:root {
  --color-primary: #1A56DB;
  --color-primary-light: #3B82F6;
  --color-primary-dark: #1E40AF;
  --color-accent: #F59E0B;
  --color-bg: #F8FAFC;
  --color-bg-alt: #F1F5F9;
  --color-surface: #FFFFFF;
  --color-text: #1E293B;
  --color-text-secondary: #64748B;
  --color-border: #E2E8F0;
  --color-success: #10B981;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
  --max-width: 1080px;
  --cta-h: 64px;
  --preset-h: 44px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  padding-bottom: calc(var(--cta-h) + var(--preset-h) + env(safe-area-inset-bottom, 0px));
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
[hidden] { display: none !important; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  max-width: var(--max-width); margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.site-header__brand { font-weight: 800; color: var(--color-text); font-size: 15px; }
.site-header__nav { display: flex; gap: 14px; flex-wrap: wrap; }
.site-header__nav a { font-size: 13px; color: var(--color-text-secondary); }
.site-header__nav a:hover { color: var(--color-primary); }

.b2b-container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.b2b-section { padding: 56px 0; }
.b2b-section:nth-child(even) { background: var(--color-surface); }
.b2b-section__title { margin: 0 0 8px; font-size: clamp(22px, 4vw, 28px); font-weight: 800; text-align: center; }
.b2b-section__subtitle { margin: 0 0 32px; text-align: center; color: var(--color-text-secondary); font-size: 15px; }

[data-animation] { opacity: 0; transform: translateY(24px); transition: opacity 0.5s, transform 0.5s; }
[data-animation].is-visible { opacity: 1; transform: none; }

/* Hero */
.b2b-section--hero { padding: 0; }
.hero-inner {
  min-height: 88vh; min-height: 88dvh;
  display: flex; align-items: center; justify-content: center;
  position: relative; color: #fff; text-align: center; padding: 48px 20px;
}
.hero-content { max-width: 720px; }
.hero-eyebrow { font-size: 14px; opacity: 0.9; margin-bottom: 12px; }
.hero-title { margin: 0 0 16px; font-size: clamp(28px, 5vw, 42px); font-weight: 800; line-height: 1.2; }
.hero-subtitle { margin: 0 0 28px; font-size: clamp(15px, 3vw, 18px); opacity: 0.92; }
.scroll-indicator { position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%); animation: bounce 1.5s infinite; opacity: 0.8; }
@keyframes bounce { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }

/* Trust wall */
.logo-wall { overflow: hidden; margin-bottom: 32px; mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent); }
.logo-track { display: flex; gap: 12px; width: max-content; }
.logo-wall--scroll .logo-track { animation: logoScroll 24s linear infinite; }
@keyframes logoScroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.logo-chip {
  padding: 12px 20px; background: var(--color-bg-alt); border-radius: 8px;
  font-weight: 700; color: var(--color-text-secondary); font-size: 14px; white-space: nowrap;
}
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.metrics--dark .metric-card { background: var(--color-primary-dark); color: #fff; }
.metric-card { text-align: center; padding: 24px 12px; background: var(--color-surface); border-radius: var(--radius); box-shadow: var(--shadow); }
.metric-card__value { display: block; font-size: clamp(24px, 4vw, 36px); font-weight: 800; color: var(--color-primary); }
.metrics--dark .metric-card__value { color: #fff; }
.metric-card__label { font-size: 13px; color: var(--color-text-secondary); }
.metrics--dark .metric-card__label { color: rgba(255,255,255,0.75); }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(var(--cols, 3), 1fr); gap: 16px; }
.feature-card {
  padding: 24px; background: var(--color-surface); border-radius: var(--radius);
  border: 1px solid var(--color-border); transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-card__icon { font-size: 32px; display: block; margin-bottom: 12px; }
.feature-card h3 { margin: 0 0 8px; font-size: 17px; }
.feature-card p { margin: 0; font-size: 14px; color: var(--color-text-secondary); }

/* Cases */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.case-card { background: var(--color-surface); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.case-card__cover { height: 120px; display: flex; align-items: center; justify-content: center; font-size: 48px; }
.case-card__body { padding: 16px; }
.case-card__client { font-size: 12px; color: var(--color-text-secondary); }
.case-card h3 { margin: 6px 0; font-size: 16px; }
.case-card__service { font-size: 13px; color: var(--color-text-secondary); margin: 0 0 8px; }
.case-card__result { margin: 0; font-size: 14px; font-weight: 600; color: var(--color-primary); }

