/* app.css — desktop-first (built for Mac). Lighthouse / precision-instrument. */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.55;
  color: var(--fog-100);
  background: var(--ink-900);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow: hidden;            /* the screen scrolls, not the body */
  letter-spacing: -0.005em;
}

/* ---- ambient layers ----------------------------------------------------- */
/* warm beacon glow + vignette */
body::before {
  content: ''; position: fixed; inset: 0; z-index: -3; pointer-events: none;
  background:
    radial-gradient(900px 680px at 84% -8%, var(--amber-dim), transparent 58%),
    radial-gradient(760px 600px at -8% 108%, var(--patina-dim), transparent 52%),
    radial-gradient(140% 120% at 50% 0%, transparent 60%, rgba(0,0,0,0.45) 100%);
}
/* film grain */
body::after {
  content: ''; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  opacity: 0.05; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
[data-theme='light'] body::after { mix-blend-mode: multiply; opacity: 0.04; }

/* rotating lighthouse sweep + faint instrument grid */
.beam { position: fixed; inset: 0; z-index: -2; pointer-events: none; overflow: hidden; }
.beam::before {
  content: ''; position: absolute; top: -42vmax; right: -30vmax;
  width: 92vmax; height: 92vmax; border-radius: 50%;
  background: conic-gradient(from 140deg, transparent 0 40deg, var(--amber-glow) 53deg, transparent 66deg 360deg);
  filter: blur(46px); opacity: 0.16;
  transform-origin: center; will-change: transform;
  animation: sweep 30s linear infinite;
}
.beam::after {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(var(--hairline-soft) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: radial-gradient(circle at 50% 36%, #000, transparent 78%);
  mask-image: radial-gradient(circle at 50% 36%, #000, transparent 78%);
  opacity: 0.55;
}
@keyframes sweep { to { transform: rotate(360deg); } }

button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 8px; }
kbd {
  font-family: var(--font-mono); font-size: 11px; line-height: 1;
  padding: 3px 5px; border-radius: 6px;
  background: var(--ink-600); color: var(--fog-500); border: 1px solid var(--hairline);
}
::selection { background: var(--amber); color: #241405; }
.screen::-webkit-scrollbar { width: 11px; }
.screen::-webkit-scrollbar-thumb { background: var(--ink-600); border-radius: 11px; border: 3px solid transparent; background-clip: content-box; }
.screen::-webkit-scrollbar-thumb:hover { background: var(--fog-700); background-clip: content-box; }

/* ---- boot --------------------------------------------------------------- */
.boot { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; background: var(--ink-900); transition: opacity var(--dur-3) var(--ease-out); }
.boot.is-gone { opacity: 0; pointer-events: none; }
.boot__dot { width: 16px; height: 16px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 40px var(--amber-glow); animation: ditdah 1.1s var(--ease-in-out) infinite; }
@keyframes ditdah { 0%, 100% { transform: scale(0.6); opacity: 0.4; } 50% { transform: scale(1.18); opacity: 1; } }

/* ---- layout ------------------------------------------------------------- */
.app { display: grid; grid-template-columns: 264px 1fr; height: 100vh; height: 100dvh; }
.screen { overflow-y: auto; padding: clamp(1.6rem, 1rem + 2.6vw, 3.6rem); scroll-behavior: smooth; }
.wrap { max-width: var(--maxw); margin-inline: auto; }

/* ---- rail --------------------------------------------------------------- */
.rail {
  position: relative; display: flex; flex-direction: column; gap: var(--sp-5);
  padding: var(--sp-6) var(--sp-4);
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(1.3); -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-right: 1px solid var(--hairline);
}
.rail::after { content: ''; position: absolute; top: 0; right: 0; bottom: 0; width: 1px; background: linear-gradient(180deg, transparent, var(--amber-line), transparent); opacity: 0.5; }
.brand { display: flex; align-items: center; gap: 11px; padding: 0 10px; }
.brand__name { font-family: var(--font-display); font-weight: 700; font-size: 1.5rem; letter-spacing: -0.02em; }
.brand__beacon {
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--amber-line);
  background: radial-gradient(circle at 50% 38%, var(--amber-dim), transparent 70%);
}
.brand__beacon i { width: 10px; height: 10px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 16px var(--amber-glow); animation: breath 3s var(--ease-in-out) infinite; }
@keyframes breath { 0%, 100% { transform: scale(0.72); opacity: 0.6; } 50% { transform: scale(1); opacity: 1; } }

