/* ============================================================
   Calculation Hub — Global Layout Engine (HUB CORE)
   Governance v5 — Layout Authority Only (Institutional Grade)
   ------------------------------------------------------------
   Owns:
   - Page grid + column placement
   - Container widths
   - Sticky header + sidebar placement (POSITION ONLY)
   - Responsive stacking (main + sidebar)
   - Page authority spacing (H1 + description)
   - Breadcrumb placement
   - Anchor offset stabilization
   - Mobile drawer placement (structure + containment)

   Does NOT own:
   - Panel shell visuals (border/radius/surface/padding/stacking) → pp-panels.css
   - Tool internals                                              → tool-shell.css
   - Shared component styling                                    → pp-components.css
   ============================================================ */


/* ============================================================
   GLOBAL DOCUMENT NORMALIZATION (Embed-safe)
   ============================================================ */
html,
body {
  margin: 0;
  padding: 0;
}


/* ============================================================
   LAYOUT TOKENS (STRUCTURAL ONLY)
   ============================================================ */
:root {
  --pp-max-width: 1200px;

  /* Header height is structural; used for sticky offsets */
  --pp-header-h: 72px;

  /* Page paddings (layout-owned structure) */
  --pp-page-pad-x: 16px;
  --pp-page-pad-top: 24px;
  --pp-page-pad-bot: 40px;

  /* Grid geometry */
  --pp-shell-gap: 24px;
  --pp-sidebar-w: 280px;

  /* Sticky offset spacing */
  --pp-sticky-gap: 16px;
}

@media (max-width: 768px) {
  :root {
    --pp-header-h: 64px;
    --pp-page-pad-top: 20px;
    --pp-page-pad-bot: 32px;
  }
}


/* ============================================================
   GLOBAL HEADER (Structure Only)
   ============================================================ */
.pp-header {
  position: sticky;
  top: 0;
  height: var(--pp-header-h);
  background: var(--pp-surface-base);
  border-bottom: 1px solid var(--pp-border-structural);
  z-index: 1000;
  box-sizing: border-box;
}

/* Header alignment container */
.pp-header .pp-page {
  max-width: var(--pp-max-width);
  margin-inline: auto;
  padding-inline: var(--pp-page-pad-x);
  box-sizing: border-box;
}

.pp-header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 40px;
  box-sizing: border-box;
}

.pp-global-nav {
  margin-left: auto;
}

.pp-footer {
  border-top: 1px solid var(--pp-border-structural);
  background: var(--pp-surface-base);
}

.pp-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-top: 24px;
  padding-bottom: 24px;
  color: var(--pp-text-muted);
  font-size: 0.9rem;
}

.pp-footer-brand {
  display: grid;
  gap: 8px;
}

.pp-footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  width: fit-content;
  color: var(--pp-brand-900);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
}

.pp-footer-brand-link img {
  display: block;
}

.pp-footer-brand small {
  color: var(--pp-text-600);
  font-size: 0.82rem;
}

.pp-footer nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 12px 22px;
}

.pp-footer nav a {
  color: var(--pp-text-700);
  text-decoration: none;
}

.pp-footer nav a:hover {
  color: var(--pp-brand-900);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.pp-footer nav a:focus-visible {
  outline: 2px solid var(--pp-brand-700);
  outline-offset: 4px;
  border-radius: 2px;
}

@media (max-width: 768px) {
  .pp-footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 20px;
  }

  .pp-footer nav {
    justify-content: flex-start;
  }
}


/* ============================================================
   PAGE WRAPPER
   ============================================================ */
.pp-page {
  max-width: var(--pp-max-width);
  margin-inline: auto;
  padding: var(--pp-page-pad-top) var(--pp-page-pad-x) var(--pp-page-pad-bot);
  box-sizing: border-box;
}


/* ============================================================
   TOOL PAGE GRID (ToolPageShell)
   Layout only: grid placement + responsive behavior
   ============================================================ */
.pp-shell {
  display: block;
}

.pp-main {
  display: block;
  min-width: 0; /* Prevents overflow in grid context */
}



/* ============================================================
   TOOL FRAME (Structural Wrapper Only — Not a Panel)
   ------------------------------------------------------------
   No borders, no background, no padding ownership.
   Multi-island surface must be implemented as a pp-panel variant
   inside the tool markup (or future pp-panel--frame-multi).
   ============================================================ */
.pp-frame {
  width: 100%;
  background: transparent;
  border: 0;
  padding: 0;
  border-radius: 0;
  box-sizing: border-box;
}


/* ============================================================
   TOOL PAGE SHELL VARIANTS
   ============================================================ */

@media (min-width: 1024px) {
  .pp-shell {
    display: block;
  }

  .pp-shell--with-sidebar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) var(--pp-sidebar-w);
    gap: var(--pp-shell-gap);
    align-items: start;
  }

  /* Sidebar is a pp-panel variant.
     Layout owns ONLY positioning. */
  .pp-shell--with-sidebar > .pp-sidebar {
    position: sticky;
    top: calc(var(--pp-header-h) + var(--pp-sticky-gap));
    align-self: start;
  }
}

@media (max-width: 1023px) {
  .pp-shell--with-sidebar > .pp-sidebar {
    display: none;
  }
}

/* ============================================================
   WIDE TOOL SHELL VARIANT
   ------------------------------------------------------------
   PURPOSE
   - Widen the global page wrapper only when the current page
     contains a shell that explicitly opts into wide mode

