:root {
  --ink: #0b1a1d;
  --ink-soft: #173034;
  --paper: #f4f1e9;
  --paper-deep: #e9e5db;
  --white: #fffef9;
  --teal: #0d7f82;
  --teal-light: #72b8b2;
  --coral: #dc765f;
  --gold: #c9a45d;
  --line: rgba(11, 26, 29, .14);
  --shadow: 0 24px 70px rgba(11, 26, 29, .11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "DM Sans", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
button, input { font: inherit; }
button { color: inherit; }
img { max-width: 100%; }
[hidden] { display: none !important; }

.skip-link { position: fixed; z-index: 100; left: 1rem; top: 1rem; transform: translateY(-180%); padding: .75rem 1rem; color: white; background: var(--ink); border-radius: 999px; }
.skip-link:focus { transform: none; }
.site-header { min-height: 84px; padding: 1.1rem max(5vw, 1.25rem); display: flex; align-items: center; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--line); }
.brand { text-decoration: none; display: grid; }
.brand-name { font: 800 1.08rem/1.2 "Manrope", sans-serif; letter-spacing: -.03em; }
.brand-detail { margin-top: .24rem; color: rgba(11, 26, 29, .58); font-size: .68rem; letter-spacing: .13em; text-transform: uppercase; }
.hub-link { text-decoration: none; font-size: .8rem; font-weight: 700; letter-spacing: .05em; border-bottom: 1px solid var(--ink); padding-bottom: .2rem; }

.library-view, .detail-view { width: min(1240px, 90vw); margin: 0 auto; }
.hero { min-height: 520px; padding: 7.5rem 0 6rem; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4rem; position: relative; }
.eyebrow { margin: 0 0 1.5rem; display: flex; align-items: center; gap: .65rem; color: var(--teal); font-size: .71rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow > span { width: 30px; height: 1px; background: currentColor; }
.hero h1 { margin: 0; max-width: 850px; font: 800 clamp(4rem, 9.4vw, 8.2rem)/.83 "Manrope", sans-serif; letter-spacing: -.075em; }
.hero h1 small { display: block; margin-bottom: .22em; color: var(--teal); font-size: .24em; line-height: 1; letter-spacing: .2em; }
.hero-lead { margin: 2.2rem 0 0; max-width: 610px; font-size: clamp(1.25rem, 2vw, 1.65rem); line-height: 1.45; letter-spacing: -.025em; }
.hero-meta { margin-top: 2.5rem; display: flex; align-items: center; gap: 1rem; color: rgba(11, 26, 29, .6); font-size: .77rem; letter-spacing: .09em; text-transform: uppercase; }
.hero-meta strong { color: var(--ink); font-size: 1rem; }
.hero-meta i { width: 3px; height: 3px; border-radius: 50%; background: var(--coral); }
.hero-mark { width: min(27vw, 300px); aspect-ratio: 1; border: 1px solid var(--line); border-radius: 50%; display: grid; place-content: center; text-align: center; position: relative; }
.hero-mark::before { content: ""; position: absolute; inset: 11%; border-radius: 50%; border: 1px solid rgba(13, 127, 130, .35); }
.hero-mark span { font: 800 clamp(3rem, 7vw, 6rem)/.8 "Manrope", sans-serif; letter-spacing: -.08em; }
.hero-mark b { margin-top: .65rem; font: 700 .72rem/1 "Manrope", sans-serif; letter-spacing: .3em; }
.hero-mark i { position: absolute; width: 12px; height: 12px; border-radius: 50%; background: var(--coral); top: 13%; right: 19%; box-shadow: 0 0 0 9px rgba(220, 118, 95, .13); }

.explore-tools { padding: 1.15rem; color: white; background: var(--ink); display: grid; grid-template-columns: 1fr auto; gap: 1rem; border-radius: 4px; box-shadow: var(--shadow); }
.search-field { min-height: 64px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem; padding: 0 1.1rem; background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .12); }
.search-field > span { color: var(--teal-light); font-size: .68rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.search-field input { min-width: 0; color: white; background: transparent; border: 0; outline: 0; font-size: 1rem; }
.search-field input::placeholder { color: rgba(255, 255, 255, .5); }
.search-field:focus-within { border-color: var(--teal-light); }
kbd { padding: .25rem .42rem; color: rgba(255,255,255,.55); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.13); border-radius: 3px; font-size: .65rem; }
.random-button, .lesson-aside button { border: 0; background: var(--teal); color: white; padding: 0 1.5rem; font-weight: 700; cursor: pointer; transition: background .2s, transform .2s; }
.random-button:hover, .lesson-aside button:hover { background: #0a6f72; }
.random-button:active, .lesson-aside button:active { transform: scale(.98); }

