/* ================================================================
   LXMUN · components.css
   Reusable UI components shared across all pages.
   Requires: global.css (for design tokens)
   
   Contents:
     1. Layout Helpers  — .container, .section
     2. Reveal Animation — .reveal
     3. Buttons          — .btn, .btn--primary, .btn--outline
     4. Navbar
     5. Section Header
     6. Footer
     7. Responsive Breakpoints (navbar & footer only)
   ================================================================ */


/* ── 1. Layout Helpers ── */

/* Centered content wrapper */
.container {
  width: min(var(--container-max), 100%);
  padding-inline: var(--container-pad);
  margin-inline: auto;
}

/* Section top/bottom padding */
.section {
  padding-block: var(--space-2xl);
}


/* ── 2. Reveal Animation ── */

/* Scroll-reveal: elements start hidden, JS adds .is-visible */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Stagger children inside a reveal parent */
.reveal:nth-child(1) { transition-delay: 0.05s; }
.reveal:nth-child(2) { transition-delay: 0.12s; }
.reveal:nth-child(3) { transition-delay: 0.19s; }
.reveal:nth-child(4) { transition-delay: 0.26s; }
.reveal:nth-child(5) { transition-delay: 0.33s; }
.reveal:nth-child(6) { transition-delay: 0.40s; }


/* ── 3. Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 12px 28px;
  font-family: var(--font-chinese);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-base),
              color var(--transition-base),
              border-color var(--transition-base);
}

.btn--primary {
  background-color: var(--color-accent);
  color: #fff;
}
.btn--primary:hover {
  background-color: var(--color-accent-hover);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--outline:hover {
  background-color: var(--color-primary);
  color: #fff;
}

.btn__arrow {
  font-size: 1.1em;
  transition: transform var(--transition-base);
}
.btn:hover .btn__arrow {
  transform: translateX(4px);
}


/* ── 4. Navbar ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--navbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: var(--container-pad);
  background: var(--color-bg);
  border-bottom: 1px solid #e6e6e6;
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-card);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--color-text-muted);
  text-decoration: none;
  flex-shrink: 0;
}
.navbar__logo img {
  height: 36px;
  width: auto;
}

.navbar__links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}
.navbar__links a {
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition-base);
}
.navbar__links a:hover {
  color: var(--color-link);
  text-decoration: underline;
}

/* Hamburger (hidden on desktop) */
.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.navbar__toggle span {
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.navbar__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__toggle.is-open span:nth-child(2) { opacity: 0; }
.navbar__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }


/* ── 5. Section Header ── */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.section-header__title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--color-accent-light);
  letter-spacing: 0.4em;
}

.section-header__link {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--color-accent-light);
  transition: color var(--transition-base);
}
.section-header__link:hover {
  color: var(--color-link);
  text-decoration: underline;
}

.section-header__line {
  height: 4px;
  background: linear-gradient(to right, transparent, var(--color-divider), transparent);
  margin-bottom: var(--space-xl);
  border-radius: 2px;
}


/* ── 6. Footer ── */
.footer {
  background: var(--color-bg);
}

.footer__subscribe {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-xl) var(--container-pad);
  background: var(--color-bg);
  border-top: 1px solid #e6e6e6;
  max-width: var(--container-max);
  margin-inline: auto;
}

.footer__subscribe-title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.2em;
}
.footer__subscribe-desc {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
  letter-spacing: 0.1em;
}

.footer__qr-group {
  display: flex;
  gap: var(--space-md);
  flex-shrink: 0;
}
.footer__qr {
  width: 100px;
  height: 100px;
  background-size: cover;
  background-position: center;
  border-radius: var(--radius-sm);
}
.footer__qr--1 { background-image: url('../../media/qr1.jpg'); }
.footer__qr--2 { background-image: url('../../media/qr2.jpg'); }

.footer__bottom {
  background: var(--color-primary-dark);
  padding: var(--space-lg) var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: #fff;
  font-size: var(--fs-md);
  font-weight: 700;
  text-decoration: none;
}
.footer__logo img {
  height: 40px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
}
.footer__nav a {
  color: rgba(255,255,255,0.75);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-base);
}
.footer__nav a:hover {
  color: #fff;
  text-decoration: underline;
}


/* ── 7. Responsive Breakpoints (components only) ── */

/* ─── Mobile (≤768px) ─── */
@media (max-width: 768px) {

  /* Navbar */
  .navbar__toggle {
    display: flex;
  }
  .navbar__nav {
    display: none;
    position: absolute;
    top: var(--navbar-h);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid #e6e6e6;
    padding: var(--space-sm) var(--container-pad);
    box-shadow: var(--shadow-card);
  }
  .navbar__nav.is-open {
    display: block;
  }
  .navbar__links {
    flex-direction: column;
    gap: var(--space-sm);
    padding-block: var(--space-xs);
  }

  /* Footer subscribe: stack */
  .footer__subscribe {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer__qr {
    width: 80px;
    height: 80px;
  }

  /* Footer bottom: stack */
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
  .footer__nav {
    gap: var(--space-sm);
  }
}

/* ─── Small mobile (≤480px) ─── */
@media (max-width: 480px) {
  .section-header__title {
    font-size: var(--fs-xl);
  }
}