/* =========================================================
   THE NAT — NYC WEEK · CLIMATE WEEK NYC 2026
   Brand fusion: THE NAT (deep green/black, ABC Diatype)
   + Ember accent language from THE NAT's nature-tech venture work
   ========================================================= */

@font-face {
  font-family: 'ABC Diatype Extended';
  src: url('./assets/fonts/ABCDiatypeExtended-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'ABC Diatype Extended';
  src: url('./assets/fonts/ABCDiatypeExtended-BoldItalic.woff2') format('woff2');
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'ABC Diatype Extended';
  src: url('./assets/fonts/ABCDiatypeExtended-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'ABC Diatype';
  src: url('./assets/fonts/ABCDiatype-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'ABC Diatype';
  src: url('./assets/fonts/ABCDiatype-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'ABC Diatype';
  src: url('./assets/fonts/ABCDiatype-RegularItalic.woff2') format('woff2');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'ABC Diatype';
  src: url('./assets/fonts/ABCDiatype-Light.woff2') format('woff2');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

/* =========================================================
   Design tokens
   ========================================================= */
:root {
  /* THE NAT core palette */
  --color-black: #000000;
  --color-deep: #032426;
  --color-deep-2: #053436;
  --color-deep-3: #0a4548;
  --color-mint: #c2fcc4;
  --color-ink: #f4f7f2;
  --color-ink-muted: #aab8b3;
  --color-ink-faint: #6f8280;

  /* Ember accent — bridges THE NAT's Capital + Technology + Action */
  --color-ember: #ef7b34;
  --color-ember-hover: #ff9152;
  --color-gold: #e7b25b;

  /* Semantic surfaces */
  --color-bg: var(--color-black);
  --color-surface: var(--color-deep);
  --color-surface-2: var(--color-deep-2);
  --color-border: color-mix(in oklab, var(--color-mint) 14%, transparent);
  --color-border-strong: color-mix(in oklab, var(--color-mint) 26%, transparent);

  /* Fonts */
  --font-display: 'ABC Diatype Extended', 'Archivo Expanded', sans-serif;
  --font-body: 'ABC Diatype', 'Archivo', sans-serif;

  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 0.5rem + 7vw, 7.25rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --transition-interactive: 180ms var(--ease-out);

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1.25rem;

  /* Content widths */
  --content-default: 1200px;
  --content-narrow: 720px;

  color-scheme: dark;
}

/* =========================================================
   Layout primitives
   ========================================================= */
.wrap {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}
.wrap--narrow {
  max-width: var(--content-narrow);
}

section {
  position: relative;
}

.section-pad {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ember);
  font-weight: 700;
}
.eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-ember);
  flex-shrink: 0;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-ink);
}

p {
  color: var(--color-ink-muted);
}

/* =========================================================
   Header / nav
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) clamp(1.25rem, 5vw, 3rem);
  background: color-mix(in oklab, var(--color-black) 78%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--transition-interactive),
    transform 300ms var(--ease-out);
}
.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
}
.site-header.is-hidden {
  transform: translateY(-100%);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.brand img {
  height: 22px;
  width: auto;
}
.brand-mark {
  height: 30px;
  width: auto;
}
.brand-divider {
  width: 1px;
  height: 18px;
  background: var(--color-border-strong);
}
.brand-tag {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.main-nav a {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  text-decoration: none;
  position: relative;
}
.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--color-ink);
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 1px;
  background: var(--color-ember);
  transition: width var(--transition-interactive);
}
.main-nav a:hover::after {
  width: 100%;
}

.nav-links {
  display: none;
}
@media (min-width: 860px) {
  .nav-links {
    display: flex;
  }
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-black);
  background: var(--color-mint);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full, 999px);
  text-decoration: none;
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--color-ink);
  transform: translateY(-1px);
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 60%;
}
.hero-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--color-black) 55%, transparent) 0%, color-mix(in oklab, var(--color-black) 35%, transparent) 45%, var(--color-black) 96%),
    linear-gradient(90deg, color-mix(in oklab, var(--color-black) 30%, transparent) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
}

