:root {
  --xuan: #f9f6f0;
  --xuan-2: #ede8de;
  --ink: #1c1c1a;
  --ink-2: #4e4e46;
  --muted: #77756b;
  --pale: #aaa69a;
  --seal: #c0392b;
  --seal-soft: #f2dedd;
  --brass: #bfa05a;
  --stone: #7a7a6e;
  --line: #ded7cb;
  --paper: #fffdf8;
  --white: #ffffff;
  --support-dark: #111110;
  --support-panel: #1b1b18;
  --support-text: #f8f4ea;
  --support-muted: #b9b4a8;
  --green: #2f8f6c;
  --blue: #355b8c;
  --shadow: 0 22px 56px rgba(28, 28, 26, .12);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--xuan);
  font-family: var(--sans);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 50;
  background: var(--ink);
  color: var(--xuan);
  padding: 10px 14px;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(222, 215, 203, .8);
  background: rgba(249, 246, 240, .92);
  backdrop-filter: blur(18px);
}

.support-page .site-header {
  border-bottom-color: rgba(255, 255, 255, .08);
  background: rgba(17, 17, 16, .9);
  color: var(--support-text);
}

.nav {
  width: min(1180px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand img {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
}

.brand-name {
  display: block;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: .14em;
  white-space: nowrap;
}

.brand-sub {
  display: block;
  margin-top: 1px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.support-page .brand-sub {
  color: var(--support-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-2);
  font-size: 14px;
}

.support-page .nav-links {
  color: var(--support-muted);
}

.nav-links a {
  border-radius: 6px;
  padding: 9px 12px;
}

.nav-links a:hover,
.nav-links a:focus {
  background: rgba(192, 57, 43, .08);
  color: var(--seal);
  outline: none;
}

.nav-cta {
  border: 1px solid var(--ink);
  color: var(--ink);
}

.support-page .nav-cta {
  border-color: rgba(248, 244, 234, .5);
  color: var(--support-text);
}

.hero {
  min-height: calc(100svh - 72px);
  position: relative;
  display: grid;
  align-items: center;
  background: #171611 url("assets/hero-ink-society.jpg") center / cover no-repeat;
  color: var(--white);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 17, 16, .9) 0%, rgba(17, 17, 16, .72) 42%, rgba(17, 17, 16, .32) 100%),
    linear-gradient(180deg, rgba(17, 17, 16, .18), rgba(17, 17, 16, .66));
}

.hero-inner {
  position: relative;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0 96px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: rgba(255, 253, 248, .78);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--seal);
}

.hero h1,
.support-hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(48px, 9vw, 108px);
  font-weight: 900;
  letter-spacing: .16em;
  line-height: 1.05;
}

.hero h2 {
  margin: 18px 0 0;
  max-width: 760px;
  font-family: var(--serif);
  font-size: clamp(25px, 4vw, 50px);
  font-weight: 800;
  letter-spacing: .08em;
  line-height: 1.25;
}

.hero-copy {
  max-width: 680px;
  margin: 24px 0 0;
  color: rgba(255, 253, 248, .84);
  font-size: clamp(16px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 11px 17px;
  font-weight: 800;
}

.button-primary {
  background: var(--seal);
  color: var(--white);
}

.button-secondary {
  border-color: rgba(255, 253, 248, .5);
  color: var(--white);
  background: rgba(255, 255, 255, .08);
}

.button-dark {
  background: var(--ink);
  color: var(--xuan);
}

.button-light {
  border-color: var(--line);
  color: var(--ink);
  background: var(--paper);
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
  color: rgba(255, 253, 248, .72);
  font-size: 13px;
}

.hero-proof span {
  border-left: 2px solid rgba(192, 57, 43, .82);
  padding-left: 10px;
}

.section {
  padding: 88px 0;
}

.section-paper {
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    var(--xuan);
  background-size: 28px 28px;
}

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

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

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-kicker {
  color: var(--seal);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.section h2 {
  margin: 8px 0 0;
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 48px);
  letter-spacing: .06em;
  line-height: 1.25;
}

