:root {
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --primary-color: #00ff88;
    --secondary-color: #0066ff;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    padding-top: 80px;
    padding-bottom: 40px;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(45deg, #1a1a1a, #2c3e50);
    font-family: 'Arial', sans-serif;
    color: white;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(0, 255, 136, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 102, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}

.calculator {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 20px;
    width: 320px;
    box-sizing: border-box;
}

.display {
    margin-bottom: 20px;
    width: 100%;
}

#result {
    width: 100%;
    height: 60px;
    font-size: 24px;
    text-align: right;
    padding: 10px;
    border: none;
    background: rgba(0, 0, 0, 0.2);
    color: var(--primary-color);
    font-family: monospace;
    border-radius: 8px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
    box-sizing: border-box;
    margin-bottom: 10px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    width: 100%;
}

button {
    width: 100%;
    padding: 15px 5px;
    font-size: 16px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

button:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.operator {
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-color);
}

.equals {
    background: var(--primary-color);
    color: #1a1a1a;
}

.clear, .delete {
    background: rgba(255, 59, 59, 0.1);
    color: #ff3b3b;
}

h1 {
    color: #333;
    font-family: Arial, sans-serif;
}

.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    background: var(--glass-bg);
    color: var(--primary-color);
}

.donate-btn {
    background: var(--primary-color);
    color: #1a1a1a !important;
}

main {
    padding-top: 100px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.title {
    font-size: 2.5rem;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
    margin: 0;
}

.glass-footer {
    position: relative;
    bottom: 0;
    width: 100%;
    text-align: center;
    padding: 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    margin-top: 3rem;
}

.glass-footer p {
    margin: 0.5rem 0;
}

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* About page styles */
.about-section {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.about-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* Updated Contact form styles */
.contact-form {
    width: 90%;
    max-width: 600px;
    margin: 2rem auto;
    padding: 2.5rem max(5%, 1.5rem);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.form-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding: 0 1rem;
}

.form-header h2 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.form-header p {
    color: rgba(255, 255, 255, 0.7);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-group textarea {
    min-height: 120px;
    max-height: 300px;
    resize: vertical;
    line-height: 1.5;
}

/* Tools dialog styles */
.tools-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(20px);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    z-index: 1100;
    text-align: center;
    min-width: 300px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 1050;
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* Responsive styles */
@media (max-width: 768px) {
    .nav-links {
        gap: 0.5rem;
        padding: 0;
        margin: 0;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-links a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    .contact-form {
        margin: 1rem auto;
        padding: 1.5rem;
        width: 95%;
    }

    .form-header h2 {
        font-size: 1.5rem;
    }

    .form-header p {
        font-size: 0.9rem;
    }

    .form-group label {
        font-size: 0.9rem;
    }

    .form-group input,
    .form-group textarea {
        padding: 0.875rem 1rem;
        font-size: 0.95rem;
    }

    .submit-btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .nav-content {
        flex-direction: column;
        gap: 1rem;
        padding: 0.5rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .contact-form {
        padding: 1.25rem;
    }

    .form-group {
        margin-bottom: 1.25rem;
    }

    .submit-btn {
        padding: 0.75rem 1.25rem;
    }

    .submit-btn svg {
        width: 20px;
        height: 20px;
    }
}

/* Focus and hover states */
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.15);
    background: rgba(0, 0, 0, 0.3);
}

.submit-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.3);
}

/* Form validation styles */
.form-group input:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
    border-color: #ff3b3b;
}

.form-group input:valid:not(:placeholder-shown),
.form-group textarea:valid:not(:placeholder-shown) {
    border-color: var(--primary-color);
}