/* --- THEME VARIABLES --- */
:root {
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* Light Theme */
    --bg-gradient: radial-gradient(circle, #edf2f7 0%, #f4f7f9 100%);
    --bg-primary: #f8fafc; /* Slightly off-white for inset effect */
    --bg-secondary: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --primary-color: #3182ce;
    --primary-hover: #2b6cb0;
    --danger-color: #e53e3e;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --folder-color: #f6ad55;
    --file-color: #4fd1c5;
    --copied-bg-color: hsla(207, 65%, 55%, 0.1);
}

[data-theme="dark"] {
    --bg-gradient: radial-gradient(circle, #2d3748 0%, #1a202c 100%);
    --bg-primary: #1a202c; /* Darker for inset effect */
    --bg-secondary: #2d3748;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --border-color: #4a5568;
    --primary-color: #63b3ed;
    --primary-hover: #4299e1;
    --danger-color: #fc8181;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --copied-bg-color: hsla(207, 75%, 65%, 0.15);
}

/* --- GENERAL STYLES --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: var(--font-sans);
    background: var(--bg-gradient);
    color: var(--text-primary);
    transition: background-color 0.3s var(--ease-out), color 0.3s var(--ease-out);
    min-height: 100vh;
}
.app-container { max-width: 1400px; margin: 2rem auto; padding: 0 2rem; }

/* --- HEADER & BREADCRUMBS --- */
.app-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.breadcrumbs { display: flex; align-items: center; font-size: 1.2rem; font-weight: 500; flex-wrap: wrap; }
.breadcrumb-item { color: var(--text-secondary); cursor: pointer; }
.breadcrumb-item:hover { color: var(--primary-color); }
.breadcrumb-item::after { content: '/'; margin: 0 0.75rem; color: var(--border-color); }
.breadcrumb-item:last-child { color: var(--text-primary); font-weight: 600; }
.breadcrumb-item:last-child::after { display: none; }

/* --- THEME TOGGLE --- */
#theme-toggle-btn {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    width: 40px; height: 40px; border-radius: 50%; cursor: pointer;
    display: flex; justify-content: center; align-items: center; font-size: 1.2rem;
    color: var(--text-secondary);
}
#theme-toggle-btn .fa-sun { display: none; }
#theme-toggle-btn .fa-moon { display: block; }
[data-theme="dark"] #theme-toggle-btn .fa-sun { display: block; }
[data-theme="dark"] #theme-toggle-btn .fa-moon { display: none; }

/* --- FILE MANAGER GRID (FIXED SIZE) --- */
.file-manager-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, 150px); /* Fixed width */
    gap: 1.25rem;
    min-height: 60vh;
}
.grid-item {
    background-color: var(--bg-secondary); border: 1px solid var(--border-color);
    border-radius: 8px; padding: 0.75rem; text-align: center; cursor: pointer;
    transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
    position: relative; display: flex; flex-direction: column; align-items: center;
    justify-content: center; /* Vertically center content */
    box-shadow: 0 4px 6px -1px var(--shadow-color);
    height: 120px; /* Fixed height */
}
.grid-item:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px var(--shadow-color); }
.grid-item .icon { font-size: 2.5em; margin-bottom: 0.5rem; }
.folder-icon { color: var(--folder-color); }
.file-icon { color: var(--file-color); }
.grid-item .name { word-break: break-word; font-weight: 500; font-size: 0.85rem; }
.grid-item .rename-input {
    width: 100%; border: 2px solid var(--primary-color); border-radius: 5px;
    padding: 0.4rem; text-align: center; font-size: 0.85rem;
}
.add-new-card {
    border: 2px dashed var(--border-color); background: transparent; box-shadow: none;
    color: var(--text-secondary);
}
.add-new-card:hover { border-color: var(--primary-color); color: var(--primary-color); }
.add-new-card .icon { font-size: 2em; }

/* --- MODALS --- */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.6); backdrop-filter: blur(5px);
    display: none; justify-content: center; align-items: center; z-index: 1000;
    opacity: 0; transition: opacity 0.3s var(--ease-out);
}
.modal-overlay.visible { display: flex; opacity: 1; }
.modal-content {
    background-color: var(--bg-secondary); border-radius: 12px;
    box-shadow: 0 20px 25px -5px var(--shadow-color);
    width: 80vw; height: 85vh; display: flex; flex-direction: column;
    transform: scale(0.95); transition: transform 0.3s var(--ease-out);
}
.modal-overlay.visible .modal-content { transform: scale(1); }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.5rem; border-bottom: 1px solid var(--border-color); }
.modal-header h2 { font-size: 1.2rem; }
.header-actions { display: flex; align-items: center; gap: 1.5rem; }
.icon-btn { background: none; border: none; font-size: 1.2rem; color: var(--text-secondary); cursor: pointer; }
.modal-body { flex-grow: 1; position: relative; overflow: hidden; }
.modal-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 0.75rem; }
button { font-family: var(--font-sans); font-size: 0.9rem; font-weight: 600; padding: 0.6rem 1.2rem; border-radius: 6px; cursor: pointer; transition: all 0.2s; }
.close-btn { background: none; border: none; font-size: 2rem; color: var(--text-secondary); }
.primary-btn { background-color: var(--primary-color); color: white; border: none; }
.primary-btn:hover { background-color: var(--primary-hover); }

/* --- EDITOR & PARAGRAPH VIEW --- */
#modal-textarea { width: 100%; height: 100%; resize: none; border: none; outline: none; font-size: 16px; line-height: 1.7; background: transparent; color: var(--text-primary); padding: 1.5rem; }
#modal-paragraph-view { height: 100%; overflow-y: auto; cursor: pointer; padding: 1.5rem; background-color: var(--bg-primary); }
.paragraph-container { display: flex; align-items: flex-start; gap: 1rem; padding: 1rem; border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 1rem; position: relative; background-color: var(--bg-secondary); transition: background-color 0.3s; }
.paragraph-container.copied { background-color: var(--copied-bg-color); }
.paragraph-number { font-weight: 600; color: var(--primary-color); min-width: 20px; }
.paragraph-text { flex-grow: 1; line-height: 1.6; }
.paragraph-container:hover .copy-icon { opacity: 1; }
.copy-icon { position: absolute; top: 10px; right: 10px; background: var(--bg-primary); border: 1px solid var(--border-color); padding: 5px 8px; border-radius: 50%; cursor: pointer; opacity: 0; transition: opacity 0.2s; }

/* --- TOGGLE SWITCH --- */
.view-toggle { display: flex; align-items: center; gap: 10px; }
.switch { position: relative; display: inline-block; width: 50px; height: 28px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; inset: 0; background-color: var(--text-secondary); transition: .4s; border-radius: 28px; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(22px); }

/* --- CONTEXT MENU --- */
.context-menu {
    position: fixed; z-index: 1001; background-color: var(--bg-secondary);
    border-radius: 8px; box-shadow: 0 10px 15px -3px var(--shadow-color);
    border: 1px solid var(--border-color); padding: 0.5rem 0; min-width: 180px;
    display: none;
}
.context-menu ul { list-style: none; }
.context-menu li { padding: 0.6rem 1.2rem; cursor: pointer; display: flex; align-items: center; gap: 0.75rem; }
.context-menu li:hover { background-color: var(--bg-primary); }
.context-menu li.delete { color: var(--danger-color); }

/* --- TOAST NOTIFICATION --- */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translate(-50%, 10px);
    background-color: var(--text-primary);
    color: var(--bg-secondary);
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, transform 0.3s, visibility 0.3s var(--ease-out);
}
.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}