/* 火焰能量风 · 橙红粒子 · 强性能 · 快速响应主题 */
:root {
  --flame: #FF4500;
  --flame-light: #FF6B35;
  --ember: #FFB627;
  --flame-dim: rgba(255, 69, 0, 0.22);
  --ember-dim: rgba(255, 182, 39, 0.18);
  --coal: #14100C;
  --coal-deep: #0C0906;
  --coal-mid: #1E1710;
  --text: #FBF5EE;
  --text-dim: rgba(251, 245, 238, 0.6);
  --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--coal-deep);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== 顶部 Logo + 主导航 ===== */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(12, 9, 6, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--flame-dim);
  padding: 0 24px;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 40px; height: 40px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: 0 0 16px rgba(255,69,0,0.5), 0 0 32px rgba(255,182,39,0.2);
}
.brand-name {
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--text);
}
.brand-name em {
  font-style: normal;
  background: linear-gradient(90deg, var(--ember), var(--flame));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mainnav { display: flex; align-items: center; gap: 26px; }
.mainnav a {
  color: var(--text-dim);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
  padding: 4px 2px;
}
.mainnav a:hover, .mainnav a.active { color: var(--ember); }
.mainnav a.active::after {
  content: '';
  position: absolute;
  bottom: -6px; left: 0; right: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(90deg, var(--flame), var(--ember));
  box-shadow: 0 -2px 10px rgba(255,69,0,0.6);
}
.btn-api {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 22px;
  background: linear-gradient(135deg, var(--flame) 0%, var(--ember) 100%);
  color: #FFFFFF !important;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: all 0.2s ease;
  box-shadow: 0 4px 20px rgba(255,69,0,0.4);
}
.btn-api::after { display: none !important; }
.btn-api:hover { box-shadow: 0 6px 32px rgba(255,107,53,0.6); transform: translateY(-2px); }

/* ===== 首屏：火焰能量 ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 24px 110px;
  background:
    radial-gradient(ellipse 90% 55% at 50% 100%, rgba(255,69,0,0.14) 0%, transparent 65%),
    linear-gradient(180deg, var(--coal) 0%, var(--coal-deep) 100%);
}
#flame-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.hero-inner {
  max-width: 960px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  text-align: center;
}
.announce {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(30,23,16,0.9);
  border: 1px solid var(--flame-dim);
  border-radius: 999px;
  padding: 8px 22px;
  font-size: 0.875rem;
  color: var(--ember);
  margin-bottom: 32px;
}
.announce-dot {
  width: 8px; height: 8px;
  background: var(--flame);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  box-shadow: 0 0 12px var(--flame);
  animation: flicker 1.2s ease-in-out infinite;
}
@keyframes flicker {
  0%, 100% { opacity: 1; transform: rotate(-45deg) scale(1); }
  50% { opacity: 0.6; transform: rotate(-45deg) scale(1.25); }
}
.hero h1 {
  font-size: clamp(2.6rem, 7vw, 4.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin-bottom: 18px;
  color: var(--text);
}
.hero h1 .grad {
  background: linear-gradient(90deg, var(--ember) 0%, var(--flame) 60%, var(--flame-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: 1.125rem;
  color: var(--text-dim);
  margin-bottom: 48px;
}
.hero-cards {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}
.card {
  width: 300px;
  padding: 34px 28px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex; flex-direction: column; gap: 12px;
  position: relative;
  text-align: left;
  overflow: hidden;
}
.card:hover { transform: translateY(-6px); }
.card-primary {
  background: linear-gradient(150deg, var(--flame) 0%, #C21807 100%);
  color: #FFFFFF;
  box-shadow: 0 12px 40px rgba(255,69,0,0.4);
}
.card-primary::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 40%;
  background: linear-gradient(to top, rgba(255,182,39,0.25), transparent);
  pointer-events: none;
}
.card-primary:hover { box-shadow: 0 18px 56px rgba(255,69,0,0.55); }
.card-secondary {
  background: var(--coal-mid);
  border: 1px solid var(--flame-dim);
  color: var(--text);
}
.card-secondary:hover { border-color: var(--flame-light); box-shadow: 0 12px 36px rgba(255,69,0,0.25); }
.card-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}
.card-primary .card-icon { background: rgba(255,255,255,0.16); }
.card-secondary .card-icon { background: var(--flame-dim); }
.card-title { font-size: 1.1875rem; font-weight: 700; position: relative; z-index: 1; }
.card-desc { font-size: 0.875rem; opacity: 0.88; line-height: 1.5; position: relative; z-index: 1; }
.card-gauge {
  margin-top: 8px;
  height: 6px;
  border-radius: 6px;
  position: relative;
  z-index: 1;
  overflow: hidden;
}
.card-primary .card-gauge { background: rgba(255,255,255,0.2); }
.card-secondary .card-gauge { background: rgba(255,255,255,0.08); }
.card-gauge span {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 92%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--ember), #FFF3D6);
  animation: gaugeFlow 2s ease-in-out infinite alternate;
}
@keyframes gaugeFlow {
  from { width: 78%; }
  to { width: 96%; }
}