/* About */
.about-grid { display: grid; gap: 32px; }
.about-intro p { color: var(--color-text-secondary); line-height: 1.8; max-width: 720px; margin: 0 auto; text-align: center; }
.timeline { max-width: 560px; margin: 0 auto; }
.timeline-item { display: flex; gap: 16px; padding: 12px 0; border-left: 3px solid var(--color-primary); padding-left: 16px; margin-left: 8px; }
.timeline-year { font-weight: 800; color: var(--color-primary); min-width: 48px; }
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px; }
.team-card { text-align: center; padding: 20px; background: var(--color-bg-alt); border-radius: var(--radius); }
.team-card img { width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 12px; }
.team-card h4 { margin: 0 0 4px; }
.team-card p { margin: 0; font-size: 13px; color: var(--color-text-secondary); }

/* Certifications */
.cert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.cert-card {
  padding: 12px; background: var(--color-surface); border-radius: var(--radius);
  border: 1px solid var(--color-border); text-align: center; transition: transform 0.2s;
}
.cert-card:hover { transform: scale(1.03); }
.cert-card img { width: 100%; height: auto; margin-bottom: 8px; }
.cert-card span { font-size: 12px; color: var(--color-text-secondary); }
.cert-lightbox {
  position: fixed; inset: 0; z-index: 400; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.cert-lightbox__panel { background: #fff; padding: 24px; border-radius: var(--radius); max-width: 320px; position: relative; text-align: center; }
.cert-lightbox__close { position: absolute; right: 8px; top: 8px; width: 32px; height: 32px; border-radius: 50%; background: var(--color-bg-alt); font-size: 20px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.contact-list { list-style: none; padding: 0; margin: 0 0 20px; }
.contact-list li { margin-bottom: 10px; font-size: 15px; }
.contact-map {
  height: 160px; border-radius: var(--radius); background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  background-image: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
  opacity: 0.25;
}
.contact-form {
  background: var(--color-surface); padding: 24px; border-radius: var(--radius);
  box-shadow: var(--shadow); border: 1px solid var(--color-border);
}
.contact-form h3 { margin: 0 0 16px; }
.form-field { margin-bottom: 14px; }
.form-field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.form-field input, .form-field textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--color-border);
  border-radius: 8px; background: var(--color-bg);
}
.form-field input:focus, .form-field textarea:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

/* CTA banner */
.cta-banner { text-align: center; padding: 48px 20px; color: #fff; }
.cta-banner--gradient { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); }
.cta-banner--dark { background: var(--color-primary-dark); }
.cta-banner h2 { margin: 0 0 8px; font-size: clamp(20px, 4vw, 26px); }
.cta-banner p { margin: 0 0 20px; opacity: 0.9; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 22px; border-radius: 8px; font-weight: 600; font-size: 15px;
  border: 2px solid transparent; transition: filter 0.2s;
}
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--accent { background: var(--color-accent); color: #1E293B; }
.btn--outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--lg { padding: 14px 32px; font-size: 16px; }
.btn--full { width: 100%; }
.btn--sm { padding: 6px 14px; font-size: 13px; }
.btn:hover { filter: brightness(1.05); }

/* CTA bar */
.cta-bar {
  position: fixed; bottom: calc(var(--preset-h) + env(safe-area-inset-bottom, 0px)); left: 0; right: 0;
  z-index: 200; display: flex; background: var(--color-surface);
  border-top: 1px solid var(--color-border); box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
  height: var(--cta-h);
}
.cta-bar__btn {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; font-size: 11px; color: var(--color-text); padding: 8px 4px;
}
.cta-bar__btn span { font-size: 20px; }
.cta-bar__btn:active { background: var(--color-bg-alt); }

/* Preset bar */
.preset-bar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 210;
  display: flex; gap: 6px; padding: 6px 10px calc(6px + env(safe-area-inset-bottom, 0px));
  background: var(--color-primary-dark); overflow-x: auto;
}
.preset-btn {
  flex-shrink: 0; padding: 6px 14px; border-radius: 999px; font-size: 12px;
  background: rgba(255,255,255,0.15); color: #fff; white-space: nowrap;
}
.preset-btn:hover { background: rgba(255,255,255,0.25); }

/* Contact footer */
.contact-footer {
  position: relative; z-index: 1;
  background: var(--color-surface); border-top: 1px solid var(--color-border);
  padding: 16px 20px; margin-top: 24px;
}
.contact-footer__btns { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.contact-footer__cta, .contact-footer__btn {
  padding: 10px 18px; border-radius: 8px; font-size: 13px; font-weight: 600;
}
.contact-footer__cta { background: var(--color-primary); color: #fff !important; }
.contact-footer__btn { background: var(--color-bg-alt); color: var(--color-text) !important; border: 1px solid var(--color-border); }
.contact-footer__brand { text-align: center; font-size: 11px; color: var(--color-text-secondary); margin: 8px 0 0; }

