/**
 * Linear design system — see DESIGN.md
 * Load after styles.css; overrides legacy visual layer without changing HTML/JS contracts.
 */

@import url("https://fonts.googleapis.com/css2?family=Inter:opsz,wght@14..32,400..600&family=JetBrains+Mono:wght@400;500&display=swap");

/* —— Design tokens (dark default) —— */
:root {
  color-scheme: dark;

  --canvas: #08090a;
  --surface-panel: #16171c;
  --surface-raised: #1e1f25;
  --surface-overlay: #26272e;
  --text-primary: #f7f8f8;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --accent: #5e6ad2;
  --accent-hover: #7170ff;
  --accent-muted: #828fff;
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.08);
  --code-bg: #1e1f25;
  --code-text: #a78bfa;
  --shadow-elevate: 0 1px 2px rgba(0, 0, 0, 0.3);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 40px;
  --space-7: 64px;
  --space-8: 96px;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 16px;

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --ease-out: 150ms ease-out;
  --ease-layout: 400ms cubic-bezier(0.22, 1, 0.36, 1);

  /* Legacy aliases */
  --bg: var(--canvas);
  --bg-soft: var(--canvas);
  --bg-deep: var(--surface-raised);
  --surface: var(--surface-raised);
  --surface-strong: var(--surface-panel);
  --surface-soft: var(--surface-raised);
  --surface-dark: var(--canvas);
  --surface-dark-soft: var(--surface-panel);
  --text: var(--text-primary);
  --muted: var(--text-secondary);
  --line: var(--border);
  --line-strong: var(--border-strong);
  --primary: var(--accent);
  --primary-strong: var(--accent-hover);
  --secondary: var(--accent-muted);
  --accent-legacy: var(--accent-muted);
  --shadow: var(--shadow-elevate);
  --shadow-soft: var(--shadow-elevate);
  --container: min(1120px, calc(100vw - var(--space-4) * 2));
  --nav-max: 1024px;
  --nav-float-bg: rgba(8, 9, 10, 0.7);
  --nav-float-bg-scrolled: rgba(8, 9, 10, 0.82);
  --font-weight-ui: 500;
  --font-weight-subhead: 600;
  --font-weight-display: 600;
  --text-xs: 11px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 16px;
  --text-lg: 18px;
  --text-xl: 22px;
  --text-2xl: 28px;
  --text-3xl: 36px;
  --text-4xl: 48px;
  --text-5xl: 64px;
  --tracking-display: -0.022em;
  --tracking-title: -0.012em;
  --tracking-body: -0.011em;
  --tracking-ui: -0.01em;
  --tracking-eyebrow: 0.4px;
}

[data-theme="light"] {
  color-scheme: light;
  --nav-float-bg: rgba(255, 255, 255, 0.78);
  --nav-float-bg-scrolled: rgba(255, 255, 255, 0.92);
  --canvas: #ffffff;
  --surface-panel: #f9fafb;
  --surface-raised: #f3f4f6;
  --surface-overlay: #e5e7eb;
  --text-primary: #08090a;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border: rgba(0, 0, 0, 0.06);
  --border-strong: rgba(0, 0, 0, 0.08);
  --code-bg: #f3f4f6;
  --code-text: #6d28d9;
  --shadow-elevate: 0 1px 2px rgba(0, 0, 0, 0.06);

  --bg: var(--canvas);
  --bg-soft: var(--canvas);
  --surface-strong: var(--surface-panel);
  --text: var(--text-primary);
  --muted: var(--text-secondary);
}

