/* =========================================================
   /assets/site.css
   站点级共享样式：奔驰宝马娱乐
   设计语言：深蓝×金色×红色，赛博朋克与复古赌场结合
   ========================================================= */

/* ---------- CSS Variables ---------- */
:root {
  --color-deep-blue: #0A1A2F;
  --color-gold: #C9A227;
  --color-red: #E23B3B;
  --color-cream: #F7F3E8;
  --color-ink: #1A1512;
  --color-steel-blue: #2E4A6B;
  --color-light-gold: #DECB8A;
  --color-dark-gold: #8F6F1F;
  --color-off-white: #FDFCF8;
  --color-danger-red: #B22222;

  --font-heading: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-accent: "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;

  --container-xl: 1280px;
  --container-lg: 1080px;
  --container-md: 760px;
  --container-sm: 580px;

  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 6rem;
  --space-16: 8rem;

  --transition-speed: .25s;
  --shadow-gold: 0 0 14px rgba(201, 162, 39, .45);
}

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

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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--color-cream);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
}

main,
#main-content {
  display: block;
  flex: 1 0 auto;
}

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

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

a {
  color: var(--color-steel-blue);
  text-decoration: none;
  transition: color var(--transition-speed) ease, background var(--transition-speed) ease;
}

a:hover {
  color: var(--color-deep-blue);
  text-decoration: underline;
}

ul,
ol {
  list-style: none;
}

:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 3px;
}

/* ---------- Basic Typography ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-deep-blue);
  line-height: 1.25;
  letter-spacing: .02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.9rem, 4vw, 3.4rem);
}

h2 {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
}

h3 {
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
}

p {
  margin-bottom: var(--space-4);
  text-wrap: pretty;
}

/* ---------- Layout & Container ---------- */
.container-xl {
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container-lg {
  max-width: var(--container-lg);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container-md {
  max-width: var(--container-md);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container-sm {
  max-width: var(--container-sm);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-10);
}

.section--tight {
  padding-block: var(--space-6);
}

.section--dark {
  background: var(--color-deep-blue);
  color: var(--color-cream);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-cream);
}

.section--dark a,
.card--dark a,
.site-footer a {
  color: var(--color-gold);
}

.section--gray {
  background: var(--color-off-white);
  border-block: 1px solid rgba(46, 74, 107, .25);
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: var(--space-6);
}

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

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.gap-xl {
  gap: var(--space-10);
}

.gap-lg {
  gap: var(--space-8);
}

.gap-0 {
  gap: 0;
}

@media (max-width: 980px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border: 1px solid var(--color-gold);
  border-radius: 0;
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-family: var(--font-body);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-align: center;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 2px 0 var(--color-dark-gold);
  transition: background var(--transition-speed) ease, color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) ease;
}

.btn:hover {
  background: var(--color-light-gold);
  border-color: var(--color-light-gold);
  color: var(--color-deep-blue);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

.btn--ghost {
  background: transparent;
  color: var(--color-gold);
  box-shadow: none;
}

.btn--ghost:hover {
  background: rgba(201, 162, 39, .12);
  color: var(--color-gold);
}

.btn--danger {
  border-color: var(--color-red);
  background: var(--color-red);
  color: #FFFFFF;
  box-shadow: 0 2px 0 var(--color-danger-red);
}

.btn--danger:hover {
  border-color: var(--color-danger-red);
  background: var(--color-danger-red);
  color: #FFFFFF;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  padding: var(--space-4) 0;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  font-size: .82rem;
  color: var(--color-steel-blue);
}

.breadcrumbs li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--color-gold);
  font-family: var(--font-accent);
}

.breadcrumbs a {
  color: var(--color-gold);
}

.breadcrumbs a:hover {
  color: var(--color-red);
  text-decoration: underline;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 600;
  text-decoration: none;
}

/* ---------- Media / Image Placeholder ---------- */
.img-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-steel-blue);
  border: 1px solid rgba(201, 162, 39, .4);
}

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

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

.img-frame--wide {
  aspect-ratio: 21 / 9;
}

.img-frame::before {
  content: "";
  position: absolute;
  inset: 12px;
  z-index: 1;
  border: 1px solid rgba(201, 162, 39, .3);
  pointer-events: none;
}

.img-frame img,
.img-frame .img-inner {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Cards ---------- */
.card {
  position: relative;
  background: var(--color-off-white);
  border: 1px solid rgba(46, 74, 107, .3);
  border-top: 3px solid var(--color-gold);
  padding: var(--space-6);
}

.card--dark {
  background: var(--color-deep-blue);
  color: var(--color-cream);
  border-color: rgba(201, 162, 39, .3);
  border-top-color: var(--color-red);
}

