* {box-sizing:border-box}
html,body {height:100%}
body {
  margin:0;background:var(--ydt-bg);color:var(--ydt-text);
  font-family:"Segoe UI",Arial,sans-serif;
  display:flex;flex-direction:column;min-height:100vh;
}
.ydt-hidden {display:none !important}

/* ---- top bar ---- */
.ydt-top {
  display:flex;align-items:center;gap:14px;
  padding:10px 22px;border-bottom:1px solid var(--ydt-border);
  background:var(--ydt-panel);flex:0 0 auto;
}
.ydt-top-title {font-size:1rem;font-weight:600;color:var(--ydt-accent);flex:1 1 auto}
.ydt-count {font-size:.9rem;color:var(--ydt-dim);font-variant-numeric:tabular-nums}
.ydt-topbtn {
  background:transparent;border:1px solid var(--ydt-border);color:var(--ydt-text);
  border-radius:8px;padding:6px 12px;font-size:.85rem;cursor:pointer;
  text-decoration:none;line-height:1.2;
}
.ydt-topbtn:hover {border-color:var(--ydt-accent);color:var(--ydt-accent)}
.ydt-progress {height:3px;background:rgba(255,255,255,.06);flex:0 0 auto}
.ydt-progress-fill {height:100%;background:var(--ydt-accent);width:0;transition:width .18s ease}

/* ---- title header panel (standart, kaynak: lexitest) ---- */
.header-wrap {
  display:flex;justify-content:center;align-items:center;
  width:100%;max-width:1200px;margin:20px auto 0;
  padding:var(--ydt-gap);min-height:80px;
  background:var(--ydt-panel);
  border:1px solid var(--ydt-border);
  border-radius:14px;
  backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);
  box-sizing:border-box;
}
.logo-container {display:flex;flex-direction:column;align-items:center;gap:8px;width:100%}
.title-img {display:block;max-width:240px;width:100%;height:auto;object-fit:contain}

/* ---- deck / slides ---- */
.ydt-deck {
  flex:1 1 auto;display:flex;flex-direction:column;
  padding:clamp(14px,2.2vh,32px) clamp(20px,4vw,70px);
  overflow:hidden;
  justify-content:center;align-items:center;
}
.ydt-slide {
  display:flex;flex-direction:column;gap:var(--ydt-gap);
  width:100%;max-width:min(2400px,94vw);
  flex:0 0 auto;               /* KRITIK: shrink olursa icerik sikisir ve tasar */
  align-self:center;
  transform-origin:center center;
  will-change:transform;
}
.ydt-slide h1 {
  margin:0;font-size:clamp(1.7rem,min(3.4vw,5.2vh),3rem);line-height:1.15;
  color:var(--ydt-accent);font-weight:700;
}
.ydt-slide h2 {
  margin:0;font-size:clamp(1.25rem,min(2.4vw,3.6vh),2.2rem);line-height:1.2;
  color:var(--ydt-accent);font-weight:700;
}
.ydt-slide h3 {
  margin:0;font-size:clamp(1rem,min(1.5vw,2.3vh),1.4rem);color:var(--ydt-key);font-weight:600;
}
.ydt-slide p,.ydt-slide li,.ydt-slide td,.ydt-slide th {
  font-size:clamp(.95rem,min(1.4vw,2.15vh),1.45rem);line-height:1.45;
}
.ydt-sub {color:var(--ydt-dim);font-size:clamp(.95rem,min(1.35vw,2vh),1.35rem) !important}
.ydt-slide ul,.ydt-slide ol {margin:0;padding-left:1.4em;display:flex;flex-direction:column;gap:10px}

/* ---- content blocks ---- */
.ydt-block {
  background:var(--ydt-panel);border:1px solid var(--ydt-border);
  border-radius:12px;padding:clamp(14px,1.6vw,24px);
  display:flex;flex-direction:column;gap:12px;
}
.ydt-cols {display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:var(--ydt-gap)}
.ydt-cols-3 {display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--ydt-gap)}