/* ===== 两栏布局 ===== */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}
.content-main { min-width: 0; }
.sidebar {
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.side-box {
  border: 1px solid var(--flame-dim);
  border-radius: var(--radius);
  padding: 24px;
  background: rgba(30,23,16,0.75);
}
.side-box h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--flame-dim);
  color: var(--ember);
  display: flex;
  align-items: center;
  gap: 8px;
}
.side-box ul { list-style: none; }
.side-box li { margin-bottom: 10px; }
.side-box a {
  font-size: 0.875rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.side-box a:hover { color: var(--ember); }
/* 边栏能量核心面板 */
.energy-box { text-align: center; }
.energy-core {
  width: 130px; height: 130px;
  margin: 0 auto 16px;
  border-radius: 50%;
  position: relative;
  background:
    radial-gradient(circle at 50% 65%, rgba(255,182,39,0.9) 0%, rgba(255,69,0,0.5) 40%, rgba(12,9,6,0.9) 75%);
  box-shadow:
    0 0 30px rgba(255,69,0,0.5),
    0 0 70px rgba(255,182,39,0.25),
    inset 0 0 24px rgba(255,182,39,0.4);
  display: flex; align-items: center; justify-content: center;
  animation: coreBurn 2.8s ease-in-out infinite;
}
@keyframes coreBurn {
  0%, 100% { box-shadow: 0 0 30px rgba(255,69,0,0.5), 0 0 70px rgba(255,182,39,0.25), inset 0 0 24px rgba(255,182,39,0.4); }
  50% { box-shadow: 0 0 44px rgba(255,69,0,0.7), 0 0 90px rgba(255,182,39,0.4), inset 0 0 32px rgba(255,182,39,0.55); }
}
.energy-core span {
  font-weight: 800;
  font-size: 1rem;
  color: #FFFFFF;
  text-shadow: 0 0 12px rgba(255,69,0,0.9);
  letter-spacing: 0.05em;
}
.energy-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
  padding: 8px 0;
  border-bottom: 1px dashed var(--flame-dim);
  text-align: left;
}
.energy-row:last-child { border-bottom: none; }
.energy-val { font-weight: 700; color: var(--ember); }

/* 火焰风内容区块 */
.section-block { margin-bottom: 64px; }
.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: var(--flame-dim);
  color: var(--ember);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}
.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text);
}
.section-desc {
  color: var(--text-dim);
  margin-bottom: 32px;
}

/* 能量模块卡片 */
.power-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.power-card {
  border: 1px solid var(--flame-dim);
  border-radius: var(--radius);
  padding: 28px;
  background: rgba(30,23,16,0.75);
  position: relative;
  transition: all 0.25s ease;
  overflow: hidden;
}
.power-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--flame), var(--ember));
  box-shadow: 0 -2px 12px rgba(255,69,0,0.5);
}
.power-card:hover {
  border-color: var(--flame-light);
  box-shadow: 0 12px 36px rgba(255,69,0,0.22);
  transform: translateY(-4px);
}
.power-icon {
  width: 54px; height: 54px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  background: var(--flame-dim);
  box-shadow: 0 0 20px rgba(255,69,0,0.2);
}
.power-title { font-size: 1.0625rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.power-desc { font-size: 0.875rem; color: var(--text-dim); line-height: 1.6; }

/* 能量传输图 */
.transmit-list {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.transmit {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--flame-dim);
  background: rgba(30,23,16,0.75);
  transition: all 0.2s;
}
.transmit:hover { border-color: var(--ember); transform: translateX(6px); box-shadow: 0 8px 24px rgba(255,182,39,0.15); }
.transmit-badge {
  flex-shrink: 0;
  padding: 8px 14px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--flame), var(--ember));
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.75rem;
  font-family: 'Consolas', monospace;
  box-shadow: 0 0 14px rgba(255,69,0,0.4);
}
.transmit-name { font-weight: 700; font-size: 0.9375rem; color: var(--text); }
.transmit-desc { font-size: 0.8125rem; color: var(--text-dim); margin-left: auto; text-align: right; }