.card--dark h1,
.card--dark h2,
.card--dark h3 {
  color: var(--color-cream);
}

.card--red {
  border-top-color: var(--color-red);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: var(--space-3);
}

.card__text {
  color: var(--color-steel-blue);
  font-size: .92rem;
}

.card--dark .card__text {
  color: rgba(247, 243, 232, .75);
}

/* ---------- Eyebrow / Tag / Stat / Callout / Tilt ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-3);
  font-family: var(--font-accent);
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--color-red);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-gold);
  flex-shrink: 0;
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--color-gold);
  background: transparent;
  color: var(--color-gold);
  font-family: var(--font-accent);
  font-size: .78rem;
  letter-spacing: .08em;
  white-space: nowrap;
}

.tag--red {
  border-color: var(--color-red);
  color: var(--color-red);
}

.stat {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.1;
  color: var(--color-deep-blue);
  letter-spacing: .02em;
}

.stat--gold {
  color: var(--color-gold);
}

.callout {
  padding: var(--space-5) var(--space-6);
  background: var(--color-off-white);
  border-left: 4px solid var(--color-gold);
  color: var(--color-ink);
}

.callout--red {
  border-left-color: var(--color-red);
}

.tilt-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  transform: skewX(-12deg);
}

.tilt-badge > * {
  display: inline-block;
  transform: skewX(12deg);
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: relative;
  z-index: 1000;
  background: var(--color-deep-blue);
  color: var(--color-cream);
  border-bottom: 1px solid rgba(201, 162, 39, .3);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  z-index: 2;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-red) 32%, var(--color-deep-blue) 32% 100%);
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 32%;
  height: 1px;
  background: linear-gradient(90deg, var(--color-red), transparent);
}

.skip-link {
  position: fixed;
  top: -70px;
  left: 16px;
  z-index: 2000;
  padding: 10px 16px;
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-weight: 700;
  border-radius: 2px;
  transition: top var(--transition-speed) ease;
}

.skip-link:focus-visible {
  top: 12px;
  text-decoration: none;
}

.header-topbar {
  background: linear-gradient(180deg, rgba(201, 162, 39, .1), rgba(201, 162, 39, .02));
}

.header-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: var(--space-5) var(--space-6);
}

.header-brand {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-logo:hover {
  text-decoration: none;
}

.logo-wheel {
  position: relative;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-gold);
  border-radius: 50%;
  background: var(--color-gold);
  background: radial-gradient(circle, var(--color-deep-blue) 0 12%, transparent 13%),
              repeating-conic-gradient(from 0deg, var(--color-gold) 0deg 30deg, var(--color-light-gold) 30deg 60deg, var(--color-dark-gold) 60deg 90deg);
  box-shadow: var(--shadow-gold);
  transition: transform var(--transition-speed) ease;
}

.logo-wheel::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  background: var(--color-deep-blue);
  border: 1px solid rgba(201, 162, 39, .55);
}

.logo-wheel::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  z-index: 2;
  width: 6px;
  height: 6px;
  background: var(--color-red);
  border-radius: 50%;
  transform: translateX(-50%);
}

.brand-logo:hover .logo-wheel {
  transform: rotate(15deg);
}

.logo-wheel--small {
  width: 34px;
  height: 34px;
  border-width: 1px;
}

.logo-wheel--small::after {
  inset: 9px;
}

.logo-wheel--small::before {
  top: 4px;
  width: 4px;
  height: 4px;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--color-cream);
  letter-spacing: .06em;
}

.brand-logo:hover .brand-title {
  color: var(--color-light-gold);
}

.brand-slogan {
  display: inline-block;
  padding: 4px 12px 4px 14px;
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  white-space: nowrap;
  transform: skewX(-14deg);
  box-shadow: 0 2px 0 var(--color-dark-gold);
}

.brand-slogan span {
  display: inline-block;
  transform: skewX(14deg);
}

.header-aux {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.header-hotline {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.4;
  text-align: right;
}

.hotline-label {
  font-family: var(--font-accent);
  font-size: .7rem;
  color: var(--color-red);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.hotline-value {
  font-family: var(--font-accent);
  font-size: 1rem;
  color: var(--color-gold);
  font-weight: 700;
  letter-spacing: .08em;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-gold);
  cursor: pointer;
  transition: border-color var(--transition-speed) ease;
}

.nav-toggle:hover {
  border-color: var(--color-red);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-gold);
  transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease, background var(--transition-speed) ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-red);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--color-red);
}

/* ---------- Navigation ---------- */
.header-nav-wrap {
  border-top: 1px solid rgba(201, 162, 39, .25);
  background: rgba(10, 26, 47, .96);
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1px;
}

.site-nav a {
  position: relative;
  display: block;
  padding: 14px 22px;
  color: var(--color-cream);
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .06em;
  text-decoration: none;
  transition: color var(--transition-speed) ease, background var(--transition-speed) ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-speed) ease;
}

