/* =========================================================
   KeskinLab — Homepage v2 (Golden Master eşleşmesi)
   Kilitli renk tokenları ve IBM Plex tipografi sistemi
   ========================================================= */

: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-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 { list-style: none; margin: 0; padding: 0; }

.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-family: var(--font-sans);
  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-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;
}

/* ---------- Icon buttons ---------- */

.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); }

.icon-btn-round {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
}

/* ---------- Text link ---------- */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent);
}
.text-link-sm { font-size: 13px; }

/* ---------- Eyebrow / labels ---------- */

.eyebrow {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: 0 0 14px;
}
.eyebrow-tight { margin-bottom: 18px; }

.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;
}
.tag-mono-muted {
  color: var(--color-text-secondary);
  background: transparent;
}

/* =========================================================
   Header
   ========================================================= */

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.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;
}

/* =========================================================
   Hero
   ========================================================= */

.hero {
  padding: 56px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 460px) 1fr;
  gap: 56px;
  align-items: center;
}

.hero-title {
  font-size: 46px;
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 0 0 20px;
  color: var(--color-text);
}

.accent-word { color: var(--color-accent); }

.hero-desc {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 440px;
  margin: 0 0 28px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero-media {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-image-frame {
  position: relative;
  aspect-ratio: 1.56 / 1;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity .25s ease;
}
.hero-slide.is-active { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .hero-slide { transition: none; }
}

.hero-media-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}
.dot {
  position: relative;
  border: 0;
  padding: 0;
  cursor: pointer;
  width: 18px;
  height: 4px;
  border-radius: 2px;
  background: var(--color-border);
}
.dot.is-active { background: var(--color-accent); width: 22px; }
.dot::after { content: ""; position: absolute; inset: -10px -3px; }
.dot:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 5px; }

.hero-arrows {
  display: flex;
  gap: 8px;
}

/* Placeholder media (final asset yerine geçici görsel alanı) */
.placeholder-media {
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}
.placeholder-icon { opacity: .55; }

/* =========================================================
   Quick access strip
   ========================================================= */

.quick-strip {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.quick-strip-row {
  display: flex;
  align-items: flex-start;
}

.quick-item {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 24px 20px;
  border-left: 1px solid var(--color-border);
}
.quick-item:first-child { border-left: none; padding-left: 0; }
.quick-item:last-child { padding-right: 0; }

.quick-icon {
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.quick-title {
  font-size: 14.5px;
  font-weight: 600;
  margin: 0 0 3px;
  color: var(--color-text);
}

.quick-desc {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--color-text-muted);
  margin: 0;
}

/* =========================================================
   Dersler
   ========================================================= */

.courses {
  padding: 56px 0 48px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 28px;
}

.section-title {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--color-text);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.course-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 18px 16px;
  display: flex;
  flex-direction: column;
}

.course-card--warm .course-media { background: #F5E9E7; }
.course-card--cool .course-media { background: #ECEDF3; }
.course-card--neutral .course-media { background: var(--color-surface-subtle); }
.course-card--tint .course-media { background: #EFEAF3; }

.course-media {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-sm);
  border: none;
  margin-bottom: 16px;
}
.course-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: right bottom;
}
.course-media .placeholder-icon { color: var(--color-text-secondary); opacity: .45; }

.course-body { margin-bottom: 14px; }

.course-title {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--color-text);
}

.course-sub {
  font-size: 12.5px;
  color: var(--color-text-muted);
  margin: 0;
}

.course-go {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.course-go:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.course-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-text-secondary);
}
.meta-item svg { color: var(--color-text-muted); }

/* =========================================================
   Bu Hafta
   ========================================================= */

.this-week {
  padding: 40px 0 48px;
}

.week-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.week-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
}
.week-context { display:flex; align-items:center; gap:16px; margin-bottom:12px; }
.week-context > div:first-child { flex-shrink:0; }
.week-source-range { display:block; margin-top:4px; font-size:12px; color:var(--color-text-secondary); }
.week-lead:not([hidden]) { margin-bottom:12px; }
.week-card { min-width:0; }
.week-card .week-topic { white-space:normal; overflow:visible; }
.week-dates, .week-lead { margin:4px 0 0; font-size:13px; color:var(--color-text-secondary); }
.week-status { margin:0; flex:1; font-size:13px; color:var(--color-text-secondary); }
.week-controls { display:flex; gap:6px; }
.week-controls button { border:1px solid var(--color-border); background:var(--color-surface); padding:6px 9px; border-radius:var(--radius-sm); color:var(--color-text-secondary); font:inherit; font-size:12px; cursor:pointer; }
.week-controls button:disabled { opacity:.45; cursor:default; }
.week-row { grid-template-columns:repeat(2, 1fr); }
.week-links { display:flex; flex-direction:column; gap:7px; flex-shrink:0; }
.week-links a { font-size:12px; font-weight:600; color:var(--color-accent); white-space:nowrap; }
.week-card--complete { background:var(--color-surface-subtle); }
.week-empty { color:var(--color-text-secondary); }

