/* Math with Nester — refined academic tutoring landing */

:root {
  --ink: #0c1a2b;
  --ink-soft: #3a4a5c;
  --ink-muted: #5c6b7a;
  --cream: #f6f1e8;
  --cream-deep: #ebe4d6;
  --paper: #fbf8f2;
  --teal: #1f8a7c;
  --teal-deep: #176b60;
  --teal-soft: rgba(31, 138, 124, 0.12);
  --line: rgba(12, 26, 43, 0.1);
  --line-strong: rgba(12, 26, 43, 0.18);
  --focus: #1f8a7c;
  --radius: 3px;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Source Sans 3", system-ui, -apple-system, sans-serif;
  --max: 68rem;
  --gut: clamp(1.25rem, 4vw, 2.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Soft paper wash + faint math grid */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 70% 45% at 50% -8%, rgba(31, 138, 124, 0.09), transparent 55%),
    radial-gradient(ellipse 50% 40% at 100% 30%, rgba(12, 26, 43, 0.04), transparent 50%),
    radial-gradient(ellipse 45% 35% at 0% 85%, rgba(31, 138, 124, 0.05), transparent 45%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, black, transparent 75%);
}

.skip-link {
  position: absolute;
  left: var(--gut);
  top: -100px;
  z-index: 100;
  padding: 0.65rem 1rem;
  background: var(--ink);
  color: var(--cream);
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 0.75rem;
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.top-mark,
main,
.site-footer {
  position: relative;
  z-index: 2;
}

.top-mark {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem var(--gut) 0;
}

.mark-logo {
  display: block;
  flex: 0 0 2.5rem;
  width: 2.5rem;
  height: 2.5rem;
}

.mark-text {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3.5rem, 10vw, 6.5rem) var(--gut) clamp(3rem, 8vw, 5rem);
  text-align: center;
}

.eyebrow {
  margin: 0 0 1.25rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
}

.wordmark {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-size: clamp(3.25rem, 9vw, 5.75rem);
  font-weight: 600;
  font-optical-sizing: auto;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.wordmark em {
  font-style: italic;
  font-weight: 400;
  color: var(--teal-deep);
}

.one-liner {
  max-width: 32rem;
  margin: 0 auto 2.25rem;
  font-size: clamp(1.125rem, 2.2vw, 1.3125rem);
  font-weight: 300;
  line-height: 1.55;
  color: var(--ink-soft);
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.cta-primary {
  background: var(--ink);
  color: var(--cream);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08) inset;
}

.cta-primary:hover {
  background: var(--teal-deep);
  transform: translateY(-1px);
}

.cta-primary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.cta-primary:active {
  transform: translateY(0);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  justify-content: center;
  align-items: center;
}

.cta-secondary {
  background: transparent;
  color: var(--teal-deep);
  border: 1px solid rgba(31, 138, 124, 0.45);
}

.cta-secondary:hover {
  background: var(--teal-soft);
  border-color: var(--teal);
  transform: translateY(-1px);
}

.cta-secondary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.cta-secondary:active {
  transform: translateY(0);
}

/* Offer / rate card */
.offer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gut) clamp(3.5rem, 8vw, 5.5rem);
}

.offer-card {
  max-width: 28rem;
  margin: 0 auto;
  padding: clamp(2rem, 4vw, 2.75rem) clamp(1.75rem, 4vw, 2.5rem);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.7) inset,
    0 18px 40px -24px rgba(12, 26, 43, 0.28);
  text-align: center;
}

.offer-label {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.price {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 4.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.currency {
  font-size: 0.45em;
  font-weight: 600;
  vertical-align: super;
  margin-right: 0.05em;
  color: var(--ink-soft);
}

.unit {
  font-size: 0.35em;
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0;
  color: var(--ink-muted);
  margin-left: 0.1em;
}

.price-note {
  margin: 0.75rem 0 0;
  font-size: 1rem;
  font-weight: 400;
  color: var(--ink-soft);
}

.divider {
  height: 1px;
  margin: 1.75rem 0;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.includes {
  margin: 0;
  padding: 0;
  list-style: none;
  text-align: left;
}

.includes li {
  position: relative;
  padding: 0.55rem 0 0.55rem 1.5rem;
  font-size: 0.975rem;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

.includes li:last-child {
  border-bottom: none;
}

.includes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.1rem;
  width: 0.5rem;
  height: 0.5rem;
  border: 1.5px solid var(--teal);
  border-radius: 50%;
}

/* Credentials */
.credentials {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 4.5rem) var(--gut);
  background: var(--ink);
  color: var(--cream);
  /* full-bleed breakout */
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  position: relative;
}

.credentials::before {
  content: "f(x)";
  position: absolute;
  right: clamp(1rem, 8vw, 6rem);
  top: 1.5rem;
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 8rem);
  font-style: italic;
  font-weight: 400;
  color: rgba(246, 241, 232, 0.04);
  pointer-events: none;
  letter-spacing: -0.04em;
}

.section-title {
  position: relative;
  max-width: 40rem;
  margin: 0 auto 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-align: center;
  color: var(--cream);
}

.creds-lede {
  position: relative;
  max-width: 32rem;
  margin: 0 auto 2.75rem;
  font-size: 1.0625rem;
  font-weight: 300;
  line-height: 1.6;
  text-align: center;
  color: rgba(246, 241, 232, 0.72);
}

.cred-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  max-width: 56rem;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  background: rgba(246, 241, 232, 0.08);
  border: 1px solid rgba(246, 241, 232, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.cred {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 1.75rem 0.85rem;
  background: rgba(12, 26, 43, 0.65);
  text-align: center;
}

.cred-num {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--teal);
}

.cred-label {
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.4;
  color: rgba(246, 241, 232, 0.78);
  max-width: 10rem;
}

/* Final CTA */
.final-cta {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 6rem) var(--gut);
  text-align: center;
}

.final-cta h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.final-copy {
  max-width: 28rem;
  margin: 0 auto 2rem;
  font-size: 1.0625rem;
  font-weight: 300;
  color: var(--ink-soft);
}

.final-copy strong {
  font-weight: 600;
  color: var(--ink);
}

/* Footer */
.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem var(--gut) 2.75rem;
  border-top: 1px solid var(--line-strong);
  text-align: center;
}

.footer-brand {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ink);
}

.footer-meta {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.footer-meta a {
  color: var(--teal-deep);
  text-decoration: none;
  font-weight: 500;
}

.footer-meta a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-meta a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

.footer-email {
  margin: 0;
  padding: 0;
  font: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  border-bottom: 1px solid transparent;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-email:hover {
  color: var(--teal-deep, #0f6b4c);
  border-bottom-color: currentColor;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-email:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

.email-toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  z-index: 50;
  max-width: min(22rem, calc(100vw - 2rem));
  padding: 0.85rem 1.15rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--cream, #f7f3ea);
  text-align: center;
  background: var(--ink);
  border-radius: 4px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  transform: translate(-50%, 0.75rem);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.email-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.sep {
  margin: 0 0.5rem;
  opacity: 0.5;
}

@media (max-width: 900px) {
  .cred-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 720px) {
  .cred-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 420px) {
  .cred-grid {
    grid-template-columns: 1fr;
  }

  .cta-primary {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .cta-primary {
    transition: none;
  }

  .cta-primary:hover {
    transform: none;
  }
}