:root {
  --color-primary: #8a3ffc;
  --color-primary-dark: #6d34cc;
  --color-primary-light: #b58aff;
  --color-background: #12131b;
  --color-surface: #1f202a;
  --color-text-heading: #e0d9ff;
  --color-text-body: #b0a7d4;
  --color-link: #8a3ffc;
  --color-link-hover: #6d34cc;
  --color-card-bg: #1f202a;
  --color-card-shadow: rgba(138, 63, 252, 0.15);
  --color-btn-bg: #8a3ffc;
  --color-btn-bg-hover: #6d34cc;
  --color-btn-text: #f5f3ff;
  --border-radius: 0.75rem;
  --transition-speed: 0.3s;
  --max-container-width: 1200px;
  --spacing-base: 1rem;
  --font-family-heading: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-family-body: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}
body,
h1, h2, p, a, button {
  margin: 0;
  padding: 0;
  font-weight: normal;
}

body {
  font-family: var(--font-family-body);
  font-size: 16px;
  color: var(--color-text-body);
  line-height: 1.6;
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: calc(var(--spacing-base) * 4) var(--spacing-base);
}

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

/* Header */
header {
  text-align: center;
  margin-bottom: calc(var(--spacing-base) * 5);
  max-width: 700px;
  width: 100%;
}

header h1 {
  font-family: var(--font-family-heading);
  font-weight: 700;
  font-size: 3rem;
  color: var(--color-text-heading);
  margin-bottom: var(--spacing-base);
  line-height: 1.1;
}

header p {
  font-size: 1.125rem;
  color: var(--color-text-body);
  font-weight: 500;
  opacity: 0.8;
}

/* Projects Section */
.projects {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing-base) * 3);
  width: 100%;
  max-width: var(--max-container-width);
  margin-bottom: calc(var(--spacing-base) * 6);
  padding: 0 var(--spacing-base);
}

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

/* Project cards */
.project-card {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px var(--color-card-shadow);
  padding: calc(var(--spacing-base) * 2);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-speed), transform var(--transition-speed);
}

.project-card:hover,
.project-card:focus-within {
  box-shadow: 0 8px 20px rgba(138, 63, 252, 0.35);
  transform: translateY(-6px);
}

.project-info h2 {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-base);
  font-weight: 700;
}

.project-info p {
  flex-grow: 1;
  color: var(--color-text-body);
  font-weight: 500;
  margin-bottom: calc(var(--spacing-base) * 2);
  user-select: text;
}

/* Links inside project cards */
.project-info a {
  align-self: flex-start;
  text-decoration: none;
  color: var(--color-link);
  font-weight: 600;
  transition: color var(--transition-speed);
  font-size: 1rem;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  outline-offset: 2px;
}

.project-info a:hover,
.project-info a:focus-visible {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
  outline: none;
}

/* Back to Home Button container */
.back-home-container {
  width: 100%;
  max-width: var(--max-container-width);
  padding: 0 var(--spacing-base);
  margin-bottom: calc(var(--spacing-base) * 4);
  display: flex;
  justify-content: center;
}

/* Back to Home Button */
.back-home-btn {
  background-color: var(--color-btn-bg);
  color: var(--color-btn-text);
  border: none;
  border-radius: var(--border-radius);
  padding: calc(var(--spacing-base) * 1.25) calc(var(--spacing-base) * 3);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
  box-shadow: 0 4px 12px rgba(138, 63, 252, 0.3);
}

.back-home-btn:hover,
.back-home-btn:focus-visible {
  background-color: var(--color-btn-bg-hover);
  outline: none;
  transform: scale(1.05);
}

/* Accessible focus outlines for keyboard users */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-primary-light, #b58aff);
  outline-offset: 3px;
}