/* roulang page: index */
:root {
      --bg: #121018;
      --bg-deep: #0c0a11;
      --panel: #1a1423;
      --panel-2: #21182d;
      --panel-soft: rgba(255, 255, 255, .055);
      --text: #f7f2ff;
      --muted: #c9c2d6;
      --subtle: #8f879e;
      --line: rgba(214, 190, 255, .16);
      --line-strong: rgba(209, 91, 143, .42);
      --purple: #b15cff;
      --purple-2: #d15b8f;
      --orange: #ffb35c;
      --green: #7ee0c3;
      --shadow: 0 22px 70px rgba(0, 0, 0, .35);
      --shadow-soft: 0 14px 44px rgba(177, 92, 255, .16);
      --radius-lg: 28px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --container: 1200px;
      --header-h: 76px;
      --ease: cubic-bezier(.2, .8, .2, 1);
      color-scheme: dark;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: calc(var(--header-h) + 20px);
    }

    body {
      min-height: 100vh;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      line-height: 1.75;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(177, 92, 255, .22), transparent 34%),
        radial-gradient(circle at 88% 18%, rgba(209, 91, 143, .18), transparent 30%),
        radial-gradient(circle at 52% 84%, rgba(255, 179, 92, .08), transparent 38%),
        linear-gradient(180deg, #15111d 0%, var(--bg) 46%, #0d0a12 100%);
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: -2;
      opacity: .36;
      background-image:
        linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
      background-size: 44px 44px;
      mask-image: radial-gradient(circle at center, #000 0%, transparent 78%);
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
    }

    button,
    input,
    textarea {
      font: inherit;
    }

    button {
      border: 0;
      cursor: pointer;
      color: inherit;
      background: none;
    }

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

    :focus-visible {
      outline: 3px solid rgba(177, 92, 255, .55);
      outline-offset: 4px;
      border-radius: 10px;
    }

    .container {
      width: min(100% - 48px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      height: var(--header-h);
      border-bottom: 1px solid rgba(255,255,255,.08);
      background: rgba(15, 12, 21, .78);
      backdrop-filter: blur(18px);
    }

    .nav-shell {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: max-content;
      font-weight: 800;
      letter-spacing: .02em;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 15px;
      background:
        radial-gradient(circle at 30% 24%, rgba(255,255,255,.28), transparent 28%),
        linear-gradient(135deg, var(--purple), var(--purple-2));
      box-shadow: 0 14px 34px rgba(177, 92, 255, .28);
      position: relative;
      overflow: hidden;
    }

    .brand-mark::after {
      content: "";
      width: 0;
      height: 0;
      border-top: 8px solid transparent;
      border-bottom: 8px solid transparent;
      border-left: 12px solid #fff;
      margin-left: 3px;
      filter: drop-shadow(0 2px 6px rgba(0,0,0,.24));
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.12;
    }

    .brand-text strong {
      font-size: 18px;
      color: var(--text);
    }

    .brand-text span {
      font-size: 12px;
      font-weight: 600;
      color: var(--subtle);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 7px;
      border: 1px solid rgba(255,255,255,.08);
      border-radius: 999px;
      background: rgba(255,255,255,.045);
    }

    .nav-link {
      min-height: 40px;
      display: inline-flex;
      align-items: center;
      padding: 0 16px;
      border-radius: 999px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 650;
      white-space: nowrap;
    }

    .nav-link:hover,
    .nav-link.active {
      color: #fff;
      background: rgba(177, 92, 255, .16);
    }

    .header-actions {
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }

    .menu-toggle {
      display: none;
      width: 46px;
      height: 46px;
      border: 1px solid rgba(255,255,255,.12);
      border-radius: 15px;
      background: rgba(255,255,255,.06);
    }

    .menu-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      margin: 5px auto;
      border-radius: 999px;
      background: var(--text);
      transition: transform .22s var(--ease), opacity .22s var(--ease);
    }

    .menu-toggle.is-open span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    .menu-toggle.is-open span:nth-child(2) {
      opacity: 0;
    }

    .menu-toggle.is-open span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    .btn {
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 0 20px;
      border-radius: 999px;
      font-weight: 750;
      font-size: 14px;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--purple), var(--purple-2));
      box-shadow: 0 14px 34px rgba(177, 92, 255, .26);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 44px rgba(209, 91, 143, .32);
      filter: brightness(1.06);
    }

    .btn-secondary {
      color: var(--text);
      border-color: rgba(177, 92, 255, .42);
      background: rgba(255,255,255,.045);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      border-color: rgba(209, 91, 143, .66);
      background: rgba(177, 92, 255, .14);
      box-shadow: var(--shadow-soft);
    }

    .btn-ghost {
      color: var(--muted);
      border-color: rgba(255,255,255,.12);
      background: rgba(255,255,255,.035);
    }

    .btn-ghost:hover {
      color: #fff;
      border-color: rgba(177, 92, 255, .36);
      background: rgba(177, 92, 255, .12);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      min-height: 28px;
      padding: 4px 11px;
      border-radius: 999px;
      color: #f7eaff;
      font-size: 12px;
      font-weight: 750;
      border: 1px solid rgba(177, 92, 255, .25);
      background: rgba(177, 92, 255, .14);
    }

    .badge.orange {
      color: #ffe2bf;
      border-color: rgba(255, 179, 92, .28);
      background: rgba(255, 179, 92, .12);
    }

