    radial-gradient(ellipse at 77% 43%, rgba(255,255,255,.065), transparent 37%),
    linear-gradient(138deg, #191918, #111110 62%, #0e0e0d);
  box-shadow: 0 38px 90px rgba(0,0,0,.48), inset 0 1px 0 rgba(255,255,255,.055);
  transform: rotate(.6deg);
}
.hero-dashboard::after { position: absolute; right: -70px; bottom: -118px; width: 260px; height: 260px; border: 1px solid rgba(255,255,255,.065); border-radius: 50%; box-shadow: 0 0 0 28px rgba(255,255,255,.018), 0 0 0 58px rgba(255,255,255,.012); content: ""; pointer-events: none; }
.dashboard-topline { position: relative; z-index: 1; display: flex; justify-content: space-between; align-items: center; padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.09); color: #a3a39f; font-size: 9px; font-weight: 680; letter-spacing: .12em; }
.dashboard-brand { display: inline-flex; align-items: center; gap: 8px; }
.dashboard-brand__mark { display: grid; width: 21px; height: 21px; place-items: center; border: 1px solid #474744; border-radius: 6px; color: #f4f4f2; font-size: 10px; letter-spacing: -.04em; }
.dashboard-topline__slash { color: #51514d; }
.dashboard-status { display: inline-flex; align-items: center; gap: 7px; color: #858581; font-size: 8px; }
.dashboard-status > span { width: 5px; height: 5px; border-radius: 50%; background: #bbb; box-shadow: 0 0 8px rgba(255,255,255,.34); }
.dashboard-main { position: relative; z-index: 1; display: flex; min-height: 280px; align-items: center; justify-content: space-between; gap: 12px; }
.dashboard-copy { position: relative; z-index: 2; width: 55%; padding-top: 2px; }
.dashboard-kicker { display: inline-block; margin-bottom: 16px; color: #858580; font-size: 8px; font-weight: 650; letter-spacing: .16em; }
.dashboard-copy p { margin: 0; font-size: clamp(24px, 3vw, 37px); font-weight: 480; letter-spacing: -.065em; line-height: 1.13; }
.dashboard-copy p strong { color: #858581; font-weight: 440; }
.dashboard-small-line { display: block; width: 38px; height: 2px; margin-top: 21px; background: #bababa; }
.orbit-graphic { position: relative; width: 200px; height: 200px; flex: 0 0 200px; margin-right: -7px; }
.orbit-ring { position: absolute; top: 50%; left: 50%; display: block; border: 1px solid rgba(255,255,255,.12); border-radius: 50%; transform: translate(-50%,-50%); }
.orbit-ring--outer { width: 188px; height: 188px; border-style: dashed; border-color: rgba(255,255,255,.13); animation: orbit-turn 48s linear infinite; }
.orbit-ring--middle { width: 144px; height: 144px; border-color: rgba(255,255,255,.15); }
.orbit-ring--inner { width: 98px; height: 98px; border-color: rgba(255,255,255,.23); }
.orbit-ring--outer::before { position: absolute; top: 27px; right: 24px; width: 7px; height: 7px; border-radius: 50%; background: #ddd; box-shadow: 0 0 12px rgba(255,255,255,.42); content: ""; }
.orbit-core { position: absolute; top: 50%; left: 50%; display: flex; width: 72px; height: 72px; align-items: center; justify-content: center; flex-direction: column; border: 1px solid rgba(255,255,255,.28); border-radius: 22px; background: linear-gradient(145deg,#282827,#111); box-shadow: 0 8px 30px rgba(0,0,0,.42), inset 0 1px 0 rgba(255,255,255,.1); transform: translate(-50%,-50%) rotate(-8deg); }
.orbit-core > span { font-size: 17px; font-weight: 740; letter-spacing: -.07em; }
.orbit-core small { margin-top: -2px; color: #949490; font-size: 5px; letter-spacing: .13em; }
.orbit-node { position: absolute; z-index: 2; display: grid; width: 27px; height: 27px; place-items: center; border: 1px solid #555551; border-radius: 9px; background: #1c1c1b; color: #e1e1de; font-size: 8px; font-weight: 650; box-shadow: 0 6px 15px rgba(0,0,0,.3); }
.orbit-node--one { top: 11px; left: 43px; }
.orbit-node--two { right: 2px; bottom: 51px; }
.orbit-node--three { bottom: 10px; left: 50px; color: #aaa; font-size: 12px; }
.dashboard-bottom { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(3, 1fr); padding-top: 16px; border-top: 1px solid rgba(255,255,255,.09); }
