:root {
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-color: #333;
    --text-secondary: #666;
    --border-radius: 12px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
}

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

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

.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(10px);
    width: 100%;
    max-width: 450px;
    transition: var(--transition);
}

.auth-card:hover {
    transform: translateY(-5px);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.icon-large {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.auth-header h1 {
    font-size: 24px;
    margin-bottom: 5px;
    color: #2c3e50;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.auth-tabs {
    display: flex;
    margin-bottom: 30px;
    background: #f9f9f9;
    border-radius: 8px;
    padding: 5px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 6px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.tab-btn:hover:not(.active) {
    background: rgba(74, 144, 226, 0.1);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #444;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper i {
    position: absolute;
    left: 15px;
    color: #999;
    z-index: 1;
}

.input-wrapper input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
}

.input-wrapper input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
    outline: none;
}

.toggle-password {
    position: absolute;
    right: 15px;
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
    z-index: 2;
}

.toggle-password:hover {
    color: var(--primary-color);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-label input {
    margin-right: 8px;
}

.forgot-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
}

.forgot-link:hover {
    text-decoration: underline;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: center;
}

.submit-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.submit-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-loading {
    display: none;
}

.submit-btn.loading .btn-text {
    display: none;
}

.submit-btn.loading .btn-loading {
    display: inline-block;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.auth-footer p {
    color: var(--text-secondary);
    font-size: 14px;
}

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

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

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-error {
    background: #fee;
    color: #c33;
    border: 1px solid #fcc;
}

.alert-success {
    background: #efe;
    color: #3c3;
    border: 1px solid #cfc;
}

.alert-warning {
    background: #ffe;
    color: #c93;
    border: 1px solid #ffc;
}

.alert-info {
    background: #eef;
    color: #33c;
    border: 1px solid #ccf;
}

.radio-group {
    display: flex;
    gap: 20px;
    background: #f9f9f9;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #ddd;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
}

.radio-label input {
    opacity: 0;
    position: absolute;
}

.radio-custom {
    width: 18px;
    height: 18px;
    border: 2px solid #999;
    border-radius: 50%;
    margin-right: 8px;
    position: relative;
    transition: var(--transition);
}

.radio-label input:checked + .radio-custom {
    border-color: var(--primary-color);
}

.radio-label input:checked + .radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
}

.radio-text {
    font-size: 14px;
    color: #444;
}

.file-upload-wrapper {
    position: relative;
    width: 100%;
}

.file-upload-wrapper input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.file-upload-box {
    border: 2px dashed #ddd;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    background: #f9f9f9;
}

.file-upload-wrapper input[type="file"]:hover + .file-upload-box {
    border-color: var(--primary-color);
    background: #f0f7ff;
}

.file-upload-box i {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.file-upload-box p {
    font-size: 13px;
    color: var(--text-secondary);
}

.file-upload-box span {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: #888;
    word-break: break-all;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}