/* 雪赴寒宵 — dark agency theme tokens & layout */

:root {
  --bg: #171717;
  --bg-elevated: #1e1e1e;
  --bg-soft: #222222;
  --fg: #f0f0f8;
  --fg-muted: #9a9aa8;
  --accent: #e4007c;
  --accent-soft: rgba(228, 0, 124, 0.16);
  --line: rgba(240, 240, 248, 0.1);
  --line-strong: rgba(240, 240, 248, 0.22);
  --radius: 2px;
  --radius-pill: 999px;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 7rem;
  --max: 72rem;
  --narrow: 42rem;
  --header-h: 4rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(228, 0, 124, 0.12), transparent 55%),
    radial-gradient(900px 500px at -10% 20%, rgba(120, 120, 255, 0.06), transparent 50%),
    var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; }
p { margin: 0; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
}
.skip-link:focus { left: 0; }

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

.mono { font-family: var(--font-mono); }
.muted { color: var(--fg-muted); }
.accent { color: var(--accent); }
.eyebrow {
  margin: 0 0 var(--space-3);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.section {
  padding: var(--space-8) 0;
}
.section-head { margin-bottom: var(--space-7); max-width: 40rem; }
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  margin-bottom: var(--space-4);
}
.section-title--sm { font-size: clamp(1.25rem, 2.2vw, 1.75rem); }
.section-lead { color: var(--fg-muted); max-width: 36rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.35rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: background 120ms var(--ease), border-color 120ms var(--ease), color 120ms var(--ease), transform 120ms var(--ease);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.btn--sm { padding: 0.55rem 1rem; font-size: 0.8125rem; }
.btn--accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn--accent:hover {
  background: #ff1a91;
  border-color: #ff1a91;
}
.btn--ghost:hover {
  border-color: var(--fg);
  background: rgba(240, 240, 248, 0.04);
}
.btn:active { transform: translateY(1px); }

.text-link {
  color: var(--fg);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}
.text-link:hover { color: var(--accent); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(23, 23, 23, 0.82);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-right: auto;
}
.brand__mark {
  width: 0.7rem;
  height: 0.7rem;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.brand__text {
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.95rem;
}
.nav-desktop { display: none; }
.nav-list {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}
.nav-list a {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--fg-muted);
  position: relative;
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms var(--ease);
}
.nav-list a:hover,
.nav-list .current-menu-item > a {
  color: var(--fg);
}
.nav-list a:hover::after,
.nav-list .current-menu-item > a::after {
  transform: scaleX(1);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-toggle {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  background: transparent;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  border-radius: var(--radius);
}
.nav-toggle span {
  display: block;
  width: 1rem;
  height: 1px;
  background: var(--fg);
  transition: transform 160ms var(--ease);
}
.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}
.nav-mobile {
  border-top: 1px solid var(--line);
  padding: 1rem 1.25rem 1.5rem;
  background: rgba(23, 23, 23, 0.96);
}
.nav-list--mobile {
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.nav-mobile__cta .btn { width: 100%; }

@media (min-width: 960px) {
  .nav-desktop { display: block; }
  .nav-toggle { display: none; }
  .nav-mobile { display: none !important; }
  .header-actions .btn--ghost { display: inline-flex; }
}

@media (max-width: 959px) {
  .header-actions .btn--ghost { display: none; }
}

/* Hero */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  padding: var(--space-8) 0 var(--space-7);
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__grid {
  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 at 50% 30%, #000 20%, transparent 70%);
  opacity: 0.55;
}
.hero__glow {
  position: absolute;
  width: 42vw;
  height: 42vw;
  right: -8%;
  top: 10%;
  background: radial-gradient(circle, rgba(228, 0, 124, 0.28), transparent 65%);
  filter: blur(8px);
  animation: pulse-glow 7s ease-in-out infinite;
}
.hero__content { position: relative; z-index: 1; max-width: 52rem; }
.hero__title {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: var(--space-5);
}
.brand-inline {
  display: block;
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.05;
}
.hero__claim {
  display: block;
  font-size: clamp(1.5rem, 3.8vw, 2.6rem);
  color: var(--fg);
  font-weight: 600;
}
.hero__claim em {
  font-style: normal;
  color: var(--accent);
}
.hero__sub {
  max-width: 38rem;
  color: var(--fg-muted);
  margin-bottom: var(--space-6);
  font-size: 1rem;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: var(--space-7);
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-top: var(--space-5);
  max-width: 36rem;
}
.hero__stats dt {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--fg);
}
.hero__stats dd {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}

/* Trust rail */
.trust-rail {
  padding-top: var(--space-5);
  padding-bottom: var(--space-7);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
}
.trust-rail__head { margin-bottom: var(--space-5); }
.trust-rail__note { font-size: 0.75rem; margin-top: 0.5rem; }
.trust-track {
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.trust-track__inner {
  display: flex;
  gap: 1rem;
  width: max-content;
  animation: trust-marquee 42s linear infinite;
}
.trust-card {
  width: min(22rem, 78vw);
  flex: 0 0 auto;
  margin: 0;
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  border-radius: var(--radius);
}
.trust-card p {
  font-size: 0.92rem;
  margin-bottom: 1rem;
  min-height: 4.5rem;
}
.trust-card footer { font-size: 0.75rem; }

