:root {
  color-scheme: light;
  font-family: Inter, "Noto Sans JP", "Yu Gothic UI", system-ui, sans-serif;
  color: #1c211f;
  background: #f4f1ea;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --ink: #1c211f;
  --muted: #646c68;
  --paper: #fffefa;
  --line: rgb(28 33 31 / 13%);
  --accent: #e95c3c;
  --accent-dark: #b53523;
  --mint: #d7f5e8;
  --focus: #176fd1;
  --radius: 1.25rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 85% 4%, rgb(238 96 61 / 14%), transparent 26rem),
    radial-gradient(circle at 6% 28%, rgb(71 187 146 / 12%), transparent 25rem),
    linear-gradient(180deg, #fbfaf6, #f2efe7);
}

button,
input,
textarea {
  font: inherit;
}

button,
input,
textarea,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 20;
  padding: 0.75rem 1rem;
  color: white;
  background: var(--ink);
  transform: translateY(-110%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
footer,
main {
  width: min(74rem, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header,
footer,
.site-header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header {
  min-height: 4.5rem;
  border-bottom: 1px solid var(--line);
}

.site-header nav {
  gap: 1rem;
}

.site-header nav > a {
  font-size: 0.9rem;
  font-weight: 750;
  text-decoration: none;
}

.brand {
  font-weight: 850;
  text-decoration: none;
  letter-spacing: -0.035em;
}

.eyebrow,
.kind {
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.nav-cta {
  min-height: 2.5rem;
  padding: 0.2rem 0.85rem;
  color: #fff;
  background: var(--ink);
  border-radius: 0.65rem;
}

.hero {
  display: grid;
  min-height: min(42rem, calc(100vh - 4.5rem));
  padding-block: clamp(3rem, 8vw, 6rem);
  grid-template-columns: minmax(0, 0.9fr) minmax(25rem, 1.1fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent-dark);
}

h1,
h2,
p {
  max-width: 48rem;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.12;
  letter-spacing: -0.045em;
}

h1 {
  max-width: 42rem;
  margin-bottom: 0;
  font-size: clamp(2.25rem, 4.5vw, 4.5rem);
}

h2 {
  font-size: clamp(1.4rem, 2.5vw, 2.4rem);
}

.lead {
  margin-block: 1.75rem 0;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.85;
  color: #4c5752;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.inbox-preview {
  position: relative;
  min-height: 31rem;
  padding: clamp(1rem, 3vw, 2rem);
  background:
    radial-gradient(circle at 80% 20%, rgb(233 92 60 / 16%), transparent 12rem),
    linear-gradient(145deg, rgb(255 255 255 / 88%), rgb(215 245 232 / 80%));
  border: 1px solid rgb(28 33 31 / 9%);
  border-radius: 2rem;
  box-shadow: 0 2.5rem 6rem rgb(54 43 23 / 13%);
}

.profile-chip,
.send-chip,
.preview-title {
  display: flex;
  align-items: center;
}

.profile-chip {
  position: absolute;
  z-index: 2;
  top: 1rem;
  left: 0.5rem;
  padding: 0.65rem 0.8rem;
  gap: 0.65rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  box-shadow: 0 1rem 2.5rem rgb(54 43 23 / 14%);
  transform: rotate(-2deg);
}

.profile-avatar {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  color: #fff;
  background: var(--accent);
  border-radius: 50%;
  font-weight: 850;
}

.profile-chip > span:last-child {
  display: grid;
  gap: 0.1rem;
  font-size: 0.75rem;
}

.profile-chip small {
  color: var(--muted);
}

.preview-inbox {
  position: absolute;
  inset: 2.75rem 1.5rem 2rem 3.5rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  box-shadow: 0 1.5rem 3.5rem rgb(54 43 23 / 12%);
}

.preview-title {
  min-height: 2.5rem;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 850;
}

.unread-count {
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  color: #fff;
  background: var(--accent);
  border-radius: 50%;
  font-size: 0.7rem;
}

.preview-message {
  margin-top: 0.65rem;
  padding: 0.85rem;
  background: #fbfaf6;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
}

.preview-message p {
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  line-height: 1.6;
}

.preview-message.emoji p {
  font-size: 1.35rem;
  letter-spacing: 0.1em;
}

.message-kind {
  display: inline-flex;
  padding: 0.25rem 0.5rem;
  color: #6c4137;
  background: #ffe4d9;
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 850;
}

