/* ===== Reset & Variables ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-bg: #1B1226;
  --c-panel: #241832;
  --c-panel-hi: #2E1F3F;
  --c-gold: #F6C343;
  --c-gold-deep: #C99A2A;
  --c-red: #D5443C;
  --c-red-soft: #E0736C;
  --c-cyan: #2BC5B4;
  --c-text: #FCEFD2;
  --c-text-dim: #C9B8D4;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", monospace;

  --w-brand: 84px;
  --h-contact: 36px;
  --h-capsule: 56px;
  --max-width: 1280px;
  --container-pad: 32px;

  --radius-pill: 999px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;

  --t-fast: 200ms ease-out;
  --t-slow: 300ms ease-out;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
}

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

a {
  color: var(--c-cyan);
  text-decoration: none;
  transition: color var(--t-fast);
}

a:hover {
  color: var(--c-gold);
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: rgba(246, 195, 67, 0.25);
  color: var(--c-text);
}

/* ===== Utilities ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  background: var(--c-gold);
  color: var(--c-bg);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 20px;
  border-radius: 0 0 12px 0;
  transform: translateY(-100%);
  transition: transform var(--t-fast);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

#main-content {
  min-height: 60vh;
}

.page-main {
  padding-top: 0;
}

@media (min-width: 992px) {
  #main-content {
    margin-left: var(--w-brand);
  }
}

/* ===== Decorative Lantern ===== */
.deco-lantern {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 26px;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.14), transparent 22%, transparent 78%, rgba(0, 0, 0, 0.14)),
    radial-gradient(ellipse at 35% 30%, var(--c-red-soft), var(--c-red) 72%);
  border-radius: 10px 10px 8px 8px / 14px 14px 11px 11px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 11px;
  line-height: 1;
  color: var(--c-text);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  flex-shrink: 0;
}

.deco-lantern::before,
.deco-lantern::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 4px;
  z-index: 1;
}

.deco-lantern::before {
  top: -4px;
  background: linear-gradient(to bottom, var(--c-gold), var(--c-gold-deep));
  border-radius: 2px 2px 1px 1px;
}

.deco-lantern::after {
  bottom: -4px;
  background: linear-gradient(to bottom, var(--c-gold-deep), var(--c-gold));
  border-radius: 1px 1px 2px 2px;
}

/* ===== Header ===== */
.site-header {
  position: relative;
  z-index: 500;
}

.site-header::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 30% 22%, rgba(246, 195, 67, 0.22), rgba(43, 197, 180, 0.05) 48%, transparent 70%);
  pointer-events: none;
  z-index: 4000;
  animation: gold-glow 1.2s ease-out forwards;
}

@keyframes gold-glow {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

/* --- Contact Bar --- */
.contact-bar {
  position: relative;
  z-index: 5;
  background: var(--c-panel);
  border-bottom: 1px solid rgba(246, 195, 67, 0.08);
}

.contact-bar__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 6px var(--container-pad);
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--c-text-dim);
}

.contact-bar__item + .contact-bar__item {
  border-left: 1px solid rgba(246, 195, 67, 0.2);
  padding-left: 20px;
  margin-left: 20px;
}

@media (max-width: 575px) {
  .contact-bar__item--phone {
    display: none;
  }

  .contact-bar__inner {
    justify-content: center;
  }
}

/* --- Brand Track --- */
.brand-track {
  position: relative;
  z-index: 100;
  background: linear-gradient(135deg, #171020, var(--c-panel));
  border-bottom: 1px solid rgba(246, 195, 67, 0.12);
}

.brand-track__link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  height: 56px;
  color: var(--c-text);
  text-decoration: none;
  padding-inline: 12px;
  transition: color var(--t-fast);
}

.brand-track__link:hover {
  color: var(--c-gold);
}

.brand-track__top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-track__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.brand-track__rule,
.brand-track__meta {
  display: none;
}

@media (min-width: 992px) {
  .brand-track {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--w-brand);
    height: 100vh;
    border-bottom: none;
    border-right: 1px solid rgba(246, 195, 67, 0.1);
    background:
      radial-gradient(circle at 50% 30%, rgba(246, 195, 67, 0.08), transparent 40%),
      linear-gradient(180deg, #171020, var(--c-panel) 70%);
  }

  .brand-track__link {
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    height: 100%;
    padding: 28px 8px 24px;
    gap: 18px;
  }

  .brand-track__top {
    flex-direction: column;
    align-items: center;
    gap: 14px;
  }

