/* ============================================================================
   數博 Math Blocks — case study theme. Navy + terracotta, playful education.
   Mascot warmth, calligraphic confidence. Scoped to .mbcase.
   ============================================================================ */
.mbcase {
  --mb-navy: #1d3a63;
  --mb-navy-deep: #14274a;
  --mb-terra: #c9683b;       /* brick red / terracotta */
  --mb-terra-soft: #e0875c;
  --mb-gold: #e9a23b;        /* mascot golden-orange */
  --mb-ink: #21304a;
  --mb-text: #54607a;
  --mb-sand: #f3ece0;        /* warm paper */
  --mb-cream: #faf6ef;
  --mb-line: rgba(29,58,99,.12);
  position: relative; overflow: hidden; background: #fff;
  font-family: var(--font-sans); color: var(--mb-text);
}
.mbcase .wrap { position: relative; z-index: 1; }

/* ---- shared type ---- */
.mbcase .mbchapter { display: flex; align-items: baseline; gap: 16px; margin: 0 0 22px; }
.mbcase .mbchapter__no { font-family: var(--font-display); font-weight: 800; font-size: clamp(2rem,1.4rem + 2vw,3.2rem);
  line-height: 0.9; color: var(--mb-terra); letter-spacing: -0.03em; }
.mbsec--navy .mbchapter__no, .mbsec--terra .mbchapter__no { color: rgba(255,255,255,.45); }
.mbcase .mbeyebrow { font-family: var(--font-mono); font-size: 12.5px; font-weight: 600; letter-spacing: .16em;
  text-transform: uppercase; color: var(--mb-terra); margin: 0; padding-top: 8px; }
.mbsec--navy .mbeyebrow, .mbsec--terra .mbeyebrow { color: var(--mb-gold); }
.mbcase .mbh2 { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.7rem,1.2rem + 2vw,2.8rem);
  line-height: 1.2; letter-spacing: -0.02em; color: var(--mb-navy); margin: 0 0 24px; text-wrap: balance; }
.mbh2--on { color: #fff; }
.mbcase__p { font-size: clamp(15.5px,1vw,17px); line-height: 1.95; color: var(--mb-text); margin: 0 0 20px; }
.mbcase__p:last-child { margin-bottom: 0; }
.mbsec--navy .mbcase__p, .mbsec--terra .mbcase__p { color: rgba(255,255,255,.84); }
.mbcase .mbcol { max-width: 760px; }

/* sections + spacing */
.mbsec { padding-block: clamp(3.5rem, 2rem + 5vw, 7rem); }
.mbcase .pb-gap { padding-bottom: clamp(2.5rem, 1.5rem + 4vw, 5rem); }
.mbcase .mt-gap { margin-top: clamp(1.5rem, 1rem + 2vw, 3rem); }
.mbcase .mbshot, .mbcase [class*="__fig"], .mbcase [class*="__media"] { margin-block: 1rem; }
.mbsec--sand { background: var(--mb-sand); }
.mbsec--cream { background: var(--mb-cream); }
.mbsec--navy { background: var(--mb-navy); }
.mbsec--terra { background: linear-gradient(150deg, var(--mb-terra) 0%, var(--mb-navy) 120%); }

/* ---- Hero ---- */
.mbhero { position: relative; overflow: hidden; padding-block: clamp(1.5rem,1rem + 2vw,2.5rem) 0; background: var(--mb-cream); }
.mbhero__logo { position: relative; z-index: 1; display: block; height: clamp(92px, 11vw, 124px); width: auto; margin-bottom: clamp(1.5rem, 1rem + 2vw, 2.5rem); }
.mbback { appearance: none; background: none; border: 0; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans); font-size: 14px; font-weight: 500; color: var(--mb-text); margin-bottom: calc(34px + 1.6rem); transition: color var(--dur-fast); }
.mbback:hover { color: var(--mb-terra); }
.mbback [data-lucide] { width: 16px; height: 16px; }
.mbhero__kicker { display: flex; align-items: center; gap: 14px; margin-bottom: 26px; flex-wrap: wrap; }
.mbchip { display: inline-flex; font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: .08em;
  padding: 6px 14px; border-radius: 999px; color: #fff; background: var(--mb-terra); }
.mbhero__cat { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--mb-navy); }
.mbhero__year { font-family: var(--font-mono); font-size: 13px; color: var(--mb-text); }
.mbhero__lede { font-family: var(--font-display); font-weight: 800; font-size: clamp(2rem,1.3rem + 3vw,3.8rem);
  line-height: 1.12; letter-spacing: -0.03em; color: var(--mb-navy); margin: 0; max-width: 1000px; text-wrap: balance; }
.mbhero__sub { font-size: clamp(15.5px,1vw,17.5px); line-height: 1.75; color: var(--mb-text); margin: 28px 0 0; max-width: 760px; }
.mbhero__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.mbtag { font-family: var(--font-mono); font-size: 11.5px; font-weight: 500; letter-spacing: .04em; color: var(--mb-navy);
  background: #fff; border: 1px solid var(--mb-line); border-radius: 999px; padding: 6px 12px; }
.mbhero__media { margin-top: clamp(2.5rem,2rem + 3vw,4rem); border-radius: var(--radius-2xl) var(--radius-2xl) 0 0; overflow: hidden;
  box-shadow: 0 -0 0; border: 1px solid var(--mb-line); border-bottom: 0; }
.mbhero__media img { width: 100%; height: auto; display: block; }

