:root {
  color-scheme: dark;
  --ink: #090b28;
  --panel: #11143a;
  --panel-2: #171b4b;
  --white: #fffdf4;
  --green: #6dff64;
  --pink: #ff4fd8;
  --orange: #ff9a3d;
  --blue: #45d7ff;
  --purple: #a979ff;
  --muted: #c5c8e8;
  --shadow: 7px 7px 0 #000;
  --radius: 14px;
  font-family: "Arial Black", "Trebuchet MS", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { min-height: 100%; background: var(--ink); }

body {
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  color: var(--white);
  background:
    radial-gradient(circle at 10% 10%, rgba(255, 79, 216, .2), transparent 35%),
    radial-gradient(circle at 90% 80%, rgba(69, 215, 255, .18), transparent 35%),
    var(--ink);
}

button, input { font: inherit; }
button { touch-action: manipulation; }

.background-grid {
  position: fixed;
  inset: 55% 0 0;
  pointer-events: none;
  opacity: .16;
  background-image:
    linear-gradient(var(--blue) 2px, transparent 2px),
    linear-gradient(90deg, var(--blue) 2px, transparent 2px);
  background-size: 38px 38px;
  transform: perspective(240px) rotateX(55deg) scale(1.5);
  transform-origin: center top;
}

.shell {
  position: relative;
  width: min(100% - 24px, 720px);
  margin: 0 auto;
  padding: max(20px, env(safe-area-inset-top)) 0 max(30px, env(safe-area-inset-bottom));
}

.login-card,
.app-card {
  background: linear-gradient(145deg, rgba(23, 27, 75, .98), rgba(9, 11, 40, .98));
  border: 3px solid var(--blue);
  border-radius: 20px;
  box-shadow: 9px 9px 0 var(--pink), 14px 14px 0 #000;
}

.login-card {
  max-width: 430px;
  margin: clamp(30px, 10vh, 100px) auto 0;
  padding: 28px;
}

.brand-mark {
  display: grid;
  width: 74px;
  height: 74px;
  place-items: center;
  margin-bottom: 22px;
  color: var(--ink);
  background: var(--green);
  border: 3px solid var(--white);
  box-shadow: 5px 5px 0 var(--pink);
  font-size: 1.25rem;
  transform: rotate(-4deg);
}

.eyebrow,
.panel-kicker {
  margin: 0;
  color: var(--green);
  font-size: .76rem;
  letter-spacing: .16em;
}

h1, h2, p { overflow-wrap: anywhere; }

h1 {
  margin: 6px 0 26px;
  font-size: clamp(2.2rem, 10vw, 4rem);
  line-height: .9;
  letter-spacing: -.055em;
  text-transform: uppercase;
}

h1 span { color: var(--pink); }
h2 { margin: 3px 0 0; font-size: 1.9rem; line-height: 1; text-transform: uppercase; }

.stack { display: grid; gap: 10px; }
label { font-size: .9rem; }

input[type="text"],
input[type="password"],
input[type="date"],
input:not([type]) {
  width: 100%;
  min-height: 48px;
  border: 2px solid var(--blue);
  border-radius: 8px;
  outline: 0;
  padding: 10px 12px;
  color: var(--white);
  background: #06071b;
  font-family: "Trebuchet MS", system-ui, sans-serif;
  font-size: 1rem;
}

input:focus-visible, button:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

.button,
.icon-button,
.mini-action,
.task-check {
  min-height: 44px;
  border: 2px solid var(--white);
  border-radius: 7px;
  color: var(--white);
  background: var(--panel-2);
  cursor: pointer;
}

.button { padding: 10px 15px; box-shadow: 3px 3px 0 #000; font-size: .82rem; }
.button:hover, .mini-action:hover, .icon-button:hover { background: #292f7d; }
.button:disabled, button:disabled { opacity: .45; cursor: not-allowed; }
.button-primary { color: var(--ink); background: var(--green); border-color: var(--green); }
.button-primary:hover { background: #a1ff9a; }
.button-small { min-height: 40px; padding: 8px 11px; font-size: .7rem; }

.message {
  min-height: 1.4em;
  margin: 6px 0 0;
  color: var(--orange);
  font-family: "Trebuchet MS", system-ui, sans-serif;
  font-size: .92rem;
  font-weight: 700;
}

.app-card { overflow: hidden; }
.app-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 20px 14px; }
.app-header h1 { margin: 5px 0 0; font-size: clamp(2rem, 10vw, 3.3rem); }

.day-switcher {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  align-items: stretch;
  gap: 9px;
  padding: 13px 16px;
  background: var(--pink);
  border-block: 3px solid var(--white);
}

.icon-button { font-size: 1.5rem; color: var(--ink); background: var(--orange); border-color: var(--ink); }
.date-label { display: grid; place-items: center; color: var(--ink); font-size: 1rem; text-transform: uppercase; }
.date-label input { position: absolute; width: 1px; height: 1px; padding: 0; opacity: 0; pointer-events: none; }
.date-label span { text-align: center; cursor: pointer; }

