/*
 * NFBABY Visual Framework V1
 * Shared design tokens and low-level components.
 * Business content and Z-Blog behavior intentionally remain untouched.
 */

:root {
  /* Brand palette */
  --nf-color-ink: #17343d;
  --nf-color-ink-soft: #49636b;
  --nf-color-blue: #356f91;
  --nf-color-blue-deep: #245c7a;
  --nf-color-teal: #4b8b82;
  --nf-color-teal-deep: #34756d;
  --nf-color-warm: #c48f67;
  --nf-color-mist: #f3f7f7;
  --nf-color-surface: #ffffff;
  --nf-color-line: #dce7e8;
  --nf-color-line-strong: #c8d9dc;
  --nf-color-success: #3f8175;

  /* Typography */
  --nf-font-sans: "Avenir Next", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  --nf-font-display: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  --nf-text-xs: 12px;
  --nf-text-sm: 14px;
  --nf-text-base: 16px;
  --nf-text-md: 18px;
  --nf-text-lg: 24px;
  --nf-text-xl: 34px;
  --nf-text-2xl: 46px;
  --nf-leading-tight: 1.25;
  --nf-leading-normal: 1.7;
  --nf-leading-reading: 1.9;

  /* Layout and rhythm */
  --nf-container: 1240px;
  --nf-reading: 820px;
  --nf-space-1: 4px;
  --nf-space-2: 8px;
  --nf-space-3: 12px;
  --nf-space-4: 16px;
  --nf-space-5: 20px;
  --nf-space-6: 24px;
  --nf-space-8: 32px;
  --nf-space-10: 40px;
  --nf-space-12: 48px;
  --nf-space-16: 64px;
  --nf-space-20: 80px;
  --nf-space-24: 96px;

  /* Shape and elevation */
  --nf-radius-sm: 8px;
  --nf-radius-md: 14px;
  --nf-radius-lg: 22px;
  --nf-radius-pill: 999px;
  --nf-shadow-sm: 0 8px 24px rgba(26, 67, 78, 0.07);
  --nf-shadow-md: 0 18px 50px rgba(26, 67, 78, 0.1);
  --nf-shadow-hover: 0 22px 56px rgba(26, 67, 78, 0.15);
  --nf-transition: 220ms cubic-bezier(0.2, 0.65, 0.3, 1);
}

html.nf-v1 {
  color: var(--nf-color-ink);
  background: var(--nf-color-surface);
  font-family: var(--nf-font-sans);
  line-height: var(--nf-leading-normal);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.nf-v1 *,
.nf-v1 *::before,
.nf-v1 *::after {
  box-sizing: border-box;
}

.nf-v1 body {
  min-height: 100%;
  margin: 0;
  color: var(--nf-color-ink);
  background: var(--nf-color-surface);
  font-family: var(--nf-font-sans);
  font-size: var(--nf-text-base);
  line-height: var(--nf-leading-normal);
}

.nf-v1 img {
  max-width: 100%;
}

.nf-v1 a {
  color: inherit;
  text-decoration: none;
  transition: color var(--nf-transition), background-color var(--nf-transition), border-color var(--nf-transition), box-shadow var(--nf-transition), transform var(--nf-transition);
}

.nf-v1 button,
.nf-v1 input,
.nf-v1 textarea,
.nf-v1 select {
  font: inherit;
}

.nf-v1 button,
.nf-v1 summary {
  -webkit-tap-highlight-color: transparent;
}

.nf-v1 :focus-visible {
  outline: 3px solid rgba(53, 111, 145, 0.32);
  outline-offset: 3px;
}

.nf-v1 .container,
.nf-v1 .nf-container {
  width: min(calc(100% - 48px), var(--nf-container));
  margin-right: auto;
  margin-left: auto;
}

.nf-v1 .nf-section {
  padding-top: var(--nf-space-20);
  padding-bottom: var(--nf-space-20);
}

.nf-v1 .nf-section--soft {
  background: var(--nf-color-mist);
}

.nf-v1 .nf-eyebrow {
  margin: 0 0 var(--nf-space-3);
  color: var(--nf-color-teal-deep);
  font-size: var(--nf-text-xs);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nf-v1 .nf-heading {
  margin: 0;
  color: var(--nf-color-ink);
  font-family: var(--nf-font-display);
  font-size: clamp(28px, 3.2vw, 44px);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: var(--nf-leading-tight);
}

.nf-v1 .nf-lead {
  max-width: 680px;
  margin: var(--nf-space-5) auto 0;
  color: var(--nf-color-ink-soft);
  font-size: var(--nf-text-md);
  line-height: 1.8;
}

.nf-v1 .nf-card {
  overflow: hidden;
  border: 1px solid var(--nf-color-line);
  border-radius: var(--nf-radius-lg);
  background: var(--nf-color-surface);
  box-shadow: var(--nf-shadow-sm);
  transition: border-color var(--nf-transition), box-shadow var(--nf-transition), transform var(--nf-transition);
}

.nf-v1 .nf-card:hover {
  border-color: var(--nf-color-line-strong);
  box-shadow: var(--nf-shadow-hover);
  transform: translateY(-4px);
}

.nf-v1 .nf-button,
.nf-v1 .nf-button--ghost {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: var(--nf-space-2);
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--nf-radius-pill);
  font-size: var(--nf-text-sm);
  font-weight: 650;
  line-height: 1.4;
  cursor: pointer;
}

.nf-v1 .nf-button {
  color: #fff;
  border-color: var(--nf-color-blue);
  background: var(--nf-color-blue);
  box-shadow: 0 8px 20px rgba(53, 111, 145, 0.2);
}

.nf-v1 .nf-button:hover {
  border-color: var(--nf-color-blue-deep);
  background: var(--nf-color-blue-deep);
  transform: translateY(-2px);
}

.nf-v1 .nf-button--ghost {
  color: var(--nf-color-blue-deep);
  border-color: var(--nf-color-line-strong);
  background: rgba(255, 255, 255, 0.78);
}

.nf-v1 .nf-button--ghost:hover {
  border-color: var(--nf-color-blue);
  background: var(--nf-color-surface);
}

.nf-v1 .nf-divider {
  height: 1px;
  border: 0;
  background: var(--nf-color-line);
}

.nf-v1 .nf-reading {
  width: min(100%, var(--nf-reading));
  margin-right: auto;
  margin-left: auto;
  font-size: 17px;
  line-height: var(--nf-leading-reading);
}

.nf-v1 .nf-sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (max-width: 767px) {
  :root {
    --nf-text-base: 15px;
    --nf-text-md: 17px;
    --nf-space-16: 48px;
    --nf-space-20: 60px;
    --nf-space-24: 72px;
    --nf-radius-lg: 18px;
  }

  .nf-v1 .container,
  .nf-v1 .nf-container {
    width: min(calc(100% - 32px), var(--nf-container));
  }

  .nf-v1 .nf-card:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nf-v1,
  .nf-v1 *,
  .nf-v1 *::before,
  .nf-v1 *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}