/* =========================================================
   KeskinLab — 5. Sınıf BTY (v3 çalışma yüzeyi)
   Homepage v2 ile aynı token ailesi; sayfa kendi ürün mantığını taşır.
   ========================================================= */

:root {
  --color-bg: #FCFBFA;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #F6F5F3;
  --color-text: #181A1F;
  --color-text-secondary: #5F646D;
  --color-text-muted: #858A92;
  --color-accent: #8B1E24;
  --color-accent-hover: #74181D;
  --color-accent-active: #5F1318;
  --color-accent-soft: #F4E8E7;
  --color-border: #DEDCD8;

  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;

  --container-width: 1240px;
  --container-pad: 32px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; }

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14.5px;
  border-radius: var(--radius-md);
  padding: 13px 22px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.btn svg { flex-shrink: 0; }

.btn-primary { background: var(--color-accent); color: #FFFFFF; }
.btn-primary:hover { background: var(--color-accent-hover); }
.btn-primary:active { background: var(--color-accent-active); }
.btn-primary[disabled] { background: var(--color-text-muted); cursor: default; }

.btn-secondary { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { border-color: var(--color-text-muted); }

.btn-compact { padding: 10px 16px; font-size: 13.5px; }
.btn-quiet {
  background: transparent; color: var(--color-text-secondary);
  border-color: var(--color-border); padding: 9px 14px; font-size: 13px; font-weight: 500;
}
.btn-quiet:hover { color: var(--color-text); border-color: var(--color-text-muted); }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: var(--radius-md);
  border: 1px solid transparent; background: transparent; color: var(--color-text); cursor: pointer;
}
.icon-btn:hover { background: var(--color-surface-subtle); }

.text-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600; font-size: 13.5px; color: var(--color-accent);
  background: none; border: none; cursor: pointer; padding: 0;
}

.eyebrow {
  font-weight: 600; font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-text-muted); margin: 0 0 8px;
}

.tag-mono {
  font-family: var(--font-mono); font-weight: 600; font-size: 11.5px; letter-spacing: .04em;
  color: var(--color-accent); background: var(--color-surface-subtle);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: 5px 9px; white-space: nowrap;
}

.section-title { font-size: 21px; font-weight: 600; letter-spacing: -.01em; margin: 0; color: var(--color-text); }

/* =========================================================
   Header (homepage v2 ile aynı aile)
   ========================================================= */

.site-header { background: var(--color-bg); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 30; }
.header-row { display: flex; align-items: center; gap: 32px; height: 68px; }
.logo { display: flex; flex-direction: column; gap: 2px; margin-right: 8px; flex-shrink: 0; }
.logo-word { font-weight: 700; font-size: 19px; letter-spacing: -.01em; color: var(--color-text); }
.logo-tagline { font-family: var(--font-mono); font-size: 9px; font-weight: 500; letter-spacing: .12em; color: var(--color-text-muted); }
.main-nav { display: flex; align-items: center; gap: 26px; flex: 1; }
.nav-link { font-size: 14px; font-weight: 500; color: var(--color-text-secondary); padding-bottom: 4px; border-bottom: 2px solid transparent; }
.nav-link:hover { color: var(--color-text); }
.nav-link.is-active { color: var(--color-text); border-bottom-color: var(--color-accent); }
.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; position: relative; }
.mobile-menu-trigger { display: none; font-size: 18px; line-height: 1; }

/* Header "Derse Başla" açılır menüsü (homepage-v2 ile aynı desen) */
.header-menu {
  position: absolute; top: 58px; right: 0; width: 280px; padding: 14px;
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md);
  box-shadow: 0 12px 28px rgba(28,25,23,.12);
}
.header-menu p { font-size: 12px; line-height: 1.4; margin: 0 0 10px; color: var(--color-text-secondary); }
.header-menu a { display: block; padding: 8px 0; border-top: 1px solid var(--color-border); font-size: 13px; color: var(--color-text); }