  .brand-track__name {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 14px;
    letter-spacing: 0.2em;
    white-space: normal;
  }

  .brand-track__rule {
    display: block;
    width: 1px;
    height: 36px;
    background: linear-gradient(to bottom, transparent, var(--c-gold-deep), transparent);
  }

  .brand-track__meta {
    display: block;
    margin-top: auto;
  }

  .brand-track__version {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--c-gold);
    border: 1px solid var(--c-gold-deep);
    border-radius: var(--radius-pill);
    padding: 3px 9px;
    background: rgba(246, 195, 67, 0.06);
  }
}

/* --- Nav Capsule --- */
.nav-capsule {
  position: relative;
  z-index: 200;
  background: var(--c-panel);
}

.nav-capsule__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  border-bottom: 1px solid rgba(246, 195, 67, 0.08);
}

.nav-capsule__label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-dim);
  letter-spacing: 0.06em;
}

.nav-capsule__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--c-text);
  text-decoration: none;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
}

.nav-capsule__nav {
  max-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: row;
  gap: 8px;
  padding-inline: 16px;
  transition: max-height var(--t-slow);
}

.nav-capsule__nav[data-open="true"] {
  max-height: 400px;
  padding-block: 12px;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: var(--c-panel-hi);
  color: var(--c-text-dim);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  text-decoration: none;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}

.nav-item:hover {
  background: rgba(246, 195, 67, 0.1);
  color: var(--c-gold);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.nav-item[aria-current="page"] {
  background: rgba(246, 195, 67, 0.15);
  color: var(--c-gold);
  font-weight: 700;
}

.nav-item--solutions {
  position: relative;
  border: 1px solid var(--c-gold-deep);
  background: rgba(246, 195, 67, 0.06);
}

.nav-badge {
  position: absolute;
  top: -9px;
  right: -12px;
  background: var(--c-red);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  padding: 3px 7px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  letter-spacing: 0.03em;
  box-shadow: 0 2px 8px rgba(213, 68, 60, 0.35);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid rgba(246, 195, 67, 0.28);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.nav-toggle:hover {
  border-color: var(--c-gold);
  background: rgba(246, 195, 67, 0.06);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-gold);
  border-radius: 2px;
  transition: background var(--t-fast);
}

/* --- Desktop Nav Capsule --- */
@media (min-width: 992px) {
  .nav-capsule {
    position: fixed;
    top: 12px;
    left: calc(var(--w-brand) + 24px);
    width: fit-content;
    max-width: calc(100vw - var(--w-brand) - 48px);
    display: flex;
    align-items: center;
    gap: 0;
    background: rgba(30, 19, 42, 0.94);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border: 1px solid rgba(246, 195, 67, 0.22);
    border-radius: var(--radius-pill);
    padding: 8px 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
    transition: box-shadow var(--t-fast), border-color var(--t-fast);
  }

  .nav-capsule:hover {
    border-color: rgba(246, 195, 67, 0.4);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.5), 0 0 24px rgba(246, 195, 67, 0.08);
  }

  .nav-capsule__head {
    display: none;
  }

  .nav-capsule__nav {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    max-height: none;
    overflow: visible;
    padding: 0;
  }

  .nav-capsule__nav[data-open="true"] {
    max-height: none;
    padding: 0;
  }

  .nav-item {
    background: transparent;
    padding: 6px 12px;
    font-size: 14px;
    border-radius: var(--radius-pill);
  }

  .nav-item:hover {
    background: rgba(246, 195, 67, 0.1);
  }

  .nav-item--solutions {
    background: rgba(246, 195, 67, 0.06);
  }

  /* 桌面隐藏品牌简化条 */
  .nav-capsule__label {
    display: none;
  }
}

@media (max-width: 991px) {
  .nav-capsule__nav::-webkit-scrollbar {
    display: none;
  }

  .nav-capsule__nav {
    -ms-overflow-style: none;
    scrollbar-width: none;
  }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--c-panel);
  position: relative;
  z-index: 50;
  border-top: 1px solid rgba(246, 195, 67, 0.08);
}

@media (min-width: 992px) {
  .site-footer {
    margin-left: var(--w-brand);
  }
}

.site-footer__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 56px var(--container-pad) 32px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.6fr 1fr 1.2fr;
    gap: 48px;
  }
}

.site-footer__brand-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.site-footer__brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 800;
  color: var(--c-text);
  letter-spacing: 0.04em;
}

