:root {
  --color-bg: #FFFFFF;
  --color-bg-alt: #F2F2F2;
  --color-surface: #FFFFFF;
  --color-navy: #16233F;
  --color-navy-dark: #0C1526;
  --color-accent: #B08D57;
  --color-accent-ink: #0A0A0A;
  --color-ink: #0A0A0A;
  --color-text: #333333;
  --color-text-muted: #6B6B6B;
  --color-border: #E2E2E2;
  --color-white: #FFFFFF;

  --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    system-ui, Roboto, "Helvetica Neue", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --wrap-width: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0 0 0.5em; font-weight: 700; letter-spacing: -0.02em; color: var(--color-ink); font-family: var(--font-serif); }
p { margin: 0 0 1em; color: var(--color-text-muted); }
a { color: inherit; text-decoration: none; }
ul { padding: 0; margin: 0; list-style: none; }

.wrap {
  max-width: var(--wrap-width);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 0.9em;
}

.section-title {
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  text-align: center;
  margin-bottom: 48px;
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.2s ease, transform 0.2s ease;
  border: 1px solid transparent;
  font-family: var(--font-sans);
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-primary { background: var(--color-accent); color: var(--color-accent-ink); }
.btn-outline { border-color: var(--color-accent); color: var(--color-ink); }

/* HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  font-family: var(--font-serif);
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text);
}
.main-nav a:hover { color: var(--color-accent); }

.nav-cta {
  padding: 9px 18px;
  background: var(--color-accent);
  color: var(--color-accent-ink) !important;
  border-radius: 4px;
}
.nav-cta:hover { opacity: 0.85; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-ink);
}

/* HERO */
.hero {
  position: relative;
  overflow: hidden;
  padding: 160px 0 120px;
  text-align: center;
  color: #FFFFFF;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.72) 65%, rgba(0,0,0,0.85) 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero h1 {
  font-size: clamp(2rem, 1.5rem + 2.2vw, 3.1rem);
  line-height: 1.28;
  margin-bottom: 0.6em;
  color: #FFFFFF;
}

.hero .eyebrow { color: var(--color-accent); }

.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 2.2em;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero .btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: #FFFFFF;
}

/* TRUST BAR */
.trust-bar {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 40px 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.trust-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.trust-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-ink);
  font-family: var(--font-serif);
}
.trust-num em { font-style: normal; font-size: 1rem; font-weight: 500; }

.trust-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

/* PROBLEM OF THE DAY */
.pod { padding: 48px 0 0; }
.pod-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 28px 30px;
  background: var(--color-surface, var(--color-bg));
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-align: center;
}
.pod-problem {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 14px;
}
.pod-answer summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  list-style: none;
}
.pod-answer summary::-webkit-details-marker { display: none; }
.pod-answer .checklist-detail { padding: 12px 0 0; text-align: left; }
.pod-answer .checklist-detail p { font-size: 0.88rem; }

/* HALL OF FAME */
.hof { padding: 60px 0 100px; background: var(--color-bg-alt); }
.hof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 640px;
  margin: 0 auto;
}
.hof-card {
  text-align: center;
  padding: 28px 16px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}
.hof-num {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-accent);
}
.hof-num em { font-style: normal; font-size: 1rem; }
.hof-label {
  display: block;
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* HUB */
.hub { padding: 100px 0; }

.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.hub-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 56px 28px 36px;
  position: relative;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.hub-card:hover {
  box-shadow: 0 12px 32px rgba(0,0,0,0.12), 0 0 0 1px rgba(176,141,87,0.25);
  transform: translateY(-2px);
}
.hub-card.is-soon { background: var(--color-bg-alt); }

.hub-badge {
  position: absolute;
  top: 20px;
  left: 20px;
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border-radius: 999px;
}
.hub-badge-live { background: #E7F0E9; color: #2F6B45; }
.hub-badge-soon { background: #EFE9DC; color: #8A6A34; }

