@font-face {
  font-family: "Instrument Sans";
  src: url("assets/fonts/InstrumentSans-Regular.ttf") format("truetype");
  font-display: swap;
}

@font-face {
  font-family: "Instrument Serif";
  src: url("assets/fonts/InstrumentSerif-Regular.ttf") format("truetype");
  font-display: swap;
}

:root {
  --paper: #f3ecdf;
  --paper-strong: #efe3d0;
  --ink: #1d1712;
  --ink-soft: #4a3d31;
  --ink-muted: #706154;
  --line: rgba(54, 38, 22, 0.15);
  --card: rgba(255, 248, 239, 0.86);
  --card-strong: rgba(255, 250, 244, 0.96);
  --accent: #8c3f2f;
  --accent-soft: rgba(140, 63, 47, 0.12);
  --sage: #66745f;
  --shadow: 0 30px 70px rgba(58, 38, 20, 0.12);
  --max-width: 1180px;
  --radius-xl: 2rem;
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  font-family: "Instrument Sans", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(140, 63, 47, 0.1), transparent 30%),
    radial-gradient(circle at 85% 16%, rgba(102, 116, 95, 0.12), transparent 24%),
    linear-gradient(180deg, #f8f1e5 0%, #f3ecdf 52%, #ece1d0 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(29, 23, 18, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 23, 18, 0.04) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 82%);
}

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

a {
  color: inherit;
}

button,
a,
summary {
  transition:
    transform 180ms ease,
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    opacity 180ms ease;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  z-index: 20;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: #fff;
  color: #000;
}

.skip-link:focus {
  top: 1rem;
}

.page-shell {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
  padding-bottom: 4rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 15;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
}

.topbar.is-scrolled {
  backdrop-filter: blur(18px);
}

.topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: rgba(248, 241, 229, 0.55);
  border: 1px solid transparent;
  opacity: 0;
  transition: opacity 180ms ease, border-color 180ms ease;
  z-index: -1;
}

.topbar.is-scrolled::before {
  opacity: 1;
  border-color: rgba(54, 38, 22, 0.08);
}

.brand {
  display: inline-flex;
  max-width: 13rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
}

.nav a {
  padding: 0.75rem 1rem;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid rgba(54, 38, 22, 0.1);
  background: rgba(255, 250, 244, 0.62);
  color: var(--ink-soft);
}

.nav a:hover,
.nav a:focus-visible {
  transform: translateY(-1px);
  color: var(--ink);
  border-color: rgba(140, 63, 47, 0.25);
}

.section {
  margin-top: 4.5rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(320px, 0.94fr);
  gap: 1.75rem;
  align-items: stretch;
  padding-top: 1.25rem;
}

.hero-copy,
.hero-visual,
.info-card,
.principle-card,
.outfit-card,
.trend-card,
.checklist-panel,
.faq-list details {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--card-strong), var(--card));
  box-shadow: var(--shadow);
}

.hero-copy,
.hero-visual {
  border-radius: var(--radius-xl);
}

.hero-copy {
  position: relative;
  overflow: hidden;
  padding: 2.6rem;
}

.hero-copy::after {
  content: "";
  position: absolute;
  right: -5rem;
  top: -5rem;
  width: 14rem;
  height: 14rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(140, 63, 47, 0.16), transparent 70%);
}

.eyebrow,
.stat-label,
.signal-index,
.principle-number,
.poster-kicker,
.poster-header,
.poster-footer,
.tag-row,
.checklist {
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.eyebrow,
.stat-label,
.signal-index,
.poster-kicker,
.poster-header,
.poster-footer,
.tag-row {
  font-size: 0.76rem;
  color: var(--accent);
}

h1,
h2,
h3,
summary {
  margin: 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-weight: 400;
}

h1 {
  max-width: 10ch;
  font-size: clamp(3.2rem, 8vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

h3 {
  font-size: 1.4rem;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.75;
}

.hero-dek {
  max-width: 60ch;
  margin-top: 1rem;
  font-size: 1.07rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1.6rem;
  padding: 1rem 1.4rem;
  border-radius: 999px;
  text-decoration: none;
}

.button-primary {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}

.button-primary:hover,
.button-primary:focus-visible {
  transform: translateY(-2px);
  background: #30261f;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.stat-card {
  position: relative;
  padding: 1.15rem 1.2rem 1.2rem;
  border-radius: var(--radius-md);
  background: rgba(255, 250, 244, 0.7);
  border: 1px solid rgba(54, 38, 22, 0.08);
}

.stat-card strong {
  display: block;
  margin-top: 0.3rem;
  margin-bottom: 0.45rem;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.1;
}

.hero-visual {
  padding: 1.3rem;
}

.poster-frame {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  gap: 1rem;
  border-radius: calc(var(--radius-xl) - 0.5rem);
  background:
    linear-gradient(135deg, rgba(255, 248, 239, 0.98), rgba(238, 227, 211, 0.95)),
    linear-gradient(180deg, rgba(140, 63, 47, 0.07), rgba(102, 116, 95, 0.08));
  border: 1px solid rgba(54, 38, 22, 0.1);
  padding: 1.25rem;
}

