/* ==========================================================================
   HubWorlds — TigerHub Life Essay Hub
   Pure CSS • System fonts • No external dependencies
   D3: asymmetric_span_system • D4: mixed_contained_and_full_bleed
   ========================================================================== */

/* --------------------------------------------------------------------------
   TOKENS — spacing, width, typography, surfaces, borders
   -------------------------------------------------------------------------- */
:root {
  /* Spacing scale (rhythmic) */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-s: 0.75rem;
  --space-m: 1rem;
  --space-l: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 2.5rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  --space-5xl: 5rem;

  /* Width tokens — D4 */
  --w-narrow: 42rem;   /* Wn readable */
  --w-base: 56rem;     /* Wb */
  --w-wide: 72rem;     /* Ww */
  --w-extra: 88rem;    /* Wx */
  --w-inset: 36rem;    /* Wi */
  --w-full: 100%;      /* Wf */

  /* Gutter / gap — GG4 rhythmic_variable */
  --gutter-tight: var(--space-m);
  --gutter-base: var(--space-xl);
  --gutter-wide: var(--space-2xl);
  --gutter-spotlight: var(--space-3xl);

  /* Typography scale */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", monospace;
  --text-xs: 0.8125rem;
  --text-s: 0.875rem;
  --text-m: 1rem;
  --text-l: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --line-tight: 1.25;
  --line-normal: 1.5;
  --line-relaxed: 1.65;

  /* Surfaces & borders */
  --surface-page: #fafaf9;
  --surface-panel: #fff;
  --surface-band: #f5f4f2;
  --surface-accent: #ebe9e6;
  --border-subtle: 1px solid #e7e5e2;
  --border-strong: 1px solid #d4d2ce;
  --radius-s: 4px;
  --radius-m: 6px;
  --radius-panel: 8px;
  --shadow-panel: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.04);

  /* Focus */
  --focus-ring: 2px solid #1a1a1a;
  --focus-offset: 2px;
}

/* --------------------------------------------------------------------------
   BASE — reset, box-sizing, minimal defaults
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-m);
  line-height: var(--line-normal);
  color: #1a1a1a;
  background: var(--surface-page);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

/* --------------------------------------------------------------------------
   TYPOGRAPHY
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
  line-height: var(--line-tight);
  font-weight: 600;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-l); }

p {
  margin: 0 0 var(--space-m);
}

p:last-child {
  margin-bottom: 0;
}

.eyebrow {
  font-size: var(--text-s);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #6b6b6b;
}

/* --------------------------------------------------------------------------
   LAYOUT — grid, containers, width bands
   D3: 12_col_standard • SG5 alternating_asymmetry
   -------------------------------------------------------------------------- */
.layout-wrap {
  width: 100%;
  max-width: var(--container-max, var(--w-wide));
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter-base);
  padding-right: var(--gutter-base);
}

.layout-wrap--narrow { --container-max: var(--w-narrow); }
.layout-wrap--wide   { --container-max: var(--w-wide); }
.layout-wrap--extra  { --container-max: var(--w-extra); }
.layout-wrap--inset { --container-max: var(--w-inset); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap, var(--gutter-base));
  align-items: start;
}

.span-5 { grid-column: span 5; }
.span-7 { grid-column: span 7; }
.span-12 { grid-column: span 12; }

/* Asymmetric splits: 5/7 and 7/5 */
.hero .grid-12 { --grid-gap: var(--gutter-wide); }
.semester-phases .grid-12 { --grid-gap: var(--gutter-tight); }
.situations .grid-12 { --grid-gap: var(--gutter-base); }
.spotlight .grid-12 { --grid-gap: var(--gutter-spotlight); }

/* Full-bleed band backgrounds — BR4 */
.band {
  width: 100%;
  background: var(--surface-band);
}
.band .layout-wrap {
  padding-top: var(--section-pad, var(--space-3xl));
  padding-bottom: var(--section-pad, var(--space-3xl));
}

/* --------------------------------------------------------------------------
   COMPONENTS — header, nav, hero, gateway, situations, spotlight, archive
   -------------------------------------------------------------------------- */

/* --- Header / compact nav --- */
.site-header {
  background: var(--surface-panel);
  border-bottom: var(--border-subtle);
  padding: var(--space-m) 0;
}

.site-header .layout-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
  padding-top: var(--space-s);
  padding-bottom: var(--space-s);
}

.site-brand {
  font-size: var(--text-l);
  font-weight: 600;
}

.site-brand a {
  color: inherit;
}
.site-brand a:hover {
  text-decoration: none;
  opacity: 0.85;
}

