/* ?????? � Brand: Ink Wave */
:root {
  --ink: #0e1116;
  --ink-soft: #1a1f28;
  --mist: #e6eaee;
  --paper: #f2f4f6;
  --muted: #6b7380;
  --lacquer: #c41e3a;
  --lacquer-deep: #9e1630;
  --signal: #1a8a8a;
  --signal-soft: #d4ecec;
  --line: rgba(14, 17, 22, 0.12);
  --line-light: rgba(242, 244, 246, 0.16);

  --font-brand: "ZCOOL XiaoWei", "Noto Serif SC", "Microsoft YaHei", "PingFang SC", serif;
  --font-display: "Syne", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Manrope", sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3.5rem;
  --space-xl: 6rem;
  --space-2xl: 9rem;

  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* �� Nav �� */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  padding: 1.1rem 0;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease),
    padding 0.4s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(242, 244, 246, 0.88);
  backdrop-filter: blur(14px);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.site-header.on-dark:not(.is-scrolled) {
  color: var(--paper);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  z-index: 2;
}

.brand__mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand__text {
  font-family: var(--font-brand);
  font-size: 1.35rem;
  letter-spacing: 0.12em;
  line-height: 1;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__links a {
  position: relative;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  opacity: 0.82;
  transition: opacity 0.25s var(--ease);
}

.nav__links a:hover,
.nav__links a[aria-current="page"] {
  opacity: 1;
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.nav__links a:hover::after,
.nav__links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  position: relative;
  z-index: 2;
}

.nav__toggle span {
  display: block;
  width: 1.35rem;
  height: 1.5px;
  margin: 0.35rem auto;
  background: currentColor;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* �� Buttons �� */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.95rem 1.6rem;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  border-radius: 2px;
  transition: background 0.3s var(--ease), color 0.3s var(--ease),
    border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

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

.btn--primary {
  background: var(--lacquer);
  color: var(--paper);
}

.btn--primary:hover {
  background: var(--lacquer-deep);
}

.btn--ghost {
  border: 1px solid currentColor;
  color: inherit;
  background: transparent;
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.btn--ink {
  background: var(--ink);
  color: var(--paper);
}

.btn--ink:hover {
  background: var(--ink-soft);
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* �� Hero �� */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--paper);
  overflow: hidden;
  isolation: isolate;
}

.hero__visual {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 60% at 70% 40%, rgba(26, 138, 138, 0.28), transparent 55%),
    radial-gradient(ellipse 50% 45% at 20% 70%, rgba(196, 30, 58, 0.22), transparent 50%),
    linear-gradient(160deg, #07090c 0%, #121820 45%, #0e1116 100%);
}

.hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(242, 244, 246, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 244, 246, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 65% 45%, black, transparent 75%);
  animation: grid-drift 28s linear infinite;
}

.hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(7, 9, 12, 0.92) 0%, transparent 42%),
    linear-gradient(to right, rgba(7, 9, 12, 0.55) 0%, transparent 50%);
}

.hero__mesh {
  position: absolute;
  inset: 8% 5% 20% 35%;
  z-index: -1;
  opacity: 0.55;
  pointer-events: none;
}

.hero__mesh svg {
  width: 100%;
  height: 100%;
}

.hero__content {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 8rem 0 5.5rem;
}

.hero__brand {
  font-family: var(--font-brand);
  font-size: clamp(3.4rem, 9vw, 6.5rem);
  letter-spacing: 0.14em;
  line-height: 1.05;
  margin-bottom: 1.4rem;
  animation: rise 1s var(--ease) both;
}

.hero__headline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  letter-spacing: 0.04em;
  max-width: 18em;
  margin-bottom: 0.85rem;
  animation: rise 1s var(--ease) 0.12s both;
}

.hero__lead {
  font-size: 1.05rem;
  color: rgba(242, 244, 246, 0.72);
  max-width: 28em;
  margin-bottom: 2rem;
  animation: rise 1s var(--ease) 0.22s both;
}

.hero .cta-group {
  animation: rise 1s var(--ease) 0.32s both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes grid-drift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(-64px, -32px, 0);
  }
}

@keyframes pulse-node {
  0%,
  100% {
    opacity: 0.45;
  }
  50% {
    opacity: 1;
  }
}

.mesh-node {
  animation: pulse-node 4.5s ease-in-out infinite;
}

.mesh-node:nth-child(2) {
  animation-delay: 0.8s;
}

.mesh-node:nth-child(3) {
  animation-delay: 1.6s;
}

.mesh-node:nth-child(4) {
  animation-delay: 2.2s;
}

/* �� Sections �� */
.section {
  padding: var(--space-xl) 0;
}

.section--tight {
  padding: var(--space-lg) 0;
}

.section--ink {
  background: var(--ink);
  color: var(--paper);
}

.section--mist {
  background: var(--mist);
}

.section__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.85rem;
}

.section--ink .section__eyebrow {
  color: #5ec4c4;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 650;
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  letter-spacing: 0.02em;
  line-height: 1.25;
  margin-bottom: 1rem;
  max-width: 14em;
}

.section__lead {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 36em;
  margin-bottom: 2.5rem;
}

.section--ink .section__lead {
  color: rgba(242, 244, 246, 0.68);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.split__visual {
  min-height: 360px;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(26, 138, 138, 0.18), transparent 50%),
    linear-gradient(225deg, rgba(196, 30, 58, 0.14), transparent 45%),
    var(--ink);
}

