/* ============================================
   OrderShield — Base Styles
   Reset, typography, layout primitives
   ============================================ */

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

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

body {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--color-accent-dark);
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

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

h1 {
  font-size: var(--text-5xl);
  font-weight: var(--weight-extrabold);
  letter-spacing: -0.025em;
}

h2 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
}

p {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

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

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

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

.section {
  padding: var(--space-20) 0;
}

.section--lg {
  padding: var(--space-24) 0;
}

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

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

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

.section--alt {
  background-color: var(--color-surface-alt);
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* --- Flex --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* --- Text alignment --- */
.text-center { text-align: center; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: 1;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  white-space: nowrap;
  min-height: 44px;
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-cta);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background-color: var(--color-cta-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: var(--color-primary);
}

.btn--secondary {
  background-color: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  background-color: var(--color-accent-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: #fff;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text-on-dark);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn--outline:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.btn--outline-dark {
  background-color: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
}

.btn--outline-dark:hover {
  border-color: var(--color-primary-mid);
  background-color: var(--color-surface-alt);
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  padding: var(--space-2) var(--space-3);
}

.btn--ghost:hover {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-dark);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 36px;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  min-height: 52px;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* --- Eyebrow --- */
.eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.section--dark .eyebrow {
  color: var(--color-cta);
}

/* --- Cards --- */
.card {
  background-color: var(--color-card);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-light);
  transform: translateY(-2px);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-5);
  color: var(--color-accent);
}

.card__icon svg {
  width: 24px;
  height: 24px;
}

.card__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.card__body {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- Section Header (reusable) --- */
.section-header {
  margin-bottom: var(--space-12);
}

.section-header--centered {
  text-align: center;
  max-width: var(--max-width-text);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-12);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--text-lg);
  max-width: 640px;
}

.section-header--centered p {
  margin-left: auto;
  margin-right: auto;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }

  .section { padding: var(--space-16) 0; }
  .section--lg { padding: var(--space-20) 0; }

  .grid--4,
  .grid--3,
  .grid--2 { grid-template-columns: 1fr; }

  .container { padding: 0 var(--space-5); }
}

@media (max-width: 480px) {
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
}

/* --- Scroll Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --- Skip Link (a11y) --- */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--space-4);
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
  font-size: var(--text-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
  color: #fff;
}

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