/* —— Global reset (visual noise off) —— */
body::before,
body::after,
.site-shell::before,
.site-shell::after,
.page-main::before,
.page-main::after,
.page-hero::after,
.page-hero::before,
.client-strip-grid::before,
.solution-banner::before,
.cta-band::before,
.banner-slide::before,
.banner-carousel::after,
.banner-carousel::before,
.detail-media-card::before,
.scene-panel::after,
.scene-panel::before,
.nephrology-highlight::after {
  display: none !important;
  animation: none !important;
  content: none !important;
}

body {
  font-family: var(--font-sans);
  font-feature-settings: "cv01", "ss03";
  font-size: var(--text-base);
  font-weight: var(--font-weight-ui);
  line-height: 1.5;
  letter-spacing: var(--tracking-body);
  color: var(--text-primary);
  background: var(--canvas) !important;
}

.site-shell {
  padding-top: 56px;
}

body.is-nav-overlay .page-main,
body.is-nav-overlay .site-footer {
  opacity: var(--motion-nav-dim, 0.42);
  transition: opacity 180ms ease-out;
  pointer-events: none;
}

body.is-nav-overlay .site-header {
  opacity: 1;
  pointer-events: auto;
}

.is-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

code,
.kbd {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.12em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.kbd {
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* —— Full-width header / nav (content aligned to --container) —— */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--nav-float-bg) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border) !important;
  transition:
    background 180ms ease-out,
    border-color 180ms ease-out,
    backdrop-filter 180ms ease-out;
  pointer-events: auto;
}

.site-header.is-scrolled {
  background: var(--nav-float-bg-scrolled) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border-strong) !important;
}

.nav-dock {
  width: var(--container);
  max-width: 100%;
  margin: 0 auto;
}

.nav-dock-inner,
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 56px;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.brand-compact {
  flex-shrink: 0;
}

.brand-mark {
  width: 28px !important;
  height: 28px !important;
  border-radius: var(--radius-sm) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--text-xs) !important;
  font-weight: var(--font-weight-display) !important;
  letter-spacing: var(--tracking-ui) !important;
  background: var(--accent) !important;
  box-shadow: none !important;
}

@media (min-width: 981px) {
  .site-nav {
    display: flex !important;
  }
}

.site-nav {
  align-items: center;
  gap: 22px;
  margin-left: auto;
  margin-right: auto;
}

.site-nav a,
.nav-dropdown-trigger {
  position: relative;
  padding: 6px 0;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-ui);
  letter-spacing: var(--tracking-ui);
  color: var(--text-secondary) !important;
  transition: color 150ms ease-out;
  background: none;
  border: 0;
  cursor: pointer;
  font-family: inherit;
}

.site-nav a::after,
.nav-link-underline::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 1px;
  background: var(--text-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 150ms ease-out;
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.site-nav a:hover,
.site-nav a.is-active,
.nav-dropdown-trigger:hover,
.nav-dropdown-trigger.is-active {
  color: var(--text-primary) !important;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.6;
}

.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 2px);
  left: 50%;
  transform: translate3d(-50%, var(--motion-dropdown-y, -4px), 0);
  min-width: 220px;
  padding: var(--space-2);
  background: var(--surface-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-elevate);
  z-index: 60;
}

/* 透明桥接：鼠标从「解决方案」移向菜单时不会经过 hover 死区 */
.nav-dropdown-panel::before {
  content: "";
  position: absolute;
  left: -12px;
  right: -12px;
  top: -16px;
  height: 16px;
  background: transparent;
}

.nav-dropdown-panel a {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--text-secondary) !important;
  transition: background 150ms ease-out, color 150ms ease-out;
}

.nav-dropdown-panel a::after {
  display: none;
}

.nav-dropdown-panel a:hover {
  background: var(--surface-raised);
  color: var(--text-primary) !important;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

.header-login {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-ui);
  letter-spacing: var(--tracking-ui);
  color: var(--text-secondary);
  transition: color 150ms ease-out;
}

.header-login:hover,
.header-login.is-active {
  color: var(--text-primary);
}

.header-cta {
  min-height: 32px !important;
  padding: 0 12px !important;
  border-radius: var(--radius-sm) !important;
  font-size: var(--text-sm) !important;
  font-weight: var(--font-weight-ui) !important;
  background: var(--accent) !important;
  color: #fff !important;
  border: 1px solid transparent !important;
  box-shadow: none !important;
  transition: background 150ms ease-out, transform 120ms ease-out;
}