/* Mobil menü / arka plan / arama (homepage-v2 ile aynı etkileşim ailesi) */
.mobile-backdrop { position: fixed; inset: 0; z-index: 29; background: rgba(28,25,23,.32); }
.mobile-menu {
  position: fixed; z-index: 30; inset: 60px 0 auto; max-height: calc(100dvh - 68px); overflow: auto;
  padding: 18px var(--container-pad); background: var(--color-surface); border-bottom: 1px solid var(--color-border); box-shadow: 0 12px 22px rgba(28,25,23,.1);
}
.mobile-menu a, .mobile-menu button {
  display: block; width: 100%; padding: 11px 0; border: 0; border-bottom: 1px solid var(--color-border);
  background: transparent; text-align: left; color: var(--color-text); font: inherit; font-size: 14px; cursor: pointer;
}
.mobile-menu .menu-close { color: var(--color-accent); }

.search-dialog { position: fixed; z-index: 40; inset: 0; padding: 9vh max(var(--container-pad), 20px); background: rgba(28,25,23,.32); overflow: auto; }
.search-shell { max-width: 560px; margin: 0 auto; background: var(--color-surface); border-radius: var(--radius-md); padding: 18px; box-shadow: 0 20px 40px rgba(28,25,23,.18); }
.search-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.search-head label { font-weight: 600; font-size: 14px; }
.search-head button { background: none; border: none; color: var(--color-text-secondary); font-size: 13px; cursor: pointer; padding: 4px 8px; }
#searchInput {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--color-border);
  font-family: var(--font-sans); font-size: 14.5px; margin-bottom: 12px;
}
.search-results { display: flex; flex-direction: column; gap: 2px; max-height: 50vh; overflow: auto; }
.search-result {
  display: flex; flex-direction: column; gap: 2px; padding: 10px 10px; border-radius: var(--radius-sm);
}
.search-result:hover, .search-result:focus-visible { background: var(--color-surface-subtle); }
.search-result small { font-family: var(--font-mono); font-size: 10px; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .04em; }
.search-result strong { font-size: 14px; color: var(--color-text); }
.search-result span { font-size: 12.5px; color: var(--color-text-secondary); }
.search-help { font-size: 13px; color: var(--color-text-muted); padding: 10px 2px; }
.search-fallback { display: inline-block; font-size: 13px; font-weight: 600; color: var(--color-accent); padding: 2px; }

body.v3-modal-open { overflow: hidden; }

/* =========================================================
   Ders tanıtım şeridi — kompakt, hero değil
   ========================================================= */

.course-strip { padding: 22px 0; border-bottom: 1px solid var(--color-border); }
.course-strip-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.course-strip-copy .eyebrow { margin-bottom: 4px; }
.course-strip-title { font-size: 22px; font-weight: 600; letter-spacing: -.01em; margin: 0; color: var(--color-text); }
.course-strip-meta { font-size: 12.5px; color: var(--color-text-muted); }
.today-badge { display: inline-flex; align-items: center; gap: 6px; }
.today-badge b { color: var(--color-text); font-weight: 600; }

/* =========================================================
   Öğrenci ana yüzeyi
   ========================================================= */

.week-surface { padding: 32px 0 8px; }

.week-surface-head {
  display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 24px;
}
.week-nav-btn {
  width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--color-border);
  background: var(--color-surface); color: var(--color-text-secondary); display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0;
}
.week-nav-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.week-nav-btn[disabled] { opacity: .35; cursor: default; }
.week-nav-btn[disabled]:hover { border-color: var(--color-border); color: var(--color-text-secondary); }

.week-surface-context { display: flex; align-items: center; gap: 10px; }
.week-date { font-size: 13px; color: var(--color-text-muted); }
.week-status-pill {
  font-size: 11px; font-weight: 600; letter-spacing: .02em; text-transform: uppercase;
  padding: 4px 10px; border-radius: 999px; background: var(--color-accent-soft); color: var(--color-accent);
}

.week-surface-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; align-items: start; margin-bottom: 28px; }

