/* ==========================================================================
   Base Styles & Reset
   Huayi Medical Technology × MENGROU CARE
   Phase 3.1 Hardened
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-body);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility: Skip Links & Focus Ring */
.skip-link {
  position: absolute;
  top: -999px;
  left: 1rem;
  background: var(--color-brand-primary);
  color: #FFFFFF;
  padding: 0.75rem 1.25rem;
  z-index: 9999;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  font-size: 0.95rem;
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-brand-secondary);
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  padding-left: 1.25rem;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

.container-reading {
  width: 100%;
  max-width: var(--container-reading-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

/* Section Wrapper */
.section {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.section-bg-secondary {
  background-color: var(--color-bg-secondary);
}

.section-bg-dark {
  background-color: var(--color-brand-primary);
  color: var(--color-text-on-dark);
}

.section-bg-dark h1,
.section-bg-dark h2,
.section-bg-dark h3,
.section-bg-dark h4 {
  color: var(--color-text-on-dark);
}

.section-bg-dark p {
  color: var(--color-text-on-dark-secondary);
}

.section-header {
  margin-bottom: var(--space-8);
  text-align: center;
}

.section-header.text-left {
  text-align: left;
}

.section-eyebrow {
  display: inline-block;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-brand-secondary);
  background-color: var(--color-bg-tertiary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-2);
}

.section-title {
  font-size: var(--font-size-h2);
  margin-bottom: var(--space-2);
}

.section-desc {
  font-size: var(--font-size-body-large);
  color: var(--color-text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.section-header.text-left .section-desc {
  margin-left: 0;
}

/* Review Mode & Verified Status Tags */
.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-mono);
  line-height: 1.3;
}

.status-placeholder {
  background-color: #FEF3C7;
  color: #92400E;
  border: 1px dashed #D97706;
}

.status-verified {
  background-color: #DCFCE7;
  color: #14532D;
  border: 1px solid #86EFAC;
}

/* Control review tags display: In clean mode, suppress status tags, review notes, and toggle badge */
body:not(.prototype-review-mode) .status-tag,
body.clean-review-mode .status-tag,
body.clean-review-mode .review-only,
body.clean-review-mode .review-mode-toggle-badge {
  display: none !important;
}

/* Review Mode Switcher Float Badge */
.review-mode-toggle-badge {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  background: var(--color-brand-primary);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 9999;
  cursor: pointer;
  backdrop-filter: blur(8px);
}

.review-mode-toggle-badge:hover {
  background: var(--color-brand-primary-hover);
}

/* Warm Tone and Brand Wave Background Motifs */
.section-bg-warm-tint {
  background-color: var(--color-bg-warm-tint);
}

.care-wave-divider {
  width: 100%;
  overflow: hidden;
  line-height: 0;
}

.care-wave-divider svg {
  position: relative;
  display: block;
  width: calc(100% + 1.3px);
  height: 48px;
}

/* Utility Helpers */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }