/* RESET AND BASE */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* UTILITIES */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.focus-visible:focus { outline: 2px solid #2563eb; outline-offset: 2px; }

/* BUTTONS */
.btn { padding: 12px 24px; border-radius: 8px; text-decoration: none; font-weight: 600; transition: all 0.3s ease; display: inline-block; border: 2px solid transparent; cursor: pointer; font-size: 1rem; line-height: 1.5; }
.btn:focus { outline: 2px solid #2563eb; outline-offset: 2px; }
.btn-secondary { background-color: transparent; color: white; border-color: white; }
.btn-secondary:hover { background-color: white; color: #2563eb; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255, 255, 255, 0.3); }
.btn i { margin-right: 8px; }

/* HEADINGS / SECTIONS */
section { padding: 80px 0; }
.section-title { font-size: 2.5rem; font-weight: 700; text-align: center; margin-bottom: 3rem; color: #1f2937; position: relative; }
.section-title::after { content: ''; position: absolute; width: 60px; height: 4px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); bottom: -10px; left: 50%; transform: translateX(-50%); border-radius: 2px; }

/* ABOUT (kept for legacy classes used across sections) */
.about { background-color: #f8fafc; }

/* SHARED TAGS */
.tech-tag { background: #e0e7ff; color: #3730a3; padding: 3px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 500; }