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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 var(--font-ui);
  transition: background-color 0.25s ease, color 0.25s ease;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.2; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: clamp(30px, 5vw, 46px); }
h2 { font-size: 19px; }
p { margin: 0; }
a { color: var(--accent); }
.muted { color: var(--ink-3); }
.label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-2); margin: 14px 0 6px; }
.hint-text { font-size: 13px; color: var(--ink-3); margin-top: 10px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ───── шапка ───── */
.app-header {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 12px clamp(14px, 3vw, 32px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font: 600 20px var(--font-display); color: var(--ink); text-decoration: none; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px; background: var(--accent);
  mask: none; position: relative; overflow: hidden;
}
.brand-mark::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 120%, rgb(255 255 255 / 55%) 0 38%, transparent 40%),
              radial-gradient(circle at 80% 130%, rgb(255 255 255 / 35%) 0 40%, transparent 42%);
}
.header-tools { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.select { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--ink-2); }
.select-label { display: none; }
@media (min-width: 720px) { .select-label { display: inline; } }
select, input[type="text"] {
  font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 7px 10px;
}
input[type="text"] { width: 100%; }
select { padding-right: 6px; cursor: pointer; }

.conn { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-3); }
.conn-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-3); }
.conn-dot[data-state="open"] { background: var(--ok); }
.conn-dot[data-state="closed"] { background: var(--danger); }
.conn-dot[data-state="connecting"] { background: #d9a400; }

/* ───── кнопки и элементы форм ───── */
.btn {
  font: inherit; font-weight: 600; color: var(--ink); text-decoration: none; text-align: center;
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 8px 14px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
  transition: background-color 0.15s, border-color 0.15s, transform 0.1s;
}
.btn:hover:not(:disabled) { border-color: var(--ink-3); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.large { padding: 12px 20px; font-size: 16px; width: 100%; margin-top: 18px; }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn.icon { padding: 4px 0; flex: 1; font-size: 22px; line-height: 1; }

.segmented { display: inline-flex; padding: 3px; gap: 2px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; }
.segmented.wide { display: flex; }
.segmented.wide button { flex: 1; }
.segmented button {
  font: inherit; font-size: 13px; font-weight: 600; color: var(--ink-2); background: none; border: 0;
  border-radius: 7px; padding: 6px 12px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
  transition: background-color 0.15s, color 0.15s;
}
.segmented button:hover { color: var(--ink); }
.segmented button[aria-checked="true"] { background: var(--surface); color: var(--accent); box-shadow: 0 1px 2px rgb(0 0 0 / 14%); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }

/* ───── диалог и уведомления ───── */
.overlay { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; background: rgb(8 10 14 / 50%); animation: fade-in 0.15s ease; }
.dialog { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); animation: pop-in 0.18s ease; }
.dialog h3 { margin-bottom: 14px; }
.promo-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.promo-choice {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 10px 8px; font: inherit; font-size: 12px;
  color: var(--ink-2); background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); cursor: pointer;
}
.promo-choice:hover { border-color: var(--accent); color: var(--ink); }
.promo-choice .piece-icon { background: color-mix(in srgb, var(--sq-light) 70%, var(--surface)); border-radius: 8px; }

.toasts { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 30; display: grid; gap: 8px; justify-items: center; }
.toast { background: var(--ink); color: var(--bg); padding: 9px 16px; border-radius: 999px; font-size: 14px; box-shadow: var(--shadow); animation: pop-in 0.2s ease; transition: opacity 0.35s; }
.toast-out { opacity: 0; }

@keyframes fade-in { from { opacity: 0; } }
@keyframes pop-in { from { opacity: 0; transform: translateY(6px) scale(0.98); } }

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