:root {
    --bg-main: #1e1e1e;
    --bg-sidebar: #252526;
    --bg-panel: #2d2d2d;
    --bg-hover: #3e3e42;
    --bg-input: #3c3c3c;
    --border-color: #454545;
    --text-primary: #cccccc;
    --text-secondary: #969696;
    --text-white: #ffffff;
    --accent: #0e639c;
    --accent-hover: #1177bb;
    --error: #f48771;
    --success: #89d185;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-family);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    color: var(--text-white);
    font-size: 1.25rem;
    font-weight: 600;
}

.version {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
    display: block;
}

.nav-links {
    list-style: none;
    padding: 10px 0;
    margin: 0;
}

.nav-links li {
    padding: 12px 20px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    transition: background-color 0.2s ease;
}

.nav-links li:hover {
    background-color: var(--bg-hover);
}

.nav-links li.active {
    background-color: var(--bg-hover);
    color: var(--text-white);
    border-left: 3px solid var(--accent);
}

.nav-links li .icon {
    margin-right: 10px;
    font-size: 1.1rem;
}

/* Main Content Area */
.content-area {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    background-color: var(--bg-main);
}

.tab-pane {
    display: none;
    max-width: 700px;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.15s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    margin-bottom: 30px;
}

header h2 {
    font-size: 1.8rem;
    color: var(--text-white);
    margin-bottom: 8px;
    font-weight: 500;
}

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

/* Process Tab - Upload */
.upload-box {
    border: 2px dashed var(--border-color);
    border-radius: 6px;
    padding: 50px 20px;
    text-align: center;
    background-color: var(--bg-panel);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    margin-bottom: 20px;
}

.upload-box:hover, .upload-box.dragover {
    border-color: var(--accent);
    background-color: var(--bg-hover);
}

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

.upload-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 15px;
}

.upload-content h3 {
    color: var(--text-white);
    margin-bottom: 5px;
    font-weight: 500;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-panel);
    padding: 12px 15px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.file-info.hidden {
    display: none;
}

.action-bar {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

#status-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Settings Form */
.settings-form {
    background-color: var(--bg-panel);
    padding: 25px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-white);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    padding: 10px 12px;
    color: var(--text-white);
    border-radius: 3px;
    font-size: 0.95rem;
    font-family: var(--font-family);
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group small {
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.form-row {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 10px;
}

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 3px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.2s;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.btn-primary:disabled {
    background-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
    color: var(--text-white);
}

.btn-clear {
    background: none;
    border: none;
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: underline;
}

/* Utilities */
.text-error { color: var(--error); }
.text-success { color: var(--success); }

/* About Card */
.card {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 25px;
}

.card h3 {
    color: var(--text-white);
    margin-bottom: 10px;
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 15px 0;
}

.author {
    font-weight: 500;
}

.secondary-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}