:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #f0f2f8;
  --text: #182033;
  --muted: #687086;
  --border: #e2e6ef;
  --primary: #5b5bd6;
  --primary-hover: #4c4cc2;
  --primary-soft: #ededff;
  --danger: #dc4c64;
  --success: #249b6b;
  --warning: #d08a27;
  --shadow: 0 12px 35px rgba(31, 38, 65, .08);
  --radius: 18px;
  --sidebar: 280px;
}

[data-theme="dark"] {
  --bg: #10131b;
  --surface: #181c27;
  --surface-2: #222735;
  --text: #f3f5fb;
  --muted: #a6aec2;
  --border: #2d3342;
  --primary: #8b8cf1;
  --primary-hover: #a0a1ff;
  --primary-soft: #29294c;
  --shadow: 0 14px 36px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--bg); color: var(--text); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.5; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible, a:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 45%, transparent); outline-offset: 2px; }
.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; }
.skip-link { position: fixed; z-index: 9999; top: 8px; left: 8px; transform: translateY(-150%); background: var(--text); color: var(--surface); padding: 10px 14px; border-radius: 10px; }
.skip-link:focus { transform: translateY(0); }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: var(--sidebar) 1fr; }
.sidebar { position: sticky; top: 0; height: 100vh; padding: 24px 18px; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; gap: 24px; z-index: 30; }
.brand { display: flex; align-items: center; gap: 12px; padding: 0 6px; }
.brand__mark { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; background: linear-gradient(135deg, var(--primary), #8d66e5); box-shadow: 0 10px 22px color-mix(in srgb, var(--primary) 28%, transparent); }
.brand__mark svg { width: 25px; fill: none; stroke: #fff; stroke-width: 2.3; stroke-linecap: round; stroke-linejoin: round; }
.brand strong, .brand span { display: block; }
.brand strong { font-size: 1.15rem; }
.brand div > span { color: var(--muted); font-size: .72rem; }
.btn { border: 0; border-radius: 12px; padding: 11px 16px; font-weight: 750; transition: .2s ease; }
.btn:hover { transform: translateY(-1px); }
.btn--full { width: 100%; }
.btn--primary { background: var(--primary); color: #fff; box-shadow: 0 8px 18px color-mix(in srgb, var(--primary) 25%, transparent); }
.btn--primary:hover { background: var(--primary-hover); }
.btn--ghost { background: var(--surface-2); color: var(--text); }
.btn--danger { background: var(--danger); color: #fff; }
.nav-list, .category-list { display: grid; gap: 7px; }
.nav-item, .category-item { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 10px; border: 0; padding: 10px 12px; border-radius: 11px; color: var(--muted); background: transparent; text-align: left; }
.nav-item:hover, .category-item:hover, .nav-item.is-active, .category-item.is-active { background: var(--primary-soft); color: var(--primary); }
.nav-item strong, .category-item strong { font-size: .78rem; min-width: 26px; padding: 2px 7px; text-align: center; border-radius: 999px; background: var(--surface-2); }
.category-item__name { display: flex; align-items: center; gap: 9px; min-width: 0; }
.category-item__dot { width: 9px; height: 9px; border-radius: 50%; flex: 0 0 auto; }
.category-item__name span:last-child { overflow: hidden; text-overflow: ellipsis; }
.sidebar-section { min-height: 0; }
.sidebar-section__header { display: flex; align-items: center; justify-content: space-between; padding: 0 7px 8px; }
.sidebar-section h2 { margin: 0; font-size: .73rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.sidebar-footer { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); }
.theme-toggle { width: 100%; border: 0; background: var(--surface-2); color: var(--text); border-radius: 11px; padding: 10px 12px; display: flex; align-items: center; gap: 10px; }
.icon-btn { width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 12px; display: grid; place-items: center; background: var(--surface); color: var(--text); transition: .2s ease; }
.icon-btn:hover { border-color: var(--primary); color: var(--primary); }
.icon-btn--small { width: 30px; height: 30px; border-radius: 9px; }