.week-kicker { font-size: 13px; font-weight: 600; color: var(--color-accent); text-transform: uppercase; letter-spacing: .04em; margin: 0 0 10px; }
.week-topic { font-size: 30px; font-weight: 700; letter-spacing: -.015em; line-height: 1.15; color: var(--color-text); margin: 0 0 14px; }
.week-explainer { font-size: 16px; line-height: 1.65; color: var(--color-text-secondary); margin: 0 0 22px; max-width: 44ch; }

/* Akış — küçük bir öğrenme rotası gibi (form filtresi değil) */
.flow-chips { display: flex; flex-wrap: wrap; align-items: center; gap: 0; margin-bottom: 26px; }
.flow-chip {
  display: inline-flex; align-items: center; gap: 7px; font-size: 13px; font-weight: 600;
  color: var(--color-text); background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 999px; padding: 7px 14px 7px 8px;
}
.flow-chip-index {
  display: inline-flex; align-items: center; justify-content: center; width: 18px; height: 18px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 600; color: #fff; background: var(--color-accent); border-radius: 50%;
}
.flow-connector { width: 16px; height: 1px; background: var(--color-border); margin: 0 6px; flex-shrink: 0; }

.week-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* Hafta görsel alanı — tema bazlı "sahne" yer tutucu (ikon kutusu değil) */
.week-visual {
  position: relative; aspect-ratio: 4 / 3; border-radius: var(--radius-lg); overflow: hidden;
  background: var(--color-surface-subtle);
  box-shadow: inset 0 0 0 1px var(--color-border);
}
.week-visual svg { width: 100%; height: 100%; display: block; }
.week-visual .scene-tag {
  position: absolute; left: 14px; bottom: 12px; font-family: var(--font-mono); font-size: 9.5px; font-weight: 600;
  letter-spacing: .05em; color: var(--color-text-muted); background: rgba(255,255,255,.7); padding: 3px 7px; border-radius: 4px;
}

/* Hafta materyalleri — tek aktif önizleme ve materyal seçici */

.week-materials { border-top: 1px solid var(--color-border); padding: 20px 0; }
.materials-empty { font-size: 13.5px; color: var(--color-text-muted); margin: 0; }

.material-viewer {
  display: grid;
  grid-template-columns: minmax(0, 72fr) minmax(190px, 28fr);
  grid-template-areas: "stage selector";
  gap: 36px;
  align-items: start;
}
.material-stage-column { grid-area: stage; min-width: 0; }
.material-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: clamp(320px, 31vw, 410px);
  overflow: hidden;
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  touch-action: pan-y;
  user-select: none;
}
.material-stage img { width: 100%; height: 100%; object-fit: contain; pointer-events: none; -webkit-user-drag: none; }
.material-fullscreen-btn {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: rgba(252, 251, 250, .94);
  color: var(--color-text);
  cursor: pointer;
  z-index: 2;
}
.material-fullscreen-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.material-fullscreen-btn svg { width: 16px; height: 16px; }
.material-stage-column:fullscreen {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  padding: 24px;
  background: #202124;
}
.material-stage-column:fullscreen .material-stage {
  flex: 1 1 auto;
  min-height: 0;
  height: auto;
  border: 0;
  border-radius: 0;
}
.material-stage-column:fullscreen .material-viewer-footer { flex: 0 0 auto; }
.material-stage-column:fullscreen .material-pagination { color: #E6E3DF; }
.material-stage-column:fullscreen .material-page-btn { color: #FFFFFF; }
.material-stage-column:fullscreen .material-page-btn:disabled { color: #A6A6A6; }
.material-viewer-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 36px;
  padding-top: 10px;
}
.material-pagination { display: flex; align-items: center; gap: 10px; color: var(--color-text-secondary); font-size: 13px; }
.material-page-btn {
  border: 0;
  padding: 3px 2px;
  background: none;
  color: var(--color-text);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.material-page-btn:disabled { color: var(--color-text-muted); cursor: default; opacity: .5; }
.material-selector { grid-area: selector; display: flex; flex-direction: column; min-width: 0; }
.material-selector-item {
  position: relative;
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--color-border);
  padding: 14px 10px 14px 16px;
  background: none;
  color: var(--color-text-secondary);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}
.material-selector-item:first-child { border-top: 1px solid var(--color-border); }
.material-selector-item:hover { color: var(--color-text); }
.material-selector-item.is-active { color: var(--color-text); font-weight: 600; }
.material-selector-item.is-active::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: 2px;
  background: var(--color-accent);
}
.material-label-short { display: none; }

