/* QUZJ — light business trust + clean tools */
:root {
  --ink: #15202b;
  --ink-soft: #3d4f5f;
  --muted: #6b7c8c;
  --line: rgba(21, 32, 43, 0.1);
  --paper: #f3f6f8;
  --paper-2: #e8eef2;
  --surface: #ffffff;
  --accent: #0f6e6a;
  --accent-deep: #0a524f;
  --accent-soft: rgba(15, 110, 106, 0.12);
  --focus: #1a8a84;
  --max: 68rem;
  --nav-h: 4rem;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "SF Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

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

  .reveal,
  .hero__brand,
  .hero__tagline,
  .hero__lead,
  .hero__actions,
  .hero__glow,
  .hero__grid,
  .hero__wave-path {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  .hero__wave-path--soft {
    opacity: 0.25 !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 12% -10%, rgba(15, 110, 106, 0.09), transparent 55%),
    radial-gradient(900px 500px at 100% 8%, rgba(61, 79, 95, 0.08), transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: #fff;
  padding: 0.5rem 0.75rem;
  z-index: 100;
  border-radius: 0.25rem;
}

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

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Nav — align with dark hero banner */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(8, 18, 24, 0.82);
  border-bottom: 1px solid rgba(232, 244, 241, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 1rem;
}

.nav__brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #f2faf8;
  text-decoration: none;
  font-size: 1.125rem;
}

.nav__brand:hover {
  color: #9fd9cf;
}

.nav__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
}

.nav__links a {
  color: rgba(210, 228, 224, 0.78);
  text-decoration: none;
}

.nav__links a:hover,
.nav__links a[aria-current="page"] {
  color: #f4fbf9;
}

/* Hero — full-bleed banner */
.hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  min-height: min(92vh, 48rem);
  margin-top: calc(var(--nav-h) * -1);
  padding: calc(var(--nav-h) + clamp(3rem, 8vw, 5.5rem)) 0 clamp(3.25rem, 7vw, 5.25rem);
  overflow: hidden;
  color: #eef5f4;
  background: #0b161c;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(145deg, #071116 0%, #0d2228 42%, #0a1a1f 72%, #102a28 100%);
}

.hero__grid {
  position: absolute;
  inset: -20%;
  background-image:
    linear-gradient(rgba(232, 244, 242, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 244, 242, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 65% at 40% 45%, #000 20%, transparent 75%);
  animation: grid-drift 28s linear infinite;
  opacity: 0.9;
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(48px);
  will-change: transform, opacity;
}

.hero__glow--a {
  width: min(52vw, 28rem);
  height: min(52vw, 28rem);
  left: -8%;
  top: 8%;
  background: rgba(20, 140, 128, 0.38);
  animation: glow-a 12s var(--ease) infinite alternate;
}

.hero__glow--b {
  width: min(48vw, 26rem);
  height: min(48vw, 26rem);
  right: -6%;
  bottom: 5%;
  background: rgba(56, 110, 150, 0.28);
  animation: glow-b 14s var(--ease) infinite alternate;
}

.hero__glow--c {
  width: min(30vw, 16rem);
  height: min(30vw, 16rem);
  left: 42%;
  top: 18%;
  background: rgba(180, 210, 200, 0.12);
  animation: glow-c 10s var(--ease) infinite alternate;
}

.hero__wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6%;
  width: 100%;
  height: clamp(7rem, 22vw, 13rem);
  opacity: 0.85;
}

.hero__wave-path {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero__wave-path--soft {
  stroke: rgba(150, 210, 200, 0.22);
  stroke-width: 1.5;
  animation: wave-soft 9s ease-in-out infinite alternate;
}

.hero__wave-path--main {
  stroke: rgba(110, 210, 195, 0.55);
  stroke-width: 2.25;
  filter: drop-shadow(0 0 10px rgba(80, 190, 175, 0.35));
  animation: wave-main 7s ease-in-out infinite alternate;
}

.hero__vignette {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 17, 22, 0.55) 0%, transparent 42%),
    linear-gradient(180deg, rgba(7, 17, 22, 0.25) 0%, transparent 35%, rgba(7, 17, 22, 0.55) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 42rem;
}

.hero__brand {
  margin: 0 0 1rem;
  font-size: clamp(3rem, 9vw, 4.75rem);
  line-height: 1.02;
  letter-spacing: 0.08em;
  font-weight: 750;
  color: #f4fbf9;
  text-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
  animation: rise 0.75s var(--ease) both;
}

.hero__tagline {
  margin: 0 0 1.25rem;
  font-size: clamp(0.92rem, 2.3vw, 1.1rem);
  color: rgba(210, 230, 226, 0.88);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  line-height: 1.75;
  animation: rise 0.75s var(--ease) 0.08s both;
}

.hero__tagline span {
  white-space: nowrap;
}

.hero__lead {
  margin: 0 0 1.85rem;
  max-width: 34rem;
  font-size: 1.1rem;
  color: rgba(198, 218, 214, 0.86);
  animation: rise 0.75s var(--ease) 0.16s both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: rise 0.75s var(--ease) 0.24s both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes grid-drift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(28px, 28px, 0);
  }
}

@keyframes glow-a {
  from {
    transform: translate(0, 0) scale(1);
    opacity: 0.75;
  }
  to {
    transform: translate(6%, 8%) scale(1.08);
    opacity: 1;
  }
}

@keyframes glow-b {
  from {
    transform: translate(0, 0) scale(1);
    opacity: 0.65;
  }
  to {
    transform: translate(-8%, -6%) scale(1.12);
    opacity: 0.95;
  }
}

