/* CSS Variables & Reset */
:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary-color: #3b82f6;
    --primary-gradient: linear-gradient(135deg, #3b82f6, #06b6d4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3 { font-weight: 800; }
a { text-decoration: none; color: inherit; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    background: transparent;
    transition: background 0.3s ease, padding 0.3s ease;
    z-index: 1000;
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo span {
    color: var(--primary-color);
}

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

.nav-links a:hover { color: var(--primary-color); transition: 0.3s; }

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    border: 2px solid var(--text-muted);
    color: var(--text-main);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    padding-top: 80px;
    background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.15), transparent 40%);
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-content h1 span {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px auto;
}

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

/* Services Section */
.services { padding: 100px 0; }
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-card);
    padding: 40px 30px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: rgba(59, 130, 246, 0.3);
}

.service-card .icon { font-size: 3rem; margin-bottom: 20px; }
.service-card h3 { margin-bottom: 15px; font-size: 1.5rem; }
.service-card p { color: var(--text-muted); }

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.5rem; }
    .nav-links { display: none; /* Add JS hamburger menu later */ }
    .hero-buttons { flex-direction: column; }
}

/* --- Portfolio Section --- */
.portfolio { padding: 100px 0; background-color: var(--bg-dark); }

.portfolio-grid {
    display: grid;
    /* Αλλάξαμε την παρακάτω γραμμή για να έχει ακριβώς 2 στήλες ίσου μεγέθους */
    grid-template-columns: repeat(2, 1fr); 
    gap: 40px;
}

.portfolio-card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.portfolio-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
    border-color: rgba(59, 130, 246, 0.3);
}

.img-placeholder img {
    width: 100%;
    height: 240px;
    object-fit: contain;
    display: block;
    transition: transform 0.5s ease;
}

.portfolio-card:hover .img-placeholder img {
    transform: scale(1.05);
}

.portfolio-content {
    padding: 25px;
}

.portfolio-content h3 { font-size: 1.4rem; margin-bottom: 10px; }
.portfolio-content p { color: var(--text-muted); margin-bottom: 20px; font-size: 0.95rem; }

.btn-small { padding: 8px 20px; font-size: 0.9rem; }

/* --- Mobile Menu (Hamburger) --- */
.hamburger {
    display: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--text-main);
    transition: all 0.3s ease-in-out;
    border-radius: 3px;
}

/* --- Responsive Design (Mobile & Tablets) --- */
@media (max-width: 768px) {
    /* Ενεργοποίηση Hamburger */
    .hamburger { display: block; }

    /* Απόκρυψη & Στυλιζάρισμα του Menu για κινητά */
	.nav-links {
        display: flex; /* <--- Αυτή η γραμμή λύνει το πρόβλημα */
        position: fixed;
        left: -100%;
        top: 0;
        gap: 0;
        flex-direction: column;
        background-color: rgba(15, 23, 42, 0.98);
        backdrop-filter: blur(15px);
        width: 100%;
        height: 100vh;
        text-align: center;
        transition: left 0.4s ease;
        justify-content: center;
        z-index: 999; /* <--- Εξασφαλίζει ότι το μενού είναι πάνω από το υπόλοιπο περιεχόμενο */
    }

    .nav-links.active { left: 0; }
    .nav-links li { margin: 25px 0; }
    .nav-links a { font-size: 1.5rem; }

    /* Προσαρμογή Hero Section για κινητά */
    .hero-content h1 { font-size: 2.8rem; }
    .hero-content p { font-size: 1rem; padding: 0 15px; }
    .hero-buttons { flex-direction: column; width: 100%; padding: 0 20px; }
    .btn-primary, .btn-secondary { width: 100%; text-align: center; margin-bottom: 15px; }

    /* Προσαρμογή Grid Services & Portfolio */
    .section-title { font-size: 2rem; }
    .services-grid, .portfolio-grid { grid-template-columns: 1fr; }
}

/* Animation για το Hamburger Menu όταν είναι ανοιχτό */
.hamburger.active .bar:nth-child(2) { opacity: 0; }
.hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* --- Contact Section --- */
.contact { padding: 100px 0; }

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    background: var(--bg-card);
    padding: 50px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: 40px;
}

.info-list {
    list-style: none;
}

.info-list li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    gap: 15px;
}

.info-list .icon {
    font-size: 1.5rem;
    background: rgba(59, 130, 246, 0.1);
    padding: 12px;
    border-radius: 12px;
}

.info-list .details strong {
    display: block;
    color: var(--text-main);
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.info-list .details span, 
.info-list .details a {
    color: var(--text-muted);
    transition: color 0.3s;
}

.info-list .details a:hover {
    color: var(--primary-color);
}

/* --- Contact Form & Floating Labels --- */
.contact-form-container {
    background: rgba(15, 23, 42, 0.5);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.02);
}

.input-group {
    position: relative;
    margin-bottom: 30px;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 16px;
    background: var(--bg-dark);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input-group textarea {
    resize: vertical;
}

/* Αλλαγή χρώματος όταν ο χρήστης γράφει (focus) */
.input-group input:focus,
.input-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Αρχική θέση του Label */
.input-group label {
    position: absolute;
    left: 16px;
    top: 16px;
    color: var(--text-muted);
    pointer-events: none;
    transition: all 0.3s ease;
}

/* Floating effect: Όταν το πεδίο είναι focus Ή δεν είναι άδειο (placeholder-shown) */
.input-group input:focus ~ label,
.input-group input:not(:placeholder-shown) ~ label,
.input-group textarea:focus ~ label,
.input-group textarea:not(:placeholder-shown) ~ label {
    top: -10px;
    left: 12px;
    font-size: 0.85rem;
    color: var(--primary-color);
    background: var(--bg-dark); /* Ίδιο background με το input για να κρύβει τη γραμμή */
    padding: 0 8px;
    border-radius: 4px;
}

.w-100 {
    width: 100%;
    text-align: center;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

/* --- Responsive Contact Section (στο τέλος του αρχείου, μέσα στο @media) --- */
@media (max-width: 768px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 30px 20px;
        gap: 40px;
    }
    
    .contact-form-container {
        padding: 30px 20px;
    }
}