@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700;800&family=Lato:wght@300;400;700&display=swap');

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

:root {
  --ocean-dark: #0b2545;
  --ocean-mid: #134074;
  --ocean-light: #8da9c4;
  --seafoam: #13a89e;
  --white: #ffffff;
  --sand-white: #f7f9fc;
  --text-main: #1b3a5c;
  --text-sub: #6b8299;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Lato', sans-serif;
  background: var(--sand-white);
  color: var(--text-main);
  line-height: 1.75;
}

.site-header {
  background: linear-gradient(90deg, var(--ocean-dark), var(--ocean-mid));
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-family: 'Poppins', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--white);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo svg { width: 32px; height: 32px; }

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ocean-light);
  text-decoration: none;
  transition: color 0.3s;
}

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

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  background: none;
  border: none;
}

.hamburger span { width: 26px; height: 3px; background: var(--white); border-radius: 2px; }

main { min-height: 80vh; }

.hero {
  background: linear-gradient(170deg, var(--ocean-dark) 0%, var(--ocean-mid) 50%, var(--seafoam) 100%);
  padding: 6rem 2rem 4rem;
  text-align: center;
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 80px;
  background: var(--sand-white);
  clip-path: ellipse(55% 100% at 50% 100%);
}

.hero h1 {
  font-family: 'Poppins', sans-serif;
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 1.2rem;
  position: relative;
  z-index: 1;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.85;
  max-width: 650px;
  margin: 0 auto 2rem;
  position: relative;
  z-index: 1;
}

.hero-btn {
  display: inline-block;
  background: var(--white);
  color: var(--ocean-dark);
  padding: 14px 40px;
  border-radius: 50px;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  text-decoration: none;
  position: relative;
  z-index: 1;
  transition: transform 0.3s, box-shadow 0.3s;
}

.hero-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.wave-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 4rem 2rem 3rem;
  max-width: 1100px;
  margin: 0 auto;
}

.wave-card {
  background: var(--white);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 4px 15px rgba(11,37,69,0.08);
  border-bottom: 4px solid var(--seafoam);
}

.wave-card .wc-icon { font-size: 2.2rem; margin-bottom: 0.8rem; }

.wave-card h3 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-dark);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.wave-card p { color: var(--text-sub); font-size: 0.88rem; }

.game-section {
  padding: 3rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.game-section h2 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-dark);
  text-align: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.game-box {
  background: var(--ocean-dark);
  border-radius: 16px;
  overflow: hidden;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: 0 8px 30px rgba(11,37,69,0.15);
}

.game-box iframe { width: 100%; height: 600px; border: none; display: block; }

.ocean-about {
  background: linear-gradient(180deg, var(--sand-white), #e8f0f8);
  padding: 4rem 2rem;
}

.ocean-about-inner {
  max-width: 900px;
  margin: 0 auto;
}

.ocean-about h2 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-dark);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
}

.ocean-about p { color: var(--text-sub); margin-bottom: 1rem; }

.tide-features {
  padding: 3rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.tide-features h2 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-dark);
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 2rem;
}

.tide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.tide-item {
  background: var(--white);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: start;
  gap: 1rem;
  box-shadow: 0 2px 10px rgba(11,37,69,0.06);
}

.tide-item .ti-icon { font-size: 1.6rem; flex-shrink: 0; }

.tide-item h3 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-mid);
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

.tide-item p { color: var(--text-sub); font-size: 0.85rem; }

.content-page {
  padding: 4rem 2rem;
  max-width: 850px;
  margin: 2rem auto;
  background: var(--white);
  border-radius: 16px;
  box-shadow: 0 4px 15px rgba(11,37,69,0.06);
}

.content-page h1 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-dark);
  font-size: 2.2rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--seafoam);
}

.content-page h2 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-mid);
  font-size: 1.2rem;
  margin: 2rem 0 0.8rem;
}

.content-page p, .content-page li {
  color: var(--text-sub);
  margin-bottom: 0.8rem;
  font-size: 0.93rem;
}

.content-page ul { padding-left: 1.5rem; margin-bottom: 1.5rem; }

.play-top {
  background: linear-gradient(170deg, var(--ocean-dark), var(--ocean-mid));
  padding: 4rem 2rem 2rem;
  text-align: center;
  color: var(--white);
}

.play-top h1 {
  font-family: 'Poppins', sans-serif;
  font-size: 2.4rem;
  margin-bottom: 0.8rem;
}

.play-top p { opacity: 0.8; max-width: 550px; margin: 0 auto; }

.play-wrap { padding: 2rem; max-width: 1000px; margin: 0 auto; }

.play-note {
  background: var(--white);
  border-radius: 10px;
  padding: 1rem 1.5rem;
  margin-top: 1.5rem;
  text-align: center;
  color: var(--text-sub);
  font-size: 0.86rem;
  box-shadow: 0 2px 8px rgba(11,37,69,0.06);
}

.site-footer {
  background: var(--ocean-dark);
  padding: 2.5rem 2rem;
  text-align: center;
  color: var(--ocean-light);
}

.ft-links { margin-bottom: 1rem; }

.ft-links h4 {
  font-family: 'Poppins', sans-serif;
  color: var(--white);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.ft-links a {
  color: var(--ocean-light);
  text-decoration: none;
  margin: 0 0.7rem;
  font-size: 0.82rem;
}

.ft-links a:hover { color: var(--seafoam); }

.ft-copy { font-size: 0.75rem; opacity: 0.6; }

.age-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11,37,69,0.92);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.age-card {
  background: var(--white);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  max-width: 420px;
  width: 90%;
}

.age-card h2 {
  font-family: 'Poppins', sans-serif;
  color: var(--ocean-dark);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.age-card p { color: var(--text-sub); margin-bottom: 1.5rem; }

.age-btns { display: flex; gap: 1rem; justify-content: center; }

.age-btns button {
  padding: 11px 32px;
  border-radius: 50px;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: 0.3s;
}

.age-yes { background: var(--seafoam); color: var(--white); }
.age-yes:hover { background: #0f8c84; }
.age-no { background: #e8f0f8; color: var(--ocean-dark); }
.age-no:hover { background: #d0e2f0; }

.age-err {
  color: #e74c3c;
  font-weight: 600;
  margin-top: 1rem;
  display: none;
}

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--ocean-dark);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1rem;
    transform: translateY(-120%);
    transition: transform 0.3s;
  }
  .nav-links.open { transform: translateY(0); }
  .hero h1 { font-size: 1.8rem; }
  .wave-cards { grid-template-columns: 1fr; }
  .tide-grid { grid-template-columns: 1fr; }
  .game-box iframe { height: 380px; }
}