    .badge.green {
      color: #c9fff1;
      border-color: rgba(126, 224, 195, .28);
      background: rgba(126, 224, 195, .11);
    }

    .section {
      padding: 92px 0;
      position: relative;
    }

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

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
      color: var(--orange);
      font-size: 13px;
      font-weight: 800;
    }

    .section-kicker::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--orange);
      box-shadow: 0 0 0 6px rgba(255, 179, 92, .12);
    }

    .section-title {
      font-size: clamp(28px, 4vw, 40px);
      line-height: 1.22;
      letter-spacing: -.03em;
      color: var(--text);
      font-weight: 850;
    }

    .section-desc {
      margin-top: 14px;
      color: var(--muted);
      font-size: 16px;
      max-width: 720px;
    }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 76px 0 62px;
      min-height: calc(100vh - var(--header-h));
      display: flex;
      align-items: center;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      z-index: -2;
      background:
        linear-gradient(90deg, rgba(18,16,24,.94) 0%, rgba(18,16,24,.78) 48%, rgba(18,16,24,.94) 100%),
        url("/assets/images/backpic/back-1.jpg") center/cover no-repeat;
      opacity: .82;
    }

    .hero::after {
      content: "";
      position: absolute;
      right: -160px;
      top: 8%;
      width: 460px;
      height: 460px;
      border-radius: 50%;
      background: rgba(177, 92, 255, .18);
      filter: blur(44px);
      z-index: -1;
    }

    .hero-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.02fr) minmax(360px, .78fr);
      gap: 56px;
      align-items: center;
    }

    .hero-copy {
      max-width: 760px;
    }

    .hero-label {
      margin-bottom: 18px;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 8px 12px;
      border-radius: 999px;
      color: #f1dcff;
      font-size: 13px;
      font-weight: 750;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.055);
    }

    .pulse-dot {
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 7px rgba(126, 224, 195, .12);
    }

    h1 {
      font-size: clamp(34px, 5.2vw, 58px);
      line-height: 1.08;
      letter-spacing: -.045em;
      color: var(--text);
      font-weight: 900;
      max-width: 760px;
    }

    .hero-subtitle {
      margin-top: 22px;
      color: var(--muted);
      font-size: clamp(16px, 1.5vw, 18px);
      max-width: 690px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 32px;
    }

    .hero-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 34px;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 38px;
      padding: 6px 13px;
      border-radius: 999px;
      color: var(--muted);
      font-size: 13px;
      font-weight: 650;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.045);
    }

    .hero-pill i {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--purple);
    }

    .hero-board {
      position: relative;
      min-height: 520px;
    }

    .feature-frame {
      position: absolute;
      inset: 26px 0 0 18px;
      overflow: hidden;
      border-radius: 34px;
      border: 1px solid rgba(255,255,255,.12);
      background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.035));
      box-shadow: var(--shadow);
    }

    .feature-frame img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: .56;
      filter: saturate(.9);
    }

    .feature-frame::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(18,16,24,.14), rgba(18,16,24,.92));
    }

    .preview-stack {
      position: absolute;
      inset: 0;
      display: grid;
      align-content: end;
      gap: 14px;
      padding: 26px;
    }

    .preview-card {
      position: relative;
      z-index: 2;
      padding: 18px;
      border-radius: 20px;
      border: 1px solid rgba(255,255,255,.12);
      background: rgba(19, 14, 27, .82);
      box-shadow: 0 16px 44px rgba(0,0,0,.28);
      backdrop-filter: blur(12px);
      transform: translateX(var(--offset, 0));
    }

    .preview-card:nth-child(2) {
      --offset: -24px;
      max-width: 86%;
    }

    .preview-card:nth-child(3) {
      --offset: 20px;
      max-width: 78%;
      justify-self: end;
    }

    .preview-card__top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 10px;
    }

    .preview-card h3 {
      font-size: 17px;
      line-height: 1.45;
      color: #fff;
    }

    .preview-card p {
      margin-top: 6px;
      color: var(--subtle);
      font-size: 13px;
    }

    .notice-strip {
      margin-top: -12px;
      position: relative;
      z-index: 3;
    }

    .notice-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      padding: 16px;
      border-radius: 26px;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(26, 20, 35, .82);
      box-shadow: var(--shadow);
      backdrop-filter: blur(16px);
    }

    .notice-item {
      display: flex;
      gap: 12px;
      padding: 16px;
      border-radius: 18px;
      background: rgba(255,255,255,.045);
      border: 1px solid rgba(255,255,255,.07);
    }

    .icon {
      flex: 0 0 auto;
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 15px;
      color: #fff;
      background: linear-gradient(135deg, rgba(177,92,255,.86), rgba(209,91,143,.72));
      box-shadow: 0 12px 28px rgba(177,92,255,.18);
      font-weight: 850;
    }

    .notice-item h3 {
      font-size: 15px;
      line-height: 1.35;
      margin-bottom: 3px;
    }

    .notice-item p {
      color: var(--subtle);
      font-size: 13px;
      line-height: 1.55;
    }

    .guide-wrap {
      display: grid;
      grid-template-columns: .76fr 1.24fr;
      gap: 30px;
      align-items: start;
    }

    .guide-panel {
      position: sticky;
      top: calc(var(--header-h) + 24px);
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255,255,255,.1);
      background:
        linear-gradient(180deg, rgba(177,92,255,.14), rgba(255,255,255,.04)),
        var(--panel);
      box-shadow: var(--shadow-soft);
    }

