/* ═══════════════════════════════════════════════════
   Glassy To-Do · style.css
   Aesthetic: Glassmorphism — deep dark gradient,
   frosted-glass card, luminous orbs, soft blurs
   Fonts: Outfit (display/body) · Fira Code (meta)
   ═══════════════════════════════════════════════════ */

/* ── Tokens ── */
:root {
  --bg-from: #0f0c29;
  --bg-mid:  #302b63;
  --bg-to:   #24243e;

  --glass-bg:       rgba(255,255,255,.07);
  --glass-border:   rgba(255,255,255,.14);
  --glass-shadow:   0 8px 64px rgba(0,0,0,.45), 0 0 0 1px rgba(255,255,255,.08);
  --glass-inner:    rgba(255,255,255,.04);

  --item-bg:        rgba(255,255,255,.06);
  --item-border:    rgba(255,255,255,.10);
  --item-hover:     rgba(255,255,255,.10);

  --text:    #f0f0ff;
  --text2:   rgba(240,240,255,.6);
  --text3:   rgba(240,240,255,.35);

  --accent:  #a78bfa;   /* violet */
  --accent2: #818cf8;   /* indigo */

  --p-low:    #4ade80;
  --p-medium: #facc15;
  --p-high:   #f87171;

  --r-card: 28px;
  --r-item: 14px;
  --r-sm:   8px;
  --r-pill: 99px;

  --t: .22s cubic-bezier(.4,0,.2,1);
  --spring: .3s cubic-bezier(.34,1.56,.64,1);

  --font-ui:   'Outfit', system-ui, sans-serif;
  --font-code: 'Fira Code', monospace;
}

/* Light theme */
[data-theme="light"] {
  --bg-from: #e0e7ff;
  --bg-mid:  #c7d2fe;
  --bg-to:   #ddd6fe;

  --glass-bg:     rgba(255,255,255,.55);
  --glass-border: rgba(255,255,255,.75);
  --glass-shadow: 0 8px 48px rgba(99,77,200,.18), 0 0 0 1px rgba(255,255,255,.6);
  --glass-inner:  rgba(255,255,255,.3);

  --item-bg:     rgba(255,255,255,.50);
  --item-border: rgba(255,255,255,.70);
  --item-hover:  rgba(255,255,255,.75);

  --text:  #1e1b4b;
  --text2: rgba(30,27,75,.65);
  --text3: rgba(30,27,75,.38);

  --accent:  #7c3aed;
  --accent2: #4f46e5;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-ui);
  min-height: 100dvh;
  background: linear-gradient(135deg, var(--bg-from) 0%, var(--bg-mid) 50%, var(--bg-to) 100%);
  background-attachment: fixed;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px 80px;
  position: relative;
  overflow-x: hidden;
  transition: background var(--t);
}

/* ── Ambient orbs ── */
.orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(80px);
  opacity: .55;
  animation: orbDrift 18s ease-in-out infinite alternate;
}

.orb--1 { width: 520px; height: 520px; background: radial-gradient(circle, #7c3aed 0%, transparent 70%); top: -140px; left: -120px; animation-duration: 20s; }
.orb--2 { width: 420px; height: 420px; background: radial-gradient(circle, #2563eb 0%, transparent 70%); bottom: -100px; right: -80px; animation-duration: 24s; animation-delay: -8s; }
.orb--3 { width: 280px; height: 280px; background: radial-gradient(circle, #db2777 0%, transparent 70%); top: 50%; left: 55%; animation-duration: 16s; animation-delay: -4s; opacity: .35; }

@keyframes orbDrift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, 30px) scale(1.08); }
}

[data-theme="light"] .orb { opacity: .3; filter: blur(100px); }

/* ── App wrapper ── */
.app-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 620px;
}

/* ── Glass card ── */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-card);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  padding: 30px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: cardIn .5s cubic-bezier(.4,0,.2,1) both;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(24px) scale(.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Header ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header__left { display: flex; align-items: center; gap: 14px; }

/* Three-dot logo */
.header__logo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  width: 32px;
}

.logo-dot {
  width: 13px; height: 13px;
  border-radius: 50%;
}
.logo-dot--1 { background: var(--accent); opacity: .9; }
.logo-dot--2 { background: #60a5fa; opacity: .8; }
.logo-dot--3 { background: #f472b6; opacity: .8; grid-column: 1 / -1; justify-self: center; }

.header__title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
  line-height: 1;
}

.header__sub {
  font-family: var(--font-code);
  font-size: .65rem;
  color: var(--text3);
  margin-top: 2px;
  letter-spacing: .04em;
}

/* Theme button */
.btn-theme {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  background: var(--glass-inner);
  border: 1px solid var(--item-border);
  border-radius: var(--r-pill);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background var(--t), border-color var(--t), transform var(--t);
  white-space: nowrap;
}
.btn-theme:hover { background: var(--item-hover); transform: translateY(-1px); }
.btn-theme:active { transform: scale(.95); }

