/* FormulaHub Learn — light theme aligned with formulahub.io */
:root {
  --lime: #95be31;
  --teal: #125d7c;
  --navy: #0a3a52;
  --formula: #111827;
  --hub: #95be31;
  --bg: #f4f7f8;
  --bg2: #e8eef1;
  --surf: #ffffff;
  --surf2: #f0f4f6;
  --bdr: rgba(10, 58, 82, 0.12);
  --t1: #111827;
  --t2: #374151;
  --t3: #6b7280;
  --blue: #125d7c;
  --green: #95be31;
  --gold: #95be31;
  --red: #b42318;
  --purple: #16506a;
  --teal-accent: #16506a;
  --shadow: 0 1px 2px rgba(10, 58, 82, 0.06);
  --font: "Manrope", ui-sans-serif, system-ui, sans-serif;
  --display: "Manrope", ui-sans-serif, system-ui, sans-serif;
  --step: 1.125;
  --fs-body: 1.0625rem;
  --fs-small: 0.9375rem;
  --fs-h1: 2rem;
  --fs-h2: 1.35rem;
  --fs-label: 0.75rem;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(149, 190, 49, 0.14), transparent 55%),
    radial-gradient(900px 420px at 100% 0%, rgba(18, 93, 124, 0.1), transparent 50%),
    linear-gradient(180deg, #f7fafb 0%, var(--bg) 40%, #eef3f5 100%);
  color: var(--t1);
  min-height: 100vh;
  font-size: var(--fs-body);
  line-height: 1.65;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--teal);
}

a:hover {
  color: var(--navy);
}

#fh-learn-cta {
  background: linear-gradient(90deg, #125d7c, #16506a 45%, #95be31);
  color: #fff;
  padding: 10px 16px;
  font-size: var(--fs-small);
  font-weight: 600;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 200;
}

#fh-learn-cta a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.top {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--bdr);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  position: sticky;
  top: 40px;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: block;
}

.bn {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--formula);
  text-decoration: none;
}

.bn .formula,
.formula {
  color: var(--formula);
}

.bn .hub,
.hub {
  color: var(--hub);
}

a.brand {
  text-decoration: none;
  color: inherit;
}

.bt {
  font-size: 0.8rem;
  color: var(--t3);
  letter-spacing: 0;
}

.pw {
  display: none;
  align-items: center;
  gap: 8px;
}

body.show-progress .pw {
  display: flex;
}

.pl {
  font-size: 0.8rem;
  color: var(--t3);
}

.pb {
  width: 130px;
  height: 5px;
  background: var(--bg2);
  border-radius: 3px;
  overflow: hidden;
}

.pf {
  height: 100%;
  background: var(--lime);
  border-radius: 3px;
  transition: width 0.4s;
}

.nav {
  background: var(--surf);
  border-bottom: 1px solid var(--bdr);
  overflow-x: auto;
  scrollbar-width: none;
  position: sticky;
  top: 104px;
  z-index: 99;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nw {
  display: inline-flex;
  padding: 8px 16px;
  gap: 4px;
  white-space: nowrap;
}

.nt {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  color: var(--t3);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  background: transparent;
}

.nt:hover {
  background: var(--surf2);
  color: var(--t1);
}

.nt.on {
  background: rgba(149, 190, 49, 0.14);
  border-color: rgba(149, 190, 49, 0.45);
  color: var(--navy);
}

.nd {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
  flex-shrink: 0;
}

.main {
  padding: 24px 20px 64px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.sec {
  display: none;
}

.sec.on {
  display: block;
  animation: fi 0.25s ease;
}

@keyframes fi {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}

.hbadge {
  display: inline-block;
  background: rgba(149, 190, 49, 0.14);
  border: 1px solid rgba(149, 190, 49, 0.4);
  color: var(--navy);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero h1,
.enc-hero h1 {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3vw, var(--fs-h1));
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.2;
  margin-bottom: 10px;
  color: var(--t1);
}

.hero h1 span,
.enc-hero h1 span {
  color: var(--teal);
}

.hero p,
.enc-hero p {
  color: var(--t2);
  font-size: var(--fs-body);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 18px;
}

