:root {
    --primary-color: #059669;
    --primary-hover: #047857;
    --success-color: #10b981;
    --success-hover: #059669;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-gradient: linear-gradient(135deg, #34d399 0%, #059669 50%, #047857 100%);
    --card-shadow: 0 20px 25px -5px rgba(5, 150, 105, 0.1), 0 10px 10px -5px rgba(5, 150, 105, 0.04);
    --border-radius: 16px;
}

* {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    margin: 0;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-wrapper {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.login-container {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #10b981, #059669, #047857);
}

.logo {
    max-width: 80px;
    height: auto;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 4px 8px rgba(5, 150, 105, 0.2));
}

.login-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.login-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.5;
}

.error-message {
    background: #fef2f2;
    border: 1px solid #fca5a5;
    color: #dc2626;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.google-login-btn {
    background: #ffffff;
    border: 2px solid #d1d5db;
    color: var(--text-primary);
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 12px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.google-login-btn:hover {
    background: #f0fdf4;
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(5, 150, 105, 0.15);
    text-decoration: none;
}

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

.google-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.security-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 0.75rem;
    background: #f0fdf4;
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--primary-color);
    border: 1px solid #bbf7d0;
}

.loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid #d1d5db;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Mobile optimizations */
@media (max-width: 576px) {
    body {
        padding: 0.5rem;
    }
    .login-container {
        padding: 1.5rem;
        margin: 0.5rem;
    }
    .login-title {
        font-size: 1.5rem;
    }
    .google-login-btn {
        padding: 1rem 1.25rem;
        font-size: 0.95rem;
    }
}

/* Tablet view */
@media (min-width: 768px) {
    .login-wrapper {
        max-width: 450px;
    }
    .login-container {
        padding: 2.5rem;
    }
    .logo {
        max-width: 100px;
    }
    .login-title {
        font-size: 2rem;
    }
}

/* Desktop view */
@media (min-width: 1024px) {
    body {
        padding: 2rem;
    }
    .login-wrapper {
        max-width: 500px;
    }
    .login-container {
        padding: 3rem;
    }
    .logo {
        max-width: 120px;
        margin-bottom: 2rem;
    }
    .login-title {
        font-size: 2.25rem;
        margin-bottom: 0.75rem;
    }
    .login-subtitle {
        font-size: 1rem;
        margin-bottom: 2.5rem;
    }
    .google-login-btn {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {

    .login-container {
        background: rgba(17, 24, 39, 0.95);
        border-color: rgba(5, 150, 105, 0.3);
    }
    .login-title {
        color: #f9fafb;
    }
    .login-subtitle {
        color: #d1d5db;
    }
    .google-login-btn {
        background: rgba(31, 41, 55, 0.8);
        border-color: #374151;
        color: #f9fafb;
    }
    .google-login-btn:hover {
        background: rgba(5, 150, 105, 0.1);
        border-color: var(--primary-color);
        color: #10b981;
    }
    .security-badge {
        background: rgba(5, 150, 105, 0.1);
        border-color: rgba(5, 150, 105, 0.3);
    }
}