.hero-eyebrow {
  color: var(--color-mint);
  border-color: var(--color-mint);
}
.hero-eyebrow::before {
  background: var(--color-mint);
}

.hero h1 {
  font-size: var(--text-hero);
  letter-spacing: -0.01em;
  margin-top: var(--space-6);
  max-width: 16ch;
}

.hero-equation {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  max-width: 46rem;
}
.hero-equation .term {
  color: var(--color-ink);
}
.hero-equation .op {
  color: var(--color-ink-faint);
  font-weight: 400;
}
.hero-equation .eq-result {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  white-space: nowrap;
}
.hero-equation .result {
  color: var(--color-ember);
}

.hero-meta {
  margin-top: var(--space-10);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  max-width: 40rem;
}
.hero-meta-item .label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}
.hero-meta-item .value {
  margin-top: var(--space-1);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-ink);
}

.scroll-cue {
  position: absolute;
  right: clamp(1.25rem, 5vw, 3rem);
  bottom: var(--space-8);
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-ink-faint);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.scroll-cue svg {
  animation: bob 1.8s var(--ease-in-out, ease-in-out) infinite;
}
@keyframes bob {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(6px);
  }
}

/* =========================================================
   Reveal utility (scroll-driven, no CLS)
   ========================================================= */
.reveal {
  opacity: 1;
}
@supports (animation-timeline: view()) {
  .reveal {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 55%;
  }
}
@keyframes reveal-fade {
  to {
    opacity: 1;
  }
}

/* =========================================================
   Mission / intro
   ========================================================= */
.mission {
  border-top: 1px solid var(--color-border);
}
.mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}
@media (min-width: 860px) {
  .mission-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--space-20);
  }
}
.mission h2 {
  font-size: var(--text-2xl);
  max-width: 14ch;
}
.mission-body p + p {
  margin-top: var(--space-5);
}
.mission-body p {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink);
}
.mission-body .muted {
  color: var(--color-ink-muted);
  font-size: var(--text-base);
}

/* Questions */
.questions {
  margin-top: var(--space-16);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 700px) {
  .questions {
    grid-template-columns: 1fr 1fr;
  }
}
.question-card {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--color-surface), color-mix(in oklab, var(--color-surface) 60%, var(--color-black)));
  position: relative;
  overflow: hidden;
}
.question-card::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, color-mix(in oklab, var(--color-ember) 22%, transparent), transparent 70%);
  pointer-events: none;
}
.question-card .num {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-ember);
  letter-spacing: 0.08em;
}
.question-card p {
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1.3;
}

/* =========================================================
   Programme / timeline
   ========================================================= */
.programme {
  border-top: 1px solid var(--color-border);
}
.programme-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-16);
}
.programme-head h2 {
  font-size: var(--text-2xl);
}

.day-block {
  margin-top: var(--space-20);
}
.day-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-5);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-strong);
  margin-bottom: var(--space-10);
}
.day-head .day-num-wrap {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
}
.day-head .day-tag {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}
.day-head .day-num {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-mint);
  line-height: 1;
}
.day-head .day-label {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-ink);
}
.day-head .day-date {
  margin-left: auto;
  font-size: var(--text-sm);
  color: var(--color-ink-faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.event-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.event-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: color-mix(in oklab, var(--color-surface) 55%, var(--color-black));
  transition: border-color var(--transition-interactive), transform var(--transition-interactive);
}
@media (min-width: 780px) {
  .event-card {
    grid-template-columns: 1.4fr 1fr;
  }
}
.event-card:hover {
  border-color: var(--color-border-strong);
}

.event-card--flagship {
  border-color: color-mix(in oklab, var(--color-gold) 45%, transparent);
  background: linear-gradient(135deg, color-mix(in oklab, var(--color-gold) 10%, var(--color-surface)) 0%, color-mix(in oklab, var(--color-black) 82%, transparent) 100%);
}
.event-card--flagship:hover {
  border-color: var(--color-gold);
}
.event-kind.event-kind--flagship {
  color: var(--color-gold);
}

.event-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.event-meta-row .event-kind {
  margin-bottom: 0;
}