.stats {
  display: none;
}

.stn {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--teal);
}

.stl {
  font-size: 0.75rem;
  color: var(--t3);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.sh {
  font-family: var(--display);
  font-size: var(--fs-h2);
  font-weight: 600;
  letter-spacing: 0;
  margin: 0 0 6px;
  color: var(--t1);
}

.ss {
  font-size: var(--fs-small);
  color: var(--t2);
  margin-bottom: 16px;
}

.rgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.rcard {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 12px;
  padding: 14px;
  cursor: pointer;
  transition: border-color 0.16s, transform 0.16s;
}

.rcard:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.ri {
  font-size: 20px;
  margin-bottom: 6px;
}

.rt {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.rd {
  font-size: 0.85rem;
  color: var(--t2);
  line-height: 1.5;
}

.rbdg {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.acc {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
}

.ah {
  padding: 14px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: background 0.13s;
  user-select: none;
}

.ah:hover {
  background: var(--surf2);
}

.ah.open {
  border-bottom: 1px solid var(--bdr);
}

.ai {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}

.at {
  font-size: 0.95rem;
  font-weight: 700;
  flex: 1;
  color: var(--t1);
}

.as {
  font-size: 0.85rem;
  color: var(--t2);
  margin-top: 2px;
}

.ar {
  font-size: 16px;
  color: var(--t3);
  transition: transform 0.22s;
  flex-shrink: 0;
}

.ah.open .ar {
  transform: rotate(180deg);
}

.ab {
  display: none;
  padding: 16px 18px;
}

.ab.open {
  display: block;
  animation: fi 0.18s ease;
}

.ib {
  border-radius: 8px;
  padding: 12px 15px;
  margin: 9px 0;
  font-size: var(--fs-small);
  line-height: 1.65;
  border-left: 3px solid;
  color: var(--t2);
}

.ib strong {
  font-weight: 700;
  display: block;
  margin-bottom: 3px;
  color: var(--t1);
}

.ib.key {
  background: rgba(149, 190, 49, 0.1);
  border-color: var(--lime);
}

.ib.tip {
  background: rgba(18, 93, 124, 0.08);
  border-color: var(--teal);
}

.ib.warn {
  background: rgba(180, 35, 24, 0.06);
  border-color: var(--red);
}

.ib.info {
  background: rgba(22, 80, 106, 0.08);
  border-color: var(--teal-accent);
}

.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-small);
  margin: 9px 0;
}

.tbl th {
  background: rgba(18, 93, 124, 0.06);
  color: var(--navy);
  padding: 8px 11px;
  text-align: left;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--bdr);
}

.tbl td {
  padding: 8px 11px;
  border-bottom: 1px solid var(--bdr);
  color: var(--t2);
  vertical-align: top;
  line-height: 1.5;
}

.tbl tr:hover td {
  background: var(--surf2);
}

.tbl .tl {
  color: var(--t1);
  font-weight: 700;
}

.code {
  background: #0f2430;
  border: 1px solid rgba(10, 58, 82, 0.2);
  border-radius: 8px;
  padding: 13px 16px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.8rem;
  line-height: 1.8;
  overflow-x: auto;
  margin: 9px 0;
  position: relative;
  white-space: pre;
  color: #e8eef1;
  max-width: 100%;
}

.kw {
  color: #c4b5fd;
}
.str {
  color: #c3e88d;
}
.cm {
  color: #8aa0ad;
}
.fn {
  color: #93c5fd;
}
.num {
  color: #f0ab8d;
}

.cpb {
  position: absolute;
  top: 7px;
  right: 7px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #d1d5db;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  cursor: pointer;
  font-family: var(--font);
}

.cpb:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
}

.flow {
  background: var(--surf2);
  border-radius: 10px;
  padding: 16px;
  margin: 9px 0;
  overflow-x: auto;
}

.flow-title {
  font-size: 0.8rem;
  color: var(--t2);
  margin-bottom: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.frow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
  margin: 6px 0;
}

.fb {
  padding: 8px 12px;
  border-radius: 7px;
  font-size: 0.8rem;
  font-weight: 700;
  text-align: center;
  min-width: 70px;
  border: 1px solid transparent;
}

.fa {
  color: var(--t3);
  font-size: 16px;
  padding: 0 5px;
  flex-shrink: 0;
}