.library-bar { padding: 2.8rem 0 1.5rem; display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: end; }
.filters { display: flex; flex-wrap: wrap; gap: .55rem; }
.filters button { padding: .72rem .9rem; border: 1px solid var(--line); border-radius: 999px; background: transparent; font-size: .76rem; font-weight: 700; cursor: pointer; transition: .2s; }
.filters button:hover { border-color: var(--teal); color: var(--teal); }
.filters button.active { color: white; background: var(--ink); border-color: var(--ink); }
.progress-line { margin: 0; min-width: 180px; color: rgba(11, 26, 29, .6); font-size: .72rem; text-align: right; }
.progress-line > i { margin-top: .65rem; height: 2px; display: block; background: rgba(11, 26, 29, .12); overflow: hidden; }
.progress-line > i b { display: block; width: 0; height: 100%; background: var(--teal); transition: width .5s ease; }
.results-heading { padding: 2rem 0 1.3rem; display: flex; justify-content: space-between; align-items: baseline; border-top: 1px solid var(--line); }
.results-heading h2 { margin: 0; font: 700 clamp(1.7rem, 3vw, 2.6rem)/1.1 "Manrope", sans-serif; letter-spacing: -.045em; }
.results-heading span { color: rgba(11, 26, 29, .48); font-size: .75rem; }
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.topic-card { min-width: 0; display: grid; grid-template-rows: 260px 1fr; text-decoration: none; background: rgba(255,255,255,.3); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; transition: background .25s, transform .25s, box-shadow .25s; }
.topic-card:hover { z-index: 2; background: var(--white); transform: translateY(-3px); box-shadow: var(--shadow); }
.card-atlas { position: relative; overflow: hidden; background: #e6e1d6; }
.card-atlas::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(11,26,29,.17), transparent 50%); pointer-events: none; }
.card-atlas img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.86) contrast(1.03); transform: scale(1.015); transition: transform .5s ease; }
.topic-card:hover img { transform: scale(1.055); }
.topic-card-copy { min-height: 180px; padding: 1.55rem; display: flex; flex-direction: column; }
.topic-card-copy small { color: var(--teal); font-size: .65rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.topic-card-copy > strong { margin-top: .8rem; font: 700 clamp(1.28rem, 2vw, 1.58rem)/1.15 "Manrope", sans-serif; letter-spacing: -.035em; }
.topic-card-copy > span { margin-top: auto; padding-top: 1.5rem; display: flex; justify-content: space-between; color: rgba(11,26,29,.6); font-size: .75rem; font-weight: 600; }
.topic-card-copy b { color: var(--ink); font-size: 1rem; transition: transform .2s; }
.topic-card:hover .topic-card-copy b { transform: translateX(4px); }
.topic-card.visited .topic-card-copy::after { content: "KEŞFEDİLDİ"; margin-top: .7rem; color: var(--teal); font-size: .59rem; font-weight: 700; letter-spacing: .16em; }
.empty-state { padding: 5rem 1rem; text-align: center; border-top: 1px solid var(--line); }
.empty-state strong { display: block; font: 700 1.4rem/1.3 "Manrope", sans-serif; }
.empty-state button { margin-top: 1rem; border: 0; border-bottom: 1px solid var(--ink); background: transparent; cursor: pointer; }