/* ---- responsive: tablet / telefon ----
   Dar ekranda cok sutunlu yerlesim slaydi asiri uzatir; tek sutuna dusuruyoruz.
   Ayrica cok kucuk ekranda fitSlide olcegi okunamayacak kadar dusebilir; o durumda
   lesson-shared.js deck'e .is-scrollable ekler ve dikey kaydirmaya izin verilir. */
@media (max-width:1024px) {
  .ydt-cols,.ydt-cols-3{grid-template-columns:1fr}
  .ydt-deck{padding:clamp(10px,1.8vh,20px) clamp(12px,3vw,28px)}
  .ydt-slide{max-width:100%;--ydt-gap:12px}
}
@media (max-width:640px){
  .ydt-slide h1{font-size:clamp(1.35rem,6vw,2rem)}
  .ydt-slide h2{font-size:clamp(1.15rem,5vw,1.7rem)}
  .ydt-slide p,.ydt-slide li,.ydt-slide td,.ydt-slide th{font-size:clamp(.9rem,3.6vw,1.1rem)}
  .ydt-deck{padding:10px 12px}
  .ydt-slide{--ydt-gap:10px}
  .ydt-table{font-size:.85em}
}
/* Okunamayacak kadar kucultmek yerine kaydirmaya izin ver (yalniz kucuk ekranlarda) */
.ydt-deck.is-scrollable {
  overflow-y:auto;justify-content:flex-start;
  -webkit-overflow-scrolling:touch;
}
.ydt-deck.is-scrollable .ydt-slide {transform:none !important}

/* ---- KUCUK EKRAN: kucultme yok, ASAGI kaydirma var ----
   (a) telefon/tablet DIKEY  (b) telefon YATAY (yukseklik <=500px)
   Dar ya da alcak ekranda olcek 0.2-0.3'e dusuyor ve satirlar birbirine
   giriyordu. Burada olcek hic uygulanmaz (JS isSmallScreen); her sey tek
   sutuna dizilir, yatay tasma yapan bilesenler (tablo, sik satiri,
   formul seridi) sarilir ya da kendi icinde kaydirilir. */
@media (max-width:820px) and (orientation:portrait),
       (max-height:500px) and (orientation:landscape) {
  .ydt-deck{
    overflow-y:auto;justify-content:flex-start;align-items:stretch;
    padding:14px 14px 28px;
  }
  .ydt-slide{
    max-width:100%;--ydt-gap:14px;
    transform:none !important;
  }
  /* okunabilir taban boyutlar - vw ile kuculmesin */
  .ydt-slide h1{font-size:1.5rem;line-height:1.25}
  .ydt-slide h2{font-size:1.25rem;line-height:1.3}
  .ydt-slide h3{font-size:1.05rem}
  .ydt-slide p,.ydt-slide li{font-size:1rem;line-height:1.55}
  .ydt-sub{font-size:.95rem !important}

  /* tablolar: hucreler ust uste binmesin, gerekirse yatay kaydirilsin */
  .ydt-table,.ydt-slide table{display:block;width:100%;overflow-x:auto;white-space:nowrap}
  .ydt-slide td,.ydt-slide th{font-size:.92rem;padding:8px 10px}

  /* sik satirlari ve serit bilesenler alt alta sarsin */
  .opts,.ydt-formula,.ydt-chips{flex-wrap:wrap;white-space:normal;line-height:1.7}
  .opts{display:flex;flex-direction:column;gap:6px}

  /* iki sutunlu bloklar tek sutun. min-width:0 SART: grid item varsayilani
     auto'dur ve icindeki genis tablo sutunu disari tasirir */
  .ydt-cols,.ydt-cols-3{grid-template-columns:minmax(0,1fr);gap:14px}
  .ydt-cols>*,.ydt-cols-3>*{min-width:0}
  .ydt-slide>*{max-width:100%}

