/* ==========================================================================
   Layout Styles - Micro Learning English (Brand v3 – Stitch)
   ========================================================================== */

/* Header: nền trắng mờ, viền dưới mảnh (giống giao diện mới) */
.site-header {
  background-color: rgba(255, 255, 255, 0.95);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-16);
  height: 80px;
}

.brand-logo {
  font-size: 20px;
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.01em;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  white-space: nowrap;
}

.brand-logo:hover {
  text-decoration: none;
  color: var(--color-primary-strong);
  opacity: 1;
}

.brand-logo-img {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  object-fit: cover;
  background: var(--color-bg-subtle);
}

@media (max-width: 480px) {
  .brand-logo { font-size: 17px; gap: 6px; }
  .brand-logo-img { width: 36px; height: 36px; }
}

@media (max-width: 360px) {
  .brand-logo { font-size: 15px; gap: 5px; }
  .brand-logo-img { width: 32px; height: 32px; }
}

.brand-logo .logo-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background-color: var(--color-primary-strong);
  border-radius: var(--radius-full);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

/* Nav Menu Desktop */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
  padding: 8px 4px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  text-decoration: none;
  opacity: 1;
}

.nav-link.active {
  font-weight: var(--font-weight-bold);
  border-bottom: 2px solid var(--color-primary);
}

.nav-link,
.header-cta .btn {
  white-space: nowrap;
}

/* Nút trên header: "Nhận tư vấn" tím đặc, "Kiểm tra trình độ" viền tím */
.header-cta .btn {
  background-color: var(--color-cta);
  color: var(--color-cta-text);
  border-color: var(--color-cta);
  font-weight: var(--font-weight-semibold);
}

.header-cta .btn:hover {
  background-color: var(--color-cta-hover);
  color: var(--color-cta-text);
  border-color: var(--color-cta-hover);
}

.header-cta-outline .btn {
  background-color: var(--color-white);
  color: var(--color-primary-strong);
  border-color: var(--color-primary-strong);
}

.header-cta-outline .btn:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: var(--color-primary-strong);
}

/* Màn hình ≥1280px: menu đầy đủ trên một dòng */
@media (min-width: 1280px) {
  .site-header .header-inner {
    max-width: 1280px;
    padding-left: var(--spacing-32);
    padding-right: var(--spacing-32);
  }

  .nav-menu { gap: 12px; }

  .nav-link {
    font-size: 15px;
    padding: 8px 4px;
  }

  .header-cta .btn {
    padding: 8px 12px !important;
  }
}

/* Nút mở menu trên Mobile (Hamburger) */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 18px;
  cursor: pointer;
  color: var(--color-text);
}

/* Footer: nền kem nhạt, viền trên mảnh */
.site-footer {
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-48);
  padding-bottom: 96px; /* Để chừa khoảng trống cho mobile bottom bar */
  margin-top: var(--spacing-48);
  font-size: 14px;
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .site-footer {
    padding-bottom: var(--spacing-48);
  }
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-32);
  margin-bottom: var(--spacing-32);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-col h4,
.footer-heading,
.footer-brand {
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-16);
  color: var(--color-primary);
}

.footer-col ul,
.footer-links,
.footer-contact {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li,
.footer-links li,
.footer-contact li {
  margin-bottom: var(--spacing-8);
}

.footer-col a,
.footer-links a,
.footer-contact a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
}

.footer-col a:hover,
.footer-links a:hover,
.footer-contact a:hover {
  color: var(--color-primary);
  text-decoration: none;
  opacity: 1;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-24);
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* Nút Zalo cố định ở góc */
.floating-zalo-btn {
  position: fixed;
  bottom: 84px; /* Trên mobile để tránh thanh bottom bar */
  right: 16px;
  z-index: 99;
  width: 52px;
  height: 52px;
  background-color: var(--color-primary-strong);
  color: var(--color-white) !important;
  border: 3px solid var(--color-primary-soft);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  text-decoration: none !important;
  font-weight: var(--font-weight-extrabold);
  font-size: 14px;
  letter-spacing: 0.5px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.floating-zalo-btn:hover {
  transform: translateY(-2px) scale(1.05);
  background-color: var(--color-primary);
  opacity: 1;
}

@media (min-width: 768px) {
  .floating-zalo-btn {
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    font-size: 15px;
  }
}

/* Thanh cố định dưới cùng trên Mobile (Mobile Bottom Bar) */
.mobile-bottom-bar {
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 98;
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 10px 16px;
  gap: var(--spacing-16);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
  .mobile-bottom-bar {
    display: none;
  }
}

.mobile-bottom-bar .btn {
  flex: 1;
  padding: 10px 16px;
  font-size: 15px;
}

/* Responsive Menu cho Mobile */
@media (max-width: 1279px) {
  .mobile-nav-toggle {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--spacing-16);
    gap: var(--spacing-8);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--color-text);
  }

  .nav-link:hover {
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
  }

  .nav-menu .header-cta {
    width: 100%;
    margin-top: var(--spacing-8);
  }

  .nav-menu .header-cta .btn {
    width: 100%;
  }
}