@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&family=Syne:wght@600;700;800&display=swap");

:root {
  --ink: #0b1220;
  --ink-soft: #243044;
  --muted: #5c6b7a;
  --line: rgba(15, 30, 50, 0.1);
  --paper: #f3f6f4;
  --panel: rgba(255, 255, 255, 0.72);
  --teal: #0f8f86;
  --teal-deep: #0a6b64;
  --sand: #e8efe9;
  --glow: rgba(15, 143, 134, 0.22);
  --radius: 18px;
  --max: 1080px;
  --font-display: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.7;
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 90% 60% at 10% -10%, var(--glow), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 0%, rgba(36, 48, 68, 0.08), transparent 50%),
    linear-gradient(180deg, #eef4f1 0%, var(--paper) 42%, #e7eeea 100%);
}

a { color: var(--teal-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Hub / landing ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(243, 246, 244, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.topbar.is-solid {
  border-bottom-color: var(--line);
  background: rgba(243, 246, 244, 0.92);
}

.topbar-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
  color: var(--ink);
  text-decoration: none;
}

.logo span {
  color: var(--teal);
}

.top-nav {
  display: flex;
  gap: 22px;
  font-size: 0.92rem;
  font-weight: 500;
}

.top-nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.top-nav a:hover { color: var(--teal-deep); }

.hero {
  position: relative;
  overflow: hidden;
  min-height: min(92vh, 820px);
  display: flex;
  align-items: center;
}

.hero-visual {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(115deg, rgba(11, 18, 32, 0.04), transparent 40%),
    radial-gradient(circle at 78% 42%, rgba(15, 143, 134, 0.18), transparent 34%);
}

.hero-visual::before {
  content: "";
  position: absolute;
  right: -8%;
  top: 8%;
  width: min(58vw, 560px);
  height: min(58vw, 560px);
  border-radius: 40% 60% 55% 45%;
  background:
    conic-gradient(from 180deg at 50% 50%,
      rgba(15, 143, 134, 0.35),
      rgba(36, 48, 68, 0.12),
      rgba(15, 143, 134, 0.08),
      rgba(15, 143, 134, 0.35));
  filter: blur(2px);
  animation: morph 16s ease-in-out infinite;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 70% 45%, black, transparent 75%);
  opacity: 0.55;
}

@keyframes morph {
  0%, 100% { transform: translate(0, 0) rotate(0deg) scale(1); }
  50% { transform: translate(-3%, 4%) rotate(8deg) scale(1.04); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 72px 22px 88px;
  width: 100%;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.2rem, 9vw, 6.4rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
  margin: 0 0 22px;
  color: var(--ink);
  animation: rise 0.8s ease both;
}

.brand-mark .dot {
  color: var(--teal);
}

.hero-lead {
  max-width: 28rem;
  margin: 0 0 28px;
  font-size: 1.08rem;
  color: var(--ink-soft);
  animation: rise 0.8s ease 0.08s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: rise 0.8s ease 0.16s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--ink);
  color: #f7faf8;
}

.btn-primary:hover { background: #162033; color: #fff; }

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

.btn-ghost:hover {
  border-color: rgba(15, 143, 134, 0.45);
  color: var(--teal-deep);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 22px 72px;
}

.section-head {
  margin-bottom: 22px;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.03em;
  margin: 0 0 8px;
  border: 0;
  padding: 0;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal-deep);
}

.prose-block {
  max-width: 46rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

.prose-block p { margin: 0 0 14px; }
.prose-block p:last-child { margin-bottom: 0; }

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.about-point {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}

.about-point h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.about-point p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.app-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.app-item {
  display: block;
  padding: 28px 28px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(10px);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.app-item:hover {
  border-color: rgba(15, 143, 134, 0.35);
  background: rgba(255, 255, 255, 0.92);
}

.app-item.is-soon {
  opacity: 0.78;
}

.app-item-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 24px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.app-meta h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.app-meta .lede {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 40rem;
}

.app-tag {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--teal-deep);
}

.app-tag.soon {
  color: var(--muted);
}

.app-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.app-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.app-links a:hover {
  border-color: var(--teal);
  color: var(--teal-deep);
  text-decoration: none;
}

.app-body {
  margin-top: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.96rem;
}

.app-body p { margin: 0 0 12px; }

.app-body h4 {
  margin: 18px 0 10px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.feature-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.feature-grid li {
  margin: 0;
  padding: 14px 14px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.feature-grid strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
  font-size: 0.95rem;
}

.feature-grid span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.note-list {
  margin: 8px 0 0;
  padding-left: 1.15em;
  color: var(--muted);
  font-size: 0.92rem;
}

.note-list li { margin: 0.35em 0; }

.app-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  border-radius: 6px;
  background: rgba(11, 18, 32, 0.06);
}

.contact-strip {
  max-width: var(--max);
  margin: 0 auto 40px;
  padding: 0 22px;
}

.contact-strip .inner {
  padding: 22px 24px;
  border-radius: var(--radius);
  border: 1px dashed rgba(15, 143, 134, 0.35);
  background: rgba(15, 143, 134, 0.05);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.contact-strip strong {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 8px 22px 40px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.9;
}

.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--teal-deep); }

/* ---------- Legal document pages ---------- */

.site-header {
  background: var(--ink);
  color: #f3f6f4;
  padding: 14px 20px;
}

.site-header .inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-header .brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
  color: #fff;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 18px;
  font-size: 0.9rem;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.active {
  color: #fff;
}

main.doc {
  max-width: 760px;
  margin: 28px auto 0;
  padding: 36px 28px 48px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: 16px;
  backdrop-filter: blur(8px);
}

h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: -0.03em;
}

main.doc h2 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  margin: 32px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  letter-spacing: -0.02em;
}

.meta, .contact {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 12px;
}

main.doc ul { padding-left: 1.25em; margin: 0.5em 0 0; }
main.doc li { margin: 0.4em 0; }

.doc-footer.site-footer {
  margin-top: 28px;
  margin-bottom: 40px;
}

@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .app-item { padding: 22px 18px; }
  .hero-inner { padding-top: 48px; }
  .top-nav { gap: 14px; font-size: 0.86rem; }
  main.doc { margin: 16px 12px 0; padding: 24px 18px 36px; }
  .site-header .inner { justify-content: center; text-align: center; }
  .site-nav { width: 100%; justify-content: center; }
}