    .guide-panel img {
      margin-top: 22px;
      border-radius: 22px;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      border: 1px solid rgba(255,255,255,.1);
    }

    .guide-panel h2 {
      font-size: 28px;
      line-height: 1.24;
      letter-spacing: -.03em;
    }

    .guide-panel p {
      margin-top: 12px;
      color: var(--muted);
      font-size: 15px;
    }

    .timeline {
      position: relative;
      display: grid;
      gap: 16px;
    }

    .timeline::before {
      content: "";
      position: absolute;
      left: 29px;
      top: 18px;
      bottom: 18px;
      width: 1px;
      background: linear-gradient(180deg, rgba(177,92,255,.4), rgba(255,179,92,.22));
    }

    .step-card {
      position: relative;
      display: grid;
      grid-template-columns: 58px 1fr;
      gap: 18px;
      padding: 20px;
      border-radius: 22px;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.045);
      transition: transform .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
    }

    .step-card:hover {
      transform: translateY(-3px);
      border-color: rgba(177,92,255,.38);
      background: rgba(255,255,255,.065);
    }

    .step-num {
      position: relative;
      z-index: 2;
      width: 58px;
      height: 58px;
      display: grid;
      place-items: center;
      border-radius: 20px;
      color: #fff;
      font-weight: 850;
      background: linear-gradient(135deg, var(--purple), rgba(209,91,143,.86));
      box-shadow: 0 14px 32px rgba(177,92,255,.2);
    }

    .step-card h3 {
      font-size: 19px;
      margin-bottom: 5px;
    }

    .step-card p {
      color: var(--muted);
      font-size: 14px;
      max-width: 680px;
    }

    .bento-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr .85fr;
      grid-auto-rows: minmax(210px, auto);
      gap: 16px;
    }

    .bento-card {
      position: relative;
      overflow: hidden;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.045);
      transition: transform .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease), box-shadow .22s var(--ease);
    }

    .bento-card:hover {
      transform: translateY(-4px);
      border-color: rgba(177,92,255,.42);
      background: rgba(255,255,255,.065);
      box-shadow: var(--shadow-soft);
    }

    .bento-card.large {
      grid-row: span 2;
      min-height: 430px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      background: var(--panel);
    }

    .bento-card.large img {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: .58;
    }

    .bento-card.large::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(18,16,24,.18), rgba(18,16,24,.9));
    }

    .bento-content {
      position: relative;
      z-index: 2;
    }

    .bento-card h3 {
      margin-top: 16px;
      font-size: 22px;
      line-height: 1.32;
    }

    .bento-card p {
      margin-top: 9px;
      color: var(--muted);
      font-size: 14px;
    }

    .mini-icon {
      width: 46px;
      height: 46px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      color: #fff;
      font-weight: 900;
      background: rgba(177,92,255,.16);
      border: 1px solid rgba(177,92,255,.22);
      transition: transform .22s var(--ease);
    }

    .bento-card:hover .mini-icon {
      transform: translateY(-3px);
    }

    .news-section {
      background:
        linear-gradient(180deg, rgba(255,255,255,.018), rgba(255,255,255,.035)),
        rgba(0,0,0,.05);
    }

    .news-toolbar {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 26px;
    }

    .news-tabs {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .tab-chip {
      min-height: 36px;
      display: inline-flex;
      align-items: center;
      padding: 0 13px;
      border-radius: 999px;
      color: var(--muted);
      font-size: 13px;
      font-weight: 700;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.045);
    }

    .tab-chip.is-active,
    .tab-chip:hover {
      color: #fff;
      border-color: rgba(177,92,255,.38);
      background: rgba(177,92,255,.14);
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .news-card {
      position: relative;
      overflow: hidden;
      min-height: 210px;
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.045);
      transition: transform .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease), box-shadow .22s var(--ease);
    }

    .news-card:hover {
      transform: translateY(-4px);
      border-color: rgba(209,91,143,.42);
      background: rgba(255,255,255,.065);
      box-shadow: var(--shadow-soft);
    }

    .news-card--featured {
      grid-row: span 2;
      min-height: 436px;
      background:
        linear-gradient(180deg, rgba(18,16,24,.26), rgba(18,16,24,.88)),
        url("/assets/images/coverpic/cover-3.webp") center/cover no-repeat;
    }

    .news-card--featured::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 12% 8%, rgba(177,92,255,.18), transparent 34%);
      pointer-events: none;
    }

    .news-card__link {
      position: relative;
      z-index: 2;
      min-height: inherit;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 24px;
    }

    .news-meta {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 10px;
      color: var(--subtle);
      font-size: 13px;
      font-weight: 650;
    }

    .news-meta time::before {
      content: "·";
      margin-right: 10px;
      color: rgba(255,255,255,.28);
    }

    .news-card h3 {
      margin-top: 18px;
      color: #fff;
      font-size: clamp(19px, 2.2vw, 25px);
      line-height: 1.34;
      letter-spacing: -.02em;
    }

    .news-card p {
      margin-top: 10px;
      color: var(--muted);
      font-size: 14px;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .news-card--featured p {
      -webkit-line-clamp: 3;
      max-width: 560px;
    }

    .read-more {
      margin-top: 22px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #f2dfff;
      font-size: 14px;
      font-weight: 800;
    }

