/*
  Theme: Nebula Ink / 星墨工坊
  - Base: Deep indigo-ink (#1a1a2e)
  - Primary: Warm Tangerine (#ff6b35)
  - Secondary: Electric Cyan (#00d4aa)
  - Accent: Violet (#8b5cf6)
  - Surface: White (#fff)
*/

:root {
  --ink: #1a1a2e;
  --tangerine: #ff6b35;
  --cyan: #00d4aa;
  --violet: #8b5cf6;
  --gold: #ffc700;
  --rose: #f43f5e;
  --sky: #38bdf8;
  --white: #ffffff;
  --mist: #f0f4f8;
  --slate-light: #475569;
  --slate: #334155;
  --slate-dark: #1e293b;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--mist);
  color: var(--slate);
  line-height: 1.6;
  font-size: 16px;
}

/* --- Animation --- */
@keyframes spin {
  from { transform: rotate(0deg); } 
  to { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- General & Helpers --- */
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.sec {
  padding: 80px 0;
}

.sec-white { background-color: var(--white); }
.sec-mist { background-color: var(--mist); }
.sec-ink { background-color: var(--ink); color: var(--mist); }

.sec-head {
  text-align: center;
  margin-bottom: 60px;
}

.sec-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}
.sec-chip.sc-tang { background-color: #ff6b3520; color: var(--tangerine); }
.sec-chip.sc-cyan { background-color: #00d4aa20; color: var(--cyan); }
.sec-chip.sc-violet { background-color: #8b5cf620; color: var(--violet); }
.sec-chip.sc-ink { background-color: #ffffff20; color: var(--white); }
.sec-chip-dot { width: 8px; height: 8px; border-radius: 50%; background-color: currentColor; margin-right: 8px; }

.sec-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--slate-dark);
  margin-bottom: 16px;
}

.sec-sub {
  font-size: 18px;
  max-width: 600px;
  margin: 0 auto;
  color: var(--slate-light);
}

.sec-ink .sec-title, .sec-ink .sec-sub {
  color: var(--white);
}

.hl { color: var(--tangerine); }
.hl2 { color: var(--cyan); }
.hl3 { color: var(--violet); }

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
}
.btn-lg { padding: 16px 40px; font-size: 18px; }
.btn-sm { padding: 8px 16px; font-size: 14px; }

.btn-tang { background-color: var(--tangerine); color: var(--white); }
.btn-tang:hover { background-color: #ff8556; transform: translateY(-2px); }

.btn-cyan { background-color: var(--cyan); color: var(--ink); }
.btn-cyan:hover { background-color: #2cffc7; transform: translateY(-2px); }

.btn-outline { border-color: var(--tangerine); color: var(--tangerine); }
.btn-outline:hover { background-color: var(--tangerine); color: var(--white); }

.btn-white { background-color: var(--white); color: var(--ink); }
.btn-white:hover { background-color: var(--mist); }

.btn-ghost { border-color: #ffffff80; color: var(--white); }
.btn-ghost:hover { background-color: var(--white); color: var(--ink); }

/* --- Navigation --- */
.nb-nav {
  position: sticky;
  top: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid #e2e8f0;
}

.nb-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nb-brand {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 24px;
  color: var(--slate-dark);
  text-decoration: none;
}

.nb-brand-icon {
  width: 32px;
  height: 32px;
  margin-right: 10px;
}

.nb-links {
  display: flex;
  gap: 10px;
}

.nb-link {
  padding: 8px 16px;
  font-weight: 600;
  color: var(--slate-light);
  text-decoration: none;
  border-radius: 99px;
  transition: all 0.3s ease;
}

.nb-link:hover {
  color: var(--slate-dark);
}

.nb-link.on {
  background-color: var(--tangerine);
  color: var(--white);
}

.nb-mob {
  display: none;
  background: none; border: none; cursor: pointer;
}

/* --- Hero --- */
.hero {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--ink) 0%, #2c2c54 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-eyebrow {
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 16px;
}

.hero-h1 {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-p {
  font-size: 20px;
  color: #a8b2c5;
  margin-bottom: 32px;
}

.hero-btns { display: flex; gap: 16px; }

.hero-trust {
  margin-top: 40px;
  font-size: 14px;
  color: #a8b2c5;
}

.hero-vis {
  position: relative;
}

.hero-dash {
  background-color: #292942; /* Slightly lighter ink */
  border-radius: 12px;
  padding: 20px;
  border: 1px solid #47556950;
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.hd-top { display: flex; align-items: center; gap: 6px; margin-bottom: 20px; }
.hd-dot { width: 12px; height: 12px; border-radius: 50%; }
.hd-dot.r { background-color: #ff5f57; }
.hd-dot.y { background-color: #ffbd2e; }
.hd-dot.g { background-color: #28c940; }

.hd-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.hd-card {
  background-color: #1a1a2e;
  padding: 16px;
  border-radius: 8px;
}