.dashboard-bottom > div { display: flex; flex-direction: column; gap: 4px; padding-left: 15px; border-left: 1px solid rgba(255,255,255,.09); }
.dashboard-bottom > div:first-child { padding-left: 0; border-left: 0; }
.dashboard-bottom strong { font-size: 18px; font-weight: 520; letter-spacing: -.04em; line-height: 1; }
.dashboard-bottom span { color: #777773; font-size: 7px; font-weight: 620; letter-spacing: .11em; }
.dashboard-corner { position: absolute; right: 24px; bottom: 9px; color: #555551; font-size: 7px; letter-spacing: .12em; }
.visual-caption { position: absolute; right: -7px; bottom: 14px; display: flex; align-items: center; gap: 10px; padding: 12px 15px; border: 1px solid #393936; border-radius: 11px; background: #171716; box-shadow: 0 16px 32px rgba(0,0,0,.4); transform: rotate(-2deg); }
.visual-caption__symbol { color: #ededeb; font-size: 21px; }
.visual-caption > span:last-child { color: #aaa9a5; font-size: 9px; line-height: 1.35; }
.hero-bottom-rule { position: relative; width: min(var(--container), calc(100% - 64px)); height: 1px; margin: 54px auto 0; background: linear-gradient(90deg, transparent, #30302e 12%, #30302e 88%, transparent); }
.hero-bottom-rule span { position: absolute; top: -2px; left: 12%; width: 5px; height: 5px; border-radius: 50%; background: #a4a4a0; }

/* Section headings and course cards */
.section { padding: 112px 0; }
.section-heading { margin-bottom: 42px; }
.section-heading--split { display: flex; align-items: end; justify-content: space-between; gap: 32px; }
.section-eyebrow { gap: 11px; margin-bottom: 18px; color: #8c8c88; }
.section-number { display: inline-grid; width: 25px; height: 25px; place-items: center; border: 1px solid #343431; border-radius: 7px; color: #d5d5d2; font-size: 9px; letter-spacing: 0; }
.section-heading h2,
.updates-intro h2 { margin: 0; font-size: clamp(38px, 5vw, 62px); font-weight: 510; letter-spacing: -.072em; line-height: 1.06; }
.section-description { max-width: 530px; margin: 17px 0 0; color: var(--color-muted); font-size: 14px; line-height: 1.75; }
.text-link { display: inline-flex; align-items: center; gap: 10px; padding: 0 0 7px; border-bottom: 1px solid #3c3c39; color: #d0d0cc; font-size: 12px; font-weight: 600; white-space: nowrap; transition: color .2s ease, border-color .2s ease; }
.text-link:hover { border-color: #aaa; color: #fff; }
.text-link .icon { width: 15px; height: 15px; }
.subjects-section { padding-top: 72px; }
.subjects-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.subject-card {
  display: flex;
  min-height: 185px;
  flex-direction: column;
  justify-content: space-between;
  padding: 19px 17px 17px;
  overflow: hidden;
  border: 1px solid #262624;
  border-radius: 12px;
  background: linear-gradient(145deg, rgba(255,255,255,.026), rgba(255,255,255,.006) 65%);
  transition: border-color .24s ease, background .24s ease, transform .24s var(--ease-out), box-shadow .24s ease;
}
.subject-card:hover { transform: translateY(-4px); border-color: #555551; background: linear-gradient(145deg, rgba(255,255,255,.07), rgba(255,255,255,.014) 70%); box-shadow: 0 16px 32px rgba(0,0,0,.22); }
.subject-card__top,.subject-card__bottom { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.subject-icon { display: grid; width: 37px; height: 37px; place-items: center; border: 1px solid #333330; border-radius: 10px; background: #171716; color: #d7d7d3; }
.subject-icon .icon { width: 19px; height: 19px; }
.subject-index { align-self: start; color: #666663; font-size: 9px; font-weight: 650; letter-spacing: .08em; }
.subject-card__bottom { align-items: end; }
.subject-card__bottom > span { min-width: 0; }
.subject-type { display: block; margin-bottom: 6px; color: #72726e; font-size: 8px; font-weight: 650; letter-spacing: .12em; }
.subject-card h3,.subject-card strong { display: block; margin: 0; color: #e7e7e4; font-size: clamp(14px, 1.3vw, 16px); font-weight: 570; letter-spacing: -.035em; line-height: 1.3; }