    .read-more::after {
      content: "→";
      transition: transform .2s var(--ease);
    }

    .news-card:hover .read-more::after {
      transform: translateX(4px);
    }

    .empty-state {
      grid-column: 1 / -1;
      min-height: 220px;
      display: grid;
      place-items: center;
      padding: 34px;
      text-align: center;
      border-radius: var(--radius-lg);
      border: 1px dashed rgba(177,92,255,.36);
      background: rgba(255,255,255,.045);
      color: var(--muted);
      font-weight: 700;
    }

    .proof-grid {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 18px;
      align-items: stretch;
    }

    .proof-card {
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255,255,255,.1);
      background: var(--panel);
      overflow: hidden;
      position: relative;
    }

    .proof-card.image {
      min-height: 360px;
      padding: 0;
    }

    .proof-card.image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: .74;
    }

    .proof-card.image::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(18,16,24,.12), rgba(18,16,24,.86));
    }

    .proof-caption {
      position: absolute;
      left: 24px;
      right: 24px;
      bottom: 24px;
      z-index: 2;
    }

    .proof-caption h3,
    .proof-card h3 {
      font-size: 24px;
      line-height: 1.28;
    }

    .proof-caption p,
    .proof-card p {
      margin-top: 10px;
      color: var(--muted);
      font-size: 15px;
    }

    .proof-list {
      margin-top: 22px;
      display: grid;
      gap: 13px;
    }

    .proof-list li {
      list-style: none;
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,.045);
      border: 1px solid rgba(255,255,255,.07);
      color: var(--muted);
      font-size: 14px;
    }

    .proof-list li::before {
      content: "✓";
      flex: 0 0 auto;
      width: 24px;
      height: 24px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #fff;
      background: rgba(126,224,195,.2);
      border: 1px solid rgba(126,224,195,.24);
      font-weight: 850;
      line-height: 1;
    }

    .faq-wrap {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 30px;
      align-items: start;
    }

    .faq-aside {
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255,255,255,.1);
      background:
        radial-gradient(circle at 20% 20%, rgba(209,91,143,.16), transparent 36%),
        rgba(255,255,255,.045);
    }

    .faq-aside h2 {
      font-size: 30px;
      line-height: 1.24;
      letter-spacing: -.03em;
    }

    .faq-aside p {
      margin-top: 12px;
      color: var(--muted);
      font-size: 15px;
    }

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

    .faq-item {
      border-radius: 20px;
      border: 1px solid rgba(255,255,255,.1);
      background: rgba(255,255,255,.045);
      overflow: hidden;
      transition: border-color .22s var(--ease), background .22s var(--ease);
    }

    .faq-item.is-open {
      border-color: rgba(177,92,255,.42);
      background: rgba(177,92,255,.075);
    }

    .faq-question {
      width: 100%;
      min-height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 18px 20px;
      text-align: left;
      color: var(--text);
      font-size: 16px;
      font-weight: 800;
    }

    .faq-question .plus {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #fff;
      background: rgba(255,255,255,.08);
      transition: transform .22s var(--ease), background .22s var(--ease);
    }

    .faq-item.is-open .plus {
      transform: rotate(45deg);
      background: rgba(177,92,255,.28);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height .28s var(--ease);
    }

    .faq-answer p {
      padding: 0 20px 20px;
      color: var(--muted);
      font-size: 14px;
    }

    .cta-card {
      position: relative;
      overflow: hidden;
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 26px;
      align-items: center;
      padding: clamp(28px, 5vw, 52px);
      border-radius: 34px;
      border: 1px solid rgba(255,255,255,.12);
      background:
        radial-gradient(circle at 10% 12%, rgba(177,92,255,.26), transparent 34%),
        radial-gradient(circle at 88% 80%, rgba(255,179,92,.14), transparent 32%),
        linear-gradient(135deg, rgba(32,24,44,.96), rgba(19,14,27,.96));
      box-shadow: var(--shadow);
    }

    .cta-card::after {
      content: "";
      position: absolute;
      right: -72px;
      top: -72px;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      border: 34px solid rgba(255,255,255,.045);
    }

    .cta-card h2 {
      font-size: clamp(28px, 4vw, 42px);
      line-height: 1.2;
      letter-spacing: -.035em;
    }

    .cta-card p {
      margin-top: 12px;
      color: var(--muted);
      max-width: 680px;
      font-size: 16px;
    }

    .cta-actions {
      display: flex;
      justify-content: flex-end;
      flex-wrap: wrap;
      gap: 12px;
      position: relative;
      z-index: 2;
    }

    .site-footer {
      border-top: 1px solid rgba(255,255,255,.09);
      background: rgba(8, 6, 12, .72);
      padding: 54px 0 28px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.3fr .8fr 1fr;
      gap: 34px;
      align-items: start;
    }

    .footer-brand p {
      margin-top: 16px;
      color: var(--subtle);
      font-size: 14px;
      max-width: 460px;
    }

    .footer-title {
      margin-bottom: 14px;
      color: var(--text);
      font-size: 15px;
      font-weight: 850;
    }

    .footer-links {
      display: grid;
      gap: 10px;
    }

    .footer-links a,
    .footer-note {
      color: var(--subtle);
      font-size: 14px;
    }

    .footer-links a:hover {
      color: var(--purple);
      transform: translateX(3px);
    }

