/* =========================================
   VARIABLES & RESET
   ========================================= */
:root {
    /* Light Mode Variables */
    --bg-primary: #ffffff;
    --bg-secondary: #f4f7f6;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --font-main: 'Inter', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #818cf8;
    --accent-glow: rgba(129, 140, 248, 0.4);
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

.section { padding: 100px 0; }
.bg-alternate { background-color: var(--bg-secondary); }

.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.underline {
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 0 auto;
    border-radius: 2px;
}

.fade-in-up { opacity: 0; transform: translateY(30px); transition: 0.6s ease-out; }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }

/* =========================================
   NAVIGATION
   ========================================= */
.navbar {
    position: fixed; top: 0; width: 100%;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container { display: flex; justify-content: space-between; align-items: center; height: 70px; }

.logo {
    font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; color: #fff;
}
.logo-accent { color: var(--accent-color); }

.nav-menu { display: flex; gap: 30px; align-items: center; }
.nav-link { color: #e2e8f0; font-weight: 500; }
.nav-link:hover, .nav-link.active { color: var(--accent-color); }

.theme-toggle {
    background: none; border: none; color: #fff; font-size: 1.2rem; cursor: pointer; padding: 5px;
}

.hamburger { display: none; cursor: pointer; }
.bar { display: block; width: 25px; height: 3px; margin: 5px auto; background-color: white; transition: 0.3s; }

/* =========================================
   HERO SECTION
   ========================================= */
.hero {
    min-height: 100vh;
    display: flex; align-items: center;
    position: relative; padding-top: 70px;
    background: radial-gradient(circle at top right, var(--accent-glow), transparent 40%);
}

.hero-content {
    display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center;
}

.hero-greeting { color: var(--accent-color); font-weight: 600; letter-spacing: 1px; margin-bottom: 10px; }
.hero-name { font-family: var(--font-display); font-size: 3.5rem; line-height: 1.1; margin-bottom: 20px; }
.hero-headline { font-size: 1.5rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.3; }
.hero-summary { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 30px; max-width: 600px; }

.hero-cta { display: flex; gap: 15px; flex-wrap: wrap; margin-bottom: 30px; }

.btn {
    display: inline-block; padding: 12px 28px; border-radius: 5px;
    font-weight: 600; transition: 0.3s ease; cursor: pointer;
}
.btn-primary {
    background-color: var(--accent-color); color: #fff;
    box-shadow: 0 4px 15px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--accent-glow); }
.btn-secondary {
    background-color: transparent; border: 2px solid var(--accent-color); color: var(--text-primary);
}
.btn-secondary:hover { background-color: rgba(59, 130, 246, 0.1); }
.btn-outline { border: 1px solid var(--text-secondary); color: var(--text-primary); }

/* Stats Row */
.stats-row { display: flex; gap: 40px; }
.stat-item h3 { font-size: 2.5rem; color: var(--accent-color); font-family: var(--font-display); margin-bottom: 5px; }
.stat-item p { color: var(--text-secondary); font-size: 0.9rem; }

/* Hero Image */
.hero-visual { position: relative; text-align: center; }
.profile-img-with-glow {
    width: 400px; height: 400px; object-fit: cover; border-radius: 20px;
    box-shadow: var(--shadow-hover); position: relative; z-index: 2;
    border: 2px solid var(--border-color);
}

.floating-tech {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 500px; height: 500px; z-index: 1; pointer-events: none;
}
.floating-tech i {
    position: absolute; color: var(--accent-color);
    font-size: 2rem; opacity: 0.3;
}
.floating-tech i:nth-child(1) { top: 10%; left: 10%; animation: float 6s infinite; }
.floating-tech i:nth-child(2) { top: 20%; right: 10%; animation: float 6s infinite 1s; }
.floating-tech i:nth-child(3) { bottom: 20%; left: 20%; animation: float 6s infinite 2s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* =========================================
   ABOUT SECTION
   ========================================= */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 50px; align-items: start; }
.about-text p { margin-bottom: 20px; color: var(--text-secondary); }
.stats-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px;
}
.stat-box {
    background: var(--bg-card); padding: 15px; border-radius: 8px;
    border: 1px solid var(--border-color); text-align: center;
}
.stat-box h4 { font-size: 1.5rem; color: var(--accent-color); font-family: var(--font-display); margin-bottom: 5px; }
.stat-box p { font-size: 0.8rem; color: var(--text-secondary); }

.highlight-card {
    background: var(--bg-card); padding: 20px; margin-bottom: 20px;
    border-radius: 12px; border: 1px solid var(--border-color);
    display: flex; gap: 15px; align-items: flex-start;
}
.highlight-card i { color: var(--accent-color); font-size: 1.5rem; margin-top: 3px; }
.highlight-card h4 { margin-bottom: 5px; font-size: 1.1rem; }
.highlight-card p { font-size: 0.9rem; color: var(--text-secondary); }

