:root {
    --bg-color: #0d1117;
    --text-color: #e6edf3;
    --glass-bg: rgba(22, 27, 34, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --primary-color: #58a6ff;
    --primary-hover: #3182ce;
    --error-color: #ff7b72;
    --success-color: #3fb950;
    --input-bg: rgba(13, 17, 23, 0.8);
    --border-radius: 12px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top left, #1f2937, #0d1117);
}

.auth-container {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 400px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-weight: 600;
    font-size: 1.8rem;
    background: linear-gradient(90deg, #58a6ff, #a371f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: #8b949e;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background-color: var(--input-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    transition: all 0.3s ease;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

button.primary-btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    background: linear-gradient(to right, #238636, #2ea043);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.3s ease, transform 0.1s ease;
}

button.primary-btn:hover {
    opacity: 0.9;
}

button.primary-btn:active {
    transform: scale(0.98);
}

.auth-links {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.9rem;
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.auth-links a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

#auth-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
    min-height: 1.2em;
}

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