@keyframes trust-marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.trust-track:hover .trust-track__inner {
  animation-play-state: paused;
}

/* Method chapters */
.method-chapters {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.method-chapter {
  border-top: 1px solid var(--line);
  padding: var(--space-7) 0;
  background: transparent;
  transition: background 200ms var(--ease);
}
.method-chapter:nth-child(even) {
  background: rgba(255, 255, 255, 0.015);
}
.method-chapter__inner {
  display: grid;
  gap: var(--space-5);
}
.method-chapter__num {
  display: inline-block;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
}
.method-chapter__name {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 0.75rem;
}
.method-chapter__line {
  color: var(--fg-muted);
  max-width: 28rem;
}
.method-chapter__points {
  display: grid;
  gap: 0.65rem;
}
.method-chapter__points li {
  padding-left: 1rem;
  position: relative;
  color: var(--fg);
  font-size: 0.92rem;
}
.method-chapter__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.4rem;
  height: 0.4rem;
  background: var(--accent);
}
.method-strip__foot {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line);
}

@media (min-width: 800px) {
  .method-chapter__inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
}

/* Friction CTA */
.friction-cta {
  background:
    linear-gradient(180deg, rgba(228, 0, 124, 0.08), transparent 60%),
    var(--bg-elevated);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.friction-cta__inner { max-width: 40rem; }
.friction-cta__title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: var(--space-4);
}
.friction-cta__sub {
  color: var(--fg-muted);
  margin-bottom: var(--space-5);
}
.friction-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: var(--space-5);
}
.friction-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  color: var(--fg-muted);
  font-size: 0.8rem;
}

/* Footer */
.site-footer {
  padding: var(--space-8) 0 var(--space-6);
  border-top: 1px solid var(--line);
}
.footer-top {
  display: grid;
  gap: var(--space-7);
  margin-bottom: var(--space-7);
}
.footer-brand__title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: var(--space-4);
}
.footer-brand__title strong { color: var(--accent); }
.footer-brand__lead { color: var(--fg-muted); max-width: 32rem; }
.footer-cols {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
}
.footer-col__label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 0.85rem;
}
.footer-links { display: grid; gap: 0.55rem; }
.footer-links a {
  color: var(--fg);
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms var(--ease), color 120ms var(--ease);
}
.footer-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  padding-top: var(--space-5);
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
}

@media (min-width: 900px) {
  .footer-top {
    grid-template-columns: 1.3fr 1fr;
    align-items: start;
  }
}

/* Inner pages */
.page-hero {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--line);
}
.page-hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--space-4);
}
.page-hero__sub {
  max-width: 40rem;
  color: var(--fg-muted);
}
.page-shell__title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-5);
}
.prose {
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 1.05rem;
}
.prose h2 {
  font-family: var(--font-mono);
  margin: 2rem 0 0.75rem;
  font-size: 1.35rem;
}
.prose p { margin-bottom: 1rem; color: var(--fg-muted); }
.prose a { color: var(--accent); border-bottom: 1px solid currentColor; }

.method-detail__card {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--line);
}
.method-detail__card h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin: 0.5rem 0 1rem;
}
.method-detail__card p {
  color: var(--fg-muted);
  max-width: 42rem;
  margin-bottom: 1.25rem;
}
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chip-list li {
  border: 1px solid var(--line);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: var(--fg);
}

.services-block { margin-bottom: var(--space-7); }
.services-block__cat {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
}
.services-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}
.service-card {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: 1.35rem 1.25rem;
  border-radius: var(--radius);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}
.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.service-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.65rem;
}
.service-card p {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.about-stats {
  display: grid;
  gap: 1rem;
  margin-top: var(--space-7);
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
}
.about-stats > div {
  border: 1px solid var(--line);
  padding: 1.1rem;
}
.about-stats dt {
  color: var(--accent);
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
}
.about-stats dd { margin: 0; color: var(--fg-muted); font-size: 0.9rem; }

/* Contact form */
.contact-layout {
  display: grid;
  gap: var(--space-7);
}
.contact-form-wrap {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: 1.5rem;
  border-radius: var(--radius);
}
.form-progress {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}
.form-progress span {
  flex: 1;
  height: 2px;
  background: var(--line-strong);
}
.form-progress span.is-active { background: var(--accent); }
.form-step h3 {
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}
.contact-form label {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem;
  outline: none;
  transition: border-color 120ms var(--ease);
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
}
.form-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.form-error { color: #ff7aa8; margin-top: 1rem; }
.form-success h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

@media (min-width: 900px) {
  .contact-layout {
    grid-template-columns: 0.75fr 1.25fr;
    align-items: start;
  }
}

/* Reveal: content visible by default; GSAP animates from() without permanent CSS hide */

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero__glow { animation: none; }
  .trust-track__inner { animation: none !important; transform: none !important; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}