/* headline stat band */
.mbheadstats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: clamp(2.5rem,2rem + 3vw,4rem);
  background: var(--mb-line); border: 1px solid var(--mb-line); border-radius: var(--radius-xl); overflow: hidden; }
.mbheadstat { background: var(--mb-cream); padding: clamp(22px,2.4vw,34px) 20px; text-align: center; }
.mbheadstat__num { display: block; font-family: var(--font-display); font-weight: 800; font-size: clamp(1.9rem,1.3rem + 2vw,3rem);
  line-height: 1; letter-spacing: -0.02em; color: var(--mb-terra); }
.mbheadstat__label { display: block; font-size: 12.5px; color: var(--mb-text); margin-top: 10px; font-family: var(--font-mono); letter-spacing: .04em; }

/* ---- generic figure ---- */
.mbshot { border-radius: var(--radius-xl); overflow: hidden; background: #fff;
  box-shadow: 0 28px 60px -34px rgba(29,58,99,.4); border: 1px solid var(--mb-line); }
.mbshot img { width: 100%; height: auto; display: block; }
.mbshot__cap { display: flex; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 12px; color: var(--mb-text);
  padding: 14px 18px; background: var(--mb-cream); border-top: 1px solid var(--mb-line); }
.mbshot__cap::before { content: ""; width: 22px; height: 1px; background: var(--mb-terra); flex: none; }
.mbgallery { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(18px,2vw,26px); }
.mbgallery .mbshot { margin: 0; }

/* old logo callout */
.mbold { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; margin-top: clamp(2rem,1.5rem + 2vw,3rem);
  background: var(--mb-sand); border: 1px dashed var(--mb-line); border-radius: var(--radius-xl); padding: 22px 26px; }
.mbold img { height: 72px; width: auto; border-radius: var(--radius-sm); }
.mbold span { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--mb-text); }

/* ---- Challenge question ---- */
.mbquestion { margin-top: clamp(2rem,1.5rem + 2vw,3rem); padding: clamp(28px,3vw,48px); background: var(--mb-navy); border-radius: var(--radius-2xl); }
.mbquestion__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--mb-gold); margin: 0 0 16px; }
.mbquestion__text { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.5rem,1.1rem + 1.8vw,2.4rem);
  line-height: 1.3; color: #fff; margin: 0; letter-spacing: -0.02em; text-wrap: balance; }

/* ---- CIV framework ---- */
.mbciv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: clamp(2.5rem,2rem + 3vw,4rem); }
.mbcivcard { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16); border-radius: var(--radius-2xl); padding: 32px 28px; }
.mbcivcard__key { font-family: var(--font-display); font-weight: 800; font-size: clamp(3rem,2rem + 3vw,4.5rem); line-height: 0.85;
  color: var(--mb-gold); letter-spacing: -0.04em; margin-bottom: 16px; }
.mbcivcard__word { font-family: var(--font-display); font-weight: 700; font-size: 20px; color: #fff; margin: 0 0 10px; }
.mbcivcard__d { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,.78); margin: 0; }
.mbtaglines { margin-top: clamp(2rem,1.5rem + 2vw,3rem); }
.mbtaglines__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--mb-gold); margin: 0 0 18px; }
.mbtaglines__list { display: flex; flex-wrap: wrap; gap: 12px; }
.mbtagline { font-family: var(--font-display); font-weight: 600; font-size: clamp(15px,1.1vw,18px); color: #fff;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16); border-radius: 999px; padding: 10px 20px; }

/* ---- Logo glances ---- */
.mbglances { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: clamp(2rem,1.5rem + 2vw,3rem); }
.mbglance { background: var(--mb-sand); border: 1px solid var(--mb-line); border-radius: var(--radius-xl); padding: 26px 28px; }
.mbglance__n { font-family: var(--font-mono); font-weight: 700; font-size: 13px; color: var(--mb-terra); }
.mbglance__t { font-family: var(--font-display); font-weight: 700; font-size: 18px; color: var(--mb-navy); margin: 10px 0 8px; }
.mbglance__d { font-size: 14px; line-height: 1.65; color: var(--mb-text); margin: 0; }
.mbsysnote { font-family: var(--font-mono); font-size: 12.5px; color: var(--mb-text); margin-top: 18px; display: flex; align-items: flex-start; gap: 10px; line-height: 1.6; }
.mbsysnote [data-lucide] { width: 16px; height: 16px; color: var(--mb-terra); flex: none; margin-top: 2px; }

