:root {
    --bg-color: #1a1b26;
    --panel-bg-color: rgba(40, 42, 54, 0.6);
    --border-color: rgba(189, 147, 249, 0.2);
    --text-color: #c0caf5;
    --text-color-dark: #a9b1d6;
    --primary-color: #bb9af7; /* Purple */
    --primary-hover-color: #9d7cd8;
    --secondary-color: #7aa2f7; /* Blue */
    --danger-color: #f7768e; /* Red */
    --accent-color: #0db9d7; /* Cyan */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --border-radius: 12px;
    --backdrop-blur: 10px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 10% 10%, rgba(189, 147, 249, 0.1) 0%, transparent 30%),
        radial-gradient(circle at 80% 90%, rgba(122, 162, 247, 0.1) 0%, transparent 30%);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    min-height: 100vh;
    font-size: 16px;
}

.container { max-width: 1200px; margin: 0 auto; }
.main-header { text-align: center; margin-bottom: 2.5rem; }
.main-header h1 { font-size: 2.5rem; font-weight: 700; color: #fff; margin: 0 0 0.5rem; }
.main-header .emoji { font-family: 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; }
.main-header p { font-size: 1.1rem; color: var(--text-color-dark); max-width: 600px; margin: 0 auto; }

.main-content { display: flex; flex-direction: column; gap: 1.5rem; max-width: 900px; margin: 0 auto;}

.panel {
    background: var(--panel-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    backdrop-filter: blur(var(--backdrop-blur));
    -webkit-backdrop-filter: blur(var(--backdrop-blur));
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
}

.panel-header { padding: 1rem 1.5rem; border-bottom: 1px solid var(--border-color); }
.panel-header h2 { margin: 0; font-size: 1.25rem; display: flex; align-items: center; gap: 0.75rem; color: #fff; }
.panel-header .step {
    background-color: var(--primary-color);
    color: var(--bg-color);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
}
.panel-content { padding: 1.5rem; }

/* --- Mode Selector --- */
.mode-selector { display: flex; width: 100%; background-color: rgba(0,0,0,0.2); border-radius: 10px; border: 1px solid var(--border-color); padding: 0.25rem; }
.mode-btn { flex: 1; padding: 0.75rem 1rem; background-color: transparent; border: none; color: var(--text-color-dark); font-size: 1rem; font-weight: 600; cursor: pointer; border-radius: 8px; transition: all 0.3s ease; display: flex; align-items: center; justify-content: center; gap: 0.75rem; }
.mode-btn:hover { background-color: rgba(255,255,255,0.05); }
.mode-btn.active { background-color: var(--primary-color); color: var(--bg-color); box-shadow: 0 4px 15px rgba(187, 154, 247, 0.2); }
.mode-description { text-align: center; margin: 1rem 0 0; color: var(--text-color-dark); font-size: 0.9rem; }

/* --- Forms & Inputs --- */
.form-group { position: relative; display: flex; flex-direction: column; gap: 0.5rem; }
.input-with-button { position: relative; }
.clear-btn { position: absolute; top: 10px; right: 10px; background: none; border: none; color: var(--text-color-dark); font-size: 1.2rem; cursor: pointer; transition: color 0.2s; line-height: 1; padding: 0.25rem 0.5rem; }
.clear-btn:hover { color: var(--danger-color); }
.input-link-info { text-align: center; padding-top: 0.75rem; font-size: 0.9rem; color: var(--text-color-dark); min-height: 1.5em; }
.input-link-info span { color: var(--text-color); font-weight: 700; }

textarea { width: 100%; background-color: rgba(0,0,0,0.2); border: 1px solid var(--border-color); border-radius: 8px; padding: 0.75rem; color: var(--text-color); font-size: 1rem; transition: all 0.2s ease; resize: vertical; }
textarea:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(187, 154, 247, 0.3); }

/* --- Spinner --- */
.spinner-overlay { position: absolute; inset: 0; background: rgba(40, 42, 54, 0.8); border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.spinner { width: 40px; height: 40px; border: 4px solid var(--border-color); border-top-color: var(--primary-color); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Buttons --- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.6rem 1.2rem; border-radius: 8px; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: all 0.2s ease; border: none; text-decoration: none; white-space: nowrap; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.btn-primary { background-color: var(--primary-color); color: var(--bg-color); }
.btn.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover-color); }
.btn.btn-secondary { background-color: var(--secondary-color); color: #fff; }
.btn.btn-secondary:hover:not(:disabled) { background-color: #5d83d1; }
.btn.btn-danger { background-color: var(--danger-color); color: #fff; }
.btn.btn-danger:hover:not(:disabled) { background-color: #d96277; }
.btn.btn-small { padding: 0.4rem 0.8rem; font-size: 0.85rem; }
.btn.btn-full-width { width: 100%; }
.btn svg { vertical-align: middle; flex-shrink: 0; }