.hd-card-label { font-size: 14px; color: #a8b2c5; margin-bottom: 8px; }
.hd-card-val { font-size: 24px; font-weight: 700; }
.cv-tang { color: var(--tangerine); }
.cv-cyan { color: var(--cyan); }
.cv-violet { color: var(--violet); }
.cv-gold { color: var(--gold); }

/* --- Stats Strip --- */
.stats-strip { padding: 40px 0; background-color: var(--mist); }
.stats-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 30px;
  text-align: center;
}
.st-item { border-right: 1px solid #d1d5db; padding-right: 20px; }
.st-item:last-child { border-right: none; }
.st-num { font-size: 32px; font-weight: 700; }
.st-lbl { font-size: 14px; color: var(--slate-light); }
.cn-tang { color: var(--tangerine); }
.cn-cyan { color: var(--cyan); }
.cn-violet { color: var(--violet); }
.cn-gold { color: var(--gold); }
.cn-rose { color: var(--rose); }

/* --- Features --- */
.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feat-card {
  background-color: var(--white);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  border-top: 4px solid transparent;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
}
.feat-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1); }
.feat-card.fc-tang:hover { border-top-color: var(--tangerine); }
.feat-card.fc-cyan:hover { border-top-color: var(--cyan); }
.feat-card.fc-violet:hover { border-top-color: var(--violet); }
.feat-card.fc-gold:hover { border-top-color: var(--gold); }
.feat-card.fc-rose:hover { border-top-color: var(--rose); }
.feat-card.fc-sky:hover { border-top-color: var(--sky); }

.feat-icon {
  width: 48px; height: 48px;
  margin: 0 auto 20px auto;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
}
.fi-tang { background-color: #ff6b3520; color: var(--tangerine); }
.fi-cyan { background-color: #00d4aa20; color: var(--cyan); }
.fi-violet { background-color: #8b5cf620; color: var(--violet); }
.fi-gold { background-color: #ffc70020; color: var(--gold); }
.fi-rose { background-color: #f43f5e20; color: var(--rose); }
.fi-sky { background-color: #38bdf820; color: var(--sky); }

.feat-name { font-size: 20px; font-weight: 600; margin-bottom: 12px; color: var(--slate-dark); }
.feat-desc { font-size: 15px; color: var(--slate-light); }

/* --- Deep Dive Sections --- */
.deep-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0;
}
.deep-row.flip { grid-template-columns: 1fr 1fr; }
.deep-row.flip .deep-info { order: 2; }
.deep-row.flip .deep-vis { order: 1; }

.deep-chip { display: inline-flex; align-items: center; padding: 4px 12px; border-radius: 99px; font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.dc-tang { background-color: #ff6b3520; color: var(--tangerine); }
.dc-cyan { background-color: #00d4aa20; color: var(--cyan); }
.dc-violet { background-color: #8b5cf620; color: var(--violet); }
.dc-gold { background-color: #ffc70020; color: var(--gold); }

.deep-h3 { font-size: 28px; font-weight: 700; margin-bottom: 16px; color: var(--slate-dark); }
.deep-desc { margin-bottom: 24px; }
.deep-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.deep-list-item { display: flex; align-items: center; }
.dl-dot { width: 20px; height: 20px; margin-right: 12px; }

.deep-vis { background-color: var(--white); border-radius: 12px; padding: 24px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); }
.dv-panel-title { font-weight: 600; margin-bottom: 20px; }
.dv-bar-row { margin-bottom: 12px; }
.dv-bar-label { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 6px; }
.dv-bar-track { background-color: var(--mist); height: 8px; border-radius: 4px; overflow: hidden; }
.dv-bar-fill { height: 100%; border-radius: 4px; }
.dvf-tang { background-color: var(--tangerine); }
.dvf-cyan { background-color: var(--cyan); }
.dvf-violet { background-color: var(--violet); }
.dvf-gold { background-color: var(--gold); }

.dv-stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 24px; text-align: center; }
.dv-stat-n { font-size: 24px; font-weight: 700; }
.dv-stat-l { font-size: 12px; color: var(--slate-light); }
.c-tang { color: var(--tangerine); }
.c-cyan { color: var(--cyan); }
.c-violet { color: var(--violet); }

/* --- Platforms --- */
.plat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.plat-card {
  background-color: var(--white);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.plat-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.plat-card.featured { border: 2px solid var(--tangerine); }
.plat-badge { font-size: 12px; font-weight: 600; padding: 4px 8px; border-radius: 99px; background-color: var(--tangerine); color: var(--white); margin-bottom: 16px; display: inline-block; }
.plat-icon { width: 48px; height: 48px; margin: 0 auto 16px auto; }
.plat-name { font-size: 20px; font-weight: 600; margin-bottom: 8px; color: var(--slate-dark); }
.plat-ver { font-size: 14px; color: var(--slate-light); margin-bottom: 16px; }
.plat-req { font-size: 12px; color: var(--slate-light); margin-bottom: 24px; }

