/* TaskFlow Theme Tokens */
:root {
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent: #2dd4bf;
    --accent-hover: #14b8a6;
    --accent-text: #0f172a;
    --input-bg: #f1f5f9;
    --hover-bg: #f1f5f9;
    --low-color: #22c55e;
    --medium-color: #eab308;
    --high-color: #ef4444;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --drawer-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-main: #161616;
    --card-bg: #222222;
    --card-border: #2e2e2e;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent: #36a2a4;
    --accent-hover: #2ca5a7;
    --accent-text: #ffffff;
    --input-bg: #1a1a1a;
    --hover-bg: #2c2c2c;
    --low-color: #4ade80;
    --medium-color: #facc15;
    --high-color: #f87171;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --drawer-shadow: -10px 0 30px rgba(0, 0, 0, 0.6);
}

* {
    box-sizing: border-box;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    background-color: var(--bg-main);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
}

/* Authentication Page Styles */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top right, rgba(54, 162, 164, 0.15), transparent), var(--bg-main);
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 420px;
}

.auth-header-bar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 12px;
}

.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 32px 28px;
    box-shadow: var(--card-shadow);
}

.auth-brand {
    text-align: center;
    margin-bottom: 24px;
}

.auth-brand .brand-logo {
    width: 44px;
    height: 44px;
    background: var(--accent);
    color: #ffffff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 24px;
    margin: 0 auto 12px auto;
}

.auth-brand h2 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
    font-family: 'Playfair Display', Georgia, serif;
    font-style: italic;
}

.auth-brand p {
    margin: 6px 0 0 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-tabs {
    display: flex;
    background: var(--input-bg);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 20px;
}

.auth-tab {
    flex: 1;
    padding: 8px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.auth-tab.active {
    background: var(--card-bg);
    color: var(--accent);
    box-shadow: var(--card-shadow);
}

.auth-alert {
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
}

.auth-alert.error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--high-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.auth-alert.success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--low-color);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input {
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 14px;
    color: var(--text-primary);
    outline: none;
}

.form-group input:focus {
    border-color: var(--accent);
}

.auth-submit-btn {
    width: 100%;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 10px;
    padding: 12px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    margin-top: 8px;
}

.auth-submit-btn:hover {
    background: var(--accent-hover);
}

/* TaskFlow Main Dashboard Container */
.taskflow-app {
    max-width: 840px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* Navbar Header */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo-box {
    width: 38px;
    height: 38px;
    background: var(--accent);
    color: #ffffff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-style: italic;
    font-weight: 600;
    font-size: 28px;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 18px;
}

.user-greeting {
    font-size: 14px;
    color: var(--text-secondary);
}

.user-greeting strong {
    color: var(--text-primary);
    font-weight: 600;
}

.account-menu-wrapper {
    position: relative;
}

.account-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}

.account-btn:hover {
    color: var(--text-primary);
}

.account-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 220px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 8px;
    box-shadow: var(--card-shadow);
    z-index: 50;
}

.account-dropdown.active {
    display: block;
}

.dropdown-header {
    padding: 8px 10px;
}

.dropdown-username {
    font-weight: 700;
    font-size: 14px;
    color: var(--text-primary);
}

.dropdown-useremail {
    font-size: 12px;
    color: var(--text-muted);
}

.dropdown-divider {
    height: 1px;
    background: var(--card-border);
    margin: 6px 0;
}

.dropdown-item {
    width: 100%;
    padding: 8px 10px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    text-align: left;
}

.dropdown-item:hover {
    background: var(--hover-bg);
}

.dropdown-item.danger {
    color: var(--high-color);
}

.dropdown-item.danger:hover {
    background: rgba(239, 68, 68, 0.12);
}

.theme-icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.theme-icon-btn:hover {
    color: var(--text-primary);
    background: var(--hover-bg);
}

/* Stat Cards (3 Column Grid) */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 20px 24px;
    box-shadow: var(--card-shadow);
}

.stat-value {
    font-size: 38px;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    margin-top: 8px;
}

/* Progress Track */
.progress-section {
    margin-bottom: 30px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.progress-percent {
    color: var(--accent);
    font-weight: 700;
}

.progress-track {
    width: 100%;
    height: 6px;
    background: var(--card-border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.4s ease;
}

/* Add Task Box */
.add-task-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 18px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.add-task-top {
    display: flex;
    gap: 12px;
}

#taskContentInput {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 12px 18px;
    font-size: 15px;
    color: var(--text-primary);
    outline: none;
}

#taskContentInput:focus {
    border-color: var(--accent);
}

.add-task-submit-btn {
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 12px;
    padding: 12px 24px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
}

.add-task-submit-btn:hover {
    background: var(--accent-hover);
}

.add-task-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.priority-selector, .due-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.selector-label {
    font-weight: 500;
}

.priority-pill {
    background: transparent;
    border-radius: 20px;
    padding: 4px 14px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
}

.priority-pill.low { border-color: var(--low-color); color: var(--low-color); }
.priority-pill.medium { border-color: var(--medium-color); color: var(--medium-color); }
.priority-pill.high { border-color: var(--high-color); color: var(--high-color); }

.priority-pill.active.low { background: rgba(74, 222, 128, 0.15); }
.priority-pill.active.medium { background: rgba(250, 204, 21, 0.15); }
.priority-pill.active.high { background: rgba(248, 113, 113, 0.15); }