.split__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 30% 40%, var(--lacquer) 0 3px, transparent 4px),
    radial-gradient(circle at 62% 28%, var(--signal) 0 3px, transparent 4px),
    radial-gradient(circle at 70% 68%, var(--lacquer) 0 2.5px, transparent 3.5px),
    radial-gradient(circle at 38% 72%, var(--signal) 0 2.5px, transparent 3.5px),
    radial-gradient(circle at 52% 50%, var(--paper) 0 4px, transparent 5px);
  opacity: 0.9;
}

.split__panel {
  padding: 0.5rem 0;
}

.prose p + p {
  margin-top: 1rem;
}

.prose strong {
  font-weight: 600;
  color: var(--ink);
}

.section--ink .prose strong {
  color: var(--paper);
}

/* �� Service list (no cards) �� */
.service-list {
  border-top: 1px solid var(--line);
}

.service-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: 1.25rem;
  align-items: baseline;
  padding: 1.65rem 0;
  border-bottom: 1px solid var(--line);
  transition: padding 0.35s var(--ease);
}

.service-item:hover {
  padding-left: 0.5rem;
}

.service-item__index {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--lacquer);
}

.service-item__title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.service-item__desc {
  color: var(--muted);
  max-width: 38em;
  font-size: 0.98rem;
}

.service-item__link {
  font-size: 0.88rem;
  letter-spacing: 0.06em;
  color: var(--signal);
  white-space: nowrap;
  align-self: center;
}

.section--ink .service-list,
.section--ink .service-item {
  border-color: var(--line-light);
}

.section--ink .service-item__desc {
  color: rgba(242, 244, 246, 0.62);
}

/* �� Values strip �� */
.value-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding-top: 0.5rem;
}

.value-row h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.55rem;
}

.value-row p {
  color: var(--muted);
  font-size: 0.95rem;
}

.value-row__rule {
  width: 2rem;
  height: 2px;
  background: var(--lacquer);
  margin-bottom: 1rem;
}

/* �� Page hero (inner) �� */
.page-hero {
  padding: 9rem 0 3.5rem;
  background:
    radial-gradient(ellipse 60% 80% at 100% 0%, rgba(26, 138, 138, 0.12), transparent 55%),
    radial-gradient(ellipse 40% 50% at 0% 100%, rgba(196, 30, 58, 0.08), transparent 50%),
    var(--mist);
}

.page-hero__title {
  font-family: var(--font-brand);
  font-size: clamp(2.6rem, 6vw, 4rem);
  letter-spacing: 0.12em;
  line-height: 1.15;
  margin-bottom: 0.85rem;
}

.page-hero__lead {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 32em;
}

/* �� Contact �� */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.contact-meta dt {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.35rem;
}

.contact-meta dd {
  font-size: 1.15rem;
  margin-bottom: 1.75rem;
}

.contact-meta a:hover {
  color: var(--lacquer);
}

.contact-form {
  display: grid;
  gap: 1.1rem;
}

.field label {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
  color: var(--muted);
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
  font: inherit;
  color: var(--ink);
  transition: border-color 0.25s var(--ease);
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--signal);
}

.field textarea {
  min-height: 140px;
  resize: vertical;
}

.form-note {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.form-success {
  display: none;
  padding: 1rem 0;
  color: var(--signal);
}

.contact-form.is-sent .form-fields {
  display: none;
}

.contact-form.is-sent .form-success {
  display: block;
}

/* �� Brand board (home) �� */
.brand-board {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.swatches {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.swatch {
  aspect-ratio: 1 / 1.15;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.swatch--ink {
  background: var(--ink);
  color: var(--paper);
}

.swatch--mist {
  background: var(--mist);
  color: var(--ink);
  border: 1px solid var(--line);
}

.swatch--lacquer {
  background: var(--lacquer);
  color: var(--paper);
}

.swatch--signal {
  background: var(--signal);
  color: var(--paper);
}

.type-sample {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.type-sample__brand {
  font-family: var(--font-brand);
  font-size: 2.4rem;
  letter-spacing: 0.14em;
  margin-bottom: 0.5rem;
}

.type-sample__display {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.type-sample__body {
  color: var(--muted);
  font-size: 0.95rem;
}

.logo-lockup {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.logo-lockup img {
  width: 64px;
  height: 64px;
}

.logo-lockup span {
  font-family: var(--font-brand);
  font-size: 2rem;
  letter-spacing: 0.14em;
}

/* �� Reveal �� */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* �� Footer �� */
.site-footer {
  background: var(--ink);
  color: rgba(242, 244, 246, 0.7);
  padding: 3.5rem 0 2rem;
}

.footer__top {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--line-light);
}

.footer__brand {
  font-family: var(--font-brand);
  font-size: 1.6rem;
  letter-spacing: 0.12em;
  color: var(--paper);
  margin-bottom: 0.5rem;
}

.footer__links {
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.footer__links a:hover {
  color: var(--paper);
}

.footer__bottom {
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

/* �� Responsive �� */
@media (max-width: 860px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: fixed;
    inset: 0;
    background: var(--paper);
    color: var(--ink);
    flex-direction: column;
    justify-content: center;
    gap: 1.75rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s var(--ease);
  }

  .nav__links.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .site-header.on-dark:not(.is-scrolled) .nav__toggle {
    color: var(--paper);
  }

  .split,
  .brand-board,
  .contact-grid,
  .value-row {
    grid-template-columns: 1fr;
  }

  .service-item {
    grid-template-columns: 3rem 1fr;
  }

  .service-item__link {
    grid-column: 2;
  }

  .hero__mesh {
    inset: 5% -10% 35% 20%;
    opacity: 0.35;
  }

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

@media (max-width: 520px) {
  .hero__content {
    padding-bottom: 4rem;
  }

  .cta-group {
    width: 100%;
  }

  .cta-group .btn {
    width: 100%;
  }
}