/* ─── PRISM TEMPLATE ─────────────────────────────────────── */
/* 浅色 SaaS 风 · 交替大图排版 · 简洁大气 · Notion/Linear 风格 */

:root {
  --bg:      #FAFAFA;
  --bg-alt:  #F2F4F7;
  --surface: #FFFFFF;
  --border:  #E4E7EC;
  --text:    #0F172A;
  --text2:   #64748B;
  --text3:   #94A3B8;
  --max-w:   1240px;
  --radius:  20px;
  --ease:    cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif; background: var(--bg); color: var(--text); overflow-x: hidden; line-height: 1.5; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ─── NAV ────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; gap: 32px;
  padding: 0 max(24px, calc((100% - var(--max-w)) / 2 + 24px));
  height: 64px;
  background: rgba(250,250,250,0.9);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; color: var(--text); letter-spacing: -0.02em; flex-shrink: 0; }
.nav-logo { height: 28px; }
.nav-links { display: flex; align-items: center; gap: 32px; margin: 0 auto; }
.nav-links a { font-size: 14px; color: var(--text2); font-weight: 500; transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }
.nav-cta { padding: 8px 20px; background: var(--text); color: #fff; border-radius: 8px; font-size: 13px; font-weight: 600; transition: opacity 0.15s, transform 0.15s; }
.nav-cta:hover { opacity: 0.8; transform: translateY(-1px); }

/* ─── HERO ───────────────────────────────────────────────── */
.hero {
  padding: 112px max(24px, calc((100% - var(--max-w)) / 2 + 24px)) 80px;
  border-bottom: 1px solid var(--border);
}
.hero-body { max-width: 780px; margin-bottom: 64px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 14px; border-radius: 980px;
  border: 1px solid var(--border); background: var(--surface);
  font-size: 12px; font-weight: 600; color: var(--text2);
  letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(48px, 6.5vw, 88px);
  font-weight: 800; letter-spacing: -0.05em; line-height: 1.03;
  color: var(--text); margin-bottom: 18px;
}
.hero-en { font-size: 13px; color: var(--text3); font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 20px; }
.hero-desc { font-size: 18px; color: var(--text2); line-height: 1.7; max-width: 600px; margin-bottom: 40px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary { padding: 13px 28px; background: var(--text); color: #fff; border-radius: 10px; font-size: 15px; font-weight: 600; transition: opacity 0.15s, transform 0.15s; }
.btn-primary:hover { opacity: 0.82; transform: translateY(-1px); }
.btn-secondary { padding: 13px 28px; background: transparent; color: var(--text); border: 1px solid var(--border); border-radius: 10px; font-size: 15px; font-weight: 500; transition: border-color 0.2s, background 0.2s; }
.btn-secondary:hover { border-color: var(--text); background: var(--bg-alt); }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--border); }
.hero-stat { flex: 1; display: flex; flex-direction: column; gap: 4px; padding: 28px 0; border-right: 1px solid var(--border); }
.hero-stat:last-child { border-right: none; }
.hero-stat-val { font-size: 32px; font-weight: 800; letter-spacing: -0.04em; color: var(--text); }
.hero-stat-label { font-size: 12px; color: var(--text3); font-weight: 500; }

/* ─── SECTION COMMONS ────────────────────────────────────── */
.section { padding: 96px max(24px, calc((100% - var(--max-w)) / 2 + 24px)); }
.section--alt { background: var(--bg-alt); }
.section-inner { max-width: var(--max-w); margin: 0 auto; }
.section-header { margin-bottom: 72px; }
.eyebrow { font-size: 11px; font-weight: 700; color: var(--text3); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 12px; }
.section-title { font-size: clamp(30px, 4vw, 52px); font-weight: 800; letter-spacing: -0.04em; line-height: 1.1; color: var(--text); margin-bottom: 14px; }
.section-sub { font-size: 16px; color: var(--text2); line-height: 1.65; max-width: 520px; }

/* ─── FEATURE ROWS (Products) ────────────────────────────── */
.products-section .section-header { max-width: 640px; }