.subject-arrow { width: 16px; height: 16px; margin-bottom: 2px; color: #747470; transition: color .2s ease, transform .2s var(--ease-out); }
.subject-card:hover .subject-arrow { transform: translate(2px,-2px); color: #f0f0ee; }
.subjects-footnote { display: flex; align-items: center; gap: 8px; margin: 20px 0 0; color: #777773; font-size: 11px; }
.subjects-footnote .icon { width: 15px; height: 15px; color: #a4a4a0; }

/* Featured learning areas */
.learning-section { position: relative; overflow: hidden; border-top: 1px solid #1d1d1b; border-bottom: 1px solid #1d1d1b; background: #0d0d0c; }
.learning-section::before { position: absolute; top: 0; right: 7%; width: 430px; height: 430px; border: 1px solid rgba(255,255,255,.023); border-radius: 50%; box-shadow: 0 0 0 48px rgba(255,255,255,.01), 0 0 0 96px rgba(255,255,255,.006); content: ""; pointer-events: none; }
.learning-section .container { position: relative; }
.status-pill { display: inline-flex; align-items: center; gap: 9px; padding: 10px 13px; border: 1px solid #30302d; border-radius: 999px; color: #92928e; font-size: 9px; font-weight: 650; letter-spacing: .1em; white-space: nowrap; }
.status-pill__dot,.coming-soon > span { width: 6px; height: 6px; border-radius: 50%; background: #c8c8c4; box-shadow: 0 0 9px rgba(255,255,255,.18); }
.learning-grid { display: grid; grid-template-columns: 1.32fr 1fr 1fr; gap: 13px; }
.learning-card { position: relative; min-height: 316px; overflow: hidden; padding: 22px; border: 1px solid #2b2b28; border-radius: 15px; background: linear-gradient(145deg, #171716, #10100f 78%); }
.learning-card--featured { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 14px; padding: 25px 22px; background: radial-gradient(ellipse at 90% 50%, rgba(255,255,255,.055), transparent 43%), linear-gradient(145deg, #191918, #10100f 80%); }
.learning-card__content { position: relative; z-index: 1; display: flex; min-height: 265px; flex-direction: column; justify-content: space-between; }
.learning-card__meta { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.feature-label { color: #91918d; font-size: 8px; font-weight: 680; letter-spacing: .13em; }
.coming-soon { display: inline-flex; align-items: center; gap: 6px; color: #777773; font-size: 7px; font-weight: 680; letter-spacing: .12em; white-space: nowrap; }
.coming-soon > span { width: 5px; height: 5px; background: #777773; box-shadow: none; }
.learning-card__icon { display: grid; width: 39px; height: 39px; margin: 19px 0 13px; place-items: center; border: 1px solid #393936; border-radius: 11px; background: #1c1c1b; color: #dededb; }
.learning-card__icon .icon { width: 20px; height: 20px; }
.learning-card h3 { margin: 0; color: #ececea; font-size: 19px; font-weight: 570; letter-spacing: -.045em; line-height: 1.25; }
.learning-card p { max-width: 330px; margin: 10px 0 0; color: #92928e; font-size: 12px; line-height: 1.7; }
.learning-card__foot { display: flex; align-items: center; gap: 8px; margin-top: 18px; color: #777773; font-size: 8px; font-weight: 620; letter-spacing: .12em; }
.learning-card__foot > span { color: #494946; }
.lesson-preview { position: relative; width: 100%; max-width: 224px; justify-self: end; padding: 17px 14px 13px; border: 1px solid #343431; border-radius: 12px; background: rgba(9,9,9,.72); box-shadow: 0 20px 38px rgba(0,0,0,.32); transform: rotate(2deg); }
.lesson-preview::before { position: absolute; top: -13px; right: 24px; width: 55px; height: 25px; border: 1px solid #3c3c38; border-bottom: 0; border-radius: 7px 7px 0 0; background: #141413; content: ""; }
.lesson-preview__top { position: relative; display: flex; align-items: center; gap: 6px; padding-bottom: 13px; border-bottom: 1px solid #282826; color: #767672; font-size: 6px; font-weight: 690; letter-spacing: .12em; }
.lesson-preview__dot { width: 5px; height: 5px; border-radius: 50%; background: #c6c6c2; }
.lesson-preview__top-index { margin-left: auto; color: #5b5b57; }