.nav { display: flex; flex-direction: column; gap: 4px; margin-top: var(--sp-3); }
.nav__item {
  position: relative; display: flex; align-items: center; gap: 13px;
  padding: 12px 13px; border-radius: var(--radius-m);
  color: var(--fog-300); font-weight: 500; font-size: 1.02rem; letter-spacing: -0.01em;
  transition: background var(--dur-1) var(--ease-out), color var(--dur-1), transform var(--dur-1);
}
.nav__item svg { width: 21px; height: 21px; flex: none; opacity: 0.85; transition: opacity var(--dur-1); }
.nav__item span { flex: 1; }
.nav__item kbd { opacity: 0; transition: opacity var(--dur-1); }
.nav__item:hover { background: var(--ink-700); color: var(--fog-100); }
.nav__item:hover svg { opacity: 1; }
.nav__item:hover kbd { opacity: 1; }
.nav__item.is-active { color: var(--amber); background: linear-gradient(100deg, var(--amber-dim), transparent 90%); }
.nav__item.is-active svg { opacity: 1; }
.nav__item.is-active::before {
  content: ''; position: absolute; left: -4px; top: 50%; translate: 0 -50%;
  width: 3px; height: 22px; border-radius: 3px; background: var(--amber);
  box-shadow: 0 0 12px var(--amber-glow);
}

.rail__foot { margin-top: auto; display: flex; align-items: center; gap: var(--sp-2); padding: 0 6px; }

/* ---- chips / icon btn --------------------------------------------------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 13px; border-radius: var(--radius-pill);
  background: var(--ink-700); border: 1px solid var(--hairline); box-shadow: var(--inner-hi);
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--fog-300);
  transition: border-color var(--dur-1), color var(--dur-1), transform var(--dur-1);
}
.chip--streak { color: var(--amber); }
.chip:hover { border-color: var(--amber-line); transform: translateY(-1px); }
.icon-btn { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; color: var(--fog-300); border: 1px solid transparent; transition: background var(--dur-1), color var(--dur-1), border-color var(--dur-1); }
.icon-btn:hover { background: var(--ink-700); color: var(--fog-100); border-color: var(--hairline); }
.ic-sun { display: none; }
[data-theme='light'] .ic-sun { display: block; }
[data-theme='light'] .ic-moon { display: none; }

/* ---- buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 22px; border-radius: var(--radius-m);
  font-family: var(--font-sans); font-weight: 700; letter-spacing: -0.01em;
  color: #241405; border: 1px solid transparent;
  background: linear-gradient(180deg, var(--amber-bright), var(--amber));
  box-shadow: var(--inner-hi), 0 10px 24px -12px var(--amber-glow), 0 2px 5px rgba(0,0,0,0.28);
  transition: transform var(--dur-1) var(--ease-out), filter var(--dur-1), box-shadow var(--dur-1);
}
.btn:hover { filter: brightness(1.05); transform: translateY(-1px); box-shadow: var(--inner-hi), 0 16px 32px -14px var(--amber-glow), 0 3px 7px rgba(0,0,0,0.3); }
.btn:active { transform: translateY(1px) scale(0.99); }
.btn--ghost { background: var(--ink-700); color: var(--fog-100); border-color: var(--hairline); box-shadow: var(--inner-hi); }
.btn--ghost:hover { background: var(--ink-600); border-color: var(--amber-line); filter: none; transform: translateY(-1px); }
.btn--danger { background: transparent; color: var(--danger); border-color: var(--hairline); box-shadow: none; }
.btn--danger:hover { background: var(--danger-dim); box-shadow: none; }
.btn--lg { padding: 16px 30px; font-size: var(--step-1); }
.btn--block { width: 100%; }
.btn[disabled] { opacity: 0.4; pointer-events: none; }
.btn kbd { background: rgba(0,0,0,0.18); color: inherit; border-color: rgba(0,0,0,0.2); }
.btn--ghost kbd, .btn--danger kbd { background: var(--ink-600); color: var(--fog-500); border-color: var(--hairline); }