.site-nav a:hover {
  color: var(--color-gold);
  background: rgba(201, 162, 39, .1);
  text-decoration: none;
}

.site-nav a:focus-visible {
  color: var(--color-gold);
}

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

.site-nav a[aria-current="page"] {
  color: var(--color-gold);
  background: linear-gradient(180deg, transparent, rgba(201, 162, 39, .12));
}

.site-nav a[aria-current="page"]::after {
  height: 3px;
  background: var(--color-red);
  transform: scaleX(1);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-red) 80%);
  box-shadow: 0 0 8px rgba(226, 59, 59, .6);
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: var(--space-12);
  overflow: hidden;
  background: var(--color-deep-blue);
  color: var(--color-cream);
  border-top: 2px solid var(--color-gold);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 70%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-red), var(--color-gold) 45%, transparent);
}

.site-footer::after {
  content: "奔驰宝马";
  position: absolute;
  right: -30px;
  bottom: -20px;
  z-index: 0;
  font-family: var(--font-heading);
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  color: rgba(201, 162, 39, .07);
  transform: rotate(-12deg);
  pointer-events: none;
  white-space: nowrap;
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: var(--space-10) var(--space-5) var(--space-5);
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: var(--space-10);
}

.footer-brand-col,
.footer-links-col,
.footer-contact-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo-mark {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: .12em;
  color: var(--color-gold);
}

.footer-desc {
  max-width: 34em;
  color: rgba(247, 243, 232, .72);
  font-size: .9rem;
  line-height: 1.7;
}

.footer-icp {
  font-family: var(--font-accent);
  font-size: .8rem;
  color: var(--color-steel-blue);
}

.footer-icp a {
  color: var(--color-light-gold);
}

.footer-title {
  margin-bottom: var(--space-2);
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(201, 162, 39, .3);
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: .16em;
  color: var(--color-gold);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-cream);
  font-size: .9rem;
}

.footer-links a::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--color-red);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.footer-links a:hover {
  color: var(--color-gold);
  text-decoration: none;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-contact-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .88rem;
  line-height: 1.6;
}

.contact-term {
  flex-shrink: 0;
  min-width: 42px;
  font-family: var(--font-accent);
  font-size: .8rem;
  color: var(--color-gold);
}

.contact-detail {
  color: var(--color-cream);
  word-break: break-all;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(201, 162, 39, .25);
  font-size: .82rem;
  color: var(--color-steel-blue);
}

.footer-bottom a {
  color: var(--color-light-gold);
}

.footer-bottom a:hover {
  color: var(--color-gold);
}

/* =========================================================
   Reveal on scroll & Reduced motion
   ========================================================= */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .55s ease, transform .55s ease;
  transition-delay: var(--reveal-delay, 0s);
}

.js-enabled [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

.js-enabled [data-reveal][data-reveal-delay="1"] {
  transition-delay: .08s;
}

.js-enabled [data-reveal][data-reveal-delay="2"] {
  transition-delay: .16s;
}

.js-enabled [data-reveal][data-reveal-delay="3"] {
  transition-delay: .24s;
}

.js-enabled [data-reveal][data-reveal-delay="4"] {
  transition-delay: .32s;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .header-nav-wrap {
    display: none;
    width: 100%;
  }

  .header-nav-wrap[data-open] {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav li {
    border-bottom: 1px solid rgba(201, 162, 39, .25);
  }

  .site-nav a {
    padding: 14px 22px;
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav a[aria-current="page"] {
    border-left: 3px solid var(--color-red);
    padding-left: 19px;
    background: rgba(201, 162, 39, .14);
  }

  .header-topbar-inner {
    padding-block: var(--space-3);
  }
}

@media (max-width: 680px) {
  .header-hotline {
    display: none;
  }

  .brand-title {
    font-size: .92rem;
  }

  .brand-slogan {
    font-size: .68rem;
    letter-spacing: .08em;
  }

  .logo-wheel {
    width: 40px;
    height: 40px;
  }

  .logo-wheel::after {
    inset: 10px;
  }

  .logo-wheel::before {
    top: 5px;
  }

  .header-topbar-inner {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .header-brand {
    flex: 1;
  }
}

@media (max-width: 640px) {
  .footer-cols {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-6);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .js-enabled [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .js-enabled [data-reveal][data-reveal-delay="1"],
  .js-enabled [data-reveal][data-reveal-delay="2"],
  .js-enabled [data-reveal][data-reveal-delay="3"],
  .js-enabled [data-reveal][data-reveal-delay="4"] {
    transition-delay: 0s;
  }

  .brand-logo:hover .logo-wheel {
    transform: none;
  }
}