:root {
    --bg-color: #F8F9FA;
    --text-color: #111827;
    --card-bg: #FFFFFF;
    --primary: #0F172A; /* Deep Navy */
    --accent: #2563EB; /* Tech Blue */
    --border: #E5E7EB;
    --success: #10B981;
}

body.dark-mode {
    --bg-color: #0F172A;
    --text-color: #F8F9FA;
    --card-bg: #1E293B;
    --primary: #F8F9FA;
    --border: #334155;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', system-ui, -apple-system, sans-serif; background: var(--bg-color); color: var(--text-color); line-height: 1.6; }

/* Layout */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--border); }
section { padding: 60px 0; }

/* Navigation */
nav a { text-decoration: none; color: var(--text-color); margin-left: 20px; font-weight: 500; font-size: 0.9rem; }
.theme-btn { background: none; border: 1px solid var(--border); padding: 5px 10px; cursor: pointer; color: var(--text-color); border-radius: 4px; }
.hamburger { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-color); }

/* Mobile Menu */
#mobile-menu { display: none; flex-direction: column; position: absolute; top: 70px; left: 0; width: 100%; background: var(--card-bg); border-bottom: 1px solid var(--border); padding: 20px; z-index: 100; }
#mobile-menu a { margin: 10px 0; }

/* Hero */
.hero { text-align: center; padding: 80px 0 40px; }
.hero h1 { font-size: 3rem; letter-spacing: -0.05em; margin-bottom: 20px; }
.hero p { font-size: 1.2rem; color: #6B7280; max-width: 600px; margin: 0 auto 40px; }

/* Application Form Container */
.application-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 40px; max-width: 600px; margin: 0 auto; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1); }
.hidden { display: none; }

/* Form Elements */
.form-group { margin-bottom: 20px; text-align: left; }
label { display: block; margin-bottom: 8px; font-weight: 500; font-size: 0.9rem; }
input, select, textarea { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-color); color: var(--text-color); font-family: inherit; }
.btn-primary { width: 100%; background: var(--accent); color: white; padding: 14px; border: none; border-radius: 6px; font-weight: 600; cursor: pointer; transition: opacity 0.2s; }
.btn-primary:hover { opacity: 0.9; }
.btn-outline { width: 100%; background: transparent; border: 1px solid var(--border); color: var(--text-color); padding: 14px; margin-bottom: 10px; border-radius: 6px; cursor: pointer; }
.btn-outline:hover { background: var(--bg-color); border-color: var(--accent); }

/* Sticky CTA (Mobile) */
.sticky-cta { display: none; position: fixed; bottom: 0; left: 0; width: 100%; background: var(--card-bg); padding: 15px; border-top: 1px solid var(--border); text-align: center; z-index: 99; }
.sticky-cta a { display: block; background: var(--accent); color: white; padding: 12px; border-radius: 6px; text-decoration: none; font-weight: 600; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 40px 0; font-size: 0.85rem; color: #6B7280; text-align: center; }
footer a { color: #6B7280; text-decoration: none; margin: 0 10px; }
.footer-emails { margin-top: 10px; }

/* Responsiveness */
@media (max-width: 768px) {
    nav.desktop-nav { display: none; }
    .hamburger { display: block; }
    .sticky-cta { display: block; }
    .hero h1 { font-size: 2rem; }
    .application-card { padding: 20px; }
    body { padding-bottom: 70px; /* Space for sticky CTA */ }
}