:root {
    --primary: #0066FF;
    --primary-dark: #0052CC;
    --primary-light: #E6F0FF;
    --bg: #FAFBFC;
    --surface: #FFFFFF;
    --border: #E1E4E8;
    --text: #24292F;
    --text-secondary: #57606A;
    --text-muted: #8B949E;
    --danger: #CF222E;
}

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

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text);
    line-height: 1.6;
}

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

.login-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 48px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

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

.login-logo-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #0066FF 0%, #00AAFF 100%);
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.login-logo-icon svg {
    width: 32px;
    height: 32px;
    fill: white;
}

.login-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 14px;
    color: var(--text-muted);
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: #FFEBE9;
    color: var(--danger);
    border: 1px solid var(--danger);
}

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

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.login-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.login-btn:hover {
    background: var(--primary-dark);
}

.login-footer {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

@media (max-width: 480px) {
    .login-card {
        padding: 32px 24px;
    }
}