/* Modern, mobile-first styling */
:root {
  --bg: #0f1115;
  --bg-alt: #181b21;
  --panel: #1f242c;
  --panel-alt: #262d37;
  --border: #2f3742;
  --primary: #3b82f6;
  --primary-hover: #1d4ed8;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warn: #f59e0b;
  --text: #f1f5f9;
  --text-dim: #94a3b8;
  --radius: 14px;
  --shadow: 0 2px 4px -2px rgba(0,0,0,0.4), 0 8px 24px -4px rgba(0,0,0,0.35);
  --focus: 0 0 0 2px rgba(59,130,246,.65), 0 0 0 4px rgba(59,130,246,.25);
  font-family: system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 25% 15%, #1c2230, #0f1115 60%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  padding: clamp(12px,2vw,32px) 12px 60px;
}

h1, h2 { font-weight: 600; letter-spacing: .5px; }

#login-container, #app-container {
  width: 100%;
  max-width: 640px;
  margin: clamp(12px,4vh,48px) auto 0;
  background: linear-gradient(145deg,var(--panel),var(--panel-alt));
  padding: clamp(18px,3.2vw,40px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px) saturate(150%);
}

/* Form controls */
input, button {
  font: inherit;
  border: none;
  outline: none;
}

input {
  background: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  width: 100%;
  transition: border-color .2s, background .2s;
}
/* Mobile visibility tweaks for time input */
input[type="time"] {
  letter-spacing: .5px;
  min-width: 120px;
  position: relative;
}
input[type="time"]::-webkit-calendar-picker-indicator { filter: invert(70%); opacity: .85; cursor: pointer; }
input[type="time"]:focus::-webkit-calendar-picker-indicator { filter: invert(100%); }
input:focus { border-color: var(--primary); box-shadow: var(--focus); }
input::placeholder { color: var(--text-dim); }

button {
  background: var(--primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 500;
  letter-spacing: .3px;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
  min-height: 44px; /* mobile tap size */
  line-height: 1;
  transition: background .18s, transform .15s;
  cursor: pointer;
  position: relative;
}
button:hover { background: var(--primary-hover); }
button:active { transform: translateY(2px); }
button:focus-visible { box-shadow: var(--focus); }
button.danger { background: var(--danger); }
button.danger:hover { background: var(--danger-hover); }
button.outline { background: var(--bg-alt); border: 1px solid var(--border); }
button.outline:hover { background: var(--panel-alt); }
button.secondary { background: var(--panel-alt); }
button.secondary:hover { background: var(--bg-alt); }

.error { color: var(--danger); margin-top: 8px; font-size: .9rem; }

#task-controls, #filter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 6px 0 10px;
}

#task-controls input[type="text"] { flex: 1 1 240px; }
#task-controls input[type="time"] { flex: 0 1 140px; }
#task-controls button { flex: 0 1 auto; }

#filter-controls button { flex: 1 1 100px; font-size: .9rem; padding: 10px 8px; }
#filter-controls .filter-btn.active { background: var(--primary-hover); }

#remaining { margin: 4px 0 14px; color: var(--text-dim); font-size: .95rem; }

#tasks { display: grid; gap: 12px; margin-top: 16px; }

.task-card {
  display: grid;
  grid-template-columns: 44px 1fr 36px;
  gap: 4px 10px;
  align-items: stretch;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 10px 12px 12px 10px;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: border-color .25s, background .35s, transform .25s;
  min-height: 64px;
}
.task-card::before { /* subtle gradient sheen */
  content: "";
  position: absolute; inset: 0; pointer-events: none; opacity: 0;
  background: radial-gradient(circle at 85% 15%, rgba(255,255,255,.08), transparent 60%);
  transition: opacity .4s;
}
.task-card:hover { transform: translateY(-3px); border-color: var(--primary); }
.task-card:hover::before { opacity: 1; }

.task-card.overdue { border-color: var(--danger); box-shadow: 0 0 0 1px var(--danger) inset, var(--shadow); }
.task-card.overdue::after {
  content: "OVERDUE";
  position: absolute; top: 10px; right: -28px;
  transform: rotate(35deg);
  background: var(--danger);
  color: #fff; font-size: .55rem; letter-spacing: 1px; font-weight: 600;
  padding: 4px 34px; border-radius: 4px; opacity: .9;
  box-shadow: 0 2px 6px -1px rgba(0,0,0,.4);
}

.task-body { display: flex; flex-direction: column; justify-content: center; gap: 2px; width: 100%; align-items: flex-start; }
.task-text { font-size: .97rem; line-height: 1.35; margin-right: 4px; word-break: break-word; text-align: left; }
.task-time { text-align: left; }
.task-text.done { text-decoration: line-through; color: var(--text-dim); }

.task-time { font-size: .75rem; color: var(--text-dim); letter-spacing: .5px; margin-top: 4px; display: inline-block; }
.task-time.overdue { color: var(--danger); font-weight: 600; }

.icon-btn { background: var(--bg-alt); border: 1px solid var(--border); color: var(--text-dim); width: 38px; height: 38px; padding: 0; display: inline-flex; align-items: center; justify-content: center; font-size: .95rem; border-radius: 12px; transition: background .25s, border-color .25s, color .25s; }
.icon-btn:hover { background: var(--panel); color: var(--text); border-color: var(--primary); }
.icon-btn:active { transform: translateY(2px); }
.check-btn { font-size: 1.05rem; }
.check-btn { color: var(--primary); }
.del-btn { color: var(--danger); }
.del-btn:hover { border-color: var(--danger); background: rgba(239,68,68,.08); color: var(--danger); }

#logout-btn { width: 100%; margin-top: 28px; background: linear-gradient(90deg,var(--primary),var(--primary-hover)); }
#logout-btn:hover { filter: brightness(1.1); }

/* Smaller screens */
@media (max-width: 520px) {
  #task-controls input[type="text"] { flex: 1 1 100%; }
  #task-controls input[type="time"] { flex: 1 1 140px; }
  #task-controls button { flex: 1 1 calc(50% - 10px); }
  .task-card { grid-template-columns: 40px 1fr 34px; padding: 14px 14px 16px 8px; }
  .icon-btn { width: 34px; height: 34px; }
  .task-text { font-size: .94rem; }
}

/* Motion reduce preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}