:root {
  /* Storm-night palette — cinematic-tech / dark-mode premium */
  --color-bg: #0b1117;
  --color-surface: #121a22;
  --color-surface-2: #16202a;
  --color-divider: rgba(138, 154, 171, 0.14);
  --color-border: rgba(138, 154, 171, 0.28);
  --color-text: #edf2f7;
  --color-text-muted: #8a9aab;
  --color-text-faint: #5a6b7d;
  --color-accent: #2dd4bf;
  --color-accent-deep: #14b8a6;
  --color-accent-dim: rgba(45, 212, 191, 0.14);

  --font-display: 'Clash Display', 'Satoshi', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  --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-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

  --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;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-default: 1080px;
}

/* ---------- marquee ---------- */
.marquee {
  overflow: hidden;
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-accent);
  color: #06231f;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.marquee__track {
  display: inline-flex;
  padding-block: var(--space-3);
  animation: marquee-scroll 28s linear infinite;
}

.marquee__track span {
  padding-inline: var(--space-8);
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: rgba(11, 17, 23, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.site-header__nav {
  display: none;
  gap: var(--space-8);
  align-items: center;
}

.site-header__nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
}

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

.brandmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

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

.brandmark--endorsed {
  display: grid;
  gap: 0.2rem;
  flex-shrink: 0;
  line-height: 1.1;
}

.brandmark__byline {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.025em;
  color: var(--color-text-muted);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-sm);
  text-decoration: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #06231f;
  border: 1px solid var(--color-accent);
}

.btn--primary:hover {
  background: #5ce4d2;
}

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

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

.btn .arrow {
  transition: transform var(--transition-interactive);
}

.btn:hover .arrow {
  transform: translateX(3px);
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  isolation: isolate;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
}

.hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(to bottom, rgba(11, 17, 23, 0.82) 0%, rgba(11, 17, 23, 0.25) 38%, rgba(11, 17, 23, 0.62) 72%, rgba(11, 17, 23, 0.95) 100%),
    radial-gradient(120% 90% at 50% 0%, rgba(11, 17, 23, 0.55) 0%, rgba(11, 17, 23, 0) 60%);
}

.hero__inner {
  width: min(var(--content-default), 100%);
  margin-inline: auto;
  padding: var(--space-24) var(--space-6) var(--space-16);
}

.hero__wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-hero);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

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

.hero__tagline {
  margin-top: var(--space-5);
  max-width: 34ch;
  font-size: var(--text-lg);
  line-height: 1.45;
  color: var(--color-text);
  text-wrap: balance;
}

.hero__tagline strong {
  color: var(--color-accent);
  font-weight: 600;
}

.hero__form {
  margin-top: var(--space-8);
  display: flex;
  gap: var(--space-3);
  max-width: 30rem;
}

.waitlist-form input {
  flex: 1;
  min-width: 0;
  padding: var(--space-3) var(--space-4);
  background: rgba(11, 17, 23, 0.65);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: var(--text-base);
}

.waitlist-form input::placeholder {
  color: var(--color-text-faint);
}

.waitlist-form input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.hero__meta {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.hero__meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.hero__meta svg {
  width: 14px;
  height: 14px;
  color: var(--color-accent);
  flex: none;
}

.hero__scrollcue {
  position: absolute;
  left: 50%;
  bottom: var(--space-5);
  transform: translateX(-50%);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.hero__scrollcue svg {
  width: 16px;
  height: 16px;
  animation: cue-bob 2.2s ease-in-out infinite;
}

@keyframes cue-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(5px); }
}

/* ---------- sections ---------- */
.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.section__inner {
  width: min(var(--content-default), 100%);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.eyebrow {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.eyebrow::before {
  content: '[';
  color: var(--color-text-faint);
}

.eyebrow::after {
  content: ']';
  color: var(--color-text-faint);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-2xl);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin-top: var(--space-4);
  text-wrap: balance;
}

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

.section__lede {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  max-width: 52ch;
  font-size: var(--text-lg);
}

/* ---------- planned mountain conditions ---------- */
.conditions {
  margin-top: var(--space-16);
  padding-top: var(--space-10);
  border-top: 1px solid var(--color-border);
}

.conditions__title {
  margin-top: var(--space-4);
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 600;
  line-height: 1.12;
  text-wrap: balance;
}

.conditions__intro,
.conditions__details p {
  margin-top: var(--space-4);
  max-width: 64ch;
  color: var(--color-text-muted);
}

.conditions__formula {
  margin-top: var(--space-8);
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--color-surface);
  border: 1px solid var(--color-accent);
  border-radius: 12px;
}

.conditions__inputs {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.75rem;
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 500;
}

.conditions__operator {
  color: var(--color-accent);
}

.conditions__result {
  margin-top: var(--space-4);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.25rem);
  font-weight: 600;
  line-height: 1.2;
  text-wrap: balance;
}

.conditions__details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.conditions__details strong {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.conditions__note {
  margin-top: var(--space-6);
  max-width: 85ch;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ---------- how it works ---------- */
.how {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