.fb.s {
  background: rgba(149, 190, 49, 0.12);
  border-color: rgba(149, 190, 49, 0.35);
  color: #3f6212;
}
.fb.p {
  background: rgba(18, 93, 124, 0.1);
  border-color: rgba(18, 93, 124, 0.3);
  color: var(--teal);
}
.fb.st {
  background: rgba(22, 80, 106, 0.1);
  border-color: rgba(22, 80, 106, 0.3);
  color: var(--navy);
}
.fb.o {
  background: rgba(149, 190, 49, 0.12);
  border-color: rgba(149, 190, 49, 0.35);
  color: #3f6212;
}
.fb.cl {
  background: rgba(18, 93, 124, 0.1);
  border-color: rgba(18, 93, 124, 0.3);
  color: var(--teal);
}
.fb.r {
  background: rgba(180, 35, 24, 0.08);
  border-color: rgba(180, 35, 24, 0.3);
  color: var(--red);
}

.scene {
  background: var(--surf2);
  border-left: 3px solid var(--lime);
  border-radius: 0 8px 8px 0;
  padding: 12px 15px;
  margin: 10px 0;
}

.scene-t {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 5px;
}

.scene-d {
  font-size: var(--fs-small);
  color: var(--t2);
  line-height: 1.7;
}

.step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--surf2);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 8px;
}

.stepn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--lime);
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.stept {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 3px;
}

.stepd {
  font-size: 0.85rem;
  color: var(--t2);
  line-height: 1.6;
}

.qi {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 8px;
  margin-bottom: 7px;
  overflow: hidden;
}

.qq {
  padding: 12px 15px;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.5;
  user-select: none;
  color: var(--t1);
}

.qq:hover {
  background: var(--surf2);
}

.qic {
  width: 20px;
  height: 20px;
  background: rgba(149, 190, 49, 0.18);
  color: var(--navy);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 900;
  flex-shrink: 0;
  margin-top: 1px;
}

.qt {
  color: var(--t3);
  font-size: 15px;
  flex-shrink: 0;
  margin-left: auto;
  transition: transform 0.22s;
  padding-left: 8px;
}

.qi.open .qt {
  transform: rotate(45deg);
  color: var(--lime);
}

.qa {
  display: none;
  padding: 4px 15px 13px 44px;
  font-size: var(--fs-small);
  color: var(--t2);
  line-height: 1.75;
  border-top: 1px solid var(--bdr);
}

.qi.open .qa {
  display: block;
}

.ck {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 0;
  border-bottom: 1px solid var(--bdr);
  cursor: pointer;
}

.ck:hover {
  padding-left: 4px;
  transition: padding 0.13s;
}

.cb {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  border: 1.5px solid var(--t3);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 10px;
  transition: all 0.16s;
}

.ck.done .cb {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--navy);
}

.ck.done .cl {
  color: var(--t3);
  text-decoration: line-through;
}

.cl {
  font-size: var(--fs-small);
}

.cat-head {
  font-family: var(--display);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 18px 0 6px;
  color: var(--t1);
  letter-spacing: 0;
}

.progress-summary {
  background: var(--surf2);
  border-radius: 10px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.qcat {
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 18px 0 7px;
}

.enc-hero {
  background: linear-gradient(135deg, rgba(149, 190, 49, 0.12) 0%, rgba(18, 93, 124, 0.08) 100%);
  border: 1px solid rgba(18, 93, 124, 0.15);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 20px;
}

.enc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  margin: 16px 0;
}

.enc-card {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 12px;
  padding: 14px 12px;
  cursor: pointer;
  transition: all 0.16s;
  text-align: center;
}

.enc-card:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
  background: var(--surf2);
}

.enc-card.active {
  border-color: var(--lime);
  background: rgba(149, 190, 49, 0.1);
}

.enc-icon {
  font-size: 24px;
  margin-bottom: 6px;
}

.enc-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--t1);
  margin-bottom: 3px;
}

.enc-cat {
  font-size: 0.7rem;
  color: var(--t3);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.enc-detail {
  display: none;
  background: var(--surf);
  border: 1px solid rgba(18, 93, 124, 0.18);
  border-radius: 12px;
  padding: 22px;
  margin-top: 12px;
  animation: fi 0.2s ease;
}