/* ---- mode shell --------------------------------------------------------- */
.mode { max-width: 1080px; animation: rise var(--dur-3) var(--ease-out) both; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.mode__head { margin-bottom: var(--sp-6); }
.eyebrow { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.2em; text-transform: uppercase; color: var(--amber); display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.eyebrow::before { content: ''; width: 26px; height: 1px; background: linear-gradient(90deg, var(--amber), transparent); }
.mode__title { font-family: var(--font-display); font-size: var(--step-3); font-weight: 700; letter-spacing: -0.02em; line-height: 1; }
.mode__sub { color: var(--fog-300); margin-top: 14px; max-width: 56ch; font-size: 1.05rem; }

.panel {
  position: relative; background: var(--surface-grad), linear-gradient(180deg, var(--ink-800), var(--ink-850));
  border: 1px solid var(--hairline); border-radius: var(--radius-xl);
  padding: clamp(1.4rem, 1rem + 1.6vw, 2.4rem);
  box-shadow: var(--inner-hi), var(--shadow-2);
}
.row { display: flex; gap: var(--sp-3); flex-wrap: wrap; align-items: center; }
.spread { display: flex; justify-content: space-between; align-items: center; gap: var(--sp-4); flex-wrap: wrap; }

/* ---- the lamp (beacon lens) --------------------------------------------- */
.lamp-wrap { position: relative; display: grid; place-items: center; gap: var(--sp-5); padding: var(--sp-5) 0 var(--sp-4); }
.lamp-wrap::before { content: ''; position: absolute; left: 50%; top: 42%; translate: -50% -50%; width: min(640px, 98%); height: 380px; border-radius: 50%; background: radial-gradient(ellipse at center, var(--amber-dim), transparent 70%); filter: blur(24px); opacity: 0.5; pointer-events: none; z-index: 0; transition: opacity var(--dur-3) var(--ease-out); }
.lamp-wrap:has(.lamp.is-on)::before { opacity: 1; }
.lamp-wrap > * { position: relative; z-index: 1; }
.lamp {
  --d: clamp(172px, 27vw, 252px);
  width: var(--d); height: var(--d); border-radius: 50%; position: relative; display: grid; place-items: center; isolation: isolate;
  background: radial-gradient(ellipse 58% 42% at 38% 26%, rgba(255,245,225,0.10), transparent 60%), radial-gradient(circle at 50% 64%, var(--amber-dim), transparent 52%), radial-gradient(circle at 50% 44%, var(--ink-750), var(--ink-900) 74%);
  border: 1px solid var(--hairline);
  box-shadow: var(--inner-hi), inset 0 -12px 34px rgba(0,0,0,0.55), 0 34px 70px -34px rgba(0,0,0,0.8);
  transition: background var(--dur-2) var(--ease-out), border-color var(--dur-2), box-shadow var(--dur-2), transform var(--dur-2);
}
.lamp::before {
  content: ''; position: absolute; inset: 0; border-radius: 50%; z-index: 2; pointer-events: none; padding: 1.5px;
  background: conic-gradient(from 210deg, var(--amber-deep), var(--amber-bright) 18%, var(--amber-deep) 38%, rgba(0,0,0,0) 55%, var(--amber-deep) 92%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0.55; will-change: transform; animation: rimSpin 22s linear infinite;
}
@keyframes rimSpin { to { transform: rotate(360deg); } }
.lamp::after { content: ''; position: absolute; inset: 10%; border-radius: 50%; z-index: 1; pointer-events: none; background: repeating-radial-gradient(circle at 50% 46%, transparent 0 7px, var(--hairline-soft) 7px 8px); opacity: 0.6; }
.lamp__glyph { position: relative; z-index: 3; font-family: var(--font-mono); font-weight: 700; font-size: clamp(2.6rem, 9vw, 4.4rem); color: var(--fog-100); letter-spacing: 0.04em; transition: color var(--dur-1); }
.lamp.is-on {
  background: radial-gradient(ellipse 60% 42% at 40% 24%, rgba(255,250,236,0.6), transparent 54%), radial-gradient(circle at 50% 46%, var(--amber-bright), var(--amber) 58%, var(--amber-deep) 100%);
  border-color: var(--amber-bright); transform: scale(1.015);
  box-shadow: inset 0 2px 12px rgba(255,255,255,0.5), inset 0 -14px 32px rgba(150,80,20,0.5), 0 0 0 5px var(--amber-dim), 0 0 150px 16px var(--amber-glow), 0 0 70px 2px var(--amber-glow);
}
.lamp.is-on .lamp__glyph { color: #2a1606; }
.lamp.is-on::after { opacity: 0.22; }
.lamp.is-on::before { opacity: 0.9; }