.hub-card h3 { font-size: 1.2rem; margin-bottom: 0.5em; }
.hub-card p { font-size: 0.92rem; min-height: 66px; }

.hub-link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}
.hub-card.is-soon .hub-link { color: var(--color-accent); border-color: var(--color-accent); }

/* ABOUT */
.about { padding: 100px 0; background: var(--color-bg); }

.about-inner {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 56px;
  align-items: start;
}

.about-photo {
  aspect-ratio: 1200 / 1028;
  background: var(--color-surface);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}
.about-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about-photo-empty::after { content: "Photo"; }

.about h2 { font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem); }

.about-credential {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: -0.4em;
}

.about-quote {
  margin: 20px 0;
  padding-left: 18px;
  border-left: 3px solid var(--color-accent);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-ink);
}

.about-list {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.about-list li {
  font-size: 0.92rem;
  color: var(--color-text);
  padding-left: 20px;
  position: relative;
}
.about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* TESTIMONIALS */
.testimonials { padding: 80px 0; background: var(--color-bg-alt); }

.testimonial-grid {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 4px 4px 12px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--color-accent) transparent;
}
.testimonial-grid::-webkit-scrollbar { height: 6px; }
.testimonial-grid::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 999px; }

.testimonial-card {
  flex: 0 0 auto;
  scroll-snap-align: start;
  width: min(360px, 82vw);
  margin: 0;
  padding: 28px 26px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}
.testimonial-card p {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 16px;
}
.testimonial-card cite {
  display: block;
  font-style: normal;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* SUBSCRIBE */
.subscribe {
  padding: 100px 0;
  text-align: center;
  background: var(--color-accent);
  color: var(--color-accent-ink);
}
.subscribe h2 { color: var(--color-accent-ink); font-size: clamp(1.4rem, 1.2rem + 1vw, 1.9rem); }
.subscribe p { color: rgba(10,10,10,0.7); margin-bottom: 2em; }
.subscribe .btn-primary { background: var(--color-accent-ink); color: var(--color-accent); }

.subscribe-form {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 460px;
  margin: 0 auto;
}
.subscribe-form input {
  flex: 1;
  min-width: 220px;
  padding: 14px 16px;
  border-radius: 4px;
  border: 1px solid rgba(10,10,10,0.3);
  background: rgba(10,10,10,0.08);
  color: var(--color-accent-ink);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}
.subscribe-form input::placeholder { color: rgba(10,10,10,0.55); }

.form-note { margin-top: 14px; font-size: 0.85rem; color: rgba(10,10,10,0.75); min-height: 1.2em; }

/* FOOTER */
.site-footer { padding: 32px 0; }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}
.logo-footer { font-size: 0.95rem; }

/* NAV ACTIVE STATE */
.main-nav a.is-active { color: var(--color-accent); }

/* PAGE INTRO (books.html) */
.page-intro {
  padding: 140px 0 60px;
  text-align: center;
}
.page-intro h1 {
  font-size: clamp(1.8rem, 1.4rem + 1.8vw, 2.6rem);
}
.page-intro-sub {
  max-width: 620px;
  margin: 0 auto;
  font-size: 1rem;
}

/* SERIES SECTIONS (books.html) */
.series-section { padding: 60px 0; }
.series-section-alt { background: var(--color-bg-alt); }

.series-head {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 48px;
}
.series-head h2 { font-size: 1.6rem; }
.series-head p { font-size: 0.95rem; }

.series-tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.series-tag-live { background: #E7F0E9; color: #2F6B45; border-color: transparent; }

/* CURRICULUM ROADMAP (books.html) */
.roadmap { padding: 20px 0 60px; }

.roadmap-table {
  display: flex;
  flex-direction: column;
  max-width: 720px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.roadmap-row {
  display: grid;
  grid-template-columns: 76px 128px 1fr;
  align-items: stretch;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}
.roadmap-row:last-child { border-bottom: none; }

