:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-gold: #f59e0b;
    --accent-purple: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #f59e0b 100%);
    --success: #10b981;
    --danger: #ef4444;
    --border: rgba(148, 163, 184, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

body {
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(245, 158, 11, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(245, 158, 11, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 2rem;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 480px) {
    .auth-container {
        padding: 1rem;
    }
    .auth-card {
        padding: 1.5rem;
        border-radius: 16px;
    }
    .brand-logo {
        font-size: 2rem;
    }
    .brand-name {
        font-size: 1.25rem;
    }
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--glass-shadow);
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent-gradient);
}

.brand {
    text-align: center;
    margin-bottom: 2rem;
}

.brand-logo {
    font-size: 2.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.auth-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    text-align: center;
}

.auth-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
}

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    transition: color 0.3s;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.3s;
    box-sizing: border-box;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-purple);
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.form-control:focus + .input-icon {
    color: var(--accent-purple);
}

.btn-primary {
    width: 100%;
    padding: 0.875rem;
    background: var(--accent-gradient);
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.auth-footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.auth-link {
    color: var(--accent-purple);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.auth-link:hover {
    color: var(--accent-gold);
}

.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}

/* Checkbox custom style */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
    user-select: none;
}

.checkbox-wrapper input {
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(15, 23, 42, 0.6);
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
}

.checkbox-wrapper input:checked {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
}

.checkbox-wrapper input:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
}

.options-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.toggle-password {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    cursor: pointer;
    z-index: 10;
}