.pips { display: flex; gap: 11px; height: 22px; align-items: center; }
.pip { background: var(--fog-500); border-radius: var(--radius-pill); height: 13px; }
.pip--dit { width: 13px; }
.pip--dah { width: 38px; }

/* ---- learn / read prompt + answer --------------------------------------- */
.prompt { text-align: center; }
.prompt__hint { color: var(--fog-500); font-size: var(--step--1); margin-top: 8px; }
.answer {
  width: 100%; max-width: 380px; margin: var(--sp-4) auto 0; text-align: center;
  font-family: var(--font-mono); font-size: clamp(2rem, 7vw, 3.1rem); text-transform: uppercase;
  letter-spacing: 0.32em; padding: 14px 0 14px 0.32em; background: transparent; border: none;
  border-bottom: 2px solid var(--hairline-strong); color: var(--fog-100); caret-color: var(--amber);
  transition: border-color var(--dur-1), color var(--dur-1);
}
.answer:focus { outline: none; border-color: var(--amber); }
.answer.is-ok { border-color: var(--patina); color: var(--patina); }
.answer.is-bad { border-color: var(--danger); color: var(--danger); animation: shake 0.32s; }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-8px); } 75% { transform: translateX(8px); } }
.verdict { min-height: 30px; margin-top: 6px; font-family: var(--font-mono); font-size: var(--step--1); color: var(--fog-500); text-align: center; }
.verdict b { color: var(--fog-100); }

/* ---- meters ------------------------------------------------------------- */
.meters { display: flex; gap: var(--sp-4); flex-wrap: wrap; }
.meter {
  flex: 1; min-width: 150px; position: relative; overflow: hidden;
  background: var(--surface-grad), linear-gradient(180deg, var(--ink-800), var(--ink-850));
  border: 1px solid var(--hairline); border-radius: var(--radius-l); padding: 18px 20px;
  box-shadow: var(--inner-hi); transition: transform var(--dur-2) var(--ease-out), border-color var(--dur-2);
  animation: rise var(--dur-3) var(--ease-out) both;
}
.meter:hover { transform: translateY(-3px); border-color: var(--amber-line); }
.meter:nth-child(2) { animation-delay: 0.06s; }
.meter:nth-child(3) { animation-delay: 0.12s; }
.meter__k { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fog-500); }
.meter__v { font-family: var(--font-display); font-size: var(--step-2); font-weight: 600; letter-spacing: -0.02em; margin-top: 4px; line-height: 1.05; }
.meter__v small { font-family: var(--font-sans); font-size: var(--step--1); color: var(--fog-500); font-weight: 500; }
.bar { height: 7px; border-radius: 4px; background: var(--ink-600); overflow: hidden; margin-top: 12px; box-shadow: inset 0 1px 2px rgba(0,0,0,0.4); }
.bar > i { display: block; height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--amber-deep), var(--amber-bright)); box-shadow: 0 0 12px var(--amber-glow); transition: width var(--dur-3) var(--ease-out); }

