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

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

body {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--color-primary);
  color: var(--color-white);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

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

:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background-color: var(--color-gold);
  color: var(--color-primary);
}

/* ===== CSS Variables ===== */
:root {
  --color-primary: #0A1F44;
  --color-primary-deep: #081735;
  --color-primary-alt: #0D2A5B;
  --color-gold: #FFD700;
  --color-orange: #FF6B35;
  --color-light: #F5F7FA;
  --color-white: #FFFFFF;
  --color-slate: #A9B4C4;
  --color-border: #FFD70033;
  --color-success: #00C853;
  --color-warning: #FF9800;
  --shadow-soft: 0 12px 32px rgba(0, 0, 0, 0.25);
  --font-display: "Bebas Neue", "Arial Narrow", sans-serif;
  --font-chinese: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container: 1280px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --header-bg: rgba(10, 31, 68, 0.94);
  --transition: 0.25s ease;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 3000;
  background: var(--color-gold);
  color: var(--color-primary);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  transition: top 0.2s ease;
}

.skip-link:focus-visible {
  top: 1rem;
}

/* ===== Container / Layout ===== */
.container,
.page-shell {
  width: min(var(--container), 100% - 2rem);
  margin-inline: auto;
}

.section {
  padding-block: clamp(4rem, 10vw, 7rem);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.kicker::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--color-orange);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  text-decoration: none;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
  border: 1px solid transparent;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--color-gold);
  color: var(--color-primary);
  box-shadow: 0 6px 0 rgba(255, 215, 0, 0.2);
}

.btn--primary:hover {
  background: #ffdd33;
  transform: translateY(-2px);
  box-shadow: 0 10px 0 rgba(255, 215, 0, 0.18);
}

.btn--accent {
  background: var(--color-orange);
  color: var(--color-white);
  box-shadow: 0 6px 0 rgba(255, 107, 53, 0.3);
}

.btn--accent:hover {
  background: #ff7f47;
  transform: translateY(-2px);
  box-shadow: 0 10px 0 rgba(255, 107, 53, 0.22);
}

.btn--ghost {
  border-color: var(--color-border);
  color: var(--color-white);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-slate);
  padding-block: 1.25rem 0.5rem;
}

.breadcrumbs a {
  color: var(--color-gold);
  transition: color 0.2s ease;
}

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

.breadcrumbs span[aria-hidden] {
  color: var(--color-slate);
  margin-inline: 0.15rem;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--header-bg);
  backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

.site-header::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-orange) 60%, transparent 120%);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 3px;
  width: calc(var(--scroll-progress, 0) * 100%);
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange));
  z-index: 2;
  transform-origin: left center;
  transition: width 0.05s linear;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(var(--container), 100% - 2rem);
  margin-inline: auto;
  padding-block: 0.85rem;
}

/* ===== Brand ===== */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
}

.site-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--color-gold) 0%, #c79e00 70%);
  box-shadow: 0 0 0 3px var(--color-primary), 0 0 0 5px var(--color-gold), 0 6px 20px rgba(255, 215, 0, 0.35);
}

.site-brand__mark::before {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 1px dashed var(--color-orange);
  animation: spin 24s linear infinite;
}

.site-brand__core {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 4px var(--color-orange);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-brand__text strong {
  font-family: var(--font-chinese);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: 0.05em;
}

.site-brand__text small {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.24em;
  color: var(--color-gold);
  text-transform: uppercase;
}

/* ===== Live Chip ===== */
.live-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(120deg, var(--color-gold) 0%, #ffe14d 100%);
  color: var(--color-primary);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.82rem;
  line-height: 1.2;
  box-shadow: 0 4px 18px rgba(255, 215, 0, 0.3);
  white-space: nowrap;
  max-width: 40%;
  overflow: hidden;
}

.live-chip__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.35);
  animation: pulse 1.4s ease-in-out infinite;
  flex-shrink: 0;
}

.live-chip__label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  flex-shrink: 0;
}

