/* Layout Styles - Page Structure, Sections, and Grid Systems */

/* ===== PAGE STRUCTURE ===== */

html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
}

/* ===== HEADER ===== */

header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: saturate(120%) blur(6px);
  background: color-mix(in srgb, #000 60%, transparent);
  border-bottom: 1px solid var(--color-border);
  margin: 0;
  padding: 0;
}

/* ===== NAVIGATION ===== */

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0.75rem var(--space-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: var(--font-weight-bold);
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.brand span {
  font-family: var(--font-display);
  letter-spacing: var(--letter-spacing-wide);
  font-size: var(--font-size-2xl);
  color: var(--color-accent);
  line-height: 1;
  display: none;
}

@media (min-width: 640px) {
  .brand span {
    display: inline;
  }
}

.brand:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

/* ===== MAIN CONTENT ===== */

main {
  margin: clamp(2rem, 4vw, 4rem) auto;
  max-width: var(--container-max);
  padding: 0 var(--space-md);
  width: 100%;
}

/* ===== SECTIONS ===== */

section {
  margin: 2.5rem auto 0;
  text-align: left;
}

section.hero {
  display: grid;
  place-items: center;
  gap: var(--space-lg);
  margin: 2rem 0 2.5rem;
  text-align: center;
}

section.hero img {
  width: min(560px, 90vw);
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

section.intro {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
  margin: 2.5rem 0;
}

@media (min-width: 800px) {
  section.intro {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
}

/* ===== ARTICLES & CARDS ===== */

article {
  margin-bottom: var(--space-xl);
}

.card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.5vw, 1.5rem);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.card--featured {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-bg-secondary) 95%, var(--color-accent) 5%);
}

.card--compact {
  padding: var(--space-md);
}

/* ===== FOOTER ===== */

footer {
  margin-top: 3rem;
  margin-bottom: 0;
  padding: 3rem var(--space-md);
  background: color-mix(in srgb, #000 40%, transparent);
  border-top: 1px solid var(--color-border);
  text-align: left;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
}

footer .container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
}

footer h4 {
  margin: 1.25rem 0 0.25rem;
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-fg-secondary);
}

footer h4:first-child {
  margin-top: 0;
}

footer p {
  margin-bottom: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

footer a {
  color: var(--color-accent);
}

/* ===== TWO-COLUMN LAYOUT ===== */

.grid {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 800px) {
  .grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .grid--3col {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }
}

@media (max-width: 799px) {
  .grid--3col {
    grid-template-columns: 1fr;
  }
}

/* ===== SIDEBAR LAYOUT ===== */

.sidebar-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (min-width: 1024px) {
  .sidebar-layout {
    grid-template-columns: 1fr 300px;
  }
}

.sidebar {
  position: sticky;
  top: 100px;
}

/* ===== HEADER STYLES ===== */

.page-header {
  margin-bottom: var(--space-2xl);
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-lg);
}

/* ===== BREADCRUMBS ===== */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-md);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  margin: 0;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin: 0 var(--space-sm);
  color: var(--color-muted);
}

.breadcrumbs a {
  color: var(--color-accent);
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

/* ===== HERO SECTION ===== */

.hero {
  text-align: center;
  padding: 2rem 0;
  margin-bottom: var(--space-2xl);
}

.hero-image {
  width: min(560px, 90vw);
  height: auto;
  max-height: 500px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-lg);
}

.hero h1 {
  margin-top: 0.5rem;
  margin-bottom: var(--space-md);
}

.hero .tag {
  color: var(--color-muted);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  margin-top: 0.25rem;
}

/* ===== BUTTONS ===== */

.btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  background: linear-gradient(180deg, var(--color-brand-light), var(--color-brand));
  color: #fff;
  font-weight: var(--font-weight-bold);
  padding: 0.9rem 1.1rem;
  border-radius: 10px;
  text-decoration: none;
  display: inline-block;
  transition: all var(--transition-base);
  font-family: inherit;
  font-size: var(--font-size-base);
}

.btn:hover {
  filter: brightness(1.07);
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.btn--secondary {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-brand);
  color: #fff;
  border-color: var(--color-brand);
}

/* ===== CTA SECTION ===== */

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-md);
}

.cta-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ===== CONTENT WRAPPER ===== */

.content {
  max-width: 60rem;
}

.content > * + * {
  margin-top: var(--space-md);
}

.content section + section {
  margin-top: 2rem;
}

/* ===== RESPONSIVE PADDING ===== */

@media (max-width: 640px) {
  main {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-xl);
  }

  section {
    margin-top: var(--space-xl);
  }

  .card {
    padding: var(--space-md);
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  main {
    margin-top: 2rem;
    margin-bottom: 2rem;
  }
}

/* ===== ACCESSIBILITY ===== */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== FOCUS VISIBLE STYLES ===== */

:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

a:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

button:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}