.nav-main {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s) var(--space-l);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-main a {
  color: #374151;
  font-size: var(--text-s);
  font-weight: 500;
}

.nav-toggle {
  display: none;
  background: none;
  border: var(--border-subtle);
  padding: var(--space-xs) var(--space-s);
  font-size: var(--text-s);
  cursor: pointer;
  border-radius: var(--radius-s);
}

/* --- Hero D1: dual_path_cta_hero --- */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  background: var(--surface-panel);
  border-bottom: var(--border-subtle);
}

.hero .layout-wrap {
  --container-max: var(--w-extra);
}

.hero__content {
  /* left block: intro text */
}

.hero__actions {
  /* right: choose path panel */
  background: var(--surface-band);
  padding: var(--space-xl);
  border-radius: var(--radius-panel);
  border: var(--border-subtle);
}

.hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m);
  margin-top: var(--space-l);
  align-items: center;
}

.hero__cta-row .btn {
  flex-shrink: 0;
}

.hero__reassurance {
  font-size: var(--text-s);
  color: #6b6b6b;
  margin-top: var(--space-m);
}

/* Semester signals strip — mini cards below hero */
.signals-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: var(--border-subtle);
}

.signal-card {
  flex: 1 1 8rem;
  min-width: 7rem;
  padding: var(--space-s) var(--space-m);
  background: var(--surface-page);
  border: var(--border-subtle);
  border-radius: var(--radius-m);
  font-size: var(--text-s);
  font-weight: 500;
}

.signal-card span {
  display: block;
  font-size: var(--text-xs);
  font-weight: 400;
  color: #6b6b6b;
  margin-top: var(--space-2xs);
}

/* Identity / disclaimer aside */
.identity-panel {
  font-size: var(--text-s);
  color: #6b6b6b;
  margin-top: var(--space-l);
  padding-top: var(--space-m);
  border-top: var(--border-subtle);
}

.identity-panel strong {
  color: #374151;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-s) var(--space-l);
  font-size: var(--text-s);
  font-weight: 500;
  font-family: inherit;
  border-radius: var(--radius-m);
  border: var(--border-strong);
  background: var(--surface-panel);
  color: #1a1a1a;
  cursor: pointer;
  text-align: center;
}

.btn:hover {
  background: var(--surface-band);
  text-decoration: none;
}

.btn--primary {
  background: #1a1a1a;
  color: #fff;
  border-color: #1a1a1a;
}

.btn--primary:hover {
  background: #374151;
  border-color: #374151;
  color: #fff;
}

/* --- Sticky jump nav (after hero) --- */
.jump-nav {
  background: var(--surface-panel);
  border-bottom: var(--border-subtle);
  padding: var(--space-s) 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.jump-nav .layout-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  align-items: center;
}

.jump-nav a {
  font-size: var(--text-s);
  color: #374151;
  padding: var(--space-2xs) var(--space-s);
  border-radius: var(--radius-s);
}

.jump-nav a:hover {
  background: var(--surface-band);
  text-decoration: none;
}

.jump-nav.is-sticky-visible {
  box-shadow: var(--shadow-soft);
}

/* --- Semester Phases gateway — C5 segment_choice_gateway --- */
.semester-phases {
  padding: var(--space-3xl) 0;
}

.semester-phases .layout-wrap {
  --container-max: var(--w-wide);
}

.section-head {
  margin-bottom: var(--space-xl);
}

.section-head h2 {
  margin: 0 0 var(--space-xs);
}

.section-head p {
  margin: 0;
  font-size: var(--text-s);
  color: #6b6b6b;
}

.phase-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr));
  gap: var(--gutter-tight);
}

.phase-block {
  padding: var(--space-l);
  background: var(--surface-panel);
  border: var(--border-subtle);
  border-radius: var(--radius-m);
}

.phase-block h3 {
  margin: 0 0 var(--space-xs);
  font-size: var(--text-m);
}

.phase-block p {
  margin: 0;
  font-size: var(--text-s);
  color: #4b5563;
}

.phase-block a {
  display: inline-block;
  margin-top: var(--space-s);
  font-size: var(--text-s);
  font-weight: 500;
}

/* --- Common Situations — R3 category_blocks_with_links --- */
.situations {
  padding: var(--space-3xl) 0;
  background: var(--surface-band);
}

.situations .layout-wrap {
  --container-max: var(--w-extra);
}

.situation-groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: var(--gutter-base);
}

.situation-group {
  padding: var(--space-l);
  background: var(--surface-panel);
  border: var(--border-subtle);
  border-radius: var(--radius-m);
}

