:root {
  --bg: #0f172a;
  --card: rgba(30, 41, 59, 0.75);
  --card-border: rgba(148, 163, 184, 0.18);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #facc15;
  --accent-2: #ef4444;
  --blue: #3b82f6;
  --green: #4ade80;
  --red: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 10%, rgba(59, 130, 246, 0.35), transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(239, 68, 68, 0.28), transparent 40%),
    radial-gradient(circle at 50% 90%, rgba(250, 204, 21, 0.15), transparent 45%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 40px 16px 24px;
}
header h1 {
  font-family: Bangers, Impact, sans-serif;
  font-size: clamp(2.6rem, 8vw, 4.2rem);
  letter-spacing: 3px;
  margin: 0;
  color: var(--accent);
  text-shadow: 3px 3px 0 var(--accent-2), 6px 6px 0 #000;
  transform: rotate(-2deg);
}
header p { margin: 12px 0 0; color: var(--muted); }

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 20px 22px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.card h2 {
  font-family: Bangers, Impact, sans-serif;
  letter-spacing: 1.5px;
  font-weight: normal;
  font-size: 1.8rem;
  margin: 0 0 14px;
  color: var(--accent);
}
.card h3 { margin: 0 0 8px; font-size: 0.95rem; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}
.row input, .row select { flex: 1; min-width: 120px; }

input, select, button {
  font: inherit;
  padding: 10px 12px;
  border-radius: 10px;
}
input, select {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--card-border);
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--blue); outline-offset: 1px; }

button {
  background: linear-gradient(135deg, var(--blue), #6366f1);
  color: white;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, filter 0.15s;
}
button:hover { filter: brightness(1.15); }
button:active { transform: scale(0.97); }
button.danger { background: linear-gradient(135deg, var(--accent-2), #be123c); margin-top: 10px; }
button.secondary { background: rgba(148, 163, 184, 0.2); }
button.small {
  padding: 4px 10px;
  font-size: 0.8rem;
  background: rgba(148, 163, 184, 0.18);
  color: var(--text);
}

.hint { margin: 4px 0 8px; color: var(--muted); font-size: 0.9rem; }

/* ---------- Avatars ---------- */

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid rgba(255, 255, 255, 0.85);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  background: #334155;
}
.avatar.initial {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: Bangers, Impact, sans-serif;
  font-size: 1.3rem;
  color: white;
}
.avatar.large { width: 80px; height: 80px; font-size: 2.4rem; }
.avatar.tiny { width: 26px; height: 26px; font-size: 0.9rem; border-width: 1.5px; }

.avatar-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}
.avatar-option {
  padding: 0;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: transparent;
  border: 3px solid transparent;
  overflow: hidden;
  transition: transform 0.15s, border-color 0.15s;
}
.avatar-option img { width: 100%; height: 100%; object-fit: cover; display: block; }
.avatar-option:hover { transform: scale(1.1); filter: none; }
.avatar-option.selected { border-color: var(--accent); box-shadow: 0 0 14px rgba(250, 204, 21, 0.7); }
.avatar-option.upload {
  border: 2px dashed var(--muted);
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.1;
}
.avatar-option.upload:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Friend cards ---------- */

.friend-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 14px;
}
.friend-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 10px 12px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid var(--card-border);
  transition: transform 0.15s, box-shadow 0.15s;
}
.friend-card:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4); }
.friend-card .avatar-button {
  padding: 0;
  background: none;
  border-radius: 50%;
  position: relative;
}
.friend-card .avatar-button::after {
  content: '✎';
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 24px;
  height: 24px;
  line-height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  font-size: 0.8rem;
  opacity: 0;
  transition: opacity 0.15s;
}
.friend-card:hover .avatar-button::after { opacity: 1; }
.friend-card .name { font-weight: 700; text-align: center; word-break: break-word; }
.friend-grid .empty { grid-column: 1 / -1; color: var(--muted); font-style: italic; }

/* ---------- Lists ---------- */

.list {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}
.list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--card-border);
}
.list li:last-child { border-bottom: none; }
.list li.empty { color: var(--muted); font-style: italic; }
.list li.archived { opacity: 0.45; }
.list li.archived .text { text-decoration: line-through; }
.list .text { flex: 1; }
.list .who { display: flex; align-items: center; gap: 8px; flex: 1; font-weight: 600; }
.arrow { color: var(--accent); font-weight: 700; }

.amount-pill {
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
  white-space: nowrap;
}
.positive { color: var(--green); background: rgba(74, 222, 128, 0.12); }
.negative { color: var(--red); background: rgba(248, 113, 113, 0.12); }
.settled { color: var(--muted); background: rgba(148, 163, 184, 0.12); }

.columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 640px) {
  .columns { grid-template-columns: 1fr; }
}

.list .details { display: block; margin-left: 34px; }

/* ---------- Shared bill split ---------- */

.split-panel {
  margin-bottom: 10px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid var(--card-border);
}
.split-panel[hidden] { display: none; }
.split-header { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; font-weight: 600; }
.split-list { list-style: none; padding: 0; margin: 0; }
.split-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--card-border);
}
.split-list li:last-child { border-bottom: none; }
.split-list li.excluded { opacity: 0.5; }
.split-list .who { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; cursor: pointer; }
.split-list input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); flex-shrink: 0; }
.split-list input[type="number"] { width: 90px; padding: 6px 8px; }
.split-list .suffix { width: 1.4em; color: var(--muted); font-size: 0.85rem; }
.split-list .share { min-width: 76px; text-align: center; }
.tag {
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  color: #000;
  background: var(--accent);
}
.split-status { margin: 8px 0 0; font-size: 0.9rem; }
.split-status.ok { color: var(--green); }
.split-status.problem { color: var(--red); }

.muted { color: var(--muted); font-size: 0.8rem; }
.error { color: var(--red); margin: 0; min-height: 1.2em; }

/* ---------- Dialog ---------- */

dialog {
  background: #1e293b;
  color: var(--text);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 22px;
  max-width: min(460px, calc(100vw - 32px));
}
dialog::backdrop { background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(3px); }
dialog h2 {
  font-family: Bangers, Impact, sans-serif;
  letter-spacing: 1.5px;
  font-weight: normal;
  color: var(--accent);
  margin: 0 0 14px;
}
.dialog-buttons { display: flex; justify-content: flex-end; gap: 10px; }