:root {
  --bg-main: #030b1d;
  --bg-deep: #071327;
  --card: rgba(5, 14, 34, 0.92);
  --card-soft: rgba(14, 27, 54, 0.88);
  --line: rgba(109, 140, 199, 0.18);
  --text: #f3f7ff;
  --muted: #a9bad9;
  --blue: #7db2ff;
  --pill: #162747;
  --accent: #ffa35b;
  --warning-bg: rgba(255, 163, 91, 0.1);
  --warning-border: rgba(255, 163, 91, 0.45);
  --warning-text: #ffbd88;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  color: var(--text);
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  background:
    radial-gradient(circle at top center, rgba(255, 163, 91, 0.1), transparent 18%),
    radial-gradient(circle at left center, rgba(0, 90, 255, 0.12), transparent 24%),
    linear-gradient(180deg, #021028 0%, #030916 100%);
}

body {
  min-height: 100vh;
}

a {
  text-decoration: none;
}

button {
  font: inherit;
}

.page-shell {
  width: min(1720px, calc(100% - 56px));
  margin: 0 auto;
  padding: 34px 0 40px;
}

.hero-banner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  padding: 24px 30px 28px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(2, 10, 28, 0.96), rgba(3, 11, 29, 0.92));
  box-shadow: var(--shadow);
}

.hero-eyebrow {
  margin: 0 0 10px;
  color: var(--blue);
  letter-spacing: 0.08em;
  font-size: 0.72rem;
}

.hero-banner h1 {
  margin: 0;
  font-size: clamp(3rem, 4vw, 4.4rem);
  line-height: 1.04;
}

.hero-subtitle {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 760px;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

.nav-pill {
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(23, 35, 63, 0.9);
  color: var(--text);
  transition: 0.2s ease;
}

.nav-pill:hover {
  background: rgba(35, 53, 91, 0.95);
}

.nav-pill.active {
  background: var(--accent);
  color: #111827;
}

.nav-pill.is-disabled {
  opacity: 0.55;
  pointer-events: none;
  cursor: not-allowed;
}

.main-layout {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 420px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.left-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.side-card,
.content-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(3, 11, 29, 0.96), rgba(5, 15, 36, 0.94));
  box-shadow: var(--shadow);
}

.side-card {
  padding: 22px;
}

.side-title {
  margin: 0 0 16px;
  font-size: 1rem;
}

.side-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.count-badge,
.small-pill,
.level-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  white-space: nowrap;
}

.count-badge {
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  background: rgba(25, 45, 82, 0.96);
  color: var(--blue);
  font-weight: 700;
}

.small-pill,
.level-pill,
.tag-pill,
.related-btn,
.category-btn {
  background: var(--pill);
  color: var(--text);
}

.small-pill,
.level-pill {
  padding: 10px 15px;
  color: #ffd8b5;
  font-weight: 600;
}

.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.category-btn {
  border: 1px solid rgba(109, 140, 199, 0.18);
  padding: 12px 18px;
  border-radius: 18px;
  cursor: pointer;
  transition: 0.2s ease;
}

.category-btn:hover {
  border-color: rgba(125, 178, 255, 0.45);
}

.category-btn.active {
  background: var(--accent);
  color: #111827;
  border-color: transparent;
}

.tactic-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tactic-item {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 22px;
  padding: 18px;
  background: rgba(18, 30, 58, 0.8);
  color: var(--text);
  cursor: pointer;
  transition: 0.2s ease;
}

.tactic-item:hover {
  border-color: rgba(125, 178, 255, 0.3);
}

.tactic-item.active {
  border-color: rgba(125, 178, 255, 0.85);
  box-shadow: 0 0 0 1px rgba(125, 178, 255, 0.12) inset;
}

.tactic-item-category {
  margin: 0 0 8px;
  color: var(--blue);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.tactic-item-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.tactic-item h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.4;
}

.tactic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.meta-pill,
.tag-pill,
.related-btn {
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.84rem;
}

