:root {
    --primary-color: #0DBD8B;
    --primary-hover: #0BA978;
    --primary-active: #099966;
    --background: #FFFFFF;
    --background-secondary: #F3F8F9;
    --text-primary: #17191C;
    --text-secondary: #737D8C;
    --border-color: #E3E8F0;
    --error-color: #E64F4F;
    --success-color: #0DBD8B;
    --warning-color: #FFB020;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-primary);
    line-height: 1.5;
}

.container {
    width: 100%;
    max-width: 440px;
}

.registration-card {
    background: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px;
    animation: slideUp 0.3s ease-out;
}

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

.logo-section {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    font-weight: 400;
}

.registration-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: all 0.2s ease;
    outline: none;
}

.form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(13, 189, 139, 0.1);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

.form-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.input-with-suffix {
    display: flex;
    align-items: center;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.2s ease;
}

.input-with-suffix:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(13, 189, 139, 0.1);
}

.input-with-suffix .form-input {
    border: none;
    box-shadow: none;
    flex: 1;
}

.input-with-suffix:focus-within .form-input {
    box-shadow: none;
}

.input-suffix {
    padding: 12px 16px;
    font-size: 15px;
    color: var(--text-secondary);
    background: var(--background-secondary);
    border-left: 1px solid var(--border-color);
    white-space: nowrap;
}

.form-hint {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: -4px;
}

.password-strength {
    margin-top: 8px;
}

.strength-bar {
    height: 4px;
    background: var(--background-secondary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}

.strength-fill {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-fill.weak {
    width: 33%;
    background: var(--error-color);
}

.strength-fill.medium {
    width: 66%;
    background: var(--warning-color);
}

.strength-fill.strong {
    width: 100%;
    background: var(--success-color);
}

.strength-text {
    font-size: 12px;
    color: var(--text-secondary);
}

.submit-button {
    width: 100%;
    padding: 14px 24px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    color: white;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 8px;
    position: relative;
    min-height: 48px;
}

.submit-button:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.submit-button:active:not(:disabled) {
    background: var(--primary-active);
    transform: translateY(0);
}

.submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.button-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.error-message {
    padding: 12px 16px;
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--radius);
    color: var(--error-color);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.error-message::before {
    content: "⚠";
    font-size: 18px;
}

.success-message {
    padding: 12px 16px;
    background: #F0FDF4;
    border: 1px solid #BBF7D0;
    border-radius: var(--radius);
    color: var(--success-color);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.success-message::before {
    content: "✓";
    font-size: 18px;
}

.form-footer {
    text-align: center;
    margin-top: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

@media (max-width: 480px) {
    .registration-card {
        padding: 24px;
    }

    .title {
        font-size: 24px;
    }

    .subtitle {
        font-size: 14px;
    }
}