/* ==========================================================================
   PORTFÓLIO PROFISSIONAL - AIRTON NETTO
   Design System & Main Stylesheet (Vanilla CSS3)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DESIGN TOKENS & CUSTOM PROPERTIES
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Technical Dark Theme */
  --bg-dark: #07090e;
  --bg-surface: #0e131f;
  --bg-surface-hover: #141c2e;
  --bg-card: #111726;
  --bg-card-alt: #161e31;
  --bg-tertiary: #1b253b;

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-focus: #06b6d4;

  /* Text & Typography */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* Brand & Accents */
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.18);
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.18);
  --accent-indigo: #6366f1;
  --accent-amber: #f59e0b;

  /* Status Colors */
  --status-concluded-bg: rgba(16, 185, 129, 0.12);
  --status-concluded-text: #34d399;
  --status-concluded-border: rgba(16, 185, 129, 0.3);

  --status-dev-bg: rgba(6, 182, 212, 0.12);
  --status-dev-text: #38bdf8;
  --status-dev-border: rgba(6, 182, 212, 0.3);

  --status-planned-bg: rgba(245, 158, 11, 0.12);
  --status-planned-text: #fbbf24;
  --status-planned-border: rgba(245, 158, 11, 0.3);

  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, Monaco, monospace;

  /* Layout & Spacing */
  --max-width: 1200px;
  --header-height: 4.5rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Shadows & Glows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-glow-cyan: 0 0 25px rgba(6, 182, 212, 0.15);
  --shadow-glow-emerald: 0 0 25px rgba(16, 185, 129, 0.15);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Light scheme fallback if explicitly requested or preferred */
@media (prefers-color-scheme: light) {
  /* Site defaults to high-contrast technical dark mode by design for engineering aesthetic */
}

/* --------------------------------------------------------------------------
   2. GLOBAL RESET & BASE STYLES
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility: Skip to Main Content Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-cyan);
  color: var(--bg-dark);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--text-primary);
}

/* Keyboard Focus Ring */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Standard Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.125rem; }

p {
  color: var(--text-secondary);
  max-width: 75ch;
  margin-bottom: 1rem;
}

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

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

a:hover {
  color: #38bdf8;
}

code, pre, kbd {
  font-family: var(--font-mono);
}

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

ul, ol {
  list-style-position: inside;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   3. LAYOUT & CONTAINERS
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-compact {
  padding: 3rem 0;
}

.main-content {
  flex: 1;
  padding-top: var(--header-height);
}

/* Grid & Flex Utilities */
.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

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

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-sm { gap: 0.5rem; }
.gap-md { gap: 1rem; }
.gap-lg { gap: 1.5rem; }

/* --------------------------------------------------------------------------
   4. SECTION HEADERS & LABELS
   -------------------------------------------------------------------------- */
.section-header {
  margin-bottom: 3rem;
}

.section-header-center {
  text-align: center;
}

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

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  background: var(--accent-cyan-glow);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.section-tag-emerald {
  color: var(--accent-emerald);
  background: var(--accent-emerald-glow);
  border-color: rgba(16, 185, 129, 0.3);
}

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

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   5. ACCESSIBILITY OVERRIDES (Reduced Motion)
   -------------------------------------------------------------------------- */
@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;
  }
}