#seokiller-app * {
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
}

#seokiller-app {
  color: #fff;
  min-height: 100vh;
  background: linear-gradient(180deg, #050505 0%, #0b0b0b 35%, #111111 100%);
  padding-bottom: 110px;
}

#seokiller-app img {
  display: block;
}

.skl-app-shell {
  width: min(1600px, 96%);
  margin: 0 auto;
  padding: 16px 0 0;
}

.skl-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  margin-bottom: 20px;
  padding: 14px 0;
  border: none;
  border-radius: 0;
  background: linear-gradient(180deg, rgba(10,10,10,.96), rgba(10,10,10,.75));
  backdrop-filter: blur(10px);
  box-shadow: none;
}

.skl-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.skl-search-wrap {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
}

.skl-search-box {
  position: relative;
  flex: 1;
  min-width: 0;
}

.skl-search-box input {
  width: 100%;
  height: 52px;
  padding: 0 18px 0 46px;
  border-radius: 8px;
  border: none;
  background: rgba(255,255,255,.08);
  color: #fff;
  font-size: 1rem;
  outline: none;
  box-shadow: none;
}

.skl-search-box input::placeholder {
  color: rgba(255,255,255,.55);
}

.skl-search-box input:focus {
  background: rgba(255,255,255,.12);
  box-shadow: 0 0 0 2px rgba(255,255,255,.08);
}

.skl-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255,255,255,.7);
  font-size: 1rem;
  pointer-events: none;
}

.skl-filters-toggle {
  height: 52px;
  padding: 0 18px;
  border: none;
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: none;
}

.skl-filters-toggle:hover {
  background: rgba(255,255,255,.14);
}

.skl-filters-panel {
  display: none;
  margin-top: 12px;
  padding: 0;
  border: none;
  background: transparent;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.skl-filters-panel.is-open {
  display: grid;
}

.skl-filters-panel select {
  width: 100%;
  min-width: 0;
  height: 46px;
  padding: 0 14px;
  border-radius: 8px;
  border: none;
  background: rgba(255,255,255,.08);
  color: #fff;
  outline: none;
}

.skl-filters-panel option {
  color: #111;
}

.skl-hero {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 30px;
}

.skl-hero-card {
  position: relative;
  min-height: 460px;
  overflow: hidden;
  border-radius: 10px;
  border: none;
  background: #111;
  box-shadow: none;
  cursor: pointer;
  transition: transform .24s ease, filter .24s ease;
}

.skl-hero-card:hover {
  transform: scale(1.015);
  filter: brightness(1.06);
}

.skl-hero-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.skl-hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0,0,0,.10) 0%, rgba(0,0,0,.35) 40%, rgba(0,0,0,.85) 100%);
}

.skl-hero-content {
  position: absolute;
  z-index: 2;
  left: 26px;
  right: 26px;
  bottom: 24px;
}

.skl-hero-content h2 {
  margin: 10px 0 12px;
  font-size: clamp(1.5rem, 2.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.06;
  color: #fff;
  text-shadow: 0 4px 18px rgba(0,0,0,.55);
}

.skl-hero-content p {
  margin: 0;
  font-size: 1rem;
  color: rgba(255,255,255,.88);
  text-shadow: 0 2px 12px rgba(0,0,0,.55);
}

.skl-chip {
  display: inline-flex;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(0,0,0,.45);
  color: #fff;
  font-size: .82rem;
  font-weight: 700;
}

.skl-primary-btn,
.skl-back-btn {
  margin-top: 16px;
  border: none;
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  background: rgba(255,255,255,.16);
  backdrop-filter: blur(6px);
}

.skl-primary-btn:hover,
.skl-back-btn:hover {
  background: rgba(255,255,255,.22);
}

.skl-rail {
  margin: 0 0 34px;
}

.skl-rail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.skl-rail-head h2 {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
}

.skl-rail-scroll {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}

.skl-rail-scroll::-webkit-scrollbar {
  height: 8px;
}

.skl-rail-scroll::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,.16);
  border-radius: 999px;
}

.skl-course-card {
  flex: 0 0 320px;
  scroll-snap-align: start;
  border-radius: 10px;
  overflow: hidden;
  border: none;
  background: #111;
  box-shadow: none;
  cursor: pointer;
  transition: transform .22s ease, filter .22s ease;
}

.skl-course-card:hover {
  transform: scale(1.03);
  filter: brightness(1.08);
}

.skl-course-thumb {
  position: relative;
  aspect-ratio: 16 / 11;
  overflow: hidden;
}

.skl-course-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.skl-course-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0,0,0,.08) 0%, rgba(0,0,0,.32) 42%, rgba(0,0,0,.88) 100%);
}

.skl-course-body {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  z-index: 2;
}

.skl-course-meta {
  font-size: .78rem;
  font-weight: 700;
  color: rgba(255,255,255,.72);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.skl-course-body h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.2;
  color: #fff !important;
  text-shadow: 0 2px 10px rgba(0,0,0,.5);
}

