/* ─── Design Tokens ─────────────────────────────────────────── */
:root {
  --color-primary:     #0A0A0A;
  --color-secondary:   #525252;
  --color-accent:      #00B4D8;
  --color-background:  #F5F4F0;
  --color-foreground:  #0A0A0A;
  --color-muted:       #E8E6E0;
  --color-border:      #D8D5CE;
  --color-surface:     #FFFFFF;
  --color-dark:        #0A0A0A;
  --color-dark-card:   #111111;

  --font-heading: 'DM Sans', sans-serif;
  --font-body:    'Inter', sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition: 150ms ease-out;
}

/* ─── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--color-background);
  color: var(--color-foreground);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(rgba(0,0,0,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ─── Layout ─────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow { max-width: 740px; }

/* ─── Header / Nav ──────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245,244,240,0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  height: 60px;
  display: flex;
  align-items: center;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}
.nav__logo span { color: var(--color-accent); }

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
}
.nav__links a {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-secondary);
  transition: color var(--transition);
}
.nav__links a:hover,
.nav__links a.active { color: var(--color-accent); }

/* ─── Hero ───────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 72px;
  border-bottom: 1px solid var(--color-border);
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 20px;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.75rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.0;
  color: var(--color-primary);
  max-width: 780px;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero__title em {
  font-style: normal;
  color: var(--color-accent);
}

.hero__subtitle {
  font-size: 1.0625rem;
  color: var(--color-secondary);
  max-width: 520px;
  line-height: 1.75;
  margin-bottom: 36px;
}

.hero__meta {
  font-size: 0.8125rem;
  color: var(--color-secondary);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.hero__meta span {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

/* ─── Section ────────────────────────────────────────────────── */
.section { padding: 64px 0; }

.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 40px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-primary);
}

.section__title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

/* ─── Tag Filter ─────────────────────────────────────────────── */
.tags-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.tag-btn {
  padding: 6px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.tag-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.tag-btn.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

/* ─── Post Grid ──────────────────────────────────────────────── */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

/* Featured */
.post-card--featured {
  grid-column: span 12;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}
.post-card--featured:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.post-card--featured .post-card__image-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--color-accent);
  overflow: hidden;
}

.post-card--featured .post-card__image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.post-card--featured .post-card__body {
  padding: 32px 36px;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
}

.post-card--featured .post-card__tag {
  color: var(--color-accent);
}

.post-card--featured .post-card__title {
  color: var(--color-primary);
  font-size: 1.75rem;
}

.post-card--featured .post-card__excerpt {
  color: var(--color-secondary);
}

.post-card--featured .post-card__footer {
  border-top-color: var(--color-border);
}

.post-card--featured .post-card__date {
  color: var(--color-secondary);
}

/* Regular cards */
.post-card:not(.post-card--featured) {
  grid-column: span 4;
}
.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.post-card__image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.post-card__image-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--color-accent);
}

.post-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card__tag {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.post-card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.post-card__excerpt {
  font-size: 0.875rem;
  color: var(--color-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

.post-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
}

.post-card__date {
  font-weight: 500;
  color: var(--color-secondary);
}

.post-card__read {
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent);
  transition: gap var(--transition);
}
.post-card:hover .post-card__read,
.post-card--featured:hover .post-card__read { gap: 8px; }

/* ─── Newsletter ─────────────────────────────────────────────── */
.newsletter {
  background: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
  margin: 0 0 64px;
}

.newsletter__title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

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

.newsletter__subtitle {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.65;
}

.newsletter__form {
  display: flex;
  gap: 10px;
  min-width: 320px;
}

.newsletter__input {
  flex: 1;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.06);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  outline: none;
  transition: border-color var(--transition);
}
.newsletter__input::placeholder { color: rgba(255,255,255,0.3); }
.newsletter__input:focus { border-color: var(--color-accent); }

.btn-accent {
  padding: 12px 22px;
  background: var(--color-accent);
  color: var(--color-dark);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity var(--transition), transform var(--transition);
}
.btn-accent:hover { opacity: 0.88; transform: translateY(-1px); }

/* ─── Footer ─────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer__logo {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-primary);
}
.footer__logo span { color: var(--color-accent); }

.footer__copy {
  font-size: 0.8125rem;
  color: var(--color-secondary);
}

.footer__links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.footer__links a {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-secondary);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--color-accent); }

/* ─── Post Page ──────────────────────────────────────────────── */
.post-header {
  padding: 48px 0 48px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 56px;
}

.post-header__cover {
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-height: 420px;
  margin-bottom: 28px;
}

.post-header__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.post-header__tag {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 18px;
  display: block;
}

.post-header__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.05;
  color: var(--color-primary);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.post-header__subtitle {
  font-size: 1.125rem;
  color: var(--color-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
}

.post-header__meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  color: var(--color-secondary);
  font-weight: 500;
}

.post-header__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Post body */
.post-body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-foreground);
}