/* =========================================
   SKILLS SECTION
   ========================================= */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.skill-card {
    background-color: var(--bg-card); padding: 30px; border-radius: 15px;
    box-shadow: var(--shadow); text-align: center; border: 1px solid var(--border-color);
    transition: 0.3s ease;
}
.skill-card:hover { transform: translateY(-10px); border-color: var(--accent-color); }
.skill-icon { font-size: 2.5rem; color: var(--accent-color); margin-bottom: 20px; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 15px; }
.skill-tags span {
    background-color: var(--bg-secondary); padding: 5px 12px; border-radius: 20px;
    font-size: 0.85rem; color: var(--text-secondary); border: 1px solid var(--border-color);
}

/* =========================================
   TIMELINE (Experience)
   ========================================= */
.timeline { max-width: 800px; margin: 0 auto; position: relative; }
.timeline::before {
    content: ''; position: absolute; left: 0; top: 0; height: 100%;
    width: 2px; background-color: var(--border-color);
}
.timeline-item { position: relative; padding-left: 40px; margin-bottom: 50px; }
.timeline-dot {
    position: absolute; left: -6px; top: 5px; width: 14px; height: 14px;
    border-radius: 50%; background-color: var(--accent-color);
    border: 3px solid var(--bg-primary);
}
.timeline-date { color: var(--accent-color); font-weight: 600; margin-bottom: 5px; display: block; }
.timeline-content h3 { font-size: 1.25rem; margin-bottom: 5px; }
.timeline-content p { color: var(--text-secondary); margin-bottom: 10px; }
.timeline-content ul { list-style: disc; margin-left: 20px; color: var(--text-secondary); }

/* =========================================
   PROJECTS
   ========================================= */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; }
.project-card {
    background-color: var(--bg-card); border-radius: 15px; overflow: hidden;
    box-shadow: var(--shadow); border: 1px solid var(--border-color); transition: 0.3s ease;
    display: flex; flex-direction: column;
}
.project-card:hover { transform: translateY(-10px); border-color: var(--accent-color); }

.project-img-wrapper img { width: 100%; height: 200px; object-fit: cover; }
.project-content { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.project-content h3 { margin-bottom: 10px; font-size: 1.2rem; font-family: var(--font-display); }
.project-content p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 15px; flex: 1; }

.project-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 15px; }
.project-stack span {
    font-size: 0.75rem; background-color: var(--bg-secondary); padding: 4px 8px;
    border-radius: 4px; color: var(--accent-color); border: 1px solid var(--border-color);
}

.project-stats {
    font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 15px; display: flex; gap: 15px;
}
.project-stats i { color: var(--accent-color); margin-right: 5px; }

.project-links { display: flex; gap: 15px; margin-top: auto; }
.btn-link {
    font-weight: 600; color: var(--text-primary); display: flex; align-items: center; gap: 5px;
}
.btn-link:hover { color: var(--accent-color); }

/* =========================================
   CONTACT & FOOTER
   ========================================= */
.contact-container {
    display: grid; grid-template-columns: 1fr 1fr; gap: 50px;
    background-color: var(--bg-card); padding: 50px; border-radius: 20px;
    box-shadow: var(--shadow); border: 1px solid var(--border-color);
}

.info-item { display: flex; align-items: center; gap: 15px; margin-bottom: 20px; font-size: 1.1rem; }
.info-item i { color: var(--accent-color); }
.contact-social-large { margin-top: 30px; display: flex; gap: 20px; }
.contact-social-large a {
    width: 40px; height: 40px; background: var(--bg-secondary); display: flex;
    align-items: center; justify-content: center; border-radius: 50%; color: var(--text-primary);
}
.contact-social-large a:hover { background: var(--accent-color); color: #fff; }

.form-group { margin-bottom: 20px; }
.form-control {
    width: 100%; padding: 12px; background-color: var(--bg-primary);
    border: 1px solid var(--border-color); border-radius: 8px;
    color: var(--text-primary); font-family: var(--font-main);
}
.form-control:focus { outline: none; border-color: var(--accent-color); }

.toast {
    position: fixed; bottom: 30px; right: 30px; background-color: var(--bg-card);
    border-left: 4px solid var(--accent-color); padding: 15px 25px; border-radius: 8px;
    box-shadow: var(--shadow-hover); transform: translateY(150%); transition: 0.3s ease;
    z-index: 2000; display: flex; align-items: center; gap: 10px;
}
.toast.show { transform: translateY(0); }

.footer {
    background-color: var(--bg-secondary); padding: 40px 0;
    text-align: center; border-top: 1px solid var(--border-color);
}
.footer-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.social-links a {
    font-size: 1.2rem; margin-left: 20px; color: var(--text-secondary);
}
.social-links a:hover { color: var(--accent-color); }

/* Responsive */
@media (max-width: 900px) {
    .hero-content, .about-grid, .contact-container { grid-template-columns: 1fr; }
    .hero-visual { order: -1; margin-bottom: 30px; }
    .stats-row { justify-content: space-between; }
    .hamburger { display: block; z-index: 1001; }
    .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); }
    .nav-menu {
        position: fixed; left: -100%; top: 0; flex-direction: column;
        background-color: var(--bg-primary); width: 100%; height: 100vh;
        justify-content: center; transition: 0.3s;
    }
    .nav-menu.active { left: 0; }
    .nav-link { color: var(--text-primary); font-size: 1.5rem; }
}