@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-color: #f8f9fa;
    --sidebar-bg: #1e293b;
    --sidebar-text: #e2e8f0;
    --sidebar-text-hover: #ffffff;
    --accent-color: #3b82f6;
    --accent-color-hover: #2563eb;
    --text-color: #1e293b;
    --border-color: #e5e7eb;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1.5rem;
    position: fixed;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.sidebar-header h2 {
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav a {
    display: block;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: 6px;
    text-decoration: none;
    color: var(--sidebar-text);
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.sidebar-nav a:hover {
    background-color: #334155;
    color: var(--sidebar-text-hover);
}

.sidebar-nav a.active {
    background-color: var(--accent-color);
    color: var(--sidebar-text-hover);
}

.main-content {
    flex-grow: 1;
    margin-left: 260px;
    padding: 2rem;
}

.tool-panel {
    display: none;
}

.tool-panel.active {
    display: block;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.tool-panel > p {
    font-size: 1.1rem;
    color: #4b5563;
    margin-bottom: 2rem;
    max-width: 70ch;
}

.form-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    max-width: 800px;
}

.file-drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    background-color: #fdfdff;
    margin-bottom: 1.5rem;
    position: relative;
    transition: border-color 0.2s, background-color 0.2s;
}

.file-drop-zone.drag-over {
    border-color: var(--accent-color);
    background-color: #f0f5ff;
}

.file-drop-zone input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-drop-zone p {
    font-weight: 500;
    color: #6b7280;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

input[type="text"],
textarea {
    width: 100%;
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4);
}

textarea {
    resize: vertical;
    margin-bottom: 1.5rem;
}

button[type="submit"] {
    display: block;
    width: 100%;
    padding: 0.85rem;
    border: none;
    border-radius: 6px;
    background-color: var(--accent-color);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

button[type="submit"]:hover {
    background-color: var(--accent-color-hover);
}

.results-card {
    margin-top: 2rem;
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    max-width: 800px;
}

.results-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

#results-content pre {
    background-color: #f3f4f6;
    padding: 1rem;
    border-radius: 6px;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'Fira Code', monospace;
}

#results-content a {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: background-color 0.2s;
}

#results-content a:hover {
    background-color: var(--accent-color-hover);
}

.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        height: auto;
    }

    .main-content {
        margin-left: 0;
        padding: 1.5rem;
    }
}