/* --- Manual Workbench --- */
.panel-workbench { max-width: 1200px; width: 100%; }
.panel-workbench .panel-content { 
    display: grid; 
    grid-template-columns: 1fr 1.5fr; 
    gap: 1.5rem;
    height: calc(100vh - 350px); /* MODIFIED: Made taller for desktop */
    min-height: 500px;
}
.tracker-column { display: flex; flex-direction: column; min-height: 0; }
.available-trackers-content { display: flex; flex-direction: column; min-height: 0; flex-grow: 1; }

.list-header { display: flex; justify-content: space-between; align-items: center; flex-shrink: 0; margin-bottom: 1rem; }
.list-header h3 { margin: 0; font-size: 1.1rem; }
.action-buttons { display: flex; gap: 0.5rem; justify-content: flex-end; }
.action-buttons-footer { display: flex; gap: 0.75rem; margin-top: auto; padding-top: 1rem; }

.predefined-sources { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 1rem; }
.predefined-sources label { font-weight: 600; font-size: 0.9rem; color: var(--text-color-dark); margin-bottom: 0.25rem; }
.predefined-sources div { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.preset-btn { background: none; border: 1px solid var(--secondary-color); color: var(--secondary-color); border-radius: 6px; padding: 0.4rem 0.8rem; font-size: 0.85rem; cursor: pointer; transition: all 0.2s ease; }
.preset-btn:hover { background-color: var(--secondary-color); color: #fff; }

#source-list { display: flex; flex-direction: column; gap: 0.5rem; }
.source-input-wrapper { display: flex; align-items: center; gap: 0.5rem; }
.source-input-wrapper input { flex-grow: 1; margin: 0; }
.source-controls { display: flex; gap: 0.75rem; }

.tracker-list { list-style: none; padding: 0.5rem; margin: 0; overflow-y: auto; background: rgba(0,0,0,0.2); border-radius: 8px; border: 1px solid var(--border-color); flex-grow: 1; min-height: 0; }
.tracker-list::-webkit-scrollbar { width: 8px; }
.tracker-list::-webkit-scrollbar-track { background: transparent; }
.tracker-list::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
.tracker-list li { font-size: 0.85rem; padding: 0.6rem 0.8rem; border-radius: 6px; word-break: break-all; cursor: pointer; transition: background-color 0.2s; }
.tracker-list li:hover { background-color: rgba(189, 147, 249, 0.15); }
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-color-dark); font-size: 0.9rem; height: 100%; display: flex; align-items: center; justify-content: center; }

/* --- Output Panel --- */
.output-stats { margin-bottom: 1rem; text-align: center; font-size: 0.95rem; color: var(--text-color-dark); background: rgba(0,0,0,0.2); padding: 0.75rem; border-radius: 8px; }
.output-stats span { color: var(--text-color); font-weight: 700; }
.output-stats .added { color: var(--accent-color); }
.output-stats .removed { color: var(--danger-color); }

/* --- Toast Notifications & Footer --- */
#toast-container { position: fixed; top: 20px; right: 20px; z-index: 1000; display: flex; flex-direction: column; gap: 0.75rem; }
.toast { padding: 1rem 1.5rem; border-radius: 8px; color: #fff; font-weight: 600; box-shadow: 0 4px 12px rgba(0,0,0,0.3); opacity: 0; transform: translateX(100%); transition: all 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55); }
.toast.show { opacity: 1; transform: translateX(0); }
.toast.success { background-color: var(--accent-color); }
.toast.error { background-color: var(--danger-color); }
.toast.info { background-color: var(--secondary-color); }

footer { text-align: center; margin-top: 2rem; padding: 1rem; color: var(--text-color-dark); }
footer a { color: var(--primary-color); text-decoration: none; font-weight: 600; transition: color 0.2s ease; }
footer a:hover { color: var(--primary-hover-color); }

@media (min-width: 1200px) {
    #manual-workbench-container {
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    body { padding: 1rem; }
    .main-header h1 { font-size: 2rem; }
    .panel-workbench .panel-content { grid-template-columns: 1fr; height: auto; min-height: 0; }
    .mode-selector { flex-direction: column; }
    .tracker-list { height: 250px; flex-grow: 0; } 
}