/* 语伴 · 官网首页样式 */

:root {
  --color-brand: #6f7ce0;
  --color-brand-soft: #a3acea;
  --color-brand-bg: #eef0fb;
  --gradient-brand: linear-gradient(135deg, #7884e8 0%, #a87bd2 100%);
  --gradient-brand-soft: linear-gradient(135deg, #eef1fc 0%, #f6edfa 100%);
  --gradient-hero: linear-gradient(135deg, #f4f6fc 0%, #faf2fb 50%, #fff 100%);

  --color-user: #4a85e8;
  --color-user-bg: #eaf1ff;
  --color-ai: #c97558;
  --color-ai-bg: #fdebe2;

  --color-text: #1f2030;
  --color-text-soft: #5a5c70;
  --color-text-mute: #9295a8;

  --color-border: #ececf1;
  --color-border-strong: #d8d9e3;
  --color-card: #ffffff;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --shadow-soft: 0 1px 2px rgba(30,32,55,0.04), 0 4px 14px rgba(30,32,55,0.05);
  --shadow-card: 0 1px 3px rgba(30,32,55,0.04), 0 8px 28px rgba(30,32,55,0.06);
  --shadow-hover: 0 2px 6px rgba(30,32,55,0.06), 0 16px 36px rgba(30,32,55,0.10);
  --shadow-brand: 0 4px 14px rgba(120,132,232,0.30);
  --shadow-brand-hover: 0 6px 20px rgba(120,132,232,0.45);

  --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background:
    radial-gradient(1400px 700px at 80% -10%, #ede4f6 0%, transparent 65%),
    radial-gradient(1100px 600px at -10% -5%, #e6ebfa 0%, transparent 60%),
    #fdfdff;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === 顶栏 === */
.top {
  position: sticky; top: 0; z-index: 100;
  background: rgba(253, 253, 255, 0.85);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  display: flex; align-items: center; gap: 2rem;
  padding: 0.9rem 1.5rem;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-weight: 700; font-size: 1.15rem; letter-spacing: 0.04em;
}
.brand .logo { font-size: 1.5rem; filter: drop-shadow(0 2px 4px rgba(120,132,232,0.4)); }
.brand .name {
  background: var(--gradient-brand);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.links { display: flex; gap: 0.4rem; flex: 1; }
.links a {
  padding: 0.5rem 0.95rem; color: var(--color-text-soft);
  border-radius: var(--radius-pill); font-size: 0.92rem;
  transition: var(--transition);
}
.links a:hover { color: var(--color-brand); background: var(--color-brand-bg); }

.cta { display: flex; gap: 0.7rem; align-items: center; }

.btn-primary {
  display: inline-block; padding: 0.65rem 1.3rem; border-radius: var(--radius-pill);
  background: var(--gradient-brand); color: #fff !important; font-weight: 500;
  box-shadow: var(--shadow-brand); transition: var(--transition);
  font-size: 0.95rem; cursor: pointer; border: none;
}
.btn-primary:hover { box-shadow: var(--shadow-brand-hover); transform: translateY(-1px); }
.btn-primary.big { padding: 0.95rem 2rem; font-size: 1.05rem; }
.btn-primary.outline {
  background: transparent; color: var(--color-brand) !important;
  border: 1.5px solid var(--color-brand); box-shadow: none;
}
.btn-primary.outline:hover { background: var(--color-brand-bg); }
.btn-primary.full { display: block; text-align: center; width: 100%; }

.btn-text {
  color: var(--color-text-soft); padding: 0.5rem 0.6rem; font-size: 0.95rem;
  transition: var(--transition);
}
.btn-text:hover { color: var(--color-brand); }
.btn-text.big { font-size: 1.05rem; padding: 0.95rem 0.6rem; }

/* === Hero === */
.hero {
  padding: 4rem 0 5rem;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
}
.kicker {
  display: inline-block; padding: 5px 14px;
  background: var(--color-brand-bg); color: var(--color-brand);
  border-radius: var(--radius-pill); font-size: 0.82rem;
  font-weight: 500; margin-bottom: 1.2rem;
}
.hero h1 {
  font-size: 3.2rem; line-height: 1.15; letter-spacing: -0.02em;
  font-weight: 700; margin-bottom: 0.6rem;
}
.hero-slogan {
  display: inline-block;
  font-size: 1.05rem;
  letter-spacing: 0.18em;
  font-weight: 500;
  color: var(--color-brand);
  background: var(--color-brand-bg);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 1.3rem;
}
.hero h1 br { display: block; }
.lead {
  font-size: 1.15rem; line-height: 1.7; color: var(--color-text-soft);
  margin-bottom: 1.8rem; max-width: 28em;
}
.lead strong { color: var(--color-text); }

