/* =========================================
   1. GLOBAL RESET & ENGINEERING THEME
   ========================================= */
:root {
    --navy: #0a192f;
    --light-navy: #112240;
    --lightest-navy: #233554;
    --slate: #8892b0;
    --light-slate: #a8b2d1;
    --white: #e6f1ff;
    --green: #64ffda; /* The "System Active" Neon */
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--navy);
    color: var(--slate);
    font-family: 'Calibre', 'Inter', 'San Francisco', 'SF Pro Text', -apple-system, system-ui, sans-serif;
    font-size: 18px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* =========================================
   2. TYPOGRAPHY
   ========================================= */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 20px 0;
    font-weight: 600;
    color: var(--white);
    line-height: 1.1;
}

h1 { font-size: 40px; }
h2 { font-size: 32px; }
h3 { font-size: 26px; }

a {
    display: inline-block;
    text-decoration: none;
    text-decoration-skip-ink: auto;
    color: var(--green);
    transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
}

a:hover {
    text-decoration: underline;
}

.subtitle {
    color: var(--green);
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 14px;
    font-weight: 400;
    margin-bottom: 20px;
    display: block;
}

.mono {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
}

.text-center { text-align: center; }
.text-left { text-align: left; }

/* =========================================
   3. NAVIGATION BAR (BASE STYLES)
   Note: Layout logic is handled in HTML <style> block for stricter control
   ========================================= */
.nav-logo-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--green);
}

.logo {
    color: var(--green);
    font-weight: 700;
    font-size: 24px;
    letter-spacing: 1px;
    text-decoration: none !important;
}

.nav-links a {
    color: var(--light-slate);
    font-size: 14px;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    padding: 10px;
    text-decoration: none !important;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--green);
}

/* =========================================
   4. LAYOUT CONTAINERS
   ========================================= */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 80px 20px;
}

.box-highlight {
    border: 1px solid var(--green);
    background-color: rgba(100, 255, 218, 0.05);
    padding: 25px;
    border-radius: 4px;
    margin: 30px 0;
    color: var(--white);
    font-size: 16px;
}

/* =========================================
   5. BUTTONS
   ========================================= */
.btn {
    color: var(--green);
    background-color: transparent;
    border: 1px solid var(--green);
    border-radius: 4px;
    padding: 18px 25px;
    font-size: 14px;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    line-height: 1;
    text-decoration: none !important;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
    margin-top: 30px;
}

.btn:hover {
    background-color: rgba(100, 255, 218, 0.1);
}

/* =========================================
   6. GRID SYSTEMS (CARDS & CERTIFICATES)
   ========================================= */
.protocol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.protocol-card, .cert-card {
    background-color: var(--light-navy);
    border-radius: 4px;
    overflow: hidden;
    transition: transform 0.2s;
    box-shadow: 0 10px 30px -15px rgba(2,12,27,0.7);
    cursor: pointer;
}

.protocol-card:hover, .cert-card:hover {
    transform: translateY(-5px);
}

.protocol-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    opacity: 0.8;
    transition: opacity 0.2s;
    border-bottom: 1px solid var(--lightest-navy);
}

.protocol-card:hover .protocol-img {
    opacity: 1;
}

.card-content {
    padding: 25px;
}

/* =========================================
   7. TESTIMONIALS
   ========================================= */
.test-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 40px;
    text-align: left;
}

.test-card {
    background-color: var(--light-navy);
    padding: 30px;
    border-radius: 4px;
    font-size: 15px;
}

.test-quote {
    display: block;
    margin-bottom: 15px;
    font-style: italic;
    color: var(--light-slate);
}

.test-author {
    color: var(--green);
    font-family: monospace;
    font-size: 12px;
}

/* =========================================
   8. FORMS (CONTACT PAGE)
   ========================================= */
.form-input, .form-textarea {
    width: 100%;
    background-color: var(--light-navy);
    border: 1px solid var(--lightest-navy);
    border-radius: 4px;
    color: var(--white);
    padding: 12px;
    font-size: 16px;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--green);
}

/* =========================================
   9. MODAL (POP-UPS)
   ========================================= */
.modal {
    display: none; 
    position: fixed; 
    z-index: 9999; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(10, 25, 47, 0.95); /* Heavy dark overlay */
    backdrop-filter: blur(5px);
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 85vh;
    border: 1px solid var(--green);
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
}

#modalCaption {
    margin: 15px auto;
    width: 80%;
    text-align: center;
    color: var(--green);
    font-family: monospace;
    font-size: 18px;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 35px;
    color: var(--white);
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.2s;
}

.close-btn:hover {
    color: var(--green);
}

/* =========================================
   10. FOOTER
   ========================================= */
footer {
    text-align: center;
    padding: 40px 20px;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 12px;
    color: var(--slate);
    background-color: var(--navy);
    border-top: 1px solid var(--lightest-navy);
}

footer a {
    color: var(--slate);
}

footer a:hover {
    color: var(--green);
}

/* =========================================
   11. MOBILE RESPONSIVENESS
   ========================================= */
@media (max-width: 768px) {
    .container {
        padding: 50px 20px;
    }
    
    h1 { font-size: 32px; }
    h2 { font-size: 26px; }
    
    .protocol-grid, .test-grid {
        grid-template-columns: 1fr; /* Stack cards vertically on phone */
    }
}