@import url("https://api.fontshare.com/v2/css?f[]=satoshi@400,500,700,900&display=swap");
@import url("https://unpkg.com/@phosphor-icons/web@2.1.1/src/regular/style.css");

/* z-index: grain 60, header 40, mobile sheet 45, toast 50 */

:root {
  --up-paper: #eef0f3;
  --up-elevated: #f7f8fa;
  --up-ink: #16171c;
  --up-muted: #5a5e68;
  --up-line: #d5d8de;
  --up-accent: #c2416a;
  --up-accent-strong: #9c3453;
  --up-accent-soft: #f3d6df;
  --up-radius: 12px;
  --up-header: 64px;
  --up-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --up-shadow: 0 18px 40px rgb(22 23 28 / 0.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --up-paper: #121318;
    --up-elevated: #1a1b21;
    --up-ink: #eceef2;
    --up-muted: #9aa0ab;
    --up-line: #2c2e36;
    --up-accent: #d45a7c;
    --up-accent-strong: #c2416a;
    --up-accent-soft: #3a2230;
    --up-shadow: 0 18px 40px rgb(0 0 0 / 0.35);
    color-scheme: dark;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--up-paper);
  color: var(--up-ink);
  font-family: "Satoshi", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    "Microsoft YaHei", sans-serif;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 70;
  border-radius: var(--up-radius);
  background: var(--up-accent-strong);
  color: #f7f8fa;
  padding: 0.5rem 0.9rem;
}

.skip-link:focus {
  top: 0.75rem;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.045;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='.85'/></svg>");
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--up-header);
  border-bottom: 1px solid var(--up-line);
  background: color-mix(in srgb, var(--up-paper) 86%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--up-paper);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1rem;
  gap: 1rem;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: inherit;
  text-decoration: none;
}

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--up-radius);
  background: var(--up-accent-strong);
  color: #f7f8fa;
  font-weight: 700;
  font-size: 0.95rem;
}

.brand-mark__name {
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.05rem;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 0.15rem;
}

.nav-desktop .btn {
  min-height: 2.25rem;
  padding: 0 0.9rem;
  font-size: 0.875rem;
}

.nav-link,
.nav-lang {
  display: inline-flex;
  align-items: center;
  border: 0;
  background: transparent;
  color: var(--up-muted);
  text-decoration: none;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.7rem;
  border-radius: var(--up-radius);
  cursor: pointer;
}

.nav-link:hover,
.nav-lang:hover {
  color: var(--up-ink);
  background: color-mix(in srgb, var(--up-ink) 5%, transparent);
}

.nav-toggle {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--up-line);
  border-radius: var(--up-radius);
  background: var(--up-elevated);
  color: var(--up-ink);
  cursor: pointer;
}

.nav-mobile {
  display: none;
  border-bottom: 1px solid var(--up-line);
  background: var(--up-paper);
  padding: 0.75rem 1rem 1rem;
}

.nav-mobile.is-open {
  display: grid;
  gap: 0.25rem;
}

.nav-mobile .nav-link,
.nav-mobile .nav-lang,
.nav-mobile .btn {
  width: 100%;
  justify-content: flex-start;
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
  .nav-toggle,
  .nav-mobile {
    display: none !important;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0 1.15rem;
  border-radius: var(--up-radius);
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 160ms var(--up-ease), background-color 160ms var(--up-ease);
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--up-accent-strong);
  color: #f7f8fa;
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--up-accent-strong) 88%, #000);
}

.btn--ghost {
  background: transparent;
  border-color: var(--up-line);
  color: var(--up-ink);
}

.btn--ghost:hover {
  background: var(--up-elevated);
}

.site-main {
  flex: 1;
}

.site-main--page {
  width: 100%;
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.site-footer {
  border-top: 1px solid var(--up-line);
  padding: 1.5rem 1rem;
  text-align: center;
  color: var(--up-muted);
  font-size: 0.75rem;
}

.toasts {
  position: sticky;
  top: var(--up-header);
  z-index: 50;
  display: grid;
  gap: 0.5rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 1rem 0;
}

.toast {
  border-radius: var(--up-radius);
  border: 1px solid var(--up-line);
  background: var(--up-elevated);
  color: var(--up-ink);
  padding: 0.8rem 1rem;
  font-size: 0.9rem;
}

.toast--error {
  border-color: #e8b4b4;
  background: #fdecec;
  color: #8a2a2a;
}

.toast--success {
  border-color: #b7d7c2;
  background: #e8f6ec;
  color: #215c38;
}

.toast--warning {
  border-color: #ead7a4;
  background: #fbf3de;
  color: #6d5314;
}

@media (prefers-color-scheme: dark) {
  .toast--error {
    border-color: #5a2a2a;
    background: #2a1616;
    color: #f0c4c4;
  }
  .toast--success {
    border-color: #2a4a34;
    background: #14221a;
    color: #b7e0c4;
  }
  .toast--warning {
    border-color: #4a3c18;
    background: #241c10;
    color: #ead7a4;
  }
}

.field-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--up-ink);
}

.field-help,
.field-error {
  margin: 0.35rem 0 0;
  font-size: 0.75rem;
}

.field-help {
  color: var(--up-muted);
}

.field-error {
  color: #b42318;
}

.field-input {
  width: 100%;
  border-radius: var(--up-radius);
  border: 1px solid var(--up-line);
  background: var(--up-elevated);
  color: var(--up-ink);
  padding: 0.75rem 1rem;
  font: inherit;
  font-size: 1rem;
}