.main-area { min-width: 0; }
.topbar { min-height: 98px; position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 18px clamp(20px, 4vw, 48px); background: color-mix(in srgb, var(--bg) 88%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent); backdrop-filter: blur(12px); }
.topbar__title p { margin: 0 0 3px; color: var(--muted); font-size: .82rem; text-transform: capitalize; }
.topbar__title h1 { margin: 0; font-size: clamp(1.35rem, 2.5vw, 1.75rem); }
.topbar__actions { display: flex; gap: 10px; align-items: center; }
.search-box { width: min(330px, 32vw); min-width: 200px; height: 43px; display: flex; align-items: center; gap: 8px; padding: 0 13px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--muted); }
.search-box:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 15%, transparent); }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--text); }
.content { max-width: 1450px; margin: 0 auto; padding: 30px clamp(18px, 4vw, 48px) 60px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat-card { display: flex; align-items: center; gap: 14px; min-height: 105px; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.stat-card__icon { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 14px; background: var(--surface-2); font-size: 1.2rem; }
.stat-card strong, .stat-card span { display: block; }
.stat-card strong { font-size: 1.55rem; }
.stat-card div span { color: var(--muted); font-size: .82rem; }
.toolbar { margin: 22px 0; display: flex; align-items: end; justify-content: space-between; gap: 16px; padding: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; }
.toolbar__group { display: flex; gap: 12px; flex-wrap: wrap; }
.toolbar label { color: var(--muted); font-size: .73rem; font-weight: 700; }
.toolbar select { min-width: 135px; display: block; margin-top: 5px; border: 1px solid var(--border); border-radius: 10px; padding: 8px 30px 8px 10px; background: var(--surface-2); color: var(--text); }
.task-section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.task-section__header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 24px; border-bottom: 1px solid var(--border); }
.task-section__header h2 { margin: 0; font-size: 1.1rem; }
.task-section__header p { margin: 2px 0 0; color: var(--muted); font-size: .78rem; }
.drag-hint { padding: 6px 10px; border-radius: 999px; background: var(--surface-2); }
.task-list { min-height: 80px; }
.task-card { position: relative; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 15px; padding: 17px 22px; border-bottom: 1px solid var(--border); transition: background .2s, opacity .2s, transform .2s; }
.task-card:last-child { border-bottom: 0; }
.task-card:hover { background: color-mix(in srgb, var(--primary-soft) 40%, transparent); }
.task-card.dragging { opacity: .45; transform: scale(.99); }
.task-card.drag-over { box-shadow: inset 0 3px 0 var(--primary); }
.task-card.is-completed .task-card__title { text-decoration: line-through; color: var(--muted); }
.task-card.is-completed .task-card__description { opacity: .65; }
.task-card__check { width: 23px; height: 23px; accent-color: var(--primary); }
.task-card__body { min-width: 0; }
.task-card__title-row { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.task-card__title { margin: 0; font-size: .98rem; overflow-wrap: anywhere; }
.task-card__description { margin: 5px 0 8px; color: var(--muted); font-size: .82rem; white-space: pre-line; overflow-wrap: anywhere; }
.task-card__meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; color: var(--muted); font-size: .73rem; }
.badge { display: inline-flex; align-items: center; gap: 5px; padding: 4px 8px; border-radius: 999px; font-weight: 700; }
.badge--priority-high { background: color-mix(in srgb, var(--danger) 13%, transparent); color: var(--danger); }
.badge--priority-medium { background: color-mix(in srgb, var(--warning) 14%, transparent); color: var(--warning); }
.badge--priority-low { background: color-mix(in srgb, var(--success) 13%, transparent); color: var(--success); }
.badge--overdue { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); }
.task-card__actions { display: flex; gap: 6px; opacity: .4; transition: opacity .2s; }
.task-card:hover .task-card__actions, .task-card:focus-within .task-card__actions { opacity: 1; }
.task-card__actions button { width: 34px; height: 34px; border: 0; border-radius: 9px; background: var(--surface-2); color: var(--muted); }
.task-card__actions button:hover { color: var(--primary); }
.task-card__actions .delete:hover { color: var(--danger); }
.empty-state { text-align: center; padding: 65px 20px; }
.empty-state > div { font-size: 3rem; }
.empty-state h2 { margin: 12px 0 5px; }
.empty-state p { margin: 0 0 18px; color: var(--muted); }

