:root {
    --primary: #00ff88;
    --primary-dark: #00cc66;
    --secondary: #00ccff;
    --danger: #ff4444;
    --warning: #ffbb33;
    --success: #00C851;
    --info: #33b5e5;
    --bg-dark: #0a0e1a;
    --bg-card: #151e2f;
    --bg-input: #1e2a3a;
    --text-primary: #ffffff;
    --text-secondary: #b0b7c9;
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --shadow: 0 8px 32px rgba(0,255,136,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: var(--bg-card);
    padding: 1rem 0;
    border-bottom: 2px solid var(--primary);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.theme-toggle {
    background: rgba(255,255,255,0.1);
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--primary);
    color: var(--bg-dark);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary);
    color: var(--bg-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,255,136,0.3);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--bg-dark);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,204,255,0.3);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--bg-dark);
}

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

.btn-danger:hover {
    background: #ff6666;
}

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

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid rgba(255,255,255,0.1);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

/* Forms */
.input-group {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.input-group input, 
.input-group textarea, 
.input-group select {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus, 
.input-group textarea:focus, 
.input-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Result boxes */
.result-box {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    border-left: 4px solid var(--primary);
    word-break: break-all;
    font-family: monospace;
}

/* Grid layouts */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* Tool header */
.tool-header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    color: var(--bg-dark);
}

.tool-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* Tabs */
.tab-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.tab {
    flex: 1;
    padding: 1rem;
    background: var(--bg-input);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    transition: var(--transition);
    min-width: 100px;
}

.tab:hover {
    background: rgba(0,255,136,0.1);
    color: var(--primary);
}

.tab.active {
    background: var(--primary);
    color: var(--bg-dark);
}

/* Footer */
.footer {
    background: var(--bg-card);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--primary);
    text-align: center;
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .tab-container {
        flex-direction: column;
    }
    
    .input-group {
        flex-direction: column;
    }
}