/* ==========================================================================
   aisummitguide.site — base stylesheet
   Shared across all 15 pages. Loaded externally so it caches between pages.

   NOTE — PLACEHOLDER PALETTE:
   Brand colors below are neutral grays on purpose. The real palette
   (from aibusinesssummit.com reference) has not been confirmed yet.
   Do not hardcode any other color anywhere — only edit the --color-*
   tokens in :root below once the reference is approved.
   ========================================================================== */

/* ---- Reset -------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body,
h1, h2, h3, h4, p,
figure, blockquote, dl, dd {
  margin: 0;
}

ul[class], ol[class] {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

input, button, textarea, select {
  font: inherit;
}

a {
  color: inherit;
}

/* ---- Design tokens -------------------------------------------------------
   Brand palette confirmed 2026-08-23 from aibusinesssummit.com hero
   reference (see FACTS.md): near-black background with orange glow,
   vivid orange accent, bold uppercase headlines. Applied here as an
   accent/CTA color on a light content layout (this site is 15 pages
   of review content, not a sales landing page) — the dark treatment
   lives in --dark-* tokens for optional hero/CTA bands only.
   -------------------------------------------------------------------------- */
:root {
  /* Brand */
  --color-primary: #c2410c;
  --color-primary-dark: #9a3412;
  --color-accent: #f5760f;
  --color-accent-light: #ffaa33;
  --color-cta: #f5760f;
  --color-cta-text: #120b08;

  /* Dark hero/CTA band tokens (source brand's native look) */
  --dark-bg: #120b08;
  --dark-bg-alt: #1d120a;
  --dark-text: #ffffff;
  --dark-border: #f5760f;

  /* Neutral scale (content layout) */
  --color-bg: #ffffff;
  --color-bg-alt: #f7f4f1;
  --color-border: #e7e0d8;
  --color-text: #1c1815;
  --color-text-muted: #55504a;
  --color-text-faint: #79736b;

  /* Semantic */
  --color-success: #166534;
  --color-success-bg: #f0fdf4;
  --color-warning: #92400e;
  --color-warning-bg: #fffbeb;
  --color-info: #1e3a8a;
  --color-info-bg: #eff6ff;

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-heading: var(--font-body);

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  /* Layout */
  --content-width: 780px;
  --wide-width: 1120px;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);

  /* Sticky mobile CTA bar height, used to pad page bottom on small screens */
  --sticky-cta-height: 64px;
}

/* ---- Base ---------------------------------------------------------------- */
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  font-size: 17px;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.35rem, 3.6vw, 1.75rem);
  margin: var(--space-7) 0 var(--space-3);
}

h3 {
  font-size: 1.15rem;
  margin: var(--space-5) 0 var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

a {
  text-decoration-color: var(--color-border);
}

a:hover {
  text-decoration-color: currentColor;
}

/* ---- Layout ---------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--wide {
  max-width: var(--wide-width);
}

main {
  display: block;
  padding-bottom: var(--space-8);
}

section {
  padding-block: var(--space-4);
}

/* ---- Site header ---------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-3);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: none;
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
    gap: var(--space-5);
    font-size: 0.95rem;
  }

  .site-nav a {
    text-decoration: none;
    color: var(--color-text-muted);
  }

  .site-nav a:hover {
    color: var(--color-text);
  }
}

/* ---- Breadcrumbs ------------------------------------------------------------ */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-text-faint);
  padding-block: var(--space-3);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.breadcrumbs a {
  color: var(--color-text-faint);
  text-decoration: none;
}

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

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: var(--space-1);
  color: var(--color-border);
}

/* ---- Hero / page intro -------------------------------------------------- */
.page-hero {
  padding-block: var(--space-5) var(--space-6);
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.dek {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 60ch;
}

/* ---- Badges / pills ------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.8rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.badge--success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border-color: transparent;
}

.badge--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border-color: transparent;
}

.badge--info {
  background: var(--color-info-bg);
  color: var(--color-info);
  border-color: transparent;
}

/* ---- Verified-fact / last-checked strip ---------------------------------- */
.verified {
  font-size: 0.85rem;
  color: var(--color-text-faint);
  border-left: 3px solid var(--color-border);
  padding-left: var(--space-3);
  margin-block: var(--space-4);
}

/* ---- CTA buttons ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  padding: var(--space-3) var(--space-6);
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  min-height: 48px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn--primary {
  background: var(--color-cta);
  color: var(--color-cta-text);
  box-shadow: 0 4px 16px rgba(245, 118, 15, 0.35);
}

