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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --error: #ef4444;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.1) 0, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.1) 0, transparent 50%);
}

.container {
    width: 100%;
    max-width: 440px;
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 48px 40px;
    box-shadow: 
        0 20px 25px -5px rgba(0, 0, 0, 0.3),
        0 10px 10px -5px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
}

.logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

h1 {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 32px;
}

.error-message,
.success-message {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: #fca5a5;
}

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

.hidden {
    display: none !important;
}

.google-btn {
    width: 100%;
    padding: 14px 24px;
    background: white;
    color: #1f2937;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: all 0.2s;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.google-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.google-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.divider {
    margin: 32px 0;
    text-align: center;
    position: relative;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border);
}

.divider span {
    position: relative;
    background: var(--card-bg);
    padding: 0 16px;
    font-size: 12px;
    color: var(--text-muted);
}

.security-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-muted);
}

.feature svg {
    flex-shrink: 0;
}

.footer-text {
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 1000;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

@media (max-width: 480px) {
    .login-card {
        padding: 40px 24px;
    }
    
    h1 {
        font-size: 24px;
    }
}