.enc-detail.show {
  display: block;
}

.enc-detail-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.enc-detail-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  flex-shrink: 0;
}

.enc-title {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--t1);
  letter-spacing: 0;
}

.enc-subtitle {
  font-size: var(--fs-small);
  color: var(--t2);
  margin-top: 3px;
}

.enc-section {
  margin: 16px 0;
}

.enc-section-head {
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--bdr);
}

.enc-body {
  font-size: var(--fs-body);
  color: var(--t2);
  line-height: 1.75;
}

.enc-body p {
  margin-bottom: 10px;
}

.enc-body strong {
  color: var(--t1);
  font-weight: 700;
}

.comp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin: 10px 0;
}

.comp-card {
  background: var(--surf2);
  border: 1px solid var(--bdr);
  border-radius: 8px;
  padding: 12px;
}

.comp-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--t1);
  margin-bottom: 4px;
}

.comp-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.comp-desc {
  font-size: 0.85rem;
  color: var(--t2);
  line-height: 1.55;
}

.why-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.why-box {
  flex: 1;
  min-width: 150px;
  background: var(--surf2);
  border-radius: 8px;
  padding: 12px;
  border-left: 3px solid var(--lime);
}

.why-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 5px;
}

.why-text {
  font-size: var(--fs-small);
  color: var(--t2);
  line-height: 1.6;
}

.analogy-box {
  background: rgba(18, 93, 124, 0.06);
  border: 1px solid rgba(18, 93, 124, 0.15);
  border-radius: 8px;
  padding: 14px;
  margin: 10px 0;
}

.analogy-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.analogy-text {
  font-size: var(--fs-body);
  color: var(--t2);
  line-height: 1.7;
}

.usecase-list {
  list-style: none;
  margin: 8px 0;
}

.usecase-list li {
  font-size: var(--fs-small);
  color: var(--t2);
  padding: 5px 0;
  border-bottom: 1px solid var(--bdr);
  display: flex;
  gap: 8px;
  align-items: flex-start;
  line-height: 1.55;
}

.usecase-list li::before {
  content: "→";
  color: var(--lime);
  flex-shrink: 0;
  font-weight: 700;
}

.enc-cat-filter {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 0 0 14px;
}

.ecf {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--bdr);
  color: var(--t3);
  transition: all 0.15s;
  background: var(--surf);
}

.ecf:hover {
  color: var(--t1);
  border-color: var(--t3);
}

.ecf.on {
  background: rgba(149, 190, 49, 0.14);
  border-color: rgba(149, 190, 49, 0.45);
  color: var(--navy);
}

/* Studio guides */
#studioRoot {
  min-width: 0;
}

.sg-hero {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 18px;
  padding: clamp(22px, 4vw, 36px);
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.sg-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(149, 190, 49, 0.12), transparent 42%),
    linear-gradient(225deg, rgba(18, 93, 124, 0.1), transparent 40%);
  pointer-events: none;
}

.sg-hero > * {
  position: relative;
}

.sg-label {
  display: inline-block;
  font-size: var(--fs-label);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--navy);
  background: rgba(149, 190, 49, 0.16);
  border: 1px solid rgba(149, 190, 49, 0.35);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.sg-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
  align-items: center;
}

.sg-hero-copy {
  min-width: 0;
}

.sg-hero-visual {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.sg-pipe-svg {
  width: 100%;
  max-width: 360px;
  height: auto;
  display: block;
}

.sg-pipe-caption {
  font-size: 0.8rem;
  color: var(--t3);
  text-align: center;
  line-height: 1.4;
}

.sg-brandline {
  font-family: var(--display);
  font-size: clamp(1.85rem, 4.2vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 12px;
  color: var(--formula);
}

.sg-h1 {
  font-family: var(--display);
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 12px;
  color: var(--t1);
}

.sg-h2 {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 22px 0 10px;
  color: var(--t1);
}

@media (max-width: 820px) {
  .sg-hero-grid {
    grid-template-columns: 1fr;
  }
}

.sg-formula {
  color: var(--formula);
}

.sg-hub {
  color: var(--hub);
}

.sg-lead {
  font-size: 1.125rem;
  color: var(--t2);
  line-height: 1.7;
  max-width: 40rem;
  margin-bottom: 18px;
}