    .copyright {
      margin-top: 36px;
      padding-top: 22px;
      border-top: 1px solid rgba(255,255,255,.08);
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      color: #766f83;
      font-size: 13px;
    }

    .back-top {
      color: var(--subtle);
    }

    .back-top:hover {
      color: var(--purple);
    }

    @media (max-width: 1024px) {
      .container {
        width: min(100% - 40px, var(--container));
      }

      .hero {
        min-height: auto;
        padding: 64px 0 56px;
      }

      .hero-layout,
      .guide-wrap,
      .faq-wrap,
      .proof-grid,
      .cta-card {
        grid-template-columns: 1fr;
      }

      .hero-board {
        min-height: 440px;
      }

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

      .guide-panel {
        position: relative;
        top: auto;
      }

      .bento-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .bento-card.large {
        grid-column: 1 / -1;
      }

      .cta-actions {
        justify-content: flex-start;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }

      .footer-brand {
        grid-column: 1 / -1;
      }
    }

    @media (max-width: 820px) {
      .site-header {
        height: 70px;
      }

      :root {
        --header-h: 70px;
      }

      .nav-menu {
        position: fixed;
        left: 20px;
        right: 20px;
        top: 82px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        border-radius: 22px;
        background: rgba(18, 14, 26, .96);
        box-shadow: var(--shadow);
      }

      .nav-menu.is-open {
        display: flex;
      }

      .nav-link {
        min-height: 48px;
        justify-content: center;
      }

      .header-actions .btn {
        display: none;
      }

      .menu-toggle {
        display: inline-grid;
        place-items: center;
      }

      .section {
        padding: 70px 0;
      }

      .hero-layout {
        gap: 34px;
      }

      .hero-board {
        min-height: 380px;
      }

      .feature-frame {
        inset: 0;
      }

      .preview-card:nth-child(2),
      .preview-card:nth-child(3) {
        max-width: 100%;
        justify-self: stretch;
        transform: none;
      }

      .news-toolbar {
        align-items: flex-start;
        flex-direction: column;
      }

      .news-grid {
        grid-template-columns: 1fr;
      }

      .news-card--featured {
        min-height: 330px;
        grid-row: auto;
      }
    }

    @media (max-width: 560px) {
      .container {
        width: min(100% - 32px, var(--container));
      }

      .brand-text span {
        display: none;
      }

      .brand-mark {
        width: 38px;
        height: 38px;
        border-radius: 13px;
      }

      h1 {
        font-size: 34px;
      }

      .hero-actions,
      .cta-actions {
        flex-direction: column;
        align-items: stretch;
      }

      .btn {
        width: 100%;
      }

      .notice-grid,
      .bento-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }

      .notice-strip {
        margin-top: 0;
      }

      .hero-board {
        min-height: 340px;
      }

      .preview-stack {
        padding: 16px;
      }

      .preview-card {
        padding: 15px;
      }

      .step-card {
        grid-template-columns: 48px 1fr;
        gap: 14px;
        padding: 16px;
      }

      .timeline::before {
        left: 24px;
      }

      .step-num {
        width: 48px;
        height: 48px;
        border-radius: 16px;
      }

      .copyright {
        flex-direction: column;
      }
    }

/* roulang page: article */
:root {
      --bg: #121018;
      --bg-deep: #0c0a11;
      --panel: #1a1423;
      --panel-2: #21182d;
      --panel-soft: rgba(255, 255, 255, .055);
      --text: #f7f2ff;
      --muted: #c9c2d6;
      --subtle: #8f879e;
      --line: rgba(214, 190, 255, .16);
      --line-strong: rgba(209, 91, 143, .42);
      --purple: #b15cff;
      --purple-2: #d15b8f;
      --orange: #ffb35c;
      --green: #7ee0c3;
      --shadow: 0 22px 70px rgba(0, 0, 0, .35);
      --shadow-soft: 0 14px 44px rgba(177, 92, 255, .16);
      --radius-lg: 28px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --container: 1200px;
      --header-h: 76px;
      --ease: cubic-bezier(.2, .8, .2, 1);
      color-scheme: dark;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: calc(var(--header-h) + 20px);
    }

    body {
      min-height: 100vh;
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      line-height: 1.75;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(177, 92, 255, .22), transparent 34%),
        radial-gradient(circle at 88% 18%, rgba(209, 91, 143, .18), transparent 30%),
        radial-gradient(circle at 52% 84%, rgba(255, 179, 92, .08), transparent 38%),
        linear-gradient(180deg, #15111d 0%, var(--bg) 46%, #0d0a12 100%);
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: -2;
      opacity: .36;
      background-image:
        linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
      background-size: 44px 44px;
      mask-image: radial-gradient(circle at center, #000 0%, transparent 78%);
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
    }

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

    button,
    input,
    textarea {
      font: inherit;
    }

    button {
      border: 0;
      cursor: pointer;
      color: inherit;
      background: none;
    }

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

    :focus-visible {
      outline: 3px solid rgba(177, 92, 255, .58);
      outline-offset: 3px;
      border-radius: 12px;
    }

    .container {
      width: min(100% - 48px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      height: var(--header-h);
      border-bottom: 1px solid rgba(255,255,255,.08);
      background: rgba(15, 12, 21, .78);
      backdrop-filter: blur(18px);
    }

