:root {
  --precision-bg: #0a0a0a;
  --precision-panel: #151515;
  --precision-panel-soft: #1b1b1b;
  --precision-border: rgba(212, 175, 55, 0.22);
  --precision-border-strong: rgba(212, 175, 55, 0.46);
  --precision-gold: #d4af37;
  --precision-text: #f7f5ef;
  --precision-muted: rgba(255, 255, 255, 0.76);
  --precision-subtle: rgba(255, 255, 255, 0.58);
  --precision-error: #ffb4a8;
  --precision-radius: 8px;
  --precision-shadow: 0 20px 55px rgba(0, 0, 0, 0.32);
  --precision-gutter: clamp(1rem, 4vw, 4rem);
  --precision-content-max: 1180px;
}

body {
  background: var(--precision-bg);
  color: var(--precision-text);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.precision-page {
  min-height: 100vh;
  overflow: clip;
  background: var(--precision-bg);
}

.precision-container {
  width: min(
    calc(100% - (var(--precision-gutter) * 2)),
    var(--precision-content-max)
  );
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  white-space: nowrap;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
}

/* ===============================
   HERO
================================= */

.precision-hero {
  position: relative;
  min-height: min(720px, 82vh);
  display: flex;
  align-items: center;
  padding: clamp(7rem, 12vw, 10rem) 0 clamp(4rem, 7vw, 6rem);
  border-bottom: 1px solid rgba(212, 175, 55, 0.14);
  background:
    linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.94) 0%,
      rgba(0, 0, 0, 0.82) 56%,
      rgba(0, 0, 0, 0.68) 100%
    ),
    url("https://cdn.affluentfit.com/personal-training-in-luxury-gym.webp")
      center 38% / cover no-repeat;
}

.precision-hero .precision-container {
  position: relative;
  z-index: 1;
}

.precision-eyebrow,
.section-kicker {
  margin: 0 0 0.85rem;
  color: var(--precision-gold);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.precision-hero h1 {
  max-width: 850px;
  margin: 0;
  color: var(--precision-text);
  font-size: clamp(2.5rem, 6vw, 5.2rem);
  line-height: 1;
  letter-spacing: 0;
  text-wrap: balance;
}

.precision-lede {
  max-width: 720px;
  margin: 1.4rem 0 0;
  color: var(--precision-muted);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.75;
}

.precision-notice {
  max-width: 880px;
  margin-top: 2rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--precision-border);
  border-left: 3px solid var(--precision-gold);
  border-radius: var(--precision-radius);
  background: rgba(10, 10, 10, 0.82);
  color: var(--precision-muted);
  line-height: 1.65;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.precision-notice strong {
  color: var(--precision-text);
}

/* ===============================
   CALCULATOR
================================= */

.precision-tool-section {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
  background: #0d0d0d;
}

.precision-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.78fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: start;
}

.precision-card {
  min-width: 0;
  border: 1px solid var(--precision-border);
  border-radius: var(--precision-radius);
  background: var(--precision-panel);
  box-shadow: var(--precision-shadow);
}

.precision-form,
.precision-results {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.precision-results {
  position: sticky;
  top: 110px;
}

.card-heading {
  margin-bottom: 1.75rem;
}

.card-heading h2 {
  margin: 0;
  color: var(--precision-text);
  font-size: clamp(1.35rem, 2vw, 1.8rem);
  line-height: 1.2;
  letter-spacing: 0;
}

.field-group {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 1.25rem;
}

.field-group label {
  color: var(--precision-text);
  font-size: 0.9rem;
  font-weight: 700;
}

.input-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  min-height: 58px;
  overflow: hidden;
  border: 1px solid rgba(212, 175, 55, 0.28);
  border-radius: var(--precision-radius);
  background: #0c0c0c;
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.input-shell:focus-within {
  border-color: var(--precision-border-strong);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.input-shell:has(input[aria-invalid="true"]) {
  border-color: var(--precision-error);
  box-shadow: 0 0 0 3px rgba(255, 180, 168, 0.08);
}

.input-shell input {
  width: 100%;
  min-width: 0;
  padding: 1rem;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--precision-text);
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
}

.input-shell input::placeholder {
  color: rgba(255, 255, 255, 0.3);
}

.input-shell input::-webkit-inner-spin-button,
.input-shell input::-webkit-outer-spin-button {
  margin: 0;
}

.input-shell span {
  padding: 0 1rem;
  color: var(--precision-gold);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.field-note {
  margin: 0;
  color: var(--precision-subtle);
  font-size: 0.84rem;
  line-height: 1.55;
}

.toggle-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin: 1.5rem 0;
  padding: 1rem;
  border: 1px solid rgba(212, 175, 55, 0.16);
  border-radius: var(--precision-radius);
  background: var(--precision-panel-soft);
}

.toggle-row strong,
.toggle-row > div > span {
  display: block;
}

.toggle-row strong {
  color: var(--precision-text);
  font-size: 0.92rem;
}

.toggle-row > div > span {
  margin-top: 0.3rem;
  color: var(--precision-subtle);
  font-size: 0.8rem;
  line-height: 1.45;
}

.switch {
  position: relative;
  flex: 0 0 auto;
  width: 52px;
  height: 30px;
}

.switch input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.switch > span:last-child {
  position: absolute;
  inset: 0;
  pointer-events: none;
  border: 1px solid var(--precision-border);
  border-radius: 999px;
  background: #0d0d0d;
  transition:
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.switch > span:last-child::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 5px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--precision-subtle);
  transition:
    transform 180ms ease,
    background 180ms ease;
}

.switch input:checked + span {
  border-color: var(--precision-border-strong);
  background: rgba(212, 175, 55, 0.08);
}