.event-kind {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--color-ember);
  margin-bottom: var(--space-3);
}

.event-time {
  display: inline-flex;
  align-items: center;
  padding: 0.2em 0.7em;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  font-weight: 500;
  color: var(--color-ink-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full, 999px);
}
.event-card h3 {
  font-size: var(--text-lg);
  color: var(--color-ink);
  margin-bottom: var(--space-3);
}
.event-card > .event-main > p {
  font-size: var(--text-base);
  color: var(--color-ink-muted);
}

.event-topics {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.event-topics li {
  font-size: var(--text-xs);
  color: var(--color-ink);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full, 999px);
  padding: var(--space-1) var(--space-3);
}

.event-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
}
@media (min-width: 780px) {
  .event-side {
    border-top: none;
    border-left: 1px solid var(--color-border);
    padding-top: 0;
    padding-left: var(--space-8);
  }
}
.event-side .field .label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-1);
}
.event-side .field .val {
  font-size: var(--text-sm);
  color: var(--color-mint);
  line-height: 1.5;
}

.event-rsvp {
  grid-column: 1 / -1;
  margin-top: var(--space-2);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.event-invite-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.event-invite-link:hover {
  color: var(--color-ember);
}
.event-invite-link svg {
  transition: transform var(--transition-interactive);
}
.event-invite-link:hover svg {
  transform: translateX(2px);
}
.event-rsvp-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full, 999px);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink);
  text-decoration: none;
  transition: border-color var(--transition-interactive), color var(--transition-interactive), transform var(--transition-interactive);
}
.event-rsvp-link:hover {
  border-color: var(--color-ember);
  color: var(--color-ember);
  transform: translateY(-1px);
}
.event-rsvp-link svg {
  transition: transform var(--transition-interactive);
}
.event-rsvp-link:hover svg {
  transform: translateX(2px);
}
.event-rsvp-link--disabled {
  color: var(--color-ink-faint);
  border-color: var(--color-border);
  cursor: default;
  pointer-events: none;
}

/* =========================================================
   Glance / summary
   ========================================================= */
.glance {
  border-top: 1px solid var(--color-border);
  position: relative;
}
.glance-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.glance-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.glance-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--color-black) 0%, color-mix(in oklab, var(--color-black) 82%, transparent) 40%, var(--color-black) 100%);
}
.glance-content {
  position: relative;
  z-index: 1;
  text-align: center;
}
.glance-content p.lede {
  margin: var(--space-6) auto 0;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-ink);
  max-width: 42ch;
  line-height: 1.35;
}
.glance-content p.sub {
  margin: var(--space-6) auto 0;
  max-width: 56ch;
  font-size: var(--text-base);
}
.glance .eyebrow {
  justify-content: center;
}

/* =========================================================
   Contact / CTA
   ========================================================= */
.contact {
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.contact h2 {
  font-size: var(--text-2xl);
  max-width: 20ch;
  margin-inline: auto;
}
.contact p {
  margin: var(--space-5) auto 0;
  max-width: 50ch;
  font-size: var(--text-lg);
}
.contact-cta {
  margin-top: var(--space-10);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  background: var(--color-ember);
  color: var(--color-black);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  border-radius: var(--radius-full, 999px);
  text-decoration: none;
}
.contact-cta:hover {
  background: var(--color-ember-hover);
  transform: translateY(-2px);
}
.contact-cta svg {
  transition: transform var(--transition-interactive);
}
.contact-cta:hover svg {
  transform: translateX(3px);
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
}
.footer-support {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-bottom: var(--space-8);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}
.footer-support-label {
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}
.footer-support-logo {
  height: 40px;
  width: auto;
  opacity: 0.95;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.footer-row img {
  height: 20px;
}
.footer-links {
  display: flex;
  gap: var(--space-6);
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-ink-faint);
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--color-ink);
}
.footer-meta {
  font-size: var(--text-xs);
  color: var(--color-ink-faint);
}

/* =========================================================
   Buttons: hover/active baseline
   ========================================================= */
a,
button {
  cursor: pointer;
}