/* ============================================================
   Gemini Omni · 现代产品官网
   暖白底 + 黑字 + 朱砂作单一品牌色，PingFang 为主 / 思源宋体仅 Hero 大标题
   ============================================================ */

:root {
  --bg:        #fbfaf7;       /* 暖白纸 */
  --bg-2:      #f4f2ec;       /* 强调块底 */
  --bg-3:      #efece4;       /* 较深一档 */
  --ink:       #0a0a0a;       /* 主文字 */
  --ink-2:     #404040;       /* 副文字 */
  --ink-3:     #707070;       /* 旁注文字 */
  --ink-4:     #9b9586;       /* 极淡 */
  --line:      #e7e3d6;
  --line-2:    #d8d3c4;
  --brand:     #c8442a;       /* 朱砂品牌色 */
  --brand-2:   #b3381f;
  --ok:        #4a7f50;
  --max-w: 1240px;

  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans:  "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--ink); text-decoration: none; transition: color .2s; }
a:hover { color: var(--brand); }
::selection { background: var(--brand); color: var(--bg); }
p { margin: 0 0 14px; color: var(--ink-2); }

/* ===== 顶部导航 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 247, 0.88);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  margin-right: auto;
}
.logo { width: 30px; height: 30px; display: block; border-radius: 7px; }
.brand span {
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -.005em;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 14px;
  color: var(--ink-2);
  font-weight: 500;
}
.nav-links a:hover { color: var(--ink); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.link-quiet {
  font-size: 14px;
  color: var(--ink-2);
  font-weight: 500;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .005em;
  transition: all .2s ease;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: var(--sans);
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--brand);
  border-color: var(--brand);
  color: var(--bg);
  transform: translateY(-1px);
}
.btn-ghost {
  background: var(--bg);
  color: var(--ink);
  border-color: var(--line-2);
}
.btn-ghost:hover {
  border-color: var(--ink);
  background: var(--bg);
  color: var(--ink);
}
.btn-lg {
  padding: 14px 26px;
  font-size: 15px;
  border-radius: 10px;
}

/* ===== Hero ===== */
.hero {
  max-width: 980px;
  margin: 0 auto;
  padding: 96px 32px 64px;
  text-align: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--brand);
  background: rgba(200, 68, 42, .06);
  border: 1px solid rgba(200, 68, 42, .18);
  padding: 6px 14px;
  border-radius: 100px;
  margin: 0 0 28px;
}
.dot {
  width: 6px; height: 6px;
  background: var(--brand);
  border-radius: 50%;
  display: inline-block;
}
h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 0 0 28px;
  color: var(--ink);
}
.hl {
  background: linear-gradient(180deg, transparent 60%, rgba(200, 68, 42, .22) 60%);
  padding: 0 2px;
}
.lead {
  font-size: 19px;
  color: var(--ink-2);
  max-width: 36em;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.hero-actions.centered { justify-content: center; }
.micro {
  font-size: 13px;
  color: var(--ink-3);
  margin: 0;
}

/* ===== Hero 数据条 ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: 880px;
  margin: 64px auto 0;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stats > div {
  text-align: center;
  padding: 4px 12px;
  border-left: 1px solid var(--line);
}
.stats > div:first-child { border-left: none; }
.stats dt {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 40px);
  color: var(--ink);
  line-height: 1;
  letter-spacing: -.02em;
  margin: 0 0 10px;
}
.stats dd {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--ink-3);
  margin: 0;
  line-height: 1.5;
  letter-spacing: .02em;
}

/* ===== 产品截图区 ===== */
.screenshot {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 32px 80px;
}
.screen-frame {
  background: var(--bg);
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow:
    0 1px 0 #fff inset,
    0 30px 60px -20px rgba(40, 30, 16, 0.18),
    0 12px 24px -8px rgba(40, 30, 16, 0.08);
}
.screen-svg {
  width: 100%; height: auto; display: block;
  border-radius: 10px;
  overflow: hidden;
}

.logos {
  text-align: center;
  margin: 60px auto 0;
  max-width: var(--max-w);
}
.logos p {
  font-size: 13px;
  color: var(--ink-3);
  margin: 0 0 22px;
  letter-spacing: .04em;
}
.logo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 48px;
  justify-content: center;
  align-items: center;
}
.logo-row svg {
  height: 28px;
  width: auto;
  opacity: .55;
  transition: opacity .25s, filter .25s;
}
.logo-row svg:hover { opacity: .9; }

/* ===== 通用 section ===== */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 120px 32px;
}
.section.narrow { max-width: 800px; }

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 3.8vw, 46px);
  line-height: 1.2;
  letter-spacing: -.015em;
  margin: 0 0 16px;
  color: var(--ink);
}
h2.centered { text-align: center; margin-left: auto; margin-right: auto; }
.sub {
  font-size: 17px;
  color: var(--ink-2);
  margin: 0 0 56px;
  line-height: 1.65;
}
.sub.centered, .centered.sub {
  text-align: center;
  max-width: 44em;
  margin-left: auto;
  margin-right: auto;
}

h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--ink);
  letter-spacing: -.005em;
}
h4 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 12px;
}