.section-intro {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.section-dark .section-intro,
.section-dark .muted {
  color: rgba(249, 246, 240, .72);
}

.position-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  gap: 40px;
  align-items: start;
}

.lead-panel {
  border-left: 5px solid var(--seal);
  background: rgba(255, 253, 248, .78);
  padding: 28px;
  box-shadow: var(--shadow);
}

.lead-panel p {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.55;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 16px;
}

.stat b {
  display: block;
  color: var(--seal);
  font-family: var(--serif);
  font-size: 25px;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.phone-scene {
  position: sticky;
  top: 98px;
  border-radius: 8px;
  background: #151512;
  padding: 18px;
  box-shadow: 0 30px 72px rgba(28, 28, 26, .22);
}

.phone {
  width: min(100%, 338px);
  margin: 0 auto;
  border: 10px solid #111110;
  border-radius: 36px;
  background: var(--xuan);
  overflow: hidden;
  aspect-ratio: 338 / 718;
}

.phone-status {
  height: 42px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 0 18px 8px;
  font-size: 11px;
  font-weight: 800;
}

.phone-feed {
  padding: 14px;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    var(--xuan);
  background-size: 24px 24px;
}

.phone-date {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 900;
}

.phone-task {
  margin-top: 12px;
  border: 1.5px solid var(--ink);
  background: var(--white);
  display: flex;
  min-height: 88px;
}

.phone-task::before {
  content: "";
  width: 5px;
  background: var(--seal);
  flex: 0 0 auto;
}

.phone-task div {
  padding: 12px;
}

.phone-task b {
  display: block;
  font-family: var(--serif);
  line-height: 1.45;
}

.work-card {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  overflow: hidden;
}

.work-image {
  height: 170px;
  display: grid;
  place-items: center;
  background: #c8c3bb;
  position: relative;
}

.work-image::before {
  content: "静";
  color: rgba(255, 253, 248, .86);
  font-family: var(--serif);
  font-size: 82px;
  font-weight: 900;
}

.work-body {
  padding: 12px 13px 14px;
}

.work-body b {
  display: block;
  font-family: var(--serif);
}

.work-body span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.phone-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  background: var(--white);
}

.phone-tabs span {
  padding: 10px 2px;
  text-align: center;
  color: var(--pale);
  font-family: var(--serif);
  font-size: 12px;
  font-weight: 700;
}

.phone-tabs span:first-child {
  color: var(--ink);
  border-top: 3px solid var(--seal);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature,
.support-card,
.link-card,
.roadmap-item,
.difference-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature {
  min-height: 220px;
  padding: 24px;
}

.feature-icon,
.support-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--ink);
  color: var(--xuan);
  font-family: var(--serif);
  font-weight: 900;
}

.feature h3,
.support-card h3,
.difference-item h3,
.roadmap-item h3 {
  margin: 18px 0 8px;
  font-family: var(--serif);
  font-size: 21px;
}

.feature p,
.support-card p,
.difference-item p,
.roadmap-item p,
.link-card p {
  margin: 0;
  color: var(--muted);
}

.difference {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 28px;
  align-items: stretch;
}

.difference-copy {
  padding: 8px 0;
}

.difference-copy p {
  margin: 0;
  font-size: 19px;
}

.difference-list {
  display: grid;
  gap: 12px;
}

.difference-item {
  padding: 22px;
}

.difference-item h3 {
  margin-top: 0;
  color: var(--seal);
}

.roadmap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.roadmap-item {
  padding: 22px;
  background: rgba(255, 253, 248, .08);
  border-color: rgba(249, 246, 240, .18);
}

.roadmap-item small {
  color: var(--brass);
  font-weight: 900;
  letter-spacing: .12em;
}

.roadmap-item h3 {
  color: var(--xuan);
}

.route-note {
  margin-top: 28px;
  color: rgba(249, 246, 240, .68);
}

.footer {
  background: #121210;
  color: rgba(249, 246, 240, .82);
  padding: 36px 0;
}