.live-chip__match {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.live-chip__clock {
  font-weight: 800;
  font-size: 0.85rem;
  background: var(--color-primary);
  color: var(--color-gold);
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  flex-shrink: 0;
}

/* ===== Mobile Nav Toggle ===== */
.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--color-primary-alt);
  border: 1px solid var(--color-border);
  position: relative;
  flex-shrink: 0;
  transition: background 0.2s ease;
}

.nav-toggle:hover {
  background: var(--color-gold);
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 10px;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: background 0.2s ease, transform 0.3s ease;
}

.nav-toggle__bars {
  top: 22px;
}

.nav-toggle__bars::before {
  top: -7px;
}

.nav-toggle__bars::after {
  top: 7px;
}

.nav-toggle:hover .nav-toggle__bars,
.nav-toggle:hover .nav-toggle__bars::before,
.nav-toggle:hover .nav-toggle__bars::after {
  background: var(--color-primary);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-orange);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--color-orange);
}

/* ===== Site Nav ===== */
.site-nav {
  width: min(var(--container), 100% - 2rem);
  margin-inline: auto;
  padding-bottom: 0.35rem;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
  counter-reset: nav-index;
}

.site-nav__item {
  counter-increment: nav-index;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-family: var(--font-chinese);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-slate);
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.site-nav__link::before {
  content: counter(nav-index, decimal-leading-zero);
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--color-orange);
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.site-nav__link:hover {
  color: var(--color-white);
  background: var(--color-primary-alt);
  transform: translateY(-1px);
}

.site-nav__link[aria-current="page"] {
  background: var(--color-gold);
  color: var(--color-primary);
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(255, 215, 0, 0.3);
}

.site-nav__link[aria-current="page"]::before {
  color: var(--color-orange);
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  background: var(--color-primary-deep);
  border-top: 3px solid var(--color-gold);
  margin-top: auto;
  overflow: hidden;
}

.site-footer::before {
  content: "E-KAIYUN-FOCUS";
  position: absolute;
  right: -2%;
  bottom: 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(4rem, 14vw, 11rem);
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
  line-height: 1;
  user-select: none;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr 0.8fr;
  gap: 2.5rem;
  width: min(var(--container), 100% - 2rem);
  margin-inline: auto;
  padding-block: 3.5rem 2rem;
  position: relative;
  z-index: 1;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.site-brand--footer .site-brand__mark {
  width: 38px;
  height: 38px;
}

.site-brand--footer .site-brand__text strong {
  font-size: 1.1rem;
}

.site-footer__tagline {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-white);
  font-family: var(--font-chinese);
}

.site-footer__trust {
  font-size: 0.88rem;
  color: var(--color-slate);
  line-height: 1.7;
  border-left: 3px solid var(--color-orange);
  padding-left: 0.9rem;
}

.footer-heading {
  font-family: var(--font-chinese);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.site-footer__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--color-white);
  font-size: 0.95rem;
  transition: color 0.2s ease, transform 0.2s ease;
}

.site-footer__links a::before {
  content: "→";
  color: var(--color-orange);
  font-weight: 700;
  transform: translateX(0);
  transition: transform 0.2s ease;
}

.site-footer__links a:hover {
  color: var(--color-gold);
  transform: translateX(3px);
}

.site-footer__links a:hover::before {
  transform: translateX(2px);
}

.site-footer__contact p,
.site-footer__legal p {
  color: var(--color-slate);
  font-size: 0.92rem;
  line-height: 1.75;
  margin-bottom: 0.4rem;
  word-break: break-word;
}

.site-footer__contact p:last-child,
.site-footer__legal p:last-child {
  margin-bottom: 0;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.25rem 0;
  width: min(var(--container), 100% - 2rem);
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.site-footer__copyright,
.site-footer__icp {
  font-size: 0.8rem;
  color: var(--color-slate);
}

/* ===== Back to Top ===== */
.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 1500;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-gold);
  color: var(--color-primary);
  font-weight: 900;
  font-size: 1.4rem;
  line-height: 1;
  box-shadow: 0 8px 30px rgba(255, 215, 0, 0.4);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.to-top:hover {
  background: var(--color-orange);
  color: var(--color-white);
  transform: translateY(-4px) rotate(-6deg);
  box-shadow: 0 12px 36px rgba(255, 107, 53, 0.4);
}