.header-cta:hover {
  background: var(--accent-hover) !important;
}

.theme-toggle {
  border-radius: var(--radius-sm) !important;
  padding: var(--space-1) var(--space-2) !important;
  background: var(--surface-panel) !important;
  border: 1px solid var(--border) !important;
  box-shadow: none !important;
}

.theme-toggle-track {
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
  width: 44px;
  height: 24px;
}

.theme-toggle-thumb {
  width: 18px;
  height: 18px;
  box-shadow: none !important;
  background: var(--surface-overlay) !important;
  transition: transform var(--ease-layout);
}

[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(20px);
}

.nav-toggle {
  border-radius: var(--radius-sm) !important;
  background: var(--surface-panel) !important;
  border: 1px solid var(--border) !important;
}

/* —— Typography —— */
.eyebrow {
  font-family: var(--font-sans) !important;
  font-size: var(--text-sm) !important;
  font-weight: var(--font-weight-ui) !important;
  letter-spacing: var(--tracking-eyebrow) !important;
  text-transform: uppercase;
  color: var(--text-secondary) !important;
  margin-bottom: var(--space-3) !important;
}

.eyebrow::before {
  display: none !important;
}

.page-hero-copy h1,
.hero-copy h1,
.banner-copy h1 {
  letter-spacing: var(--tracking-display);
  font-weight: var(--font-weight-display);
  color: var(--text-primary);
  font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl)) !important;
  line-height: 1.2 !important;
  max-width: 14ch;
}

.section-heading h2 {
  letter-spacing: var(--tracking-title);
  font-weight: var(--font-weight-subhead);
  font-size: clamp(var(--text-xl), 3.2vw, var(--text-2xl)) !important;
  line-height: 1.25 !important;
  color: var(--text-primary);
}

.page-hero-copy p,
.hero-description,
.banner-description,
.section-heading p {
  font-size: var(--text-md) !important;
  line-height: 1.5 !important;
  letter-spacing: var(--tracking-body);
  color: var(--text-secondary) !important;
  max-width: 680px;
}

.page-hero {
  padding: var(--space-8) 0 var(--space-7) !important;
}

.home-hero {
  padding-top: var(--space-7) !important;
}

.section {
  padding: var(--space-8) 0 !important;
}

.banner-copy .hero-actions {
  margin-top: var(--space-6) !important;
}

.banner-description {
  margin-top: var(--space-5) !important;
}

/* —— Buttons —— */
.button {
  min-height: 36px !important;
  padding: 0 var(--space-4) !important;
  border-radius: var(--radius-sm) !important;
  font-size: 0.875rem !important;
  font-weight: 500 !important;
  transition: background var(--ease-out), border-color var(--ease-out), color var(--ease-out) !important;
}

.button:hover {
  transform: none !important;
}

.button-primary {
  background: var(--accent) !important;
  color: #fff !important;
  box-shadow: none !important;
}

.button-primary:hover {
  background: var(--accent-hover) !important;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.02) !important;
  border: 1px solid var(--border) !important;
  color: var(--text-primary) !important;
}

[data-theme="light"] .button-secondary {
  background: rgba(0, 0, 0, 0.02) !important;
}

.card-link {
  min-height: 32px !important;
  border-radius: var(--radius-sm) !important;
  font-size: 0.8125rem !important;
  font-weight: 500 !important;
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
  box-shadow: none !important;
  transition: background var(--ease-out), border-color var(--ease-out);
}

.card-link:hover {
  border-color: var(--border-strong) !important;
  background: var(--surface-overlay) !important;
}

