:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --panel-border: #d8dee8;
    --panel-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
    --text: #17202f;
    --text-soft: #667085;
    --heading: #0f172a;
    --accent: #2563eb;
    --accent-soft: #dbeafe;
    --accent-muted: #eff6ff;
    --done: #15803d;
    --done-soft: #e7f8ec;
    --danger: #dc2626;
    --danger-soft: #feeceb;
    --high: #fee2e2;
    --medium: #fef3c7;
    --low: #dcfce7;
    --control-bg: #fbfcfe;
}

* {
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
}

body.modal-open {
    overflow: hidden;
}

button,
input,
textarea,
select {
    font: inherit;
}

button,
input,
textarea,
select {
    border: 1px solid var(--panel-border);
    border-radius: 10px;
}

button {
    background: var(--panel);
    color: var(--text);
    cursor: pointer;
    transition: transform 0.16s ease, background-color 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

button:hover {
    background: #f8fafc;
}

button:disabled {
    cursor: not-allowed;
}

input,
textarea,
select {
    width: 100%;
    padding: 0.85rem 0.95rem;
    background: var(--control-bg);
    color: var(--text);
}

textarea {
    resize: vertical;
    min-height: 110px;
}

input:focus,
textarea:focus,
select:focus {
    outline: 2px solid transparent;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.mdi {
    line-height: 1;
}

.app {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    padding: 1.75rem 1.5rem;
    background: var(--panel);
    border-right: 1px solid var(--panel-border);
}

.sidebar h1,
.main-header h2,
.modal-header h3 {
    margin: 0;
    color: var(--heading);
}

.sidebar h1 {
    font-size: 2.1rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.project-form {
    display: grid;
    gap: 0.75rem;
    margin: 1.4rem 0 0.75rem;
}

.project-form input::placeholder {
    color: #97a0af;
}

.form-message {
    min-height: 1.25rem;
    margin: 0 0 0.75rem;
    color: var(--danger);
    font-size: 0.9rem;
}

.project-list {
    display: grid;
    gap: 0.5rem;
}

.project-row {
    display: block;
}

.section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.section-heading h2 {
    margin: 0;
    color: var(--text-soft);
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.project-select-btn {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: center;
    gap: 0.4rem;
    width: 100%;
    padding: 0.72rem 0.78rem;
    text-align: left;
    background: var(--control-bg);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.project-select-btn:hover {
    background: #f2f6ff;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.project-select-btn.active {
    border-color: var(--accent);
    background: var(--accent-muted);
    box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.12);
}

.project-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 600;
}

.project-label {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-width: 0;
}

.project-label .mdi {
    color: var(--text-soft);
    font-size: 0.95rem;
}

.project-count {
    color: var(--text-soft);
    font-size: 0.84rem;
    font-weight: 600;
}

.project-action-group {
    display: flex;
    gap: 0.3rem;
    justify-content: flex-end;
}

.icon-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    padding: 0;
    background: var(--control-bg);
    color: var(--text-soft);
}

.icon-action-btn .mdi,
.close-btn .mdi {
    font-size: 1.02rem;
}

.icon-action-btn:hover {
    background: #eef3fb;
    border-color: #c7d2e1;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.05);
}

.icon-action-btn:disabled {
    color: #a8b0bf;
    background: #f4f6fa;
    border-color: #dde3ec;
    box-shadow: none;
}

.icon-action-btn:disabled:hover {
    background: #f4f6fa;
    border-color: #dde3ec;
    box-shadow: none;
}

.project-edit-btn:hover,
.todo-edit-btn:hover {
    color: var(--accent);
    background: var(--accent-muted);
}

.project-delete-btn:hover,
.todo-delete-btn:hover {
    color: var(--danger);
    background: var(--danger-soft);
}

.main {
    padding: 1.75rem;
}

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.main-header h2 {
    font-size: 1.95rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.subtle-text {
    margin: 0.35rem 0 0;
    color: var(--text-soft);
    line-height: 1.5;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.toolbar label {
    font-weight: 600;
}

.toolbar select {
    width: auto;
    min-width: 150px;
    padding-right: 2.25rem;
}

.primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.18);
    border-radius: 8px;
    padding: 0.7rem 1rem;
}

