:root {
    --primary-color: #1e5f3f;
    --primary-dark: #144028;
    --primary-light: #2d8a5a;
    --secondary-color: #f4a261;
    --background: #f8f9fa;
    --card-background: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.header-top {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}

.user-email {
    font-size: 0.9rem;
    opacity: 0.9;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.btn-logout {
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    font-family: inherit;
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.logo-section h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Navigation */
.main-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.nav-btn.active {
    background: white;
    color: var(--primary-color);
    border-color: white;
    font-weight: 600;
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem 0;
}

/* Search Section */
.search-section {
    position: relative;
    margin-bottom: 2rem;
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--card-background);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 95, 63, 0.1);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    pointer-events: none;
}

/* Info Banner */
.info-banner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.category-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
    color: white;
    flex-shrink: 0;
}

.category-A {
    background: #007bff;
}

.category-B {
    background: #28a745;
}

.category-C {
    background: #ffc107;
    color: var(--text-primary);
}

.category-D {
    background: #fd7e14;
}

.category-E {
    background: #6f42c1;
}

/* Documents Grid */
.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.document-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.document-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.document-card.hidden {
    display: none;
}

.document-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.document-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.document-info {
    flex: 1;
    min-width: 0;
}

.document-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
    word-wrap: break-word;
}

.document-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.document-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.document-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    justify-content: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(30, 95, 63, 0.3);
}

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

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

/* No Results */
.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Login Screen */
.login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 2rem;
}

.login-container {
    width: 100%;
    max-width: 450px;
}

.login-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.login-header .subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.login-body h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.login-body > p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.login-footer {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.auth-error {
    margin-top: 1rem;
    padding: 1rem;
    background: #fee;
    border: 2px solid #fcc;
    border-radius: 8px;
    color: #c33;
    font-size: 0.9rem;
    text-align: left;
}

.auth-error strong {
    font-weight: 600;
}

/* Google Sign-In Button Container */
.g_id_signin {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
}

/* Main Content Wrapper */
.main-content {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-top {
        flex-direction: column;
    }
    
    .user-section {
        margin-left: 0;
        width: 100%;
        justify-content: space-between;
    }
    
    .login-card {
        padding: 2rem 1.5rem;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
    .header-content {
        text-align: center;
    }

    .main-nav {
        justify-content: center;
    }

    .nav-btn {
        font-size: 0.85rem;
        padding: 0.5rem 1rem;
    }

    .logo-section h1 {
        font-size: 1.5rem;
    }

    .info-banner {
        grid-template-columns: 1fr;
    }

    .documents-grid {
        grid-template-columns: 1fr;
    }

    .document-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    main {
        padding: 1rem 0;
    }

    .container {
        padding: 0 15px;
    }

    header {
        padding: 1.5rem 0;
    }

    .search-input {
        padding: 0.85rem 0.85rem 0.85rem 2.5rem;
    }
    
    .user-section {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn-logout {
        width: 100%;
    }
}

/* Loading Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.document-card {
    animation: fadeIn 0.3s ease;
}