/* ── M&S Premium Brand Variables ────────────────────────── */
:root {
  --ms-dark-green: #004f32;
  --ms-mid-green: #1f6b4d;
  --ms-light-green: #f2f7f4;
  --ms-charcoal: #222222;
  --ms-muted: #666666;
  --ms-border: #e0e6e3;
  --ms-white: #ffffff;
  --radius: 8px;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ── Reset & Core Styles ────────────────────────────────── */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-stack);
  background-color: #f8faf9;
  color: var(--ms-charcoal);
  line-height: 1.5;
  padding-bottom: 120px; /* Space for the fixed bottom input dock */
}

.app-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
}

/* ── Header & Status ────────────────────────────────────── */
header {
  background: var(--ms-white);
  padding: 20px 16px;
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  margin-bottom: 20px;
  border-bottom: 3px solid var(--ms-dark-green);
}

h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--ms-dark-green);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

#status {
  font-size: 12px;
  color: var(--ms-muted);
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── Main Shopping List Layout ───────────────────────────── */
.aisle-group {
  background: var(--ms-white);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
  border: 1px solid var(--ms-border);
  overflow: hidden;
}

.aisle-label {
  background: var(--ms-light-green);
  color: var(--ms-dark-green);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 10px 16px;
  border-bottom: 1px solid var(--ms-border);
}

/* ── List Items (Mobile Tapping Optimised) ───────────────── */
.item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--ms-border);
  transition: background-color 0.2s ease;
}

.item:last-child {
  border-bottom: none;
}

/* Custom Checkbox Design */
.checkbox-container {
  display: flex;
  align-items: center;
  cursor: pointer;
  position: relative;
}

.item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.custom-checkmark {
  height: 24px;
  width: 24px;
  background-color: var(--ms-white);
  border: 2px solid var(--ms-dark-green);
  border-radius: 6px;
  display: inline-block;
  position: relative;
  transition: all 0.2s ease;
}

.item input[type="checkbox"]:checked ~ .custom-checkmark {
  background-color: var(--ms-dark-green);
}

.custom-checkmark:after {
  content: "";
  position: absolute;
  display: none;
  left: 7px;
  top: 3px;
  width: 6px;
  height: 12px;
  border: solid var(--ms-white);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

.item input[type="checkbox"]:checked ~ .custom-checkmark:after {
  display: block;
}

/* Item text */
.item-name {
  flex: 1;
  font-size: 16px;
  color: var(--ms-charcoal);
  transition: all 0.2s ease;
  user-select: none;
}

.item-name.checked {
  text-decoration: line-through;
  color: #999999;
}

/* Accessible Delete Button */
.delete-btn {
  background: none;
  border: none;
  color: #bbbbbb;
  font-size: 22px;
  cursor: pointer;
  padding: 8px;
  margin: -8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease;
}

.delete-btn:hover, .delete-btn:active {
  color: #c93b3b;
}

/* ── Fixed Bottom Form Dock ─────────────────────────────── */
.form-dock {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ms-white);
  box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  z-index: 100;
  border-top: 1px solid var(--ms-border);
}

.form-dock-inner {
  max-width: 568px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-row {
  display: flex;
  gap: 8px;
  width: 100%;
}

#item-input {
  flex: 1;
  padding: 12px;
  font-size: 16px;
  border: 1px solid var(--ms-border);
  border-radius: var(--radius);
  outline: none;
  background: #fafafa;
  color: var(--ms-charcoal);
}

#item-input:focus {
  border-color: var(--ms-dark-green);
  background: var(--ms-white);
  box-shadow: 0 0 0 3px rgba(0, 79, 50, 0.15);
}

#aisle-select {
  flex: 1;
  padding: 12px;
  font-size: 14px;
  border: 1px solid var(--ms-border);
  border-radius: var(--radius);
  background-color: #fafafa;
  outline: none;
  color: var(--ms-charcoal);
}

#add-btn {
  background-color: var(--ms-dark-green);
  color: var(--ms-white);
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s;
}

#add-btn:active {
  background-color: var(--ms-mid-green);
}

/* ── States & Placeholders ──────────────────────────────── */
#loading, .no-items {
  text-align: center;
  padding: 40px 20px;
  color: var(--ms-muted);
  font-size: 15px;
}

.error {
  color: #c93b3b;
  font-weight: 600;
}