.sg-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.sg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: 10px;
  font-size: var(--fs-small);
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font);
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.sg-btn:active {
  transform: translateY(1px);
}

.sg-btn-primary {
  background: var(--lime);
  color: var(--navy);
}

.sg-btn-primary:hover {
  background: #86ad2a;
  color: var(--navy);
}

.sg-btn-ghost {
  background: var(--surf);
  border-color: var(--bdr);
  color: var(--t1);
}

.sg-btn-ghost:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.sg-note {
  font-size: var(--fs-small);
  color: var(--t3);
  margin-top: 8px;
}

.sg-tools {
  margin-bottom: 18px;
}

.sg-search-wrap {
  display: block;
  margin-bottom: 12px;
}

.sg-search {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--bdr);
  background: var(--surf);
  color: var(--t1);
  font-size: var(--fs-body);
  font-family: var(--font);
}

.sg-search:focus {
  outline: 2px solid rgba(149, 190, 49, 0.45);
  border-color: var(--lime);
}

.sg-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sg-chip {
  padding: 7px 12px;
  border-radius: 8px;
  border: 1px solid var(--bdr);
  background: var(--surf);
  color: var(--t2);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
}

.sg-chip.on,
.sg-chip:hover {
  border-color: rgba(149, 190, 49, 0.5);
  background: rgba(149, 190, 49, 0.14);
  color: var(--navy);
}

.sg-section {
  margin-bottom: 28px;
}


.sg-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

@media (min-width: 720px) {
  .sg-grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 28px;
  }
}

.sg-card {
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 1px solid var(--bdr);
  border-radius: 0;
  padding: 14px 4px 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  box-shadow: none;
  transition: background 0.18s ease, border-color 0.18s ease, padding 0.18s ease;
  font-family: var(--font);
  color: inherit;
}

.sg-card:hover {
  background: rgba(149, 190, 49, 0.08);
  border-color: transparent;
  border-bottom-color: rgba(149, 190, 49, 0.45);
  padding-left: 10px;
  padding-right: 10px;
}

.sg-card-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.sg-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--t1);
  line-height: 1.3;
}

.sg-card-sum {
  font-size: var(--fs-small);
  color: var(--t2);
  line-height: 1.55;
}

.sg-article {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-radius: 16px;
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--shadow);
  min-width: 0;
}

.sg-p {
  font-size: 1.0625rem;
  color: var(--t2);
  line-height: 1.75;
  margin-bottom: 14px;
}

.sg-ol,
.sg-ul {
  margin: 0 0 16px 1.2rem;
  color: var(--t2);
  font-size: 1.0625rem;
  line-height: 1.7;
}

.sg-ol li,
.sg-ul li {
  margin-bottom: 8px;
  padding-left: 4px;
}

.sg-back {
  margin-bottom: 14px;
}

.sg-empty {
  color: var(--t3);
  padding: 20px 0;
}

.sg-inline-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sg-pill {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--surf2);
  border: 1px solid var(--bdr);
  font-size: 0.85rem;
  color: var(--t1);
  font-weight: 600;
}

@keyframes sgRise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.sg-hero,
.sg-card,
.sg-article {
  animation: sgRise 0.45s ease both;
}

.sg-card:nth-child(2) {
  animation-delay: 0.04s;
}
.sg-card:nth-child(3) {
  animation-delay: 0.08s;
}
.sg-card:nth-child(4) {
  animation-delay: 0.12s;
}

@media (max-width: 720px) {
  .top {
    top: 0;
  }
  #fh-learn-cta {
    position: relative;
  }
  .nav {
    top: 64px;
  }
  .main {
    padding: 16px 14px 48px;
  }
  .hero,
  .enc-hero,
  .sg-hero,
  .sg-article {
    padding: 18px;
    border-radius: 14px;
  }
  .sg-grid {
    grid-template-columns: 1fr;
  }
  .nw {
    padding: 8px 10px;
  }
  .tbl {
    display: block;
    overflow-x: auto;
  }
}

@media (max-width: 420px) {
  .bn {
    font-size: 1.1rem;
  }
  .pw {
    width: 100%;
  }
  .pb {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sg-hero,
  .sg-card,
  .sg-article,
  .sec.on,
  .ab.open {
    animation: none;
  }
}