/* style.css - Enhanced Modern Design */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

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

body {
    font-family: 'Vazirmatn', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    direction: rtl;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.form-card {
    background: var(--card-background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    width: 100%;
    max-width: 600px;
    position: relative;
    animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.form-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { transform: translateX(-100%) translateY(-100%); }
    50% { transform: translateX(0%) translateY(0%); }
}

.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.step {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
}

.step.active {
    background: white;
    color: var(--primary-color);
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.step-number {
    position: relative;
    z-index: 1;
}

.step-line {
    width: 60px;
    height: 2px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 1px;
    position: relative;
    overflow: hidden;
}

.step-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), transparent);
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { left: -100%; }
    100% { left: 100%; }
}

.form-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.form-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
    position: relative;
    z-index: 1;
}

form {
    padding: 2rem;
}

.form-section {
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.form-section:nth-child(1) { animation-delay: 0.1s; }
.form-section:nth-child(2) { animation-delay: 0.2s; }
.form-section:nth-child(3) { animation-delay: 0.3s; }

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

.form-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.form-section h3::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-radius: 2px;
}

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

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
    color: var(--text-primary);
    position: relative;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    transform: translateY(-1px);
}

.form-group input:focus + .error-message,
.form-group select:focus + .error-message {
    opacity: 0;
}

.form-group input.error,
.form-group select.error {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
    animation: shake 0.5s ease-in-out;
}

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

.error-message {
    color: var(--error-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: none;
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.form-group.error .error-message {
    display: block;
    opacity: 1;
}

.registration-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.option-card {
    position: relative;
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.option-card:hover {
    transform: translateY(-2px);
}

.option-card input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    z-index: 2;
}

.option-label {
    display: block;
    padding: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.option-label::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.option-label::after {
    content: '✓';
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    width: 20px;
    height: 20px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s ease;
}

.option-card input[type="checkbox"]:checked + .option-label {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.option-card input[type="checkbox"]:checked + .option-label::before {
    opacity: 1;
}

.option-card input[type="checkbox"]:checked + .option-label::after {
    opacity: 1;
    transform: scale(1);
}

.option-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.option-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.option-card input[type="checkbox"]:checked + .option-label .option-title {
    color: white;
}

.exam-mode-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.radio-option {
    position: relative;
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    z-index: 2;
}

.radio-label {
    display: block;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.radio-label::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--warning-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.radio-option input[type="radio"]:checked + .radio-label {
    border-color: var(--warning-color);
    background: var(--warning-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.radio-option input[type="radio"]:checked + .radio-label::before {
    width: 100%;
    height: 100%;
}

.radio-title {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: color 0.3s ease;
    position: relative;
    z-index: 1;
}

.radio-option input[type="radio"]:checked + .radio-label .radio-title {
    color: white;
}

.form-actions {
    margin-top: 2rem;
    text-align: center;
}

.submit-btn {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    min-width: 200px;
    position: relative;
    overflow: hidden;
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:hover::before {
    left: 100%;
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.submit-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-btn.loading {
    pointer-events: none;
}

.submit-btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.form-errors {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    border-radius: var(--radius-md);
    color: var(--error-color);
    font-weight: 500;
    display: none;
    animation: slideInDown 0.3s ease-out;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-errors.show {
    display: block;
}

.form-errors ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.form-errors li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-right: 1rem;
}

.form-errors li::before {
    content: '•';
    position: absolute;
    right: 0;
    color: var(--error-color);
}

.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .form-header {
        padding: 1.5rem;
    }
    
    .form-header h1 {
        font-size: 1.5rem;
    }
    
    form {
        padding: 1.5rem;
    }
    
    .registration-options,
    .exam-mode-options {
        grid-template-columns: 1fr;
    }
    
    .step-indicator {
        gap: 0.5rem;
    }
    
    .step-line {
        width: 40px;
    }
    
    .submit-btn {
        width: 100%;
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .form-header {
        padding: 1rem;
    }
    
    .form-header h1 {
        font-size: 1.25rem;
    }
    
    form {
        padding: 1rem;
    }
    
    .option-label,
    .radio-label {
        padding: 0.75rem;
    }
    
    .option-title,
    .radio-title {
        font-size: 0.8rem;
    }
}