/* ============================================
   Design System - rodrigoamf.com
   Modern, Apple/Anthropic-inspired portfolio
   ============================================ */

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

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

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

/* --- Design Tokens --- */
:root {
  /* Colors - Light Theme */
  --color-bg-primary: #FAFAFA;
  --color-bg-secondary: #FFFFFF;
  --color-bg-tertiary: #F5F5F7;
  --color-text-primary: #1D1D1F;
  --color-text-secondary: #6E6E73;
  --color-text-tertiary: #86868B;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;
  --color-accent-subtle: #DBEAFE;
  --color-border: #E5E5EA;
  --color-border-subtle: #F0F0F2;
  --color-timeline-line: #D1D1D6;
  --color-timeline-dot: #2563EB;
  --color-card-shadow: rgba(0, 0, 0, 0.04);
  --color-card-hover-shadow: rgba(0, 0, 0, 0.08);
  --color-nav-bg: rgba(250, 250, 250, 0.72);
  --color-overlay: rgba(250, 250, 250, 0.95);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace,
               "Cascadia Code", "Source Code Pro", Menlo, monospace;

  /* Type Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-hero: clamp(2.5rem, 5vw, 4.5rem);

  /* Font Weights */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Line Heights */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --section-padding: clamp(4rem, 8vw, 8rem);
  --container-max: 1120px;
  --container-padding: clamp(1.5rem, 5vw, 3rem);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Dark Theme --- */
[data-theme="dark"] {
  --color-bg-primary: #0A0A0A;
  --color-bg-secondary: #141414;
  --color-bg-tertiary: #1C1C1E;
  --color-text-primary: #F5F5F7;
  --color-text-secondary: #A1A1A6;
  --color-text-tertiary: #6E6E73;
  --color-accent: #60A5FA;
  --color-accent-hover: #93C5FD;
  --color-accent-subtle: #1E3A5F;
  --color-border: #2C2C2E;
  --color-border-subtle: #1C1C1E;
  --color-timeline-line: #3A3A3C;
  --color-timeline-dot: #60A5FA;
  --color-card-shadow: rgba(0, 0, 0, 0.2);
  --color-card-hover-shadow: rgba(0, 0, 0, 0.4);
  --color-nav-bg: rgba(10, 10, 10, 0.72);
  --color-overlay: rgba(10, 10, 10, 0.95);
}

/* --- Base Styles --- */
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

.section__label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  text-align: center;
  margin-bottom: var(--space-3);
}

.section__title {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  text-align: center;
  margin-bottom: var(--space-16);
}

/* --- Utility Classes --- */
.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;
}