:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #34495e;
    --light-bg: #f8f9fa;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-color: #ffffff;
    --card-bg: #ffffff;
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: #2c3e50;
}

[data-theme="dark"] {
    --primary-color: #ecf0f1;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #ecf0f1;
    --light-bg: #2c3e50;
    --bg-color: #34495e;
    --card-bg: #2c3e50;
    --navbar-bg: rgba(52, 73, 94, 0.95);
    --footer-bg: #1a252f;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation */
.navbar {
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: var(--navbar-bg);
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--text-color) !important;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--secondary-color) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background: var(--secondary-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--secondary-color);
    border: 2px solid var(--secondary-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
    margin-left: 15px;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(52, 152, 219, 0.3);
}

.theme-toggle:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
}

.theme-toggle i {
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%, #f093fb 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><polygon fill="rgba(255,255,255,0.1)" points="0,1000 1000,0 1000,1000"/></svg>');
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease-out;
}

.hero .lead {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-buttons {
    animation: fadeInUp 1s ease-out 0.6s both;
    margin-bottom: 2rem;
}

.btn-primary-custom {
    background: var(--accent-color);
    border: none;
    padding: 12px 30px;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
    margin-right: 1rem;
}

.btn-primary-custom:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(231, 76, 60, 0.3);
}

.btn-outline-custom {
    border: 2px solid white;
    color: white;
    padding: 10px 30px;
    font-weight: 600;
    border-radius: 50px;
    background: transparent;
    transition: all 0.3s ease;
}

.btn-outline-custom:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Profile Image */
.profile-img {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 5px solid white;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    object-fit: cover;
    transition: transform 0.3s ease;
    animation: float 6s ease-in-out infinite;
    display: block;
    margin: 2rem auto 0;
    position: relative;
    z-index: 1;
}

.profile-img:hover {
    transform: scale(1.05);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--secondary-color);
    border-radius: 2px;
}

/* About Section */
.about-img {
    width: 100%;
    max-width: 400px;
    border-radius: 15px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
}

.about-img:hover {
    transform: translateY(-10px);
}

/* Skills */
.skill-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    height: 100%;
    border-top: 4px solid var(--secondary-color);
}

.skill-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.skill-item i {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Projects */
.project-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.project-img {
    height: 200px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

/* Contact Form */
.contact-form {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.form-control {
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 12px 15px;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* Footer */
.footer {
    background: var(--footer-bg);
    color: white;
    padding: 3rem 0 2rem;
}

.social-links a {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: var(--secondary-color);
    color: white;
    text-align: center;
    line-height: 50px;
    border-radius: 50%;
    margin: 0 10px;
    transition: all 0.3s ease;
    font-size: 1.2rem;
    text-decoration: none;
}

.social-links a:hover {
    background: var(--accent-color);
    transform: translateY(-5px);
    text-decoration: none;
    color: white;
}

/* Typing Animation */
.typing-text {
    border-right: 3px solid #fff;
    animation: blink 1s infinite;
    display: inline-block;
    min-height: 1.2em;
    min-width: 10px;
}

@keyframes blink {
    0%, 50% { border-color: #fff; }
    51%, 100% { border-color: transparent; }
}

/* Typing container for better control */
.typing-container {
    display: inline-block;
    position: relative;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .profile-img {
        width: 220px;
        height: 220px;
        margin: 1.5rem auto 0;
    }

    .section {
        padding: 50px 0;
    }

    .hero-buttons .btn {
        margin-bottom: 1rem;
    }

    .hero-buttons {
        margin-bottom: 1.5rem;
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
        margin-left: 10px;
    }

    .hero .row {
        text-align: center;
    }
}

/* Loading animation */
.loading {
    display: none;
}

/* Success message */
.alert-success {
    display: none;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}