/* ---- IP characters ---- */
.mbchars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: clamp(2rem,1.5rem + 2vw,3rem); }
.mbchar { background: #fff; border: 1px solid var(--mb-line); border-radius: var(--radius-2xl); padding: 28px 26px;
  border-top: 4px solid var(--mb-gold); }
.mbchar:nth-child(2) { border-top-color: var(--mb-terra); }
.mbchar:nth-child(3) { border-top-color: var(--mb-navy); }
.mbchar__name { font-family: var(--font-display); font-weight: 800; font-size: 22px; color: var(--mb-navy); margin: 0 0 4px; }
.mbchar__tag { font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--mb-terra); }
.mbchar__d { font-size: 14px; line-height: 1.7; color: var(--mb-text); margin: 14px 0 0; }
.mbusage { margin-top: clamp(1.5rem,1rem + 2vw,2.5rem); }
.mbusage__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--mb-text); margin: 0 0 14px; }
.mbusage__list { display: flex; flex-wrap: wrap; gap: 10px; }
.mbusage__list span { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--mb-navy);
  background: var(--mb-sand); border-radius: 999px; padding: 8px 16px; }
.mbusage__list span::before { content: ""; width: 6px; height: 6px; border-radius: 999px; background: var(--mb-gold); }

/* ---- Website audiences ---- */
.mbaud { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: clamp(2rem,1.5rem + 2vw,3rem); }
.mbaudcard { background: #fff; border: 1px solid var(--mb-line); border-radius: var(--radius-xl); padding: 28px 26px; border-top: 3px solid var(--mb-terra); }
.mbaudcard__ic { width: 46px; height: 46px; border-radius: var(--radius-md); display: grid; place-items: center; background: var(--mb-sand); color: var(--mb-terra); margin-bottom: 16px; }
.mbaudcard__ic [data-lucide] { width: 22px; height: 22px; }
.mbaudcard b { display: block; font-family: var(--font-display); font-weight: 700; font-size: 16px; color: var(--mb-navy); margin-bottom: 10px; }
.mbaudcard p { font-size: 13.5px; line-height: 1.65; color: var(--mb-text); margin: 0; }

/* ---- What we built table ---- */
.mbtable { margin-top: clamp(2rem,1.5rem + 2vw,3rem); border: 1px solid var(--mb-line); border-radius: var(--radius-xl); overflow: hidden; }
.mbtable__row { display: grid; grid-template-columns: 0.8fr 1.4fr; gap: 16px; padding: 16px 22px; border-bottom: 1px solid var(--mb-line); }
.mbtable__row:last-child { border-bottom: 0; }
.mbtable__row:nth-child(even) { background: var(--mb-cream); }
.mbtable__k { font-family: var(--font-mono); font-size: 13px; color: var(--mb-terra); text-transform: uppercase; letter-spacing: .04em; font-weight: 600; }
.mbtable__v { font-size: 14.5px; color: var(--mb-navy); }

/* ---- Insight quote ---- */
.mbinsight { max-width: 880px; margin: 0 auto; text-align: center; }
.mbinsight__mark { font-family: var(--font-display); font-size: 80px; line-height: .5; color: var(--mb-gold); }
.mbinsight__quote { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.6rem,1.2rem + 2vw,2.6rem);
  line-height: 1.32; color: #fff; margin: 8px 0 28px; letter-spacing: -0.02em; text-wrap: balance; }
.mbinsight__body { font-size: clamp(14.5px,1vw,16px); line-height: 1.9; color: rgba(255,255,255,.85); margin: 0 auto; max-width: 680px; text-align: left; }

/* ---- CTA ---- */
.mbcta { position: relative; background: var(--mb-navy); padding-top: clamp(2.5rem, 1.5rem + 4vw, 5rem); padding-bottom: clamp(2.5rem, 1.5rem + 4vw, 5rem); text-align: center; overflow: hidden; }
.mbcta__inner { position: relative; z-index: 1; }
.mbcta__title { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.7rem,1.2rem + 2vw,2.7rem); color: #fff; margin: 0 0 28px; text-wrap: balance; }
.mbbtn { appearance: none; cursor: pointer; display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-sans);
  font-weight: 600; font-size: 16px; color: #fff; background: var(--mb-terra); border: 0; height: 56px; padding: 0 30px;
  border-radius: 999px; box-shadow: 0 16px 32px -14px rgba(201,104,59,.6); transition: all var(--dur-base) var(--ease-out); }
.mbbtn:hover { transform: translateY(-2px); background: var(--mb-terra-soft); }
.mbbtn [data-lucide] { width: 18px; height: 18px; }

@media (max-width: 880px) {
  .mbheadstats { grid-template-columns: 1fr 1fr; }
  .mbciv, .mbchars, .mbaud { grid-template-columns: 1fr; }
  .mbglances { grid-template-columns: 1fr; }
  .mbgallery { grid-template-columns: 1fr; }
  .mbtable__row { grid-template-columns: 1fr; gap: 4px; }
}
@media (max-width: 520px) { .mbheadstats { grid-template-columns: 1fr; } }