/* ===== 左右图文穿插 ===== */
.alt {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 32px 40px;
}
.alt-row {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
}
.alt-row.reverse .alt-text { order: 2; }
.alt-row.reverse .alt-figure { order: 1; }

.kicker {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--brand);
  margin: 0 0 16px;
}
.alt-text h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  margin-bottom: 20px;
}
.alt-text p {
  font-size: 16px;
  max-width: 32em;
  margin-bottom: 24px;
  line-height: 1.75;
}

.check {
  list-style: none;
  padding: 0;
  margin: 0;
}
.check li {
  font-size: 14.5px;
  color: var(--ink-2);
  padding: 6px 0 6px 24px;
  position: relative;
}
.check li::before {
  content: "";
  position: absolute;
  left: 0; top: 14px;
  width: 12px; height: 7px;
  border-left: 2px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  transform: rotate(-45deg);
}

.alt-figure { position: relative; }
.figure-svg {
  width: 100%; height: auto; display: block;
  border-radius: 12px;
  box-shadow: 0 16px 40px -12px rgba(40, 30, 16, 0.14);
}

/* ===== 创作者证言 ===== */
.voices {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px 32px 60px;
  text-align: center;
}
.kicker.centered {
  text-align: center;
  display: block;
  margin: 0 0 16px;
}
.voices h2 {
  margin: 0 auto 64px;
  max-width: 20ch;
}
.voices h2 em {
  font-style: italic;
  color: var(--brand);
}
.voices-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: left;
}
.voice {
  margin: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.voice:hover {
  transform: translateY(-3px);
  border-color: var(--line-2);
  box-shadow: 0 18px 40px -16px rgba(40, 30, 16, 0.12);
}
.voice blockquote {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
  position: relative;
  padding-top: 8px;
}
.voice blockquote::before {
  content: "“";
  position: absolute;
  top: -14px; left: -8px;
  font-family: var(--serif);
  font-size: 48px;
  line-height: 1;
  color: var(--brand);
  opacity: .35;
}
.voice figcaption {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
}
.avatar {
  width: 40px; height: 40px;
  flex-shrink: 0;
  display: block;
  border-radius: 50%;
}
.voice figcaption strong {
  display: block;
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}
.voice figcaption span {
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: .02em;
}

/* ===== Workflow band ===== */
.band {
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 120px 32px;
}
.band > * { max-width: var(--max-w); margin-left: auto; margin-right: auto; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
  position: relative;
}
/* 三步之间的连接箭头（绝对定位的两个箭头） */
.steps::before,
.steps::after {
  content: "";
  position: absolute;
  top: 56px;
  width: 18px;
  height: 1px;
  background: var(--line-2);
  z-index: 1;
}
.steps::before { left: calc(33.333% - 9px); }
.steps::after  { left: calc(66.666% - 9px); }
.steps > div {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 32px 28px;
  transition: transform .25s, border-color .25s;
  position: relative;
  z-index: 2;
}
.steps > div:hover {
  transform: translateY(-3px);
  border-color: var(--line-2);
}
.step-no {
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: var(--bg);
  background: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  margin-bottom: 18px;
  letter-spacing: 0;
  font-style: normal;
  font-family: var(--sans);
  font-weight: 600;
}
.steps > div:nth-child(2) .step-no { background: var(--brand); }
.steps > div:nth-child(3) .step-no { background: var(--ink); }
.steps p { font-size: 14.5px; margin: 6px 0 0; }

/* ===== 对比表 ===== */
.compare-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg);
}
.compare {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}
.compare th, .compare td {
  padding: 18px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  font-weight: 500;
}
.compare thead th {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: .04em;
  text-transform: uppercase;
  background: var(--bg-2);
  text-align: center;
}
.compare thead .hl-col {
  color: var(--brand);
  background: rgba(200, 68, 42, .06);
}
.compare tbody th {
  width: 22%;
  color: var(--ink);
  font-weight: 600;
  background: var(--bg);
}
.compare tbody td {
  text-align: center;
  color: var(--ink-2);
}
.compare tr:last-child th,
.compare tr:last-child td { border-bottom: none; }
.compare .ok { color: var(--brand); font-weight: 600; }
.compare .part { color: var(--ink-3); }
.compare .no { color: var(--ink-4); }
.compare tbody td:nth-child(2) {
  background: rgba(200, 68, 42, .04);
  color: var(--ink);
}

