/* ===========================
   GenPackAI Landing Page Styles
   =========================== */

/* --- Design Tokens --- */
:root {
  /* Colors — max 5 */
  --color-primary: #1a73e8;
  --color-background: #ffffff;
  --color-surface: #f8f9fa;
  --color-text: #202124;
  --color-text-secondary: #5f6368;

  /* Typography — max 2 font families */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Sizing */
  --font-size-body: 16px;
  --font-size-heading: 24px;
  --font-size-brand: 32px;

  /* Spacing */
  --card-gap: 24px;
  --card-padding: 32px;
  --card-radius: 12px;

  /* Transitions */
  --transition-hover: 200ms ease;
}

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

html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

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

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

/* --- Body Styles --- */
body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-size: var(--font-size-heading);
  line-height: 1.3;
}

h1 {
  font-size: var(--font-size-brand);
}

p {
  color: var(--color-text-secondary);
}

/* --- Header / Logo Section --- */
header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 24px 24px;
}

header img {
  min-width: 64px;
  min-height: 64px;
}

header h1 {
  font-size: var(--font-size-brand);
  font-weight: 700;
}

/* --- Tool Cards Container (nav) --- */
nav[aria-label="GenPackAI Tools"] {
  display: flex;
  flex-direction: row;
  justify-content: center;
  gap: var(--card-gap);
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Tool Card --- */
.tool-card {
  background: var(--color-surface);
  padding: var(--card-padding);
  border-radius: var(--card-radius);
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  transition: var(--transition-hover);
  transition-property: background-color, box-shadow, transform;
}

.tool-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.tool-card:focus {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--card-radius);
}

.tool-card:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--card-radius);
}

.tool-card:focus:not(:focus-visible) {
  outline: none;
}

.tool-card svg {
  width: 48px;
  height: 48px;
}

.tool-card h2 {
  font-size: var(--font-size-heading);
  font-weight: 600;
}

.tool-card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body);
}

/* --- Responsive: Stack cards on mobile --- */
@media (max-width: 768px) {
  nav[aria-label="GenPackAI Tools"] {
    flex-direction: column;
  }

  .tool-card {
    width: 100%;
  }
}