/* 墨光 Mòguāng — ink mist + teal signal */
:root {
  --ink: #141821;
  --ink-soft: #2a3140;
  --mist: #e6ecef;
  --mist-deep: #d5dee4;
  --paper: #f4f7f8;
  --teal: #0f766e;
  --teal-bright: #14b8a6;
  --amber: #c27a3a;
  --line: rgba(20, 24, 33, 0.12);
  --shadow: rgba(20, 24, 33, 0.08);
  --radius: 14px;
  --font-display: "Fraunces", "Noto Serif SC", serif;
  --font-brand: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "Segoe UI", sans-serif;
  --space: clamp(1rem, 2.5vw, 2rem);
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(20, 184, 166, 0.14), transparent 55%),
    radial-gradient(900px 600px at 88% 8%, rgba(194, 122, 58, 0.1), transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, var(--mist) 42%, #dfe7ec 100%);
  overflow-x: hidden;
}

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

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

button,
input {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
}

.skip-link:focus {
  top: 1rem;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.field {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.25rem var(--space);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  min-width: max-content;
}

.brand-mark {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal-bright), var(--amber));
  box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.15);
  transform: translateY(-0.1rem);
}

.brand-name {
  font-family: var(--font-brand);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.15rem;
}

.brand-en {
  font-family: var(--font-brand);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: 0.7;
}

.nav {
  display: none;
  gap: 1.5rem;
  margin-left: auto;
  font-size: 0.92rem;
}

.nav a {
  position: relative;
  opacity: 0.72;
  transition: opacity 0.25s ease;
}

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

.nav a:hover,
.nav a:focus-visible {
  opacity: 1;
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-cta {
  margin-left: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.78rem 1.35rem;
  cursor: pointer;
  transition:
    transform 0.25s ease,
    background 0.25s ease,
    border-color 0.25s ease,
    color 0.25s ease,
    box-shadow 0.25s ease;
}

.btn:focus-visible,
.craft-tab:focus-visible,
input:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 12px 30px var(--shadow);
}

.btn-primary:hover {
  background: #0b0f16;
  transform: translateY(-1px);
}

.btn-ghost {
  border-color: var(--line);
  background: rgba(244, 247, 248, 0.55);
  backdrop-filter: blur(8px);
  font-size: 0.9rem;
  padding: 0.55rem 1rem;
}

.btn-ghost:hover {
  border-color: rgba(15, 118, 110, 0.35);
  color: var(--teal);
}

.btn-text {
  padding-left: 0.4rem;
  padding-right: 0.4rem;
  color: var(--ink-soft);
  border: none;
  background: transparent;
}

.btn-text:hover {
  color: var(--teal);
}

.hero {
  display: grid;
  gap: 2.5rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 8vh, 5.5rem) var(--space) clamp(3rem, 10vh, 6rem);
  min-height: calc(100vh - 5rem);
  align-content: center;
}

.brand-hero {
  margin: 0 0 0.75rem;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: clamp(2.6rem, 8vw, 5.5rem);
  letter-spacing: 0.08em;
  line-height: 0.95;
  background: linear-gradient(120deg, var(--ink) 20%, var(--teal) 55%, var(--amber) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero-title em {
  font-style: italic;
  font-weight: 500;
  color: var(--teal);
}

.hero-lead,
.section-lead {
  max-width: 34rem;
  color: var(--ink-soft);
}

.hero-lead {
  margin: 1.25rem 0 1.75rem;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.25rem;
}

.hero-meter {
  align-self: end;
  width: min(100%, 320px);
  padding: 1.1rem 1.2rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(244, 247, 248, 0.62);
  backdrop-filter: blur(10px);
  justify-self: start;
}

.meter-label {
  font-family: var(--font-brand);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 0.75rem;
}

.meter-wave {
  height: 48px;
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  align-items: end;
  gap: 3px;
  margin-bottom: 1rem;
}

.meter-wave span {
  display: block;
  width: 100%;
  border-radius: 999px 999px 2px 2px;
  background: linear-gradient(180deg, var(--teal-bright), var(--teal));
  transform-origin: bottom;
  animation: pulseBar 1.8s ease-in-out infinite;
}

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

.meter-stats span {
  display: block;
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 1.05rem;
}

.meter-stats small {
  color: var(--ink-soft);
  opacity: 0.7;
  font-size: 0.75rem;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3.5rem, 10vh, 6.5rem) var(--space);
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.5rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-brand);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}