    .nav-shell {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: max-content;
      font-weight: 800;
      letter-spacing: .02em;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 15px;
      background:
        radial-gradient(circle at 30% 24%, rgba(255,255,255,.28), transparent 28%),
        linear-gradient(135deg, var(--purple), var(--purple-2));
      box-shadow: 0 14px 34px rgba(177, 92, 255, .28);
      position: relative;
      overflow: hidden;
      flex: 0 0 auto;
    }

    .brand-mark::after {
      content: "";
      width: 0;
      height: 0;
      border-top: 8px solid transparent;
      border-bottom: 8px solid transparent;
      border-left: 12px solid #fff;
      margin-left: 3px;
      filter: drop-shadow(0 2px 6px rgba(0,0,0,.24));
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.12;
    }

    .brand-text strong {
      font-size: 18px;
      color: var(--text);
    }

    .brand-text span {
      font-size: 12px;
      font-weight: 600;
      color: var(--subtle);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 7px;
      border: 1px solid rgba(255,255,255,.08);
      border-radius: 999px;
      background: rgba(255,255,255,.045);
    }

    .nav-link {
      min-height: 40px;
      display: inline-flex;
      align-items: center;
      padding: 0 16px;
      border-radius: 999px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 650;
      white-space: nowrap;
    }

    .nav-link:hover,
    .nav-link.active {
      color: #fff;
      background: rgba(177, 92, 255, .16);
    }

    .header-actions {
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }

    .menu-toggle {
      display: none;
      width: 46px;
      height: 46px;
      border: 1px solid rgba(255,255,255,.12);
      border-radius: 15px;
      background: rgba(255,255,255,.06);
    }

    .menu-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      margin: 5px auto;
      border-radius: 999px;
      background: var(--text);
      transition: transform .22s var(--ease), opacity .22s var(--ease);
    }

    .menu-toggle.is-open span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    .menu-toggle.is-open span:nth-child(2) {
      opacity: 0;
    }

    .menu-toggle.is-open span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    .btn {
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 0 20px;
      border-radius: 999px;
      font-weight: 750;
      font-size: 14px;
      border: 1px solid transparent;
      white-space: nowrap;
      transition: transform .2s var(--ease), box-shadow .2s var(--ease), filter .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--purple), var(--purple-2));
      box-shadow: 0 14px 34px rgba(177, 92, 255, .26);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 44px rgba(209, 91, 143, .32);
      filter: brightness(1.06);
    }

    .btn-secondary {
      color: var(--text);
      border-color: rgba(177, 92, 255, .42);
      background: rgba(255,255,255,.045);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      border-color: rgba(209, 91, 143, .66);
      background: rgba(177, 92, 255, .14);
      box-shadow: var(--shadow-soft);
    }

    .badge-soft {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      min-height: 30px;
      padding: 4px 12px;
      border: 1px solid rgba(177, 92, 255, .28);
      border-radius: 999px;
      color: #eadcff;
      background: rgba(177, 92, 255, .12);
      font-size: 13px;
      font-weight: 700;
    }

    .badge-warm {
      border-color: rgba(255, 179, 92, .32);
      color: #ffe0bd;
      background: rgba(255, 179, 92, .12);
    }

    .site-main {
      position: relative;
    }

    .article-hero {
      position: relative;
      padding: 54px 0 34px;
      overflow: hidden;
    }

    .article-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      z-index: -1;
      background:
        linear-gradient(180deg, rgba(18, 16, 24, .42), rgba(18, 16, 24, .94)),
        url("/assets/images/backpic/back-2.webp") center/cover no-repeat;
      opacity: .64;
      mask-image: linear-gradient(#000 0%, #000 70%, transparent 100%);
    }

    .breadcrumb {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px;
      margin: 0 0 22px;
      color: var(--subtle);
      font-size: 14px;
    }

    .breadcrumb a {
      color: var(--muted);
      font-weight: 650;
    }

    .breadcrumb a:hover {
      color: var(--purple);
    }

    .breadcrumb .sep {
      color: rgba(201, 194, 214, .45);
    }

    .article-head {
      max-width: 900px;
    }

    .article-head h1 {
      margin: 18px 0 18px;
      color: var(--text);
      font-size: clamp(30px, 4vw, 48px);
      line-height: 1.16;
      letter-spacing: -.03em;
      font-weight: 850;
    }

    .article-summary {
      max-width: 820px;
      margin: 0;
      color: var(--muted);
      font-size: 17px;
      line-height: 1.85;
    }

    .article-meta {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 10px;
      margin-top: 22px;
      color: var(--subtle);
      font-size: 13px;
    }

    .meta-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 32px;
      padding: 5px 11px;
      border: 1px solid rgba(255,255,255,.10);
      border-radius: 999px;
      background: rgba(255,255,255,.055);
    }

    .article-layout {
      display: grid;
      grid-template-columns: minmax(0, 820px) minmax(280px, 320px);
      gap: 30px;
      align-items: start;
      padding: 30px 0 80px;
    }

    .article-card {
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      background:
        linear-gradient(180deg, rgba(255,255,255,.055), rgba(255,255,255,.028)),
        rgba(26, 20, 35, .88);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .cover-strip {
      position: relative;
      min-height: 230px;
      overflow: hidden;
      border-bottom: 1px solid rgba(255,255,255,.10);
    }

    .cover-strip img {
      width: 100%;
      height: 280px;
      object-fit: cover;
      filter: saturate(.92) contrast(1.02);
    }

