/* --- 1. Variables & Global Styles --- */
:root {
    --bg-dark: #0a0a0a;
    --bg-card: #171717;
    --primary: #3b82f6; /* Electric Blue */
    --secondary: #8b5cf6; /* Violet */
    --accent: #06b6d4; /* Cyan */
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --gradient-main: linear-gradient(135deg, var(--primary), var(--secondary));
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow-x: hidden;
    position: relative;
}

h1, h2, h3, .logo { font-family: 'Space Grotesk', sans-serif; }
a { text-decoration: none; color: inherit; transition: 0.3s ease; }

/* --- 2. Animated Background --- */
.background-glow {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%),
                radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08), transparent 25%);
    z-index: -1;
    pointer-events: none;
}

/* --- 3. Header --- */
header {
    padding: 1.5rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { 
    font-size: 1.5rem; 
    font-weight: 700; 
    background: var(--gradient-main); 
    -webkit-background-clip: text; 
    background-clip: text;
    -webkit-text-fill-color: transparent; 
}

nav ul { display: flex; gap: 2rem; }
nav a { font-weight: 500; font-size: 0.9rem; color: var(--text-muted); position: relative; }
nav a:hover { color: var(--text-main); }
nav a::after {
    content: ''; position: absolute; width: 0; height: 2px; bottom: -4px; left: 0;
    background: var(--gradient-main); transition: width 0.3s;
}
nav a:hover::after { width: 100%; }

.menu-btn { display: none; font-size: 1.5rem; cursor: pointer; color: var(--text-main); }

/* --- 4. Hero Section --- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 10%;
    text-align: center;
    flex-direction: column;
    position: relative;
}

.hero-badge {
    margin-top: 25px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
    display: inline-block;
}

.hero-title {
    font-size: 4.5rem;
    line-height: 1.3;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, #9ca3af);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;   
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin-bottom: 3rem;
}

.cta-group { display: flex; gap: 1rem; justify-content: center; }

.btn-primary {
    background: var(--gradient-main);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4); }

.btn-outline {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-main);
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
}
.btn-outline:hover { border-color: var(--primary); background: rgba(59, 130, 246, 0.05); }

/* --- 5. Tech Stack & Skills --- */
section { 
    padding: 6rem 10%; 
    scroll-margin-top: 80px; /* Προσθήκη: Αφήνει κενό από πάνω όταν γίνεται scroll */
}
.section-header { margin-bottom: 4rem; text-align: center; }
.section-header h2 { font-size: 2.5rem; margin-bottom: 1rem; }
.section-header span { color: var(--primary); }

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.tech-category {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: 0.3s;
}
.tech-category:hover { border-color: var(--primary); transform: translateY(-5px); }
.tech-category h3 { margin-bottom: 1.5rem; color: var(--text-main); display: flex; align-items: center; gap: 0.8rem; }

.skill-list { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.skill-pill {
    background: rgba(255,255,255,0.03);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
    border: 1px solid rgba(255,255,255,0.05);
    display: flex; align-items: center; gap: 0.5rem;
}
.skill-pill i { color: var(--accent); }

/* --- 6. Projects (Featured) --- */
.project-card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    transition: 0.3s;
}
.project-card:hover { border-color: var(--secondary); box-shadow: 0 10px 40px -10px rgba(0,0,0,0.5); }

.p-content { padding: 3rem; display: flex; flex-direction: column; justify-content: center; }
.p-overline { color: var(--accent); font-family: 'Space Grotesk', sans-serif; margin-bottom: 0.5rem; font-size: 0.9rem; letter-spacing: 1px; }
.p-title { font-size: 2rem; margin-bottom: 1rem; color: var(--text-main); }
.p-desc { color: var(--text-muted); margin-bottom: 1.5rem; line-height: 1.7; }

.p-tech { display: flex; gap: 1rem; margin-bottom: 2rem; flex-wrap: wrap; }
.p-tech span { font-family: 'Space Grotesk', monospace; font-size: 0.85rem; color: var(--text-main); }

.p-links { display: flex; gap: 1.5rem; }
.p-links a { font-size: 1.4rem; color: var(--text-muted); }
.p-links a:hover { color: var(--primary); }

