/* --- Core Variables & Reset --- */
:root {
    --bg-primary: #111111;
    --bg-secondary: #1a1a1a;
    --text-primary: #e0e0e0;
    --text-secondary: #999999;
    --accent-primary: #0070f3;
    --accent-glow: rgba(0, 112, 243, 0.4);
    --border-color: #333333;
    --radius: 8px;
    --shadow: 0 4px 20px rgba(0,0,0,0.2);
    --transition-fast: all 0.2s ease-in-out;
    --transition-med: all 0.4s ease-in-out;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Accessibility --- */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    background: var(--accent-primary);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 9999;
    transition: top 0.3s;
    border-radius: var(--radius);
}
.skip-link:focus { top: 1rem; }
.aria-live-region { display: none; }

/* --- Header & Navigation --- */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(17, 17, 17, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
}
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}
.nav-link:hover, .nav-link[aria-current="page"] { color: var(--text-primary); }
.cta-button {
    background: var(--accent-primary);
    color: #fff;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius);
}
.cta-button:hover { filter: brightness(1.1); }
.nav-toggle { display: none; } /* Mobile Nav later */

/* --- Main Content & Pages --- */
main {
    padding-top: 65px; /* Height of header */
    opacity: 1;
    transition: opacity var(--transition-med);
}
main.fade-out { opacity: 0; }
.page-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 6rem 2rem;
    animation: fadeIn 0.5s ease-in-out forwards;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.section-title {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}
.section-subtitle {
    text-align: center;
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 4rem auto;
}

/* --- Page Specific: Home --- */
.hero {
    min-height: calc(80vh - 65px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.hero h1 {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    background: linear-gradient(90deg, #fff, #aaa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}
.hero .cta-button {
    margin-top: 2rem;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

/* --- Generic Grid for Cards --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition-med);
}
.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 0 25px var(--accent-glow);
}
.card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}
.card .icon { font-size: 2.5rem; margin-bottom: 1.5rem; }
.card .role { color: var(--accent-primary); font-weight: 500; margin-bottom: 1rem; }
.card p { color: var(--text-secondary); }

/* --- About Page --- */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* --- Contact Form --- */
.contact-form { max-width: 650px; margin: 2rem auto 0; }
.form-group { margin-bottom: 1.5rem; }
.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}
.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}
.submit-button {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    background: var(--accent-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition-fast);
}
.submit-button:hover { filter: brightness(1.15); }

/* --- Footer --- */
.site-footer-main {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}
.social-icons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}
.social-icon {
    font-size: 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}
.social-icon:hover {
    color: var(--text-primary);
    transform: translateY(-3px);
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
    .navbar { padding: 1rem; }
    .nav-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        width: 24px;
        height: 24px;
        background: transparent;
        border: none;
        cursor: pointer;
        z-index: 1001;
    }
    .icon-bar {
        width: 100%;
        height: 2px;
        background: var(--text-primary);
        transition: all 0.3s;
    }
    .nav-toggle.open .icon-bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .nav-toggle.open .icon-bar:nth-child(2) { opacity: 0; }
    .nav-toggle.open .icon-bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        width: 100%;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
    }
    .nav-links.open { transform: translateX(0); }
    .nav-link { font-size: 1.5rem; }
    .page-container { padding: 4rem 1rem; }
}