/* --- Reviews --- */
.rev-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.rev-card {
  background-color: var(--white);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.rev-header { display: flex; align-items: center; margin-bottom: 16px; }
.rev-avatar { width: 48px; height: 48px; border-radius: 50%; margin-right: 16px; background-size: cover; }
.av-tang { background: linear-gradient(45deg, var(--tangerine), #ffc700); }
.av-cyan { background: linear-gradient(45deg, var(--cyan), #38bdf8); }
.av-violet { background: linear-gradient(45deg, var(--violet), #f43f5e); }
.av-gold { background: linear-gradient(45deg, var(--gold), #ff8556); }
.av-rose { background: linear-gradient(45deg, var(--rose), #ff6b35); }
.av-sky { background: linear-gradient(45deg, var(--sky), #00d4aa); }
.rev-meta { flex-grow: 1; }
.rev-name { font-weight: 600; color: var(--slate-dark); }
.rev-role { font-size: 14px; color: var(--slate-light); }
.rev-stars { color: var(--gold); }
.rev-text { font-style: italic; }

/* --- Security --- */
.sec-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-bottom: 60px; }
.sec-card { text-align: center; }
.sec-card-icon { width: 48px; height: 48px; margin: 0 auto 16px auto; color: var(--cyan); }
.sec-card-title { font-weight: 600; margin-bottom: 8px; }
.sec-card-desc { font-size: 14px; color: var(--slate-light); }

.cmp-wrap { overflow-x: auto; }
.cmp-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  text-align: left;
  background-color: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.cmp-table th, .cmp-table td { padding: 16px; border-bottom: 1px solid var(--mist); }
.cmp-table th { background-color: var(--mist); font-weight: 600; }
.cmp-hl { font-weight: 600; color: var(--tangerine); }
.yes { color: var(--cyan); font-weight: 700; }

/* --- Versions --- */
.ver-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; align-items: start; }
.ver-card {
  background-color: var(--white);
  padding: 30px;
  border-radius: 12px;
  border: 2px solid transparent;
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.ver-card.popular { border-color: var(--tangerine); transform: scale(1.05); }
.ver-badge { font-size: 12px; font-weight: 600; padding: 4px 8px; border-radius: 99px; background-color: var(--tangerine); color: var(--white); margin-bottom: 16px; display: inline-block; }
.ver-name { font-size: 22px; font-weight: 600; margin-bottom: 8px; }
.ver-price { font-size: 36px; font-weight: 800; margin-bottom: 24px; }
.ver-features { list-style: none; text-align: left; margin-bottom: 30px; display: flex; flex-direction: column; gap: 12px; }
.ver-check { display: flex; align-items: center; }
.ver-check svg { width: 20px; height: 20px; margin-right: 10px; color: var(--cyan); }
.ver-cta { margin-top: auto; }

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background-color: var(--white);
  border-radius: 8px;
  margin-bottom: 12px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 18px;
}
.faq-chevron { transition: transform 0.3s ease; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.5s ease-in-out; }
.faq-a-inner { padding: 0 20px 20px 20px; border-top: 1px solid var(--mist); }
.faq-item.open .faq-a { max-height: 300px; }

/* --- CTA Banner --- */
.cta-banner {
  background: linear-gradient(90deg, var(--tangerine), var(--violet));
  color: var(--white);
  padding: 60px 0;
  text-align: center;
  border-radius: 16px;
}
.cta-h2 { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.cta-p { font-size: 18px; margin-bottom: 32px; opacity: 0.9; }

/* --- Footer --- */
.nb-footer {
  background-color: var(--ink);
  color: #a8b2c5;
  padding: 40px 0;
  text-align: center;
  font-size: 14px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .feat-grid, .rev-grid, .ver-grid { grid-template-columns: repeat(2, 1fr); }
  .deep-row { grid-template-columns: 1fr; }
  .deep-row.flip .deep-info, .deep-row.flip .deep-vis { order: 0; }
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-btns { justify-content: center; }
  .hero-vis { margin-top: 40px; }
  .stats-row { grid-template-columns: repeat(3, 1fr); }
  .plat-grid { grid-template-columns: repeat(2, 1fr); }
  .sec-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nb-links { display: none; }
  .nb-mob { display: block; }

  .nb-links.show {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--white);
    padding: 20px;
    gap: 16px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  }

  .feat-grid, .rev-grid, .ver-grid, .plat-grid, .sec-grid { grid-template-columns: 1fr; }
  .ver-card.popular { transform: scale(1); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .st-item { border-right: none; }
}

@media (max-width: 480px) {
  .sec { padding: 60px 0; }
  .sec-title { font-size: 28px; }
  .hero-h1 { font-size: 36px; }
  .stats-row { grid-template-columns: 1fr; }
  .st-item { padding-bottom: 20px; border-bottom: 1px solid #d1d5db; }
}