.footer-grid {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer a {
  color: var(--xuan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer small {
  display: block;
  margin-top: 8px;
  color: rgba(249, 246, 240, .56);
}

.support-hero {
  position: relative;
  min-height: 460px;
  display: grid;
  align-items: center;
  background: #111110 url("assets/hero-ink-society.jpg") center / cover no-repeat;
  color: var(--support-text);
  overflow: hidden;
}

.support-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 17, 16, .94), rgba(17, 17, 16, .8), rgba(17, 17, 16, .52)),
    linear-gradient(180deg, rgba(17, 17, 16, .12), rgba(17, 17, 16, .9));
}

.support-hero .container {
  position: relative;
  padding: 74px 0;
}

.support-hero h1 {
  letter-spacing: .12em;
}

.support-hero p {
  max-width: 760px;
  margin: 22px 0 0;
  color: rgba(248, 244, 234, .78);
  font-size: 18px;
}

.support-shell {
  background: #f6f1e8;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.support-card {
  padding: 22px;
  background: var(--paper);
}

.support-card h3 {
  margin-top: 16px;
}

.contact-band {
  background: var(--ink);
  color: var(--xuan);
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 32px;
  align-items: center;
}

.contact-box {
  border: 1px solid rgba(249, 246, 240, .18);
  border-radius: 8px;
  padding: 24px;
  background: rgba(255, 255, 255, .06);
}

.contact-line {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(249, 246, 240, .12);
}

.contact-line:last-child {
  border-bottom: 0;
}

.contact-line span {
  color: rgba(249, 246, 240, .62);
  font-size: 13px;
}

.contact-line a,
.contact-line strong {
  color: var(--xuan);
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 900;
  overflow-wrap: anywhere;
}

.feedback-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.feedback-list li {
  position: relative;
  padding-left: 18px;
  color: rgba(249, 246, 240, .76);
}

.feedback-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .75em;
  width: 7px;
  height: 7px;
  background: var(--seal);
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.link-card {
  padding: 22px;
}

.link-card h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 21px;
}

.link-card a {
  display: inline-flex;
  margin-top: 14px;
  color: var(--seal);
  font-weight: 900;
}

.plain-block {
  border-left: 4px solid var(--seal);
  background: var(--paper);
  padding: 22px 24px;
}

.plain-block p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 920px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
    gap: 12px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero {
    min-height: 720px;
  }

  .hero::before {
    background:
      linear-gradient(180deg, rgba(17, 17, 16, .93), rgba(17, 17, 16, .72) 56%, rgba(17, 17, 16, .84)),
      linear-gradient(90deg, rgba(17, 17, 16, .32), rgba(17, 17, 16, .18));
  }

  .position-grid,
  .difference,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .phone-scene {
    position: relative;
    top: auto;
  }

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

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

@media (max-width: 640px) {
  .nav,
  .container,
  .hero-inner,
  .footer-grid {
    width: min(100% - 28px, 1180px);
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-sub {
    display: none;
  }

  .nav-links a {
    white-space: nowrap;
    padding: 8px 9px;
  }

  .hero {
    min-height: 680px;
    background-position: 63% center;
  }

  .hero-inner {
    padding: 58px 0 78px;
  }

  .hero h1,
  .support-hero h1 {
    letter-spacing: .1em;
  }

  .hero-copy,
  .support-hero p {
    font-size: 16px;
  }

  .section {
    padding: 62px 0;
  }

  .stat-grid,
  .feature-grid,
  .support-grid,
  .roadmap,
  .link-grid {
    grid-template-columns: 1fr;
  }

  .lead-panel,
  .feature,
  .support-card,
  .contact-box,
  .link-card,
  .plain-block {
    padding: 20px;
  }

  .phone-scene {
    padding: 12px;
  }

  .hero-actions .button {
    width: 100%;
    justify-content: center;
  }
}