/* ============================================================
   Task Manager — Illia Hudz
   Shares the portfolio's design language (tokens, fonts, theme)
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  color-scheme: light;
  --bg:        #ffffff;
  --bg-soft:   #f5f7fa;
  --ink:       #16181a;
  --ink-soft:  #4d5358;
  --ink-faint: #868d92;
  --accent:    #4A6FA5;
  --accent-soft:#e7edf5;
  --on-accent: #ffffff;
  --line:      #e6e8ec;
  --danger:    #c0463b;

  --display: "Playfair Display", Georgia, serif;
  --sans:    "DM Sans", system-ui, sans-serif;

  --maxw: 720px;
  --pad: clamp(1.25rem, 5vw, 3rem);
}

/* ---------- Dark theme ---------- */
[data-theme="dark"] {
  color-scheme: dark;
  --bg:        #14161a;
  --bg-soft:   #1d2026;
  --ink:       #f1f2f4;
  --ink-soft:  #b4b9c0;
  --ink-faint: #7e848c;
  --accent:    #8aa9de;
  --accent-soft:#232b3a;
  --on-accent: #11141a;
  --line:      #2a2e37;
  --danger:    #e08178;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.7;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  transition: background-color .3s ease, color .3s ease;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--accent); color: var(--on-accent); }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad); }
.app { flex: 1; padding-bottom: 4rem; }

/* ---------- Nav ---------- */
header.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
header.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 1rem var(--pad);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { font-family: var(--display); font-size: 1.2rem; font-weight: 700; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
.nav-right { display: flex; align-items: center; gap: 1.25rem; }

.back-link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-size: 0.9rem; font-weight: 500; color: var(--ink-soft);
  transition: color .2s ease, transform .2s ease;
}
.back-link svg { width: 17px; height: 17px; }
.back-link:hover { color: var(--accent); transform: translateX(-2px); }

/* Theme toggle */
.theme-toggle {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; flex: none;
  border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--ink-soft); cursor: pointer;
  transition: color .2s ease, border-color .2s ease, transform .2s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* Language toggle */
.lang-toggle {
  height: 38px; padding: 0 0.85rem; flex: none;
  border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--ink-soft); cursor: pointer;
  font-family: var(--sans); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.06em;
  transition: color .2s ease, border-color .2s ease, transform .2s ease;
}
.lang-toggle:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }

/* ---------- App header ---------- */
.app-head { padding-block: clamp(2.5rem, 8vw, 4rem) clamp(1.5rem, 4vw, 2.25rem); }
.eyebrow {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 1rem;
}
.app-head h1 {
  font-family: var(--display); font-weight: 600; line-height: 1.12; letter-spacing: -0.01em;
  font-size: clamp(2.25rem, 1.5rem + 3vw, 3.25rem); margin: 0;
}
.lead { color: var(--ink-soft); max-width: 52ch; margin: 1rem 0 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.9rem; font-weight: 500; letter-spacing: 0.01em;
  padding: 0.7rem 1.25rem; border: 1px solid var(--line); border-radius: 3px;
  color: var(--ink); background: transparent; cursor: pointer;
  transition: border-color .2s ease, color .2s ease, background .2s ease, transform .2s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn--solid { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn--solid:hover { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn svg { width: 16px; height: 16px; }

/* ---------- Add form ---------- */
.add-form { display: flex; gap: 0.6rem; margin-bottom: 1.75rem; }
.task-input {
  flex: 1; min-width: 0;
  font-family: var(--sans); font-size: 1rem; color: var(--ink);
  padding: 0.85rem 1rem; border: 1px solid var(--line); border-radius: 4px;
  background: var(--bg); transition: border-color .2s ease, box-shadow .2s ease;
}
.task-input::placeholder { color: var(--ink-faint); }
.task-input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  margin-bottom: 1.25rem; flex-wrap: wrap;
}
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.filter-btn {
  font-size: 0.82rem; font-weight: 500;
  padding: 0.4rem 0.85rem; border: 1px solid var(--line); border-radius: 999px;
  background: var(--bg); color: var(--ink-soft); cursor: pointer;
  transition: all .2s ease;
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.count { font-size: 0.85rem; color: var(--ink-faint); white-space: nowrap; }

/* ---------- Task list ---------- */
.task-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.6rem; }

.task {
  display: flex; align-items: center; gap: 0.85rem;
  padding: 0.9rem 1rem; border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease, opacity .25s ease;
  animation: taskIn .25s ease;
}
.task:hover { border-color: var(--accent); box-shadow: 0 8px 24px -18px rgba(74,111,165,0.55); }
@keyframes taskIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
.task.removing { opacity: 0; transform: translateX(12px); }

/* Custom checkbox */
.task-check {
  flex: none; width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid var(--ink-faint); background: transparent; cursor: pointer;
  display: inline-grid; place-items: center; padding: 0;
  transition: border-color .2s ease, background .2s ease;
}
.task-check svg { width: 12px; height: 12px; color: var(--on-accent); opacity: 0; transform: scale(.5); transition: opacity .2s ease, transform .2s ease; }
.task-check:hover { border-color: var(--accent); }
.task.done .task-check { background: var(--accent); border-color: var(--accent); }
.task.done .task-check svg { opacity: 1; transform: scale(1); }

.task-text {
  flex: 1; min-width: 0; word-break: break-word; color: var(--ink); line-height: 1.4;
  transition: color .2s ease;
}
.task.done .task-text { color: var(--ink-faint); text-decoration: line-through; }

.task-del {
  flex: none; display: inline-grid; place-items: center;
  width: 32px; height: 32px; border-radius: 5px;
  border: 1px solid transparent; background: transparent; color: var(--ink-faint); cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}
.task-del svg { width: 16px; height: 16px; }
.task-del:hover { color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); }

/* ---------- Empty state ---------- */
.empty {
  text-align: center; color: var(--ink-faint); padding: 3.5rem 1rem;
  border: 1px dashed var(--line); border-radius: 8px;
}
.empty svg { width: 40px; height: 40px; color: var(--accent); opacity: 0.55; margin: 0 auto 0.85rem; }
.empty p { margin: 0; }

/* ---------- List footer ---------- */
.list-foot { margin-top: 1.5rem; display: flex; justify-content: flex-end; }
[hidden] { display: none !important; }
.link-btn {
  font-size: 0.85rem; font-weight: 500; color: var(--ink-faint);
  background: transparent; border: none; cursor: pointer; padding: 0.3rem 0;
  transition: color .2s ease;
}
.link-btn:hover { color: var(--danger); }

/* ---------- Footer ---------- */
footer.foot {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
  font-size: 0.8rem; color: var(--ink-faint); letter-spacing: 0.02em;
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; justify-content: space-between;
}

@media (prefers-reduced-motion: reduce) {
  .task, .task.removing { animation: none; transition: none; }
  .btn:hover, .theme-toggle:hover, .lang-toggle:hover, .back-link:hover { transform: none; }
  body { transition: none; }
}