.skl-course-body p {
  margin: 0 0 8px;
  color: rgba(255,255,255,.88);
  font-size: .94rem;
}

.skl-course-body small {
  color: rgba(255,255,255,.82);
  font-size: .84rem;
}

.skl-progress-line {
  height: 6px;
  margin: 10px 0 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.15);
  overflow: hidden;
}

.skl-progress-line.big {
  height: 8px;
}

.skl-progress-line span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: #ffffff;
}

.skl-grid-section {
  margin-bottom: 34px;
}

.skl-grid-courses {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.skl-empty-state {
  padding: 22px;
  background: rgba(255,255,255,.04);
  border-radius: 8px;
  color: rgba(255,255,255,.72);
}

.skl-course-hero {
  margin-bottom: 26px;
}

.skl-course-hero-grid {
  display: grid;
  grid-template-columns: 520px 1fr;
  gap: 26px;
  align-items: stretch;
  background: rgba(255,255,255,.03);
  border-radius: 10px;
  overflow: hidden;
}

.skl-course-hero-image {
  position: relative;
  min-height: 340px;
}

.skl-course-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.skl-course-hero-info {
  padding: 28px 28px 24px 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.skl-course-hero-info h1 {
  margin: 14px 0 12px;
  font-size: clamp(2rem, 3vw, 3.2rem);
  line-height: 1.02;
  color: #fff;
}

.skl-course-hero-info p {
  margin: 0 0 14px;
  color: rgba(255,255,255,.82);
  font-size: 1rem;
}

.skl-course-hero-info strong {
  color: #fff;
  font-size: .95rem;
}

.skl-lessons-panel {
  padding: 24px;
  border-radius: 10px;
  background: rgba(255,255,255,.03);
}

.skl-lessons-panel h2 {
  margin: 0 0 16px;
  font-size: 1.5rem;
  font-weight: 800;
}

.skl-lessons-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skl-lesson-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 14px;
  border-radius: 8px;
  background: rgba(255,255,255,.04);
  border: none;
  cursor: pointer;
  transition: background .18s ease, transform .18s ease;
}

.skl-lesson-row:hover {
  background: rgba(255,255,255,.08);
  transform: translateY(-1px);
}

.skl-lesson-row.is-done {
  background: rgba(255,255,255,.09);
}

.skl-lesson-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.skl-lesson-left img {
  width: 96px;
  height: 62px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}

.skl-lesson-copy {
  min-width: 0;
}

.skl-lesson-copy h4 {
  margin: 0 0 4px;
  font-size: 1rem;
  color: #fff !important;
  line-height: 1.2;
}

.skl-lesson-copy p {
  margin: 0;
  color: rgba(255,255,255,.72);
  font-size: .92rem;
}

.skl-lesson-index {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,.10);
  font-weight: 800;
  flex-shrink: 0;
}

.skl-lesson-status {
  font-size: 1.25rem;
  color: rgba(255,255,255,.88);
  flex-shrink: 0;
}

.skl-bottom-nav {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 60;
  display: flex;
  gap: 10px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(10,10,10,.88);
  backdrop-filter: blur(12px);
}

.skl-nav-btn {
  border: none;
  background: transparent;
  color: rgba(255,255,255,.72);
  padding: 12px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  transition: background .16s ease, color .16s ease;
}

.skl-nav-btn.active,
.skl-nav-btn:hover {
  color: #fff;
  background: rgba(255,255,255,.12);
}

.skl-loading,
.skl-error {
  width: min(640px, 92%);
  margin: 90px auto;
  padding: 26px;
  text-align: center;
  border-radius: 10px;
  background: rgba(255,255,255,.04);
  color: #fff;
}

@media (max-width: 1280px) {
  .skl-grid-courses {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .skl-course-hero-grid {
    grid-template-columns: 420px 1fr;
  }
}

@media (max-width: 1100px) {
  .skl-hero {
    grid-template-columns: 1fr;
  }

  .skl-grid-courses {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .skl-course-hero-grid {
    grid-template-columns: 1fr;
  }

  .skl-course-hero-info {
    padding: 24px;
  }
}

@media (max-width: 768px) {
  .skl-topbar {
    padding: 12px 0;
  }

  .skl-search-wrap {
    flex-direction: row;
    align-items: stretch;
  }

  .skl-search-box {
    flex: 1;
  }

  .skl-filters-toggle {
    flex: 0 0 auto;
  }

  .skl-filters-panel {
    grid-template-columns: 1fr;
  }

  .skl-grid-courses {
    grid-template-columns: 1fr;
  }

  .skl-course-card {
    flex-basis: 270px;
  }

  .skl-bottom-nav {
    width: calc(100% - 16px);
    justify-content: space-between;
  }

  .skl-nav-btn {
    flex: 1;
    padding: 12px 10px;
    font-size: .9rem;
  }

  .skl-lesson-left {
    align-items: flex-start;
  }

  .skl-lesson-left img {
    width: 82px;
    height: 56px;
  }

  .skl-hero-card {
    min-height: 380px;
  }

  .skl-course-hero-image {
    min-height: 260px;
  }
}