/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a3a;
    --bg-card: #252550;
    --text-primary: #ffffff;
    --text-secondary: #b0b0d0;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #10b981;
    --error: #ef4444;
    --border: #3a3a6a;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
}

/* Card */
.card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 20px 60px var(--shadow);
    border: 1px solid var(--border);
}

.title {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 32px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: 12px;
}

.tab-btn {
    flex: 1;
    padding: 12px 16px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.tab-btn.active {
    background: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Forms */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Buttons */
.btn {
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
    border-color: var(--accent);
}

/* Status Message */
.status-message {
    margin-top: 20px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    display: none;
}

.status-message.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-message.info {
    background: rgba(99, 102, 241, 0.2);
    color: var(--accent);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

/* User Info */
.user-info {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.user-greeting {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: 600;
}

.greeting-icon {
    font-size: 28px;
}

#logout-btn {
    width: 100%;
}

/* Responsive */
@media (max-width: 480px) {
    .card {
        padding: 24px;
    }
    
    .title {
        font-size: 24px;
        margin-bottom: 24px;
    }
    
    .tabs {
        margin-bottom: 20px;
    }
    
    .tab-btn {
        padding: 10px 12px;
        font-size: 14px;
    }
    
    .form-group input {
        padding: 10px 14px;
        font-size: 15px;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 15px;
    }
}

/* Loading state (optional enhancement) */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}