/* ============================================
   AI Advanced Solutions - Base Styles
   ============================================ */

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

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

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-gray-600);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-gray-800);
}

h1 { font-size: var(--text-6xl); }
h2 { font-size: var(--text-5xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
}

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

strong {
  font-weight: var(--font-semibold);
}

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

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

/* Section */
.section {
  padding: var(--section-py) 0;
}

.section--white { background-color: var(--color-white); }
.section--gray { background-color: var(--color-gray-50); }
.section--dark {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: rgba(255, 255, 255, 0.85);
}
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-white);
}

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

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

.section__eyebrow {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section__eyebrow--light {
  color: var(--color-accent);
}

.section__title {
  margin-bottom: var(--space-4);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-500);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
}

.section--dark .section__subtitle {
  color: rgba(255, 255, 255, 0.7);
}

/* 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-family);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: 1.5;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-secondary--dark {
  color: var(--color-primary);
  border-color: var(--color-gray-300);
}

.btn-secondary--dark:hover {
  border-color: var(--color-primary);
  background-color: var(--color-gray-50);
  color: var(--color-primary);
}

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

.btn-text {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-accent);
  font-weight: var(--font-semibold);
  font-size: var(--text-base);
  text-decoration: none;
  transition: gap var(--transition-base);
}

.btn-text:hover {
  gap: var(--space-3);
  color: var(--color-accent-hover);
}

.btn-text svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
}

/* Animations */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-animate-stagger] > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

[data-animate-stagger].is-visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: translateY(0); }
[data-animate-stagger].is-visible > *:nth-child(2) { transition-delay: 100ms; opacity: 1; transform: translateY(0); }
[data-animate-stagger].is-visible > *:nth-child(3) { transition-delay: 200ms; opacity: 1; transform: translateY(0); }
[data-animate-stagger].is-visible > *:nth-child(4) { transition-delay: 300ms; opacity: 1; transform: translateY(0); }
[data-animate-stagger].is-visible > *:nth-child(5) { transition-delay: 400ms; opacity: 1; transform: translateY(0); }
[data-animate-stagger].is-visible > *:nth-child(6) { transition-delay: 500ms; opacity: 1; transform: translateY(0); }

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