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  padding: 12px 12px 0;
  background: #06071b;
}

.tab {
  min-height: 50px;
  border: 0;
  border-radius: 9px 9px 0 0;
  color: var(--white);
  background: #292d67;
  cursor: pointer;
}

.tab:nth-child(1) { border-top: 5px solid var(--green); }
.tab:nth-child(2) { border-top: 5px solid var(--pink); }
.tab:nth-child(3) { border-top: 5px solid var(--green); }
.tab.is-active { color: var(--ink); background: var(--white); }

.panel { min-height: 360px; padding: 25px 16px 30px; background: var(--white); color: var(--ink); }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 22px; }
.panel-kicker { color: #7b0068; }
.count { flex: 0 0 auto; padding: 6px 8px; border: 2px solid var(--ink); background: var(--orange); font-size: .72rem; transform: rotate(2deg); }

.study-task {
  display: grid;
  grid-template-columns: 54px 1fr;
  align-items: center;
  gap: 14px;
  min-height: 90px;
  padding: 18px;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: var(--green);
  box-shadow: var(--shadow);
  font-size: 1.15rem;
  cursor: pointer;
}

.study-task input { position: absolute; opacity: 0; }
.custom-check { display: grid; width: 52px; height: 52px; place-items: center; border: 4px solid var(--ink); border-radius: 9px; background: var(--white); }
.study-task input:checked + .custom-check { background: var(--pink); }
.study-task input:checked + .custom-check::after { content: "✓"; font-size: 2rem; }
.study-task.is-locked { cursor: default; opacity: .88; }
.study-task:has(input:focus-visible) { outline: 4px solid var(--blue); outline-offset: 3px; }
.muted { margin: 18px 2px 0; color: #4c4e69; font-family: "Trebuchet MS", system-ui, sans-serif; }

.study-completed {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 14px;
  border: 3px solid var(--ink);
  border-radius: 11px;
  background: var(--green);
  box-shadow: 4px 4px 0 var(--ink);
  font-family: "Trebuchet MS", system-ui, sans-serif;
  font-size: 1.02rem;
  font-weight: 800;
}

.completed-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 7px;
  color: var(--ink);
  background: var(--pink);
  font-family: "Arial Black", "Trebuchet MS", system-ui, sans-serif;
  font-size: 1.4rem;
  cursor: pointer;
}

.completed-icon:hover { background: #ff8be7; }

.inline-form, .add-form { display: flex; gap: 8px; margin-bottom: 18px; }
.inline-form { flex-wrap: wrap; }
.inline-form input, .add-form input { flex: 1 1 180px; border-color: var(--ink); color: var(--ink); background: #fff; }
.inline-form input:focus-visible, .add-form input:focus-visible { outline-color: #7b0068; }

.task-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.task-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 3px solid var(--ink);
  border-radius: 11px;
  background: var(--green);
  box-shadow: 4px 4px 0 var(--ink);
}
.task-item:nth-child(even) { background: var(--pink); }
.task-check { width: 44px; padding: 0; color: var(--ink); background: var(--white); border-color: var(--ink); font-size: 1.4rem; }
.task-check span { visibility: hidden; }
.task-check:hover span { visibility: visible; }
.task-text { min-width: 0; font-family: "Trebuchet MS", system-ui, sans-serif; font-size: 1.02rem; font-weight: 800; line-height: 1.35; }
.task-actions { grid-column: 2; display: grid; grid-template-columns: repeat(4, 44px); justify-content: end; gap: 6px; }
.mini-action { width: 44px; padding: 0; color: var(--white); background: var(--ink); font-size: 1.15rem; }
.task-item.is-complete { background: #fff200; box-shadow: 4px 4px 0 var(--ink); opacity: 1; }
.task-item.is-complete .task-check { background: var(--pink); }
.task-item.is-complete .task-check span { visibility: visible; }
.task-item.is-complete .task-actions { display: none; }

.empty-state { padding: 28px 16px; border: 3px dashed #747799; border-radius: var(--radius); color: #4c4e69; text-align: center; font-family: "Trebuchet MS", system-ui, sans-serif; font-weight: 700; }
.history-heading { margin: 22px 0 8px; color: #5f0061; font-size: .75rem; letter-spacing: .12em; }
.app-message { margin: 0; padding: 0 18px 18px; color: var(--orange); background: var(--white); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
[hidden] { display: none !important; }

@media (min-width: 600px) {
  .shell { padding-top: 44px; }
  .app-header { padding-inline: 28px; }
  .panel { padding: 30px 28px 38px; }
  .task-item { grid-template-columns: 44px minmax(0, 1fr) auto; }
  .task-actions { grid-column: 3; }
}

@media (prefers-reduced-motion: no-preference) {
  .app-card:not([hidden]), .login-card:not([hidden]) { animation: arrive .35s ease-out both; }
  @keyframes arrive { from { opacity: 0; transform: translateY(8px); } }
}