:root {
  --bg: #0b0f14;
  --bg-side: #0e141b;
  --bg-card: #131a22;
  --bg-card-hover: #18212c;
  --blue: #3fb6ff;
  --orange: #ffb42a;
  --red: #ff5a5a;
  --text: #e8edf2;
  --muted: #8b98a5;
  --line: rgba(255,255,255,.07);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--text);
  -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea {
  font-family: inherit; font-size: 1rem; color: var(--text);
  background: var(--bg-card); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--blue); border-color: transparent; }

/* ---------- Auth ---------- */
.auth-screen { min-height: 100dvh; display: grid; place-items: center; padding: 24px; }
.auth-card { width: 100%; max-width: 380px; text-align: center; }
.auth-logo { width: 72px; height: 72px; border-radius: 18px; margin-bottom: 18px; }
.auth-card h1 { font-size: 1.8rem; font-weight: 800; }
.auth-card h1 span { color: var(--blue); text-shadow: 0 0 18px rgba(63,182,255,.5); }
.auth-sub { color: var(--orange); font-weight: 700; letter-spacing: .12em; font-size: .8rem; text-transform: uppercase; margin: 6px 0 26px; }
.auth-card form { display: grid; gap: 12px; }
.btn-blue {
  background: var(--blue); color: #06121c; border: none; border-radius: 10px;
  padding: 12px 20px; font-weight: 700; font-size: 1rem;
  box-shadow: 0 0 20px rgba(63,182,255,.3);
}
.auth-toggle { margin-top: 18px; color: var(--muted); font-size: .9rem; }
.auth-toggle a { color: var(--blue); }
.auth-error { margin-top: 12px; color: var(--red); font-size: .9rem; min-height: 1.2em; }

/* ---------- Layout ---------- */
.app { display: grid; grid-template-columns: 260px 1fr; grid-template-rows: 56px 1fr; height: 100dvh; }
.topbar {
  grid-column: 1 / -1; display: flex; align-items: center; gap: 12px; padding: 0 14px;
  border-bottom: 1px solid var(--line); background: rgba(11,15,20,.9); backdrop-filter: blur(10px);
  padding-top: env(safe-area-inset-top);
  height: calc(56px + env(safe-area-inset-top));
}
.topbar-title { font-weight: 800; font-size: 1.05rem; flex: 1; }
.icon-btn {
  background: none; border: none; color: var(--muted); font-size: 1.2rem;
  width: 40px; height: 40px; border-radius: 10px;
}
.icon-btn:hover { background: var(--bg-card); color: var(--text); }
.icon-btn.danger:hover { color: var(--red); }
#menu-btn { display: none; }

.sidebar {
  background: var(--bg-side); border-right: 1px solid var(--line);
  padding: 14px; overflow-y: auto;
}
.nav-list { display: grid; gap: 2px; }
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 10px;
  color: var(--text); text-decoration: none; font-size: .95rem; cursor: pointer;
}
.nav-item:hover { background: var(--bg-card); }
.nav-item.active { background: rgba(63,182,255,.12); color: var(--blue); font-weight: 700; }
.nav-ico { width: 20px; text-align: center; }
.count { margin-left: auto; color: var(--muted); font-size: .8rem; }
.side-section { margin-top: 22px; }
.side-head {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--muted); font-size: .75rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .12em; margin-bottom: 8px; padding: 0 10px;
}
.mini-btn {
  background: var(--bg-card); border: 1px solid var(--line); color: var(--blue);
  border-radius: 8px; width: 24px; height: 24px; font-size: 1rem; line-height: 1;
}
.proj-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 10px; }
.tag-chip {
  background: var(--bg-card); border: 1px solid var(--line); color: var(--muted);
  border-radius: 999px; padding: 4px 12px; font-size: .8rem; cursor: pointer;
}
.tag-chip.active { border-color: var(--orange); color: var(--orange); }

/* ---------- Main ---------- */
.main { overflow-y: auto; padding: 20px 22px 80px; }
.quick-add-wrap { max-width: 760px; margin: 0 auto 18px; }
#quick-add {
  font-size: 1.05rem; padding: 14px 16px; border-radius: 14px;
  border: 1.5px solid rgba(63,182,255,.35); background: var(--bg-card);
  box-shadow: 0 0 24px rgba(63,182,255,.08);
}
.qa-hint { color: #55626e; font-size: .75rem; margin: 6px 4px 0; }

.filter-bar { max-width: 760px; margin: 0 auto 16px; display: grid; grid-template-columns: 1fr auto auto auto; gap: 8px; }
.filter-bar input, .filter-bar select { padding: 9px 12px; font-size: .88rem; border-radius: 10px; }
.filter-bar select { width: auto; color: var(--muted); }
.filter-bar select.active { color: var(--orange); border-color: rgba(255,180,42,.5); }
@media (max-width: 760px) {
  .filter-bar { grid-template-columns: 1fr 1fr 1fr; }
  .filter-bar input { grid-column: 1 / -1; }
}

