:root {
  --navy: #07152f;
  --navy-2: #0b2450;
  --blue: #1677ff;
  --blue-dark: #0d5bd3;
  --lime: #b7ff3c;
  --white: #ffffff;
  --off-white: #f7f9fc;
  --light-blue: #edf5ff;
  --gray: #667085;
  --dark-gray: #344054;
  --border: #e4e9f0;
  --success: #19a463;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  color: var(--navy);
  background: var(--white);
  line-height: 1.6;
}

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

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* ================================
   NAV
================================ */

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 21, 47, 0.97);
  backdrop-filter: blur(12px);
  color: white;
}

.nav-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 25px;
  font-weight: 900;
  letter-spacing: -1.2px;
}

.logo span {
  color: var(--lime);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 700;
}

.nav-links a:hover {
  color: var(--lime);
}

.nav-cta {
  background: var(--lime);
  color: var(--navy);
  padding: 10px 17px;
  border-radius: 999px;
  font-weight: 900;
}

/* ================================
   BUTTONS
================================ */

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-block;
  padding: 14px 23px;
  border-radius: 999px;
  font-weight: 850;
  transition: 0.2s ease;
  cursor: pointer;
}

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

.button-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(183, 255, 60, 0.25);
}

.button-outline {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: white;
}

.button-outline:hover {
  background: rgba(255, 255, 255, 0.1);
}

.button-blue {
  background: var(--blue);
  color: white;
}

.button-blue:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
}

/* ================================
   EYEBROW
================================ */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--lime);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1.7px;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 3px;
  background: currentColor;
  border-radius: 10px;
}

.eyebrow-blue {
  color: var(--blue);
}

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

.hero {
  background:
    radial-gradient(
      circle at 82% 18%,
      rgba(22, 119, 255, 0.38),
      transparent 33%
    ),
    linear-gradient(
      135deg,
      var(--navy) 0%,
      var(--navy-2) 100%
    );
  color: white;
  padding: 96px 0 88px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 65px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(54px, 7vw, 88px);
  line-height: 0.92;
  letter-spacing: -4px;
  margin-bottom: 28px;
}

.hero h1 span {
  color: var(--lime);
}

.hero h2 {
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.1;
  margin-bottom: 18px;
  letter-spacing: -1px;
}

.hero-copy {
  max-width: 670px;
  color: #dce8ff;
  font-size: 19px;
  margin-bottom: 30px;
}

.audience-line {
  margin-top: 22px;
  color: #aebfdc;
  font-size: 14px;
  font-weight: 650;
}

.audience-line strong {
  color: white;
}

/* ================================
   CHALLENGE CARD
================================ */

.challenge-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 28px;
  padding: 30px;
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.22);
}

.challenge-label {
  color: var(--lime);
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 900;
  letter-spacing: 1.4px;
}

.challenge-card h3 {
  font-size: 28px;
  line-height: 1.15;
  margin: 9px 0 22px;
}

.challenge-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.challenge-stat {
  background: rgba(255, 255, 255, 0.07);
  border-radius: 15px;
  padding: 15px 10px;
  text-align: center;
}

.challenge-stat strong {
  display: block;
  font-size: 23px;
  color: white;
}

.challenge-stat span {
  display: block;
  color: #b9c8df;
  font-size: 11px;
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 0.6px;
}

.progress {
  height: 15px;
  background: rgba(255, 255, 255, 0.13);
  border-radius: 20px;
  overflow: hidden;
  margin: 12px 0 8px;
}

.progress-bar {
  width: 72%;
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--lime),
    #7eff00
  );
  border-radius: 20px;
}

.progress-numbers {
  display: flex;
  justify-content: space-between;
  color: #c9d7ef;
  font-size: 13px;
  font-weight: 700;
}

.challenge-message {
  margin-top: 22px;
  padding: 17px;
  border-radius: 16px;
  background: rgba(183, 255, 60, 0.1);
  color: white;
}

.challenge-message strong {
  color: var(--lime);
}

/* ================================
   GENERAL SECTIONS
================================ */

section {
  padding: 90px 0;
}

.section-light {
  background: var(--off-white);
}

.section-header {
  max-width: 740px;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.02;
  letter-spacing: -2.5px;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--gray);
  font-size: 18px;
}

