:root {
    --bg-color: #0f0f11;
    --card-bg: rgba(25, 25, 28, 0.7);
    --primary-color: #d4af37; /* Gold tone often used in premium aesthetics */
    --primary-hover: #b5952f;
    --text-main: #f5f5f5;
    --text-muted: #a0a0a0;
    --error-color: #ff4c4c;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    background: radial-gradient(circle at top right, #2a2a30, #0f0f11);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(20px);
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-placeholder {
    text-align: center;
    margin-bottom: 40px;
}

.logo-placeholder h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.logo-placeholder p {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    font-size: 13px;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 15px;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.1);
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: #000;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.1s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 48px;
}

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

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

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.error-message {
    color: var(--error-color);
    font-size: 14px;
    text-align: center;
    margin-top: 20px;
    transition: opacity 0.3s ease;
}

.hidden {
    display: none !important;
}

/* Loader */
.loader {
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-left-color: #000;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

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