:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #334155;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    height: 100vh;
    overflow: hidden; /* App-like feel */
}

/* --- Login Overlay --- */
.login-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.5s;
}

.login-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.login-card {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.login-card h1 {
    font-family: var(--font-heading);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.google-btn {
    margin-top: 2rem;
    background: white;
    color: #333;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 2rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.2s;
}

.google-btn:hover { transform: scale(1.05); }
.google-btn img { width: 20px; }

/* --- Main App Layout --- */
.app-container {
    display: flex;
    height: 100vh;
}
.app-container.hidden { display: none; }

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1rem;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.icon-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    width: 30px; height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex; align-items: center; justify-content: center;
}

.btn-danger {
    background: transparent;
    color: #ef4444;
    margin-left: 1rem;
    transition: all 0.2s;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    display: flex; flex-direction: column; gap: 0.5rem;
}

.note-item {
    padding: 0.8rem;
    border-radius: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.note-item:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }
.note-item.active { background: rgba(59, 130, 246, 0.2); color: var(--accent-color); border-left: 3px solid var(--accent-color); }

.user-profile {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.8rem;
}

#userAvatar { width: 32px; height: 32px; border-radius: 50%; }
.logout-btn {
    background: transparent; border: 1px solid var(--border-color);
    color: var(--text-secondary); padding: 0.2rem 0.5rem; border-radius: 0.3rem;
    cursor: pointer; margin-left: auto;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.header-content { display: flex; justify-content: space-between; align-items: center; }

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-shrink: 0;
    margin-left: 1rem;
}

.title-input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-size: 1.5rem;
    width: 100%;
}
.title-input:focus { outline: none; }

.status-indicator {
    font-size: 0.8rem; color: var(--text-secondary);
}

/* Editor Section */
.editor-section {
    flex: 1;
    display: flex; flex-direction: column;
    padding: 1rem 2rem;
    overflow: hidden;
}

.mode-switch {
    display: flex; gap: 1rem; margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.mode-btn {
    background: transparent; border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-weight: 600;
    border-bottom: 2px solid transparent;
}

.mode-btn.active { color: var(--accent-color); border-bottom-color: var(--accent-color); }

.view-pane {
    flex: 1; overflow-y: auto;
    padding-bottom: 2rem;
}
.view-pane.hidden { display: none; }

textarea {
    width: 100%; height: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem; line-height: 1.6;
    resize: none;
}
textarea:focus { outline: none; }

/* Keep previous content styles (Table, Heading etc) */
.parsed-heading {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-top: 1.5rem; padding: 1rem;
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.1), transparent);
    border-left: 4px solid var(--accent-color);
    border-radius: 0 0.5rem 0.5rem 0; cursor: pointer;
}
.table-container { overflow-x: auto; border: 1px solid var(--border-color); border-radius: 0.5rem; margin-top: 1rem;}
table { width: 100%; border-collapse: collapse; min-width: 600px; }
th, td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); }
th { background: rgba(0,0,0,0.2); }
td.playable-cell { color: var(--accent-color); font-weight: 600; cursor: pointer; }
td.playable-cell:hover { text-decoration: underline; }
.spanish-line { font-size: 1.25rem; color: var(--text-primary); margin-top: 1rem; cursor: pointer; }
.spanish-line:hover { color: var(--accent-color); }
.chinese-line { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1rem; }
.voice-controls { margin-bottom: 1rem; color: var(--text-secondary); }
select { background: var(--bg-color); color: white; border: 1px solid var(--border-color); padding: 0.3rem; border-radius: 0.3rem; }
.playing { color: #10b981 !important; transition: color 0.2s; }

/* --- UX Improvement: Prevent selecting UI elements --- */
body {
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none;    /* Firefox */
    -ms-user-select: none;     /* IE10+/Edge */
    user-select: none;         /* Standard */
}

/* Re-enable selection ONLY for content areas */
textarea, 
#contentDisplay, 
.text-block, 
.parsed-heading, 
table, 
.spanish-line, 
.chinese-line,
.title-input {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
    cursor: text; /* Show text cursor */
}

/* Sidebar items should be clickable but not text-selectable */
.note-item {
    cursor: pointer;
}