/* ========== Header ========== */
.c-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px;
  background: transparent;
  transition: all .25s ease;
}
.c-header.is-scrolled {
  background: rgba(241, 248, 250, 0.85);
  backdrop-filter: blur(10px);
}
.c-header__inner {
  max-width: 1472px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  background: #fff;
  backdrop-filter: blur(10px);
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(28, 70, 96, 0.06);
  min-height: 76px;
}
.c-header__logo { flex-shrink: 0; }
.c-header__logo img { height: 40px; width: auto; display: block; }

.c-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  height: 100%;
}
.c-nav__list { display: flex; height: 100%; }
.c-nav__item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.c-nav__item a {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 16px;
  font-weight: 500;
  color: var(--c-navy);
  letter-spacing: 0.1em;
  line-height: 1.76;
  transition: color .2s;
  white-space: nowrap;
}
.c-nav__item--active {
  border-bottom: 4px solid var(--c-teal);
}
.c-nav__item a:hover { color: var(--c-teal); }

.c-hamburger {
  display: none;
  width: 32px; height: 32px;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}
.c-hamburger span {
  display: block;
  height: 2px;
  background: var(--c-navy);
  border-radius: 2px;
}

@media (max-width: 1024px) {
  .c-header__inner { padding: 12px 20px; }
  .c-nav { display: none; }
  .c-hamburger { display: flex; margin-left: auto; }
  .c-header__logo img { height: 32px; }
}

/* ========== Buttons ========== */
.c-btn-primary, .c-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 28px;
  height: 48px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  transition: all .25s ease;
  white-space: nowrap;
}
.c-btn-primary {
  background: var(--c-teal);
  color: #fff;
}
.c-btn-primary:hover { background: var(--c-teal-dark); }
.c-btn-secondary {
  background: var(--c-navy);
  color: #fff;
}
.c-btn-secondary:hover { background: #2a5a77; }

/* Outline button: 「ラベル | →」3要素構成 */
.c-btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 26px;
  padding: 20px 30px;
  background: transparent;
  border: 1px solid #1C4660;
  border-radius: 10px;
  color: #1C4660;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 1.6px;
  line-height: 1;
  text-decoration: none;
  transition: .25s;
}
.c-btn-outline .label { order: 1; }
.c-btn-outline::before {
  content: "";
  display: block;
  width: 0;
  height: 30px;
  border-left: 1px solid #1C4660;
  order: 2;
}
.c-btn-outline::after {
  content: "→";
  display: block;
  font-size: 16px;
  line-height: 1;
  order: 3;
  transition: transform .25s;
}
.c-btn-outline:hover {
  background: #1C4660;
  color: #fff;
}
.c-btn-outline:hover::before { border-left-color: #fff; }
.c-btn-outline:hover::after { transform: translateX(4px); }

/* ========== Section Heading (deco text) ========== */
.c-section-heading {
  position: relative;
  text-align: center;
  padding: 140px 0 80px;
  isolation: isolate;
  z-index: 1;
}
.c-section-heading__en {
  position: absolute;
  left: 50%;
  top: 30px;
  font-family: 'Oooh Baby', var(--f-deco);
  font-size: 130px;
  line-height: 1;
  color: #D9EE52;
  z-index: 0;
  pointer-events: none;
  white-space: nowrap;
  font-weight: 400;
  margin: 0;
}
.c-section-heading__jp {
  position: relative;
  z-index: 2;
  font-size: 22px;
  font-weight: 700;
  color: var(--c-navy);
  letter-spacing: 0.14em;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 70px;
}
.c-section-heading__jp::before,
.c-section-heading__jp::after {
  content: "";
  width: 14px; height: 14px;
  background: url('/assets/images/common/section-circle-1.svg') center/contain no-repeat;
  display: inline-block;
}
.c-section-heading--feature  .c-section-heading__en { transform: translate(-50%, 0) rotate(-9.26deg); }
.c-section-heading--lesson   .c-section-heading__en { transform: translate(-50%, 0) rotate(-10.31deg); }
.c-section-heading--teachers .c-section-heading__en { transform: translate(-50%, 0) rotate(-8.55deg); }
.c-section-heading--voice    .c-section-heading__en { transform: translate(-50%, 0) rotate(-10deg); }
.c-section-heading--news     .c-section-heading__en { transform: translate(-50%, 0) rotate(-6deg); }

/* ========== Footer ========== */
.c-footer {
  background: var(--c-navy);
  color: #fff;
  padding: 80px 24px 32px;
  margin-top: 120px;
  position: relative;
  overflow: hidden;
}
.c-footer__inner {
  max-width: var(--w-content);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
}
.c-footer__brand img {
  filter: brightness(0) invert(1);
  height: 48px;
  margin-bottom: 20px;
}
.c-footer__brand p { font-size: 13px; opacity: .85; line-height: 1.9; }
.c-footer__nav { display: flex; flex-direction: column; gap: 12px; }
.c-footer__nav a {
  font-size: 14px;
  opacity: .85;
  transition: opacity .2s;
}
.c-footer__nav a:hover { opacity: 1; color: var(--c-teal); }
.c-footer__bottom {
  max-width: var(--w-content);
  margin: 56px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.12);
  text-align: center;
  font-size: 12px;
  opacity: .6;
  letter-spacing: 0.08em;
}
@media (max-width: 1024px) {
  .c-footer__inner { grid-template-columns: 1fr; gap: 32px; }
}