.lesson-preview__row { display: flex; height: 47px; align-items: center; gap: 8px; border-bottom: 1px solid #20201e; }
.lesson-preview__number { color: #666662; font-size: 7px; }
.lesson-preview__line { display: block; height: 5px; border-radius: 8px; background: #41413e; }
.lesson-preview__line--long { width: 76px; }
.lesson-preview__line--medium { width: 58px; }
.lesson-preview__line--short { width: 42px; }
.lesson-preview__check { display: grid; width: 15px; height: 15px; margin-left: auto; place-items: center; border: 1px solid #3c3c38; border-radius: 50%; color: #777773; font-size: 11px; line-height: 1; }
.lesson-preview__footer { display: flex; justify-content: space-between; margin-top: 13px; color: #696965; font-size: 5px; font-weight: 650; letter-spacing: .13em; }
.learning-card--small { display: flex; flex-direction: column; }
.learning-card--small .learning-card__icon { margin-top: 25px; }
.learning-card--small p { max-width: 275px; }
.mini-stack { position: absolute; right: 20px; bottom: -14px; width: 95px; height: 78px; transform: rotate(-10deg); }
.mini-stack span { position: absolute; left: 0; width: 74px; height: 48px; border: 1px solid #3c3c38; border-radius: 8px; background: linear-gradient(145deg,#20201e,#121211); box-shadow: 0 7px 17px rgba(0,0,0,.26); }
.mini-stack span:nth-child(1) { top: 0; left: 12px; opacity: .5; }
.mini-stack span:nth-child(2) { top: 9px; left: 6px; opacity: .75; }
.mini-stack span:nth-child(3) { top: 18px; left: 0; }
.mini-stack span:nth-child(3)::before,.mini-stack span:nth-child(3)::after { position: absolute; left: 10px; width: 30px; height: 2px; background: #555551; content: ""; }
.mini-stack span:nth-child(3)::before { top: 14px; }
.mini-stack span:nth-child(3)::after { top: 22px; width: 48px; background: #383835; }
.practice-mark { position: absolute; right: 21px; bottom: 18px; display: flex; width: 86px; height: 51px; align-items: end; gap: 5px; }
.practice-mark span { display: grid; width: 29px; height: 38px; place-items: center; border: 1px solid #494945; border-radius: 8px; background: #1d1d1b; color: #aaa; font-size: 20px; font-weight: 430; }
.practice-mark i { display: block; width: 13px; height: 24px; border: 1px solid #353532; border-radius: 5px; background: #151514; }
.practice-mark i:nth-of-type(2) { height: 32px; }

/* Feature principles */
.features-section { padding-bottom: 120px; }
.features-section .section-heading { margin-bottom: 46px; }
.features-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid #2b2b28; border-bottom: 1px solid #2b2b28; }
.feature-item { min-height: 226px; padding: 24px 24px 22px; border-left: 1px solid #2b2b28; transition: background .2s ease; }
.feature-item:first-child { border-left: 0; padding-left: 0; }
.feature-item:hover { background: linear-gradient(180deg, rgba(255,255,255,.025), transparent); }
.feature-item__icon { display: grid; width: 38px; height: 38px; margin-bottom: 23px; place-items: center; border: 1px solid #333330; border-radius: 10px; color: #d4d4d0; }
.feature-item__icon .icon { width: 18px; height: 18px; }
.feature-item__number { color: #6f6f6b; font-size: 8px; font-weight: 670; letter-spacing: .14em; }
.feature-item h3 { margin: 9px 0 0; color: #e7e7e4; font-size: 16px; font-weight: 580; letter-spacing: -.035em; }
.feature-item p { max-width: 230px; margin: 9px 0 0; color: #8d8d89; font-size: 11px; line-height: 1.75; }

/* Recent additions */
.updates-section { border-top: 1px solid #1c1c1a; background: #0d0d0c; }
.updates-layout { display: grid; grid-template-columns: .78fr 1.22fr; align-items: start; gap: clamp(44px, 8vw, 110px); }
.updates-intro { position: sticky; top: calc(var(--header-height) + 36px); }
.updates-intro h2 { font-size: clamp(42px, 5.2vw, 64px); }
.updates-intro .text-link { margin-top: 27px; }
.updates-list { border-top: 1px solid #30302d; }
.update-item { display: grid; grid-template-columns: 42px minmax(0,1fr) 22px; align-items: start; gap: 15px; padding: 23px 0 25px; border-bottom: 1px solid #30302d; }