.meta-pill {
  background: rgba(25, 45, 82, 0.96);
  color: #d7e5ff;
}

.right-panel {
  min-width: 0;
}

.detail-wrap {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.content-card {
  padding: 24px;
}

.headline-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.section-label {
  margin: 0 0 10px;
  color: var(--blue);
  letter-spacing: 0.08em;
  font-size: 0.82rem;
}

.detail-title {
  margin: 0;
  font-size: clamp(2.4rem, 3vw, 4rem);
  line-height: 1.12;
}

.detail-summary {
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 1.08rem;
  max-width: 1100px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.media-row {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
}

.media-card h3,
.content-card h3 {
  margin: 0;
  font-size: 1rem;
}

.media-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.carousel-wrap {
  position: relative;
  display: block;
}

.carousel-stage {
  width: 100%;
  min-height: 292px;
  height: 360px;
  border-radius: 26px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0 72px;
}

.carousel-stage video,
.carousel-stage img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 18px;
  display: block;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 52px;
  height: 52px;
  border: none;
  border-radius: 999px;
  background: rgba(25, 45, 82, 0.96);
  color: #dbe8ff;
  font-size: 2rem;
  cursor: pointer;
  transition: 0.2s ease;
}

.carousel-btn:hover:not(:disabled) {
  background: rgba(41, 68, 116, 1);
}

.carousel-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

#videoPrevBtn,
#imagePrevBtn {
  left: 12px;
}

#videoNextBtn,
#imageNextBtn {
  right: 12px;
}

.warning-box {
  border: 1px dashed var(--warning-border);
  background: var(--warning-bg);
  color: var(--warning-text);
  border-radius: 18px;
  padding: 16px;
  line-height: 1.6;
}

.rich-content {
  color: var(--text);
  line-height: 1.8;
}

.rich-content h4 {
  margin: 0 0 12px;
  font-size: 1rem;
  color: #ffd8b5;
}

.rich-content h4:not(:first-child) {
  margin-top: 24px;
}

.rich-content p,
.rich-content ul {
  margin: 0;
}

.rich-content ul {
  padding-left: 22px;
}

.rich-content li + li {
  margin-top: 8px;
}

.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-btn {
  border: none;
  cursor: pointer;
  transition: 0.2s ease;
}

.related-btn:hover {
  background: rgba(41, 68, 116, 1);
}

.search-block {
  margin-bottom: 20px;
}

.search-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}

.search-input {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border-radius: 16px;
  border: 1px solid rgba(109, 140, 199, 0.18);
  background: rgba(18, 30, 58, 0.8);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  box-sizing: border-box;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.search-input::placeholder {
  color: var(--muted);
}

.search-input:focus {
  border-color: rgba(125, 178, 255, 0.45);
  box-shadow: 0 0 0 3px rgba(125, 178, 255, 0.08);
  background: rgba(20, 33, 62, 0.92);
}

#focusList,
#mistakeList {
  padding-left: 20px;
}

#focusList li,
#mistakeList li {
  margin-bottom: 8px;
}

@media (max-width: 1300px) {
  .main-layout {
    grid-template-columns: 360px minmax(0, 1fr);
  }
}

@media (max-width: 1100px) {
  .hero-banner {
    flex-direction: column;
  }

  .main-layout {
    grid-template-columns: 1fr;
  }

  .media-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 20px, 1720px);
    padding-top: 16px;
  }

  .hero-banner {
    padding: 20px;
    border-radius: 24px;
  }

  .hero-banner h1 {
    font-size: 2.6rem;
  }

  .headline-top,
  .media-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .detail-title {
    font-size: 2rem;
  }

  .carousel-stage {
    height: 300px;
    padding: 0 56px;
  }

  .carousel-btn {
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
  }

  #videoPrevBtn,
  #imagePrevBtn {
    left: 8px;
  }

  #videoNextBtn,
  #imageNextBtn {
    right: 8px;
  }
}