/* --- Language Display Logic --- */
body.lang-en .pt { display: none !important; }
body.lang-pt .en { display: none !important; }

/* --- CSS Variables & Theming --- */
:root {
    --bg-color: #f8f9fa;
    --text-color: #333333;
    --heading-color: #1a252f;
    --nav-bg: rgba(255, 255, 255, 0.85);
    --card-bg: #ffffff;
    --accent-color: #0056b3;
    --accent-hover: #003d82;
    --whatsapp-color: #25D366;
    --whatsapp-hover: #128C7E;
    --hero-bg-1: #1a252f;
    --hero-bg-2: #2c3e50;
    --hero-text: #ffffff;
    --hero-subtext: #d1d8e0;
    --tag-bg: #e9ecef;
    --tag-text: #495057;
    --border-color: #eaeaea;
    --shadow-color: rgba(0, 0, 0, 0.05);
}

/* Dark Mode Overrides */
body.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --heading-color: #ffffff;
    --nav-bg: rgba(18, 18, 18, 0.85);
    --card-bg: #1e1e1e;
    --accent-color: #64b5f6;
    --accent-hover: #90caf9;
    --hero-bg-1: #0b1116;
    --hero-bg-2: #16202a;
    --tag-bg: #333333;
    --tag-text: #e0e0e0;
    --border-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.4);
}

/* --- Global Styles & Reset --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* --- Typography & Colors --- */
h1, h2, h3 {
    color: var(--heading-color);
    margin-bottom: 15px;
    transition: color 0.4s ease;
}

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

a:hover {
    color: var(--accent-hover);
}

/* --- Header & Navigation --- */
header {
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 10%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--heading-color);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
    align-items: center;
}

nav ul li a {
    color: var(--text-color);
    font-weight: 500;
}

nav ul li a:hover {
    color: var(--accent-color);
}

.nav-buttons {
    display: flex;
    gap: 15px;
}

.nav-btn {
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-color);
    cursor: pointer;
    transition: transform 0.3s ease, color 0.3s ease;
}

.nav-btn:hover {
    transform: scale(1.15);
    color: var(--accent-color);
}

/* --- Hero Section --- */
#hero {
    background: linear-gradient(135deg, var(--hero-bg-1), var(--hero-bg-2));
    padding: 80px 10%;
    color: var(--hero-text);
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 50px;
    max-width: 1100px;
    margin: 0 auto;
}

.hero-image-column {
    flex: 0 0 280px;
    display: flex;
    justify-content: center;
}

.hero-text-column {
    flex: 1;
    text-align: left;
}

#hero h1 {
    color: var(--hero-text);
    font-size: 2.8rem;
    margin-bottom: 20px;
}

#hero p strong {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 25px;
    color: var(--accent-color);
}

.about-text {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 30px auto;
    color: var(--hero-subtext);
    text-align: justify;
}

.profile-pic {
    width: 280px;
    height: 373px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    background-color: var(--accent-color);
    color: #ffffff !important;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: var(--accent-hover);
}

.contact-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.whatsapp-btn {
    background-color: var(--whatsapp-color);
}

.whatsapp-btn:hover {
    background-color: var(--whatsapp-hover);
}

/* Container for Hero Buttons */
.hero-buttons {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

/* Secondary Outline Button Style */
.outline-btn {
    background-color: transparent !important;
    border: 2px solid #ffffff;
    color: #ffffff !important;
}

.outline-btn:hover {
    background-color: #ffffff !important;
    color: var(--hero-bg-1) !important;
}

/* --- CV Dropdown --- */
.dropdown {
    position: relative;
    display: inline-block;
    outline: none;
}

.dropdown-content {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    background-color: var(--card-bg);
    min-width: 220px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    border-radius: 8px;
    z-index: 1000;
    top: 130%;
    left: 50%;
    transform: translateX(-50%);
    transition: all 0.3s ease;
}

.dropdown:hover .dropdown-content,
.dropdown:focus-within .dropdown-content {
    visibility: visible;
    opacity: 1;
    top: 110%;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 15px 20px;
    text-decoration: none;
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.dropdown-content a:last-child {
    border-bottom: none;
}

.dropdown-content a:hover {
    background-color: var(--tag-bg);
    color: var(--accent-color);
}

/* --- Section Formatting --- */
section {
    padding: 80px 10%;
    max-width: 1200px;
    margin: 0 auto;
}

section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
}

/* --- Project & Experience Cards --- */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.project-card, .experience-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease, background-color 0.4s ease;
}

.project-card {
    border-top: 4px solid var(--accent-color);
}

.experience-card {
    border-left: 5px solid var(--accent-color);
    margin-bottom: 30px;
}

.project-card:hover, .experience-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 86, 179, 0.15);
    border-color: var(--accent-hover);
}

.experience-card h3 {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.experience-card h4 {
    color: var(--accent-color);
    margin-bottom: 15px;
    font-weight: 600;
    font-size: 1.1rem;
}

.experience-card ul {
    margin-left: 20px;
}

.experience-card li {
    margin-bottom: 10px;
    line-height: 1.6;
}

.project-card h3 {
    font-size: 1.3rem;
}

.project-card p {
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.tech-tag {
    display: inline-block;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 8px;
    margin-bottom: 8px;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* --- Certification Cards --- */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.cert-card {
    background-color: var(--card-bg);
    padding: 30px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    text-align: center;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease, background-color 0.4s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-color);
    border-top: 4px solid var(--accent-color);
}

a.cert-link:hover {
    color: var(--text-color);
}

.cert-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 86, 179, 0.15);
    border-color: var(--accent-hover);
}

.cert-logo {
    height: 55px;
    width: auto;
    max-width: 100%;
    margin-bottom: 20px;
    object-fit: contain;
    border-radius: 4px;
}

.cert-card h3 {
    font-size: 1.15rem;
    margin-bottom: 5px;
    color: var(--heading-color);
}

.cert-card h4 {
    color: var(--accent-color);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.view-cert {
    margin-top: auto;
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--accent-color);
    transition: color 0.3s ease;
}

.cert-card:hover .view-cert {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* --- Scroll Reveal Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* --- Contact & Footer --- */
#contact {
    text-align: center;
    background-color: var(--card-bg);
    margin-bottom: 0;
    border-top: 1px solid var(--border-color);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

#contact p {
    margin-bottom: 30px;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: var(--hero-bg-1);
    color: var(--hero-subtext);
    font-size: 0.9rem;
}

/* --- Mobile Responsiveness (MUST REMAIN AT BOTTOM) --- */
@media (max-width: 768px) {
    header nav {
        flex-direction: column;
        padding: 15px 5%;
        gap: 15px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    .nav-buttons {
        width: 100%;
        justify-content: center;
        margin-top: 5px;
    }

    .hero-container {
        flex-direction: column;
        gap: 30px;
    }
    
    .hero-text-column {
        text-align: center;
    }

    #hero h1 {
        font-size: 2.2rem;
    }
    
    section {
        padding: 50px 5%;
    }
    
    section h2 {
        font-size: 1.8rem;
        margin-bottom: 35px;
    }
    
    .hero-image-column {
        flex: 0 0 auto;
    }
    
    .profile-pic {
        width: 220px;
        height: 293px;
    }

    .contact-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-buttons .btn {
        width: 100%;
        max-width: 250px;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
}