:root {
  --ink: #18323a;
  --muted: #65777d;
  --paper: #ffffff;
  --canvas: #f3f6f4;
  --line: #d9e2df;
  --brand: #0f5962;
  --brand-dark: #083f47;
  --accent: #d4a72c;
  --low: #2878c7;
  --medium: #b18400;
  --high: #d36812;
  --urgent: #c43131;
  --success: #23815a;
  --shadow: 0 12px 35px rgba(23, 54, 60, .09);
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--canvas); font: 15px/1.5 "Segoe UI", system-ui, sans-serif; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }

.hero { padding: 34px max(24px, calc((100vw - 1280px) / 2)); color: #fff; background: linear-gradient(125deg, #083f47, #0f6269 68%, #1a7375); display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.hero h1 { font-size: clamp(26px, 4vw, 42px); margin: 2px 0 4px; letter-spacing: -.035em; }
.subtitle { margin: 0; color: #d5e7e6; }
.eyebrow { margin: 0; color: #9bd0cc; font-weight: 800; font-size: 12px; letter-spacing: .14em; text-transform: uppercase; }
.today-chip { max-width: 230px; padding: 10px 14px; border: 1px solid rgba(255,255,255,.25); border-radius: 99px; background: rgba(255,255,255,.09); text-align: center; font-size: 13px; }

main { width: min(1280px, calc(100% - 32px)); margin: 0 auto 60px; }
.tabs { display: flex; gap: 4px; margin: 22px 0; padding: 5px; width: fit-content; background: #e3eae7; border-radius: 12px; }
.tab { border: 0; background: transparent; padding: 10px 20px; border-radius: 9px; cursor: pointer; font-weight: 700; }
.tab.active { background: var(--paper); color: var(--brand); box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.panel { display: none; }
.panel.active { display: block; }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat { padding: 18px 20px; border-radius: 14px; border-left: 4px solid var(--brand); background: var(--paper); box-shadow: var(--shadow); }
.stat span { display: block; color: var(--muted); font-size: 13px; }
.stat strong { display: block; margin-top: 2px; font-size: 30px; }
.stat.open { border-color: #829198; }.stat.progress { border-color: var(--accent); }.stat.done { border-color: var(--success); }
.completion-card { margin: 14px 0; padding: 18px 20px; background: var(--paper); border-radius: 14px; box-shadow: var(--shadow); }
.completion-card > div:first-child { display: flex; justify-content: space-between; font-weight: 700; }
.completion-card strong { color: var(--success); font-size: 20px; }
.completion-card small { color: var(--muted); }
.progress-track { height: 12px; margin: 10px 0 6px; overflow: hidden; background: #e8eeec; border-radius: 99px; }
.progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, #2e9670, #55b283); border-radius: inherit; transition: width .3s ease; }

.toolbar { display: grid; grid-template-columns: minmax(210px, 1.6fr) repeat(4, minmax(125px, 1fr)) auto; align-items: end; gap: 12px; margin: 22px 0 6px; padding: 16px; background: var(--paper); border-radius: 14px; box-shadow: var(--shadow); }
label > span, .toolbar label span { display: block; margin-bottom: 5px; color: var(--muted); font-size: 12px; font-weight: 700; }
input, select, textarea { width: 100%; border: 1px solid #cbd7d3; border-radius: 9px; padding: 10px 11px; color: var(--ink); background: #fff; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(15,89,98,.12); }
textarea { resize: vertical; }
button.primary, button.secondary, .icon-button { border-radius: 9px; padding: 10px 15px; border: 0; cursor: pointer; font-weight: 750; white-space: nowrap; }
button.primary { color: #fff; background: var(--brand); }
button.primary:hover { background: var(--brand-dark); }
button.secondary { color: var(--brand); background: #e5efed; }
button:disabled { opacity: .55; cursor: wait; }
.result-count { margin: 10px 2px; color: var(--muted); font-size: 13px; }

.task-list, .compact-list { display: grid; gap: 9px; }
.task-card { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; border: 1px solid var(--line); border-left: 5px solid #999; border-radius: 12px; background: var(--paper); text-align: left; cursor: pointer; box-shadow: 0 3px 14px rgba(23,54,60,.04); }
.task-card:hover { border-color: #a9c3bd; transform: translateY(-1px); }
.task-card.priority-low { border-left-color: var(--low); }.task-card.priority-medium { border-left-color: #e2b62f; }.task-card.priority-high { border-left-color: var(--high); }.task-card.priority-urgent { border-left-color: var(--urgent); }
.task-card.completed { opacity: .68; background: #edf4f0; }.task-card.completed strong { text-decoration: line-through; }
.task-card.overdue { box-shadow: inset 0 0 0 1px rgba(196,49,49,.35); }
.task-main { min-width: 0; }.task-main strong, .task-main small { display: block; }.task-main strong { font-size: 15px; }.task-main small { margin-top: 3px; color: var(--muted); }
.task-meta { display: flex; align-items: center; justify-content: end; flex-wrap: wrap; gap: 7px 10px; color: var(--muted); font-size: 12px; }
.badge, .legend span { padding: 3px 8px; border-radius: 99px; font-size: 11px; font-weight: 800; }
.p-low { color: #155795; background: #dcecff; }.p-medium { color: #6d5300; background: #fff1b8; }.p-high { color: #873b00; background: #ffe0c5; }.p-urgent { color: #8f1d1d; background: #ffdada; }
.status-open { color: #58666c; background: #e8ecee; }.status-in_progress { color: #755800; background: #fff1bd; }.status-done { color: #176343; background: #d9f1e5; }
.overdue-badge, .late-key { color: #fff; background: var(--urgent); }.done-key { color: #176343; background: #d9f1e5; text-decoration: line-through; }
.empty { padding: 28px; border: 1px dashed #bbc9c5; border-radius: 12px; color: var(--muted); background: rgba(255,255,255,.5); text-align: center; }