.section h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.85rem, 4.2vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.rhythm-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.rhythm-index {
  font-family: var(--font-brand);
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.04em;
}

.rhythm-list h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
}

.rhythm-list p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 36rem;
}

.craft-stage {
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-radius: calc(var(--radius) + 6px);
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(244, 247, 248, 0.9), rgba(229, 238, 241, 0.72));
  box-shadow: 0 24px 60px rgba(20, 24, 33, 0.06);
}

.craft-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.craft-tab {
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  color: var(--ink-soft);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.craft-tab.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.craft-body {
  min-height: 11rem;
}

.craft-view h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.craft-view p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
  max-width: 38rem;
}

.craft-view ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
}

.craft-view li + li {
  margin-top: 0.35rem;
}

.craft-view {
  animation: fadeRise 0.45s ease;
}

.studio-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.studio-visual {
  margin: 0;
  position: relative;
  aspect-ratio: 1.15 / 1;
  border-radius: calc(var(--radius) + 10px);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 48%, rgba(20, 184, 166, 0.22), transparent 42%),
    radial-gradient(circle at 70% 30%, rgba(194, 122, 58, 0.18), transparent 35%),
    linear-gradient(160deg, #eef3f5, #d7e1e7);
  overflow: hidden;
  display: grid;
  place-items: center;
}

.orb-ring {
  width: min(58%, 240px);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(15, 118, 110, 0.35);
  box-shadow:
    0 0 0 18px rgba(20, 184, 166, 0.06),
    inset 0 0 40px rgba(20, 184, 166, 0.12);
  animation: spinSlow 18s linear infinite;
}

.orb-core {
  position: absolute;
  width: 18%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #7ee8d8, var(--teal) 55%, #0b4f4a);
  box-shadow: 0 0 40px rgba(20, 184, 166, 0.45);
  animation: breathe 3.6s ease-in-out infinite;
}

.studio-visual figcaption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  background: rgba(244, 247, 248, 0.7);
  backdrop-filter: blur(6px);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
}

.spec-list {
  display: grid;
  gap: 1rem;
  margin: 1.75rem 0 0;
}

.spec-list > div {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 0.75rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.spec-list dt {
  font-family: var(--font-brand);
  font-weight: 700;
  color: var(--teal);
}

.spec-list dd {
  margin: 0;
  color: var(--ink-soft);
}

.invite {
  padding-bottom: clamp(4rem, 12vh, 7rem);
}

.invite-shell {
  text-align: center;
  padding: clamp(2rem, 6vw, 3.5rem) 1.25rem;
  border-radius: calc(var(--radius) + 12px);
  border: 1px solid var(--line);
  background:
    radial-gradient(600px 240px at 50% 0%, rgba(20, 184, 166, 0.16), transparent 70%),
    rgba(244, 247, 248, 0.72);
}

.invite-brand {
  font-size: clamp(2rem, 6vw, 3.4rem);
}

.invite-shell h2 {
  max-width: 16ch;
  margin-left: auto;
  margin-right: auto;
}

.invite-shell .section-lead {
  margin-left: auto;
  margin-right: auto;
}

.invite-form {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
  margin-top: 1.75rem;
}

.invite-form input {
  width: min(100%, 280px);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.82rem 1.15rem;
  background: rgba(255, 255, 255, 0.75);
  color: var(--ink);
}

.form-note {
  min-height: 1.5rem;
  margin: 0.9rem 0 0;
  color: var(--teal);
  font-size: 0.95rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem var(--space) 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-brand);
  font-weight: 600;
  color: var(--ink);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@keyframes pulseBar {
  0%,
  100% {
    transform: scaleY(0.35);
    opacity: 0.55;
  }
  50% {
    transform: scaleY(1);
    opacity: 1;
  }
}

@keyframes fadeRise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes spinSlow {
  to {
    transform: rotate(360deg);
  }
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(0.92);
    opacity: 0.88;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}

@media (min-width: 768px) {
  .nav {
    display: flex;
  }

  .header-cta {
    margin-left: 0;
  }

  .hero {
    grid-template-columns: 1.35fr 0.65fr;
    align-items: end;
  }

  .hero-meter {
    justify-self: end;
    margin-bottom: 0.5rem;
  }

  .studio-grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 3.5rem;
  }
}

@media (min-width: 1024px) {
  .rhythm-list li {
    grid-template-columns: 6rem 1fr;
    gap: 1.5rem;
    padding: 1.9rem 0;
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .meter-wave span,
  .orb-ring,
  .orb-core,
  .craft-view {
    animation: none !important;
  }
}