/* ================================
   PHILOSOPHY
================================ */

.philosophy {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 65px;
  align-items: center;
}

.philosophy-statement {
  font-size: clamp(31px, 4vw, 49px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -2px;
}

.philosophy-statement span {
  color: var(--blue);
}

.philosophy-copy p {
  color: var(--gray);
  font-size: 18px;
  margin-bottom: 18px;
}

.principle-box {
  margin-top: 25px;
  padding: 22px;
  background: var(--light-blue);
  border-left: 4px solid var(--blue);
  border-radius: 0 15px 15px 0;
}

.principle-box strong {
  display: block;
  margin-bottom: 4px;
  color: var(--navy);
}

.principle-box span {
  color: var(--gray);
}

/* ================================
   AGE POSITIONING
================================ */

.age-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.age-card {
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 30px;
  background: white;
}

.age-card.highlight {
  background: var(--navy);
  color: white;
  border-color: var(--navy);
}

.age-card .age-label {
  color: var(--blue);
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 900;
  letter-spacing: 1.2px;
}

.age-card.highlight .age-label {
  color: var(--lime);
}

.age-card h3 {
  font-size: 27px;
  margin: 8px 0 12px;
}

.age-card p {
  color: var(--gray);
}

.age-card.highlight p {
  color: #c7d5eb;
}

/* ================================
   HOW IT WORKS
================================ */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.step {
  background: white;
  border: 1px solid var(--border);
  padding: 25px;
  border-radius: 21px;
}

.step-number {
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1px;
}

.step h3 {
  font-size: 21px;
  margin: 7px 0;
}

.step p {
  color: var(--gray);
  font-size: 14px;
}

/* ================================
   MVP / DARK SECTIONS
================================ */

.mvp {
  background:
    radial-gradient(
      circle at 15% 20%,
      rgba(22, 119, 255, 0.22),
      transparent 30%
    ),
    var(--navy);
  color: white;
}

.mvp-grid {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: 65px;
  align-items: center;
}

.mvp h2 {
  font-size: clamp(39px, 5vw, 60px);
  line-height: 0.98;
  letter-spacing: -2.5px;
  margin-bottom: 20px;
}

.mvp-copy {
  color: #c9d7ef;
  font-size: 18px;
  margin-bottom: 25px;
}

.mvp-equation {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 15px 0 25px;
  font-weight: 900;
}

.equation-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 13px;
  padding: 11px 14px;
}

.equation-item strong {
  color: var(--lime);
}

.equation-symbol {
  color: #7890b5;
}

.mvp-card {
  background: white;
  color: var(--navy);
  border-radius: 26px;
  padding: 30px;
}

.mvp-card-label {
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-size: 12px;
  font-weight: 900;
}

.mvp-card h3 {
  font-size: 28px;
  margin: 7px 0 20px;
}

.mvp-list {
  list-style: none;
}

.mvp-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}

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

.check {
  color: var(--success);
  font-weight: 900;
  margin-right: 6px;
}

/* ================================
   SPORTS
================================ */

.sports {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.sport {
  border: 1px solid var(--border);
  background: white;
  border-radius: 18px;
  padding: 21px;
  font-weight: 850;
  text-align: center;
}

.sport small {
  display: block;
  margin-top: 3px;
  color: var(--gray);
  font-size: 11px;
  font-weight: 650;
}

/* ================================
   AUDIENCES
================================ */

.audiences {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 17px;
}

.audience {
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 27px;
  background: white;
}

.audience-icon {
  font-size: 27px;
  margin-bottom: 13px;
}

.audience h3 {
  font-size: 21px;
  margin-bottom: 8px;
}

.audience p {
  color: var(--gray);
  font-size: 15px;
}

/* ================================
   SPONSORS
================================ */

.sponsor {
  text-align: center;
}

.sponsor .section-header {
  margin-left: auto;
  margin-right: auto;
}

.sponsor-box {
  max-width: 850px;
  margin: 0 auto;
  padding: 45px;
  border-radius: 28px;
  background:
    linear-gradient(
      135deg,
      #edf5ff,
      #f5ffe6
    );
  border: 1px solid var(--border);
}

.sponsor-box h3 {
  font-size: 31px;
  margin-bottom: 12px;
}

.sponsor-box p {
  max-width: 650px;
  margin: 0 auto 25px;
  color: var(--gray);
  font-size: 17px;
}

