:root {
    --et-primary: #4F46E5;
    --et-primary-hover: #4338CA;
    --et-accent: #6366F1;
    --et-bg: #FAFAFA;
    --et-surface: #FFFFFF;
    --et-border: #E5E7EB;
    --et-text: #1F2937;
    --et-text-muted: #6B7280;
    --et-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --et-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.03);
    --et-radius: 10px;
    --et-radius-sm: 6px;
}

[data-bs-theme="dark"] {
    --et-primary: #818CF8;
    --et-primary-hover: #6366F1;
    --et-accent: #A5B4FC;
    --et-bg: #111827;
    --et-surface: #1F2937;
    --et-border: #374151;
    --et-text: #F9FAFB;
    --et-text-muted: #9CA3AF;
    --et-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --et-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.25);
}

* {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--et-bg);
    color: var(--et-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navbar */
.navbar {
    background-color: var(--et-surface);
    border-bottom: 1px solid var(--et-border);
    box-shadow: var(--et-shadow);
}

.navbar-brand {
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    color: var(--et-primary) !important;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--et-text-muted) !important;
    transition: color 0.15s;
}

.nav-link:hover {
    color: var(--et-text) !important;
}

/* Cards */
.card {
    border-radius: var(--et-radius);
    background-color: var(--et-surface);
    border: 1px solid var(--et-border);
    transition: box-shadow 0.15s, transform 0.15s;
}

.card.shadow-sm {
    box-shadow: var(--et-shadow);
}

/* Buttons */
.btn-primary {
    background-color: var(--et-primary);
    border-color: var(--et-primary);
    border-radius: var(--et-radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    transition: all 0.15s;
}

.btn-primary:hover {
    background-color: var(--et-primary-hover);
    border-color: var(--et-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-outline-secondary {
    border-radius: var(--et-radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    border-color: var(--et-border);
    color: var(--et-text-muted);
}

.btn-outline-secondary:hover {
    background-color: var(--et-border);
    border-color: var(--et-border);
    color: var(--et-text);
}

/* Form inputs */
.form-control,
.form-select {
    border-radius: var(--et-radius-sm);
    border-color: var(--et-border);
    font-size: 0.9rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--et-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Task items */
.task-item {
    transition: all 0.2s;
    cursor: default;
}

.task-item:hover {
    box-shadow: var(--et-shadow-md);
}

.task-item.task-completed {
    opacity: 0.6;
}

.task-item .task-actions {
    opacity: 0;
    transition: opacity 0.15s;
}

.task-item:hover .task-actions {
    opacity: 1;
}

.task-title {
    font-size: 0.9rem;
    font-weight: 450;
    line-height: 1.4;
}

.task-description {
    font-size: 0.8rem;
    line-height: 1.3;
}

.drag-handle {
    cursor: grab;
    color: var(--et-text-muted);
    font-size: 1rem;
    opacity: 0.4;
    transition: opacity 0.15s;
    user-select: none;
}

.task-item:hover .drag-handle {
    opacity: 1;
}

.drag-handle:active {
    cursor: grabbing;
}

/* Sortable styles */
.sortable-ghost {
    opacity: 0.4;
    background-color: var(--et-primary);
    border-radius: var(--et-radius);
}

.sortable-drag {
    box-shadow: var(--et-shadow-md);
}

/* Checkbox */
.form-check-input {
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 4px;
    border: 2px solid var(--et-border);
    cursor: pointer;
    transition: all 0.15s;
}

.form-check-input:checked {
    background-color: var(--et-primary);
    border-color: var(--et-primary);
}

/* Projects */
.project-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

/* Colored project select */
.custom-project-select {
    position: relative;
    min-width: 140px;
}

.custom-select-trigger {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border: 1px solid var(--et-border);
    border-radius: var(--et-radius-sm);
    background: var(--et-surface);
    cursor: pointer;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: border-color 0.15s;
    width: 100%;
}

.custom-select-trigger:hover {
    border-color: var(--et-primary);
}

.custom-select-trigger .custom-select-label {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.custom-select-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--et-surface);
    border: 1px solid var(--et-border);
    border-radius: var(--et-radius-sm);
    box-shadow: var(--et-shadow-md);
    z-index: 1050;
    max-height: 200px;
    overflow-y: auto;
}

.custom-project-select.open .custom-select-dropdown {
    display: block;
}

.custom-select-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background-color 0.1s;
}

