/* =========================================================
   凤凰竞界 · 全站共享样式
   File: /assets/site.css
   ========================================================= */

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

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

main {
  display: block;
}

body {
  font-family: var(--font-body);
  background-color: var(--clr-ink);
  background-image:
    radial-gradient(ellipse 55% 35% at 80% 0%, rgba(212, 175, 55, 0.06), transparent 70%),
    radial-gradient(ellipse 40% 30% at 12% 92%, rgba(255, 107, 53, 0.05), transparent 70%);
  background-repeat: no-repeat;
  color: var(--clr-light);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: var(--clr-gold);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
a:hover {
  color: var(--clr-orange);
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--clr-light);
  line-height: 1.25;
  font-weight: 700;
  margin-bottom: 0.6em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

p {
  color: var(--clr-light);
  margin-bottom: 1em;
  max-width: 65ch;
}

/* ---------- Variables ---------- */
:root {
  --clr-ink: #0B1B2B;
  --clr-charcoal: #111827;
  --clr-navy: #0E1D2F;
  --clr-gold: #D4AF37;
  --clr-orange: #FF6B35;
  --clr-light: #F3F4F6;
  --clr-gray: #9CA3AF;
  --clr-green: #22C55E;
  --clr-red: #EF4444;
  --clr-slate: #1F2937;

  --font-heading: "Playfair Display", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --shell-max: 1240px;
  --shell-gap: clamp(20px, 4vw, 48px);
  --track-w: 46px;

  --dur: 0.35s;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-panel: 0 24px 60px rgba(0, 0, 0, 0.5);
  --line-gold: rgba(212, 175, 55, 0.22);
  --line-light: rgba(243, 244, 246, 0.07);
}

/* ---------- Focus & Reduced Motion ---------- */
:focus:not(:focus-visible) {
  outline: none;
}

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

@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;
  }
  .status-dot,
  .track-dot {
    animation: none !important;
  }
}

/* ---------- 桌面端为品牌轨道留出位置 ---------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--track-w);
  }
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 16px;
  z-index: 2000;
  display: inline-block;
  padding: 10px 22px;
  background: var(--clr-gold);
  color: var(--clr-ink);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 0 0 6px 6px;
  transform: translateY(-120%);
  transition: transform 0.3s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--clr-ink);
}

@media (min-width: 1024px) {
  .skip-link {
    left: calc(var(--track-w) + 16px);
  }
}

/* ---------- 品牌轨道 ---------- */
.brand-track {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--track-w);
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0 22px;
  background: linear-gradient(180deg, var(--clr-navy) 0%, var(--clr-charcoal) 100%);
  border-right: 1px solid var(--line-gold);
}

.track-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-green);
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.75);
  animation: dot-pulse 2.4s ease-in-out infinite;
  position: relative;
  z-index: 2;
}

@keyframes dot-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.8); }
}

.track-gauge {
  position: absolute;
  top: 52px;
  bottom: 104px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: rgba(212, 175, 55, 0.14);
  border-radius: 2px;
  overflow: hidden;
}

.track-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--clr-gold), var(--clr-orange));
  transform: scaleY(0);
  transform-origin: top;
  border-radius: 2px;
}

.track-word {
  writing-mode: vertical-rl;
  font-size: 0.68rem;
  letter-spacing: 0.46em;
  text-transform: uppercase;
  color: var(--clr-gray);
  white-space: nowrap;
  padding-left: 0.2em;
}

/* ---------- 顶栏进度条 ---------- */
.scroll-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1200;
  background: linear-gradient(90deg, var(--clr-gold), var(--clr-orange));
  transform: scaleX(0);
  transform-origin: left;
  pointer-events: none;
}

@media (min-width: 1024px) {
  .scroll-bar {
    left: var(--track-w);
  }
}

/* ---------- 头部 ---------- */
.site-header {
  position: relative;
  z-index: 500;
  background: linear-gradient(180deg, var(--clr-ink) 0%, rgba(11, 27, 43, 0.96) 100%);
  border-bottom: 1px solid var(--line-gold);
}

.masthead {
  position: relative;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--shell-gap) clamp(10px, 2vw, 18px);
}

.masthead-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-light);
}

.masthead-top-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.masthead-tagline {
  font-family: var(--font-body);
  font-size: 0.62rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--clr-gray);
}

.masthead-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--clr-green);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-green);
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.7);
  animation: dot-pulse 2.4s ease-in-out infinite;
}

.masthead-brand-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 3vw, 36px);
  padding: clamp(20px, 3vw, 34px) 0 18px;
}

.brand-rule {
  flex: 1 1 auto;
  max-width: 140px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-gold), transparent);
  opacity: 0.55;
}

.brand-logo {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  flex: 0 0 auto;
}

.brand-cn {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.08em;
  color: var(--clr-light);
}

.brand-accent {
  color: var(--clr-gold);
}

.brand-en {
  display: block;
  font-size: 0.62rem;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: var(--clr-gold);
  margin-top: 8px;
  padding-left: 0.25em;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 3px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.btn-orange {
  background: var(--clr-orange);
  color: #fff;
}

