/* ============================================================
   STORYCRAFTONLINE — Main Stylesheet
   Design System: Architectural Narratism
   ============================================================ */

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

/* ── CSS Variables (Light Mode Default) ───────────────────── */
:root {
  --color-bg:           #F0F1F4;
  --color-fg:           #16181A;
  --color-accent:       #B8583D;
  --color-slate:        #4A5A68;
  --color-slate-alpha:  rgba(74, 90, 104, 0.12);
  --color-slate-border: rgba(74, 90, 104, 0.35);

  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans:  'Space Grotesk', system-ui, -apple-system, sans-serif;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6.5rem;

  --container-max: 1440px;
  --nav-height:    64px;
  --grid-gap:      1px;

  --ease-snap:  150ms linear;
  --ease-hover: 400ms linear;
}

/* ── Dark Mode ────────────────────────────────────────────── */
[data-theme="dark"] {
  --color-bg:           #16181A;
  --color-fg:           #C8CDD6;
  --color-accent:       #B8583D;
  --color-slate:        #6A8898;
  --color-slate-alpha:  rgba(106, 136, 152, 0.12);
  --color-slate-border: rgba(106, 136, 152, 0.3);
}

/* ── Base ─────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 300ms ease, color 300ms ease;
}

img {
  display: block;
  max-width: 100%;
  object-fit: cover;
}

a { color: inherit; text-decoration: none; }
button { font-family: var(--font-sans); }

/* ── Layout Container ─────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ── Navigation ───────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-slate-border);
  display: flex;
  align-items: center;
  transition: background-color 300ms ease;
}

.nav__inner {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-md);
}

.nav__logo {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-fg);
  white-space: nowrap;
}

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

.nav__links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
  justify-content: center;
}

.nav__links a {
  font-family: var(--font-sans);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-slate);
  transition: color var(--ease-snap);
  position: relative;
  padding-bottom: 2px;
}

.nav__links a:hover,
.nav__links a.active { color: var(--color-fg); }

.nav__links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
}

.nav__actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

/* ── Burger Button ────────────────────────────────────────── */
.nav__burger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: 1px solid var(--color-slate-border);
  width: 34px;
  height: 34px;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--ease-snap);
  flex-shrink: 0;
}

.nav__burger:hover { border-color: var(--color-fg); }

.nav__burger span {
  display: block;
  width: 14px;
  height: 1px;
  background: var(--color-fg);
  transition: transform 200ms linear, opacity 200ms linear;
}

.nav__burger.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ── Mobile Nav Overlay ───────────────────────────────────── */
.nav__mobile {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--color-fg);
  transform: translateX(100%);
  transition: transform 280ms linear;
  display: flex;
  flex-direction: column;
  padding: var(--space-md) var(--space-sm);
  overflow-y: auto;
}

[data-theme="dark"] .nav__mobile { background: #0E1012; }

.nav__mobile.is-open { transform: translateX(0); }

.nav__mobile-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--space-xl);
  flex-shrink: 0;
}

.nav__mobile-logo {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(200, 205, 214, 0.7);
}

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

.nav__mobile-close {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.18);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: rgba(200, 205, 214, 0.7);
  transition: border-color var(--ease-snap), color var(--ease-snap);
  flex-shrink: 0;
}

.nav__mobile-close:hover {
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.nav__mobile-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1;
}

.nav__mobile-links li {
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.nav__mobile-links a {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 10vw, 2.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: rgba(200, 205, 214, 0.45);
  padding: var(--space-md) 0;
  transition: color var(--ease-snap);
}

.nav__mobile-links a:hover { color: rgba(200, 205, 214, 0.9); }
.nav__mobile-links a.active { color: var(--color-accent); }

.nav__mobile-footer {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(200, 205, 214, 0.25);
  flex-shrink: 0;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-slate-border);
  cursor: pointer;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-slate);
  transition: border-color var(--ease-snap), color var(--ease-snap);
}

