/**
 * BusinessDoctor Base Stylesheet
 * CSS Reset, Typography, Global Container & Layout Hierarchy
 */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-background);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

/* Headings with Executive Authority */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.4rem, 4.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.85rem, 3.2vw, 2.65rem);
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1.25rem;
}

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

.lead {
  font-size: clamp(1.1rem, 1.35vw, 1.3rem);
  line-height: 1.6;
  color: var(--color-text);
}

a {
  color: var(--color-teal-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-teal-500);
}

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

ul, ol {
  list-style: none;
}

/* Container Structure */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

.container-narrow {
  max-width: var(--container-narrow);
}

.container-wide {
  max-width: var(--container-wide);
}

/* Section Spacing */
.section {
  padding-top: 6rem;
  padding-bottom: 6rem;
  position: relative;
}

.section-dark {
  background-color: var(--color-obsidian);
  color: var(--color-slate-400);
}

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

.section-header {
  margin-bottom: 4rem;
}

.section-header.text-center {
  text-align: center;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  margin-top: 0.75rem;
  margin-bottom: 1rem;
}

/* Diagnostic & Clinical Badge Pills */
.pill-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  background: rgba(217, 183, 184, 0.12);
  color: var(--color-highlight);
  border: 1px solid rgba(217, 183, 184, 0.25);
  background: var(--color-teal-100);
  color: var(--color-teal-600);
  border: 1px solid rgba(161, 126, 145, 0.25);
}

.pill-tag.dark {
  background: rgba(161, 126, 145, 0.15);
  color: var(--color-teal-400);
  border-color: rgba(217, 183, 184, 0.4);
}

.pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

/* Text Highlights */
.text-teal {
  color: var(--color-teal-600);
}

.text-teal-bright {
  color: var(--color-teal-400);
}

.text-muted {
  color: var(--color-slate-500);
}

.font-mono {
  font-family: var(--font-mono);
}

/* Micro-Border Layout Elements */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(161, 126, 145, 0.35);
}

/* Accessibility */
.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;
}