  /* uzun ingilizce kelimeler tasmasin */
  .ydt-slide p,.ydt-slide li,.ydt-slide td,.passage,.dlg,.stem{overflow-wrap:anywhere}

  /* parca ve diyalog bloklari nefes alsin */
  .passage,.dlg{line-height:1.8;padding:12px 14px}
}

/* Telefon YATAY: ekran genis ama alcak. Tek sutuna zorlamak yer israfi olur;
   iki sutuna izin ver, dikeyde kaydir. Puntolar biraz daha kucuk. */
@media (max-height:500px) and (orientation:landscape) {
  .ydt-cols{grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr))}
  .ydt-cols-3{grid-template-columns:repeat(auto-fit,minmax(min(220px,100%),1fr))}
  .ydt-slide h1{font-size:1.3rem}
  .ydt-slide h2{font-size:1.12rem}
  .ydt-slide p,.ydt-slide li{font-size:.95rem;line-height:1.5}
  .ydt-slide{--ydt-gap:10px}
  .ydt-deck{padding:10px 16px 22px}
  .passage,.dlg{line-height:1.65}
}

/* ---- TABLET YATAY (1024x768 ve benzeri) ----
   Burada olcek 0.44-0.75 arasi cikiyordu ve yazi okunmuyordu. JS bu sinifi
   isSmallScreen sayip kaydirmaya aliyor; burada da SABIT okunabilir puntolar
   veriyoruz. Iki sutun korunur (ekran yeterince genis), sadece yukseklik
   kaydirilir. */
@media (min-width:821px) and (max-width:1200px) and (max-height:850px) and (orientation:landscape) {
  .ydt-deck{
    overflow-y:auto;justify-content:flex-start;align-items:stretch;
    padding:16px 24px 30px;
  }
  .ydt-slide{max-width:100%;--ydt-gap:14px;transform:none !important}
  .ydt-slide h1{font-size:1.7rem;line-height:1.2}
  .ydt-slide h2{font-size:1.35rem;line-height:1.25}
  .ydt-slide h3{font-size:1.08rem}
  .ydt-slide p,.ydt-slide li{font-size:1.02rem;line-height:1.55}
  .ydt-sub{font-size:.98rem !important}
  .ydt-slide td,.ydt-slide th{font-size:.96rem;padding:8px 12px}
  .ydt-cols{grid-template-columns:repeat(auto-fit,minmax(min(340px,100%),1fr))}
  .ydt-cols-3{grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr))}
  .ydt-cols>*,.ydt-cols-3>*{min-width:0}
  .ydt-slide>*{max-width:100%}
  .ydt-slide p,.ydt-slide li,.ydt-slide td,.passage,.dlg,.stem{overflow-wrap:anywhere}
  .passage,.dlg{line-height:1.75}
}
.ydt-block.is-warn {border-color:rgba(255,140,105,.5)}
.ydt-block.is-warn h3 {color:var(--ydt-warn)}
.ydt-block.is-good {border-color:rgba(123,228,149,.5)}
.ydt-block.is-good h3 {color:var(--ydt-good)}
.ydt-block.is-key {border-color:rgba(255,203,107,.55)}
.ydt-tag {
  display:inline-block;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ydt-dim);border:1px solid var(--ydt-border);border-radius:999px;
  padding:3px 12px;align-self:flex-start;
}
.ok {color:var(--ydt-good);font-weight:600}
.no {color:var(--ydt-bad);font-weight:600;text-decoration:line-through}
.hl {color:var(--ydt-key);font-weight:700}
.dim {color:var(--ydt-dim)}
.tr {color:var(--ydt-dim);font-style:italic}

/* ---- tables ---- */
.ydt-table {width:100%;border-collapse:collapse}
.ydt-table th,.ydt-table td {
  text-align:left;padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.08);
  vertical-align:top;
}
.ydt-table th {color:var(--ydt-accent);font-weight:600;white-space:nowrap}
.ydt-table tbody tr:last-child td {border-bottom:none}

/* ---- reveal (click / down arrow) ---- */
.ydt-step {opacity:0;transition:opacity .2s ease}
.ydt-step.is-shown {opacity:1}

/* ---- help overlay ---- */
.ydt-help {
  flex:1 1 auto;display:flex;align-items:center;justify-content:center;
  padding:30px;
}
.ydt-help-card {
  background:var(--ydt-panel);border:1px solid var(--ydt-border);border-radius:14px;
  padding:30px;display:flex;flex-direction:column;gap:22px;max-width:900px;width:100%;
}
.ydt-keyrow {display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.ydt-keyrow span {color:var(--ydt-dim);font-size:1rem}
.ydt-key {
  display:inline-flex;align-items:center;justify-content:center;
  min-width:46px;height:46px;padding:0 12px;
  border:1px solid var(--ydt-border);border-radius:8px;
  background:rgba(255,255,255,.04);font-size:.95rem;font-weight:600;
}

/* ---- footer ---- */
.ydt-foot {
  flex:0 0 auto;padding:8px 22px;border-top:1px solid rgba(255,255,255,.08);
  display:flex;justify-content:center;
}
.ydt-foot .copyright {color:var(--honey);font-size:.8125rem;font-weight:500;text-align:center;margin:0}

/* ---- index page ---- */
.ydt-index {
  flex:1 1 auto;width:100%;max-width:1200px;margin:0 auto;
  padding:clamp(20px,4vh,50px) 24px;display:flex;flex-direction:column;gap:26px;
}
.ydt-cards {display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.ydt-card {
  background:var(--ydt-panel);
  border:1px solid rgba(255,255,255,.10);
  border-left:5px solid var(--card,var(--ydt-accent));
  border-radius:12px;
  padding:16px 18px;text-decoration:none;color:var(--ydt-text);
  display:flex;flex-direction:column;gap:6px;
  transition:box-shadow .15s ease,border-color .15s ease,transform .15s ease;
}
.ydt-card:hover {
  border-color:var(--card,var(--ydt-accent));
  box-shadow:0 0 0 1px var(--card,var(--ydt-accent)),0 4px 14px rgba(0,0,0,.5);
  transform:translateY(-2px);
}
.ydt-card b {font-size:1.05rem;color:var(--card,var(--ydt-accent))}
.ydt-card small {color:var(--ydt-dim)}
.ydt-card.is-soon {opacity:.45;pointer-events:none}
.ydt-group {
    display:flex;
    flex-direction:column;
    gap:14px;
    --grp:var(--ydt-accent);
}
.ydt-group > h3 {
  color:var(--grp);border-left:4px solid var(--grp);
  padding-left:10px;line-height:1.25;
}
.ydt-index h1 {
    margin:0;
    font-size:clamp(1.7rem,3vw,2.6rem);
    color:var(--ydt-accent);
}

@media (max-width:767px){
  .ydt-top{padding:8px 14px;gap:8px}
  .ydt-deck{padding:16px}
  .header-wrap{padding:13px 10px;margin:14px auto 0}
  .title-img{max-width:180px}
}

@media (max-width:480px){
  .header-wrap{padding:10px 8px}
  .title-img{max-width:135px}
}