#chat-form .field-input {
  width: auto;
  flex: 1 1 auto;
  min-width: 0;
}

.field-input::placeholder {
  color: color-mix(in srgb, var(--up-muted) 80%, var(--up-elevated));
}

.field-input:focus {
  outline: none;
  border-color: var(--up-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--up-accent) 28%, transparent);
}

.field-input--otp {
  letter-spacing: 0.5em;
  text-align: center;
  font-size: 1.125rem;
}

.site-card {
  background: var(--up-elevated);
  border: 1px solid var(--up-line);
  border-radius: var(--up-radius);
}

.home-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1rem;
}

.home-hero {
  display: grid;
  min-height: calc(100dvh - var(--up-header));
  align-items: center;
  gap: 2rem;
  padding: 2rem 0 3.5rem;
}

.home-eyebrow {
  margin: 0 0 1rem;
  color: var(--up-accent-strong);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.home-hero h1 {
  margin: 0;
  max-width: 14ch;
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.12;
}

.home-hero__lede {
  margin: 1rem 0 0;
  max-width: 36ch;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--up-muted);
}

.home-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.home-hero__media {
  position: relative;
}

.home-hero__media img {
  display: block;
  width: 100%;
  height: min(72vh, 680px);
  object-fit: cover;
  border-radius: var(--up-radius);
  box-shadow: var(--up-shadow);
}

@media (min-width: 768px) {
  .home-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 4rem;
    padding-top: 1.5rem;
  }
}

.home-bento {
  display: grid;
  gap: 1rem;
  padding: 1rem 0 4rem;
}

.home-bento article {
  border-radius: var(--up-radius);
  overflow: hidden;
  min-height: 14rem;
}

.home-bento__wide {
  position: relative;
  background: #1a1b21;
  color: #eceef2;
}

.home-bento__wide img {
  width: 100%;
  height: 100%;
  min-height: 18rem;
  object-fit: cover;
  display: block;
}

.home-bento__panel {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.5rem;
  background: linear-gradient(to top, rgb(18 19 24 / 0.88), transparent);
}

.home-bento__panel h2,
.home-tile h2 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.home-bento__panel p,
.home-tile p {
  margin: 0.5rem 0 0;
  max-width: 42ch;
  color: color-mix(in srgb, currentColor 78%, transparent);
  font-size: 0.95rem;
  line-height: 1.55;
}

.home-tile {
  padding: 1.5rem;
  background: var(--up-accent-strong);
  color: #f7f8fa;
}

.home-tile--photo {
  padding: 0;
  background: var(--up-elevated);
  color: var(--up-ink);
  display: grid;
}

.home-tile--photo img {
  width: 100%;
  height: 10rem;
  object-fit: cover;
  display: block;
}

.home-tile--photo div {
  padding: 1.25rem 1.5rem 1.5rem;
}

@media (min-width: 768px) {
  .home-bento {
    grid-template-columns: 1.35fr 1fr;
    grid-template-rows: auto auto;
  }
  .home-bento__wide {
    grid-row: span 2;
  }
  .home-bento__wide img {
    min-height: 100%;
  }
}

.home-manifesto {
  padding: 4.5rem 0 5rem;
  border-top: 1px solid var(--up-line);
}

.home-manifesto h2 {
  margin: 0;
  max-width: 12ch;
  font-size: clamp(2rem, 4vw, 3.25rem);
  letter-spacing: -0.04em;
  line-height: 1.12;
}

.home-manifesto p {
  margin: 1rem 0 0;
  max-width: 65ch;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--up-muted);
}

.home-rules {
  display: grid;
  gap: 2rem;
  padding: 0 0 5rem;
}

.home-rules h2 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
}

.home-rules p {
  margin: 0.6rem 0 0;
  max-width: 36ch;
  color: var(--up-muted);
  line-height: 1.65;
}

@media (min-width: 768px) {
  .home-rules {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding-bottom: 6rem;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--up-ease), transform 0.7s var(--up-ease);
}

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

.auth-shell {
  max-width: 28rem;
  margin: 0 auto;
}

.auth-shell--code {
  max-width: 22rem;
  text-align: center;
}

.text-btn {
  display: inline-flex;
  width: 100%;
  justify-content: center;
  border: 0;
  background: transparent;
  color: var(--up-accent-strong);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

.text-btn:hover {
  text-decoration: underline;
}

.auth-shell h1 {
  margin: 0 0 1.5rem;
  font-size: 1.75rem;
  letter-spacing: -0.03em;
}

.auth-shell .btn {
  width: 100%;
}

.auth-switch {
  margin-top: 1rem;
  text-align: center;
  color: var(--up-muted);
  font-size: 0.9rem;
}

.auth-switch a {
  color: var(--up-accent-strong);
  font-weight: 600;
  text-decoration: none;
}

.auth-switch a:hover {
  text-decoration: underline;
}

.radio-row {
  display: flex;
  gap: 1rem;
}

.radio-row label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal,
  .btn {
    transition: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  .btn:active {
    transform: none;
  }
}