/* ============================================
   SAGEO — Design System
   Premium. Authoritative. No fluff.
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #0a0a0f;
  --color-bg-alt: #111118;
  --color-bg-card: #16161f;
  --color-surface: #1c1c28;
  --color-border: #2a2a3a;
  --color-text: #e8e8f0;
  --color-text-muted: #9898a8;
  --color-text-dim: #6a6a7a;
  --color-accent: #6366f1;
  --color-accent-light: #818cf8;
  --color-accent-glow: rgba(99, 102, 241, 0.15);
  --color-gold: #f59e0b;
  --color-gold-light: #fbbf24;
  --color-seo: #10b981;
  --color-aeo: #6366f1;
  --color-geo: #f59e0b;
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-gold-light); }
a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 2px; }

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

/* --- Utility --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 3rem); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.text-gradient {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-gold-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), padding var(--transition);
}

.nav.scrolled { border-bottom-color: var(--color-border); padding: 0.65rem 0; }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.nav__logo span { color: var(--color-accent-light); }

.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav__links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

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

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-text);
}

.nav__toggle svg { width: 24px; height: 24px; }

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 8rem 0 6rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero__badge span { color: var(--color-accent-light); }

.hero__title {
  font-size: clamp(2.75rem, 6.5vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.hero__cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--primary:hover { background: var(--color-accent-light); color: #fff; transform: translateY(-1px); }

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover { border-color: var(--color-text-muted); color: var(--color-text); }

/* --- Definition --- */
.definition {
  padding: 6rem 0;
  border-top: 1px solid var(--color-border);
}

.definition__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: clamp(2rem, 4vw, 3.5rem);
  position: relative;
  overflow: hidden;
}

.definition__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-seo), var(--color-aeo), var(--color-geo));
}

.definition__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent-light);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.definition__term {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
}

.definition__pronunciation {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-text-dim);
  margin-bottom: 1.5rem;
}

.definition__text {
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 720px;
}

.definition__text strong { color: var(--color-text); font-weight: 600; }

.definition__origin {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.definition__origin a { font-weight: 600; }

/* --- Problem --- */
.problem {
  padding: 6rem 0;
}

.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 1rem;
}

.section__title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  max-width: 700px;
}

.section__lead {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 680px;
  margin-bottom: 3rem;
}

/* Three-column grid */
.three-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.pillar-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}

.pillar-card:hover { border-color: var(--color-text-dim); transform: translateY(-2px); }

.pillar-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
}

.pillar-card--seo .pillar-card__icon { background: rgba(16, 185, 129, 0.12); color: var(--color-seo); }
.pillar-card--aeo .pillar-card__icon { background: rgba(99, 102, 241, 0.12); color: var(--color-aeo); }
.pillar-card--geo .pillar-card__icon { background: rgba(245, 158, 11, 0.12); color: var(--color-geo); }

.pillar-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.pillar-card__desc {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* --- The Problem visual separator --- */
.problem__disconnect {
  margin-top: 3rem;
  padding: 2rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-gold);
}

.problem__disconnect p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.problem__disconnect strong { color: var(--color-gold-light); }

/* --- What SAGEO Involves --- */
.involves {
  padding: 6rem 0;
  border-top: 1px solid var(--color-border);
}

.involves__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.involves__item {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.involves__item:hover { border-color: var(--color-accent); }

.involves__item-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--color-accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.involves__item-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.involves__item-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Quote / Manifesto --- */
.manifesto {
  padding: 6rem 0;
}

.manifesto__block {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.manifesto__quote {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.manifesto__attribution {
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.manifesto__attribution a { font-weight: 600; color: var(--color-accent-light); }

/* --- Practitioners --- */
.practitioners {
  padding: 6rem 0;
  border-top: 1px solid var(--color-border);
}

.practitioners__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.practitioners__text p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: 1rem;
}

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

.practitioners__checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.practitioners__checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.practitioners__checklist li::before {
  content: '✓';
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-seo);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 2px;
}

/* --- CTA --- */
.cta {
  padding: 6rem 0;
}

.cta__card {
  background: linear-gradient(135deg, var(--color-bg-card), var(--color-surface));
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: clamp(2.5rem, 5vw, 4rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta__card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  position: relative;
}

.cta__text {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
  position: relative;
}