@keyframes glow-c {
  from {
    transform: translate(0, 0);
    opacity: 0.45;
  }
  to {
    transform: translate(-4%, 10%);
    opacity: 0.8;
  }
}

@keyframes wave-main {
  from {
    transform: translateX(0);
    opacity: 0.7;
  }
  to {
    transform: translateX(-2%);
    opacity: 1;
  }
}

@keyframes wave-soft {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(2.5%);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0.65rem 1.2rem;
  border-radius: 0.35rem;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.9875rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-deep);
  color: #fff;
}

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

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

/* Must follow .btn--ghost so dark-hero CTA stays readable */
a.btn--ghost-on-dark,
.btn--ghost-on-dark {
  color: #f2faf8;
  border-color: rgba(232, 244, 241, 0.45);
  background: rgba(255, 255, 255, 0.1);
}

a.btn--ghost-on-dark:hover,
.btn--ghost-on-dark:hover {
  color: #fff;
  border-color: rgba(160, 230, 215, 0.85);
  background: rgba(15, 110, 106, 0.4);
}

/* Sections */
.section {
  padding: clamp(2.5rem, 6vw, 4rem) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section__eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 650;
}

.section__title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3.5vw, 1.85rem);
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.section__desc {
  margin: 0 0 1.75rem;
  max-width: 38rem;
  color: var(--ink-soft);
}

.services {
  display: grid;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (min-width: 720px) {
  .services {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

.services h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.services p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.975rem;
}

.tool-teaser {
  display: grid;
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .tool-teaser {
    grid-template-columns: 1fr auto;
    align-items: end;
  }
}

.tool-teaser h3 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
}

.tool-teaser p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 40rem;
}

/* Partners — masked names */
.partners-note {
  margin: 0 0 1.25rem;
  font-size: 0.9375rem;
  color: var(--muted);
}

.partners {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.65rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.partners li {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding: 0.45rem 0.7rem;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  border-radius: 0.25rem;
}

.partners li[aria-hidden="true"] {
  opacity: 0.35;
}

/* Blog placeholder */
.placeholder-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.placeholder-list li {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.975rem;
}

.placeholder-list strong {
  display: block;
  color: var(--ink-soft);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

/* Social + contact */
.socials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.socials a,
.socials span {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 600;
}

.socials a:hover {
  color: var(--accent);
}

.socials .soon {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.9rem;
}

.contact-panel {
  display: grid;
  gap: 1rem;
  max-width: 28rem;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-row dt {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 650;
}

.contact-row dd {
  margin: 0;
  font-size: 1.125rem;
  font-family: var(--font-mono);
}

.contact-row a {
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
}

.contact-row a:hover {
  color: var(--accent);
}

.copy-hint {
  margin: 0.35rem 0 0;
  font-size: 0.8125rem;
  color: var(--muted);
  font-family: var(--font);
}

/* Page chrome for inner pages */
.page-hero {
  padding: clamp(2.5rem, 6vw, 3.5rem) 0 1.5rem;
}

.page-hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
}

.page-hero p {
  margin: 0;
  max-width: 40rem;
  color: var(--ink-soft);
}

.prose {
  max-width: 40rem;
  padding-bottom: 3rem;
}

.prose h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.25rem;
}

.prose p,
.prose ul {
  color: var(--ink-soft);
}

.prose ul {
  padding-left: 1.2rem;
}

.tool-card {
  display: block;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}

.tool-card:hover h2 {
  color: var(--accent-deep);
}

.tool-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
  transition: color 0.2s var(--ease);
}

.tool-card p {
  margin: 0;
  color: var(--ink-soft);
}

/* Footer */
.site-footer {
  margin-top: 2rem;
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.875rem;
  color: var(--muted);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: baseline;
}

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

.site-footer a:hover {
  color: var(--accent);
}

.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

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

/* Changelog timeline */
.timeline {
  --axis: var(--accent);
  --axis-soft: rgba(15, 110, 106, 0.28);
  list-style: none;
  margin: 0;
  padding: 0 0 2rem;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 0.35rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--axis) 0%,
    var(--axis-soft) 55%,
    transparent 100%
  );
}

@media (min-width: 720px) {
  .timeline::before {
    left: 7.25rem;
  }
}

.timeline__item {
  position: relative;
  padding: 0 0 2rem 2rem;
  display: grid;
  gap: 0.35rem 1.25rem;
}

@media (min-width: 720px) {
  .timeline__item {
    grid-template-columns: 6.5rem 1fr;
    padding-left: 0;
    column-gap: 2.5rem;
  }
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 0.45rem;
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--axis);
  box-shadow: 0 0 0 4px rgba(15, 110, 106, 0.12);
  z-index: 1;
}

@media (min-width: 720px) {
  .timeline__item::before {
    left: 7rem;
  }
}

.timeline__item--today::before {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 5px rgba(15, 110, 106, 0.22);
}

.timeline__date {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-weight: 600;
}

.timeline__item--today .timeline__date {
  color: var(--accent-deep);
}

.timeline__date-badge {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.1rem 0.4rem;
  border-radius: 0.2rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--accent-soft);
  color: var(--accent-deep);
  vertical-align: middle;
}

.timeline__body {
  min-width: 0;
}

.timeline__title {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
  line-height: 1.35;
}

.timeline__body p {
  margin: 0 0 0.55rem;
  color: var(--ink-soft);
  font-size: 0.975rem;
}

.timeline__body ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.timeline__body li + li {
  margin-top: 0.25rem;
}