.message-kind.prompt {
  color: #15523b;
  background: var(--mint);
}

.send-chip {
  position: absolute;
  right: -0.75rem;
  bottom: 1.25rem;
  min-height: 3rem;
  padding: 0.4rem 0.65rem 0.4rem 0.9rem;
  gap: 0.75rem;
  color: #fff;
  background: var(--ink);
  border-radius: 999px;
  box-shadow: 0 1rem 2.5rem rgb(28 33 31 / 20%);
  font-size: 0.78rem;
  font-weight: 800;
}

.send-chip strong {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--ink);
  background: #fff;
  border-radius: 50%;
}

.message-types {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-block: 1rem 6rem;
}

.message-types div {
  display: flex;
  min-height: 5rem;
  padding: 1rem;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  background: rgb(255 254 250 / 66%);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.message-types span {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  background: #fff;
  border-radius: 50%;
  font-size: 1.1rem;
}

.message-types strong {
  font-size: 0.9rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  padding: 0.2rem 1.15rem;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  border: 1px solid var(--ink);
  border-radius: 0.7rem;
  cursor: pointer;
  text-decoration: none;
}

.button:disabled {
  cursor: wait;
  opacity: 0.6;
}

.primary {
  color: white;
  background: var(--ink);
}

.secondary {
  color: var(--ink);
  background: rgb(255 255 255 / 62%);
}

.danger {
  color: #fff;
  background: #8a1f1a;
  border-color: #8a1f1a;
}

.button:hover:not(:disabled),
.emoji-grid button:hover {
  transform: translateY(-1px);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.feature-grid,
.composer,
.dashboard-grid {
  display: grid;
  gap: 1rem;
}

.feature-grid {
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 6rem;
}

.feature-grid article,
.panel,
.prose,
.composer > div,
.auth-card,
.settings-card,
.message-card,
.empty-state {
  background: rgb(255 254 250 / 82%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1.5rem 4rem rgb(54 43 23 / 6%);
}

.feature-grid article {
  min-height: 15rem;
  padding: 1.5rem;
}

.feature-grid article > span {
  display: inline-grid;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: 2.5rem;
  place-items: center;
  font-weight: 850;
  color: var(--accent-dark);
  background: #ffe4d9;
  border-radius: 50%;
}

.feature-grid h2 {
  font-size: 1.35rem;
}

.feature-grid p,
.composer p,
.form-help {
  line-height: 1.75;
  color: var(--muted);
}

.panel,
.prose {
  margin-bottom: 6rem;
  padding: clamp(1.5rem, 5vw, 4rem);
}

.metrics {
  display: grid;
  grid-template-columns: 0.8fr 1fr 2fr;
  gap: 1rem;
  margin: 3rem 0 0;
}

.metrics div {
  padding-top: 1rem;
  border-top: 2px solid var(--ink);
}

.metrics dt {
  margin-bottom: 0.75rem;
  color: var(--muted);
}

.metrics dd {
  margin: 0;
  font-weight: 700;
  line-height: 1.65;
}

.inbox-intro {
  padding-block: clamp(4rem, 8vw, 7rem) 3rem;
}

.inbox-intro h1,
.auth-card h1,
.dashboard-head h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
}

.composer {
  grid-template-columns: 0.8fr 1.2fr;
  margin-bottom: 6rem;
}

.composer > div {
  padding: clamp(1.4rem, 4vw, 2.5rem);
}

.composer h2,
.settings-card h2,
.message-column h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.emoji-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
  margin-top: 2rem;
}

.emoji-grid button {
  min-height: 5rem;
  font-size: 2rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  cursor: pointer;
}

.stack {
  display: grid;
  gap: 1rem;
}

.stack label,
.stack legend {
  font-weight: 750;
}

input,
textarea {
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.8rem 0.9rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid rgb(28 33 31 / 28%);
  border-radius: 0.65rem;
}

textarea {
  line-height: 1.65;
  resize: vertical;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.choice-grid label {
  display: flex;
  min-height: 3rem;
  padding: 0.7rem;
  gap: 0.5rem;
  align-items: center;
  background: white;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
}

.choice-grid input {
  width: auto;
  margin: 0;
  accent-color: var(--accent);
}

.check-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.check-row input {
  width: 1.1rem;
  height: 1.1rem;
  margin: 0;
  accent-color: var(--accent);
}

.form-help,
small {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--muted);
}

.notice {
  max-width: none;
  margin: 0 0 1rem;
  padding: 1rem;
  line-height: 1.6;
  border: 1px solid;
  border-radius: 0.75rem;
}

