/* --- Root Variables & Base Styles --- */
:root {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --border-radius: 8px;
    --transition-speed: 0.2s;

    /* Light Theme (Default) */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --accent-color-hover: #0056b3;
    --danger-color: #dc3545;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

html.dark-mode {
    /* Dark Theme */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2a2a2a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #3a3a3a;
    --accent-color: #0d6efd;
    --accent-color-hover: #3d8bfd;
    --danger-color: #f7685b;
    --shadow-color: rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* --- App Layout --- */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.app-header .logo h1 {
    font-size: 1.75rem;
    margin-bottom: 0.2rem;
}

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

.header-controls {
    display: flex;
    gap: 0.5rem;
}

.main-content {
    display: block;
}

/* --- Tab Navigation --- */
.main-nav {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.nav-tab {
    padding: 0.8rem 1.5rem;
    border: none;
    background-color: transparent;
    border-bottom: 3px solid transparent;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
}

.nav-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* --- Buttons & Inputs (UNIFIED) --- */
button, .button-like-label, select, input, textarea {
    font-family: inherit;
    font-size: 1rem;
    padding: 0.7rem 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-speed);
}
input::placeholder, textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

button, .button-like-label {
    cursor: pointer;
    background-color: var(--bg-tertiary);
}

button:hover, .button-like-label:hover {
    background-color: var(--border-color);
}

button:focus-visible, select:focus-visible, input:focus-visible, [contenteditable]:focus-visible, textarea:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

#theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    padding: 0.2rem;
}

.header-controls button, .header-controls .button-like-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    padding: 0.6rem 1.2rem;
}

/* --- Task Section --- */
.task-controls {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.multi-select-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.quick-add-form {
    display: flex;
    gap: 0.5rem;
}

#quick-add-input {
    flex-grow: 1;
}

#quick-add-btn {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

#quick-add-btn:hover {
    background-color: var(--accent-color-hover);
}

.filters-and-search {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filters-and-search input, .filters-and-search select {
    flex-grow: 1;
}

/* --- Task List --- */
.task-list-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.task-group {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow-color);
    padding: 1rem 1.5rem;
}

.task-group-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.task-group-title {
    font-size: 1.2rem;
    font-weight: 600;
}

.task-group-count {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    list-style: none;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
    animation: fadeIn 0.4s ease-out;
}
.task-item.selected {
    background-color: var(--accent-color-hover);
    border-color: var(--accent-color);
    color: white;
}
.task-item.selected .task-title, .task-item.selected .drag-handle {
    color: white;
}

.task-item.completed .task-title {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.task-item.dragging {
    opacity: 0.5;
    background: var(--bg-tertiary);
}

.task-item:hover {
    background-color: var(--bg-tertiary);
    box-shadow: 0 1px 4px var(--shadow-color);
}

.drag-handle {
    cursor: grab;
    color: var(--text-secondary);
}
.select-mode .drag-handle {
    display: none;
}

.task-checkbox {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.task-title {
    flex-grow: 1;
    font-weight: 500;
}

.priority-badge {
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: bold;
    color: #fff;
    white-space: nowrap;
}

.priority-badge[data-priority="High"] { background-color: #dc3545; }
.priority-badge[data-priority="Medium"] { background-color: #ffc107; color: #333; }
.priority-badge[data-priority="Low"] { background-color: #28a745; }

/* --- Meeting Tools --- */
.meeting-tools {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.timer-section, .notes-section {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow-color);
    padding: 1.5rem;
}

.timer-display {
    font-size: 3rem;
    font-weight: bold;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: 2px;
}

.timer-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.subtle-button {
    width: 100%;
    margin-top: 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.6rem;
    border-radius: var(--border-radius);
}
.subtle-button:hover {
    background-color: var(--border-color);
}

.notes-editor {
    min-height: 200px;
    padding: 0.75rem 1.25rem;
    background-color: var(--bg-primary);
    overflow-y: auto;
}
.notes-toolbar {
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}
.notes-toolbar button {
    padding: 0.3rem 0.7rem;
    font-size: 0.9rem;
}

/* --- Task Modal (UNIFIED & POLISHED) --- */
.modal-overlay {
    position: fixed; inset: 0; background-color: rgba(0, 0, 0, 0.6); display: flex; justify-content: center; align-items: center; z-index: 1000; opacity: 0; visibility: hidden; transition: opacity var(--transition-speed), visibility var(--transition-speed);
}
.modal-overlay:not([hidden]) { opacity: 1; visibility: visible; }

.modal-content {
    background-color: var(--bg-secondary); padding: 1.5rem 2rem; border-radius: var(--border-radius); width: 90%; max-width: 800px; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3); transform: scale(0.95); transition: transform var(--transition-speed); display: flex; flex-direction: column; max-height: 85vh;
}
.modal-overlay:not([hidden]) .modal-content { transform: scale(1); }

.modal-header {
    display: flex; justify-content: space-between; align-items: center; padding-bottom: 1rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border-color); flex-shrink: 0;
}
.modal-title-input {
    font-size: 1.5rem; font-weight: bold; border: none; outline: none; width: 100%; padding: 0.2rem; background: transparent; color: var(--text-primary);
}
.modal-close-btn {
    background: none; border: none; font-size: 2rem; line-height: 1; color: var(--text-secondary); padding: 0;
}