.update-item__symbol { display: grid; width: 38px; height: 38px; place-items: center; border: 1px solid #343431; border-radius: 10px; background: #151514; color: #c8c8c4; }
.update-item__symbol .icon { width: 18px; height: 18px; }
.update-item__body { min-width: 0; }
.update-item__meta { display: flex; align-items: center; gap: 10px; margin: 1px 0 9px; }
.update-tag { color: #b0b0ac; font-size: 8px; font-weight: 700; letter-spacing: .12em; }
.update-tag--muted { color: #797975; }
.update-item time { color: #6c6c68; font-size: 8px; font-weight: 600; letter-spacing: .08em; }
.update-item h3 { margin: 0; color: #e7e7e4; font-size: 16px; font-weight: 570; letter-spacing: -.03em; }
.update-item p { margin: 6px 0 0; color: #858581; font-size: 11px; line-height: 1.65; }
.update-item__arrow { display: grid; width: 22px; height: 22px; margin-top: 2px; place-items: center; color: #696965; }
.update-item__arrow .icon { width: 15px; height: 15px; }
.update-coming { color: #777773; font-size: 8px; font-weight: 670; letter-spacing: .1em; }
.update-item--upcoming .update-item__symbol { color: #8a8a86; border-style: dashed; background: transparent; }
.update-item--upcoming .update-item__arrow { opacity: .35; }

/* Closing callout and footer */
.closing-section { padding: 112px 0 105px; }
.closing-card { position: relative; min-height: 388px; overflow: hidden; padding: clamp(34px, 6vw, 66px); border: 1px solid #333330; border-radius: 18px; background: radial-gradient(ellipse at 78% 52%, rgba(255,255,255,.075), transparent 39%), linear-gradient(125deg,#191918,#10100f 67%); }
.closing-card__texture { position: absolute; top: -140px; right: 3%; width: 520px; height: 520px; border: 1px solid rgba(255,255,255,.08); border-radius: 50%; box-shadow: 0 0 0 42px rgba(255,255,255,.018), 0 0 0 86px rgba(255,255,255,.012), 0 0 0 132px rgba(255,255,255,.008); pointer-events: none; }
.closing-card__content { position: relative; z-index: 1; max-width: 545px; }
.closing-card .eyebrow { margin-bottom: 21px; }
.closing-card h2 { margin: 0; font-size: clamp(45px, 6.2vw, 72px); font-weight: 520; letter-spacing: -.075em; line-height: .99; }
.closing-card__content > p:not(.eyebrow) { max-width: 430px; margin: 19px 0 24px; color: #9d9d99; font-size: 13px; line-height: 1.75; }
.closing-card__mark { position: absolute; right: 11%; top: 50%; display: flex; width: 194px; height: 194px; align-items: center; justify-content: center; flex-direction: column; border: 1px solid rgba(255,255,255,.14); border-radius: 48px; background: linear-gradient(145deg,rgba(255,255,255,.075),rgba(0,0,0,.18)); box-shadow: 0 20px 65px rgba(0,0,0,.3), inset 0 1px 0 rgba(255,255,255,.1); transform: translateY(-50%) rotate(9deg); }
.closing-card__mark::before,.closing-card__mark::after { position: absolute; inset: -17px; border: 1px solid rgba(255,255,255,.11); border-radius: 58px; content: ""; }
.closing-card__mark::after { inset: -36px; border-color: rgba(255,255,255,.055); border-radius: 68px; }
.closing-card__mark > span { font-size: 46px; font-weight: 760; letter-spacing: -.1em; }
.closing-card__mark i { margin-top: -4px; color: #a4a4a0; font-size: 8px; font-style: normal; font-weight: 650; letter-spacing: .2em; line-height: 1.6; text-align: center; }
.site-footer { border-top: 1px solid #242422; background: #080808; }
.footer-main { display: grid; grid-template-columns: 1.15fr .9fr 1.4fr auto; align-items: center; gap: 28px; min-height: 132px; }
.brand--footer .brand-mark { width: 33px; height: 33px; }
.brand--footer .brand-word { font-size: 16px; }
.footer-note { margin: 0; color: #797975; font-size: 10px; line-height: 1.55; }
.footer-navigation { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px 21px; }
.footer-navigation a { font-size: 10px; }
.back-to-top { display: inline-flex; align-items: center; gap: 8px; color: #a5a5a1; font-size: 10px; white-space: nowrap; transition: color .2s ease; }
.back-to-top:hover { color: #fff; }
.back-to-top .icon { width: 14px; height: 14px; }