.custom-select-option:hover {
    background-color: var(--et-border);
}

.custom-select-option.selected {
    background-color: rgba(79, 70, 229, 0.08);
    font-weight: 500;
}

.project-select-wrapper {
    position: relative;
    max-width: 160px;
}

.project-select-colored {
    padding-left: 24px !important;
    font-size: 0.85rem !important;
}

.project-select-wrapper::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--project-select-color, #9CA3AF);
    pointer-events: none;
    z-index: 1;
}

/* Project filter sidebar */
.filter-item {
    color: var(--et-text);
    transition: background-color 0.15s;
    font-weight: 400;
}

.filter-item:hover {
    background-color: var(--et-border);
    color: var(--et-text);
}

.filter-item.active {
    background-color: var(--et-primary);
    color: white;
}

.filter-item.active .project-color-dot {
    box-shadow: 0 0 0 2px white;
}

/* Calendar */
.calendar-table {
    border-collapse: collapse;
    table-layout: fixed;
}

.calendar-table th {
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.calendar-day {
    padding: 2px;
    vertical-align: top;
}

.calendar-day-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--et-text);
    border-radius: 6px;
    padding: 3px 2px;
    min-height: 38px;
    transition: background-color 0.15s;
}

.calendar-day-link:hover {
    background-color: var(--et-border);
    color: var(--et-text);
}

.calendar-day.active .calendar-day-link {
    background-color: var(--et-primary);
    color: white;
}

.calendar-day.today .calendar-day-link {
    border: 2px solid var(--et-primary);
}

.calendar-day.active.today .calendar-day-link {
    border-color: transparent;
}

.day-number {
    font-size: 0.8rem;
    font-weight: 500;
    line-height: 1;
}

.day-count {
    font-size: 0.6rem;
    color: var(--et-text-muted);
    line-height: 1;
    margin-top: 1px;
}

.calendar-day.active .day-count {
    color: rgba(255, 255, 255, 0.8);
}

/* Landing */
.landing-hero {
    padding: 4rem 0;
}

.min-vh-75 {
    min-height: 65vh;
}

.landing-illustration {
    padding: 2rem;
}

.mock-task-list {
    background: var(--et-surface);
    border-radius: var(--et-radius);
    padding: 1.5rem;
    box-shadow: var(--et-shadow-md);
    border: 1px solid var(--et-border);
}

.mock-task {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--et-border);
}

.mock-task:last-child {
    border-bottom: none;
}

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

.mock-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--et-border);
    border-radius: 4px;
    flex-shrink: 0;
}

.mock-checkbox.checked {
    background-color: var(--et-primary);
    border-color: var(--et-primary);
    position: relative;
}

.mock-checkbox.checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 1px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.mock-text {
    font-size: 0.9rem;
    color: var(--et-text);
}

.feature-card {
    border-radius: var(--et-radius);
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-2px);
}

.feature-icon {
    color: var(--et-primary);
}

/* Badge overrides */
.badge {
    font-weight: 500;
    border-radius: 4px;
    letter-spacing: 0;
}

/* Alert */
.alert {
    border-radius: var(--et-radius-sm);
    font-size: 0.9rem;
}

/* Carry Over Button */
.carry-over-btn {
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    border-radius: var(--et-radius);
    background: linear-gradient(135deg, var(--et-primary), var(--et-accent));
    border: none;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
    transition: all 0.2s;
}

.carry-over-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

/* Modal */
.modal-content {
    border-radius: var(--et-radius);
    border: none;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .landing-hero {
        padding: 2rem 0;
        text-align: center;
    }

    .landing-hero .btn {
        display: block;
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .landing-hero .btn + .btn {
        margin-left: 0 !important;
    }

    .task-item .task-actions {
        opacity: 1;
    }

    .navbar-brand {
        font-size: 1.1rem;
    }

    h1.display-4 {
        font-size: 2rem;
    }

    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

@media (max-width: 576px) {
    #add-task-form {
        flex-wrap: wrap;
    }

    #add-task-form .form-control {
        flex: 1 1 100%;
    }

    #add-task-form .form-select {
        max-width: none !important;
        flex: 1 1 70%;
    }

    .task-item .card-body {
        padding: 0.5rem !important;
    }
}

/* Scrollbar (Webkit) */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--et-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--et-text-muted);
}