/* ============================================================
   熊猫云挂机 — panda-afk-web 主样式
   设计语言：暗色工业风 / 暖橙金 + 电光青点缀 / 工作室气质
   ============================================================ */

:root {
  --bg: #070708;
  --bg-1: #0d0d10;
  --bg-2: #14141a;
  --bg-3: #1c1c24;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  --fg: #f5f5f7;
  --fg-1: #d4d4d8;
  --fg-2: #a1a1aa;
  --fg-3: #71717a;

  --gold: #f59e0b;
  --gold-2: #fbbf24;
  --gold-glow: rgba(245, 158, 11, 0.35);
  --cyan: #06b6d4;
  --cyan-2: #22d3ee;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.5);

  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

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

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

button { font-family: inherit; cursor: pointer; }

::selection { background: var(--gold); color: #000; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-lg { padding: 14px 28px; font-size: 1.05rem; }
.btn-block { display: flex; width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-2) 100%);
  color: #1a1100;
  box-shadow: 0 4px 16px var(--gold-glow);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--gold-glow);
}

.btn-outline {
  background: transparent;
  color: var(--fg);
  border-color: var(--line-strong);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--gold);
  color: var(--gold-2);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--fg-1);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--fg);
}

/* ========== NAVBAR ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 7, 8, 0.7);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.nav.is-scrolled {
  background: rgba(7, 7, 8, 0.92);
  border-bottom-color: var(--line);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px var(--gold-glow));
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-zh {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.brand-en {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--fg-3);
  letter-spacing: 0.15em;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 0.95rem;
  color: var(--fg-1);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--gold-2); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 36px;
  height: 36px;
  padding: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--fg);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav.is-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.is-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== HERO ========== */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 120px 24px 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse 1200px 600px at 50% -10%, rgba(245, 158, 11, 0.15), transparent 60%),
    radial-gradient(ellipse 800px 600px at 90% 30%, rgba(6, 182, 212, 0.1), transparent 60%),
    var(--bg);
}

.hero-particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 100%, transparent 0%, var(--bg) 80%);
  z-index: 1;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
  opacity: 0.5;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 980px;
  text-align: center;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  font-size: 0.85rem;
  color: var(--gold-2);
  margin-bottom: 24px;
  font-weight: 500;
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-2);
  box-shadow: 0 0 8px var(--gold-2);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.title-gold {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-2) 50%, var(--cyan-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--fg-1);
  margin: 0 auto 36px;
  max-width: 640px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 60px;
}

.hero-trust {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.hero-trust li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.trust-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--gold-2);
  letter-spacing: -0.02em;
}
.trust-lbl {
  font-size: 0.85rem;
  color: var(--fg-2);
}

.hero-scroll {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  width: 24px;
  height: 40px;
  border: 2px solid var(--line-strong);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.hero-scroll span {
  display: block;
  width: 3px;
  height: 8px;
  background: var(--gold-2);
  border-radius: 2px;
  animation: scroll-down 1.6s ease-in-out infinite;
}
@keyframes scroll-down {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}

/* ========== Section 通用 ========== */
section { padding: 100px 0; }

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}
.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gold-2);
  letter-spacing: 0.25em;
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.section-head p {
  color: var(--fg-2);
  font-size: 1.05rem;
  margin: 0;
}

/* ========== SPECS ========== */
.specs { background: var(--bg-1); }

.spec-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.spec-card {
  position: relative;
  padding: 28px 22px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: left;
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
  overflow: hidden;
}
.spec-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.spec-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: var(--bg-3);
}
.spec-card:hover::before { opacity: 1; }

.spec-card--highlight {
  background: linear-gradient(160deg, rgba(245, 158, 11, 0.08), rgba(6, 182, 212, 0.04));
  border-color: rgba(245, 158, 11, 0.25);
}

.spec-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--bg);
  background: var(--gold);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.spec-icon {
  color: var(--gold-2);
  margin-bottom: 18px;
  display: inline-flex;
  padding: 10px;
  background: rgba(245, 158, 11, 0.1);
  border-radius: var(--radius-sm);
}

.spec-card h3 {
  font-size: 0.95rem;
  color: var(--fg-2);
  margin: 0 0 8px;
  font-weight: 500;
  letter-spacing: 0.05em;
}
.spec-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 8px;
}
.spec-tag {
  font-size: 0.85rem;
  color: var(--fg-2);
  line-height: 1.5;
}

/* ========== TECH ========== */
.tech { background: var(--bg); }

.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.tech-card {
  position: relative;
  padding: 40px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.3s, border-color 0.3s;
}
.tech-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.3);
}
.tech-card::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--gold-glow) 0%, transparent 70%);
  top: -100px;
  right: -100px;
  pointer-events: none;
  opacity: 0.5;
}

.tech-num {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--gold);
  margin-bottom: 16px;
  line-height: 1;
}

.tech-card h3 {
  font-size: 1.6rem;
  margin: 0 0 14px;
  font-weight: 800;
}

.tech-card p {
  color: var(--fg-2);
  margin: 0 0 20px;
  line-height: 1.7;
}

.tech-points {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}
.tech-points li {
  padding: 6px 0 6px 24px;
  position: relative;
  color: var(--fg-1);
  font-size: 0.95rem;
}
.tech-points li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--gold-2);
}

.tech-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--gold-2);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--gold);
  transition: gap 0.2s;
}
.tech-link:hover { gap: 10px; }