/* ===== Generic Media Frame ===== */
.media-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-primary-alt);
  aspect-ratio: 4 / 3;
  box-shadow: var(--shadow-soft);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px var(--color-border);
  pointer-events: none;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.media-frame:hover img {
  transform: scale(1.04);
}

.media-frame--wide {
  aspect-ratio: 16 / 9;
}

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

/* ===== Chips ===== */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--color-primary-alt);
  color: var(--color-slate);
  border: 1px solid var(--color-border);
}

.chip--gold {
  background: var(--color-gold);
  color: var(--color-primary);
}

.chip--orange {
  background: var(--color-orange);
  color: var(--color-white);
}

/* ===== Bento Grid Base ===== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.bento-grid__slot {
  grid-column: span 12;
}

@media (min-width: 768px) {
  .bento-grid__slot--quarter {
    grid-column: span 6;
  }
  .bento-grid__slot--third {
    grid-column: span 6;
  }
  .bento-grid__slot--half {
    grid-column: span 6;
  }
  .bento-grid__slot--two-thirds {
    grid-column: span 8;
  }
  .bento-grid__slot--full {
    grid-column: span 12;
  }
}

@media (min-width: 1024px) {
  .bento-grid__slot--quarter {
    grid-column: span 3;
  }
  .bento-grid__slot--third {
    grid-column: span 4;
  }
  .bento-grid__slot--half {
    grid-column: span 6;
  }
}

/* ===== Reveal Animation ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  will-change: opacity, transform;
}

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

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.6);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(255, 107, 53, 0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Responsive: Tablet & Mobile ===== */
@media (max-width: 1023.98px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 767.98px) {
  .site-header__inner {
    padding-block: 0.6rem;
    flex-wrap: wrap;
  }

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

  .live-chip {
    max-width: none;
    margin-left: 0;
    order: 3;
    width: 100%;
    justify-content: center;
    border-radius: 10px;
    padding: 0.35rem 0.8rem;
  }

  .site-nav {
    display: none;
    width: 100%;
    padding-bottom: 0.8rem;
  }

  .site-nav[data-open="true"] {
    display: block;
    animation: navFadeIn 0.25s ease;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.3rem;
    padding: 0.75rem;
    background: var(--color-primary-alt);
    border-radius: 16px;
    border: 1px solid var(--color-border);
  }

  .site-nav__link {
    width: 100%;
    border-radius: 10px;
    font-size: 1.05rem;
    padding: 0.75rem 1rem;
    justify-content: center;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-bottom: 2.5rem;
  }

  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .to-top {
    width: 44px;
    height: 44px;
    right: 0.9rem;
    bottom: 0.9rem;
  }
}

@keyframes navFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
    will-change: auto;
  }

  .site-header::after {
    transition: none;
  }

  .site-brand__mark::before {
    animation: none;
  }
}

/* ===== Focus within interactive elements ===== */
a:hover,
button:hover {
  text-decoration: none;
}

.site-nav__link[aria-current="page"]:focus-visible,
.btn:focus-visible,
.nav-toggle:focus-visible,
.to-top:focus-visible {
  outline-color: var(--color-orange);
}

/* ===== Typographic helpers ===== */
.display-title {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.chinese-title {
  font-family: var(--font-chinese);
  font-weight: 300;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 1.12;
  color: var(--color-white);
}

.text-slate {
  color: var(--color-slate);
}

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

.text-orange {
  color: var(--color-orange);
}

/* ===== Simple Grid ===== */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2col {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid--2col {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .grid--3col {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Stack spacing ===== */
.stack {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.stack--lg {
  gap: 2.5rem;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

/* ===== Main content region ===== */
#main-content {
  min-height: 60vh;
  position: relative;
}

/* ===== Utility hide ===== */
[hidden],
.hidden {
  display: none !important;
}