.roadmap-step-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 12px 6px;
  background: var(--color-bg-alt);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--color-text);
}
.roadmap-step-label span {
  margin-top: 3px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.66rem;
  color: var(--color-text-muted);
}

.roadmap-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  color: #FFFFFF;
  text-align: center;
}
.roadmap-badge span {
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.25;
}

.roadmap-badge-hc { background: var(--color-navy); }
.roadmap-badge-nje { background: #E09600; }
.roadmap-badge-mock { background: #B01743; }

.roadmap-info { padding: 12px 18px; display: flex; flex-direction: column; justify-content: center; }
.roadmap-info h3 { font-size: 0.92rem; margin-bottom: 0.2em; }
.roadmap-info p { font-size: 0.76rem; margin-bottom: 0; }

.roadmap-caption {
  text-align: center;
  margin: 24px 0 0;
  font-size: 0.9rem;
  font-style: italic;
  font-family: var(--font-serif);
  color: var(--color-text-muted);
}

@media (max-width: 480px) {
  .roadmap-row { grid-template-columns: 52px 92px 1fr; }
  .roadmap-step-label { font-size: 0.68rem; padding: 8px 3px; }
  .roadmap-step-label span { font-size: 0.56rem; }
  .roadmap-badge { padding: 8px; }
  .roadmap-badge span { font-size: 0.72rem; }
  .roadmap-info { padding: 8px 10px; }
  .roadmap-info h3 { font-size: 0.76rem; }
  .roadmap-info p { font-size: 0.64rem; }
}

/* CATEGORY BANNERS (books.html hub) */
.page-intro-sm { padding: 140px 0 40px; }

.breadcrumb-back {
  display: inline-block;
  margin-bottom: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.breadcrumb-back:hover { color: var(--color-accent); }

.category-section { padding: 20px 0 100px; }

.category-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.category-banner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 20px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.category-banner:hover {
  box-shadow: 0 12px 32px rgba(0,0,0,0.12), 0 0 0 1px rgba(176,141,87,0.25);
  transform: translateY(-2px);
}

.category-thumb {
  flex: 0 0 auto;
  width: 56px;
  aspect-ratio: 700 / 989;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}
.category-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.category-thumb-topic {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
}

.category-body { flex: 1; }
.category-body h2 { font-size: 1.15rem; margin-bottom: 0.2em; }
.category-body p { font-size: 0.85rem; margin-bottom: 0; }
.category-body .series-tag,
.category-body .hub-badge { position: static; margin: 0 0 6px; }

.category-arrow {
  flex: 0 0 auto;
  font-size: 1.2rem;
  color: var(--color-accent);
}

.category-banner-soon { opacity: 0.72; }

.book-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.book-grid-2 { grid-template-columns: repeat(2, 1fr); max-width: 620px; margin: 0 auto; }

.book-card { display: flex; flex-direction: column; }

.book-cover-img {
  width: 100%;
  aspect-ratio: 700 / 989;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 18px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}

/* CSS-built cover for HC 시리즈 (no photographed cover exists) */
.book-cover {
  aspect-ratio: 700 / 989;
  border-radius: 6px;
  background: linear-gradient(165deg, var(--color-navy), var(--color-navy-dark));
  color: var(--color-white);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
  overflow: hidden;
}

.cover-stripe {
  display: flex;
  gap: 3px;
  margin: -22px -20px 20px;
}
.cover-stripe span { flex: 1; height: 5px; }

.cover-eyebrow {
  font-family: var(--font-serif);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  margin: 0;
}
.cover-volume {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.85);
  margin: 18px 0 4px;
}
.cover-title {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0;
}
.cover-author {
  margin-top: auto;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.55);
}

.book-title {
  font-size: 1.02rem;
  margin-bottom: 0.4em;
  color: var(--color-ink);
}
.book-meta {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-muted);
}
.book-desc { font-size: 0.88rem; }