.switch input:checked + span::before {
  transform: translateX(21px);
  background: var(--precision-gold);
}

.switch input:focus-visible + span {
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.16);
}

.form-error {
  min-height: 1.35rem;
  margin: 0 0 1rem;
  color: var(--precision-error);
  font-size: 0.88rem;
  line-height: 1.5;
}

.precision-reset {
  width: 100%;
  min-height: 52px;
  padding: 0.8rem 1rem;
  border: 1px solid var(--precision-border);
  border-radius: var(--precision-radius);
  background: transparent;
  color: var(--precision-gold);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.precision-reset:hover,
.precision-reset:focus-visible {
  border-color: var(--precision-gold);
  background: var(--precision-gold);
  color: #111111;
}

.precision-reset:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 3px;
}

/* ===============================
   RESULTS
================================= */

.result-stack {
  display: grid;
  gap: 0.85rem;
}

.result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.45rem;
  min-height: 128px;
  padding: 1.15rem;
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: var(--precision-radius);
  background: #0c0c0c;
}

.result-row > span {
  color: var(--precision-subtle);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-row strong {
  max-width: 100%;
  overflow-wrap: anywhere;
  color: var(--precision-text);
  font-size: clamp(1.65rem, 4vw, 2.35rem);
  line-height: 1;
  letter-spacing: 0;
}

.result-row small {
  color: var(--precision-gold);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.result-emphasis {
  border-color: var(--precision-border-strong);
  background: #19170f;
}

.formula-panel {
  margin-top: 1.25rem;
  padding: 1rem;
  overflow: hidden;
  border-left: 2px solid var(--precision-gold);
  border-radius: var(--precision-radius);
  background: rgba(255, 255, 255, 0.035);
}

.formula-panel p {
  margin: 0 0 0.45rem;
  color: var(--precision-subtle);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.formula-panel code {
  display: block;
  max-width: 100%;
  overflow-wrap: anywhere;
  color: var(--precision-text);
  font-family: "Inter", system-ui, sans-serif;
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ===============================
   RESOURCE LINKS
================================= */

.precision-links {
  padding: 0 0 clamp(3.5rem, 7vw, 6rem);
  background: #0d0d0d;
}

.precision-links-card {
  padding: clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--precision-border);
  border-bottom: 1px solid var(--precision-border);
}

.precision-links-card h2 {
  max-width: 760px;
  margin: 0 0 1rem;
  color: var(--precision-text);
  font-size: clamp(1.45rem, 2.5vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: 0;
  text-wrap: balance;
}

.precision-links-card p {
  max-width: 850px;
  margin: 0;
  color: var(--precision-muted);
  line-height: 1.75;
}

.precision-links-card p a {
  color: var(--precision-gold);
  text-decoration: underline;
  text-decoration-color: rgba(212, 175, 55, 0.45);
  text-underline-offset: 0.2em;
}

.precision-links-card p a:hover,
.precision-links-card p a:focus-visible {
  color: #ffffff;
  text-decoration-color: var(--precision-gold);
}

.precision-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.precision-link-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.7rem 1rem;
  border: 1px solid var(--precision-border);
  border-radius: var(--precision-radius);
  color: var(--precision-gold);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    background 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.precision-link-row a:hover,
.precision-link-row a:focus-visible {
  border-color: var(--precision-gold);
  background: var(--precision-gold);
  color: #111111;
}

.precision-link-row a:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 3px;
}

/* ===============================
   EDUCATION
================================= */

.precision-education {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
  border-top: 1px solid rgba(212, 175, 55, 0.12);
  background: #111111;
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
}

.education-grid article {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--precision-border);
}

.education-grid h2,
.clinical-disclaimer h2 {
  margin: 0 0 1rem;
  color: var(--precision-text);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.2;
  letter-spacing: 0;
}

.education-grid p,
.clinical-disclaimer p,
.education-grid li {
  color: var(--precision-muted);
  line-height: 1.75;
}

.education-grid p,
.clinical-disclaimer p {
  margin: 0 0 1rem;
}

.education-grid p:last-child,
.clinical-disclaimer p:last-child {
  margin-bottom: 0;
}

.education-grid ul {
  margin: 0;
  padding-left: 1.2rem;
}

.education-grid li + li {
  margin-top: 0.65rem;
}

.education-grid li::marker {
  color: var(--precision-gold);
}

.clinical-disclaimer {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--precision-border);
  border-left: 3px solid var(--precision-gold);
  border-radius: var(--precision-radius);
  background: var(--precision-panel);
}

/* ===============================
   RESPONSIVE
================================= */

@media (max-width: 900px) {
  .precision-grid,
  .education-grid {
    grid-template-columns: 1fr;
  }

  .precision-results {
    position: static;
  }

  .precision-hero {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .precision-hero {
    padding: 7rem 0 3.75rem;
    background:
      linear-gradient(
        180deg,
        rgba(0, 0, 0, 0.78) 0%,
        rgba(0, 0, 0, 0.94) 100%
      ),
      url("https://cdn.affluentfit.com/personal-training-in-luxury-gym.webp")
        58% center / cover no-repeat;
  }

  .precision-hero h1 {
    font-size: clamp(2.35rem, 12vw, 3.4rem);
    line-height: 1.02;
  }

  .precision-notice {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .precision-form,
  .precision-results,
  .clinical-disclaimer {
    padding: 1.1rem;
  }

  .toggle-row {
    align-items: flex-start;
  }

  .result-row {
    min-height: 116px;
  }

  .result-row strong {
    font-size: 1.8rem;
  }

  .precision-link-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .precision-link-row a {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .input-shell,
  .switch > span:last-child,
  .switch > span:last-child::before,
  .precision-reset,
  .precision-link-row a {
    transition: none;
  }
}