.theme-toggle:hover {
  border-color: var(--color-fg);
  color: var(--color-fg);
}

.icon-moon { display: none; }
.icon-sun  { display: block; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="dark"] .icon-sun  { display: none; }

/* ── Hero — Home ──────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - var(--nav-height));
  border-bottom: 1px solid var(--color-slate-border);
  overflow: hidden;
}

.hero__content {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-2xl) var(--space-xl) var(--space-xl);
  gap: var(--space-lg);
  border-right: 1px solid var(--color-slate-border);
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero__eyebrow-line {
  width: 36px;
  height: 1px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.hero__eyebrow-text {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.hero__headline {
  font-family: var(--font-serif);
  font-size: clamp(3.25rem, 6vw, 7rem);
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: -0.03em;
}

.hero__headline em {
  font-style: italic;
  color: var(--color-accent);
}

.hero__descriptor {
  max-width: 440px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-slate);
  line-height: 1.7;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: 1px solid var(--color-fg);
  padding: 14px 28px;
  width: fit-content;
  transition: background-color var(--ease-snap), color var(--ease-snap);
}

.hero__cta:hover {
  background: var(--color-fg);
  color: var(--color-bg);
}

.hero__image-wrap {
  overflow: hidden;
  position: relative;
  background: var(--color-slate-alpha);
}

.hero__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-hover);
}

.hero__image-wrap:hover img { transform: scale(1.02); }

.hero__tag {
  position: absolute;
  bottom: var(--space-md);
  right: var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-slate-border);
  padding: 7px 14px;
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-slate);
}

/* ── Stats Bar ────────────────────────────────────────────── */
.stats-bar {
  border-bottom: 1px solid var(--color-slate-border);
}

.stats-bar__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--color-slate-border);
  gap: var(--grid-gap);
}

.stats-bar__item {
  background: var(--color-bg);
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 5px;
  transition: background-color var(--ease-snap);
}

.stats-bar__number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-fg);
}

.stats-bar__label {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-slate);
}

/* ── Section Heading Bar ──────────────────────────────────── */
.section-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-slate-border);
  border-bottom: 1px solid var(--color-slate-border);
}

.section-bar__label {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-slate);
  white-space: nowrap;
}

.section-bar__rule {
  flex: 1;
  height: 1px;
  background: var(--color-slate-border);
}

.section-bar__count {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-slate);
  white-space: nowrap;
}

/* ── Article Card ─────────────────────────────────────────── */
.card {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 300px;
  background: var(--color-bg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  transition: background-color var(--ease-snap);
}

.card:hover { background: var(--color-bg); }

.card__img-wrap {
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-slate-alpha);
}

.card__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-hover);
  display: block;
}

.card:hover .card__img-wrap img { transform: scale(1.02); }

.card__body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.card__protocol {
  font-family: var(--font-sans);
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.card__category {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.card__title {
  font-family: var(--font-serif);
  font-size: clamp(0.9375rem, 1.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  transition: color var(--ease-snap);
}

.card:hover .card__title { color: var(--color-accent); }

.card__excerpt {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--color-slate);
  line-height: 1.65;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  margin-top: auto;
  border-top: 1px solid var(--color-slate-alpha);
}

.card__meta {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.card__cta {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-slate);
  transition: color var(--ease-snap);
}

.card:hover .card__cta { color: var(--color-accent); }

/* Card size modifiers */
.card--feature .card__img-wrap { aspect-ratio: 3/2; }
.card--medium  .card__img-wrap { aspect-ratio: 16/9; }
.card--compact .card__img-wrap { aspect-ratio: 16/9; }

.card--feature .card__title {
  font-size: clamp(1.125rem, 1.6vw, 1.625rem);
}

/* ── Architectural Studio Grids ───────────────────────────── */
.arch-grid {
  display: grid;
  background: var(--color-slate-border);
  gap: var(--grid-gap);
}