.situation-group h3 {
  margin: 0 0 var(--space-s);
  font-size: var(--text-l);
  padding-bottom: var(--space-xs);
  border-bottom: var(--border-subtle);
}

.situation-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.situation-group li {
  margin-bottom: var(--space-xs);
}

.situation-group .label {
  font-size: var(--text-xs);
  color: #6b6b6b;
  margin-top: var(--space-2xs);
}

/* --- Featured spotlight — R2 featured_resource_plus_list --- */
.spotlight {
  padding: var(--space-3xl) 0;
}

.spotlight .layout-wrap {
  --container-max: var(--w-wide);
}

.featured-panel {
  padding: var(--space-2xl);
  background: var(--surface-band);
  border: var(--border-subtle);
  border-radius: var(--radius-panel);
  margin-bottom: var(--space-xl);
}

.featured-panel h2 {
  margin: 0 0 var(--space-m);
}

.featured-panel .meta {
  font-size: var(--text-s);
  color: #6b6b6b;
  margin-bottom: var(--space-m);
}

.featured-panel p {
  margin: 0 0 var(--space-l);
}

.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.related-list li {
  padding: var(--space-s) 0;
  border-bottom: var(--border-subtle);
}

.related-list li:last-child {
  border-bottom: none;
}

.next-read-row {
  margin-top: var(--space-xl);
  padding-top: var(--space-l);
  border-top: var(--border-subtle);
}

/* --- Full archive rows — R5 resource_rows_with_meta --- */
.archive {
  padding: var(--space-3xl) 0;
  background: var(--surface-band);
}

.archive .layout-wrap {
  --container-max: var(--w-wide);
}

.archive-rows {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.archive-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-l);
  align-items: baseline;
  padding: var(--space-m) 0;
  border-bottom: var(--border-subtle);
}

.archive-row:last-child {
  border-bottom: none;
}

.archive-row .meta-tags {
  font-size: var(--text-xs);
  color: #6b6b6b;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.archive-row .read-time {
  font-size: var(--text-s);
  color: #6b6b6b;
  white-space: nowrap;
}

.archive-helper-row {
  margin-top: var(--space-l);
  padding-top: var(--space-l);
  font-size: var(--text-s);
  color: #6b6b6b;
}

/* --- Reflection / How to use — X5 summary_box_with_detail_sections --- */
.reflection {
  padding: var(--space-3xl) 0;
}

.reflection .layout-wrap {
  --container-max: var(--w-narrow);
}

.summary-box {
  padding: var(--space-xl);
  background: var(--surface-accent);
  border: var(--border-subtle);
  border-radius: var(--radius-panel);
  margin-bottom: var(--space-2xl);
}

.summary-box p {
  margin: 0;
}

.guidance-blocks {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.guidance-block h3 {
  margin: 0 0 var(--space-s);
  font-size: var(--text-l);
}

.guidance-block p {
  margin: 0;
  font-size: var(--text-s);
  color: #4b5563;
}

/* --- Contact / operator panel — A6 multi_path_cta_panel --- */
.contact-panel-section {
  padding: var(--space-3xl) 0;
  background: var(--surface-band);
}

.contact-panel-section .layout-wrap {
  --container-max: var(--w-wide);
}

.multi-path-panel {
  max-width: var(--w-inset);
  margin: 0 auto;
  padding: var(--space-2xl);
  background: var(--surface-panel);
  border: var(--border-subtle);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
}

.multi-path-panel h2 {
  margin: 0 0 var(--space-l);
  text-align: center;
}

.contact-paths {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.contact-path {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-s);
  padding: var(--space-m) 0;
  border-bottom: var(--border-subtle);
}

.contact-path:last-child {
  border-bottom: none;
}

.contact-path .action {
  font-weight: 500;
}

.operator-line {
  margin-top: var(--space-xl);
  padding-top: var(--space-l);
  border-top: var(--border-subtle);
  font-size: var(--text-s);
  color: #6b6b6b;
  text-align: center;
}

/* --- Footer --- */
.site-footer {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-top: var(--border-subtle);
  background: var(--surface-panel);
}

.site-footer .layout-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer-col h4 {
  margin: 0 0 var(--space-s);
  font-size: var(--text-s);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: #6b6b6b;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin-bottom: var(--space-xs);
}

.footer-col a {
  font-size: var(--text-s);
  color: #4b5563;
}

.footer-micro {
  grid-column: 1 / -1;
  margin-top: var(--space-2xl);
  padding-top: var(--space-m);
  border-top: var(--border-subtle);
  font-size: var(--text-xs);
  color: #6b6b6b;
}