.hero-cta {
  display: flex; gap: 1.1rem; align-items: center; flex-wrap: wrap;
  margin-bottom: 1.8rem;
}
.hero-bullets {
  list-style: none; display: flex; gap: 1.5rem; flex-wrap: wrap;
  font-size: 0.88rem; color: var(--color-text-mute);
}
.hero-bullets li strong { color: var(--color-text); font-weight: 500; }

/* Hero 右侧手机仿真 */
.hero-visual { display: flex; justify-content: center; align-items: center; }
.phone-mock {
  width: 100%; max-width: 380px;
  background: var(--color-card);
  border-radius: 24px;
  border: 1px solid var(--color-border);
  padding: 1.5rem 1.3rem;
  box-shadow: var(--shadow-card);
  position: relative;
}
.phone-status {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 4px 12px; border-radius: var(--radius-pill);
  background: var(--color-ai-bg); color: var(--color-ai);
  font-size: 0.78rem; font-weight: 500;
  margin-bottom: 1.1rem;
}
.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-ai);
}
.dot.live { animation: pulse-soft 1.4s ease-in-out infinite; }
@keyframes pulse-soft {
  0%, 100% { opacity: 0.45; transform: scale(0.85); }
  50%      { opacity: 1;    transform: scale(1.15); }
}

.phone-bubble {
  margin: 0.7rem 0; padding: 0.85rem 1.05rem;
  border-radius: 14px; font-size: 0.95rem; line-height: 1.55;
  position: relative;
}
.phone-bubble.user {
  background: linear-gradient(135deg, #f4f8ff, #eaf1ff);
  margin-right: 1.5rem;
}
.phone-bubble.assistant {
  background: linear-gradient(135deg, #fff5ef, #fdebe2);
  margin-left: 1.5rem;
}
.phone-bubble .tag {
  display: inline-block; font-size: 0.74rem; font-weight: 500;
  padding: 2px 9px; border-radius: var(--radius-pill);
  margin-right: 0.5rem; vertical-align: middle;
  background: #fff;
}
.phone-bubble.user .tag { color: var(--color-user); }
.phone-bubble.assistant .tag { color: var(--color-ai); }
.phone-bubble.typing .cursor {
  display: inline-block; color: var(--color-ai); font-weight: 700;
  animation: blink 1s steps(2) infinite;
  margin-left: 1px;
}
@keyframes blink { 50% { opacity: 0; } }

/* === Sections 公共 === */
.features, .how-it-works, .personas, .outputs, .pricing, .faq, .final-cta {
  padding: 5rem 0;
}
.section-h {
  font-size: 2.2rem; line-height: 1.3; letter-spacing: -0.01em;
  text-align: center; font-weight: 700; margin-bottom: 0.7rem;
}
.section-sub {
  text-align: center; color: var(--color-text-soft);
  font-size: 1.05rem; max-width: 32em; margin: 0 auto 3rem;
}

/* === Features === */
.features { background: rgba(255, 255, 255, 0.5); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.feature-card {
  background: var(--color-card);
  padding: 1.8rem 1.7rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: var(--color-brand-soft);
}
.feature-icon {
  font-size: 2rem; margin-bottom: 0.8rem;
  filter: drop-shadow(0 2px 6px rgba(120,132,232,0.25));
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.feature-card p { color: var(--color-text-soft); font-size: 0.95rem; line-height: 1.7; }
.feature-card strong { color: var(--color-brand); }

/* === How it works === */
.how-it-works h2 { margin-bottom: 3rem; }
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}
.step {
  text-align: center;
  padding: 1.5rem 1rem;
}
.step-num {
  width: 56px; height: 56px;
  margin: 0 auto 1.2rem;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; font-weight: 700; color: #fff;
  background: var(--gradient-brand);
  box-shadow: var(--shadow-brand);
}
.step h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.step p { color: var(--color-text-soft); font-size: 0.95rem; line-height: 1.7; }