/* Home: Featured (2fr + 1fr stacked) */
.arch-grid--featured {
  grid-template-columns: 2fr 1fr;
}

.arch-grid--featured .arch-grid__stack {
  display: grid;
  grid-template-rows: 1fr 1fr;
  background: var(--color-slate-border);
  gap: var(--grid-gap);
}

/* Home: Latest (3-col) */
.arch-grid--3col {
  grid-template-columns: repeat(3, 1fr);
}

/* Articles list: Studio Archive */
.arch-grid--archive {
  grid-template-columns: repeat(3, 1fr);
}

.arch-grid--archive .card:first-child {
  grid-column: span 2;
}

.arch-grid--archive .card:first-child .card__img-wrap {
  aspect-ratio: 21/9;
}

/* Related (3-col) */
.arch-grid--related {
  grid-template-columns: repeat(3, 1fr);
}

/* ── Newsletter ───────────────────────────────────────────── */
.newsletter {
  border-top: 1px solid var(--color-slate-border);
  border-bottom: 1px solid var(--color-slate-border);
  padding: var(--space-2xl) 0;
}

.newsletter__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.newsletter__eyebrow {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.newsletter__title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.newsletter__desc {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-slate);
  line-height: 1.7;
  max-width: 400px;
}

.newsletter__form {
  display: flex;
}

.newsletter__input {
  flex: 1;
  background: none;
  border: 1px solid var(--color-slate-border);
  border-right: none;
  padding: 14px var(--space-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-fg);
  outline: none;
  transition: border-color var(--ease-snap);
  min-width: 0;
}

.newsletter__input::placeholder { color: var(--color-slate); }
.newsletter__input:focus { border-color: var(--color-fg); }

.newsletter__btn {
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 14px var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--ease-snap), border-color var(--ease-snap);
}

.newsletter__btn:hover {
  background: var(--color-fg);
  border-color: var(--color-fg);
}

.newsletter__note {
  margin-top: 10px;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  color: var(--color-slate);
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  padding: var(--space-xl) 0 var(--space-lg);
}

.footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  border-bottom: 1px solid var(--color-slate-border);
  padding-bottom: var(--space-xl);
}

.footer__logo {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

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

.footer__desc {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--color-slate);
  line-height: 1.7;
  max-width: 280px;
}

.footer__col-label {
  font-family: var(--font-sans);
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-slate);
  margin-bottom: var(--space-md);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-slate-alpha);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__links a {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--color-slate);
  transition: color var(--ease-snap);
}

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

.footer__bottom {
  max-width: var(--container-max);
  margin: var(--space-md) auto 0;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__copy {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  color: var(--color-slate);
}

/* ── Archive Header ───────────────────────────────────────── */
.archive-head {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-slate-border);
}

.archive-head__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.archive-head__pre {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.archive-head__pre::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--color-accent);
}

.archive-head__title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 900;
  line-height: 0.93;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}

.archive-head__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-slate-border);
}

.archive-head__count {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-slate);
  letter-spacing: 0.04em;
}

.archive-filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-btn {
  background: none;
  border: 1px solid var(--color-slate-border);
  padding: 6px 14px;
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-slate);
  cursor: pointer;
  transition: all var(--ease-snap);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-fg);
  border-color: var(--color-fg);
  color: var(--color-bg);
}

/* ── The Blueprint Page ───────────────────────────────────── */
.bp-hero {
  min-height: 60vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--color-slate-border);
  overflow: hidden;
}

.bp-hero__content {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-2xl) var(--space-xl) var(--space-xl);
  gap: var(--space-md);
  border-right: 1px solid var(--color-slate-border);
}

.bp-hero__eyebrow {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.bp-hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--color-accent);
}

.bp-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.025em;
}

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

.bp-hero__desc {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-slate);
  line-height: 1.7;
  max-width: 440px;
}