/* CRAM NOTES (족집게 노트) */
.note-toc {
  padding: 0 0 60px;
}
.note-toc ol {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 28px;
  background: var(--color-bg-alt);
  border-radius: 8px;
  columns: 2;
  gap: 24px;
  counter-reset: toc;
}
.note-toc li {
  counter-increment: toc;
  font-size: 0.9rem;
  margin-bottom: 10px;
  break-inside: avoid;
}
.note-toc li a {
  color: var(--color-text);
  font-weight: 500;
}
.note-toc li a:hover { color: var(--color-accent); }
.note-toc li::before {
  content: counter(toc) ". ";
  color: var(--color-accent);
  font-weight: 700;
}

.note-body { padding: 0 0 100px; }
.note-wrap { max-width: 760px; }

.note-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}
.note-section:last-child { border-bottom: none; }
.note-section h2 {
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.ahl-tag, .sl-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 999px;
  vertical-align: middle;
}
.ahl-tag { background: #F4EBDD; color: var(--color-accent); }
.sl-tag { background: var(--color-bg-alt); color: var(--color-text-muted); }

.checklist { display: flex; flex-direction: column; gap: 10px; }

.checklist-item {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface, var(--color-bg));
}

.checklist-item summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 40px 12px 40px;
  position: relative;
  font-size: 0.96rem;
  line-height: 1.6;
  color: var(--color-text);
}
.checklist-item summary::-webkit-details-marker { display: none; }
.checklist-item summary::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--color-accent);
  font-weight: 700;
}
.checklist-item summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 9px;
  font-size: 1.2rem;
  color: var(--color-text-muted);
}
.checklist-item[open] summary::after { content: "–"; }
.checklist-item[open] summary { border-bottom: 1px solid var(--color-border); }

.checklist-item.note-warn summary { background: var(--color-bg-alt); border-radius: 7px; }
.checklist-item.note-warn[open] summary { border-radius: 7px 7px 0 0; }
.checklist-item.note-warn summary::before { content: "!"; }

.checklist-detail { padding: 4px 20px 18px 40px; }
.checklist-detail h4 {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 14px 0 6px;
}
.checklist-detail h4:first-child { margin-top: 12px; }
.checklist-detail p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--color-text);
  margin-bottom: 0.5em;
}

.checklist-diagram {
  margin: 12px 0 4px;
  display: flex;
  justify-content: center;
}
.checklist-diagram svg {
  width: 100%;
  max-width: 200px;
  height: auto;
}

@media (max-width: 640px) {
  .note-toc ol { columns: 1; }
}

/* TOOLS PAGE */
.tool-frame-wrap {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}
.tool-frame {
  width: 100%;
  height: 480px;
  border: 0;
  display: block;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.calc-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
}
.calc-card h3 { font-size: 1.05rem; margin-bottom: 0.3em; }
.calc-formula { font-size: 0.85rem; margin-bottom: 16px; }

.calc-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}
.calc-row label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  gap: 10px;
}
.calc-row input {
  width: 100px;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-bg);
}

.calc-btn { width: 100%; padding: 10px; font-size: 0.88rem; }

.calc-result {
  margin-top: 14px;
  margin-bottom: 0;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-accent);
  min-height: 1.4em;
}

/* RESPONSIVE */
@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .main-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .main-nav a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--color-border); }
  .nav-cta { margin-top: 8px; text-align: center; border-bottom: none; }
  .nav-toggle { display: flex; }

  .trust-grid { grid-template-columns: 1fr; gap: 28px; }
  .hub-grid { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; }
  .about-photo { max-width: 340px; }
  .book-grid { grid-template-columns: 1fr; max-width: 360px; margin: 0 auto; }
  .calc-grid { grid-template-columns: 1fr; }
  .tool-frame { height: 360px; }
  .hof-grid { grid-template-columns: 1fr; max-width: 260px; }
}