.sponsor-points {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 9px;
  margin-bottom: 25px;
}

.sponsor-point {
  padding: 8px 13px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--dark-gray);
  font-size: 13px;
  font-weight: 750;
}

/* ================================
   CHALLENGE PAGE
================================ */

.challenge-hero {
  background:
    radial-gradient(
      circle at 85% 15%,
      rgba(22, 119, 255, 0.35),
      transparent 35%
    ),
    linear-gradient(
      135deg,
      var(--navy),
      var(--navy-2)
    );
  color: white;
  padding: 72px 0 70px;
}

.challenge-hero h1 {
  max-width: 800px;
  font-size: clamp(43px, 7vw, 78px);
  line-height: 0.96;
  letter-spacing: -3px;
  margin-bottom: 20px;
}

.challenge-hero h1 span {
  color: var(--lime);
}

.challenge-hero-copy {
  max-width: 690px;
  color: #c9d7ef;
  font-size: 19px;
}

.challenge-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 25px;
}

.meta-pill {
  padding: 9px 14px;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.07);
  border-radius: 999px;
  color: white;
  font-size: 13px;
  font-weight: 800;
}

.day-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.day-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 23px;
  padding: 25px;
  transition: 0.2s ease;
}

.day-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(7, 21, 47, 0.08);
}

.day-number {
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

.day-card h3 {
  font-size: 23px;
  margin: 6px 0 17px;
}

.question {
  padding: 12px 0;
  border-top: 1px solid var(--border);
  color: var(--dark-gray);
  font-size: 14px;
}

.question strong {
  color: var(--navy);
}

.watch-button {
  display: inline-block;
  margin-top: 15px;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--light-blue);
  color: var(--blue-dark);
  font-size: 13px;
  font-weight: 900;
}

.watch-button:hover {
  background: #dcecff;
}

.challenge-rules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 17px;
}

.rule {
  padding: 25px;
  border-radius: 21px;
  background: var(--off-white);
  border: 1px solid var(--border);
}

.rule-number {
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.rule h3 {
  margin: 6px 0;
  font-size: 20px;
}

.rule p {
  color: var(--gray);
  font-size: 14px;
}

.challenge-cta {
  text-align: center;
  background: var(--navy);
  color: white;
}

.challenge-cta h2 {
  font-size: clamp(38px, 6vw, 62px);
  line-height: 0.98;
  letter-spacing: -2.5px;
  margin-bottom: 18px;
}

.challenge-cta p {
  max-width: 620px;
  margin: 0 auto 28px;
  color: #c9d7ef;
  font-size: 18px;
}

/* ================================
   FINAL CTA
================================ */

.final-cta {
  text-align: center;
  background: var(--off-white);
}

.final-cta h2 {
  font-size: clamp(43px, 6vw, 72px);
  line-height: 0.94;
  letter-spacing: -3px;
  margin-bottom: 20px;
}

.final-cta h2 span {
  color: var(--blue);
}

.final-cta p {
  max-width: 620px;
  margin: 0 auto 28px;
  color: var(--gray);
  font-size: 18px;
}

/* ================================
   FOOTER
================================ */

footer {
  background: #040d20;
  color: white;
  padding: 45px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

footer p {
  color: #91a1bd;
  font-size: 13px;
}

/* ================================
   MOBILE
================================ */

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .hero-grid,
  .philosophy,
  .mvp-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 75px 0;
  }

  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .sports {
    grid-template-columns: 1fr 1fr;
  }

  .audiences {
    grid-template-columns: 1fr 1fr;
  }

  .challenge-card {
    margin-top: 10px;
  }

  .challenge-rules {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  section {
    padding: 65px 0;
  }

  .hero h1,
  .challenge-hero h1 {
    letter-spacing: -3px;
  }

  .steps,
  .age-grid,
  .audiences,
  .sports,
  .day-grid,
  .challenge-rules {
    grid-template-columns: 1fr;
  }

  .challenge-stats {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .sponsor-box {
    padding: 29px 22px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .button {
    width: 100%;
    text-align: center;
  }

  .buttons {
    width: 100%;
  }

  .mvp-equation {
    align-items: stretch;
    flex-direction: column;
  }

  .equation-symbol {
    text-align: center;
  }
}