.task-list { max-width: 760px; margin: 0 auto; display: grid; gap: 8px; }
.group-head {
  color: var(--muted); font-size: .78rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .12em; margin: 14px 4px 2px;
}
.group-head.overdue { color: var(--red); }
.task {
  display: flex; align-items: flex-start; gap: 12px; padding: 12px 14px;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px;
  cursor: pointer; transition: background .12s ease;
  touch-action: pan-y; position: relative;
}
.task.drag { opacity: .45; }
.task.reordering {
  outline: 2px solid var(--blue); box-shadow: 0 14px 36px rgba(0,0,0,.65), 0 0 24px rgba(63,182,255,.35);
  transform: scale(1.045) rotate(1.8deg); z-index: 5; background: var(--bg-card-hover);
  transition: transform .15s ease, box-shadow .15s ease;
}
.nav-item.drop-target { outline: 2px dashed var(--blue); background: rgba(63,182,255,.12); }
.handle {
  background: none; border: none; color: #4a5661; font-size: 1.15rem;
  padding: 10px 12px; margin: -10px -12px 0 0; cursor: grab; touch-action: none; flex-shrink: 0;
}
.handle:active { cursor: grabbing; color: var(--blue); }
.task:hover { background: var(--bg-card-hover); }
.task.done .t-title { text-decoration: line-through; color: var(--muted); }
.checkbox {
  width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--muted);
  background: none; flex-shrink: 0; margin-top: 1px; font-size: 0.8rem; color: transparent;
}
.checkbox:hover { border-color: var(--blue); }
.task.done .checkbox, .checkbox.checked { background: var(--blue); border-color: var(--blue); color: #06121c; }
.task.p1 .checkbox { border-color: var(--red); }
.task.p2 .checkbox { border-color: var(--orange); }
.task.p3 .checkbox { border-color: var(--blue); }
.t-body { flex: 1; min-width: 0; }
.t-title { font-size: .98rem; line-height: 1.4; overflow-wrap: anywhere; }
.t-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; font-size: .75rem; color: var(--muted); align-items: center; }
.t-meta .due.overdue { color: var(--red); font-weight: 700; }
.t-meta .due.today { color: var(--orange); font-weight: 700; }
.t-meta .proj { display: inline-flex; align-items: center; gap: 5px; }
.t-meta .tag { color: var(--orange); }
.t-meta .subcount { color: var(--muted); }
.t-meta .recur::before { content: "🔁 "; font-size: .7rem; }

.empty-state { text-align: center; margin-top: 60px; color: var(--muted); }
.empty-emoji { font-size: 3rem; margin-bottom: 10px; }

/* ---------- Detail drawer ---------- */
.detail {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(420px, 100vw);
  background: var(--bg-side); border-left: 1px solid var(--line); z-index: 40;
  padding: 16px 18px calc(24px + env(safe-area-inset-bottom)); overflow-y: auto;
  box-shadow: -20px 0 60px rgba(0,0,0,.5);
}
.detail-head { display: flex; justify-content: space-between; margin-bottom: 10px; }
.d-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 14px; }
.d-row { display: grid; grid-template-columns: 90px 1fr; align-items: center; gap: 10px; margin-bottom: 12px; }
.d-col { margin-bottom: 14px; }
.d-row label, .d-col label { color: var(--muted); font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
.d-col label { display: block; margin-bottom: 8px; }
.prio-row { display: flex; gap: 8px; }
.prio {
  flex: 1; padding: 8px 0; border-radius: 8px; background: var(--bg-card);
  border: 1.5px solid var(--line); color: var(--muted); font-weight: 700;
}
.prio.p1.sel { border-color: var(--red); color: var(--red); }
.prio.p2.sel { border-color: var(--orange); color: var(--orange); }
.prio.p3.sel { border-color: var(--blue); color: var(--blue); }
.prio.p0.sel { border-color: var(--muted); color: var(--text); }
.subtasks { display: grid; gap: 6px; margin-bottom: 8px; }
.subtask { display: flex; align-items: center; gap: 10px; background: var(--bg-card); border-radius: 8px; padding: 8px 10px; }
.subtask input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--blue); }
.subtask span { flex: 1; font-size: .92rem; }
.subtask span.done { text-decoration: line-through; color: var(--muted); }
.subtask .del { background: none; border: none; color: var(--muted); }
.subtask .del:hover { color: var(--red); }
#d-save { width: 100%; margin-top: 6px; }

.scrim { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 20; opacity: 0; pointer-events: none; transition: opacity .15s; }

/* ---------- Mobile ---------- */
@media (max-width: 760px) {
  .app { grid-template-columns: 1fr; }
  #menu-btn { display: block; }
  .sidebar {
    position: fixed; top: 0; bottom: 0; left: 0; width: min(300px, 85vw); z-index: 30;
    transform: translateX(-100%); transition: transform .18s ease;
    padding-top: calc(14px + env(safe-area-inset-top));
  }
  .sidebar.open { transform: translateX(0); }
  .scrim.show { opacity: 1; pointer-events: auto; }
  .main { padding: 14px 14px 90px; }
}