/**
 * layout.css
 * Wise-adapted page layouts: sticky white headers, deep ink-black footers,
 * and 48px section padding increments.
 */

/* 1. Base Container */
.container {
  inline-size: 100%;
  max-inline-size: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--spacing-xl);
}

/* 2. Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  block-size: var(--header-height);
  background-color: var(--surface-opaque);
  border-block-end: 1px solid var(--border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  block-size: 100%;
}

/* 3. Branding/Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.logo img,
.logo svg {
  inline-size: 32px;
  block-size: 32px;
}

/* 4. Navigation Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: 14px; /* body-sm */
  font-weight: 600; /* body-sm-strong */
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding-block: var(--spacing-xs);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2.5px;
  background-color: var(--text-primary); /* Use Ink for active indicator bar */
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* 5. Theme Toggle Button */
.theme-toggle {
  position: relative;
  inline-size: 40px;
  block-size: 40px;
  border-radius: var(--rounded-full);
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  display: grid;
  place-items: center;
  overflow: hidden;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--border);
}

.theme-toggle svg {
  grid-area: 1 / 1;
  inline-size: 18px;
  block-size: 18px;
  fill: var(--text-primary);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Theme Icon Rotations */
:root[data-theme="light"] .sun-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
}
:root[data-theme="light"] .moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0);
}
:root[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0);
}
:root[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .sun-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
  }
  :root:not([data-theme]) .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0);
  }
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
  }
  :root:not([data-theme]) .moon-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
  }
}

/* 6. Mobile Nav menu tray */
.mobile-toggle {
  display: none;
  inline-size: 40px;
  block-size: 40px;
  border-radius: var(--rounded-md);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  z-index: 1010;
}

.mobile-toggle span {
  display: block;
  inline-size: 22px;
  block-size: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-toggle.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.mobile-toggle.open span:nth-child(2) {
  opacity: 0;
}
.mobile-toggle.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    inset-block-start: var(--header-height);
    inset-inline-end: 0;
    inline-size: 100vw;
    block-size: calc(100vh - var(--header-height));
    background-color: var(--surface-opaque);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-3xl) var(--spacing-xl);
    gap: var(--spacing-xl);
    border-block-start: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 1000;
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-link {
    font-size: 1.25rem;
    inline-size: 100%;
  }

  .nav-link::after {
    display: none;
  }
}

/* 7. Section Padding (48px - spacing-3xl) */
section {
  padding-block: var(--spacing-3xl);
}

.section-header {
  margin-block-end: var(--spacing-2xl);
  max-inline-size: 650px;
}

.section-title {
  font-size: 32px; /* display-sm */
  font-weight: 600; /* Inter-rendered section heading */
  letter-spacing: -0.96px;
  margin-block-end: var(--spacing-sm);
  color: var(--text-primary);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 16px; /* body-md */
}

/* 8. Global Ink-Black Footer */
.site-footer {
  background-color: #0e0f0c; /* Deep Ink always */
  color: #e8ebe6;             /* Sage Canvas soft always */
  padding-block: var(--spacing-3xl) var(--spacing-xl);
  margin-block-start: var(--spacing-3xl);
}

/* Ensure branding text in footer respects dark canvas soft tone */
.site-footer .logo {
  color: #e8ebe6 !important;
}

.site-footer .logo img,
.site-footer .logo svg {
  filter: brightness(0) invert(1) sepia(20%) saturate(200%) hue-rotate(50deg);
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-block-end: var(--spacing-2xl);
}

@media (max-width: 768px) {
  .footer-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
}

.footer-brand p {
  color: #a2a5a1;
  font-size: 14px; /* body-sm */
  margin-block-start: var(--spacing-md);
  max-inline-size: 350px;
  line-height: 1.5;
}

.footer-links-group h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-block-end: var(--spacing-md);
  color: #ffffff;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  color: #a2a5a1;
  font-size: 14px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #9fe870; /* Hover highlights in Wise Green */
}

.footer-bottom {
  border-block-start: 1px solid #1c1d19;
  padding-block-start: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-bottom p {
  color: #7b7e7a;
  font-size: 12px; /* caption */
}

.social-links {
  display: flex;
  gap: var(--spacing-lg);
}

.social-link {
  color: #a2a5a1;
  transition: color var(--transition-fast);
}

.social-link:hover {
  color: #9fe870;
}

.social-link svg {
  inline-size: 20px;
  block-size: 20px;
  fill: currentColor;
}