/* Van Nguyen Portfolio Redesign - August 2025 */

/* 1. Root Variables & Global Styles ============================ */
:root {
    --primary-font: 'Poppins', sans-serif;
    --background-dark: #1a1a2e;
    --background-light: #16213e;
    --primary-accent: #0f3460;
    --secondary-accent: #e94560;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --card-bg: #1f2847;
    --border-color: rgba(255, 255, 255, 0.1);
}
/* Add this right after the :root { ... } block */
html {
    scroll-behavior: smooth;
    /* This new property below helps with the active link highlighting */
    scroll-padding-top: 100px; 
}
body {
    font-family: var(--primary-font);
    background-color: var(--background-dark);
    color: var(--text-primary);
}

main {
    flex: 1; /* Pushes footer down */
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-primary);
}

h1 {
    font-size: 2.8rem;
    font-weight: 700;
}

h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-accent);
    display: inline-block;
}

p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.1rem;
}

a {
    color: var(--secondary-accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: white;
}

.section-padding {
    padding: 80px 0;
}

.accent-text {
    color: var(--secondary-accent);
}

/* 2. Navigation & Footer ============================ */
.navbar {
    background-color: rgba(26, 26, 46, 0.85); /* Semi-transparent */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary) !important;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

.nav-link.active, .nav-link:hover {
    color: white !important;
}

.navbar-toggler {
    border-color: var(--border-color);
}
.navbar-toggler-icon {
    filter: invert(1);
}

footer.footer {
    background-color: var(--background-light);
    color: var(--text-secondary);
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
}
footer.footer .social-icon {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin: 0 1rem;
    transition: color 0.3s ease;
}
footer.footer .social-icon:hover {
    color: var(--secondary-accent);
}

/* 3. Hero Section (Homepage) ============================ */
.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-section .lead {
    font-size: 1.4rem;
    color: var(--text-secondary);
}

.btn-custom-primary {
    background-color: var(--secondary-accent);
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid var(--secondary-accent);
}

.btn-custom-primary:hover {
    background-color: transparent;
    color: var(--secondary-accent);
    transform: translateY(-3px);
}

.btn-custom-secondary {
    background-color: transparent;
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
}

.btn-custom-secondary:hover {
    background-color: var(--secondary-accent);
    border-color: var(--secondary-accent);
    transform: translateY(-3px);
}

/* 4. Skills Section (Homepage) ============================ */
.skills-section {
    background-color: var(--background-light);
}
.skill-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    height: 100%;
}
.skill-card h3 {
    font-size: 1.5rem;
    border-bottom: 2px solid var(--primary-accent);
    padding-bottom: 10px;
    margin-bottom: 15px;
}
.skill-card ul {
    list-style: none;
    padding: 0;
}
.skill-card ul li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}
.skill-card ul li i {
    color: var(--secondary-accent);
    margin-right: 10px;
}

/* 5. Projects Section ============================ */
.project-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
}

.project-card .card-body {
    padding: 1.8rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-card .card-title {
    font-size: 1.5rem;
    font-weight: 700;
}
.project-card .card-text {
    font-size: 1rem;
    color: var(--text-secondary);
    flex-grow: 1;
}

.tech-tags {
    padding: 0;
    margin: 1rem 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.tech-tags .tag {
    background-color: var(--primary-accent);
    color: var(--text-primary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-card .card-footer {
    background-color: transparent;
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.8rem;
}

.project-card .btn-project {
    margin-right: 10px;
    color: var(--text-primary);
    font-weight: 500;
}
.project-card .btn-project:hover {
    color: var(--secondary-accent);
}
.project-card .btn-project i {
    margin-right: 5px;
}


/* 6. Services & Contact Pages ============================ */
.service-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    height: 100%;
    text-align: center;
    transition: all 0.3s ease;
}
.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}
.service-card i {
    font-size: 3rem;
    color: var(--secondary-accent);
    margin-bottom: 1.5rem;
}

.form-control, .form-select {
    background-color: var(--background-light);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
}
.form-control:focus, .form-select:focus {
    background-color: var(--background-light);
    color: var(--text-primary);
    border-color: var(--secondary-accent);
    box-shadow: 0 0 0 0.25rem rgba(233, 69, 96, 0.25);
}
.form-label {
    color: var(--text-secondary);
}

/* 7. Navigation CTA Button ============================ */
.btn-nav-contact {
    background-color: var(--secondary-accent);
    color: white !important;
    padding: 8px 20px !important;
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
    margin-left: 1rem;
}

.btn-nav-contact:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(233, 69, 96, 0.2);
}

/* 8. Hero Section Adjustments for Large Screens ============================ */
.hero-image {
    border-radius: 25px; /* Creates the soft-cornered square */
    max-width: 400px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

/* Media Query for screens wider than 1400px */
@media (min-width: 1400px) {
    .hero-section h1 {
        font-size: 3.5rem; /* Makes heading bigger to balance image */
    }
    .hero-image {
        max-width: 500px; /* Makes image even larger on big screens */
    }
}
/* 10. Project Filter Menu Styling ============================ */
.filter-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    margin: 0 5px;
    padding: 8px 20px;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background-color: var(--primary-accent);
    color: white;
    border-color: var(--primary-accent);
}

.filter-btn.active {
    background-color: var(--secondary-accent);
    color: white;
    border-color: var(--secondary-accent);
}

/* 12 Education & Certifications Section ============================ */
.credential-card {
    background-color: var(--background-light);
    border-left: 4px solid var(--secondary-accent);
    padding: 1.5rem;
    border-radius: 5px;
}

.credential-title {
    font-weight: 700; /* This makes the titles bold */
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.credential-issuer {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 13 Certification Link Styling ============================ */
a.credential-link {
    text-decoration: none; /* Removes the default underline */
}

a.credential-link .credential-title {
    transition: color 0.3s ease;
}

a.credential-link:hover .credential-title {
    color: var(--secondary-accent); /* Changes color on hover */
}

.credential-title .fa-external-link-alt {
    opacity: 0.6;
    margin-left: 5px;
}

.project-card {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.project-card .card-body {
  flex: 1;
}