/* ========== SCENARIOS ========== */
.scenarios { background: var(--bg-1); }

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  position: relative;
  padding: 36px 28px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform 0.3s, border-color 0.3s;
}
.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.scenario-num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan-2);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}

.scenario-card h3 {
  font-size: 1.4rem;
  margin: 0 0 12px;
  font-weight: 700;
}

.scenario-card > p {
  color: var(--fg-2);
  margin: 0 0 18px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.scenario-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.scenario-card li {
  padding: 6px 0 6px 22px;
  position: relative;
  color: var(--fg-1);
  font-size: 0.9rem;
}
.scenario-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--gold-2);
  font-weight: 700;
}

/* ========== PRICING ========== */
.pricing { background: var(--bg); }

.price-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 880px;
  margin: 0 auto;
}

.price-card {
  position: relative;
  padding: 40px 32px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s, border-color 0.3s;
}
.price-card:hover {
  transform: translateY(-4px);
}

.price-card--featured {
  background: linear-gradient(160deg, rgba(245, 158, 11, 0.1), var(--bg-2) 60%);
  border-color: rgba(245, 158, 11, 0.4);
  box-shadow: 0 0 40px rgba(245, 158, 11, 0.1);
}

.price-ribbon {
  position: absolute;
  top: -1px;
  right: 24px;
  background: var(--gold);
  color: #1a1100;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 6px 14px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.price-head h3 {
  font-size: 1.4rem;
  margin: 0 0 4px;
  font-weight: 700;
}
.price-availability {
  font-size: 0.85rem;
  color: var(--fg-3);
}

.price-main {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 20px 0 28px;
  color: var(--gold-2);
}
.price-currency {
  font-size: 1.4rem;
  font-weight: 600;
}
.price-amount {
  font-size: 3.6rem;
  font-weight: 900;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  line-height: 1;
}
.price-period {
  font-size: 1.1rem;
  color: var(--fg-2);
  font-weight: 500;
}

.price-features {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  flex: 1;
}
.price-features li {
  padding: 10px 0 10px 26px;
  position: relative;
  color: var(--fg-1);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--line);
}
.price-features li:last-child { border-bottom: 0; }
.price-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--gold-2);
  border-bottom: 2px solid var(--gold-2);
  transform: rotate(-45deg);
}

.price-cta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ========== SELLING ========== */
.selling { background: var(--bg-1); }

.selling-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.sell-item {
  padding: 32px 28px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.3s, border-color 0.3s;
}
.sell-item:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}
.sell-icon {
  font-size: 2rem;
  margin-bottom: 14px;
  display: inline-block;
}
.sell-item h3 {
  font-size: 1.2rem;
  margin: 0 0 10px;
  font-weight: 700;
}
.sell-item p {
  color: var(--fg-2);
  font-size: 0.95rem;
  margin: 0;
  line-height: 1.65;
}

/* ========== CTA FINAL ========== */
.cta-final { background: var(--bg); padding: 80px 0; }
.cta-card {
  text-align: center;
  padding: 60px 32px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(245, 158, 11, 0.12), transparent 70%),
    var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
.cta-card h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin: 0 0 12px;
  font-weight: 800;
}
.cta-card p {
  color: var(--fg-2);
  margin: 0 0 32px;
  font-size: 1.05rem;
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ========== FOOTER ========== */
.footer {
  background: var(--bg-1);
  border-top: 1px solid var(--line);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-logo {
  width: 36px;
  height: 36px;
  margin-bottom: 14px;
  object-fit: contain;
}
.footer-brand p {
  color: var(--fg-2);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}
.footer-col h4 {
  font-size: 0.95rem;
  margin: 0 0 14px;
  color: var(--fg);
  font-weight: 600;
}
.footer-col a {
  display: block;
  color: var(--fg-2);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--gold-2); }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--fg-3);
  font-size: 0.85rem;
}

/* ========== Reveal 动效 ========== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .spec-grid { grid-template-columns: repeat(3, 1fr); }
  .spec-card:nth-child(4),
  .spec-card:nth-child(5) { grid-column: span 1; }
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
  .nav.is-open .nav-links {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(7, 7, 8, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--line);
  }
  .nav.is-open .nav-links a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }
  .nav.is-open .nav-links a:last-child { border-bottom: 0; }
  .nav.is-open .nav-links a::after { display: none; }
  .nav.is-open .nav-cta {
    position: absolute;
    top: calc(100% + 220px);
    left: 24px;
    right: 24px;
    background: rgba(7, 7, 8, 0.98);
    padding: 16px 0;
    flex-direction: column;
    border-top: 1px solid var(--line);
  }

  .spec-grid { grid-template-columns: 1fr 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
  .selling-grid { grid-template-columns: 1fr 1fr; }
  .price-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  section { padding: 70px 0; }
  .hero { padding-top: 100px; min-height: auto; }
}

@media (max-width: 560px) {
  .container { padding: 0 16px; }
  .nav-inner { padding: 12px 16px; gap: 16px; }
  .brand-en { display: none; }
  .hero-trust { grid-template-columns: 1fr 1fr; gap: 16px; }
  .spec-grid { grid-template-columns: 1fr; }
  .selling-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-card { padding: 40px 20px; }
  .tech-card { padding: 28px; }
  .price-card { padding: 28px 20px; }
}