:root {
    --md-dark-background: #121212;
    --md-dark-surface: #1E1E1E;
    --md-dark-on-surface: #E0E0E0;
    --md-dark-primary: #A8C7FA;
    --md-dark-on-primary: #1F334B;
    --md-dark-outline: #8E9099;
    --md-dark-error: #F2B8B5;
    --md-dark-on-error: #601410;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--md-dark-background);
    color: var(--md-dark-on-surface);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 16px;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 400px;
    background-color: var(--md-dark-surface);
    border-radius: 16px;
    padding: 24px;
    box-sizing: border-box;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

h1 {
    font-size: 24px;
    font-weight: 500;
    margin: 0 0 24px 0;
    text-align: center;
}

.form-field {
    position: relative;
    margin-bottom: 24px;
}

.form-field input {
    width: 100%;
    padding: 16px 12px;
    background-color: transparent;
    border: 1px solid var(--md-dark-outline);
    border-radius: 8px;
    color: var(--md-dark-on-surface);
    font-size: 16px;
    outline: none;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
}

.form-field label {
    position: absolute;
    top: 16px;
    left: 12px;
    font-size: 16px;
    color: var(--md-dark-outline);
    pointer-events: none;
    transition: all 0.2s ease;
    background-color: var(--md-dark-surface);
    padding: 0 4px;
}

.form-field input:focus {
    border-color: var(--md-dark-primary);
}

.form-field input:focus + label,
.form-field input:not(:placeholder-shown) + label {
    top: -8px;
    left: 8px;
    font-size: 12px;
    color: var(--md-dark-primary);
}

.form-field input:not(:placeholder-shown) + label {
    color: var(--md-dark-outline);
}

.form-field input:focus:not(:placeholder-shown) + label {
    color: var(--md-dark-primary);
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background-color: var(--md-dark-primary);
    color: var(--md-dark-on-primary);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.error-message {
    color: var(--md-dark-error);
    font-size: 12px;
    min-height: 16px;
    margin-top: -16px;
    margin-bottom: 8px;
    text-align: center;
}

.loader {
    border: 4px solid var(--md-dark-outline);
    border-top: 4px solid var(--md-dark-primary);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

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

.hidden {
    display: none;
}

#success-view {
    text-align: center;
}

#success-view h1 {
    margin-bottom: 16px;
}

.open-app-btn {
    display: inline-block;
    text-decoration: none;
    width: 100%;
    padding: 14px;
    background-color: var(--md-dark-primary);
    color: var(--md-dark-on-primary);
    border: none;
    border-radius: 99px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s ease;
    box-sizing: border-box;
}