.modal-body-container {
    display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; flex-grow: 1; overflow-y: auto; padding: 0.2rem 0.5rem;
}
.modal-main-content { display: flex; flex-direction: column; gap: 1.5rem; }
.modal-sidebar { display: flex; flex-direction: column; gap: 1.5rem; padding-left: 1.5rem; border-left: 1px solid var(--border-color); }
.form-group label { display: block; margin-bottom: 0.6rem; font-weight: 500; font-size: 0.9rem; color: var(--text-secondary); }
.form-group.description-group { flex-grow: 1; display: flex; flex-direction: column; }
.form-group.description-group textarea { flex-grow: 1; height: 100%; background-color: var(--bg-primary); }

/* Status Toggle Styles */
.status-toggle {
    display: flex; align-items: center; gap: 0.75rem; background-color: var(--bg-tertiary); padding: 0.7rem 1rem; border-radius: var(--border-radius); cursor: pointer; border: 1px solid var(--border-color);
}

/* Calendar Icon Fix */
#modal-due-date { color-scheme: light; }
html.dark-mode #modal-due-date { background-color: var(--bg-tertiary); }
html.dark-mode #modal-due-date::-webkit-calendar-picker-indicator { filter: invert(1); }

/* Footer Button Styles */
.modal-footer {
    display: flex; justify-content: flex-end; align-items: center; gap: 0.75rem; padding-top: 1.5rem; margin-top: 1rem; border-top: 1px solid var(--border-color); flex-shrink: 0;
}
.btn-danger { background-color: var(--danger-color); border-color: var(--danger-color); color: white; }
.btn-danger:hover { background-color: var(--danger-color); opacity: 0.8; }
.btn-primary { background-color: var(--accent-color); border-color: var(--accent-color); color: white; }
.btn-primary:hover { background-color: var(--accent-color-hover); }

.inline-confirm {
    display: none;
    gap: 0.5rem;
    align-items: center;
}
.inline-confirm.active {
    display: flex;
}

/* --- Subtask Styles (POLISHED) --- */
.subtask-group {
    border-top: 1px solid var(--border-color); padding-top: 1.2rem; margin-top: 1rem;
}
.subtask-add-form {
    display: flex; gap: 0.5rem; margin-top: 1rem;
}
#subtask-input { flex-grow: 1; }
.subtask-item {
    display: flex; align-items: center; gap: 0.75rem; padding: 0.6rem 0.8rem; background-color: var(--bg-primary); border-radius: var(--border-radius); position: relative;
}
.subtask-item.completed .subtask-title { text-decoration: line-through; color: var(--text-secondary); }
.subtask-title { flex-grow: 1; }
.subtask-delete-btn {
    position: absolute; top: 50%; right: 0.5rem; transform: translateY(-50%); background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1.2rem; padding: 0; opacity: 0; transition: opacity 0.2s ease;
}
.subtask-item:hover .subtask-delete-btn { opacity: 1; }
.subtask-delete-btn:hover { color: var(--danger-color); }
.subtask-checkbox { margin-right: 0.25rem; }

/* --- Other Styles --- */
.toggle-switch-container { display: flex; align-items: center; gap: 0.75rem; padding: 0.6rem 1rem; border: 1px solid var(--border-color); border-radius: var(--border-radius); background-color: var(--bg-secondary); }
.toggle-label { font-size: 0.9rem; color: var(--text-secondary); cursor: pointer; margin: 0; }
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--bg-tertiary); transition: .4s; border-radius: 24px; }
.slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent-color); }
input:checked + .slider:before { transform: translateX(20px); }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background-color: var(--bg-secondary); color: var(--text-primary); padding: 1rem 1.5rem; border-radius: var(--border-radius); box-shadow: 0 4px 12px var(--shadow-color); z-index: 2000; opacity: 0; visibility: hidden; transition: opacity 0.3s, transform 0.3s, bottom 0.3s; }
.toast.show { opacity: 1; visibility: visible; bottom: 30px; }
.toast.error { background-color: var(--danger-color); color: white; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.empty-state-container { text-align: center; padding: 3rem 1rem; background-color: var(--bg-secondary); border-radius: var(--border-radius); margin-top: 1rem; }
.empty-state-icon { font-size: 3rem; margin-bottom: 1rem; }
.overdue-indicator { font-size: 0.75rem; font-weight: 600; color: var(--danger-color); margin-left: auto; margin-right: 0.5rem; white-space: nowrap; }

/* --- Responsive Media Queries --- */
@media (max-width: 768px) {
    .modal-body-container { grid-template-columns: 1fr; }
    .modal-sidebar { border-left: none; padding-left: 0; }
}
@media (max-width: 576px) {
    .app-container { padding: 1rem; }
    .app-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .filters-and-search { flex-direction: column; }
    .modal-content { width: 95%; padding: 1.5rem; }
    .modal-footer { flex-direction: row; justify-content: space-between; }
}
/* --- App Footer (NEW) --- */
.app-footer {
    text-align: center;
    padding: 2rem 1rem 1.5rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    margin-top: 0.5rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.footer-links a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.app-footer {
  text-align: center;
  padding: 15px;
  background: #111;
  color: #fff;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 10px;
}

.footer-icon {
  width: 50px;
  height: 50px;
}