/* ============================================================
   Learnova website — navy theme
   ============================================================ */
:root {
  --navy-50: #eef2fb;
  --navy-100: #d7e0f6;
  --navy-200: #aebfec;
  --navy-300: #8099de;
  --navy-400: #4f6fc6;
  --navy-500: #2f4fae; /* primary */
  --navy-600: #243f8c;
  --navy-700: #1b2f6b;
  --navy-800: #142250;
  --navy-900: #0c1838;

  --ink: #0c1838;
  --body: #2b3a55;
  --muted: #5a6a86;
  --surface: #ffffff;
  --line: #d7e0f6;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 14px 40px rgba(27, 47, 107, 0.16);
  --shadow-sm: 0 6px 18px rgba(27, 47, 107, 0.12);

  --display: "Fredoka", system-ui, sans-serif;
  --text: "Nunito", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--text);
  color: var(--body);
  background: var(--navy-50);
  line-height: 1.65;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 48px);
  background: linear-gradient(135deg, var(--navy-500), var(--navy-700));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--navy-800);
  box-shadow: var(--shadow-sm);
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: #ffffff;
}
.brand-mark { font-size: 26px; }
.brand-name {
  font-family: var(--display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.3px;
}
.header-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}
.nav-link {
  font-family: var(--text);
  font-weight: 700;
  font-size: 15px;
  color: #eaf1ff;
  background: none;
  border: none;
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.nav-link:hover { background: rgba(255, 255, 255, 0.16); color: #ffffff; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--display);
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  border: none;
  border-radius: 999px;
  padding: 12px 22px;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.15s, background 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--navy-400), var(--navy-700));
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { box-shadow: var(--shadow); }
.btn-ghost {
  background: transparent;
  color: var(--navy-800);
  border: 2px solid var(--navy-300);
}
.btn-ghost:hover { background: var(--navy-100); }
.btn-app {
  margin-left: 0;
  background: #ffffff;
  color: var(--navy-700);
  padding: 9px 16px;
  font-size: 15px;
  box-shadow: var(--shadow-sm);
}
.btn-app:hover { background: var(--navy-100); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(56px, 9vw, 110px) clamp(16px, 4vw, 48px);
  background:
    radial-gradient(1100px 500px at 15% -10%, var(--navy-200), transparent 60%),
    radial-gradient(900px 500px at 95% 10%, var(--navy-100), transparent 55%),
    linear-gradient(160deg, var(--navy-700), var(--navy-900));
  color: #eaf1ff;
  overflow: hidden;
}
.hero-inner { max-width: 920px; margin: 0 auto; text-align: center; }
.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 2.5px;
  font-weight: 700;
  font-size: 13px;
  color: var(--navy-200);
  margin: 0 0 14px;
}
.hero-title {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.08;
  margin: 0 0 18px;
  color: #ffffff;
}
.hero-title span { color: var(--navy-300); }
.hero-sub {
  font-size: clamp(16px, 2.2vw, 20px);
  color: #d6e3fb;
  max-width: 700px;
  margin: 0 auto 28px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.hero .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.5); }
.hero .btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }
.hero-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  padding: 0;
  margin: 0;
}
.hero-pills li {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 8px 15px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  color: #eaf1ff;
}

/* ---------- Content + tabs ---------- */
.content {
  max-width: 880px;
  margin: 0 auto;
  padding: clamp(28px, 5vw, 56px) clamp(16px, 4vw, 32px) 64px;
}
.tabbar {
  position: sticky;
  top: 64px;
  z-index: 10;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px;
  margin-bottom: 24px;
  background: rgba(238, 242, 251, 0.92);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 999px;
  scrollbar-width: none;
}
.tabbar::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto;
  font-family: var(--text);
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
  color: var(--navy-800);
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 999px;
  padding: 9px 16px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.tab:hover { border-color: var(--navy-300); }
.tab.is-active {
  background: var(--navy-500);
  border-color: var(--navy-500);
  color: #fff;
}

/* ---------- Panels / cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: clamp(22px, 4vw, 40px);
}
.panel { animation: fade 0.25s ease; }
.panel[hidden] { display: none; }
@keyframes fade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 34px);
  color: var(--ink);
  margin: 0 0 18px;
}
.panel h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 23px);
  color: var(--navy-800);
  margin: 28px 0 10px;
  padding-top: 6px;
  border-top: 2px solid var(--navy-100);
}
.panel p { margin: 0 0 14px; font-size: 16.5px; }
.panel ul {
  margin: 0 0 18px;
  padding-left: 0;
  list-style: none;
}
.panel li {
  position: relative;
  padding: 4px 0 4px 26px;
  font-size: 16.5px;
}
.panel li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 13px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--navy-400);
}
.panel blockquote {
  margin: 22px 0;
  padding: 18px 22px;
  background: var(--navy-50);
  border-left: 5px solid var(--navy-400);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 18px;
  color: var(--navy-900);
  text-align: center;
}
.panel blockquote.quote-strong { font-weight: 700; font-size: 19px; }
.panel .center { text-align: center; }
.panel .muted { color: var(--muted); font-size: 14px; }
.link {
  color: var(--navy-600);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--navy-200);
}
.link:hover { color: var(--navy-800); border-color: var(--navy-400); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy-900);
  color: #cdd9f0;
  padding: 40px clamp(16px, 4vw, 48px) 26px;
}
.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand .brand-mark { font-size: 24px; }
.footer-brand .brand-name {
  color: #fff;
  font-family: var(--display);
  font-size: 20px;
  margin-left: 6px;
}
.footer-brand p { margin: 8px 0 0; color: #9fb3d8; font-size: 14px; }
.footer-links { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.footer-link {
  background: none;
  border: none;
  color: #cdd9f0;
  font-family: var(--text);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  padding: 2px 0;
}
.footer-link:hover { color: #fff; text-decoration: underline; }
.footer-copy {
  max-width: 980px;
  margin: 26px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
  color: #8a9fc8;
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .header-nav { display: none; }
  .btn-app { margin-left: auto; }
  .tabbar { top: 60px; }
}