.feature-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 80px; align-items: center;
  padding: 80px 0; border-bottom: 1px solid var(--border);
}
.feature-row:last-child { border-bottom: none; padding-bottom: 0; }
.feature-row--reverse .feature-visual { order: 2; }
.feature-row--reverse .feature-text { order: 1; }

/* Visual side */
.feature-visual { position: relative; }
.feature-glow {
  position: absolute; inset: -20px; border-radius: 28px;
  opacity: 0.6; pointer-events: none; z-index: 0;
  filter: blur(40px);
}
.feature-img-wrap {
  position: relative; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 16/9;
  box-shadow: 0 20px 60px rgba(0,0,0,0.1), 0 4px 16px rgba(0,0,0,0.05);
  background: var(--bg-alt); z-index: 1;
  border: 1px solid var(--border);
}
.feature-img { width: 100%; height: 100%; object-fit: cover; }
.feature-placeholder {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--bg-alt), var(--border));
}
.feature-initial { font-size: 80px; font-weight: 800; color: var(--c); opacity: 0.2; letter-spacing: -0.05em; }

/* Carousel */
.carousel-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity 0.5s ease; }
.carousel-img.active { opacity: 1; }
.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(8px);
  border: 1px solid rgba(0,0,0,0.08); cursor: pointer;
  font-size: 22px; color: #111; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.2s; z-index: 6;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}
.feature-img-wrap:hover .carousel-btn { opacity: 1; }
.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }
.carousel-dots { position: absolute; bottom: 12px; left: 50%; transform: translateX(-50%); display: flex; gap: 6px; z-index: 6; }
.carousel-dot { width: 6px; height: 6px; border-radius: 50%; background: rgba(255,255,255,0.55); cursor: pointer; transition: background 0.2s, transform 0.2s; }
.carousel-dot.active { background: #fff; transform: scale(1.3); }

/* Text side */
.feature-number {
  font-size: 11px; font-weight: 700; color: var(--c);
  letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 14px; opacity: 0.7;
}
.feature-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.tag {
  padding: 4px 11px; border-radius: 6px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.04em;
  background: color-mix(in srgb, var(--c) 9%, transparent);
  color: var(--c); text-transform: uppercase;
  border: 1px solid color-mix(in srgb, var(--c) 18%, transparent);
}
.feature-name {
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 800; letter-spacing: -0.035em; line-height: 1.1;
  color: var(--text); margin-bottom: 8px;
}
.feature-tagline { font-size: 16px; font-weight: 600; margin-bottom: 18px; line-height: 1.4; }
.feature-desc { font-size: 15px; color: var(--text2); line-height: 1.75; margin-bottom: 24px; }
.feature-highlights { display: flex; flex-direction: column; gap: 10px; margin-bottom: 32px; }
.feature-highlights li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: var(--text2); line-height: 1.55; }
.hl-check {
  width: 18px; height: 18px; border-radius: 50%;
  font-size: 10px; font-weight: 700; color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 1px;
}
.feature-footer { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.feature-cta { padding: 11px 24px; color: #fff; border-radius: 9px; font-size: 14px; font-weight: 600; transition: opacity 0.15s, transform 0.15s; }
.feature-cta:hover { opacity: 0.85; transform: translateY(-1px); }
.status-badge { display: inline-flex; align-items: center; gap: 5px; padding: 4px 11px; border-radius: 980px; font-size: 11px; font-weight: 600; border: 1px solid var(--border); background: var(--bg-alt); }
.status-dot { display: inline-block; width: 5px; height: 5px; border-radius: 50%; }
.status-badge--live { color: #15803d; } .status-badge--live .status-dot { background: #22c55e; box-shadow: 0 0 0 2px rgba(34,197,94,0.2); }
.status-badge--beta { color: #b45309; } .status-badge--beta .status-dot { background: #f59e0b; }
.status-badge--dev  { color: #6b7280; } .status-badge--dev  .status-dot { background: #9ca3af; }