/* ===== 价格 ===== */
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}
.plan {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
}
.plan h3 {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 22px;
}
.plan.featured {
  border: 1.5px solid var(--ink);
  background: var(--bg);
  box-shadow: 0 24px 50px -20px rgba(40, 30, 16, 0.2);
}
.plan.featured h3 { color: var(--brand); }
.badge {
  position: absolute;
  top: -12px;
  left: 28px;
  background: var(--ink);
  color: var(--bg);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  padding: 5px 12px;
  border-radius: 100px;
  text-transform: uppercase;
}
.plan .price {
  margin: 0 0 24px;
  line-height: 1;
}
.plan .price strong {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 44px;
  color: var(--ink);
  letter-spacing: -.02em;
}
.plan .price span {
  font-size: 14px;
  color: var(--ink-3);
  margin-left: 4px;
}
.plan ul {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
}
.plan ul li {
  padding: 8px 0;
  font-size: 14.5px;
  color: var(--ink-2);
  position: relative;
  padding-left: 24px;
  border-bottom: 1px solid var(--line);
}
.plan ul li:last-child { border-bottom: none; }
.plan ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 16px;
  width: 10px; height: 6px;
  border-left: 1.5px solid var(--brand);
  border-bottom: 1.5px solid var(--brand);
  transform: rotate(-45deg);
}
.plan .btn { margin-top: auto; }

/* ===== FAQ ===== */
.faq {
  margin-top: 40px;
}
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.faq details[open] summary { color: var(--brand); }
.faq summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 17px;
  color: var(--ink);
  position: relative;
  padding-right: 32px;
  line-height: 1.5;
  transition: color .2s;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px; top: -2px;
  font-size: 24px;
  font-weight: 300;
  color: var(--ink-3);
  transition: transform .25s;
}
.faq details[open] summary::after {
  content: "−";
  color: var(--brand);
}
.faq p {
  margin: 14px 0 4px;
  font-size: 15.5px;
  color: var(--ink-2);
  max-width: 52em;
  line-height: 1.75;
}

/* ===== CTA ===== */
.cta {
  max-width: var(--max-w);
  margin: 80px auto;
  padding: 96px 48px;
  background: var(--ink);
  color: var(--bg);
  border-radius: 24px;
  text-align: center;
}
.cta h2 {
  color: var(--bg);
  font-size: clamp(28px, 3.6vw, 44px);
  margin: 0 auto 40px;
  max-width: 22ch;
}
.cta .btn-primary {
  background: var(--brand);
  border-color: var(--brand);
}
.cta .btn-primary:hover {
  background: var(--brand-2);
  border-color: var(--brand-2);
}
.cta .btn-ghost {
  background: transparent;
  color: var(--bg);
  border-color: rgba(255,255,255,.25);
}
.cta .btn-ghost:hover {
  color: var(--bg);
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.6);
}

/* ===== Footer ===== */
.foot {
  border-top: 1px solid var(--line);
  background: var(--bg);
  padding: 60px 32px 32px;
}
.foot-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.foot-brand p {
  font-size: 13.5px;
  color: var(--ink-3);
  max-width: 32ch;
  margin-top: 14px;
}
.foot h5 {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 18px;
}
.foot a {
  display: block;
  color: var(--ink-2);
  font-size: 14px;
  padding: 5px 0;
}
.foot a:hover { color: var(--brand); }

.foot-bottom {
  max-width: var(--max-w);
  margin: 24px auto 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 32px;
  font-size: 12.5px;
  color: var(--ink-3);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .nav-links { gap: 20px; }
  .alt-row { gap: 56px; padding: 56px 0; }
  .section { padding: 88px 32px; }
  .band { padding: 88px 32px; }
}

@media (max-width: 820px) {
  .nav-inner { flex-wrap: wrap; gap: 16px; padding: 14px 20px; }
  .nav-links { order: 3; width: 100%; flex-wrap: wrap; gap: 14px; justify-content: flex-start; }
  .hero { padding: 56px 20px 40px; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 8px 0; margin-top: 48px; }
  .stats > div:nth-child(3) { border-left: none; border-top: 1px solid var(--line); padding-top: 22px; }
  .stats > div:nth-child(4) { border-top: 1px solid var(--line); padding-top: 22px; }
  .screenshot { padding: 16px 20px 60px; }
  .alt { padding: 40px 20px; }
  .alt-row, .alt-row.reverse {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0;
  }
  .alt-row.reverse .alt-text { order: 1; }
  .alt-row.reverse .alt-figure { order: 2; }
  .section { padding: 64px 20px; }
  .band { padding: 64px 20px; }
  .voices { padding: 64px 20px 30px; }
  .voices-grid { grid-template-columns: 1fr; gap: 16px; }
  .steps { grid-template-columns: 1fr; gap: 16px; margin-top: 36px; }
  .steps::before, .steps::after { display: none; }
  .plans { grid-template-columns: 1fr; }
  .cta { padding: 64px 24px; margin: 40px 16px; border-radius: 16px; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
  .foot-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 520px) {
  .foot-grid { grid-template-columns: 1fr; }
  .logo-row { gap: 16px 28px; }
}