:root {
  color-scheme: light;
  --font-body: "Avenir Next", "Helvetica Neue", Helvetica, sans-serif;
  --font-display: "Avenir Next Demi Bold", "Avenir Next", "Helvetica Neue", Helvetica, sans-serif;
  --bg: #fcfcf8;
  --wash: rgba(0, 0, 0, 0.035);
  --panel: rgba(255, 255, 255, 0.84);
  --ink: #080808;
  --ink-muted: rgba(8, 8, 8, 0.68);
  --line: rgba(8, 8, 8, 0.16);
  --line-strong: rgba(8, 8, 8, 0.86);
  --field: rgba(255, 255, 255, 0.88);
  --button-bg: #080808;
  --button-text: #fcfcf8;
  --logo-opacity: 0.52;
  --wordmark-filter: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #050505;
    --wash: rgba(255, 255, 255, 0.08);
    --panel: rgba(12, 12, 12, 0.9);
    --ink: #f6f6f2;
    --ink-muted: rgba(246, 246, 242, 0.72);
    --line: rgba(246, 246, 242, 0.18);
    --line-strong: rgba(246, 246, 242, 0.76);
    --field: rgba(18, 18, 18, 0.96);
    --button-bg: #f6f6f2;
    --button-text: #050505;
    --logo-opacity: 0.4;
    --wordmark-filter: invert(1) brightness(1.05);
  }
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #fcfcf8;
  --wash: rgba(0, 0, 0, 0.035);
  --panel: rgba(255, 255, 255, 0.84);
  --ink: #080808;
  --ink-muted: rgba(8, 8, 8, 0.68);
  --line: rgba(8, 8, 8, 0.16);
  --line-strong: rgba(8, 8, 8, 0.86);
  --field: rgba(255, 255, 255, 0.88);
  --button-bg: #080808;
  --button-text: #fcfcf8;
  --logo-opacity: 0.52;
  --wordmark-filter: none;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #050505;
  --wash: rgba(255, 255, 255, 0.08);
  --panel: rgba(12, 12, 12, 0.9);
  --ink: #f6f6f2;
  --ink-muted: rgba(246, 246, 242, 0.72);
  --line: rgba(246, 246, 242, 0.18);
  --line-strong: rgba(246, 246, 242, 0.76);
  --field: rgba(18, 18, 18, 0.96);
  --button-bg: #f6f6f2;
  --button-text: #050505;
  --logo-opacity: 0.4;
  --wordmark-filter: invert(1) brightness(1.05);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top center, var(--wash), transparent 42%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  transition:
    background-color 0.25s ease,
    color 0.25s ease;
}

a,
button,
input,
textarea {
  font: inherit;
}

a {
  color: inherit;
}

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

[hidden] {
  display: none !important;
}

.page {
  width: min(100%, 60rem);
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem) clamp(1rem, 4vw, 2.25rem) clamp(3rem, 7vw, 5rem);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  width: clamp(9.25rem, 23vw, 12.75rem);
  flex: 0 1 auto;
  text-decoration: none;
}

.wordmark__image {
  display: block;
  width: 100%;
  height: auto;
  filter: var(--wordmark-filter);
  transition: filter 0.25s ease;
}

.theme-toggle {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 0;
  border-radius: 50%;
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    background-color 0.2s ease,
    transform 0.2s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

.theme-toggle__icon {
  position: absolute;
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  opacity: 0;
  transform: scale(0.7) rotate(-18deg);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

html[data-theme="light"] .theme-toggle__icon--sun,
html[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.stack {
  display: grid;
  gap: clamp(1.15rem, 2.4vw, 1.8rem);
}

.site-logo {
  width: min(100%, 325px);
  margin: clamp(0.25rem, 1.8vw, 1rem) auto clamp(0.3rem, 1.4vw, 0.7rem);
  opacity: var(--logo-opacity);
  pointer-events: none;
}

.site-logo--small {
  width: min(100%, 325px);
}

.site-logo__image {
  display: block;
  width: 100%;
  height: auto;
}

.site-logo__image--dark {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-logo__image--light {
    display: none;
  }

  :root:not([data-theme="light"]) .site-logo__image--dark {
    display: block;
  }
}

html[data-theme="dark"] .site-logo__image--light {
  display: none;
}

html[data-theme="dark"] .site-logo__image--dark {
  display: block;
}

html[data-theme="light"] .site-logo__image--light {
  display: block;
}

html[data-theme="light"] .site-logo__image--dark {
  display: none;
}

.panel {
  width: min(100%, 56rem);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 1.35rem;
  background: var(--panel);
  padding: clamp(1.15rem, 3vw, 1.7rem);
  transition:
    border-color 0.25s ease,
    background-color 0.25s ease;
}

.copy-panel,
.form-panel {
  text-align: center;
}

.copy-panel {
  width: min(100%, 42rem);
}

.copy-panel p {
  margin: 0 auto;
  max-width: 32rem;
  font-size: clamp(1rem, 2vw, 1.12rem);
  color: var(--ink-muted);
}

.form-panel h2,
.thanks-panel h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
}

.form-panel {
  width: min(100%, 42rem);
}

.form-panel h2,
.thanks-panel h1 {
  font-size: clamp(2rem, 5vw, 2.6rem);
}

.contact-intro,
.thanks-panel p {
  margin: 0.6rem auto 0;
  max-width: 32rem;
  color: var(--ink-muted);
}

.mailto,
.inline-link {
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

form {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
  text-align: left;
}

label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.95rem;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  background: var(--field);
  color: var(--ink);
  padding: 0.92rem 1rem;
  transition:
    border-color 0.2s ease,
    background-color 0.2s ease,
    box-shadow 0.2s ease;
}

textarea {
  min-height: 10rem;
  resize: vertical;
}

input::placeholder,
textarea::placeholder {
  color: var(--ink-muted);
}

.submit-button,
.link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-width: 11rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--button-text);
  padding: 0.9rem 1.2rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease,
    background-color 0.25s ease,
    color 0.25s ease;
}

.submit-button:hover,
.link-button:hover {
  transform: translateY(-1px);
}

.thanks-panel {
  width: min(100%, 32rem);
  text-align: center;
}

.thanks-panel p + .link-button {
  margin-top: 1.5rem;
}

:focus-visible {
  outline: 2px solid var(--line-strong);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

::selection {
  background: var(--line-strong);
  color: var(--bg);
}

@media (max-width: 42rem) {
  .page {
    padding-inline: 1rem;
  }

  .topbar {
    margin-bottom: 1rem;
  }

  .panel {
    border-radius: 1.15rem;
  }

  .theme-toggle {
    width: 2.8rem;
    height: 2.8rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}