.b2b-toast {
  position: fixed; bottom: calc(var(--cta-h) + var(--preset-h) + 16px); left: 50%;
  transform: translateX(-50%); z-index: 500; background: var(--color-text); color: #fff;
  padding: 10px 20px; border-radius: 999px; font-size: 14px;
}
.b2b-toast[data-type="error"] { background: #EF4444; }

/* Share page */
body.share-page { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; padding: 24px 20px 100px; }
.share-card {
  max-width: 480px; margin: 0 auto; width: 100%; background: var(--color-surface);
  padding: 32px 24px; border-radius: var(--radius); box-shadow: var(--shadow); text-align: center;
}
.share-card h1 { margin: 0 0 8px; font-size: 1.4rem; }
.share-card__eyebrow { color: var(--color-primary); font-size: 0.85rem; }
.share-card__tagline { color: var(--color-text-secondary); margin: 8px 0; }
.share-card .btn { margin-bottom: 10px; width: 100%; }

/* P1 Compare */
.compare-scroll {
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  border-radius: var(--radius); border: 1px solid var(--color-border);
  background: var(--color-surface); box-shadow: var(--shadow);
}
.compare-scroll-hint {
  display: block; text-align: center; font-size: 12px;
  color: var(--color-text-secondary); margin-top: 10px;
}
.compare-table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 14px; }
.compare-table th, .compare-table td { padding: 12px 14px; border-bottom: 1px solid var(--color-border); text-align: center; }
.compare-th--corner, .compare-row-label {
  position: sticky; left: 0; z-index: 2; background: var(--color-bg-alt);
  text-align: left; font-weight: 700; min-width: 100px;
}
.compare-th--highlight, .compare-cell--highlight { background: rgba(26, 86, 219, 0.06); }
.compare-badge {
  display: inline-block; margin-left: 6px; padding: 2px 8px; border-radius: 999px;
  background: var(--color-accent); color: #1E293B; font-size: 11px; font-weight: 700;
}

/* P1 Industry tabs */
.industry-tablist {
  display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 20px;
}
.industry-tab {
  flex-shrink: 0; padding: 10px 18px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: var(--color-bg-alt); color: var(--color-text-secondary); border: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.industry-tab.is-active {
  background: var(--color-primary); color: #fff; border-color: var(--color-primary);
}
.industry-panels { position: relative; min-height: 200px; }
.industry-panel {
  display: none; grid-template-columns: 140px 1fr; gap: 20px; align-items: center;
  opacity: 0; transform: translateX(12px); transition: opacity 0.35s, transform 0.35s;
}
.industry-panel.is-active { display: grid; opacity: 1; transform: none; }
.industry-panel__visual {
  height: 120px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 48px;
}
.industry-panel__body h3 { margin: 0 0 8px; }
.industry-panel__body p { margin: 0 0 12px; color: var(--color-text-secondary); font-size: 14px; }
.industry-highlights { margin: 0 0 16px; padding-left: 18px; font-size: 14px; color: var(--color-text-secondary); }
.industry-highlights li { margin-bottom: 4px; }

/* P1 Inquiry widget */
.inquiry-widget { position: fixed; right: 16px; z-index: 300; bottom: calc(var(--cta-h) + var(--preset-h) + 72px + env(safe-area-inset-bottom, 0px)); }
.inquiry-widget__fab {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  width: 56px; height: 56px; border-radius: 50%; background: var(--color-accent); color: #1E293B;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15); font-size: 11px; font-weight: 700;
}
.inquiry-widget__fab span { font-size: 22px; }
.inquiry-widget__panel {
  position: absolute; right: 0; bottom: 64px; width: min(320px, calc(100vw - 32px));
  background: var(--color-surface); border-radius: var(--radius); padding: 20px;
  box-shadow: var(--shadow); border: 1px solid var(--color-border);
}
.inquiry-widget__panel h3 { margin: 0 0 4px; font-size: 17px; }
.inquiry-widget__sub { margin: 0 0 14px; font-size: 13px; color: var(--color-text-secondary); }
.inquiry-widget__close {
  position: absolute; right: 8px; top: 8px; width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-bg-alt); font-size: 18px;
}
.inquiry-form .form-field { margin-bottom: 10px; }

