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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

main {
    padding: 30px;
}

.section {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid #e0e0e0;
}

.section:last-child {
    border-bottom: none;
}

.section h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.8em;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input[type="file"],
.form-group select,
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s;
    font-family: inherit;
}

.form-group input[type="file"]:focus,
.form-group select:focus,
.form-group input[type="number"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-hint {
    display: block;
    margin-top: 5px;
    font-size: 0.85em;
    color: #666;
    font-style: italic;
}

.page-range {
    display: block;
    margin-top: 5px;
    font-size: 0.9em;
    color: #666;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.status-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 6px;
    display: none;
}

.status-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.status-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

.pdfs-list {
    display: grid;
    gap: 15px;
}

.pdf-item {
    padding: 15px;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid #667eea;
}

.pdf-item h3 {
    color: #333;
    margin-bottom: 5px;
}

.pdf-item p {
    color: #666;
    font-size: 0.9em;
}

.empty-message {
    color: #999;
    font-style: italic;
    text-align: center;
    padding: 20px;
}

.summary-result {
    margin-top: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid #667eea;
    display: none;
}

.summary-result.show {
    display: block;
}

.summary-result h3 {
    color: #667eea;
    margin-bottom: 15px;
}

.summary-result .summary-content {
    line-height: 1.6;
    color: #333;
    white-space: pre-wrap;
}

.summary-result .loading {
    text-align: center;
    color: #666;
    font-style: italic;
}

/* Usage Widget */
.usage-widget {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 6px;
    border-left: 4px solid #667eea;
}

.usage-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.usage-text {
    font-size: 1.1em;
    color: #333;
    font-weight: 600;
}

.usage-progress {
    width: 100%;
    height: 24px;
    background: #e0e0e0;
    border-radius: 12px;
    overflow: hidden;
    margin-top: 10px;
}

.usage-progress-bar {
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.85em;
    font-weight: 600;
}

.usage-progress-bar.warning {
    background: linear-gradient(135deg, #ffc107 0%, #ff9800 100%);
}

.usage-progress-bar.danger {
    background: linear-gradient(135deg, #f44336 0%, #d32f2f 100%);
}

.usage-loading {
    text-align: center;
    color: #666;
    font-style: italic;
}

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

/* Skeleton Loader */
.skeleton-loader {
    display: grid;
    gap: 15px;
}

.skeleton-item {
    height: 80px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
    border-radius: 6px;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: white;
    padding: 16px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 300px;
    max-width: 400px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease-out;
}

.toast.success {
    border-left: 4px solid #28a745;
}

.toast.error {
    border-left: 4px solid #dc3545;
}

.toast.info {
    border-left: 4px solid #17a2b8;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-icon {
    font-size: 1.5em;
}

.toast-content {
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    font-size: 1.2em;
    cursor: pointer;
    color: #666;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2em;
    }

    header p {
        font-size: 1em;
    }

    main {
        padding: 20px;
    }

    .section h2 {
        font-size: 1.5em;
    }

    .container {
        border-radius: 8px;
    }

    .usage-stats {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .toast-container {
        top: 10px;
        right: 10px;
        left: 10px;
    }

    .toast {
        min-width: auto;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    header {
        padding: 20px;
    }

    header h1 {
        font-size: 1.5em;
    }

    main {
        padding: 15px;
    }

    .btn {
        width: 100%;
        padding: 14px 24px;
    }

    .form-group input[type="file"],
    .form-group select,
    .form-group input[type="number"],
    .form-group textarea {
        padding: 10px;
    }
}