/* ============================================
   DESIGN SYSTEM — Solcio Brand "Data Architect"
   Based on DESIGN.md and original styles
   ============================================ */

:root {
  /* Color Palette — The Data Architect */
  --color-primary: #00113a; /* Deep Navy */
  --color-primary-container: #002366;
  --color-primary-fixed: #dbe1ff;
  --color-primary-dim: #b3c5ff;

  --color-secondary: #64748B; /* Slate Silver */
  --color-secondary-container: #F1F5F9;
  --color-secondary-dim: #94A3B8;

  --color-tertiary: #1d1300; /* Amber */
  --color-tertiary-container: #362600;
  --color-tertiary-fixed-dim: #fbbc00;

  --color-error: #ba1a1a;
  --color-error-container: #ffdad6;

  /* Surfaces */
  --surface: #fbf8fe; /* Base background */
  --surface-container-lowest: #ffffff; /* Cards / Focus Areas */
  --surface-container-low: #f6f2f8; /* Sectioning / Alternating Rows */
  --surface-container: #f0edf2;
  --surface-container-high: #eae7ed;
  --surface-container-highest: #e4e1e7; /* High Interaction */

  /* Text & On-Colors */
  --on-surface: #1b1b1f;
  --on-surface-variant: #444650;
  --outline: #757682;
  --outline-variant: #c5c6d2;

  --on-primary: #ffffff;
  --on-primary-container: #758dd5;
  --on-secondary: #ffffff;
  --on-secondary-container: #334155;
  --on-tertiary-fixed: #261a00;

  /* Typography */
  --font-display: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows */
  --shadow-ambient: 0 4px 32px rgba(27, 27, 31, 0.04), 0 1px 2px rgba(27, 27, 31, 0.02);
  --shadow-hover: 0 12px 48px rgba(27, 27, 31, 0.06), 0 4px 12px rgba(27, 27, 31, 0.03);
  --shadow-teal: 0 8px 32px rgba(100, 116, 139, 0.25);
  --shadow-amber: 0 8px 32px rgba(251, 188, 0, 0.3);

  /* Borders / Radii */
  /* Ghost border: outline-variant at 20% opacity = rgba(197, 198, 210, 0.2) */
  --ghost-border: 1px solid rgba(197, 198, 210, 0.2);
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility: Focus and Motion */
:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

::selection {
  background-color: var(--color-secondary-container);
  color: var(--on-secondary-container);
}

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

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

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

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6, .font-display {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-display-lg { font-size: clamp(3rem, 5vw + 1rem, 4.5rem); letter-spacing: -0.03em; }
.text-headline-lg { font-size: clamp(2rem, 3vw + 1rem, 2.5rem); }
.text-headline-md { font-size: 1.5rem; }
.text-body-lg { font-size: 1.125rem; }
.text-body-md { font-size: 1rem; color: var(--on-surface-variant); }
.text-label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* ============================================
   LAYOUT / CONTAINERS
   ============================================ */
.container {
  max-width: 80rem; /* 1280px */
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}
.section-large {
  padding: 8rem 0;
}

.grid-cols-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

@media (max-width: 1024px) {
  .lg-col-span-12 { grid-column: span 12; }
  .grid-cols-3, .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4, .grid-cols-12 { grid-template-columns: 1fr; }
  .md-col-span-12 { grid-column: span 1 !important; }
  section { padding: 4rem 0; }
  .section-large { padding: 5rem 0; }
}

/* ============================================
   SURFACES & LAYER DEPTH
   ============================================ */
.bg-surface { background-color: var(--surface); }
.bg-surface-low { background-color: var(--surface-container-low); }
.bg-surface-lowest { background-color: var(--surface-container-lowest); }
.bg-primary { background-color: var(--color-primary); color: var(--on-primary); }
.bg-primary-container { background-color: var(--color-primary-container); color: var(--on-primary); }

.card {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
  border: var(--ghost-border);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.glass-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: var(--shadow-ambient);
}

.hero-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-container) 100%);
}

/* ============================================
   COMPONENTS
   ============================================ */
/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition-fast);
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-container) 100%);
  color: var(--on-primary);
  box-shadow: 0 4px 14px rgba(0, 17, 58, 0.15);
}
.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 17, 58, 0.2);
}
.btn-secondary {
  background: var(--surface-container-highest);
  color: var(--color-primary);
}
.btn-secondary:hover {
  background: var(--surface-container-high);
}
.btn-cta {
  background: var(--color-tertiary-fixed-dim);
  color: var(--on-tertiary-fixed);
  box-shadow: var(--shadow-amber);
}
.btn-cta:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 40px rgba(251, 188, 0, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--outline-variant);
}
.btn-outline:hover {
  background-color: var(--surface-container-low);
}
.btn-outline-white {
  background: transparent;
  color: var(--on-primary);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.btn-outline-white:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Chips / Tags */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  background-color: var(--surface-container-low);
  color: var(--color-primary);
}
.chip-amber {
  background-color: rgba(251, 188, 0, 0.15);
  border: 1px solid rgba(251, 188, 0, 0.3);
  color: var(--color-tertiary-container);
}

/* Navigation */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background-color: rgba(251, 248, 254, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-medium);
}
.nav-header.scrolled {
  background-color: rgba(251, 248, 254, 0.95);
  border-bottom: var(--ghost-border);
  box-shadow: var(--shadow-ambient);
}
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}
.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-primary);
  letter-spacing: -0.05em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav-link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  transition: color var(--transition-fast);
}
.nav-link:hover { color: var(--color-primary-container); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 101;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: all 0.3s;
}

@media (max-width: 900px) {
  .hamburger { display: flex; }
  .nav-menu {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--surface);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-medium);
    pointer-events: none;
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-menu .nav-links {
    flex-direction: column;
  }
}

/* Interactivity: Accordion (FAQ) */
.faq-item {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: background-color var(--transition-fast);
}
.faq-item:hover {
  background-color: rgba(246, 242, 248, 0.5); /* low surface with opacity */
}
.faq-button {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--color-primary);
  font-weight: 700;
  text-align: left;
}
.faq-button .icon {
  transition: transform var(--transition-medium);
  color: var(--on-surface-variant);
}
.faq-button[aria-expanded="true"] .icon {
  transform: rotate(180deg);
}
.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow), opacity var(--transition-slow);
  opacity: 0;
  padding: 0 1.5rem;
  color: var(--on-surface-variant);
}
.faq-button[aria-expanded="true"] + .faq-content {
  max-height: 500px;
  padding-bottom: 1.5rem;
  opacity: 1;
}

/* Bilingual Engine */
.es { display: none; }
body.lang-es .en { display: none; }
body.lang-es .es { display: inline; }
.lang-toggle {
  display: flex;
  background: var(--surface-container-highest);
  border-radius: var(--radius-full);
  padding: 0.25rem;
}
.lang-toggle button {
  padding: 0.25rem 0.75rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.75rem;
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
  transition: all var(--transition-fast);
}
.lang-toggle button.active {
  background: var(--color-primary);
  color: var(--on-primary);
}

/* Helper Classes */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.gap-8 { gap: 2rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.relative { position: relative; }
.absolute { position: absolute; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.object-cover { object-fit: cover; }
.rounded-full { border-radius: var(--radius-full); }
.overflow-hidden { overflow: hidden; }
.z-10 { z-index: 10; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Micro animations / Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s cubic-bezier(0.5, 0, 0, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* SR Only 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-width: 0;
}