.cta__actions { position: relative; display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* --- Footer --- */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__text {
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer__links a {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  transition: color var(--transition);
}

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

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .three-grid { grid-template-columns: 1fr; }
  .involves__grid { grid-template-columns: 1fr; }
  .practitioners__content { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem clamp(1.25rem, 4vw, 3rem);
    gap: 1rem;
  }
  .nav__toggle { display: block; }
  .hero { padding: 7rem 0 4rem; min-height: auto; }
  .hero__cta-row { flex-direction: column; align-items: flex-start; }
  .btn { width: 100%; justify-content: center; }
  .definition, .problem, .involves, .manifesto, .practitioners, .cta { padding: 4rem 0; }
}

/* ============================================
   Blog Styles
   ============================================ */

/* --- Blog Hub --- */
.blog-hero {
  padding: 8rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.blog-hero__title {
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 0.75rem;
}

.blog-hero__subtitle {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--color-text-muted);
  max-width: 600px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
  padding: 4rem 0 6rem;
}

.blog-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), transform var(--transition);
}

.blog-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.blog-card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 0.75rem;
}

.blog-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.blog-card__title a {
  color: var(--color-text);
  text-decoration: none;
}

.blog-card__title a:hover {
  color: var(--color-accent-light);
}

.blog-card__excerpt {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1.25rem;
}

.blog-card__meta {
  font-size: 0.775rem;
  color: var(--color-text-dim);
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

/* --- Blog Article --- */
.blog-article__header {
  padding: 8rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.blog-article__back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-dim);
  margin-bottom: 2rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.blog-article__back:hover {
  color: var(--color-accent-light);
}

.blog-article__title {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  max-width: 780px;
}

.blog-article__meta {
  font-size: 0.875rem;
  color: var(--color-text-dim);
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.blog-article__meta a {
  color: var(--color-accent-light);
  font-weight: 600;
}

/* Article Body */
.blog-article__body {
  max-width: 780px;
  padding-top: 3rem;
  padding-bottom: 4rem;
}

.blog-article__body .tldr {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-bottom: 2.5rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  border-left: 3px solid var(--color-accent);
}

.blog-article__body .tldr strong {
  color: var(--color-text);
}

.blog-article__body h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.blog-article__body h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.blog-article__body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.blog-article__body h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-accent-light);
}

.blog-article__body p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.blog-article__body p strong {
  color: var(--color-text);
  font-weight: 600;
}

.blog-article__body ul,
.blog-article__body ol {
  margin: 1rem 0 1.5rem 1.25rem;
  color: var(--color-text-muted);
}

.blog-article__body li {
  font-size: 0.975rem;
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.blog-article__body li strong {
  color: var(--color-text);
}

.blog-article__body blockquote {
  border-left: 3px solid var(--color-gold);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--color-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.blog-article__body blockquote p {
  color: var(--color-text);
  font-style: italic;
  margin-bottom: 0;
}

.blog-article__body pre {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

.blog-article__body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--color-accent-light);
}

.blog-article__body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.blog-article__body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 3rem 0;
}

/* FAQ section in article */
.blog-article__body .faq-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.blog-article__body .faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
}

.blog-article__body .faq-item h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 0.5rem 0;
}

.blog-article__body .faq-item p {
  font-size: 0.925rem;
  margin-bottom: 0;
  line-height: 1.7;
}

/* Related articles */
.blog-related {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--color-border);
}

.blog-related__title {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 1rem;
}

.blog-related__links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.blog-related__links a {
  font-size: 0.95rem;
  color: var(--color-accent-light);
  font-weight: 500;
}

.blog-related__links a:hover {
  color: var(--color-gold-light);
}

/* Responsive blog */
@media (max-width: 768px) {
  .blog-grid {
    grid-template-columns: 1fr;
    padding: 3rem 0 4rem;
  }
  .blog-article__header {
    padding: 7rem 0 2rem;
  }
  .blog-article__body {
    padding-top: 2rem;
  }
  .blog-article__body h2 {
    margin-top: 2rem;
    padding-top: 1.5rem;
  }
}

/* --- Print --- */
@media print {
  .nav, .cta { display: none; }
  body { background: #fff; color: #111; }
  .hero { min-height: auto; padding: 2rem 0; }
}