.poster-header,
.poster-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--ink-muted);
}

.poster-body {
  position: relative;
  flex: 1;
  min-height: 440px;
  border-radius: calc(var(--radius-xl) - 0.7rem);
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 251, 246, 0.95), rgba(246, 236, 220, 0.88)),
    radial-gradient(circle at 20% 15%, rgba(140, 63, 47, 0.08), transparent 28%);
}

.shape {
  position: absolute;
}

.shape-loop {
  top: 2.5rem;
  right: 2.25rem;
  width: 13rem;
  height: 13rem;
  border: 1.25rem solid rgba(140, 63, 47, 0.88);
  border-bottom-color: rgba(140, 63, 47, 0.16);
  border-left-color: rgba(140, 63, 47, 0.4);
  border-radius: 42% 58% 54% 46% / 50% 38% 62% 50%;
  transform: rotate(18deg);
}

.shape-panel {
  left: 2.2rem;
  bottom: 2rem;
  width: 15rem;
  height: 11rem;
  background:
    linear-gradient(180deg, rgba(29, 23, 18, 0.06), rgba(29, 23, 18, 0.01)),
    linear-gradient(135deg, rgba(102, 116, 95, 0.92), rgba(76, 86, 71, 0.92));
  border-radius: 1.75rem 4rem 1.2rem 1.75rem;
}

.shape-dot {
  left: 3rem;
  top: 3rem;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: rgba(140, 63, 47, 0.88);
}

.shape-line {
  right: 5rem;
  bottom: 5rem;
  width: 11rem;
  height: 0.12rem;
  background: rgba(29, 23, 18, 0.58);
  transform: rotate(-18deg);
}

.poster-copy {
  position: absolute;
  left: 2.2rem;
  right: 2.2rem;
  top: 8.2rem;
  display: grid;
  gap: 0.8rem;
}

.poster-title {
  max-width: 9ch;
  color: var(--ink);
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(2.7rem, 6vw, 4.7rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
}

.poster-note {
  max-width: 28ch;
}

.section-heading {
  display: grid;
  gap: 0.8rem;
  margin-bottom: 1.6rem;
}

.section-heading.narrow {
  max-width: 48rem;
}

.overview-grid,
.principles-grid,
.outfit-grid,
.trend-grid {
  display: grid;
  gap: 1.2rem;
}

.overview-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.principles-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.outfit-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.trend-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.principle-card,
.outfit-card,
.trend-card {
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.info-card p,
.principle-card p,
.outfit-card p,
.trend-card p {
  margin-top: 0.7rem;
}

.principle-number {
  display: inline-block;
  margin-bottom: 0.8rem;
  color: var(--sage);
  font-size: 0.8rem;
}

.tag-row {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  color: var(--sage);
}

.outfit-card ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.trend-card {
  position: relative;
  overflow: hidden;
}

.trend-card::after {
  content: "";
  position: absolute;
  right: -2rem;
  top: -2rem;
  width: 6rem;
  height: 6rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(140, 63, 47, 0.16), transparent 70%);
}

.checklist-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 1.5rem;
  border-radius: var(--radius-xl);
  padding: 1.8rem;
}

.checklist {
  margin: 0;
  padding-left: 1.3rem;
  color: var(--ink);
  line-height: 1.8;
}

.checklist li + li {
  margin-top: 0.6rem;
}

.faq-list {
  display: grid;
  gap: 0.85rem;
}

.faq-list details {
  border-radius: var(--radius-lg);
  padding: 1.2rem 1.3rem;
}

.faq-list summary {
  list-style: none;
  cursor: pointer;
  padding-right: 2rem;
  position: relative;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  color: var(--accent);
  font-size: 1.6rem;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  margin-top: 0.9rem;
}

.footer {
  margin-top: 4rem;
  padding: 2rem 0 0;
  border-top: 1px solid rgba(54, 38, 22, 0.08);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
}

[data-reveal].is-visible {
  animation: rise-in 680ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1100px) {
  .hero,
  .checklist-panel,
  .overview-grid,
  .principles-grid,
  .outfit-grid,
  .trend-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    align-items: start;
  }

  .principles-grid,
  .outfit-grid,
  .trend-grid {
    grid-auto-rows: 1fr;
  }
}

@media (max-width: 780px) {
  .page-shell {
    width: min(var(--max-width), calc(100% - 1rem));
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 0.9rem;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero,
  .overview-grid,
  .principles-grid,
  .outfit-grid,
  .trend-grid,
  .checklist-panel,
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .hero-visual,
  .checklist-panel {
    padding: 1.3rem;
  }

  .poster-body {
    min-height: 360px;
  }

  .poster-copy {
    left: 1.3rem;
    right: 1.3rem;
    top: 7rem;
  }

  .shape-loop {
    right: 1.2rem;
    width: 10rem;
    height: 10rem;
    border-width: 1rem;
  }

  .shape-panel {
    left: 1.2rem;
    width: 11rem;
    height: 8rem;
  }

  .section {
    margin-top: 3.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}