.chips-line { display: flex; flex-wrap: wrap; gap: 8px; }
.tagchip { font-family: var(--font-mono); font-size: var(--step--1); padding: 6px 12px; border-radius: var(--radius-pill); background: var(--ink-700); border: 1px solid var(--hairline); color: var(--fog-300); box-shadow: var(--inner-hi); }
.tagchip b { color: var(--amber); font-weight: 700; }

/* ---- segmented ---------------------------------------------------------- */
.seg { display: inline-flex; padding: 5px; background: var(--ink-700); border: 1px solid var(--hairline); border-radius: var(--radius-pill); box-shadow: var(--inner-hi); }
.seg button { padding: 9px 18px; border-radius: var(--radius-pill); color: var(--fog-300); font-weight: 600; font-size: var(--step--1); transition: color var(--dur-1); }
.seg button.is-active { background: linear-gradient(180deg, var(--amber-bright), var(--amber)); color: #241405; box-shadow: 0 6px 16px -10px var(--amber-glow); }

/* ---- reference grid ----------------------------------------------------- */
.grid { display: grid; gap: 13px; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
.cell {
  position: relative; overflow: hidden; text-align: left; padding: 15px;
  background: var(--surface-grad), linear-gradient(180deg, var(--ink-800), var(--ink-850));
  border: 1px solid var(--hairline); border-radius: var(--radius-m); box-shadow: var(--inner-hi);
  transition: transform var(--dur-1) var(--ease-out), border-color var(--dur-1), background var(--dur-1), box-shadow var(--dur-1);
}
.cell:hover { transform: translateY(-4px); border-color: var(--amber-line); box-shadow: var(--inner-hi), 0 18px 34px -22px var(--amber-glow); }
.cell.is-playing { border-color: var(--amber); box-shadow: var(--inner-hi), 0 0 30px -8px var(--amber-glow); }
.cell.is-playing::before { content: ''; position: absolute; inset: 0; background: var(--amber-dim); pointer-events: none; }
.cell__char { font-family: var(--font-display); font-size: var(--step-2); font-weight: 600; letter-spacing: -0.02em; }
.cell__code { font-family: var(--font-mono); color: var(--amber); font-size: var(--step-0); letter-spacing: 0.14em; margin-top: 3px; position: relative; }
.cell__rhythm { font-family: var(--font-mono); font-size: 11px; color: var(--fog-500); margin-top: 7px; position: relative; }
.section-label { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.16em; text-transform: uppercase; color: var(--fog-500); margin: var(--sp-6) 0 var(--sp-3); }

/* ---- keyer -------------------------------------------------------------- */
.keypad {
  position: relative; min-height: 240px; border-radius: var(--radius-xl);
  border: 1.5px dashed var(--amber-line); background: radial-gradient(circle at 50% 40%, var(--amber-dim), transparent 70%), var(--ink-800);
  display: grid; place-items: center; text-align: center; user-select: none;
  box-shadow: var(--inner-hi), inset 0 0 60px -20px var(--amber-glow);
  transition: background var(--dur-1), border-color var(--dur-1), transform var(--dur-1), box-shadow var(--dur-1);
}
.keypad.is-down { background: linear-gradient(180deg, var(--amber-bright), var(--amber)); border-style: solid; border-color: var(--amber-bright); transform: scale(0.99); box-shadow: 0 0 60px -10px var(--amber-glow); }
.keypad.is-down .keypad__hint, .keypad.is-down .keypad__sub, .keypad.is-down .keypad__live { color: #241405; }
.keypad__hint { font-family: var(--font-display); font-size: var(--step-1); font-weight: 600; }
.keypad__sub { color: var(--fog-500); font-size: var(--step--1); margin-top: 9px; }
.keypad__live { font-family: var(--font-mono); font-size: clamp(2rem, 7vw, 3.3rem); color: var(--fog-100); min-height: 1.2em; letter-spacing: 0.12em; margin: 6px 0; }
.stream { min-height: 66px; font-family: var(--font-mono); font-size: var(--step-1); letter-spacing: 0.12em; padding: 18px 20px; border-radius: var(--radius-m); background: var(--ink-850); border: 1px solid var(--hairline); color: var(--fog-100); word-break: break-word; box-shadow: inset 0 2px 8px rgba(0,0,0,0.35); }
.stream .pending { color: var(--amber); }
.stream:empty::before { content: 'La tua trasmissione comparirà qui…'; color: var(--fog-700); }

