/* Khoảng cách theo bội số 4/8px; màu chỉ định nghĩa ở :root. */
:root {
  --color-bg: #f4f6f9;
  --color-surface: #ffffff;
  --color-text: #1f2933;
  --color-muted: #616e7c;
  --color-border: #d9e2ec;
  --color-primary: #06c755;
  --color-primary-text: #ffffff;
  --color-accent: #1f6feb;
  --color-danger: #c62828;
  --color-danger-bg: #fdecea;
  --color-success-bg: #e6f6ec;
  --color-chip-active: #e3f2fd;
  --color-overlay: rgba(15, 23, 42, 0.55);
  --radius: 12px;
  --tap: 48px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1419;
    --color-surface: #1b222b;
    --color-text: #e6edf3;
    --color-muted: #9aa7b4;
    --color-border: #2d3742;
    --color-chip-active: #12324d;
    --color-danger: #ff8a80;
    --color-danger-bg: #3b1d1d;
    --color-success-bg: #163222;
    --color-accent: #58a6ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

button, input, select, textarea { font: inherit; color: inherit; }

.screen { padding: 16px; display: flex; flex-direction: column; gap: 16px; max-width: 640px; margin: 0 auto; }
.screen--center { min-height: 100vh; justify-content: center; }
.screen--with-footer { padding-bottom: 200px; }

.header {
  position: sticky; top: 0; z-index: 2;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; min-height: 56px;
  background: var(--color-surface); border-bottom: 1px solid var(--color-border);
}
.header__title { font-size: 16px; margin: 0; }
.header__back { min-height: var(--tap); padding: 0 8px; border: 0; background: none; color: var(--color-accent); }

.home__header { padding: 8px 0; }
.home__company { margin: 0; color: var(--color-muted); font-size: 14px; }
.home__title { margin: 4px 0 0; font-size: 28px; }

.card {
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius);
  padding: 16px; display: flex; flex-direction: column; gap: 12px;
}
.section-head { display: flex; justify-content: space-between; align-items: baseline; }
.section-title { margin: 0; font-size: 16px; }
.category { margin: 8px 0 0; font-size: 14px; color: var(--color-muted); }
.muted { color: var(--color-muted); font-size: 14px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  min-height: var(--tap); padding: 0 16px; border-radius: 999px;
  border: 1px solid var(--color-border); background: var(--color-surface);
}
.chip--active { background: var(--color-chip-active); border-color: var(--color-accent); font-weight: 600; }

.action-card {
  display: flex; flex-direction: column; gap: 4px; text-align: left;
  padding: 24px 16px; border-radius: var(--radius);
  border: 1px solid var(--color-border); background: var(--color-surface);
}
.action-card__title { font-size: 20px; font-weight: 700; }
.action-card__hint { font-size: 14px; color: var(--color-muted); }

.field { display: flex; flex-direction: column; gap: 4px; }
.field__label { font-size: 14px; font-weight: 600; }
.badge { font-size: 12px; color: var(--color-danger); font-weight: 400; }
.input {
  width: 100%; min-height: var(--tap); padding: 8px 12px;
  border: 1px solid var(--color-border); border-radius: 8px; background: var(--color-surface);
}
.input--small { min-height: 40px; font-size: 14px; }
.input--amount { max-width: 140px; }
.textarea { min-height: 120px; resize: vertical; }

.button-row { display: flex; flex-wrap: wrap; gap: 8px; }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--tap); padding: 0 16px; border-radius: 8px; border: 1px solid transparent;
  font-weight: 600; cursor: pointer;
}
.button--primary { background: var(--color-primary); color: var(--color-primary-text); }
.button--secondary { background: var(--color-surface); border-color: var(--color-accent); color: var(--color-accent); }
.button--ghost { background: none; color: var(--color-accent); }
.button--block { width: 100%; }
.button:disabled, .button.is-disabled { opacity: 0.4; pointer-events: none; }

.photos { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.photo { position: relative; display: flex; flex-direction: column; gap: 4px; }
.photo__img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 8px; background: var(--color-border); }
.photo__remove {
  position: absolute; top: 4px; right: 4px; width: 32px; height: 32px;
  border-radius: 50%; border: 0; background: var(--color-overlay); color: #fff; font-size: 20px; line-height: 1;
}

.item { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 0;
        border-bottom: 1px solid var(--color-border); }
.item__info { display: flex; flex-direction: column; min-width: 0; }
.item__name { font-weight: 600; }
.stepper { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.stepper__button {
  width: 44px; height: 44px; border-radius: 8px; border: 1px solid var(--color-border);
  background: var(--color-surface); font-size: 20px;
}
.stepper__input {
  width: 64px; height: 44px; text-align: center; border: 1px solid var(--color-border);
  border-radius: 8px; background: var(--color-surface);
}

.extras { display: flex; flex-direction: column; gap: 8px; }
.extra { display: flex; align-items: center; gap: 8px; }
.extra__label { flex: 1; font-weight: 600; }
.extra--discount .extra__label { color: var(--color-danger); }
.icon-button { width: 44px; height: 44px; flex-shrink: 0; border: 0; background: none; font-size: 20px; color: var(--color-muted); }

.footer {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: var(--color-surface); border-top: 1px solid var(--color-border);
}
.totals { margin: 0 0 8px; display: grid; gap: 4px; max-width: 640px; margin-left: auto; margin-right: auto; }
.totals div { display: flex; justify-content: space-between; }
.totals dt, .totals dd { margin: 0; }
.totals__total { font-size: 20px; font-weight: 700; }
.footer .button--block { max-width: 640px; display: flex; margin: 0 auto; }

.banner { border-radius: 8px; padding: 12px 16px; margin: 0; }
.banner p { margin: 4px 0 0; }
.banner ul { margin: 8px 0 0; padding-left: 20px; }
.banner--error { background: var(--color-danger-bg); color: var(--color-danger); }
.banner--success { background: var(--color-success-bg); }

.message, .result, .empty { text-align: center; display: flex; flex-direction: column; gap: 12px; align-items: stretch; }
.message__title { font-size: 20px; margin: 0; }
.message__body { color: var(--color-muted); margin: 0; }
.result__check {
  width: 64px; height: 64px; margin: 0 auto; border-radius: 50%;
  background: var(--color-primary); color: var(--color-primary-text);
  display: flex; align-items: center; justify-content: center; font-size: 32px;
}
.result__title { font-size: 20px; margin: 0; }
.result__id { margin: 0; color: var(--color-muted); }
.result__total { margin: 0; font-size: 28px; font-weight: 700; }
.empty { padding: 32px 16px; }

.overlay {
  position: fixed; inset: 0; z-index: 10; background: var(--color-overlay);
  display: flex; align-items: center; justify-content: center;
}
.overlay[hidden] { display: none; }
.overlay__box {
  background: var(--color-surface); border-radius: var(--radius); padding: 24px;
  display: flex; flex-direction: column; align-items: center; gap: 12px; min-width: 240px;
}
.overlay__box p { margin: 0; }
.spinner {
  width: 32px; height: 32px; border-radius: 50%;
  border: 4px solid var(--color-border); border-top-color: var(--color-primary);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }