:root {
    --color-white: #ffffff;
    --color-black: #111111;
    --color-primary-red: #d32f2f;
    --color-secondary-blue: #1976d2;
    --color-bg-light: #f8f9fa;
    --color-border: #e0e0e0;
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body { 
    font-family: var(--font-primary); 
    color: var(--color-black); 
    background-color: var(--color-white); 
    line-height: 1.6; 
    display: flex; 
    flex-direction: column; 
    min-height: 100vh; 
    -webkit-font-smoothing: antialiased; 
}

h1, h2, h3, h4 { line-height: 1.2; margin-bottom: 1rem; }
p { margin-bottom: 1rem; }

a { color: var(--color-secondary-blue); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--color-primary-red); }

.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }
.main-content { flex: 1; padding: 4rem 0; }

.btn { 
    display: inline-block; 
    padding: 0.75rem 1.5rem; 
    border-radius: 4px; 
    font-weight: 600; 
    text-align: center; 
    border: none; 
    cursor: pointer; 
    transition: background-color 0.2s, color 0.2s, transform 0.1s; 
}
.btn-primary { background-color: var(--color-primary-red); color: var(--color-white); }
.btn-primary:hover { background-color: #b71c1c; color: var(--color-white); }
.btn-outline { background-color: transparent; border: 2px solid var(--color-secondary-blue); color: var(--color-secondary-blue); }
.btn-outline:hover { background-color: var(--color-secondary-blue); color: var(--color-white); }

/* Header & Navigation (Mobile First) */
.app-header { 
    background-color: var(--color-white); 
    border-bottom: 1px solid var(--color-border); 
    position: sticky; 
    top: 0; 
    z-index: 100; 
    box-shadow: 0 2px 10px rgba(0,0,0,0.05); 
}
.navbar { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo a { font-size: 1.5rem; color: var(--color-black); font-weight: bold; }
.logo span { color: var(--color-secondary-blue); }

.menu-toggle { 
    display: block; 
    background: none; 
    border: none; 
    font-size: 1.5rem; 
    cursor: pointer; 
    color: var(--color-black); 
}
.nav-menu { 
    position: absolute; 
    top: 70px; 
    left: 0; 
    width: 100%; 
    background-color: var(--color-white); 
    box-shadow: 0 4px 6px rgba(0,0,0,0.05); 
    display: none; 
}
.nav-menu.active { display: block; }

.nav-links { list-style: none; display: flex; flex-direction: column; }
.nav-links a { 
    color: var(--color-black); 
    font-weight: 500; 
    display: block; 
    padding: 1rem; 
    text-align: center; 
    border-bottom: 1px solid var(--color-border); 
}
.nav-links a:hover, .nav-links a.active { color: var(--color-primary-red); }

/* Hero Section */
.hero { 
    background-color: var(--color-bg-light); 
    padding: 5rem 0; 
    border-radius: 8px; 
    border-left: 5px solid var(--color-primary-red); 
    margin-bottom: 3rem; 
}
.hero h1 { font-size: 2.2rem; margin-bottom: 1rem; color: var(--color-primary-red); }
.hero-text { font-size: 1.2rem; max-width: 600px; color: #555; margin-bottom: 2rem; }
.hero-actions { display: flex; flex-direction: column; gap: 1rem; }

/* Grid Layout */
.grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.card { 
    background-color: var(--color-white); 
    border: 1px solid var(--color-border); 
    border-radius: 8px; 
    padding: 2rem; 
    transition: transform 0.2s, box-shadow 0.2s; 
    border-top: 4px solid var(--color-secondary-blue); 
}
.card:hover { 
    transform: translateY(-5px); 
    box-shadow: 0 10px 20px rgba(0,0,0,0.08); 
    border-top-color: var(--color-primary-red); 
}
.card h3 { color: var(--color-secondary-blue); margin-bottom: 1rem; display: flex; align-items: center; gap: 0.5rem; }

/* Footer */
.app-footer { 
    background-color: var(--color-black); 
    color: var(--color-white); 
    padding: 2rem 0; 
    text-align: center; 
    margin-top: auto; 
}
.app-footer p { margin: 0; opacity: 0.8; }

/* Desktop View (min-width: 768px) */
@media (min-width: 768px) {
    .menu-toggle { display: none; }
    .nav-menu { display: block; position: static; width: auto; box-shadow: none; background-color: transparent; }
    .nav-links { flex-direction: row; gap: 2rem; }
    .nav-links a { padding: 0; border-bottom: none; position: relative; }
    .nav-links a.active::after { 
        content: ''; 
        position: absolute; 
        bottom: -5px; 
        left: 0; 
        width: 100%; 
        height: 2px; 
        background-color: var(--color-primary-red); 
    }
    .hero h1 { font-size: 3rem; margin-bottom: 1.5rem; }
    .hero-actions { flex-direction: row; }
    .grid { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
}