/* ---- light / emergency -------------------------------------------------- */
.sos-btn {
  width: 100%; padding: 26px; border-radius: var(--radius-xl);
  background: radial-gradient(circle at 50% 35%, var(--danger-dim), transparent 75%), var(--ink-800);
  border: 1px solid var(--danger); color: var(--danger); font-size: var(--step-2); font-weight: 700; letter-spacing: 0.24em; font-family: var(--font-mono);
  box-shadow: var(--inner-hi); transition: transform var(--dur-1) var(--ease-out), background var(--dur-1), box-shadow var(--dur-1);
}
.sos-btn:hover { box-shadow: var(--inner-hi), 0 0 40px -10px var(--danger); transform: translateY(-1px); }
.sos-btn:active { transform: scale(0.99); }
.sos-btn.is-active { background: var(--danger); color: var(--ink-900); }

.flash { position: fixed; inset: 0; z-index: 90; background: #000; display: none; place-items: center; cursor: pointer; }
.flash.is-open { display: grid; }
.flash__surface { position: absolute; inset: 0; background: #000; transition: background 28ms linear; }
.flash__surface.on { background: #fff; }
.flash__bar { position: relative; z-index: 2; display: flex; gap: 14px; align-items: center; padding: 11px 18px; border-radius: var(--radius-pill); background: rgba(10,9,7,0.72); backdrop-filter: blur(12px); color: #fff; font-family: var(--font-mono); font-size: var(--step--1); margin-top: auto; margin-bottom: 30px; border: 1px solid rgba(255,255,255,0.12); }
.flash__bar button { color: #fff; text-decoration: underline; text-underline-offset: 3px; }
.field-inline { display: flex; gap: 11px; flex-wrap: wrap; }
.input { flex: 1; min-width: 200px; padding: 14px 17px; border-radius: var(--radius-m); background: var(--ink-850); border: 1px solid var(--hairline); color: var(--fog-100); font-family: var(--font-mono); letter-spacing: 0.04em; box-shadow: inset 0 2px 6px rgba(0,0,0,0.3); }
.input:focus { outline: none; border-color: var(--amber); }
.note { display: flex; gap: 11px; padding: 13px 15px; border-radius: var(--radius-m); background: var(--ink-800); border: 1px solid var(--hairline); color: var(--fog-300); font-size: var(--step--1); box-shadow: var(--inner-hi); }
.note svg { flex: none; color: var(--amber); margin-top: 1px; }

/* ---- settings sheet ----------------------------------------------------- */
.sheet { border: none; padding: 0; background: transparent; color: var(--fog-100); max-width: 480px; width: calc(100% - 2rem); border-radius: var(--radius-xl); margin: auto; }
.sheet::backdrop { background: rgba(5,4,3,0.66); backdrop-filter: blur(8px); }
.sheet[open] .sheet__inner { animation: pop var(--dur-2) var(--ease-spring); }
@keyframes pop { from { opacity: 0; transform: scale(0.96) translateY(10px); } to { opacity: 1; transform: none; } }
.sheet__inner { background: var(--surface-grad), linear-gradient(180deg, var(--ink-800), var(--ink-850)); border: 1px solid var(--hairline); border-radius: var(--radius-xl); padding: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-5); box-shadow: var(--inner-hi), var(--shadow-2); }
.sheet__head { display: flex; justify-content: space-between; align-items: center; }
.sheet__head h2 { font-family: var(--font-display); font-size: var(--step-1); font-weight: 600; }
.sheet__foot { color: var(--fog-500); font-size: var(--step--1); text-align: center; }
.field { display: flex; flex-direction: column; gap: 9px; }
.field__label { font-size: var(--step--1); color: var(--fog-300); display: flex; justify-content: space-between; }
.field__label em { font-style: normal; font-family: var(--font-mono); color: var(--amber); font-weight: 700; }
.field__hint { font-size: 12px; color: var(--fog-500); }