/* —— Cards & surfaces —— */
.panel-card,
.feature-card,
.stat-card,
.solution-preview-card,
.product-card,
.scenario-card,
.timeline-step,
.case-study-card,
.ability-card,
.about-panel,
.contact-card,
.map-panel,
.form-panel,
.topic-card,
.module-item,
.detail-kpi-card,
.scope-card,
.story-card,
.float-card,
.summary-card,
.visual-card,
.banner-capability-card,
.client-strip-grid,
.detail-media-card,
.architecture-stage,
.nephrology-module-card {
  border-radius: var(--radius-md) !important;
  background: var(--surface-panel) !important;
  border: 1px solid var(--border) !important;
  box-shadow: var(--shadow-elevate) !important;
}

.feature-card,
.nephrology-highlight,
.solution-banner,
.cta-band {
  background: var(--surface-panel) !important;
  border: 1px solid var(--border) !important;
  box-shadow: var(--shadow-elevate) !important;
}

.section-dark {
  background: var(--canvas) !important;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-dark .panel-card,
.section-dark .case-study-card,
.section-dark .topic-card,
.section-dark .scenario-card {
  background: var(--surface-panel) !important;
  border-color: var(--border) !important;
  color: var(--text-primary) !important;
}

.section-dark .case-study-card p,
.section-dark .scenario-card p {
  color: var(--text-secondary) !important;
}

.section-soft {
  background: var(--surface-raised) !important;
}

/* —— Tags —— */
.page-tags span,
.tag-row span,
.tag-cloud span,
.tag-cloud a,
.client-chip,
.banner-mini-tags span,
.metric-pill,
.visual-chip-row span,
.card-tag,
.case-tag {
  min-height: 28px !important;
  padding: 0 10px !important;
  border-radius: var(--radius-sm) !important;
  font-size: 0.75rem !important;
  font-weight: 500 !important;
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
  color: var(--text-secondary) !important;
  box-shadow: none !important;
}

.card-tag,
.case-tag {
  color: var(--accent-muted) !important;
  background: color-mix(in srgb, var(--accent) 12%, var(--surface-panel)) !important;
}

.tag-cloud a:hover {
  transform: none !important;
  color: var(--text-primary) !important;
  border-color: var(--border-strong) !important;
}

/* —— Hero / banner —— */
.page-hero {
  padding: var(--space-7) 0 var(--space-6) !important;
}

.page-hero-grid {
  opacity: 0.06 !important;
  animation: none !important;
  background-size: 48px 48px !important;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 90%) !important;
}

.banner-carousel {
  min-height: auto !important;
  border-radius: var(--radius-lg) !important;
  background: var(--surface-panel) !important;
  border: 1px solid var(--border) !important;
  box-shadow: var(--shadow-elevate) !important;
  overflow: hidden;
}

.banner-slides {
  min-height: min(520px, auto) !important;
}

.banner-slide {
  position: relative !important;
  inset: auto !important;
  opacity: 1 !important;
  visibility: hidden !important;
  transform: none !important;
  padding: var(--space-6) !important;
  background: transparent !important;
  display: none !important;
}

.banner-slide.is-active {
  display: grid !important;
  visibility: visible !important;
}

.banner-copy h1 {
  color: var(--text-primary) !important;
  max-width: 16ch !important;
}

.banner-copy .eyebrow {
  color: var(--text-secondary) !important;
}

.banner-description {
  color: var(--text-secondary) !important;
}

.banner-frame,
.page-hero-visual,
.detail-media-card {
  border-radius: var(--radius-md) !important;
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
  box-shadow: none !important;
  min-height: 280px !important;
}

.banner-product-shot {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: var(--space-4) !important;
  overflow: hidden !important;
}

.banner-product-shot img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.banner-frame-network .banner-node,
.banner-frame-network .banner-link,
.banner-frame-network .banner-orbit,
.banner-grid-lines {
  display: none !important;
}

.banner-frame-capability,
.banner-frame-data {
  display: grid !important;
  gap: var(--space-3) !important;
  padding: var(--space-4) !important;
  align-content: start !important;
}

.banner-capability-card {
  background: var(--surface-panel) !important;
  color: var(--text-primary) !important;
}