.p-visual {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: rgba(255,255,255,0.05);
    position: relative;
    overflow: hidden;
}
.p-visual i { transform: scale(1.2); transition: 0.5s; }
.project-card:hover .p-visual i { transform: scale(1.1) rotate(-5deg); color: rgba(59, 130, 246, 0.2); }

/* --- 7. Timeline Compact --- */
.timeline-box {
    border-left: 2px solid rgba(255,255,255,0.1);
    padding-left: 2rem;
    margin-left: 1rem;
}
.t-item { position: relative; margin-bottom: 3rem; }
.t-item::before {
    content: ''; position: absolute; left: -2.6rem; top: 5px;
    width: 1rem; height: 1rem; background: var(--bg-dark);
    border: 2px solid var(--primary); border-radius: 50%;
}
.t-year { color: var(--accent); font-family: 'Space Grotesk', monospace; margin-bottom: 0.5rem; display: block; }
.t-role { font-size: 1.3rem; color: var(--text-main); margin-bottom: 0.5rem; }
.t-place { color: var(--text-muted); }

/* --- Footer --- */
footer { padding: 4rem 10%; text-align: center; border-top: 1px solid rgba(255,255,255,0.05); }

/* --- CSS-Only Scroll Animation --- */

@keyframes autoShow {
    from {
        opacity: 0;
        transform: translateY(100px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card, 
.tech-category, 
.t-item, 
.section-header {
    animation: autoShow linear both;
    animation-timeline: view();
    animation-range: entry 5% cover 30%;
}

/* --- Mobile Responsive & Menu Styling --- */
@media (max-width: 900px) {
    .hero-title { 
        font-size: 3rem;
        line-height: 1.3; 
    }
    .project-card { grid-template-columns: 1fr; }
    .p-visual { height: 200px; }
    
    /* Εμφάνιση του κουμπιού μενού */
    .menu-btn { 
        display: block; 
        z-index: 1001; 
        position: absolute; 
        right: 5%;          
        top: 50%;           
        transform: translateY(-50%);
    }

    /* Στυλ για το Mobile Menu */
    nav ul {
        position: fixed; /* Κλειδώνει στην οθόνη */
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh; /* Πιάνει όλο το ύψος */
        background: rgba(10, 10, 10, 0.96); /* Σχεδόν μαύρο */
        backdrop-filter: blur(20px); /* Εφέ θολώματος από πίσω */
        flex-direction: column; /* Κάθετη διάταξη */
        justify-content: center; /* Κεντράρισμα στον άξονα Υ */
        align-items: center; /* Κεντράρισμα στον άξονα Χ */
        gap: 3rem; /* Μεγάλο κενό μεταξύ των links */
        
        /* Animation Εισόδου */
        transform: translateY(-100%); /* Κρυμμένο πάνω */
        transition: transform 0.5s cubic-bezier(0.77, 0, 0.175, 1); /* Smooth κίνηση */
        z-index: 1000;
        
        /* Αφαίρεση κουκκίδων */
        list-style: none;
        padding: 0;
        margin: 0;
    }

    /* Όταν ανοίγει το μενού */
    nav ul.active {
        transform: translateY(0); /* Κατεβαίνει κάτω */
    }

    /* Στυλ των Links στο κινητό */
    nav a {
        font-family: 'Space Grotesk', sans-serif; /* Η μοντέρνα γραμματοσειρά */
        font-size: 2.5rem; /* Πολύ μεγάλα γράμματα */
        font-weight: 700;
        color: var(--text-muted);
        text-decoration: none;
        transition: 0.3s;
        position: relative;
    }

    /* Εφέ όταν ακουμπάς το δάχτυλο */
    nav a:hover {
        color: var(--text-main);
        letter-spacing: 2px; /* Ανοίγουν τα γράμματα */
    }

    /* Ειδικά για το "Hire Me" να ξεχωρίζει */
    nav a[href^="mailto"] {
        color: var(--primary);
        border: 1px solid rgba(59, 130, 246, 0.3);
        padding: 0.5rem 2rem;
        border-radius: 50px;
    }
}