.modal[hidden] { display: none; }
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 18px; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(8, 10, 18, .62); backdrop-filter: blur(4px); }
.modal__panel { position: relative; width: min(560px, 100%); max-height: calc(100vh - 36px); overflow: auto; padding: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: 22px; box-shadow: 0 24px 70px rgba(0,0,0,.28); animation: modalIn .2s ease; }
.modal__panel--small { width: min(430px, 100%); }
@keyframes modalIn { from { opacity: 0; transform: translateY(12px) scale(.98); } }
.modal__header { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 20px; }
.modal__header p { margin: 0; color: var(--primary); font-size: .72rem; text-transform: uppercase; font-weight: 800; letter-spacing: .1em; }
.modal__header h2 { margin: 3px 0 0; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: .82rem; font-weight: 750; }
.form-group input, .form-group textarea, .form-group select { width: 100%; border: 1px solid var(--border); border-radius: 11px; padding: 11px 12px; background: var(--surface-2); color: var(--text); }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-meta { display: flex; justify-content: space-between; margin-top: 4px; color: var(--muted); font-size: .7rem; }
.field-error { display: block; min-height: 17px; color: var(--danger); font-size: .72rem; margin-top: 4px; }
.modal__actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }
.confirm-icon { width: 58px; height: 58px; display: grid; place-items: center; margin: 0 auto 14px; border-radius: 18px; background: color-mix(in srgb, var(--danger) 13%, transparent); font-size: 1.6rem; }
#confirmModal .modal__panel { text-align: center; }
#confirmModal .modal__panel p { color: var(--muted); }
#confirmModal .modal__actions { justify-content: center; }
.toast-container { position: fixed; z-index: 200; right: 20px; bottom: 20px; display: grid; gap: 10px; }
.toast { min-width: 240px; max-width: 360px; padding: 12px 14px; border-radius: 12px; background: var(--text); color: var(--surface); box-shadow: var(--shadow); animation: toastIn .25s ease; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } }

.site-footer { max-width: 1450px; width: 100%; margin: 0 auto; padding: 26px clamp(18px, 4vw, 48px) 34px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); }
.site-footer__brand strong, .site-footer__brand span { display: block; }
.site-footer__brand strong { color: var(--text); font-size: 1rem; letter-spacing: -.01em; }
.site-footer__brand span { margin-top: 2px; font-size: .76rem; }
.site-footer__author { display: flex; align-items: center; gap: 16px; font-size: .78rem; font-weight: 650; }
.site-footer__links { display: flex; align-items: center; gap: 8px; }
.site-footer__links a { display: inline-flex; align-items: center; gap: 7px; min-height: 36px; padding: 8px 11px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--text); text-decoration: none; transition: .2s ease; }
.site-footer__links a:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.site-footer__links svg { width: 16px; height: 16px; fill: currentColor; flex: 0 0 auto; }

.mobile-only { display: none; }

@media (max-width: 1050px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .toolbar { align-items: stretch; flex-direction: column; }
  .toolbar > label select { width: 100%; }
}
@media (max-width: 800px) {
  .app-shell { display: block; }
  .sidebar { position: fixed; left: 0; transform: translateX(-105%); width: min(300px, 86vw); box-shadow: 18px 0 45px rgba(0,0,0,.2); transition: transform .25s ease; }
  .sidebar.is-open { transform: translateX(0); }
  .mobile-only { display: grid; }
  .topbar { padding: 14px 18px; min-height: 82px; }
  .topbar__title p { display: none; }
  .topbar__actions { flex: 1; justify-content: flex-end; }
  .search-box { width: min(260px, 50vw); min-width: 0; }
  .content { padding-top: 22px; }
}
@media (max-width: 600px) {
  .stats-grid { gap: 10px; }
  .stat-card { min-height: 88px; padding: 14px; }
  .stat-card__icon { width: 40px; height: 40px; }
  .toolbar__group { display: grid; grid-template-columns: 1fr 1fr; }
  .toolbar__group label:last-child { grid-column: 1 / -1; }
  .toolbar select { width: 100%; min-width: 0; }
  .task-section__header { align-items: flex-start; padding: 18px; }
  .drag-hint { display: none; }
  .task-card { grid-template-columns: auto 1fr; padding: 16px; align-items: start; }
  .task-card__actions { grid-column: 2; opacity: 1; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .topbar__title { display: none; }
  .search-box { width: 100%; }
  .modal__panel { padding: 20px; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 14px; padding-bottom: 26px; }
  .site-footer__author { width: 100%; align-items: flex-start; flex-direction: column; gap: 10px; }
  .site-footer__links { width: 100%; }
  .site-footer__links a { flex: 1; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}