.banner-controls {
  border-top: 1px solid var(--border);
  padding: var(--space-3) var(--space-5) !important;
}

.banner-arrow {
  width: 32px !important;
  height: 32px !important;
  border-radius: var(--radius-sm) !important;
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
  color: var(--text-primary) !important;
  font-size: 1.25rem !important;
}

.banner-dot {
  background: var(--surface-overlay) !important;
  border: 1px solid var(--border) !important;
}

.banner-dot.is-active {
  background: var(--accent) !important;
}

.page-hero-visual {
  background: var(--surface-panel) !important;
}

.page-hero-visual::before,
.page-hero-visual::after {
  display: none !important;
}

.visual-card {
  border-radius: var(--radius-md) !important;
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
  color: var(--text-primary) !important;
  animation: none !important;
}

.visual-card p {
  color: var(--text-secondary) !important;
}

.architecture-layer {
  border-radius: var(--radius-sm) !important;
  background: var(--surface-raised) !important;
  border: 1px solid var(--border) !important;
}

.architecture-layer strong {
  color: var(--text-primary) !important;
}

/* —— Nephrology dashboard → Linear panel —— */
.nephrology-dashboard {
  border-radius: var(--radius-lg) !important;
  background: var(--surface-panel) !important;
  border: 1px solid var(--border) !important;
  box-shadow: var(--shadow-elevate) !important;
  color: var(--text-primary) !important;
}

.nephrology-dashboard-metric strong {
  color: var(--accent-muted) !important;
  font-weight: 600 !important;
}

.nephrology-dashboard-flow span::before {
  background: var(--accent) !important;
  box-shadow: none !important;
}

.dashboard-bars span {
  background: var(--accent) !important;
  box-shadow: none !important;
  border-radius: var(--radius-sm) !important;
}

/* —— Footer —— */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--canvas) !important;
  padding: var(--space-6) 0 !important;
}

.footer-col p,
.footer-note {
  color: var(--text-secondary) !important;
  font-size: 0.8125rem;
}

/* —— Sections —— */
.section {
  padding: var(--space-7) 0 !important;
}

.feature-icon,
.card-index {
  border-radius: var(--radius-sm) !important;
  background: color-mix(in srgb, var(--accent) 14%, transparent) !important;
  color: var(--accent-muted) !important;
  font-family: var(--font-mono) !important;
  box-shadow: none !important;
}

.feature-icon {
  background: var(--accent) !important;
  color: #fff !important;
}

.solution-preview-card::before,
.product-card::before,
.topic-card::before {
  display: none !important;
}

.reveal-on-scroll {
  transition: opacity 400ms cubic-bezier(0.22, 1, 0.36, 1), transform 400ms cubic-bezier(0.22, 1, 0.36, 1) !important;
}

.case-detail-block strong {
  color: var(--accent-muted) !important;
}

.section-dark .case-detail-block strong {
  color: var(--accent-muted) !important;
}

/* —— Forms (contact) —— */
input,
select,
textarea {
  border-radius: var(--radius-sm) !important;
  border: 1px solid var(--border) !important;
  background: var(--surface-raised) !important;
  color: var(--text-primary) !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 980px) {
  .site-nav {
    display: none !important;
    position: fixed;
    inset: 0;
    z-index: 45;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-7) var(--space-5);
    margin: 0;
    border-radius: 0 !important;
    background: var(--canvas) !important;
    border: 0 !important;
    box-shadow: none !important;
  }

  .site-nav.is-open {
    display: flex !important;
  }

  .nav-dropdown-panel {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    box-shadow: none;
    border: 0;
    padding: 0 0 0 var(--space-3);
    min-width: 0;
  }

  .nav-dropdown:not(.is-open) .nav-dropdown-panel {
    display: none;
  }

  .header-tools .theme-toggle-label {
    display: none;
  }

  .section {
    padding: 72px 0 !important;
  }

  .site-shell {
    padding-top: 56px;
  }
}