/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    text-align: center;
    padding: 40px 20px;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    animation: float 20s infinite linear;
    pointer-events: none;
}

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-20px) rotate(360deg); }
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

/* Main Content */
main {
    padding: 40px;
}

/* Form Styles */
.contact-form {
    display: grid;
    gap: 25px;
}

.form-group {
    position: relative;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #34495e;
    font-size: 1.05em;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e6ed;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #fafbfc;
    font-family: inherit;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: white;
    transform: translateY(-2px);
}

/* Input Animation */
input:not(:placeholder-shown):valid {
    border-color: #2ecc71;
    background: #f8fffe;
}

input:not(:placeholder-shown):invalid {
    border-color: #e74c3c;
    background: #fef8f8;
}

/* Textarea Styles */
textarea {
    resize: vertical;
    min-height: 120px;
}

/* Select Dropdown */
select {
    cursor: pointer;
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%23666" d="M2 0L0 2h4zm0 5L0 3h4z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 12px;
}

/* Checkbox Styles */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 10px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
    padding-left: 35px;
    margin-bottom: 0;
    font-weight: 500;
    transition: color 0.3s ease;
}

.checkbox-label:hover {
    color: #667eea;
}

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    width: 0;
    height: 0;
}

.checkmark {
    position: absolute;
    left: 0;
    top: 0;
    height: 22px;
    width: 22px;
    background-color: #f1f3f4;
    border: 2px solid #e0e6ed;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked ~ .checkmark {
    background-color: #667eea;
    border-color: #667eea;
    transform: scale(1.1);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-label input[type="checkbox"]:checked ~ .checkmark:after {
    display: block;
}

.checkbox-label .checkmark:after {
    left: 6px;
    top: 2px;
    width: 6px;
    height: 12px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Radio Button Styles */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 10px;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
    padding-left: 35px;
    margin-bottom: 0;
    font-weight: 500;
    transition: color 0.3s ease;
}

.radio-label:hover {
    color: #667eea;
}

.radio-label input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    width: 0;
    height: 0;
}

.radio-mark {
    position: absolute;
    left: 0;
    top: 0;
    height: 22px;
    width: 22px;
    background-color: #f1f3f4;
    border: 2px solid #e0e6ed;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.radio-label input[type="radio"]:checked ~ .radio-mark {
    background-color: #667eea;
    border-color: #667eea;
    transform: scale(1.1);
}

.radio-mark:after {
    content: "";
    position: absolute;
    display: none;
}

.radio-label input[type="radio"]:checked ~ .radio-mark:after {
    display: block;
}

.radio-label .radio-mark:after {
    top: 4px;
    left: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: white;
}

/* Terms Checkbox */
.terms-checkbox {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.terms-checkbox:hover {
    border-color: #667eea;
    background: #f7f8ff;
}

/* Error Messages */
.error-message {
    display: block;
    color: #e74c3c;
    font-size: 0.9em;
    margin-top: 5px;
    font-weight: 500;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.error-message.show {
    opacity: 1;
    transform: translateY(0);
}

/* Success Message */
.success-message {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    color: white;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    margin-top: 20px;
    box-shadow: 0 10px 30px rgba(46, 204, 113, 0.3);
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.success-message h3 {
    margin-bottom: 10px;
    font-size: 1.5em;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.submit-btn,
.reset-btn {
    padding: 14px 30px;
    border: none;
    border-radius: 25px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.submit-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
}

.submit-btn:active {
    transform: translateY(-1px);
}

.reset-btn {
    background: linear-gradient(135deg, #95a5a6, #7f8c8d);
    color: white;
    box-shadow: 0 8px 20px rgba(149, 165, 166, 0.3);
}

.reset-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(149, 165, 166, 0.4);
}

/* Button Loading Animation */
.submit-btn.loading {
    pointer-events: none;
    position: relative;
}

.submit-btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Footer */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        border-radius: 10px;
    }
    
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    main {
        padding: 30px 20px;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 15px;
    }
    
    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .submit-btn,
    .reset-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8em;
    }
    
    .subtitle {
        font-size: 1em;
    }
    
    main {
        padding: 20px 15px;
    }
    
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="number"],
    select,
    textarea {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* Form Validation States */
.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: #e74c3c;
    background-color: #fdf2f2;
    animation: shake 0.5s ease-in-out;
}

.form-group.success input,
.form-group.success select,
.form-group.success textarea {
    border-color: #2ecc71;
    background-color: #f2fdf4;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus indicators for accessibility */
input:focus,
select:focus,
textarea:focus,
button:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .container {
        border: 2px solid #000;
    }
    
    input, select, textarea {
        border-width: 3px;
    }
}