.bp-hero__image {
  overflow: hidden;
  background: var(--color-slate-alpha);
}

.bp-hero__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-hover);
}

.bp-hero__image:hover img { transform: scale(1.02); }

.bp-manifesto {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-slate-border);
}

.bp-manifesto__inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.bp-manifesto blockquote {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.015em;
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-lg);
  margin: var(--space-xl) 0;
}

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

.bp-method__header {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  margin-bottom: var(--space-xl);
}

.bp-method__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--color-slate-border);
  gap: var(--grid-gap);
}

.bp-method__cell {
  background: var(--color-bg);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: background-color var(--ease-snap);
}

.bp-method__cell:hover { background: var(--color-slate-alpha); }

.bp-method__num {
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-slate-alpha);
  transition: color var(--ease-hover);
}

.bp-method__cell:hover .bp-method__num { color: var(--color-accent); }

.bp-method__name {
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.bp-method__title {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 1.5vw, 1.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.bp-method__desc {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-slate);
  line-height: 1.7;
}

.bp-values {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-slate-border);
  border-bottom: 1px solid var(--color-slate-border);
}

.bp-values__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.bp-values__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--color-slate-border);
  gap: var(--grid-gap);
  margin-top: var(--space-xl);
}

.bp-value__item {
  background: var(--color-bg);
  padding: var(--space-lg) var(--space-md);
}

.bp-value__label {
  font-family: var(--font-sans);
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.bp-value__title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.bp-value__text {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--color-slate);
  line-height: 1.65;
}

/* ── Article Page ─────────────────────────────────────────── */
.art-header {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-slate-border);
}

.art-header__inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.art-header__breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-lg);
}

.art-header__breadcrumb a,
.art-header__breadcrumb span {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  color: var(--color-slate);
  letter-spacing: 0.06em;
}

.art-header__breadcrumb a { transition: color var(--ease-snap); }
.art-header__breadcrumb a:hover { color: var(--color-accent); }

.art-header__sep {
  font-size: 0.625rem;
  color: var(--color-slate);
  opacity: 0.5;
}

.art-header__protocol {
  font-family: var(--font-sans);
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-slate);
  margin-bottom: 6px;
}

.art-header__category {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 4px 10px;
  margin-bottom: var(--space-md);
}

.art-header__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3.75rem);
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-sm);
}

.art-header__subtitle {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-slate);
  line-height: 1.65;
  max-width: 640px;
  margin-bottom: var(--space-lg);
}

.art-header__details {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-slate-alpha);
  flex-wrap: wrap;
}

.art-header__detail {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.art-header__detail strong {
  font-weight: 600;
  color: var(--color-fg);
}

.art-hero-img {
  width: 100%;
  height: clamp(280px, 50vw, 580px);
  overflow: hidden;
  background: var(--color-slate-alpha);
}

.art-hero-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Article body layout */
.art-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  gap: var(--space-xl);
  align-items: start;
}

.art-toc {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-lg));
  height: fit-content;
}

.art-toc__label {
  font-family: var(--font-sans);
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-slate);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-slate-border);
  margin-bottom: var(--space-sm);
}

.art-toc__list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.art-toc__list a {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  color: var(--color-slate);
  line-height: 1.5;
  padding: 5px 0 5px 10px;
  border-left: 2px solid transparent;
  transition: color var(--ease-snap), border-color var(--ease-snap);
}

.art-toc__list a:hover { color: var(--color-fg); border-left-color: var(--color-slate); }
.art-toc__list a.active { color: var(--color-accent); border-left-color: var(--color-accent); }

/* Article prose */
.art-body { max-width: 680px; }

.art-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2vw, 1.875rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-slate-alpha);
}

.art-body h2:first-child { margin-top: 0; }

.art-body h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.0625rem, 1.5vw, 1.3125rem);
  font-weight: 700;
  line-height: 1.2;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-xs);
}

