:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --border-focus: #3b82f6;
    --error-color: #ef4444;
    --success-color: #22c55e;
    --radius: 12px;
    --transition: all 0.2s ease-in-out;
}

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

body {
    background-color: var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
}

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

.auth__card {
    background: var(--card-bg);
    width: 100%;
    max-width: 420px;
    padding: 40px 30px;
    border-radius: var(--radius);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

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

.auth__form-group {
    position: relative;
    margin-bottom: 20px;
}

.auth__input {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    color: var(--text-main);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    outline: none;
    transition: var(--transition);
}

.auth__input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.auth__input:-webkit-autofill {
    -webkit-box-shadow: 0 0 0 100px var(--card-bg) inset !important;
    -webkit-text-fill-color: var(--text-main) !important;
}

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

.auth__button:hover {
    background-color: var(--primary-hover);
}

.auth__button:disabled {
    background-color: var(--text-muted);
    opacity: 0.5;
    cursor: not-allowed;
}

.auth__footer {
    margin-top: 24px;
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
}

.auth__link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

.auth__message {
    margin-top: 20px;
    font-size: 14px;
    text-align: center;
    min-height: 20px;
    font-weight: 500;
}

.auth__message--error { color: var(--error-color); }
.auth__message--success { color: var(--success-color); }
.auth__message--info { color: var(--text-muted); }

@media (max-width: 480px) {
    .auth { padding: 12px; }
    
    .auth__card {
        padding: 30px 20px;
        box-shadow: none;
        border-radius: 0;
        background: transparent;
    }
}