.calendar-toolbar, .section-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.calendar-toolbar h2, .section-heading h2, .section-heading h3 { margin: 0; text-transform: capitalize; }
.section-heading p { margin: 3px 0 0; color: var(--muted); }
.icon-button { min-width: 42px; margin-right: 5px; color: var(--brand); background: #e5efed; font-size: 20px; }
.legend { display: flex; justify-content: end; flex-wrap: wrap; gap: 7px; margin-bottom: 10px; }
.calendar-wrap { overflow-x: auto; border-radius: 14px; box-shadow: var(--shadow); }
.calendar { min-width: 820px; display: grid; grid-template-columns: repeat(7, 1fr); overflow: hidden; border: 1px solid var(--line); background: var(--line); gap: 1px; }
.weekday { padding: 9px; background: #e6edeb; color: var(--muted); text-align: center; font-size: 12px; font-weight: 800; }
.calendar-day { min-height: 128px; padding: 8px; border: 0; background: var(--paper); text-align: left; cursor: pointer; overflow: hidden; }
.calendar-day:hover { background: #f5faf8; }.calendar-day.outside { background: #f4f5f4; color: #a2aaa8; }.calendar-day.today { box-shadow: inset 0 0 0 2px var(--accent); }.calendar-day.selected { box-shadow: inset 0 0 0 3px var(--brand); }
.day-number { display: block; margin-bottom: 5px; font-weight: 800; }
.day-events { display: grid; gap: 4px; }
.calendar-event { display: block; overflow: hidden; padding: 3px 5px; border-radius: 5px; text-overflow: ellipsis; white-space: nowrap; font-size: 10px; }
.calendar-event.overdue { outline: 2px solid var(--urgent); }.calendar-event.completed { opacity: .55; text-decoration: line-through; }
.day-details, .undated-block { margin-top: 18px; padding: 18px; border-radius: 14px; background: var(--paper); box-shadow: var(--shadow); }
.day-details h3, .undated-block h3 { margin: 0 0 12px; }.day-details .section-heading h3 { margin: 0; }.compact-list .task-card { padding: 10px 12px; }
.muted { color: var(--muted); }

.user-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.user-card { display: flex; align-items: center; gap: 12px; padding: 15px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); text-align: left; cursor: pointer; }
.user-card.inactive { opacity: .6; }.user-card .avatar { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; color: #fff; background: var(--brand); font-weight: 800; }
.user-card strong, .user-card small { display: block; }.user-card small { color: var(--muted); }.edit-label { margin-left: auto; color: var(--brand); font-size: 12px; font-weight: 700; }
.warning { margin-top: 28px; padding: 18px 20px; border: 1px solid #edcd73; border-radius: 14px; background: #fff7d9; }.warning p { margin: 4px 0 0; }

dialog { width: min(700px, calc(100% - 24px)); max-height: calc(100vh - 32px); padding: 0; border: 0; border-radius: 16px; color: var(--ink); box-shadow: 0 26px 90px rgba(0,0,0,.28); }
dialog::backdrop { background: rgba(6,28,32,.6); backdrop-filter: blur(2px); }
dialog form { padding: 22px; }
.dialog-heading { display: flex; align-items: start; justify-content: space-between; margin-bottom: 18px; }.dialog-heading h2 { margin: 2px 0 0; }.close { border: 0; background: transparent; font-size: 28px; line-height: 1; cursor: pointer; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }.span-2 { grid-column: span 2; }
.toggle { display: flex; align-items: center; gap: 9px; margin-top: 15px; }.toggle input { width: auto; }.toggle span { margin: 0; }
.dialog-actions { display: flex; justify-content: end; gap: 8px; margin-top: 18px; }
.form-error { min-height: 22px; margin: 10px 0 0; color: var(--urgent); font-weight: 650; }
.history { margin-top: 15px; padding: 13px; border-radius: 10px; background: #f0f4f2; }.history h3 { margin: 0 0 8px; font-size: 14px; }.history div { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-top: 1px solid var(--line); font-size: 12px; }.history span { color: var(--muted); }
.flash { position: sticky; z-index: 10; top: 10px; margin: 12px 0; padding: 12px 16px; border-radius: 10px; color: #fff; background: var(--success); box-shadow: var(--shadow); }.flash.error { background: var(--urgent); }

@media (max-width: 900px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .toolbar { grid-template-columns: 1fr 1fr; }.search-field { grid-column: span 2; }
  .toolbar .primary { width: 100%; }
  .task-card { align-items: start; flex-direction: column; }.task-meta { justify-content: start; }
}

@media (max-width: 600px) {
  .hero { padding: 24px 18px; align-items: start; flex-direction: column; }.today-chip { text-align: left; }
  main { width: min(100% - 20px, 1280px); }.tabs { width: 100%; }.tab { flex: 1; padding: 9px 7px; }
  .stats-grid { gap: 8px; }.stat { padding: 14px; }.stat strong { font-size: 25px; }
  .toolbar { grid-template-columns: 1fr; }.search-field { grid-column: auto; }
  .calendar-toolbar { align-items: stretch; flex-direction: column; }.calendar-toolbar h2 { order: -1; }.calendar-toolbar > button { width: 100%; }
  .form-grid { grid-template-columns: 1fr; }.span-2 { grid-column: auto; }
  dialog form { padding: 18px; }.history div { flex-direction: column; gap: 2px; }
}