.lesson-files { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--color-border); }
.lesson-files-title {
  margin: 0 0 8px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .07em;
}
.lesson-files-list { border-top: 1px solid var(--color-border); }
.lesson-file-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 13.5px;
}
.lesson-file-name { color: var(--color-text); font-weight: 500; }
.lesson-file-actions { display: inline-flex; align-items: center; gap: 18px; flex-shrink: 0; }
.lesson-file-actions a { color: var(--color-text-secondary); }
.lesson-file-actions a:hover { color: var(--color-accent); }

/* Takvim bağlamı */

.week-calendar-note {
  display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--color-text-secondary);
  background: var(--color-accent-soft); border-radius: var(--radius-sm); padding: 10px 14px; margin-bottom: 20px;
}
.week-calendar-note svg { color: var(--color-accent); flex-shrink: 0; }
.week-calendar-note b { color: var(--color-text); font-weight: 600; }
.week-calendar-note[hidden] { display: none; }

/* =========================================================
   37 hafta gezinimi
   ========================================================= */

.term-nav { padding: 36px 0; border-top: 1px solid var(--color-border); }
.term-nav-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }

.theme-week-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 4px; }
.week-pill {
  width: 34px; height: 34px; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 600; color: var(--color-text-secondary);
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer;
}
.week-pill:hover { border-color: var(--color-accent); color: var(--color-accent); }
.week-pill.is-active { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }
.week-pill.is-special { color: var(--color-text-muted); background: var(--color-surface-subtle); font-style: italic; font-size: 9.5px; }

.all-weeks-panel { margin-top: 20px; border-top: 1px solid var(--color-border); padding-top: 16px; }
.theme-group { margin-bottom: 18px; }
.theme-group-label {
  display: flex; align-items: baseline; gap: 8px; font-size: 12.5px; font-weight: 600;
  color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .03em; margin: 0 0 8px;
}
.theme-group-rows { display: flex; flex-direction: column; }
.week-row {
  display: grid; grid-template-columns: 48px 110px 1fr; gap: 14px; align-items: center;
  padding: 9px 6px; border-radius: var(--radius-sm); cursor: pointer; font-size: 13.5px;
}
.week-row:hover { background: var(--color-surface-subtle); }
.week-row.is-active { background: var(--color-accent-soft); }
.week-row .wn { font-family: var(--font-mono); color: var(--color-accent); font-weight: 600; font-size: 12px; }
.week-row .wd { color: var(--color-text-muted); font-size: 12.5px; }
.week-row .wt { color: var(--color-text); }
.week-row.is-special .wt { color: var(--color-text-muted); font-style: italic; }

/* =========================================================
   Öğretmen katmanı
   ========================================================= */

.teacher-layer { border-top: 1px solid var(--color-border); padding: 20px 0 56px; }

.teacher-toggle {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 14px 18px; cursor: pointer; font-size: 14px; font-weight: 600; color: var(--color-text);
}
.teacher-toggle-label { display: flex; align-items: center; gap: 10px; }
.teacher-toggle-label svg { color: var(--color-accent); }
.teacher-toggle-chevron { transition: transform .15s ease; color: var(--color-text-muted); }
.teacher-toggle[aria-expanded="true"] .teacher-toggle-chevron { transform: rotate(180deg); }