/* P1 Share ops */
.share-ops-fab {
  position: fixed; left: 16px; z-index: 300;
  bottom: calc(var(--cta-h) + var(--preset-h) + 72px + env(safe-area-inset-bottom, 0px));
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  width: 52px; height: 52px; border-radius: 50%; background: var(--color-primary); color: #fff;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15); font-size: 10px; font-weight: 600;
}
.share-ops-fab span { font-size: 20px; }
.share-ops-modal {
  position: fixed; inset: 0; z-index: 450; background: rgba(0,0,0,0.5);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.share-ops-modal__panel {
  background: var(--color-surface); border-radius: var(--radius); padding: 24px;
  max-width: 360px; width: 100%; position: relative;
}
.share-ops-modal__close {
  position: absolute; right: 8px; top: 8px; width: 32px; height: 32px; border-radius: 50%;
  background: var(--color-bg-alt); font-size: 20px;
}
.share-ops-modal__desc { font-size: 14px; color: var(--color-text-secondary); margin: 0 0 16px; }
.share-ops-actions { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.share-ops-oa {
  display: flex; gap: 14px; align-items: center; padding-top: 16px;
  border-top: 1px solid var(--color-border); font-size: 13px;
}
.share-ops-oa strong { display: block; margin-bottom: 4px; }
.share-ops-oa p { margin: 0 0 4px; color: var(--color-text-secondary); }
.share-ops-oa small { color: var(--color-primary); }

.share-ops-block {
  margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--color-border);
  display: flex; gap: 16px; align-items: center; text-align: left;
}
.share-ops-block p { margin: 4px 0 0; font-size: 13px; color: var(--color-text-secondary); }
.share-ops-block small { color: var(--color-primary); font-size: 12px; }

/* P2 Product 3D */
.product3d-layout { max-width: 900px; }
.product3d-ui { display: grid; gap: 20px; }
.product3d-tabs { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.product3d-tab {
  padding: 8px 16px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: var(--color-bg-alt); color: var(--color-text-secondary);
}
.product3d-tab.is-active { background: var(--color-primary); color: #fff; }
.product3d-stage {
  background: var(--color-surface); border-radius: var(--radius);
  border: 1px solid var(--color-border); padding: 16px; text-align: center;
  box-shadow: var(--shadow);
}
.product3d-canvas {
  width: 100%; max-width: 420px; height: 280px; display: block; margin: 0 auto;
  cursor: grab; touch-action: none; border-radius: 8px;
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
}
.product3d-canvas:active { cursor: grabbing; }
.product3d-hint { margin: 10px 0 8px; font-size: 12px; color: var(--color-text-secondary); }
.product3d-info h3 { margin: 0 0 10px; text-align: center; }
.product3d-specs { margin: 0; padding-left: 20px; color: var(--color-text-secondary); font-size: 14px; max-width: 360px; margin-inline: auto; }
.product3d-specs li { margin-bottom: 6px; }

@media (min-width: 769px) {
  .product3d-ui { grid-template-columns: 1fr 1fr; align-items: start; }
  .product3d-tabs { grid-column: 1 / -1; }
  .product3d-info { padding-top: 24px; }
}

/* P2 FAQ */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); margin-bottom: 10px; overflow: hidden;
}
.faq-item__q {
  padding: 14px 18px; font-weight: 600; cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between;
}
.faq-item__q::-webkit-details-marker { display: none; }
.faq-item__q::after { content: '+'; color: var(--color-primary); font-size: 18px; }
.faq-item[open] .faq-item__q::after { content: '−'; }
.faq-item__a { padding: 0 18px 14px; font-size: 14px; color: var(--color-text-secondary); }

/* P2 AI Guide */
.ai-guide-panel {
  max-width: 640px; margin: 0 auto; background: var(--color-surface);
  border-radius: var(--radius); border: 1px solid var(--color-border);
  box-shadow: var(--shadow); overflow: hidden;
}
.ai-guide-messages {
  height: 260px; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px;
  background: var(--color-bg-alt);
}
.ai-guide-msg {
  max-width: 88%; padding: 10px 14px; border-radius: 12px; font-size: 14px; line-height: 1.5;
}
.ai-guide-msg--bot {
  align-self: flex-start; background: var(--color-surface);
  border: 1px solid var(--color-border); color: var(--color-text);
}
.ai-guide-msg--user {
  align-self: flex-end; background: var(--color-primary); color: #fff;
}
.ai-guide-msg a { color: var(--color-primary); text-decoration: underline; }
.ai-guide-msg--bot a { color: var(--color-primary); }
.ai-guide-quick {
  display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 16px 0;
  border-top: 1px solid var(--color-border);
}
.ai-guide-chip {
  padding: 6px 12px; border-radius: 999px; font-size: 12px;
  background: var(--color-bg-alt); color: var(--color-text-secondary);
}
.ai-guide-chip:hover { background: var(--color-primary); color: #fff; }
.ai-guide-form {
  display: flex; gap: 8px; padding: 12px 16px 16px;
}
.ai-guide-form input {
  flex: 1; padding: 10px 12px; border: 1px solid var(--color-border);
  border-radius: 8px; background: var(--color-bg);
}
.ai-guide-form input:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
}

@media (max-width: 768px) {
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr !important; }
  .contact-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
  .industry-panel { grid-template-columns: 1fr; }
  .inquiry-widget { right: 10px; }
  .share-ops-fab { left: 10px; }
  .product3d-canvas { height: 220px; }
}