.footer-bottom { display: flex; min-height: 54px; align-items: center; justify-content: space-between; gap: 20px; border-top: 1px solid #20201e; color: #666662; font-size: 9px; }
.footer-stage { display: inline-flex; align-items: center; gap: 7px; font-size: 8px; font-weight: 650; letter-spacing: .12em; }
.footer-stage i { width: 3px; height: 3px; border-radius: 50%; background: #777773; }

/* Responsive layouts */
@media (max-width: 1080px) {
  .container { width: min(var(--container), calc(100% - 52px)); }
  .header-inner { gap: 20px; }
  .primary-navigation { gap: 20px; }
  .hero-grid { grid-template-columns: minmax(0,1fr) minmax(350px,.92fr); gap: 36px; }
  .hero-dashboard { min-height: 395px; padding-inline: 20px; }
  .dashboard-main { min-height: 255px; }
  .orbit-graphic { width: 174px; height: 174px; flex-basis: 174px; }
  .orbit-ring--outer { width: 164px; height: 164px; }
  .orbit-ring--middle { width: 128px; height: 128px; }
  .orbit-ring--inner { width: 88px; height: 88px; }
  .orbit-node--one { top: 9px; left: 37px; }
  .orbit-node--two { right: 0; bottom: 43px; }
  .orbit-node--three { bottom: 7px; left: 42px; }
  .subjects-grid { grid-template-columns: repeat(4,minmax(0,1fr)); }
  .learning-grid { grid-template-columns: 1.2fr 1fr 1fr; }
  .learning-card--featured { grid-template-columns: 1fr; }
  .lesson-preview { display: none; }
  .learning-card__content { min-height: 265px; }
  .footer-main { grid-template-columns: 1fr .8fr 1.3fr auto; gap: 18px; }
}

@media (max-width: 820px) {
  :root { --header-height: 70px; }
  .header-inner { display: flex; min-height: var(--header-height); flex-wrap: wrap; justify-content: space-between; gap: 0 18px; }
  .brand { margin-right: auto; }
  .header-actions { order: 2; margin-left: auto; }
  .primary-navigation { order: 3; width: 100%; align-items: stretch; flex-direction: column; gap: 0; padding: 8px 0 14px; }
  .primary-navigation a { padding: 12px 4px; border-top: 1px solid rgba(255,255,255,.055); font-size: 14px; }
  .primary-navigation a:first-child { border-top: 0; }
  .menu-toggle { display: none; }
  .js .menu-toggle { display: inline-flex; }
  .js .primary-navigation { display: none; }
  .js .primary-navigation.is-open { display: flex; }
  .hero { padding-top: 75px; }
  .hero-grid { grid-template-columns: minmax(0,1fr); gap: 38px; }
  .hero-copy { max-width: 680px; }
  .hero h1 { font-size: clamp(64px, 10vw, 88px); }
  .hero-visual { min-height: 440px; }
  .hero-dashboard { width: min(100%, 590px); min-height: 414px; }
  .dashboard-main { min-height: 270px; }
  .orbit-graphic { width: 200px; height: 200px; flex-basis: 200px; }
  .orbit-ring--outer { width: 188px; height: 188px; }
  .orbit-ring--middle { width: 144px; height: 144px; }
  .orbit-ring--inner { width: 98px; height: 98px; }
  .orbit-node--one { top: 11px; left: 43px; }
  .orbit-node--two { right: 2px; bottom: 51px; }
  .orbit-node--three { bottom: 10px; left: 50px; }
  .section { padding: 88px 0; }
  .subjects-section { padding-top: 65px; }
  .subjects-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .learning-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .learning-card--featured { grid-column: 1 / -1; grid-template-columns: 1.05fr .95fr; }
  .lesson-preview { display: block; }
  .features-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .feature-item:nth-child(3) { border-left: 0; border-top: 1px solid #2b2b28; padding-left: 0; }
  .feature-item:nth-child(4) { border-top: 1px solid #2b2b28; }
  .updates-layout { grid-template-columns: 1fr; gap: 40px; }
  .updates-intro { position: static; }
  .updates-intro h2 br { display: none; }
  .closing-card__mark { right: 7%; width: 156px; height: 156px; }
  .closing-card__mark > span { font-size: 38px; }
  .footer-main { grid-template-columns: 1fr 1fr; padding-block: 30px; }
  .footer-note { justify-self: end; }
  .footer-navigation { justify-content: flex-start; }
  .back-to-top { justify-self: end; }
}

@media (max-width: 600px) {
