/* ========== Design Tokens (Dark-only) ========== */
:root {
  --bg: #0f1115;
  --card: #171a21;
  --card-2: #1d2230;
  --text: #e8ecf1;
  --muted: #9aa4b2;
  --accent: #7c4dff; /* primary */
  --accent-2: #22c55e; /* success */
  --danger: #ef4444; /* delete */
  --ring: rgba(124, 77, 255, 0.45);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --gap: 14px;
  --trans: 180ms cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
}

/* ========== Base ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  display: grid;
  place-items: center;
  background: radial-gradient(
      1200px 800px at 70% -10%,
      rgba(124, 77, 255, 0.08),
      transparent 60%
    ),
    radial-gradient(
      900px 600px at -10% 110%,
      rgba(34, 197, 94, 0.08),
      transparent 60%
    ),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========== Container Card ========== */
.container {
  width: min(92vw, 560px);
  background: linear-gradient(180deg, var(--card), var(--card-2));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  gap: calc(var(--gap) + 4px);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

/* Header */
.container h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 26px);
  letter-spacing: 0.2px;
  line-height: 1.2;
}
.container h3 {
  margin: 0;
  font-size: clamp(16px, 2.2vw, 18px);
  font-weight: 600;
  color: var(--muted);
}

/* ========== Form ========== */
#expense-form {
  display: grid;
  grid-template-columns: 1fr 140px auto;
  gap: var(--gap);
}

@media (max-width: 520px) {
  #expense-form {
    grid-template-columns: 1fr 1fr;
  }
  #expense-form button {
    grid-column: 1 / -1;
  }
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
  width: 100%;
  appearance: none;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--trans), box-shadow var(--trans),
    background var(--trans), transform var(--trans);
}

input::placeholder {
  color: var(--muted);
  opacity: 0.9;
}

input:focus-visible,
select:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--ring);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-1px);
}

/* Buttons */
button {
  appearance: none;
  border: none;
  background: var(--accent);
  color: white;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--trans), filter var(--trans),
    box-shadow var(--trans), background var(--trans);
  box-shadow: 0 6px 16px rgba(124, 77, 255, 0.28);
}

button:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}
button:active {
  transform: translateY(0);
  filter: brightness(0.98);
}
button:focus-visible {
  box-shadow: 0 0 0 4px var(--ring), 0 6px 16px rgba(124, 77, 255, 0.28);
}

/* Delete button variation */
.dltBtn {
  background: var(--danger);
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.25);
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  font-size: 13px;
}
.dltBtn:hover {
  filter: brightness(1.05);
}
.dltBtn:focus-visible {
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.35);
}

/* ========== List ========== */
#expense-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  max-height: 45vh;
  overflow: auto;
  padding-right: 4px; /* space for scrollbar */
}

/* Pretty scrollbar (webkit) */
#expense-list::-webkit-scrollbar {
  width: 10px;
}
#expense-list::-webkit-scrollbar-track {
  background: transparent;
}
#expense-list::-webkit-scrollbar-thumb {
  background: linear-gradient(
    180deg,
    rgba(124, 77, 255, 0.35),
    rgba(34, 197, 94, 0.35)
  );
  border-radius: 999px;
}

/* Each item */
#expense-list li {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-xs);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  transition: background var(--trans), border-color var(--trans),
    transform var(--trans);
}

#expense-list li:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

/* Name & Amount group */
.expense__name {
  font-weight: 600;
  letter-spacing: 0.2px;
}
.expense__amount {
  color: var(--muted);
  font-weight: 600;
}

/* Right actions */
.expense__actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ========== Total Bar ========== */
#total {
  background: linear-gradient(
    90deg,
    rgba(124, 77, 255, 0.12),
    rgba(34, 197, 94, 0.12)
  );
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Make the number pop */
#total-amount {
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  letter-spacing: 0.3px;
}

/* ========== Subtle motion preference ========== */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}