/* =============================================================
   MS-PRO NEXT GENERATION — LAYOUT
   Container, grid system, spacing utilities
   ============================================================= */

/* ── Site Wrapper ── */
#page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
#content { flex: 1 0 auto; }

/* ── Containers ── */
.mspng-container,
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.container-sm  { max-width: var(--container-sm); }
.container-md  { max-width: var(--container-md); }
.container-lg  { max-width: var(--container-lg); }
.container-xl  { max-width: var(--container-xl); }
.container-2xl { max-width: var(--container-2xl); }
.container-full { max-width: 100%; }

/* ── Grid System ── */
.mspng-grid {
  display: grid;
  gap: var(--space-6);
}

/* Post grid layouts */
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto-sm { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-auto-md { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
.grid-auto-lg { grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); }

/* Content + Sidebar layouts */
.layout-with-sidebar {
  display: grid;
  gap: var(--sidebar-gap);
  align-items: start;
}

.layout-sidebar-right { grid-template-columns: 1fr var(--sidebar-width); }
.layout-sidebar-left  { grid-template-columns: var(--sidebar-width) 1fr; }
.layout-no-sidebar    { grid-template-columns: 1fr; }

.main-content-area { min-width: 0; }
.sidebar-area { min-width: 0; }

/* ── Section Spacing ── */
.section-pad {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}
.section-pad-sm {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}
.section-pad-lg {
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
}

/* ── Divider ── */
.section-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

/* ── Section Header (title + link) ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-border);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--fw-extrabold);
  color: var(--color-heading);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  position: relative;
}

.section-header__title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.section-header__link {
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-primary);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  transition: color var(--transition-fast);
}
.section-header__link:hover { color: var(--color-primary-hover); }
.section-header__link::after { content: '→'; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .layout-sidebar-right,
  .layout-sidebar-left {
    grid-template-columns: 1fr;
  }
  .sidebar-area {
    order: 1;
  }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section-pad { padding-top: var(--space-8); padding-bottom: var(--space-8); }
  .section-pad-lg { padding-top: var(--space-12); padding-bottom: var(--space-12); }
}

@media (max-width: 640px) {
  :root { --container-pad: var(--space-4); }
}

/* ══════════════════════════════════════
   LAYOUT MODES (set by CSS Bridge via body class)
   ══════════════════════════════════════ */

/* Full Width */
body.layout-full .mspng-container,
body.layout-full .container {
  max-width: 100%;
  padding-left: clamp(var(--space-4), 3vw, var(--space-10));
  padding-right: clamp(var(--space-4), 3vw, var(--space-10));
}

/* Narrow */
body.layout-narrow .mspng-container,
body.layout-narrow .container {
  max-width: var(--container-narrow, 860px);
}

/* Wide */
body.layout-wide .mspng-container,
body.layout-wide .container {
  max-width: var(--container-max, 1440px);
}

/* Boxed (default — container-max already set by Bridge) */
body.layout-boxed .mspng-container,
body.layout-boxed .container {
  max-width: var(--container-max, 1280px);
}

/* ══════════════════════════════════════
   READING PROGRESS BAR
   ══════════════════════════════════════ */
#mspng-reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--progress-color, var(--color-primary));
  z-index: var(--z-toast);
  transition: width 100ms linear;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

/* ══════════════════════════════════════
   MOBILE SIDEBAR ACCORDION
   ══════════════════════════════════════ */
@media (max-width: 1024px) {
  .sidebar-accordion {
    border: 1px solid var(--color-border);
    border-radius: var(--card-radius);
    overflow: hidden;
    margin-top: var(--space-6);
  }
  .sidebar-accordion__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    font-weight: var(--fw-semibold);
    cursor: pointer;
    border: none;
    width: 100%;
    text-align: left;
    font-size: var(--text-base);
    color: var(--color-heading);
    border-bottom: 1px solid var(--color-border);
  }
  .sidebar-accordion__content {
    display: none;
    padding: var(--space-5);
    background: var(--color-surface);
  }
  .sidebar-accordion.is-open .sidebar-accordion__content { display: block; }
  .sidebar-accordion__toggle .arrow { transition: transform var(--transition-base); }
  .sidebar-accordion.is-open .sidebar-accordion__toggle .arrow { transform: rotate(180deg); }
}