  .container { width: min(var(--container), calc(100% - 40px)); }
  .header-cta { display: none; }
  .hero { padding: 62px 0 50px; }
  .hero::before { top: -60px; right: -390px; }
  .hero-grid { gap: 26px; }
  .eyebrow { gap: 7px; font-size: 8px; letter-spacing: .12em; }
  .hero h1 { font-size: clamp(53px, 13.5vw, 78px); }
  .hero-description { margin-top: 21px; font-size: 14px; }
  .hero-actions { gap: 9px; margin-top: 25px; }
  .button { min-height: 46px; gap: 10px; padding-inline: 14px; font-size: 12px; }
  .hero-note { margin-top: 31px; }
  .hero-note p { font-size: 9px; }
  .hero-visual { min-height: 345px; }
  .hero-dashboard { min-height: 340px; padding: 17px 16px 16px; border-radius: 17px; }
  .dashboard-topline { padding-bottom: 13px; font-size: 7px; }
  .dashboard-brand__mark { width: 18px; height: 18px; font-size: 9px; }
  .dashboard-status { font-size: 6px; }
  .dashboard-main { min-height: 226px; gap: 0; }
  .dashboard-copy { width: 54%; }
  .dashboard-kicker { max-width: 140px; margin-bottom: 11px; font-size: 6px; }
  .dashboard-copy p { font-size: clamp(20px, 6vw, 29px); }
  .dashboard-small-line { margin-top: 14px; }
  .orbit-graphic { width: 152px; height: 152px; flex-basis: 152px; margin-right: -9px; }
  .orbit-ring--outer { width: 145px; height: 145px; }
  .orbit-ring--middle { width: 112px; height: 112px; }
  .orbit-ring--inner { width: 77px; height: 77px; }
  .orbit-ring--outer::before { top: 21px; right: 19px; width: 6px; height: 6px; }
  .orbit-core { width: 61px; height: 61px; border-radius: 18px; }
  .orbit-core > span { font-size: 14px; }
  .orbit-node { width: 23px; height: 23px; border-radius: 7px; font-size: 7px; }
  .orbit-node--one { top: 7px; left: 32px; }
  .orbit-node--two { right: -1px; bottom: 37px; }
  .orbit-node--three { bottom: 5px; left: 37px; font-size: 10px; }
  .dashboard-bottom { padding-top: 12px; }
  .dashboard-bottom > div { gap: 3px; padding-left: 9px; }
  .dashboard-bottom strong { font-size: 15px; }
  .dashboard-bottom span { font-size: 6px; letter-spacing: .08em; }
  .dashboard-corner { right: 15px; bottom: 5px; font-size: 6px; }
  .visual-caption { right: -5px; bottom: 0; gap: 7px; padding: 9px 11px; }
  .visual-caption__symbol { font-size: 17px; }
  .visual-caption > span:last-child { font-size: 8px; }
  .hero-bottom-rule { width: calc(100% - 40px); margin-top: 35px; }
  .section { padding: 72px 0; }
  .subjects-section { padding-top: 53px; }
  .section-heading--split { align-items: flex-start; flex-direction: column; gap: 20px; }
  .section-heading { margin-bottom: 30px; }
  .section-heading h2,.updates-intro h2 { font-size: clamp(38px, 10vw, 52px); }
  .section-description { margin-top: 13px; font-size: 12px; }
  .subjects-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 9px; }
  .subject-card { min-height: 159px; padding: 14px 12px 13px; border-radius: 10px; }
  .subject-icon { width: 33px; height: 33px; border-radius: 9px; }
  .subject-index { font-size: 8px; }
  .subject-type { margin-bottom: 5px; font-size: 7px; }
  .subject-card h3,.subject-card strong { font-size: 13px; }
  .subject-arrow { width: 14px; height: 14px; }
  .subjects-footnote { align-items: flex-start; font-size: 10px; line-height: 1.5; }
  .status-pill { align-self: flex-start; font-size: 8px; }
  .learning-grid { grid-template-columns: minmax(0,1fr); gap: 10px; }
  .learning-card { min-height: 275px; padding: 19px; }
  .learning-card--featured { grid-column: auto; grid-template-columns: 1fr; min-height: 330px; }
  .learning-card__content { min-height: 285px; }
  .lesson-preview { position: absolute; right: 18px; bottom: 25px; width: 42%; max-width: 190px; padding: 12px 9px 9px; opacity: .8; transform: rotate(3deg) scale(.9); transform-origin: right bottom; }
  .lesson-preview__row { height: 39px; }
  .learning-card--featured .learning-card__content > div:nth-child(2) { max-width: 58%; }
  .learning-card--featured .learning-card__content > div:nth-child(2) p { font-size: 11px; }