.btn-orange:hover,
.btn-orange:focus-visible {
  background: #ff8255;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 107, 53, 0.35);
}

.btn-gold {
  background: var(--clr-gold);
  color: var(--clr-ink);
}

.btn-gold:hover,
.btn-gold:focus-visible {
  background: #e5c747;
  color: var(--clr-ink);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(212, 175, 55, 0.32);
}

.btn-outline {
  background: transparent;
  border-color: rgba(212, 175, 55, 0.5);
  color: var(--clr-gold);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--clr-gold);
  background: rgba(212, 175, 55, 0.08);
  color: var(--clr-gold);
}

/* ---------- 导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(8px, 2vw, 18px);
  padding: 14px 0 8px;
  border-top: 1px solid var(--line-light);
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex-wrap: wrap;
  flex: 1;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--clr-light);
  white-space: nowrap;
  border-radius: 2px;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 2px;
  background: var(--clr-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--clr-gold);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link:focus-visible {
  outline: 2px solid var(--clr-orange);
  outline-offset: -2px;
}

.btn.nav-cta {
  margin-left: clamp(8px, 2vw, 20px);
  padding: 10px 24px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

/* ---------- 导航切换按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: rgba(212, 175, 55, 0.05);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 4px;
  color: var(--clr-light);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  background: rgba(212, 175, 55, 0.12);
  border-color: var(--clr-gold);
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 20px;
}

.nav-toggle-box span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--clr-gold);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity 0.2s var(--ease);
}

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

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

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

.nav-toggle-label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--clr-charcoal) 0%, #0a1018 100%);
  border-top: 2px solid rgba(212, 175, 55, 0.4);
  padding: 64px 0 0;
  margin-top: clamp(48px, 8vw, 96px);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-gold), var(--clr-orange), transparent);
  opacity: 0.6;
}

.footer-shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--shell-gap);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.6fr 1.2fr 1fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line-light);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}

.footer-col-brand {
  gap: 12px;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--clr-light);
  line-height: 1.1;
}

.footer-brand-en {
  color: var(--clr-gold);
  margin-top: 4px;
}

.footer-desc {
  color: var(--clr-gray);
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 34ch;
  margin-bottom: 0;
}

.footer-title {
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--clr-gold);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(212, 175, 55, 0.3);
  align-self: stretch;
}

.footer-link {
  color: var(--clr-gray);
  font-size: 0.9rem;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--clr-gold);
  padding-left: 4px;
}

.footer-text {
  color: var(--clr-gray);
  font-size: 0.88rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 32px;
}

.footer-trust {
  color: var(--clr-gray);
  font-size: 0.82rem;
  margin: 0;
  max-width: 60ch;
}

.footer-legal {
  color: var(--clr-gray);
  font-size: 0.8rem;
  margin: 0;
  white-space: nowrap;
}

/* ---------- 内容容器 / 面包屑 ---------- */
.content-shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(32px, 6vw, 72px) var(--shell-gap);
}

.section {
  margin-bottom: clamp(32px, 5vw, 64px);
}

.section-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 24px;
  position: relative;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-gold), var(--clr-orange));
}

.section-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--clr-gold);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--clr-gray);
}

.breadcrumb a {
  color: var(--clr-gray);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--clr-gold);
}

.breadcrumb-sep {
  color: rgba(156, 163, 175, 0.5);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 图片容器 ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--clr-slate), var(--clr-navy));
  border-radius: 6px;
  aspect-ratio: 16 / 9;
}

.img-frame img,
.img-frame picture {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame-cut {
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

/* ---------- 斜切面板 ---------- */
.cut-panel {
  position: relative;
  padding: clamp(20px, 4vw, 36px);
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.72), rgba(14, 29, 47, 0.88));
  border: 1px solid rgba(212, 175, 55, 0.18);
  border-radius: 4px;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

/* ---------- 响应式：平板及以下 ---------- */
@media (max-width: 1023px) {
  .brand-track {
    display: none;
  }

  .masthead-tagline,
  .masthead-status {
    display: none;
  }

  .masthead-top {
    justify-content: flex-end;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: stretch;
    gap: 0;
    margin: 0;
    padding: 24px;
    background: var(--clr-charcoal);
    border-top: 2px solid var(--clr-gold);
    box-shadow: var(--shadow-panel);
    z-index: 600;
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    width: 100%;
    flex: none;
    margin-bottom: 20px;
  }

  .nav-link {
    display: block;
    padding: 14px 8px;
    border-bottom: 1px solid var(--line-light);
    font-size: 1rem;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link[aria-current="page"] {
    color: var(--clr-gold);
  }

  .btn.nav-cta {
    margin-left: 0;
    text-align: center;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* ---------- 响应式：手机 ---------- */
@media (max-width: 640px) {
  .masthead-brand-wrap {
    flex-direction: column;
    gap: 12px;
  }

  .brand-rule {
    display: none;
  }

  .brand-cn {
    font-size: clamp(1.6rem, 8vw, 2.4rem);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }

  .footer-legal {
    white-space: normal;
  }

  .nav-toggle-label {
    display: none;
  }
}