    .cover-strip::after {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(90deg, rgba(12, 10, 17, .82), rgba(12, 10, 17, .18)),
        linear-gradient(180deg, transparent 48%, rgba(12, 10, 17, .78));
    }

    .cover-caption {
      position: absolute;
      left: 26px;
      right: 26px;
      bottom: 22px;
      z-index: 1;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      align-items: center;
      color: #fff;
    }

    .article-content {
      padding: 34px;
      color: var(--muted);
      font-size: 16px;
      line-height: 1.9;
    }

    .article-content h2,
    .article-content h3,
    .article-content h4 {
      color: var(--text);
      line-height: 1.35;
      font-weight: 800;
    }

    .article-content h2 {
      margin: 34px 0 14px;
      padding-top: 6px;
      font-size: 28px;
      letter-spacing: -.02em;
    }

    .article-content h3 {
      margin: 28px 0 12px;
      font-size: 22px;
    }

    .article-content h4 {
      margin: 22px 0 10px;
      font-size: 18px;
    }

    .article-content p {
      margin: 0 0 18px;
    }

    .article-content a {
      color: #e8d6ff;
      border-bottom: 1px solid rgba(177, 92, 255, .45);
      font-weight: 700;
    }

    .article-content a:hover {
      color: #fff;
      border-color: rgba(209, 91, 143, .8);
    }

    .article-content ul,
    .article-content ol {
      margin: 16px 0 22px;
      padding-left: 1.35em;
    }

    .article-content li {
      margin: 8px 0;
      padding-left: 4px;
    }

    .article-content blockquote {
      margin: 26px 0;
      padding: 18px 20px;
      border-left: 4px solid var(--purple);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      color: #eadcff;
      background: rgba(177, 92, 255, .105);
    }

    .article-content img {
      width: 100%;
      height: auto;
      margin: 24px 0 10px;
      border-radius: 16px;
      border: 1px solid rgba(255,255,255,.10);
      box-shadow: 0 16px 42px rgba(0,0,0,.25);
    }

    .article-content figure {
      margin: 26px 0;
    }

    .article-content figcaption {
      margin-top: 8px;
      color: var(--subtle);
      font-size: 13px;
      text-align: center;
    }

    .article-content hr {
      height: 1px;
      margin: 34px 0;
      border: 0;
      background: linear-gradient(90deg, transparent, rgba(214, 190, 255, .22), transparent);
    }

    .article-content table {
      width: 100%;
      margin: 24px 0;
      border-collapse: collapse;
      overflow: hidden;
      border-radius: 14px;
      background: rgba(255,255,255,.035);
    }

    .article-content th,
    .article-content td {
      padding: 13px 14px;
      border: 1px solid rgba(255,255,255,.10);
      vertical-align: top;
    }

    .article-content th {
      color: var(--text);
      background: rgba(177, 92, 255, .14);
      font-weight: 800;
    }

    .article-content .notice,
    .reading-notice {
      display: flex;
      gap: 12px;
      margin: 24px 0;
      padding: 16px 18px;
      border: 1px solid rgba(255, 179, 92, .28);
      border-radius: var(--radius-sm);
      color: #ffe8cd;
      background: rgba(255, 179, 92, .10);
    }

    .not-found {
      text-align: center;
      padding: 72px 24px;
    }

    .not-found .empty-icon {
      width: 68px;
      height: 68px;
      display: grid;
      place-items: center;
      margin: 0 auto 18px;
      border-radius: 22px;
      border: 1px solid rgba(177, 92, 255, .22);
      background: rgba(177, 92, 255, .12);
      font-size: 30px;
    }

    .not-found h2 {
      margin: 0 0 10px;
      color: var(--text);
      font-size: 28px;
    }

    .not-found p {
      max-width: 520px;
      margin: 0 auto 24px;
      color: var(--muted);
    }

    .article-after {
      padding: 0 34px 34px;
    }

    .return-box {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 20px;
      align-items: center;
      padding: 22px;
      border: 1px solid rgba(177, 92, 255, .22);
      border-radius: var(--radius-md);
      background:
        radial-gradient(circle at 16% 0%, rgba(177, 92, 255, .16), transparent 36%),
        rgba(255,255,255,.045);
    }

    .return-box h2 {
      margin: 0 0 6px;
      color: var(--text);
      font-size: 22px;
      font-weight: 850;
    }

    .return-box p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .side-stack {
      position: sticky;
      top: calc(var(--header-h) + 22px);
      display: grid;
      gap: 18px;
    }

    .side-card {
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: rgba(26, 20, 35, .82);
      box-shadow: 0 16px 46px rgba(0,0,0,.22);
      overflow: hidden;
    }

    .side-card-inner {
      padding: 20px;
    }

    .side-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin: 0 0 14px;
      color: var(--text);
      font-size: 17px;
      font-weight: 850;
    }

    .toc-list,
    .related-list {
      display: grid;
      gap: 10px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .toc-list a {
      display: flex;
      align-items: center;
      gap: 9px;
      padding: 10px 12px;
      border-radius: 13px;
      color: var(--muted);
      background: rgba(255,255,255,.035);
      border: 1px solid rgba(255,255,255,.06);
      font-size: 14px;
      font-weight: 650;
    }

    .toc-list a::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--purple);
      box-shadow: 0 0 0 4px rgba(177, 92, 255, .12);
      flex: 0 0 auto;
    }

