:root {
  --ink: #17202a;
  --muted: #596879;
  --paper: #f7f8f7;
  --panel: #ffffff;
  --line: #d9dfdf;
  --green: #2f8f70;
  --blue: #315f8f;
  --gold: #a87b2d;
  --charcoal: #0f1820;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 4vw, 64px);
  background: rgba(247, 248, 247, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: white;
  background: var(--charcoal);
  border: 3px solid var(--green);
  font-size: 16px;
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

nav a {
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  min-height: calc(100vh - 82px);
  padding: clamp(48px, 7vw, 96px) clamp(20px, 5vw, 80px);
  background:
    linear-gradient(90deg, rgba(247, 248, 247, 0.94), rgba(247, 248, 247, 0.74)),
    url("assets/brief-intro-tim-cover.jpg") center right / cover no-repeat;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 20px;
  font-size: clamp(56px, 9vw, 118px);
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  font-size: 22px;
  line-height: 1.15;
}

.lede {
  max-width: 720px;
  color: #263645;
  font-size: clamp(20px, 2.3vw, 30px);
  line-height: 1.3;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--charcoal);
  text-decoration: none;
  font-weight: 800;
}

.button.primary {
  color: #fff;
  background: var(--charcoal);
}

.hero-visual {
  position: relative;
  width: min(100%, 560px);
  aspect-ratio: 1;
  margin-inline: auto;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  box-shadow: 0 24px 70px rgba(15, 24, 32, 0.14);
}

.hero-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.statement-band {
  padding: 34px clamp(20px, 5vw, 80px);
  color: #fff;
  background: var(--charcoal);
}

.statement-band p {
  max-width: 1160px;
  margin: 0 auto;
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.35;
}

.section,
.book-section,
.programs {
  padding: clamp(52px, 7vw, 96px) clamp(20px, 5vw, 80px);
}

.section-heading {
  max-width: 900px;
  margin-bottom: 34px;
}

.principles,
.program-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.principles article,
.program-grid article,
.cert-ladder article {
  min-height: 230px;
  padding: 26px;
  background: var(--panel);
}

.principles span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
}

.book-section {
  display: grid;
  grid-template-columns: minmax(240px, 380px) minmax(0, 760px);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
  background: #e9eeee;
}

.book-cover img {
  display: block;
  width: 100%;
  border: 1px solid #c9d0d0;
  box-shadow: 0 24px 54px rgba(15, 24, 32, 0.18);
}

.check-list {
  display: grid;
  gap: 9px;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding-left: 26px;
  background: linear-gradient(var(--green), var(--green)) 0 0.75em / 12px 3px no-repeat;
}

.note {
  color: var(--muted);
  font-weight: 700;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
}

.cert-ladder {
  display: grid;
  gap: 14px;
}

.cert-ladder article {
  min-height: 148px;
  border-left: 8px solid var(--blue);
}

.programs {
  color: #fff;
  background: #17202a;
}

.programs .eyebrow {
  color: #8ee2b5;
}

.program-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 28px;
}

.program-grid article {
  color: var(--ink);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 5vw, 80px);
  color: var(--muted);
  background: #fff;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
}

.site-footer .brand-family {
  width: 100%;
  font-size: 0.85rem;
  opacity: 0.85;
}

.site-footer .brand-family a {
  color: inherit;
}

@media (max-width: 980px) {
  .site-header,
  .hero,
  .book-section,
  .split {
    grid-template-columns: 1fr;
  }

  .site-header {
    align-items: flex-start;
  }

  .hero {
    min-height: auto;
    background:
      linear-gradient(90deg, rgba(247, 248, 247, 0.96), rgba(247, 248, 247, 0.88)),
      url("assets/brief-intro-tim-cover.jpg") center / cover no-repeat;
  }

  .principles,
  .program-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  nav {
    gap: 10px;
    font-size: 13px;
  }

  .principles,
  .program-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    max-width: 420px;
  }
}