/* --------------------------------------------------------------------------
   POST TEMPLATE — article layout, side panel, breadcrumb
   -------------------------------------------------------------------------- */
.breadcrumb-bar {
  padding: var(--space-s) 0;
  font-size: var(--text-s);
  color: #6b6b6b;
  border-bottom: var(--border-subtle);
}

.breadcrumb-bar a {
  color: inherit;
}

.article-intro {
  padding: var(--space-2xl) 0;
}

.article-intro .meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m);
  font-size: var(--text-s);
  color: #6b6b6b;
  margin-top: var(--space-m);
}

.article-body-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
}

@media (min-width: 769px) {
  .article-body-wrap {
    grid-template-columns: 1fr minmax(14rem, 20rem);
  }
}

.article-intro__lead {
  font-size: var(--text-l);
  line-height: var(--line-relaxed);
  color: #374151;
}

.article-body {
  min-width: 0;
}

.article-body .prose {
  max-width: 42rem;
}

.side-panel {
  padding: var(--space-l);
  background: var(--surface-band);
  border: var(--border-subtle);
  border-radius: var(--radius-m);
}

.side-panel h3 {
  margin: 0 0 var(--space-s);
  font-size: var(--text-m);
}

.side-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-panel li {
  margin-bottom: var(--space-xs);
  font-size: var(--text-s);
}

.side-panel-toggle {
  display: none;
  margin-bottom: var(--space-m);
}

.related-articles-section {
  padding: var(--space-2xl) 0;
  border-top: var(--border-subtle);
}

.related-articles-section h2 {
  margin: 0 0 var(--space-l);
}

.related-group {
  margin-bottom: var(--space-xl);
}

.related-group:last-child {
  margin-bottom: 0;
}

.related-group h3 {
  font-size: var(--text-m);
  margin: 0 0 var(--space-s);
  color: #6b6b6b;
}

.related-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.related-group li {
  padding: var(--space-xs) 0;
  border-bottom: var(--border-subtle);
}

.related-group li:last-child {
  border-bottom: none;
}

/* --------------------------------------------------------------------------
   UTILITIES
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   RESPONSIVE — 4 breakpoints
   D3: CL3 featured_first_then_stack, CL4 aside_to_inline_panel
   -------------------------------------------------------------------------- */

/* Tablet */
@media (max-width: 768px) {
  .grid-12 .span-5,
  .grid-12 .span-7 {
    grid-column: span 12;
  }

  .hero__content {
    order: 1;
  }

  .hero__actions {
    order: 2;
  }

  .archive-row {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .archive-row .read-time {
    order: -1;
  }

  .site-footer .layout-wrap {
    grid-template-columns: 1fr;
  }

  .contact-path {
    flex-direction: column;
    align-items: flex-start;
  }

  .phase-blocks {
    grid-template-columns: 1fr;
  }

  .situation-groups {
    grid-template-columns: 1fr;
  }
}

/* Scroll margin for anchor targets (sticky nav offset) */
#semester-phases,
#situations,
#featured,
#archive,
#how-to-use,
#contact-panel {
  scroll-margin-top: 3.5rem;
}

/* Mobile: nav toggle, stack hero, collapsible side panel */
@media (max-width: 600px) {
  .nav-toggle {
    display: block;
  }

  .nav-main {
    display: none;
    width: 100%;
    flex-direction: column;
  }

  .nav-main.is-open {
    display: flex;
  }

  .layout-wrap {
    padding-left: var(--space-m);
    padding-right: var(--space-m);
  }

  .hero {
    padding: var(--space-2xl) 0;
  }

  .hero__cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__cta-row .btn {
    width: 100%;
  }

  .signals-strip {
    flex-direction: column;
  }

  .side-panel-toggle {
    display: block;
  }

  .side-panel.collapsible .side-panel-content {
    display: none;
  }

  .side-panel.collapsible.is-open .side-panel-content {
    display: block;
  }

  .article-body-wrap {
    grid-template-columns: 1fr;
  }

  .multi-path-panel {
    padding: var(--space-l);
  }
}

/* Desktop: asymmetric hero 7/5 or 5/7 */
@media (min-width: 769px) {
  .hero .grid-12 > .hero__content {
    grid-column: span 7;
  }

  .hero .grid-12 > .hero__actions {
    grid-column: span 5;
  }
}

/* Wide: optional 5/7 alternation for other sections */
@media (min-width: 1024px) {
  .featured-panel {
    grid-column: span 8;
  }

  .spotlight .related-list-wrap {
    grid-column: span 4;
  }
}