  .learning-card__foot { margin-top: 12px; font-size: 7px; }
  .learning-card--small { min-height: 250px; }
  .learning-card--small p { max-width: 75%; }
  .features-section .section-heading { margin-bottom: 31px; }
  .features-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .feature-item { min-height: 205px; padding: 18px 12px 17px; }
  .feature-item:first-child,.feature-item:nth-child(3) { padding-left: 0; }
  .feature-item:nth-child(2),.feature-item:nth-child(4) { padding-right: 0; padding-left: 16px; }
  .feature-item__icon { width: 34px; height: 34px; margin-bottom: 17px; }
  .feature-item__number { font-size: 7px; }
  .feature-item h3 { font-size: 14px; }
  .feature-item p { font-size: 10px; }
  .updates-layout { gap: 28px; }
  .update-item { grid-template-columns: 34px minmax(0,1fr) 18px; gap: 11px; padding: 19px 0; }
  .update-item__symbol { width: 32px; height: 32px; border-radius: 8px; }
  .update-item__symbol .icon { width: 16px; height: 16px; }
  .update-item h3 { font-size: 14px; }
  .update-item p { font-size: 10px; }
  .update-item__meta { flex-wrap: wrap; gap: 7px; }
  .closing-section { padding: 72px 0; }
  .closing-card { min-height: 390px; padding: 32px 24px; border-radius: 15px; }
  .closing-card h2 { font-size: clamp(42px, 11vw, 57px); }
  .closing-card__content > p:not(.eyebrow) { max-width: 340px; font-size: 11px; }
  .closing-card__mark { right: 8%; top: auto; bottom: 22px; width: 94px; height: 94px; border-radius: 25px; transform: rotate(9deg); opacity: .78; }
  .closing-card__mark::before { inset: -9px; border-radius: 31px; }
  .closing-card__mark::after { inset: -19px; border-radius: 39px; }
  .closing-card__mark > span { font-size: 25px; }
  .closing-card__mark i { font-size: 5px; }
  .footer-main { grid-template-columns: 1fr auto; gap: 18px 10px; padding-block: 27px; }
  .footer-note { display: none; }
  .footer-navigation { grid-column: 1 / -1; justify-content: flex-start; gap: 12px 17px; }
  .footer-navigation a { font-size: 9px; }
  .back-to-top { grid-column: 2; grid-row: 1; }
  .footer-bottom { min-height: 50px; flex-wrap: wrap; justify-content: space-between; gap: 5px 14px; padding-block: 12px; font-size: 8px; }
  .footer-bottom > span:nth-child(2) { display: none; }
  .footer-stage { font-size: 7px; }
}

@media (max-width: 360px) {
  .container { width: calc(100% - 32px); }
  .hero h1 { font-size: 52px; }
  .hero-visual { min-height: 320px; }
  .hero-dashboard { min-height: 324px; padding-inline: 12px; }
  .dashboard-main { min-height: 216px; }
  .orbit-graphic { width: 130px; height: 130px; flex-basis: 130px; }
  .orbit-ring--outer { width: 126px; height: 126px; }
  .orbit-ring--middle { width: 98px; height: 98px; }
  .orbit-ring--inner { width: 69px; height: 69px; }
  .orbit-node--one { top: 3px; left: 25px; }
  .orbit-node--two { right: -2px; bottom: 30px; }
  .orbit-node--three { bottom: 0; left: 28px; }
  .dashboard-copy p { font-size: 19px; }
  .dashboard-bottom span { font-size: 5px; }
  .subject-card { min-height: 151px; padding-inline: 10px; }
  .subject-card h3,.subject-card strong { font-size: 12px; }
  .lesson-preview { right: 12px; width: 40%; }
  .learning-card--featured .learning-card__content > div:nth-child(2) { max-width: 62%; }
  .feature-item__number { letter-spacing: .08em; }
  .closing-card { padding-inline: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@keyframes orbit-turn { to { transform: translate(-50%,-50%) rotate(360deg); } }

/* Aşama 7 · Renk ve neon vurguları assets/css/neon-theme.css dosyasında toplanır. */
@media (prefers-reduced-motion: reduce) {
 html { scroll-behavior: auto; }
 *, *::before, *::after { animation: none !important; transition: none !important; }
}
/* Dar ekranlarda mevcut ana sayfa içeriğinin yatay taşmasını önle. */
.updates-layout > * { min-width: 0; }
@media (max-width: 360px) { .hero h1 { font-size: 48px; } .updates-intro h2 { overflow-wrap: anywhere; } .update-item__arrow { width: 18px; } }