.breadcrumb { padding: 2rem 0; display: flex; gap: .55rem; flex-wrap: wrap; color: rgba(11,26,29,.52); font-size: .68rem; }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--teal); }
.breadcrumb b { color: var(--ink); }
.detail-hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(340px, .92fr); min-height: 690px; align-items: center; background: var(--ink); color: white; }
.atlas-wrap { width: 100%; aspect-ratio: 1; position: relative; overflow: hidden; background: #d9d4ca; }
.atlas-wrap::after { content: ""; position: absolute; inset: 0; box-shadow: inset -40px 0 80px rgba(11,26,29,.13); pointer-events: none; }
.atlas-wrap img { width: 100%; height: 100%; display: block; object-fit: cover; filter: saturate(.9) contrast(1.02); }
.atlas-note { position: absolute; z-index: 3; left: 1.3rem; bottom: 1.2rem; padding: .45rem .65rem; color: white; background: rgba(11,26,29,.72); backdrop-filter: blur(8px); font-size: .61rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.focus-point { display: none; }
.focus-point::before { content: ""; width: 58px; height: 58px; border: 1px solid white; border-radius: 50%; transform: translate(-50%, -50%); position: absolute; box-shadow: 0 0 0 12px rgba(220,118,95,.32); }
.focus-point i { width: 9px; height: 9px; border-radius: 50%; background: var(--coral); transform: translate(-50%, -50%); box-shadow: 0 0 0 4px white; }
.focus-point b { margin-left: 2.7rem; padding: .55rem .72rem; white-space: nowrap; background: var(--ink); color: white; font-size: .66rem; font-weight: 700; letter-spacing: .04em; }
.detail-intro { padding: clamp(3rem, 6vw, 6.5rem); display: flex; flex-direction: column; justify-content: center; }
.detail-intro .eyebrow { color: var(--teal-light); }
.detail-intro h1 { margin: 0; font: 800 clamp(3.2rem, 6.2vw, 6.4rem)/.94 "Manrope", sans-serif; letter-spacing: -.065em; overflow-wrap: anywhere; }
.reading-time { margin: 2rem 0 0; color: rgba(255,255,255,.62); font-size: .78rem; }
.detail-progress { margin: .55rem 0 0; color: var(--teal-light); font-size: .72rem; }
.back-link { width: fit-content; margin-top: 3rem; padding-bottom: .3rem; text-decoration: none; font-size: .75rem; font-weight: 700; border-bottom: 1px solid rgba(255,255,255,.45); }
.lesson-layout { padding: 7rem 0; display: grid; grid-template-columns: minmax(0, 2fr) minmax(240px, .72fr); gap: clamp(3rem, 7vw, 8rem); }
.lesson-block { padding: 0 0 3rem; margin-bottom: 3rem; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: minmax(150px, .5fr) minmax(0, 1.5fr); gap: 2rem; }
.lesson-block > div { display: flex; gap: .8rem; align-items: baseline; }
.lesson-block span { color: var(--coral); font: 700 .68rem/1 "Manrope", sans-serif; letter-spacing: .09em; }
.lesson-block h2 { margin: 0; font: 700 .77rem/1.2 "Manrope", sans-serif; letter-spacing: .12em; }
.lesson-block p { margin: -.3rem 0 0; font-size: clamp(1.08rem, 1.8vw, 1.32rem); line-height: 1.65; letter-spacing: -.015em; }
.lesson-aside { height: fit-content; padding: 2rem; position: sticky; top: 1rem; border-top: 3px solid var(--teal); background: var(--paper-deep); }
.lesson-aside > p { margin: 0; color: var(--teal); font-size: .62rem; font-weight: 700; letter-spacing: .15em; }
.lesson-aside > strong { margin-top: 1rem; display: block; font: 700 1.45rem/1.25 "Manrope", sans-serif; letter-spacing: -.035em; }
.lesson-aside button { width: 100%; min-height: 50px; margin-top: 2rem; font-size: .72rem; }
.related { padding: 5rem 0; border-top: 1px solid var(--line); }
.related h2 { margin: 0 0 2.5rem; font: 700 clamp(2.1rem, 4vw, 3.5rem)/1.05 "Manrope", sans-serif; letter-spacing: -.055em; }
.related-links { display: grid; grid-template-columns: repeat(2, 1fr); }
.related-links a { min-height: 170px; padding: 1.8rem; display: grid; grid-template-columns: 1fr auto; align-content: space-between; gap: .6rem 1rem; text-decoration: none; border: 1px solid var(--line); background: rgba(255,255,255,.25); transition: .2s; }
.related-links a + a { border-left: 0; }
.related-links a:hover { background: var(--white); }
.related-links small { grid-column: 1 / -1; color: var(--teal); font-size: .62rem; font-weight: 700; letter-spacing: .13em; }
.related-links strong { max-width: 390px; font: 700 1.22rem/1.3 "Manrope", sans-serif; }
.related-links span { font-size: 1.2rem; transition: transform .2s; }
.related-links a:hover span { transform: translateX(4px); }
.topic-navigation { display: grid; grid-template-columns: 1fr 1fr; margin-bottom: 6rem; color: white; background: var(--ink); }
.topic-navigation a { min-height: 190px; padding: 2rem; display: grid; grid-template-columns: 1fr auto; align-items: end; gap: .7rem 1rem; text-decoration: none; }
.topic-navigation a + a { border-left: 1px solid rgba(255,255,255,.14); }
.topic-navigation small { grid-column: 1 / -1; align-self: start; color: var(--teal-light); font-size: .61rem; letter-spacing: .17em; }
.topic-navigation strong { font: 700 clamp(1.2rem, 2.5vw, 1.8rem)/1.15 "Manrope", sans-serif; letter-spacing: -.035em; }
.topic-navigation span { font-size: 1.4rem; }