.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-actions { position:relative; }
.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); }
.mobile-menu-trigger { display:none; }
.homepage-modal-open { overflow:hidden; }
.mobile-backdrop { position:fixed; inset:0; z-index:29; background:rgba(28,25,23,.32); }
.mobile-menu { max-height:calc(100dvh - 68px); overflow:auto; }
.search-dialog { overflow:auto; }
.search-fallback { color:var(--color-accent); font-size:13px; }
.search-result:focus-visible { outline:2px solid var(--color-accent); outline-offset:-2px; }
.quick-item:focus-visible, .course-card:focus-visible { outline:2px solid var(--color-accent); outline-offset:3px; }
.mobile-menu { position:fixed; z-index:30; inset:60px 0 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; }
.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); }
.search-shell { max-width:640px; margin:auto; padding:18px; border:1px solid var(--color-border); border-radius:var(--radius-md); background:var(--color-surface); box-shadow:0 18px 40px rgba(28,25,23,.2); }
.search-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:12px; font-size:14px; font-weight:600; }
.search-head button { border:0; background:transparent; color:var(--color-text-secondary); font:inherit; font-size:12px; cursor:pointer; }
#searchInput { width:100%; padding:11px; border:1px solid var(--color-border); border-radius:var(--radius-sm); font:inherit; }
.search-results { max-height:52vh; overflow:auto; margin-top:10px; }
.search-help { font-size:13px; color:var(--color-text-secondary); }
.search-result { display:grid; gap:2px; padding:10px 0; border-top:1px solid var(--color-border); color:var(--color-text); }
.search-result small { color:var(--color-accent); font-family:var(--font-mono); font-size:10px; }
.search-result strong { font-size:13px; }.search-result span { font-size:12px; color:var(--color-text-secondary); }

.week-body { flex: 1; min-width: 0; }

.week-course {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin: 0 0 2px;
}

.week-topic {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-text);
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* =========================================================
   Alt panel
   ========================================================= */

.bottom-panels {
  padding: 0 0 64px;
}

.panels-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--color-text);
}
.panel-head .panel-title { margin-bottom: 0; }

.panel-title-icon { color: var(--color-accent); }

/* Mini grid — Golden Master'daki 4+2 ikon ızgarası */
.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.mini-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  padding: 14px 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 11.5px;
  font-weight: 500;
}
.mini-item svg { color: var(--color-text); }
.mini-item:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.mini-item:hover svg { color: var(--color-accent); }

/* Duyurular */

.announce-list {
  display: flex;
  flex-direction: column;
}

.announce-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--color-border);
}
.announce-item:first-child { border-top: none; padding-top: 0; }
.announce-item:last-child { padding-bottom: 0; }

.announce-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 3px;
}

.announce-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  margin: 0;
}

.announce-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
  white-space: nowrap;
  margin-top: 1px;
}

/* Takvim */

.calendar-list {
  display: flex;
  flex-direction: column;
}

.calendar-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--color-border);
}
.calendar-item:first-child { border-top: none; padding-top: 0; }
.calendar-item:last-child { padding-bottom: 0; }

.cal-date {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--color-accent);
  flex-shrink: 0;
  width: 66px;
}

.cal-label {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* =========================================================
   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; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-desc { max-width: none; }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .panels-row { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  :root { --container-pad: 20px; }
  .header-row { height: 60px; }
  .hero { padding: 36px 0 32px; }
  .hero-title { font-size: 34px; }
  .quick-strip-row { flex-direction: column; }
  .quick-item {
    border-left: none;
    border-top: 1px solid var(--color-border);
    padding: 18px 0 !important;
    width: 100%;
  }
  .quick-item:first-child { border-top: none; }
  .course-grid { grid-template-columns: 1fr; }
  .week-row { grid-template-columns: 1fr; }
  .week-card { flex-wrap: wrap; }
  .week-context { align-items:flex-start; flex-wrap:wrap; }.week-status { flex-basis:100%; order:3; }.week-links { flex-direction:row; width:100%; }
  .header-row { gap:10px; }.header-actions { margin-left:auto; gap:6px; }.header-actions .btn-primary { padding:8px 10px; font-size:12px; }.mobile-menu-trigger { display:flex; }.mobile-menu { inset:60px 0 auto; }
  .mini-grid { grid-template-columns: repeat(3, 1fr); }
  .section-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-row { flex-direction: column; gap: 10px; align-items: flex-start; }
}