.art-body h4 {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

.art-body p {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: var(--space-md);
  color: var(--color-fg);
}

.art-body .img-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-slate-alpha);
  border: 1px solid var(--color-slate-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--space-xl) 0;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  color: var(--color-slate);
  letter-spacing: 0.06em;
  text-align: center;
  padding: var(--space-md);
  line-height: 1.5;
}

/* Related section */
.related {
  border-top: 1px solid var(--color-slate-border);
  padding: var(--space-xl) 0 var(--space-2xl);
}

.related__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ── Utility Classes ──────────────────────────────────────── */
.u-accent { color: var(--color-accent); }
.u-slate  { color: var(--color-slate); }
.u-serif  { font-family: var(--font-serif); }

.pad-section {
  padding: var(--space-xl) 0;
}

/* ── Responsive Breakpoints ───────────────────────────────── */
@media (max-width: 1200px) {
  .bp-method__grid { grid-template-columns: repeat(2, 1fr); }
  .bp-values__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero__content { border-right: none; border-bottom: 1px solid var(--color-slate-border); padding: var(--space-xl) var(--space-lg); }
  .hero__image-wrap { aspect-ratio: 16/9; }

  .arch-grid--featured { grid-template-columns: 1fr; }
  .arch-grid--featured .arch-grid__stack { grid-template-rows: auto; grid-template-columns: 1fr 1fr; }

  .arch-grid--archive .card:first-child { grid-column: span 2; }

  .footer__inner { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
  .newsletter__inner { grid-template-columns: 1fr; gap: var(--space-lg); }

  .bp-hero { grid-template-columns: 1fr; }
  .bp-hero__content { border-right: none; border-bottom: 1px solid var(--color-slate-border); padding: var(--space-xl) var(--space-lg); }
  .bp-hero__image { aspect-ratio: 16/9; }

  .art-layout { grid-template-columns: 1fr; }
  .art-toc { display: none; }

  .stats-bar__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
  }

  .nav__inner { grid-template-columns: 1fr auto; padding: 0 var(--space-sm); }
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .container { padding: 0 var(--space-sm); }

  .hero__content { padding: var(--space-xl) var(--space-sm); }

  .arch-grid--3col { grid-template-columns: 1fr; }
  .arch-grid--archive { grid-template-columns: 1fr; }
  .arch-grid--archive .card:first-child { grid-column: span 1; }
  .arch-grid--archive .card:first-child .card__img-wrap { aspect-ratio: 16/9; }
  .arch-grid--related { grid-template-columns: 1fr; }
  .arch-grid--featured .arch-grid__stack { grid-template-columns: 1fr; }

  .stats-bar__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr; padding: 0 var(--space-sm); gap: var(--space-lg); }
  .footer__bottom { padding: 0 var(--space-sm); flex-direction: column; align-items: flex-start; gap: 6px; }
  .newsletter__inner { padding: 0 var(--space-sm); }

  .newsletter__form {
    flex-direction: column;
  }

  .newsletter__input {
    border-right: 1px solid var(--color-slate-border);
    border-bottom: none;
    width: 100%;
  }

  .newsletter__btn {
    width: 100%;
    text-align: center;
    padding: 14px var(--space-sm);
  }

  .bp-method__grid { grid-template-columns: 1fr; }
  .bp-values__grid { grid-template-columns: 1fr; }
  .bp-hero__content { padding: var(--space-xl) var(--space-sm); }

  .art-header__inner { padding: 0 var(--space-sm); }
  .art-layout { padding: var(--space-lg) var(--space-sm); }
  .related__inner { padding: 0 var(--space-sm); }
  .archive-head__inner { padding: 0 var(--space-sm); }
  .archive-head__meta { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }
}

@media (max-width: 480px) {
  .hero__headline { font-size: clamp(2.25rem, 12vw, 3.5rem); }
  .stats-bar__grid { grid-template-columns: repeat(2, 1fr); }
}