footer { width: min(1240px, 90vw); margin: 0 auto; padding: 2.5rem 0 3rem; display: grid; grid-template-columns: .85fr 1.6fr auto; gap: 2rem; border-top: 1px solid var(--line); color: rgba(11,26,29,.58); font-size: .69rem; line-height: 1.55; }
footer div { display: grid; align-content: start; }
footer strong { color: var(--ink); font-size: .78rem; }
footer p { margin: 0; }

:focus-visible { outline: 2px solid var(--coral); outline-offset: 4px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; } }

@media (max-width: 900px) {
  .hero { min-height: 460px; padding: 5.5rem 0 4.5rem; }
  .hero-mark { width: 210px; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-hero { grid-template-columns: 1fr; }
  .atlas-wrap { min-height: 0; max-height: none; }
  .detail-intro { padding: 4rem 8vw; }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-aside { position: static; }
  footer { grid-template-columns: 1fr 1.4fr; }
  footer > span { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .site-header { min-height: 72px; }
  .brand-detail { font-size: .58rem; }
  .hub-link { font-size: .69rem; }
  .library-view, .detail-view, footer { width: min(92vw, 560px); }
  .hero { min-height: auto; padding: 5rem 0 3.5rem; grid-template-columns: 1fr; }
  .hero h1 { font-size: clamp(3.45rem, 18vw, 5.8rem); }
  .hero-mark { display: none; }
  .hero-meta { gap: .65rem; font-size: .62rem; }
  .hero-meta strong { font-size: .8rem; }
  .explore-tools { grid-template-columns: 1fr; padding: .75rem; }
  .search-field { min-height: 60px; }
  .search-field kbd { display: none; }
  .random-button { min-height: 52px; }
  .library-bar { grid-template-columns: 1fr; padding-top: 2rem; gap: 1.3rem; }
  .filters { flex-wrap: nowrap; overflow-x: auto; padding-bottom: .3rem; scrollbar-width: none; }
  .filters::-webkit-scrollbar { display: none; }
  .filters button { flex: 0 0 auto; }
  .progress-line { text-align: left; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { grid-template-columns: 42% 58%; grid-template-rows: 190px; }
  .topic-card-copy { min-height: 0; padding: 1.25rem; }
  .topic-card-copy > strong { font-size: 1.2rem; }
  .topic-card-copy > span { padding-top: 1rem; }
  .atlas-wrap { min-height: 0; }
  .focus-point b { max-width: 145px; white-space: normal; }
  .detail-intro { padding: 3.5rem 1.5rem; }
  .detail-intro h1 { font-size: clamp(2.9rem, 15vw, 4.7rem); }
  .lesson-layout { padding: 4.5rem 0; }
  .lesson-block { grid-template-columns: 1fr; gap: 1.3rem; padding-bottom: 2.3rem; margin-bottom: 2.3rem; }
  .lesson-block p { margin: 0; font-size: 1.05rem; }
  .related { padding: 4rem 0; }
  .related-links { grid-template-columns: 1fr; }
  .related-links a + a { border-left: 1px solid var(--line); border-top: 0; }
  .topic-navigation { grid-template-columns: 1fr; }
  .topic-navigation a { min-height: 145px; }
  .topic-navigation a + a { border-left: 0; border-top: 1px solid rgba(255,255,255,.14); }
  footer { grid-template-columns: 1fr; }
  footer > span { grid-column: auto; }
}