:root {
    --md-primary: #6750A4;
    --md-primary-hover: #574195;
    --md-on-primary: #FFFFFF;
    --md-surface: #FFFFFF;
    --md-background: #F6F5FA;
    --md-on-surface: #1C1B1F;
    --md-on-surface-variant: #49454F;
    --md-outline: #79747E;
    --md-error: #B3261E;
    --md-error-container: #F9DEDC;
    --md-info-container: #E8DEF8;
    --md-elevation-1: 0 1px 2px rgba(0, 0, 0, 0.05), 0 2px 6px rgba(0, 0, 0, 0.08);
    --md-elevation-2: 0 1px 3px rgba(0, 0, 0, 0.15), 0 4px 10px rgba(0, 0, 0, 0.12);
}

*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--md-on-surface);
    background: var(--md-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--md-surface);
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: var(--md-elevation-1);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--md-primary);
    color: var(--md-on-primary);
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 1px;
}

.title {
    font-size: 24px;
    font-weight: 500;
    margin: 0 0 4px;
    letter-spacing: 0;
}

.subtitle {
    font-size: 14px;
    color: var(--md-on-surface-variant);
    margin: 0;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 16px;
}

.alert-error {
    background: var(--md-error-container);
    color: var(--md-error);
}

.alert-info {
    background: var(--md-info-container);
    color: var(--md-primary);
}

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

.field {
    position: relative;
}

.field input {
    width: 100%;
    padding: 20px 14px 8px;
    font-size: 16px;
    font-family: inherit;
    background: var(--md-surface);
    border: 1px solid var(--md-outline);
    border-radius: 4px;
    color: var(--md-on-surface);
    outline: none;
    transition: border-color 0.15s ease, border-width 0.15s ease;
}

.field input:hover {
    border-color: var(--md-on-surface);
}

.field input:focus {
    border: 2px solid var(--md-primary);
    padding: 19px 13px 7px;
}

.field label {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    color: var(--md-on-surface-variant);
    pointer-events: none;
    transition: top 0.15s ease, font-size 0.15s ease, color 0.15s ease;
    background: var(--md-surface);
    padding: 0 4px;
}

.field input:focus + label,
.field input:not(:placeholder-shown) + label {
    top: 0;
    font-size: 12px;
    color: var(--md-primary);
}

.btn-primary {
    background: var(--md-primary);
    color: var(--md-on-primary);
    border: none;
    padding: 14px 24px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.1px;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s ease, box-shadow 0.15s ease;
    margin-top: 8px;
}

.btn-primary:hover {
    background: var(--md-primary-hover);
    box-shadow: var(--md-elevation-2);
}

.btn-primary:active {
    background: var(--md-primary-hover);
    box-shadow: var(--md-elevation-1);
}

.btn-primary:focus-visible {
    outline: 3px solid var(--md-primary);
    outline-offset: 2px;
}