.btn--primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(245, 118, 15, 0.45);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--block {
  display: flex;
  width: 100%;
}

.cta-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  margin-block: var(--space-6);
}

/* Dark hero/CTA band — optional, brand-native treatment for above-the-fold
   hero sections only. Not used for body content. */
.hero-band {
  background: radial-gradient(ellipse at top, var(--dark-bg-alt), var(--dark-bg) 70%);
  color: var(--dark-text);
  padding-block: var(--space-7);
}

.hero-band h1,
.hero-band h2 {
  color: var(--dark-text);
}

.hero-band .dek {
  color: rgba(255, 255, 255, 0.75);
}

.hero-band .btn--primary {
  background: var(--dark-bg);
  color: var(--color-accent-light);
  border-color: var(--color-accent);
}

.hero-band .btn--primary:hover {
  background: #000;
}

.cta-box p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.cta-note {
  font-size: 0.78rem;
  color: var(--color-text-faint);
  margin-top: var(--space-2);
  margin-bottom: 0;
}

/* Sticky mobile CTA bar — small screens only */
.sticky-cta {
  display: none;
}

@media (max-width: 767px) {
  .sticky-cta {
    display: block;
    position: fixed;
    inset-inline: 0;
    bottom: 0;
    z-index: 50;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-4);
    padding-bottom: max(var(--space-2), env(safe-area-inset-bottom));
  }

  body:has(.sticky-cta) main {
    padding-bottom: calc(var(--space-8) + var(--sticky-cta-height));
  }
}

/* ---- Cards / grids --------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  background: var(--color-bg);
}

.card h3 {
  margin-top: 0;
}

/* ---- Pros / cons ----------------------------------------------------------- */
.pros-cons {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  margin-block: var(--space-5);
}

@media (min-width: 640px) {
  .pros-cons {
    grid-template-columns: 1fr 1fr;
  }
}

.pros-cons__col {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.pros-cons__col h3 {
  margin-top: 0;
  font-size: 1rem;
}

.pros-cons__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.pros-cons__col li {
  padding-left: var(--space-5);
  position: relative;
}

.pros-cons__col--pros li::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

.pros-cons__col--cons li::before {
  content: "\2212";
  position: absolute;
  left: 0;
  color: var(--color-warning);
  font-weight: 700;
}

/* ---- Comparison table -------------------------------------------------- */
.table-wrap {
  overflow-x: auto;
  margin-block: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 480px;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

thead th {
  background: var(--color-bg-alt);
  font-weight: 700;
}

tbody tr:last-child td {
  border-bottom: none;
}

/* ---- Compare-with block (product cross-links) --------------------------- */
.compare-with {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-block: var(--space-7);
}

.compare-with h2 {
  margin-top: 0;
}

.compare-with ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.compare-with a {
  font-weight: 600;
  text-decoration: none;
}

.compare-with a:hover {
  text-decoration: underline;
}

/* ---- FAQ (native accordion, no JS) --------------------------------------- */
.faq {
  margin-block: var(--space-6);
}

.faq details {
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-3);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--color-text-faint);
  flex-shrink: 0;
}

.faq details[open] summary::after {
  content: "\2212";
}

.faq details p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
}

/* ---- Internal links block ------------------------------------------------- */
.related-links {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-5);
  margin-top: var(--space-7);
}

.related-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* ---- Site footer ------------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding-block: var(--space-6);
  margin-top: var(--space-8);
  font-size: 0.85rem;
  color: var(--color-text-faint);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

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

.site-footer nav a:hover {
  text-decoration: underline;
}

.footer-disclosure {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: var(--wide-width);
}

.footer-disclosure p {
  margin: 0;
  color: var(--color-text-faint);
}

.footer-copyright {
  margin-top: var(--space-5);
  color: var(--color-text-faint);
}

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

/* ---- Content images -------------------------------------------------- */
.content-photo {
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-5);
}

.content-photo--small {
  max-width: 280px;
}

.content-photo--medium {
  max-width: 420px;
}

.content-photo--wide {
  max-width: 100%;
}

.content-photo--caption {
  font-size: 0.82rem;
  color: var(--color-text-faint);
  margin-top: calc(var(--space-2) * -1);
  margin-bottom: var(--space-5);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-faint {
  color: var(--color-text-faint);
}