/* ── Input section ── */
.input-row {
  display: flex;
  gap: 10px;
}

.input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--r-item);
  padding: 4px 12px 4px 14px;
  backdrop-filter: blur(8px);
  transition: border-color var(--t), box-shadow var(--t);
}

.input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(167,139,250,.2);
}

.input-wrap.shake {
  animation: shakeX .38s ease both;
  border-color: var(--p-high) !important;
}

@keyframes shakeX {
  0%,100% { transform: translateX(0); }
  15%     { transform: translateX(-6px); }
  30%     { transform: translateX(6px); }
  45%     { transform: translateX(-4px); }
  60%     { transform: translateX(4px); }
  75%     { transform: translateX(-2px); }
}

.input-wrap__icon {
  color: var(--accent);
  font-size: .85rem;
  opacity: .8;
  flex-shrink: 0;
}

.task-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-ui);
  font-size: .92rem;
  color: var(--text);
  caret-color: var(--accent);
  padding: 9px 0;
  min-width: 0;
}

.task-input::placeholder { color: var(--text3); font-style: italic; }

.char-count {
  font-family: var(--font-code);
  font-size: .6rem;
  color: var(--text3);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--t), color var(--t);
}
.char-count.visible { opacity: 1; }
.char-count.warn    { color: var(--p-high); }

/* Add button */
.btn-add {
  width: 48px; height: 48px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  border: none;
  border-radius: var(--r-item);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(167,139,250,.4);
  transition: transform var(--spring), box-shadow var(--t), opacity var(--t);
}
.btn-add:hover  { transform: translateY(-2px) scale(1.05); box-shadow: 0 6px 24px rgba(167,139,250,.55); }
.btn-add:active { transform: scale(.93); }

/* Priority selector */
.priority-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.priority-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--r-pill);
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 500;
  color: var(--text2);
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: all var(--t);
}

.priority-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
}

.priority-btn.active {
  background: rgba(167,139,250,.18);
  border-color: var(--accent);
  color: var(--text);
  box-shadow: 0 2px 12px rgba(167,139,250,.25);
}

.priority-btn:hover:not(.active) { background: var(--item-hover); color: var(--text); }

/* ── Toolbar ── */
.toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
}

.search-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 9px;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--r-pill);
  padding: 0 14px;
  backdrop-filter: blur(8px);
  transition: border-color var(--t), box-shadow var(--t);
}

.search-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(167,139,250,.15);
}

.search-wrap__icon { color: var(--text3); flex-shrink: 0; }

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-ui);
  font-size: .82rem;
  color: var(--text);
  padding: 9px 0;
  caret-color: var(--accent);
}

.search-input::placeholder { color: var(--text3); }

.toolbar__actions { display: flex; gap: 8px; }

.btn-tool {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--r-pill);
  color: var(--text2);
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: all var(--t);
  white-space: nowrap;
}
.btn-tool:hover { background: var(--item-hover); color: var(--text); transform: translateY(-1px); }
.btn-tool:active { transform: scale(.95); }

/* ── Filter nav ── */
.filter-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.filter-track {
  position: relative;
  display: flex;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--r-pill);
  padding: 4px;
  backdrop-filter: blur(8px);
}

.filter-pill {
  position: absolute;
  top: 4px; left: 4px;
  height: calc(100% - 8px);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: var(--r-pill);
  z-index: 0;
  box-shadow: 0 2px 12px rgba(167,139,250,.4);
  transition: transform .22s cubic-bezier(.4,0,.2,1), width .22s cubic-bezier(.4,0,.2,1);
  pointer-events: none;
}

.filter-tab {
  position: relative; z-index: 1;
  padding: 7px 18px;
  background: transparent;
  border: none;
  border-radius: var(--r-pill);
  font-family: var(--font-ui);
  font-size: .8rem;
  font-weight: 500;
  color: var(--text2);
  cursor: pointer;
  transition: color var(--t);
}
.filter-tab:hover  { color: var(--text); }
.filter-tab.active { color: #fff; }

/* Clear button */
.btn-clear {
  padding: 8px 16px;
  background: rgba(248,113,113,.1);
  border: 1px solid rgba(248,113,113,.3);
  border-radius: var(--r-pill);
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 500;
  color: var(--p-high);
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: all var(--t);
  white-space: nowrap;
}
.btn-clear:hover:not(:disabled) { background: rgba(248,113,113,.2); transform: translateY(-1px); }
.btn-clear:active:not(:disabled) { transform: scale(.95); }
.btn-clear:disabled { opacity: .35; cursor: not-allowed; }

/* ── Task list ── */
.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ── Task item ── */
.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 14px;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--r-item);
  backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
  animation: itemIn .28s cubic-bezier(.4,0,.2,1) both;
  transition: background var(--t), border-color var(--t), transform var(--t), box-shadow var(--t), opacity var(--t);
}