/* === Personas === */
.personas { background: rgba(255, 255, 255, 0.5); }
.persona-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.3rem;
  margin-top: 2.5rem;
}
.persona-card {
  background: var(--color-card);
  padding: 1.6rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
  display: flex; flex-direction: column;
}
.persona-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: var(--color-brand-soft);
}
.persona-icon {
  font-size: 1.8rem; margin-bottom: 0.6rem;
  filter: drop-shadow(0 2px 6px rgba(120,132,232,0.25));
}
.persona-card h3 {
  font-size: 1.05rem; line-height: 1.4;
  margin-bottom: 0.45rem;
}
.persona-line {
  color: var(--color-text-soft); font-size: 0.92rem;
  line-height: 1.6; margin-bottom: 0.95rem;
  flex: 1;
}
.persona-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
}
.persona-tags span {
  display: inline-block;
  padding: 3px 10px;
  background: var(--color-brand-bg);
  color: var(--color-brand);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
}

/* === Outputs === */
.outputs {
  background: var(--gradient-brand-soft);
}
.output-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
  margin-top: 2.5rem;
}
.output-card {
  background: var(--color-card);
  padding: 1.3rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  position: relative;
  transition: var(--transition);
}
.output-card:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }
.output-card.highlight {
  border: 1.5px solid var(--color-brand);
  box-shadow: 0 4px 16px rgba(120,132,232,0.22);
  background: linear-gradient(135deg, #ffffff 0%, #fafaff 100%);
}
.output-emoji { font-size: 1.7rem; display: block; margin-bottom: 0.5rem; }
.output-card h4 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.output-card p { color: var(--color-text-soft); font-size: 0.92rem; line-height: 1.6; }
.output-card strong { color: var(--color-brand); }
.output-badge {
  position: absolute; top: 1rem; right: 1rem;
  background: var(--gradient-brand); color: #fff;
  padding: 2px 10px; border-radius: var(--radius-pill);
  font-size: 0.72rem; font-weight: 500;
  box-shadow: var(--shadow-brand);
}

/* === Pricing === */
.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 3rem 0 1.5rem;
}
/* 充值包专用：用 flex 替代 grid 让最后一行（2 张卡）能居中而不是靠左 */
.price-grid.pack-grid {
  display: flex; flex-wrap: wrap; justify-content: center;
  grid-template-columns: none;  /* override 父级 grid 设置 */
  gap: 1.1rem;
}
.price-grid.pack-grid > .price-card {
  /* 桌面 4 列：宽度 = (100% - 3*gap) / 4 */
  flex: 0 1 calc((100% - 3 * 1.1rem) / 4);
  min-width: 220px;
}
@media (max-width: 1100px) {
  .price-grid.pack-grid > .price-card {
    flex: 0 1 calc((100% - 1.1rem) / 2);  /* 2 列 */
  }
}
@media (max-width: 600px) {
  .price-grid.pack-grid > .price-card { flex: 0 1 100%; }
}
.price-card {
  background: var(--color-card);
  padding: 2rem 1.6rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  position: relative;
  display: flex; flex-direction: column;
  transition: var(--transition);
}
.price-card:hover { box-shadow: var(--shadow-card); }
.price-card.popular {
  border: 1.5px solid var(--color-brand);
  box-shadow: 0 4px 18px rgba(120,132,232,0.25);
  transform: scale(1.03);
}
.ribbon {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--gradient-brand); color: #fff;
  padding: 4px 14px; border-radius: var(--radius-pill);
  font-size: 0.78rem; font-weight: 500;
  box-shadow: var(--shadow-brand);
}
.price-card h3 { font-size: 1.05rem; color: var(--color-text-soft); font-weight: 500; margin-bottom: 0.7rem; }
.price {
  font-size: 2.6rem; font-weight: 700; line-height: 1;
  color: var(--color-text); margin-bottom: 0.4rem;
}
.price small {
  font-size: 1rem; color: var(--color-text-mute); font-weight: 500;
}
.price-meta {
  font-size: 0.92rem; color: var(--color-text-soft);
  padding-bottom: 1.2rem; border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.3rem;
}
.price-meta strong { color: var(--color-brand); font-weight: 700; }
.price-list {
  list-style: none; flex: 1; margin-bottom: 1.5rem;
}
.price-list li {
  padding: 0.45rem 0; padding-left: 1.5rem; position: relative;
  font-size: 0.92rem; color: var(--color-text);
}
.price-list li::before {
  content: "✓"; position: absolute; left: 0;
  color: var(--color-brand); font-weight: 700;
}
.annual {
  display: block; text-align: center; margin-top: 0.8rem;
  color: var(--color-text-mute); font-size: 0.8rem;
}
.pricing-foot {
  text-align: center; color: var(--color-text-mute);
  font-size: 0.92rem; margin-top: 1.5rem;
}