.due-date-input {
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 4px 10px;
    font-size: 13px;
    outline: none;
}

/* Controls Row (Filter Pills & Sort) */
.controls-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.filter-pills {
    display: flex;
    gap: 8px;
}

.filter-pill {
    background: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    border-radius: 20px;
    padding: 6px 16px;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
}

.filter-pill:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.filter-pill.active {
    background: var(--accent);
    color: var(--accent-text);
    border-color: var(--accent);
}

.sort-select {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 6px 14px;
    font-size: 13.5px;
    outline: none;
    cursor: pointer;
}

/* Task List */
.task-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.task-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: var(--card-shadow);
    cursor: pointer;
}

.task-card:hover {
    border-color: var(--accent);
}

.task-card.is-completed {
    opacity: 0.6;
}

.checkbox-container {
    width: 22px;
    height: 22px;
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.task-card.is-completed .checkbox-container {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
}

.checkbox-check {
    font-size: 12px;
    display: none;
}

.task-card.is-completed .checkbox-check {
    display: block;
}

.task-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.task-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.task-card.is-completed .task-text {
    text-decoration: line-through;
    color: var(--text-muted);
}

.task-meta-pills {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
}

.pill-priority {
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
    text-transform: capitalize;
}

.pill-priority.high { background: rgba(248, 113, 113, 0.15); color: var(--high-color); }
.pill-priority.medium { background: rgba(250, 204, 21, 0.15); color: var(--medium-color); }
.pill-priority.low { background: rgba(74, 222, 128, 0.15); color: var(--low-color); }

.pill-due {
    color: var(--medium-color);
    font-weight: 500;
}

.pill-subtasks {
    color: var(--text-secondary);
}

.task-star-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.task-star-btn.active {
    color: var(--medium-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 70px 20px;
    color: var(--text-muted);
}

.empty-icon-box {
    margin-bottom: 12px;
    color: var(--text-muted);
}

.empty-state h3 {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 6px 0;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 14px;
    margin: 0;
    color: var(--text-secondary);
}

/* Slide-Over Task Detail Drawer */
.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 100;
}

.drawer-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.task-drawer {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--card-bg);
    box-shadow: var(--drawer-shadow);
    z-index: 101;
    display: flex;
    flex-direction: column;
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border-left: 1px solid var(--card-border);
}

.task-drawer.active {
    right: 0;
}

@media (max-width: 500px) {
    .task-drawer { width: 100vw; right: -100vw; }
    .taskflow-app { padding: 16px; }
    .stats-grid { grid-template-columns: 1fr; }
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--card-border);
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    color: var(--text-secondary);
    cursor: pointer;
}

.star-btn {
    background: transparent;
    border: none;
    font-size: 22px;
    color: var(--text-muted);
    cursor: pointer;
}

.star-btn.active {
    color: var(--medium-color);
}

.drawer-body {
    padding: 20px;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.drawer-title-input {
    width: 100%;
    font-size: 20px;
    font-weight: 700;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-primary);
    border-bottom: 2px solid transparent;
}

.drawer-title-input:focus {
    border-bottom-color: var(--accent);
}

.section-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 8px;
}

.subtask-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--input-bg);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 12px;
}

.subtask-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 10px;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
    border-bottom: 1px dashed var(--card-border);
}

.subtask-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--text-muted);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.subtask-item.is-completed .subtask-checkbox {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
}

.subtask-text {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
}

.subtask-item.is-completed .subtask-text {
    text-decoration: line-through;
    color: var(--text-muted);
}

.subtask-delete-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
}

.add-subtask-form {
    display: flex;
    align-items: center;
    gap: 8px;
}

.plus-icon-sm {
    color: var(--accent);
    font-weight: 600;
}

#subtaskInput {
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
    color: var(--text-primary);
    width: 100%;
}

.drawer-select, .drawer-date-input, .drawer-textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

.drawer-textarea {
    min-height: 100px;
    resize: vertical;
    font-family: inherit;
}

.drawer-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.created-date {
    font-size: 12px;
    color: var(--text-muted);
}

.drawer-delete-btn {
    background: transparent;
    border: 1px solid var(--high-color);
    color: var(--high-color);
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
}

.drawer-delete-btn:hover {
    background: var(--high-color);
    color: #ffffff;
}

/* Modal Overlay & Container */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 200;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -48%) scale(0.95);
    width: 90%;
    max-width: 480px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    z-index: 201;
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
    overflow: hidden;
}

.modal-container.active {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--card-border);
}

.modal-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
}

.modal-close-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    color: var(--text-muted);
    cursor: pointer;
}

.modal-body {
    padding: 24px;
    max-height: 75vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.modal-section-title {
    margin: 0 0 12px 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-section-title.danger {
    color: var(--high-color);
}

.info-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    padding: 6px 0;
    border-bottom: 1px dashed var(--card-border);
}

.info-label {
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    color: var(--text-primary);
    font-weight: 600;
}

.modal-btn {
    padding: 10px 16px;
    border-radius: 10px;
    border: none;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    width: 100%;
}

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

.modal-btn.primary:hover {
    background: var(--accent-hover);
}

.danger-zone {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 12px;
    padding: 16px;
}

.danger-desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0 0 14px 0;
    line-height: 1.4;
}

.modal-btn.danger {
    background: var(--high-color);
    color: #ffffff;
}

.modal-btn.danger:hover {
    background: #dc2626;
}