/* ================= GRAMMAR COLOR SYSTEM =================
   Kaynak: docs/references/file_names_titles_colors.md */
:root {
    --ydt-accent:#6EC1FF;
    --ydt-accent-rgb:110,193,255;
    --ydt-warn:#FF8C69;
    --ydt-good:#7BE495;
    --ydt-bad:#FF7B7B;
    --ydt-key:#FFCB6B;
    --honey:#fbbf24;
    --ydt-text:#e8eef6;
    --ydt-dim:#9fb0c4;
    --ydt-bg:#00000F;
    --ydt-panel:rgba(255,255,255,.03);
    --ydt-border:rgba(var(--ydt-accent-rgb),.4);
    --ydt-gap:20px;
    /* kategori renkleri (7) */
  --cat-tenses:#ff6b35;
    --cat-advanced:#ab47bc;
    --cat-modal:#00bcd4;
    --cat-nouns:#2196f3;
    --cat-vocab:#4caf50;
    --cat-comm:#e91e63;
    --cat-cond:#ffc107;
    /* temel ogeler */
  --c-verb:#bb86fc;
    --c-aux:#ffe066;
    --c-modal:#d1caff;
    --c-not:#ff1744;
    --c-neg:#ff8888;
    --c-pronoun:#ffb3c0;
    --c-noun:#40c4ff;
    --c-time:#b6a4f7;
    --c-adjective:#00e676;
    --c-adverb:#ffb066;
    --c-prep:#b6a4f7;
    --c-conj:#ffe066;
    --c-article:#bb86fc;
    --c-subject:#40c4ff;
    --c-object:#ffb066;
    --c-positive:#00e676;
    --c-negative:#ff8888;
    --c-neutral:#b6a4f7;
    --c-formal:#b0e57c;
    --c-informal:#ff92d0;
    --c-academic:#673ab7;
    --c-emphasis:#ff5722;
    --c-structure:#009688;
    --c-transform:#2196f3;
}
.verb {color:var(--c-verb)}      .aux {color:var(--c-aux)}
.modal {color:var(--c-modal)}    .not {color:var(--c-not)}
.neg {color:var(--c-neg)}        .pronoun {color:var(--c-pronoun)}
.noun {color:var(--c-noun)}      .time {color:var(--c-time)}
.adjective {color:var(--c-adjective)} .adverb {color:var(--c-adverb)}
.preposition {color:var(--c-prep)}    .conjunction {color:var(--c-conj)}
.article {color:var(--c-article)}     .subject {color:var(--c-subject)}
.object {color:var(--c-object)}       .emphasis {color:var(--c-emphasis)}
.conjunction,.preposition,.conjunction b {font-weight:700}

/* ================= ZENGIN KUTU BILESENLERI ================= */
/* renkli kenarlikli kart: --box rengiyle surulur */
.ydt-box {
  background:var(--ydt-panel);
  border:1px solid rgba(255,255,255,.10);
  border-left:5px solid var(--box,var(--ydt-accent));
  border-radius:12px;padding:clamp(14px,1.5vw,22px);
  display:flex;flex-direction:column;gap:10px;
  box-shadow:0 0 1px var(--box,var(--ydt-accent)),0 2px 8px rgba(0,0,0,.45);
}
.ydt-box > h3 {color:var(--box,var(--ydt-accent))}
.ydt-box-head {
  display:flex;align-items:center;gap:10px;
  color:var(--box,var(--ydt-accent));font-weight:700;
  font-size:clamp(1.05rem,1.5vw,1.4rem);
}
/* numarali rozet */
.ydt-badge {
  display:inline-flex;align-items:center;justify-content:center;
  min-width:34px;height:34px;border-radius:50%;
  background:var(--box,var(--ydt-accent));color:#00000F;
  font-weight:800;font-size:1rem;flex:0 0 auto;
}
/* isaret rozetleri */
.ydt-mark {
  display:inline-flex;align-items:center;justify-content:center;
  width:28px;height:28px;border-radius:50%;font-weight:800;flex:0 0 auto;
}
.ydt-mark.ok {background:rgba(0,230,118,.18);color:#00e676;border:1px solid #00e676}
.ydt-mark.no {background:rgba(255,23,68,.16);color:#ff5f79;border:1px solid #ff5f79;text-decoration:none}
.ydt-mark.tip {background:rgba(255,193,7,.16);color:#ffc107;border:1px solid #ffc107}
.ydt-line {display:flex;align-items:flex-start;gap:12px}