   OWNERSHIP
   - Layout/container geometry only
   - Opt-in shell variant only

   NOTE
   - `.pp-page` is the actual outer width constraint in the
     current layout system
   - Therefore wide mode must widen `.pp-page`, not only inner
     shell children
   - This keeps default/compact tools unchanged
   ============================================================ */

.pp-page:has(.pp-shell--wide) {
  max-width: 1360px;
}

.pp-shell--wide {
  width: 100%;
}

.pp-shell--wide .pp-main {
  width: 100%;
  max-width: none;
  min-width: 0;
}

.pp-shell--wide .pp-frame {
  width: 100%;
  max-width: none;
}

/* ============================================================
   BREADCRUMB — PLACEMENT (Layout Only)
   ============================================================ */
nav.pp-breadcrumb {
  margin-bottom: 14px;
  font-size: var(--pp-small-size);
}

nav.pp-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav.pp-breadcrumb li {
  display: inline-flex;
  align-items: center;
  color: var(--pp-text-600);
}

nav.pp-breadcrumb li + li::before {
  content: "/";
  margin: 0 6px;
  color: var(--pp-text-500);
}

nav.pp-breadcrumb a {
  color: var(--pp-text-700);
  text-decoration: none;
}

nav.pp-breadcrumb a:hover {
  text-decoration: underline;
}


/* ============================================================
   ANCHOR OFFSET STABILIZATION
   ============================================================ */
[id^="tool--"],
[id^="island--"],
[id^="t-"] {
  scroll-margin-top: calc(var(--pp-header-h) + var(--pp-sticky-gap));
}


/* ============================================================
   MOBILE DRAWER (Layout Placement + Containment)
   NOTE: Drawer is a layout overlay module (not a pp-panel).
   ============================================================ */
.pp-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
}

body.pp-drawer-open {
  overflow: hidden;
}

@media (max-width: 768px) {
  .page-title,
  .pp-page-title,
  h1.page-title {
    font-size: 24px;
    line-height: 1.18;
  }

  .pp-menu-toggle {
    display: block;
    margin-left: auto;
  }

  .pp-global-nav {
    display: none;
  }

  .pp-mobile-drawer {
    position: fixed;
    inset: 0;
    z-index: 1500;
    background: color-mix(in srgb, var(--pp-text-900) 22%, transparent);
    backdrop-filter: blur(4px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 260ms ease;
  }

  .pp-mobile-drawer:not([hidden]) {
    opacity: 1;
    pointer-events: auto;
  }

  .pp-mobile-drawer-inner {
    position: relative;
    width: 88%;
    max-width: 360px;
    margin: 90px auto;
    background: var(--pp-surface-base);
    border: 1px solid var(--pp-border-structural);
    border-radius: var(--pp-radius-lg);
    padding: 26px 20px 20px;
    transform: translateY(14px) scale(0.98);
    transition: transform 280ms cubic-bezier(0.22, 0.61, 0.36, 1);
    box-sizing: border-box;
  }

  .pp-mobile-drawer:not([hidden]) .pp-mobile-drawer-inner {
    transform: translateY(0) scale(1);
  }

  .pp-drawer-close {
    position: absolute;
    top: 14px;
    right: 16px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--pp-text-600);
  }

  .pp-mobile-drawer-inner::before {
    content: "CATEGORIES";
    display: block;
    margin-bottom: 14px;
    text-align: center;
    font-size: 14px;
    letter-spacing: 0.14em;
    font-weight: 700;
    color: var(--pp-text-700);
  }

  .pp-mobile-drawer-inner::after {
    content: "";
    display: block;
    width: 85%;
    height: 1px;
    margin: 0 auto 16px;
    background: var(--pp-border-subtle);
  }

  .pp-mobile-drawer .pp-category-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .pp-mobile-drawer .pp-category-item a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--pp-radius-md);
    font-size: 16px;
    font-weight: 500;
    color: var(--pp-text-900);
    text-align: center;
    transition: background var(--pp-trans-fast);
  }

  .pp-mobile-drawer .pp-category-item a:hover {
    background: var(--pp-surface-muted);
  }

  .pp-mobile-drawer .pp-category-item.is-active a {
    background: var(--pp-surface-muted);
    border: 1px solid var(--pp-border-structural);
    font-weight: 600;
  }
}


/* ============================================================
   PAGE AUTHORITY SPACING (H1 + Description)
   ============================================================ */
.page-title {
  margin-top: 4px;
  margin-bottom: 8px;
  font-size: var(--pp-h1-size);
  font-weight: var(--pp-h1-weight);
  letter-spacing: -0.01em;
}

.desc {
  margin-bottom: 18px;
  font-size: var(--pp-body-size);
  line-height: 1.6;
  color: var(--pp-text-700);
}


/* ============================================================
   PANEL STACK CONTINUITY ACROSS FRAME BOUNDARY
   Ensures rhythm between last panel inside .pp-frame
   and next external pp-panel (e.g., Tutorial)
   ============================================================ */
.pp-panel + .pp-frame,
.pp-frame + .pp-panel,
.pp-frame + .pp-guide-region {
  margin-top: var(--pp-panel-gap);
}

.pp-guide-region {
  min-width: 0;
}

@media (max-width: 1023px) {
  .pp-main + .pp-sidebar,
  .pp-shell > .pp-sidebar {
    margin-top: 24px;
  }
}

.pp-panel--analyzer + .pp-panel--scenario.guide-panel,
.pp-panel--analyzer + .pp-panel.guide-panel,
.pp-panel--analyzer + .pp-panel {
  margin-top: 28px;
}