.notice.error {
  color: #7b251b;
  background: #fff0ec;
  border-color: #efb1a4;
}

.notice.success {
  color: #16543c;
  background: #e9faf2;
  border-color: #a7ddc6;
}

.hidden,
.honeypot {
  display: none !important;
}

.auth-card {
  width: min(34rem, 100%);
  margin: clamp(4rem, 10vw, 8rem) auto;
  padding: clamp(1.5rem, 5vw, 3rem);
}

.auth-card h1 {
  margin-bottom: 1.5rem;
}

.auth-card > p {
  line-height: 1.75;
  color: var(--muted);
}

.dashboard-head {
  display: flex;
  padding-block: clamp(3rem, 8vw, 6rem) 2rem;
  gap: 2rem;
  align-items: flex-end;
  justify-content: space-between;
}

.dashboard-grid {
  grid-template-columns: minmax(18rem, 0.75fr) minmax(0, 1.5fr);
  align-items: start;
  margin-bottom: 6rem;
}

.settings-card {
  position: sticky;
  top: 1rem;
  padding: 1.4rem;
}

.input-prefix {
  display: flex;
  margin-top: 0.4rem;
  align-items: center;
  background: white;
  border: 1px solid rgb(28 33 31 / 28%);
  border-radius: 0.65rem;
  overflow: hidden;
}

.input-prefix > span {
  padding-left: 0.9rem;
  color: var(--muted);
}

.input-prefix input {
  margin: 0;
  padding-left: 0.2rem;
  border: 0;
}

.share-box {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--mint);
  border-radius: 0.75rem;
  overflow-wrap: anywhere;
}

.share-box p {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  font-weight: 800;
}

.danger-zone {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.danger-zone summary {
  font-weight: 750;
  color: #7b251b;
  cursor: pointer;
}

.danger-zone > p {
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--muted);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  margin: 0 0 2rem;
}

.summary-grid div {
  padding: 1rem;
  background: rgb(255 254 250 / 74%);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
}

.summary-grid dt {
  font-size: 0.78rem;
  color: var(--muted);
}

.summary-grid dd {
  margin: 0.25rem 0 0;
  font-size: 1.8rem;
  font-weight: 850;
}

.section-heading,
.message-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2,
.section-heading .eyebrow {
  margin-bottom: 0;
}

.message-list {
  display: grid;
  gap: 0.75rem;
}

.message-card {
  padding: 1.25rem;
}

.message-card.unread {
  border-left: 4px solid var(--accent);
}

.message-card header {
  gap: 1rem;
  color: var(--muted);
}

.message-card time {
  font-size: 0.78rem;
}

.kind {
  color: var(--accent-dark);
}

.message-card > p {
  margin-block: 1.2rem;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.emoji-message {
  font-size: 2.5rem;
}

.text-button {
  padding: 0;
  color: var(--muted);
  background: none;
  border: 0;
  cursor: pointer;
  text-decoration: underline;
}

.empty-state {
  padding: 2rem;
  text-align: center;
}

.empty-state p {
  margin-inline: auto;
  color: var(--muted);
}

.preserve-lines {
  white-space: pre-wrap;
}

.prose {
  margin-top: 5rem;
}

.prose h1 {
  margin-bottom: 3rem;
  font-size: clamp(2rem, 4vw, 3.6rem);
}

.prose h2 {
  margin-top: 2.5rem;
  font-size: 1.5rem;
}

.prose p {
  font-size: 1.05rem;
  line-height: 1.9;
}

footer {
  min-height: 6rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

footer nav {
  display: flex;
  gap: 1rem;
}

@media (max-width: 50rem) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 39rem;
  }

  .inbox-preview {
    width: min(40rem, 100%);
    margin-inline: auto;
  }

  .feature-grid,
  .composer,
  .dashboard-grid {
    grid-template-columns: 1fr;
  }

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

  .settings-card {
    position: static;
  }
}

@media (max-width: 36rem) {
  .site-header nav > a:first-child {
    display: none;
  }

  .inbox-preview {
    min-height: 27rem;
    border-radius: 1.25rem;
  }

  .preview-inbox {
    inset: 2.5rem 0.75rem 1.5rem 1.5rem;
  }

  .profile-chip {
    left: 0;
  }

  .send-chip {
    right: -0.25rem;
  }

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

  .site-header nav {
    gap: 0.5rem;
  }

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

  .dashboard-head,
  footer {
    padding-block: 1.5rem;
    align-items: flex-start;
    flex-direction: column;
    gap: 1rem;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}