    .toc-list a:hover {
      color: #fff;
      border-color: rgba(177, 92, 255, .36);
      background: rgba(177, 92, 255, .12);
      transform: translateX(2px);
    }

    .related-item {
      padding: 14px;
      border: 1px solid rgba(255,255,255,.08);
      border-radius: 16px;
      background: rgba(255,255,255,.035);
      transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
    }

    .related-item:hover {
      transform: translateY(-2px);
      border-color: rgba(177, 92, 255, .36);
      background: rgba(177, 92, 255, .10);
    }

    .related-item h3 {
      margin: 0 0 8px;
      color: var(--text);
      font-size: 15px;
      line-height: 1.55;
      font-weight: 800;
    }

    .related-item p {
      margin: 0 0 10px;
      color: var(--subtle);
      font-size: 13px;
      line-height: 1.65;
    }

    .related-meta {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      color: var(--subtle);
      font-size: 12px;
    }

    .side-visual {
      position: relative;
      min-height: 180px;
      display: flex;
      align-items: end;
      padding: 20px;
      overflow: hidden;
      background: var(--panel-2);
    }

    .side-visual img {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: .5;
    }

    .side-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(12,10,17,.12), rgba(12,10,17,.86));
    }

    .side-visual-content {
      position: relative;
      z-index: 1;
    }

    .side-visual-content h3 {
      margin: 10px 0 8px;
      color: #fff;
      font-size: 20px;
      font-weight: 850;
      line-height: 1.35;
    }

    .side-visual-content p {
      margin: 0 0 16px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.65;
    }

    .info-panel {
      margin-top: 26px;
      padding: 22px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(126, 224, 195, .22);
      background:
        radial-gradient(circle at 14% 12%, rgba(126, 224, 195, .12), transparent 32%),
        rgba(255,255,255,.04);
    }

    .info-panel h2 {
      margin: 0 0 10px;
      color: var(--text);
      font-size: 22px;
      font-weight: 850;
    }

    .info-panel p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.75;
    }

    .site-footer {
      background: rgba(8, 6, 12, .88);
      border-top: 1px solid rgba(255,255,255,.08);
      padding: 54px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.35fr) .72fr 1fr;
      gap: 34px;
      align-items: start;
    }

    .footer-brand p,
    .footer-note {
      margin: 16px 0 0;
      color: var(--subtle);
      font-size: 14px;
      line-height: 1.85;
    }

    .footer-title {
      margin: 0 0 14px;
      color: var(--text);
      font-size: 16px;
      font-weight: 850;
    }

    .footer-links {
      display: grid;
      gap: 10px;
    }

    .footer-links a {
      color: var(--muted);
      font-size: 14px;
      font-weight: 650;
    }

    .footer-links a:hover {
      color: var(--purple);
      transform: translateX(2px);
    }

    .copyright {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      align-items: center;
      margin-top: 36px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,.08);
      color: var(--subtle);
      font-size: 13px;
    }

    .back-top {
      color: var(--muted);
      font-weight: 750;
    }

    .back-top:hover {
      color: var(--purple);
    }

    @media (max-width: 1024px) {
      :root {
        --header-h: 70px;
      }

      .container {
        width: min(100% - 36px, var(--container));
      }

      .nav-menu {
        position: fixed;
        top: calc(var(--header-h) + 10px);
        left: 18px;
        right: 18px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 12px;
        border-radius: 22px;
        background: rgba(18, 16, 24, .96);
        box-shadow: var(--shadow);
      }

      .nav-menu.is-open {
        display: flex;
      }

      .nav-link {
        justify-content: center;
        min-height: 46px;
      }

      .menu-toggle {
        display: inline-block;
      }

      .header-actions .btn {
        display: none;
      }

      .article-layout {
        grid-template-columns: 1fr;
      }

      .side-stack {
        position: static;
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .side-card:last-child {
        grid-column: 1 / -1;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }

      .footer-brand {
        grid-column: 1 / -1;
      }
    }

    @media (max-width: 768px) {
      .container {
        width: min(100% - 32px, var(--container));
      }

      .brand-text span {
        display: none;
      }

      .article-hero {
        padding: 38px 0 24px;
      }

      .article-head h1 {
        font-size: 31px;
      }

      .article-summary {
        font-size: 15px;
      }

      .article-layout {
        padding: 22px 0 58px;
      }

      .article-content {
        padding: 24px 20px;
        font-size: 15px;
      }

      .article-content h2 {
        font-size: 24px;
      }

      .article-content h3 {
        font-size: 20px;
      }

      .cover-strip img {
        height: 220px;
      }

      .cover-caption {
        left: 18px;
        right: 18px;
        bottom: 18px;
      }

      .return-box {
        grid-template-columns: 1fr;
      }

      .article-after {
        padding: 0 20px 24px;
      }

      .side-stack {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .copyright {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 520px) {
      .container {
        width: min(100% - 28px, var(--container));
      }

      .site-header {
        height: 68px;
      }

      .brand-mark {
        width: 38px;
        height: 38px;
        border-radius: 13px;
      }

      .brand-text strong {
        font-size: 16px;
      }

      .article-head h1 {
        font-size: 28px;
      }

      .breadcrumb {
        font-size: 13px;
      }

      .btn {
        width: 100%;
      }

      .article-meta {
        align-items: stretch;
      }

      .meta-pill,
      .badge-soft {
        max-width: 100%;
      }

      .article-content table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
      }
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}