/* ─── ABOUT ──────────────────────────────────────────────── */
.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-left .section-title { text-align: left; margin-bottom: 18px; }
.about-desc { font-size: 16px; color: var(--text2); line-height: 1.8; margin-bottom: 32px; }
.about-meta { display: flex; gap: 40px; }
.about-meta-item { display: flex; flex-direction: column; gap: 3px; }
.about-meta-label { font-size: 11px; color: var(--text3); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; }
.about-meta-val { font-size: 24px; font-weight: 800; color: var(--text); letter-spacing: -0.03em; }
.about-values { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.value-card { padding: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; transition: box-shadow 0.22s, transform 0.22s; }
.value-card:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.07); transform: translateY(-2px); }
.value-icon { font-size: 28px; display: block; margin-bottom: 12px; }
.value-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.value-desc { font-size: 13px; color: var(--text2); line-height: 1.6; }

/* ─── TECH ───────────────────────────────────────────────── */
.tech-header { margin-bottom: 48px; }
.tech-header .section-sub { margin-top: 10px; }
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.tech-card { padding: 26px 22px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; transition: box-shadow 0.22s, transform 0.22s; }
.tech-card:hover { box-shadow: 0 6px 24px rgba(0,0,0,0.06); transform: translateY(-2px); }
.tech-name { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.tech-desc { font-size: 13px; color: var(--text2); line-height: 1.6; }

/* ─── CONTACT ────────────────────────────────────────────── */
.contact-section { padding: 120px max(24px, calc((100% - var(--max-w)) / 2 + 24px)); text-align: center; border-top: 1px solid var(--border); }
.contact-inner { max-width: 740px; margin: 0 auto; }
.contact-title { font-size: clamp(40px, 5.5vw, 68px); font-weight: 800; letter-spacing: -0.04em; line-height: 1.08; color: var(--text); margin-bottom: 16px; }
.contact-subtitle { font-size: 17px; color: var(--text2); max-width: 490px; margin: 0 auto 48px; line-height: 1.65; }
.contact-methods { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 24px; }
.contact-method {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 22px; border-radius: 14px;
  background: var(--surface); border: 1px solid var(--border);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  color: var(--text); min-width: 170px;
}
.contact-method:hover { border-color: #bbb; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.07); }
.contact-method--primary { border-color: #d0d5dd; }
.contact-method-icon { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; background: var(--bg-alt); }
.contact-method-icon svg { width: 18px; height: 18px; color: var(--text); }
.contact-method-content { display: flex; flex-direction: column; gap: 2px; text-align: left; }
.contact-method-label { font-size: 10px; font-weight: 600; color: var(--text3); letter-spacing: 0.06em; text-transform: uppercase; }
.contact-method-value { font-size: 13px; font-weight: 600; color: var(--text); }
.contact-address { font-size: 13px; color: var(--text3); margin-top: 10px; }

/* ─── FOOTER ─────────────────────────────────────────────── */
footer { border-top: 1px solid var(--border); padding: 24px max(24px, calc((100% - var(--max-w)) / 2 + 24px)); display: flex; align-items: center; justify-content: space-between; }
.footer-brand { font-size: 14px; font-weight: 700; color: var(--text2); }
.footer-copy  { font-size: 12px; color: var(--text3); }
.footer-icp   { font-size: 12px; color: var(--text3); }

/* ─── ANIMATIONS ─────────────────────────────────────────── */
.fade-up  { opacity: 0; transform: translateY(28px); transition: opacity 0.72s ease, transform 0.72s var(--ease); }
.fade-up.in  { opacity: 1; transform: none; }
.fade-in  { opacity: 0; transition: opacity 0.72s ease; }
.fade-in.in  { opacity: 1; }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .feature-row { grid-template-columns: 1fr; gap: 40px; }
  .feature-row--reverse .feature-visual,
  .feature-row--reverse .feature-text { order: unset; }
  .about-layout { grid-template-columns: 1fr; gap: 48px; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .about-values { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 8px; text-align: center; }
  .contact-method { flex: 1 1 calc(50% - 6px); min-width: 0; }
}
@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .contact-method { flex: 1 1 100%; }
}