/* formul serit: [ Although ] + [ ozne + yuklem ] */
.ydt-formula {
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  background:rgba(0,0,0,.28);border:1px dashed rgba(255,255,255,.18);
  border-radius:10px;padding:12px 14px;
}
.ydt-slot {
  border:1px solid var(--slot,var(--ydt-accent));color:var(--slot,var(--ydt-accent));
  background:rgba(255,255,255,.04);border-radius:8px;padding:6px 14px;
  font-weight:700;font-size:clamp(.95rem,1.25vw,1.25rem);white-space:nowrap;
}
.ydt-op {color:var(--ydt-dim);font-weight:700;font-size:1.2rem}
/* kucuk etiket cipleri */
.ydt-chip {
  display:inline-block;border-radius:999px;padding:4px 12px;margin:0 6px 6px 0;
  font-size:clamp(.85rem,1.1vw,1.05rem);font-weight:600;
  border:1px solid var(--chip,var(--ydt-accent));color:var(--chip,var(--ydt-accent));
  background:rgba(255,255,255,.03);
}
.ydt-chips {display:flex;flex-wrap:wrap}
/* metin ici vurgular */
.mark-ok {background:rgba(0,230,118,.14);border-bottom:2px solid #00e676;padding:1px 4px;border-radius:4px}
.mark-no {background:rgba(255,23,68,.14);border-bottom:2px solid #ff5f79;padding:1px 4px;border-radius:4px}
.mark-key {background:rgba(255,193,7,.16);border-bottom:2px solid #ffc107;padding:1px 4px;border-radius:4px;font-weight:700}
/* satir renklendirilmis tablo */
.ydt-table tbody tr:nth-child(odd) td {background:rgba(255,255,255,.02)}
.ydt-table td.hl {color:var(--ydt-key);font-weight:700;white-space:nowrap}

/* ---- index anasayfa: stars/fireflies arka plan + blur paneller ---- */
.ydt-home .stars,
.ydt-home .fireflies,
.ydt-home .fireflies-front {
  position:fixed;left:0;top:0;width:100vw;height:100vh;
  pointer-events:none;z-index:0;
}
.ydt-home .fireflies {z-index:1}
.ydt-home .fireflies-front {z-index:2}
.ydt-home .ydt-top,
.ydt-home .ydt-index,
.ydt-home .ydt-foot {position:relative;z-index:10}
.ydt-home .ydt-top,
.ydt-home .ydt-card {
  backdrop-filter:blur(4px);
  -webkit-backdrop-filter:blur(4px);
}

/* Baslik logosu backglow — standart (kaynak: lexitest) */
.logo-container img, .header-wrap img, .header img, .title-logo, .title-img, .main-title-image {
    filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.4));
    filter: drop-shadow(0 0 20px color-mix(in srgb, var(--primary, #3b82f6) 40%, transparent));
}
/* ---- EXTRA PRACTICE (ydt_practice bağlantısı) ---- */
.ydt-topbtn.is-practice {border-color:var(--honey);color:var(--honey)}
.ydt-topbtn.is-practice:hover {background:rgba(251,191,36,.14);border-color:var(--honey);color:var(--honey)}
.ydt-practice-cta {
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  border:1px solid var(--honey);border-left-width:5px;border-radius:12px;
  padding:14px 18px;background:rgba(251,191,36,.07);
}
.ydt-practice-cta p {margin:0;flex:1 1 260px;color:var(--ydt-text)}
.ydt-practice-btn {
  background:var(--honey);color:#1b1200;font-weight:700;text-decoration:none;
  border-radius:10px;padding:10px 18px;font-size:.95rem;line-height:1.2;white-space:nowrap;
}
.ydt-practice-btn:hover {filter:brightness(1.12)}