@keyframes itemIn {
  from { opacity: 0; transform: translateY(-8px) scale(.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.task-item:hover {
  background: var(--item-hover);
  border-color: rgba(167,139,250,.25);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0,0,0,.25);
}

/* Priority left stripe */
.task-item::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--p-color, transparent);
  opacity: .8;
}

.task-item[data-priority="low"]    { --p-color: var(--p-low); }
.task-item[data-priority="medium"] { --p-color: var(--p-medium); }
.task-item[data-priority="high"]   { --p-color: var(--p-high); }

/* Exit animation */
.task-item.exiting {
  opacity: 0 !important;
  transform: translateX(22px) scale(.97) !important;
  transition: opacity .2s ease, transform .2s ease !important;
  pointer-events: none;
}

/* Staggered load */
.task-item { animation-delay: calc(var(--i, 0) * 50ms); }

/* ── Checkbox ── */
.task-check {
  appearance: none;
  -webkit-appearance: none;
  width: 20px; height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
  border: 1.5px solid var(--item-border);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  position: relative;
  transition: background var(--spring), border-color var(--t), transform var(--spring);
}

.task-check:hover { border-color: var(--accent); transform: scale(1.1); }

.task-check:checked {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-color: transparent;
  animation: checkBounce .28s cubic-bezier(.34,1.56,.64,1) both;
}

@keyframes checkBounce {
  0%   { transform: scale(1); }
  40%  { transform: scale(.75); }
  70%  { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.task-check:checked::after {
  content: '';
  position: absolute;
  left: 5px; top: 2px;
  width: 6px; height: 10px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(43deg);
}

/* ── Task body ── */
.task-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.task-text {
  font-size: .9rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.5;
  word-break: break-word;
  transition: color var(--t), opacity var(--t);
}

.task-item.completed .task-text {
  text-decoration: line-through;
  text-decoration-color: var(--text3);
  color: var(--text2);
  opacity: .6;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-code);
  font-size: .62rem;
  color: var(--text3);
}

.task-priority-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px 7px;
  border-radius: var(--r-pill);
  font-size: .6rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.badge-low    { background: rgba(74,222,128,.12); color: var(--p-low); }
.badge-medium { background: rgba(250,204,21,.12); color: var(--p-medium); }
.badge-high   { background: rgba(248,113,113,.12); color: var(--p-high); }

/* ── Delete button ── */
.task-del {
  width: 28px; height: 28px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 7px;
  color: var(--text3);
  cursor: pointer;
  opacity: 0;
  transform: scale(.7);
  transition: opacity var(--t), transform var(--spring), background var(--t), color var(--t);
}

.task-item:hover .task-del {
  opacity: 1;
  transform: scale(1);
}

.task-del:hover { background: rgba(248,113,113,.15); color: var(--p-high); }
.task-del:active { transform: scale(.88); }

@media (hover: none) {
  .task-del { opacity: 1; transform: scale(1); }
}

/* ── Empty state ── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px 0 32px;
  text-align: center;
  animation: fadeUp .4s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.empty-state__icon {
  font-size: 2.5rem;
  animation: sparkle 3s ease-in-out infinite;
}

@keyframes sparkle {
  0%,100% { transform: scale(1) rotate(0deg); }
  50%      { transform: scale(1.18) rotate(12deg); }
}

#emptyMsg {
  font-size: .88rem;
  color: var(--text2);
  line-height: 1.6;
}

/* ── Stats footer ── */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-code);
  font-size: .7rem;
  color: var(--text3);
  padding-top: 4px;
  border-top: 1px solid rgba(255,255,255,.06);
  flex-wrap: wrap;
}

.stats-bar__dot { opacity: .4; }

/* ── Scrollbar ── */
.task-list::-webkit-scrollbar { width: 4px; }
.task-list::-webkit-scrollbar-track { background: transparent; }
.task-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,.15); border-radius: 99px; }

/* ── Focus ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
:focus:not(:focus-visible) { outline: none; }

/* ── Responsive ── */
@media (max-width: 480px) {
  body { padding: 16px 10px 60px; }
  .glass-card { padding: 20px 16px; gap: 16px; border-radius: 20px; }
  .header__title { font-size: 1.25rem; }
  .filter-tab { padding: 7px 12px; font-size: .75rem; }
  .toolbar { flex-wrap: wrap; }
  .search-wrap { min-width: 0; }
  .toolbar__actions { flex: 1; justify-content: flex-end; }
  .btn-tool span:not(svg) { display: none; }
  .task-item { padding: 11px 12px; }
  .task-del { opacity: 1; transform: scale(1); }
  .filter-nav { flex-direction: column; align-items: stretch; }
  .btn-clear { text-align: center; }
}

@media (max-width: 320px) {
  .priority-btn { padding: 5px 10px; font-size: .73rem; }
  .btn-tool { padding: 7px 10px; }
}

[hidden] { display: none !important; }