:root{
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;

  --shadow: 0 10px 30px rgba(17,24,39,.08);
  --radius: 14px;

  --toggle-w: 54px;
  --toggle-h: 30px;
  --toggle-pad: 3px;
  --toggle-knob: calc(var(--toggle-h) - (var(--toggle-pad) * 2));

  /* Motion */
  --ease: cubic-bezier(.2,.8,.2,1);
  --dur-1: 160ms;
  --dur-2: 260ms;
  --dur-3: 420ms;
}

[data-theme="dark"]{
  --bg: #0b1220;
  --card: #0f172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #22304e;

  --primary: #3b82f6;
  --primary-hover: #2563eb;

  --shadow: 0 12px 34px rgba(0,0,0,.35);
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  transition: background-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}

.wrap{
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 18px 40px;
}

header{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.brand{
  display:flex;
  flex-direction:column;
  gap: 6px;
}
.brand h1{
  margin:0;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.brand p{
  margin:0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
  max-width: 54ch;
}

.header-actions{
  display:flex;
  align-items:center;
  gap: 10px;
  margin-top: 2px;
  flex-shrink: 0;
}

@media (max-width: 720px){
  header{ flex-direction: column; }
  .header-actions{ align-self: flex-start; }
}

/* ===== Theme Toggle (animated) ===== */
.theme-toggle{
  display:flex;
  align-items:center;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
  user-select:none;
}

.switch{
  position: relative;
  width: var(--toggle-w);
  height: var(--toggle-h);
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.55);
  cursor: pointer;
  transition: background-color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease), transform var(--dur-1) var(--ease);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.02);
  outline: none;
}
[data-theme="dark"] .switch{
  background: rgba(255,255,255,.06);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.03);
}
.switch:active{ transform: scale(.98); }
.switch:focus-visible{
  box-shadow: 0 0 0 4px rgba(37,99,235,.18), inset 0 0 0 1px rgba(0,0,0,.02);
}

.knob{
  position:absolute;
  top: var(--toggle-pad);
  left: var(--toggle-pad);
  width: var(--toggle-knob);
  height: var(--toggle-knob);
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid rgba(0,0,0,.06);
  display:flex;
  align-items:center;
  justify-content:center;

  transform: translateX(0);
  transition: transform var(--dur-2) var(--ease), background-color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
  will-change: transform;
}
[data-theme="dark"] .knob{
  transform: translateX(calc(var(--toggle-w) - var(--toggle-h)));
  background: #0b1220;
  border-color: rgba(255,255,255,.10);
}

.icon{
  width: 16px;
  height: 16px;
  display:block;
  opacity: .92;
  transition: transform var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease);
}
.switch.toggling .icon{ transform: scale(1.12); }

.icon-sun{ display:block; }
.icon-moon{ display:none; }
[data-theme="dark"] .icon-sun{ display:none; }
[data-theme="dark"] .icon-moon{ display:block; }

/* ===== Card / Layout ===== */
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow:hidden;
  transition: background-color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
  /* subtle entrance */
  animation: cardIn var(--dur-3) var(--ease) both;
}
@keyframes cardIn{
  from{ opacity: 0; transform: translateY(10px); }
  to{ opacity: 1; transform: translateY(0); }
}

.section{ padding: 18px; }
.section + .section{
  border-top: 1px solid var(--border);
  transition: border-color var(--dur-2) var(--ease);
}

.grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.grid-2{
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 720px){
  .grid{ grid-template-columns: 1fr; }
  .grid-2{ grid-template-columns: 1fr 1fr; }
}

label{
  display:block;
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 8px;
  transition: color var(--dur-2) var(--ease);
}

input, textarea, button{ font: inherit; }

input{
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  outline: none;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease), background-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}
input:focus{
  border-color: rgba(37,99,235,.55);
  box-shadow: 0 0 0 4px rgba(37,99,235,.12);
}

/* Textarea */
textarea{
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  outline: none;
  resize: vertical;
  min-height: 92px;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease), background-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}
textarea:focus{
  border-color: rgba(37,99,235,.55);
  box-shadow: 0 0 0 4px rgba(37,99,235,.12);
}

.actions{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items:center;
  padding-top: 6px;
}

.btn{
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 11px 14px;
  cursor: pointer;
  transition: background var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease), filter var(--dur-1) var(--ease);
  user-select:none;
}
.btn:active{ transform: translateY(1px) scale(.99); }

.btn-primary{
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover{ background: var(--primary-hover); }

.btn-ghost{
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover{ background: rgba(17,24,39,.04); }
[data-theme="dark"] .btn-ghost:hover{ background: rgba(255,255,255,.06); }

.note{
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}

.hint{
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

/* Errors */
.error{ color: #b91c1c; }
[data-theme="dark"] .error{ color: #fca5a5; }

.input-invalid{
  border-color: rgba(185, 28, 28, .55) !important;
  box-shadow: 0 0 0 4px rgba(185, 28, 28, .12) !important;
}

/* Results */
.results-head{ margin-bottom: 10px; }
.results-title{
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.list{
  display:grid;
  gap: 10px;
}

.item{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 12px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  transition: border-color var(--dur-2) var(--ease), background-color var(--dur-2) var(--ease), transform var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease);
  /* entrance each render (JS adds .enter) */
  opacity: 0;
  transform: translateY(6px);
}

.item.enter{
  opacity: 1;
  transform: translateY(0);
}

.best{
  border-color: rgba(37,99,235,.25);
  background: rgba(37,99,235,.03);
}

.left{
  display:flex;
  flex-direction:column;
  gap: 4px;
  min-width: 0;
}

.time{
  display:flex;
  align-items:center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.meta{
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
  overflow:hidden;
  text-overflow: ellipsis;
  max-width: 56ch;
}

.badge{
  font-size: 12px;
  padding: 5px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: rgba(255,255,255,.5);
}
[data-theme="dark"] .badge{ background: rgba(255,255,255,.06); }

.copy{
  width: auto;
  padding: 9px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor:pointer;
  transition: background-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}
.copy:hover{ background: rgba(17,24,39,.04); }
[data-theme="dark"] .copy:hover{ background: rgba(255,255,255,.06); }
.copy:active{ transform: scale(.98); }

/* Copy success micro-animation */
.copy.copied{
  animation: copiedPop var(--dur-2) var(--ease) both;
}
@keyframes copiedPop{
  from{ box-shadow: 0 0 0 rgba(37,99,235,0); }
  to{ box-shadow: 0 0 0 4px rgba(37,99,235,.12); }
}

.note-box{
  margin-top: 14px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.5);
  transition: background-color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
  animation: fadeIn var(--dur-3) var(--ease) both;
}
[data-theme="dark"] .note-box{
  background: rgba(255,255,255,.06);
}

.note-box-title{
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.note-box-text{
  color: var(--muted);
  white-space: pre-wrap;
  line-height: 1.4;
}

footer{
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

@keyframes fadeIn{
  from{ opacity: 0; transform: translateY(6px); }
  to{ opacity: 1; transform: translateY(0); }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce){
  *{
    animation: none !important;
    transition: none !important;
  }
  .item{ opacity: 1; transform: none; }
}