/* 参数条 */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
  margin-top: 32px;
}
.stat {
  text-align: center;
  padding: 24px 12px;
  border-radius: var(--radius);
  background: rgba(30,23,16,0.85);
  border: 1px solid var(--flame-dim);
  border-bottom: 3px solid var(--flame);
}
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--ember), var(--flame-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label { font-size: 0.8125rem; color: var(--text-dim); margin-top: 4px; }

/* 步骤 */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}
.steps::before {
  content: '';
  position: absolute;
  left: 27px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--flame), var(--ember));
  opacity: 0.4;
}
.step {
  display: flex;
  gap: 24px;
  padding: 20px 0;
  position: relative;
}
.step-num {
  width: 56px; height: 56px;
  border-radius: var(--radius);
  background: var(--coal-mid);
  border: 2px solid var(--flame);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  color: var(--ember);
  font-size: 1.0625rem;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 16px rgba(255,69,0,0.3);
}
.step-content h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.step-content p { font-size: 0.875rem; color: var(--text-dim); }

/* 图片展示 */
.image-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}
.image-showcase img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--flame-dim);
  object-fit: cover;
  aspect-ratio: 16/10;
  transition: transform 0.3s, box-shadow 0.3s;
}
.image-showcase img:hover { transform: scale(1.03); box-shadow: 0 12px 36px rgba(255,69,0,0.3); border-color: var(--flame-light); }

/* API 代码块 */
.api-block {
  background: var(--coal-deep);
  border-radius: var(--radius);
  padding: 32px;
  color: #FFB627;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.875rem;
  line-height: 1.8;
  overflow-x: auto;
  position: relative;
  border: 1px solid var(--flame-dim);
}
.api-block::before {
  content: 'TURBO · POST /v1/chat/completions';
  position: absolute;
  top: -11px; left: 24px;
  background: linear-gradient(90deg, var(--flame), var(--ember));
  color: #FFFFFF;
  padding: 3px 14px;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.api-block .comment { color: #BC8A5F; }
.api-block .string { color: #FFD54F; }
.api-block .keyword { color: #FF8A65; }

/* 页脚 */
.footer {
  background: var(--coal-deep);
  border-top: 1px solid var(--flame-dim);
  padding: 64px 24px 32px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.7;
}
.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--ember);
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--ember); }
.footer-bottom {
  max-width: 1200px;
  margin: 48px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--flame-dim);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.8;
}

/* 响应式 */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
  .side-box { flex: 1 1 260px; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .mainnav a:not(.btn-api) { display: none; }
  .transmit-desc { display: none; }
}
@media (max-width: 560px) {
  .hero-cards { flex-direction: column; align-items: stretch; }
  .card { width: 100%; }
  .topbar { padding: 0 16px; }
}

/* 帮助中心特有 */
.help-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.help-nav a {
  padding: 8px 20px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--text-dim);
  text-decoration: none;
  border: 1px solid var(--flame-dim);
  transition: all 0.2s;
}
.help-nav a:hover, .help-nav a.active {
  background: linear-gradient(135deg, var(--flame), var(--ember));
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(255,69,0,0.35);
}
.faq-item {
  border: 1px solid var(--flame-dim);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  background: rgba(30,23,16,0.75);
}
.faq-q {
  padding: 18px 22px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
  color: var(--text);
}
.faq-q:hover { background: rgba(255,69,0,0.07); }
.faq-q::after {
  content: '🔥';
  font-size: 1rem;
  transition: transform 0.3s;
}
.faq-item.open .faq-q::after { transform: scale(1.25); }
.faq-a {
  padding: 0 22px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-dim);
  font-size: 0.9375rem;
  line-height: 1.7;
}
.faq-item.open .faq-a {
  padding: 0 22px 18px;
  max-height: 500px;
}

/* 网页版入口页特有 */
.web-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 64px;
}
.web-feature:nth-child(even) { direction: rtl; }
.web-feature:nth-child(even) > * { direction: ltr; }
.web-feature img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--flame-dim);
}
.web-feature h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.web-feature p { color: var(--text-dim); margin-bottom: 16px; }
.web-feature ul { list-style: none; }
.web-feature li {
  padding: 8px 0;
  padding-left: 26px;
  position: relative;
  font-size: 0.9375rem;
  color: var(--text);
}
.web-feature li::before {
  content: '⚡';
  position: absolute;
  left: 0;
  font-size: 0.8125rem;
  top: 9px;
}
@media (max-width: 768px) {
  .web-feature { grid-template-columns: 1fr; }
  .web-feature:nth-child(even) { direction: ltr; }
}