.post-body h2 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  margin: 52px 0 16px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.post-body h3 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 36px 0 12px;
  letter-spacing: -0.01em;
}

.post-body p { margin-bottom: 24px; }

.post-body strong { font-weight: 700; color: var(--color-primary); }

.post-body blockquote {
  background: var(--color-dark);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin: 36px 0;
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  position: relative;
}

.post-body blockquote::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-accent);
  border-radius: 4px 0 0 4px;
}

.post-body ul, .post-body ol {
  padding-left: 20px;
  margin-bottom: 24px;
}

.post-body li { margin-bottom: 10px; }

.post-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 52px 0;
}

/* Post nav */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 64px 0 0;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

.post-nav__item {
  padding: 24px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  display: block;
}
.post-nav__item:hover {
  border-color: var(--color-accent);
  background: var(--color-surface);
}

.post-nav__label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.post-nav__title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.post-nav__item--next { text-align: right; }

/* ─── Philosophy Section ─────────────────────────────────────── */
.post-philosophy {
  background: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin: 56px 0;
}

.post-philosophy__label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.post-philosophy__label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.1);
}

.post-philosophy__item {
  border-left: 3px solid var(--color-accent);
  padding-left: 20px;
  margin-bottom: 28px;
}
.post-philosophy__item:last-child { margin-bottom: 0; }

.post-philosophy__quote {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.45;
  margin: 0 0 8px;
  font-style: italic;
}

.post-philosophy__author {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.03em;
}

/* ─── Sources Section ────────────────────────────────────────── */
.post-sources {
  border-top: 1px solid var(--color-border);
  padding-top: 36px;
  margin-top: 56px;
}

.post-sources__label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 20px;
  display: block;
}

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

.post-sources__item {
  font-size: 0.875rem;
  color: var(--color-secondary);
  padding: 12px 0;
  border-bottom: 1px solid var(--color-muted);
  line-height: 1.6;
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.post-sources__item:last-child { border-bottom: none; }

.post-sources__num {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 18px;
}

.post-sources__item em {
  font-style: italic;
  color: var(--color-foreground);
  font-weight: 500;
}

/* ─── Post Data Block ────────────────────────────────────────── */
.post-data {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin: 48px 0;
  background: var(--color-surface);
}

.post-data__label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}

.post-data__label::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.post-data__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.post-data__item {
  border-left: 2px solid var(--color-accent);
  padding-left: 16px;
}

.post-data__number {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

.post-data__number span {
  color: var(--color-accent);
}

.post-data__desc {
  font-size: 0.8125rem;
  color: var(--color-secondary);
  line-height: 1.5;
}

.post-data__source {
  font-size: 0.6875rem;
  color: var(--color-border);
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-muted);
}

@media (max-width: 600px) {
  .post-data__grid { grid-template-columns: 1fr; gap: 16px; }
  .post-data { padding: 24px 20px; }
}

/* ─── Post Infographic ───────────────────────────────────────── */
.post-infographic {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin: 48px 0;
  overflow: hidden;
}

.post-infographic__label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}

.post-infographic__label::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.infographic-compare {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.infographic-compare__header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--color-muted);
  border-bottom: 1.5px solid var(--color-border);
}

.infographic-compare__header span {
  padding: 10px 16px;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
}

.infographic-compare__header span:first-child {
  border-right: 1.5px solid var(--color-border);
}

.infographic-compare__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--color-muted);
}

.infographic-compare__row:last-child {
  border-bottom: none;
}

.infographic-compare__row span {
  padding: 14px 16px;
  font-size: 0.9375rem;
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-secondary);
}

.infographic-compare__row span:first-child {
  border-right: 1.5px solid var(--color-border);
}

.infographic-compare__row span:last-child {
  color: var(--color-primary);
  font-weight: 700;
  background: rgba(0,180,216,0.05);
}

.post-infographic svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .post-card--featured { grid-template-columns: 1fr; }
  .post-card--featured .post-card__image-placeholder { min-height: 200px; }
  .newsletter { grid-template-columns: 1fr; gap: 28px; }
  .newsletter__form { min-width: unset; width: 100%; }
}

@media (max-width: 768px) {
  .post-card { grid-column: span 12; }
  .nav__links { display: none; }
  .hero { padding: 48px 0 40px; }
  .newsletter { padding: 32px 24px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav__item--next { text-align: left; }
}

@media (max-width: 480px) {
  .section { padding: 40px 0; }
  .container { padding: 0 16px; }
  .hero__title { font-size: 2.25rem; }
  .post-infographic { padding: 24px 20px; }
  .infographic-compare__row span { font-size: 0.8125rem; padding: 10px 10px; }
}

/* ─── Animations ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  .post-card, .post-card--featured {
    animation: fadeUp 0.5s ease-out both;
  }
  .post-card:nth-child(2) { animation-delay: 0.06s; }
  .post-card:nth-child(3) { animation-delay: 0.12s; }
  .post-card:nth-child(4) { animation-delay: 0.18s; }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}