.how__figure {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-divider);
}

.how__figure img {
  width: 100%;
  height: auto;
}

.how__figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-8) var(--space-4) var(--space-3);
  font-size: var(--text-xs);
  color: rgba(237, 242, 247, 0.85);
  background: linear-gradient(to top, rgba(11, 17, 23, 0.85), transparent);
}

.steps {
  display: grid;
  gap: var(--space-8);
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
}

.step__index {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-lg);
  color: var(--color-accent);
  padding-top: 2px;
}

.step__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: 0.01em;
}

.step__body {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

/* ---------- stat card (signature) ---------- */
.statcard {
  margin-top: var(--space-12);
  display: grid;
  gap: var(--space-10);
  align-items: center;
}

.statcard__device {
  position: relative;
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.statcard__route {
  width: 100%;
  height: auto;
  color: var(--color-accent);
}

.statcard__route path {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
}

.statcard__device.is-live .statcard__route path {
  transition: stroke-dashoffset 2.4s cubic-bezier(0.4, 0, 0.2, 1);
  stroke-dashoffset: 0;
}

.statcard__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.statcard__mountain {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.statcard__date {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.statcard__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}

.stat__value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xl);
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.stat__value .unit {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-left: var(--space-1);
}

.stat__label {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.statcard__challenge {
  margin-top: var(--space-6);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-full);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 700;
  background: var(--color-accent-dim);
}

/* ---------- manifesto band ---------- */
.band {
  position: relative;
  isolation: isolate;
  padding-block: clamp(var(--space-20), 10vw, var(--space-24));
  color: var(--color-text);
}

.band__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.band__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.band__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(to right, rgba(11, 17, 23, 0.94) 0%, rgba(11, 17, 23, 0.72) 55%, rgba(11, 17, 23, 0.45) 100%),
    linear-gradient(to bottom, rgba(11, 17, 23, 0.5), rgba(11, 17, 23, 0.9));
}

.band__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-2xl);
  line-height: 1.08;
  max-width: 20ch;
  text-wrap: balance;
}

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

.band__body {
  margin-top: var(--space-5);
  max-width: 46ch;
  color: rgba(237, 242, 247, 0.82);
  font-size: var(--text-lg);
}

/* ---------- FAQ ---------- */
.faq {
  margin-top: var(--space-10);
  display: grid;
  gap: var(--space-3);
  max-width: 46rem;
}

.faq__item {
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
}

.faq__item details {
  border-radius: inherit;
}

.faq__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-base);
  list-style: none;
}

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

.faq__item summary svg {
  width: 16px;
  height: 16px;
  flex: none;
  color: var(--color-accent);
  transition: transform var(--transition-interactive);
}

.faq__item details[open] summary svg {
  transform: rotate(45deg);
}

.faq__item details[open] summary {
  color: var(--color-accent);
}

.faq__answer {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--color-text-muted);
}

.faq__answer p {
  max-width: none;
}

.faq__item details::details-content {
  transition: opacity 220ms ease, block-size 220ms ease;
  block-size: 0;
  opacity: 0;
}

.faq__item details[open]::details-content {
  block-size: auto;
  opacity: 1;
}

/* ---------- final waitlist ---------- */
.final {
  text-align: center;
}

.final .section__title {
  margin-inline: auto;
  max-width: 18ch;
}

.final .section__lede {
  margin-inline: auto;
}

.final__form {
  margin: var(--space-8) auto 0;
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  max-width: 30rem;
  margin-inline: auto;
}

.final__note {
  margin-top: var(--space-4);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

/* ---------- form success ---------- */
.form-success {
  display: none;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-accent-dim);
  color: var(--color-text);
  font-weight: 600;
}

.form-success.is-shown {
  display: inline-flex;
}

.form-success svg {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
  flex: none;
}

.form-error {
  display: none;
  margin-top: var(--space-2);
  color: #f87171;
  font-size: var(--text-sm);
}

.form-error.is-shown {
  display: block;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: #080d12;
  padding-block: var(--space-10);
}

.site-footer__inner {
  width: min(var(--content-default), 100%);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-footer__meta {
  color: var(--color-text-faint);
  font-size: var(--text-sm);
  display: grid;
  gap: var(--space-1);
}

.site-footer__meta a {
  color: var(--color-text-muted);
}

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal:nth-child(2) { transition-delay: 90ms; }
.reveal:nth-child(3) { transition-delay: 180ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- responsive ---------- */
@media (min-width: 720px) {
  .site-header__nav {
    display: flex;
  }

  .how {
    grid-template-columns: 5fr 6fr;
    gap: var(--space-16);
  }

  .statcard {
    grid-template-columns: 6fr 5fr;
    gap: var(--space-16);
  }

  .band .section__inner {
    max-width: min(var(--content-default), 100%);
  }
}

@media (max-width: 559px) {
  .hero__form,
  .final__form {
    flex-direction: column;
  }

  .statcard__stats {
    grid-template-columns: 1fr;
  }
}