/* === FAQ === */
.faq { background: rgba(255, 255, 255, 0.5); }
.faq h2 { margin-bottom: 3rem; }
.faq .container { max-width: 760px; }
.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0 1.5rem;
  margin-bottom: 0.8rem;
  transition: var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-soft); }
.faq-item summary {
  cursor: pointer; font-weight: 500;
  padding: 1.2rem 0; list-style: none;
  font-size: 1.05rem;
  display: flex; align-items: center; justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 1.4rem; color: var(--color-brand);
  transition: transform 0.2s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
  padding: 0 0 1.3rem; color: var(--color-text-soft);
  line-height: 1.75; font-size: 0.95rem;
}
.faq-item strong { color: var(--color-text); font-weight: 600; }

/* === Final CTA === */
.final-cta {
  text-align: center;
  background: var(--gradient-brand-soft);
  padding: 6rem 0;
}
.final-cta h2 {
  font-size: 2.4rem; line-height: 1.3; margin-bottom: 1.8rem;
  letter-spacing: -0.01em; font-weight: 700;
  max-width: 18em; margin-left: auto; margin-right: auto;
}
.cta-foot {
  margin-top: 1rem; color: var(--color-text-mute); font-size: 0.88rem;
}

/* === Footer === */
.footer {
  background: #fff; border-top: 1px solid var(--color-border);
  padding: 2.5rem 0 1.5rem;
}
.footer-inner {
  display: flex; flex-direction: column; align-items: center;
  gap: 1.2rem;
}
.footer-brand {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-weight: 600;
}
.footer-brand .logo { font-size: 1.3rem; }
.footer-brand .name {
  background: var(--gradient-brand);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.footer-brand .domain {
  color: var(--color-text-mute); font-weight: normal;
  font-size: 0.88rem; margin-left: 0.5rem;
}
.footer-links { display: flex; gap: 1.3rem; flex-wrap: wrap; justify-content: center; }
.footer-links a {
  color: var(--color-text-soft); font-size: 0.88rem;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--color-brand); }
.footer-meta {
  color: var(--color-text-mute); font-size: 0.78rem;
  text-align: center; line-height: 1.7;
}
.footer-meta small { display: block; }

/* === 响应式：平板 === */
@media (max-width: 900px) {
  .hero h1 { font-size: 2.5rem; }
  .hero-inner { grid-template-columns: 1fr; gap: 2rem; }
  .hero-visual { order: -1; }
  .phone-mock { max-width: 340px; }

  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 1.5rem; }

  .persona-grid { grid-template-columns: repeat(2, 1fr); }

  .output-grid { grid-template-columns: repeat(2, 1fr); }

  .price-grid { grid-template-columns: 1fr; gap: 1rem; }
  .price-card.popular { transform: none; }

  .links { display: none; }  /* 平板/手机隐藏中间导航，CTA 还在 */
}

/* === 响应式：手机 === */
@media (max-width: 600px) {
  .container { padding: 0 1rem; }
  .nav { padding: 0.7rem 1rem; gap: 0.8rem; }
  .cta .btn-text { display: none; }   /* 仅留主 CTA */

  .hero { padding: 2.5rem 0 3rem; }
  .hero h1 { font-size: 2rem; }
  .lead { font-size: 1rem; }

  .features, .how-it-works, .personas, .outputs, .pricing, .faq, .final-cta {
    padding: 3rem 0;
  }
  .section-h { font-size: 1.7rem; }
  .final-cta h2 { font-size: 1.7rem; }

  .persona-grid { grid-template-columns: 1fr; }

  .output-grid { grid-template-columns: 1fr; }
}