.teacher-panel {
  display: grid; grid-template-columns: 1fr 1fr 1.3fr; gap: 28px;
  margin-top: 16px; padding: 20px; background: var(--color-surface-subtle); border-radius: var(--radius-md);
}
.teacher-panel[hidden] { display: none; }
.teacher-col-label { font-size: 11.5px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; color: var(--color-text-muted); margin: 0 0 10px; }
.teacher-links { display: flex; flex-direction: column; gap: 8px; }
.teacher-link { font-size: 13.5px; font-weight: 500; color: var(--color-text-secondary); }
.teacher-link:hover { color: var(--color-accent); }
.teacher-empty { font-size: 13px; color: var(--color-text-muted); font-style: italic; }

.curriculum-details summary { font-size: 13px; font-weight: 500; color: var(--color-accent); cursor: pointer; }
.curriculum-body { margin-top: 12px; font-size: 13px; color: var(--color-text-secondary); line-height: 1.6; }
.curriculum-body .code-line { font-family: var(--font-mono); font-size: 11.5px; color: var(--color-text); margin-bottom: 6px; display: block; }
.curriculum-body ul { margin-top: 8px; }
.curriculum-body li { padding: 3px 0 3px 14px; position: relative; }
.curriculum-body li::before { content: "–"; position: absolute; left: 0; color: var(--color-text-muted); }

/* =========================================================
   Footer
   ========================================================= */

.site-footer { border-top: 1px solid var(--color-border); padding: 22px 0; }
.footer-row { display: flex; align-items: center; justify-content: space-between; }
.footer-text { font-size: 12.5px; color: var(--color-text-muted); }
.footer-nav { display: flex; gap: 20px; }
.footer-nav a { font-size: 12.5px; color: var(--color-text-secondary); }
.footer-nav a:hover { color: var(--color-text); }

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 1080px) {
  .main-nav { display: none; }
  .mobile-menu-trigger { display: flex; }
  .week-surface-grid { grid-template-columns: 1fr; }
  .week-visual { order: -1; aspect-ratio: 16/9; }
  .teacher-panel { grid-template-columns: 1fr 1fr; }
  .teacher-col-curriculum { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  :root { --container-pad: 18px; }
  html, body { overflow-x: clip; }
  .header-row { height: 58px; gap: 12px; }
  .logo-word { font-size: 17px; }
  .course-strip-row { flex-direction: column; align-items: flex-start; gap: 6px; }
  .week-topic { font-size: 22px; }
  .week-surface-head { gap: 8px; }
  .week-surface-context { flex-wrap: wrap; justify-content: center; gap: 6px; }
  .week-actions { flex-direction: column; align-items: stretch; }
  .week-actions .btn { justify-content: center; }
  .week-materials { padding: 18px 0; }
  .material-viewer {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "selector" "stage";
    gap: 14px;
  }
  .material-selector {
    flex-direction: row;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
  }
  .material-selector-item {
    width: auto;
    flex: 0 0 auto;
    border-bottom: 1px solid var(--color-border);
    padding: 9px 12px;
    white-space: nowrap;
  }
  .material-selector-item:first-child { border-top: 0; }
  .material-selector-item.is-active::before { top: auto; right: 10px; bottom: 0; left: 10px; width: auto; height: 2px; }
  .material-label-full { display: none; }
  .material-label-short { display: inline; }
  .material-stage { height: clamp(240px, 68vw, 280px); }
  .material-viewer-footer { padding-top: 8px; }
  .theme-week-pills { gap: 6px; }
  .week-pill { width: 30px; height: 30px; font-size: 10.5px; }
  .week-row { grid-template-columns: 40px 1fr; grid-template-areas: "n t" ". d"; }
  .week-row .wn { grid-area: n; }
  .week-row .wt { grid-area: t; }
  .week-row .wd { grid-area: d; font-size: 11.5px; }
  .teacher-panel { grid-template-columns: 1fr; }
  .footer-row { flex-direction: column; gap: 10px; align-items: flex-start; }
  .header-menu { width: calc(100vw - 36px); right: -6px; }
  .search-dialog { padding: 6vh 14px; }
  .search-shell { max-width: 100%; }
}