:root {
  --ink: #14201f;
  --ink-soft: #3a4a48;
  --muted: #5f736f;
  --paper: #f3f7f5;
  --paper-2: #e7efeb;
  --brand: #0b6e63;
  --brand-deep: #084f48;
  --accent: #d97706;
  --line: rgba(20, 32, 31, 0.12);
  --glow: rgba(11, 110, 99, 0.22);
  --radius: 18px;
  --font-display: "Syne", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

code {
  font-size: 0.92em;
  padding: 0.1em 0.35em;
  border-radius: 6px;
  background: rgba(11, 110, 99, 0.1);
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(48px);
  opacity: 0.55;
}

.blob-a {
  width: 48vw;
  height: 48vw;
  top: -12vw;
  right: -8vw;
  background: radial-gradient(circle, #9fd8cf 0%, transparent 70%);
  animation: drift 18s ease-in-out infinite alternate;
}

.blob-b {
  width: 36vw;
  height: 36vw;
  bottom: 8vh;
  left: -10vw;
  background: radial-gradient(circle, #f6d7a8 0%, transparent 70%);
  animation: drift 22s ease-in-out infinite alternate-reverse;
}

.grid-mesh {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(11, 110, 99, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 110, 99, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 20%, black 20%, transparent 75%);
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(3vw, 2vh, 0) scale(1.08);
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  backdrop-filter: blur(12px);
  background: rgba(243, 247, 245, 0.78);
  border-bottom: 1px solid transparent;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.nav a:hover {
  color: var(--brand-deep);
}

.nav-cta {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  background: var(--brand);
  color: #fff !important;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--brand-deep);
}

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3.5rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
  min-height: calc(100vh - 72px);
}

.brand-hero {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--brand-deep);
  animation: rise 0.8s ease both;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.2vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  animation: rise 0.9s ease 0.08s both;
}

.hero-lead {
  margin: 1rem 0 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.05rem;
  animation: rise 1s ease 0.14s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
  animation: rise 1.05s ease 0.2s both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.2rem;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 12px 28px var(--glow);
}

.btn-primary:hover {
  background: var(--brand-deep);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.55);
  border-color: var(--line);
  color: var(--ink);
}

.btn-lg {
  min-height: 52px;
  padding-inline: 1.5rem;
  font-size: 1.05rem;
}

.hero-visual {
  animation: rise 1.1s ease 0.18s both;
}

.desk {
  border-radius: 20px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  box-shadow: 0 30px 60px rgba(8, 79, 72, 0.12);
  transform: perspective(1200px) rotateY(-6deg) rotateX(4deg);
  transform-origin: center left;
}

.desk-titlebar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 0.9rem;
  background: linear-gradient(90deg, #0b6e63, #0f766e 55%, #147a6c);
  color: #fff;
}

.desk-titlebar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
}

.desk-titlebar strong {
  margin-left: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
}

.desk-body {
  display: grid;
  grid-template-columns: 88px 1fr;
  min-height: 280px;
}

.desk-side {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.85rem 0.55rem;
  background: rgba(11, 110, 99, 0.06);
  border-right: 1px solid var(--line);
}

.chip {
  display: block;
  text-align: center;
  font-style: normal;
  font-size: 0.72rem;
  padding: 0.45rem 0.2rem;
  border-radius: 8px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.7);
}

.chip.on {
  background: var(--brand);
  color: #fff;
  font-weight: 700;
}

.desk-files {
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.row {
  padding: 0.7rem 0.85rem;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 0.92rem;
}

.row.folder {
  font-weight: 600;
  background: rgba(11, 110, 99, 0.08);
}

.row.pulse {
  border-color: rgba(217, 119, 6, 0.35);
  color: #92400e;
  background: rgba(217, 119, 6, 0.08);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.65;
  }
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4rem 1.25rem;
}

.section-alt {
  background: rgba(255, 255, 255, 0.45);
  border-block: 1px solid var(--line);
  max-width: none;
  padding-inline: max(1.25rem, calc((100% - var(--max)) / 2));
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2rem;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.feature-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.feature-rail article {
  padding: 1.25rem 1.1rem;
  border-top: 3px solid var(--brand);
  background: transparent;
}

.feature-rail h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.feature-rail p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.provider-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.provider-grid li {
  padding: 1rem 0.9rem;
  text-align: center;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent);
}

.vip-compare {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.65);
}

.vip-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 0.5rem;
  padding: 0.95rem 1.1rem;
  border-top: 1px solid var(--line);
}

.vip-row:first-child {
  border-top: none;
}

.vip-head {
  background: rgba(11, 110, 99, 0.08);
  font-weight: 700;
  font-family: var(--font-display);
}

.vip-row span:last-child {
  color: var(--brand-deep);
  font-weight: 600;
}

.section-download .download-panel {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.download-links {
  display: flex;
  gap: 1.25rem;
  color: var(--brand-deep);
  font-weight: 600;
}

.download-links a:hover {
  text-decoration: underline;
}

.help {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

.footer-meta {
  margin-top: 0.75rem;
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 1.5rem;
  }

  .desk {
    transform: none;
  }

  .feature-rail,
  .provider-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .feature-rail,
  .provider-grid,
  .vip-row {
    grid-template-columns: 1fr;
  }

  .vip-head span:nth-child(n + 2),
  .vip-row span:nth-child(n + 2) {
    display: inline;
  }

  .vip-row span:nth-child(2)::before {
    content: "免费 · ";
    color: var(--muted);
    font-weight: 500;
  }

  .vip-row span:nth-child(3)::before {
    content: "VIP · ";
    font-weight: 500;
  }

  .vip-head span:nth-child(n + 2)::before {
    content: none;
  }
}