/* ==========================================================================
   SEVEN STARS LOGISTICS - BASE STYLES & RESET
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
  max-width: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-body);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-blue-700);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  z-index: var(--z-modal);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top var(--transition-fast);
}

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

/* Focus States */
:focus-visible {
  outline: 2px solid var(--color-blue-600);
  outline-offset: 3px;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--primary-900);
  font-weight: var(--fw-bold);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: var(--fw-extrabold);
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.375rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h4 {
  font-size: 1.125rem;
  font-weight: var(--fw-semibold);
}

p {
  margin-bottom: 1rem;
}

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

a {
  color: var(--color-blue-700);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--color-blue-600);
}

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

ul, ol {
  list-style: none;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Section Spacing */
.section {
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-4xl);
  position: relative;
}

.section-sm {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

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

.section-bg-dark {
  background-color: var(--primary-900);
  color: var(--text-on-dark);
}

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

/* Section Header Typography */
.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header.text-center {
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.section-header.text-center .eyebrow {
  justify-content: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-blue-700);
  margin-bottom: 0.625rem;
  padding: 0.2rem 0.6rem;
  background-color: var(--color-blue-50);
  border-left: 3px solid var(--color-blue-700);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.section-header.text-center .eyebrow {
  border-left: none;
  border-bottom: 2px solid var(--color-blue-700);
  border-radius: 0;
  padding: 0.2rem 0.5rem;
}

.eyebrow-accent {
  color: var(--primary-900);
  background-color: #f1f5f9;
  border-color: var(--color-blue-700);
}

.eyebrow-light {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.12);
  border-color: #ffffff;
}

.section-title {
  color: var(--primary-900);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.875rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.section-bg-dark .section-subtitle {
  color: var(--text-light);
}

/* Helper Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.bold { font-weight: var(--fw-bold); }
.muted { color: var(--text-muted); }
.nowrap { white-space: nowrap; }

/* Grid Helpers */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Flex Helpers */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.items-center { align-items: center; }
.gap-sm { gap: 0.5rem; }
.gap-md { gap: 1rem; }
.gap-lg { gap: 1.5rem; }

/* Screen Reader Only Utility */
.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;
}

/* Reduced Motion Respect */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}