.site-footer__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-dim);
  max-width: 34em;
  margin-bottom: 16px;
}

.site-footer__trust {
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-text-dim);
  opacity: 0.7;
  max-width: 36em;
  border-left: 2px solid var(--c-gold-deep);
  padding-left: 12px;
}

.site-footer__title {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 18px;
}

.site-footer__links,
.site-footer__contact-list {
  display: grid;
  gap: 10px;
}

.site-footer__links a {
  color: var(--c-text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.site-footer__links a:hover {
  color: var(--c-gold);
  padding-left: 4px;
}

.site-footer__contact-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(246, 195, 67, 0.08);
}

.site-footer__contact-list li:last-child {
  border-bottom: none;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-gold-deep);
}

.site-footer__contact-value {
  color: var(--c-text);
  font-size: 14px;
  word-break: break-all;
}

.site-footer__bottom {
  border-top: 1px solid rgba(246, 195, 67, 0.15);
  padding: 18px var(--container-pad);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--c-text-dim);
  text-align: center;
}

@media (min-width: 768px) {
  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    max-width: var(--max-width);
    margin-inline: auto;
  }
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--c-gold), var(--c-gold-deep));
  border: 2px solid rgba(252, 239, 210, 0.55);
  color: var(--c-bg);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--t-slow), transform var(--t-slow), box-shadow var(--t-slow), visibility var(--t-slow);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  z-index: 900;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: 0 6px 28px rgba(246, 195, 67, 0.45);
  transform: translateY(-3px);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 26px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}

.btn--gold {
  background: var(--c-gold);
  color: var(--c-bg);
  border-color: var(--c-gold);
}

.btn--gold:hover {
  background: var(--c-gold-deep);
  border-color: var(--c-gold-deep);
  color: var(--c-bg);
  box-shadow: 0 4px 20px rgba(246, 195, 67, 0.25);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--c-gold);
  border-color: var(--c-gold-deep);
}

.btn--outline:hover {
  border-color: var(--c-gold);
  background: rgba(246, 195, 67, 0.08);
  color: var(--c-gold);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--c-text-dim);
  padding-block: 16px;
}

.breadcrumb__item {
  color: var(--c-cyan);
  text-decoration: none;
  transition: color var(--t-fast);
}

.breadcrumb__item:hover {
  color: var(--c-gold);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--c-text-dim);
  cursor: default;
}

.breadcrumb__sep {
  color: var(--c-gold-deep);
}

/* ===== Section Head ===== */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 32px;
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-gold-deep);
  letter-spacing: 0.08em;
}

.section-head__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--c-text);
  margin: 0;
}

.section-head__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-dim);
}

/* ===== Card ===== */
.card {
  background: var(--c-panel);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: background var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}

.card:hover {
  background: var(--c-panel-hi);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.28);
}

/* ===== Image Frame ===== */
.img-frame {
  position: relative;
  background: linear-gradient(135deg, var(--c-panel), var(--c-panel-hi));
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.img-frame::before {
  content: "图";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--c-text-dim);
  opacity: 0.35;
}

.img-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.img-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.img-frame--1x1 {
  aspect-ratio: 1 / 1;
}

.img-frame img {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Grid ===== */
.grid-8 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

@media (min-width: 768px) {
  .grid-8 {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 992px) {
  .grid-8 {
    grid-template-columns: repeat(8, 1fr);
  }
}

/* ===== Background Decor ===== */
.bg-decorated {
  background-image:
    radial-gradient(circle at 82% 18%, rgba(246, 195, 67, 0.07), transparent 32%),
    radial-gradient(circle at 12% 70%, rgba(213, 68, 60, 0.04), transparent 26%),
    radial-gradient(circle at 60% 90%, rgba(43, 197, 180, 0.05), transparent 24%);
}

@media (min-width: 768px) {
  .bg-ornament-coins {
    background-image:
      radial-gradient(circle at 90% 30%, rgba(246, 195, 67, 0.1) 0 1px, transparent 2px),
      radial-gradient(circle at 85% 32%, rgba(246, 195, 67, 0.08) 0 1px, transparent 2px),
      radial-gradient(circle at 92% 35%, rgba(246, 195, 67, 0.06) 0 1px, transparent 2px),
      radial-gradient(circle at 25% 85%, rgba(201, 154, 42, 0.09) 0 2px, transparent 3px);
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .site-header::before {
    display: none;
  }

  .back-to-top {
    transition: none;
  }
}