input[type='range'] { -webkit-appearance: none; appearance: none; height: 7px; border-radius: 4px; background: var(--ink-600); box-shadow: inset 0 1px 2px rgba(0,0,0,0.4); }
input[type='range']::-webkit-slider-thumb { -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%; background: radial-gradient(circle at 38% 30%, var(--amber-bright), var(--amber)); border: 3px solid var(--ink-800); cursor: pointer; box-shadow: 0 0 14px -2px var(--amber-glow); transition: transform var(--dur-1); }
input[type='range']::-webkit-slider-thumb:hover { transform: scale(1.14); }
input[type='range']::-moz-range-thumb { width: 17px; height: 17px; border-radius: 50%; background: var(--amber); border: none; }

.switch { display: flex; align-items: center; gap: 13px; cursor: pointer; font-size: var(--step--1); color: var(--fog-300); }
.switch input { position: absolute; opacity: 0; }
.switch__track { width: 46px; height: 27px; border-radius: var(--radius-pill); background: var(--ink-600); padding: 3px; transition: background var(--dur-1); flex: none; box-shadow: inset 0 1px 3px rgba(0,0,0,0.4); }
.switch__thumb { display: block; width: 21px; height: 21px; border-radius: 50%; background: var(--fog-300); transition: transform var(--dur-2) var(--ease-spring), background var(--dur-1); }
.switch input:checked + .switch__track { background: linear-gradient(180deg, var(--amber-bright), var(--amber)); }
.switch input:checked + .switch__track .switch__thumb { transform: translateX(19px); background: #241405; }

/* ---- toast -------------------------------------------------------------- */
.toast { position: fixed; left: 50%; bottom: 30px; translate: -50% 0; z-index: 80; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast__item { background: var(--ink-700); border: 1px solid var(--amber-line); color: var(--fog-100); padding: 12px 20px; border-radius: var(--radius-pill); box-shadow: var(--shadow-2), 0 0 30px -12px var(--amber-glow); font-size: var(--step--1); animation: toastIn var(--dur-2) var(--ease-out); }
@keyframes toastIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* ---- columns ------------------------------------------------------------ */
.cols { display: grid; gap: var(--sp-5); grid-template-columns: 1fr; }
@media (min-width: 760px) { .cols--2 { grid-template-columns: 1.15fr 0.85fr; align-items: start; } }

/* ---- responsive: phone => bottom nav ------------------------------------ */
@media (max-width: 820px) {
  body { overflow: auto; }
  .app { grid-template-columns: 1fr; height: auto; min-height: 100dvh; }
  .screen { padding-bottom: 104px; }
  .rail { position: fixed; bottom: 0; left: 0; right: 0; z-index: 50; flex-direction: row; align-items: center; gap: 4px; padding: 8px 10px calc(8px + env(safe-area-inset-bottom)); border-right: none; border-top: 1px solid var(--hairline); }
  .rail::after { display: none; }
  .brand { display: none; }
  .nav { flex-direction: row; flex: 1; justify-content: space-around; margin: 0; }
  .nav__item { flex-direction: column; gap: 4px; padding: 7px 8px; font-size: 11px; }
  .nav__item kbd { display: none; }
  .nav__item span { flex: none; }
  .nav__item.is-active { background: transparent; }
  .nav__item.is-active::before { left: 50%; top: -6px; translate: -50% 0; width: 22px; height: 3px; }
  .rail__foot { margin: 0; padding-right: 4px; }
  .rail__foot .chip--streak { display: none; }
}
@media (max-width: 420px) { .nav__item span { display: none; } }