.primary-btn .mdi,
.form-btn .mdi {
    font-size: 1.05rem;
}

.primary-btn:hover {
    background: #2563eb;
    border-color: #2563eb;
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.24);
}

.empty-state {
    padding: 1.25rem;
    border: 1px dashed var(--panel-border);
    border-radius: 14px;
    background: var(--panel);
    box-shadow: var(--panel-shadow);
}

.empty-state p {
    margin: 0;
    color: var(--text-soft);
}

.todo-list {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.todo-card {
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    background: var(--panel);
    overflow: hidden;
    box-shadow: var(--panel-shadow);
}

.todo-card:hover {
    background: #fbfcff;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.09);
}

.todo-card summary {
    list-style: none;
    cursor: pointer;
}

.todo-card summary::-webkit-details-marker {
    display: none;
}

.todo-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.1rem 0.95rem;
}

.todo-summary-left {
    min-width: 0;
}

.todo-title-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.todo-title {
    margin: 0 0 0.25rem;
    font-size: 1.05rem;
    font-weight: 700;
}

.todo-summary.is-complete .todo-title {
    text-decoration: line-through;
    color: var(--text-soft);
}

.todo-date {
    margin: 0;
    color: var(--text-soft);
    font-size: 0.92rem;
}

.todo-summary-right {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.todo-action-group {
    display: flex;
    gap: 0.45rem;
}

.priority-pill,
.status-pill {
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 700;
}

.priority-pill.high {
    background: var(--high);
}

.priority-pill.medium {
    background: var(--medium);
}

.priority-pill.low {
    background: var(--low);
}

.status-pill {
    background: var(--done-soft);
    color: var(--done);
}

.todo-body {
    padding: 0 1.1rem 1rem;
    border-top: 1px solid var(--panel-border);
}

.todo-meta-grid {
    display: grid;
    gap: 0.55rem;
    margin: 1rem 0 0.9rem;
}

.todo-meta-item {
    display: flex;
    gap: 0.45rem;
    flex-wrap: wrap;
    margin: 0;
    color: var(--text-soft);
}

.todo-meta-label {
    color: var(--heading);
    font-weight: 700;
}

.todo-description {
    margin: 0;
    color: var(--text-soft);
    line-height: 1.5;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.todo-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    padding-top: 0.2rem;
}

.soft-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.65rem 0.85rem;
    font-weight: 600;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.45);
}

.modal-backdrop.is-hidden {
    display: none;
}

.modal-card {
    width: min(520px, 100%);
    padding: 1.25rem;
    border-radius: 18px;
    background: var(--panel);
    box-shadow: 0 28px 60px rgba(15, 23, 42, 0.2);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.close-btn {
    width: 2.45rem;
    height: 2.45rem;
    padding: 0;
}

.todo-form {
    display: grid;
    gap: 0.8rem;
}

.todo-form label {
    color: var(--heading);
    font-size: 0.95rem;
    font-weight: 700;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.confirm-card {
    width: min(430px, 100%);
}

.confirm-message {
    margin: 0;
    color: var(--text-soft);
    line-height: 1.6;
}

.danger-solid-btn {
    background: var(--danger);
    border-color: var(--danger);
    color: #ffffff;
    font-weight: 700;
    border-radius: 8px;
    padding: 0.7rem 1rem;
}

.danger-solid-btn:hover {
    background: #b91c1c;
    border-color: #b91c1c;
}

.form-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    font-weight: 700;
    border-radius: 8px;
    padding: 0.7rem 1rem;
}

.form-btn:hover {
    background: #f3f7fd;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

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

@media (max-width: 860px) {
    .app {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--panel-border);
    }

    .main {
        padding: 1.25rem;
    }

    .main-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 560px) {
    .toolbar,
    .form-row,
    .todo-summary,
    .modal-actions {
        grid-template-columns: 1fr;
        display: grid;
    }

    .section-heading {
        margin-bottom: 0.5rem;
    }

    .toolbar select,
    .toolbar button,
    .modal-actions button {
        width: 100%;
    }

    .todo-summary-right {
        justify-content: flex-start;
    }

    .todo-action-group,
    .project-action-group {
        justify-content: flex-start;
    }
}