:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel2: #1e222b;
  --line: #2a2f3a;
  --text: #e6e8ec;
  --muted: #9aa1ad;
  --accent: #f5b83d;
  --s: #4fb3ff;   /* shutter */
  --a: #ff7a59;   /* aperture */
  --i: #b48cff;   /* ISO */
  --ok: #51cf66;
  --warn: #ffb020;
  --bad: #ff5c5c;
  --gap: 8px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font: 13px/1.35 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
body { display: flex; flex-direction: column; }
button, select, input { font: inherit; color: inherit; }
kbd { background: var(--panel2); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; font-size: 11px; }

/* ---------- header ---------- */
.top { flex: 0 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 5px 12px; border-bottom: 1px solid var(--line); background: #12141a; }
.brand { display: flex; gap: 10px; align-items: baseline; min-width: 0; }
.logo { font-size: 18px; color: var(--accent); }
.brand h1 { font-size: 16px; margin: 0; white-space: nowrap; }
.tag { color: var(--muted); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-actions { display: flex; gap: 6px; }
.ghost { background: transparent; border: 1px solid var(--line); border-radius: 7px; padding: 3px 10px; cursor: pointer; font-size: 12px; }
.ghost:hover { border-color: var(--muted); }

/* ---------- one-screen layout ---------- */
.layout { flex: 1 1 auto; min-height: 0; display: grid; grid-template-columns: minmax(0, 1fr) 540px; grid-template-rows: minmax(0, 1fr); gap: var(--gap); padding: var(--gap); }
.viewer { display: flex; flex-direction: column; gap: var(--gap); min-width: 0; min-height: 0; }
.stage { flex: 1 1 0; min-height: 160px; display: flex; align-items: center; justify-content: center; }
.frame { position: relative; background: #000; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); cursor: crosshair; width: 100%; aspect-ratio: 3 / 2; }
.frame canvas { width: 100%; height: 100%; display: block; }
.frame-hint { position: absolute; right: 8px; bottom: 6px; font-size: 11px; color: #fff; background: rgba(0,0,0,.45); padding: 1px 7px; border-radius: 9px; pointer-events: none; opacity: .75; }
.frame-msg { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: 30px; background: #111; color: var(--bad); }
#flash { position: absolute; inset: 0; background: #000; opacity: 0; pointer-events: none; transition: opacity .25s; }
#flash.on { opacity: 1; transition: none; }
.af { position: absolute; width: 30px; height: 30px; margin: -15px 0 0 -15px; border: 2px solid #ff3b3b; border-radius: 3px; pointer-events: none; box-shadow: 0 0 0 1px rgba(0,0,0,.4); transition: border-color .3s; }
.af.locked { border-color: #46ff6e; }

/* camera LCD */
.lcd { flex: 0 0 auto; display: flex; gap: 4px 16px; align-items: center; background: #050607; border: 1px solid var(--line); border-radius: 8px; padding: 4px 12px; font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.lcd-item { display: flex; flex-direction: column; }
.lcd-k { font-size: 9px; letter-spacing: .08em; color: var(--muted); }
.lcd b { font-size: 16px; color: #fff; font-weight: 600; white-space: nowrap; }
#lcdShutter { color: var(--s); } #lcdAperture { color: var(--a); } #lcdIso { color: var(--i); }
.lcd-meter { flex: 1; min-width: 160px; }
.meter-scale { display: flex; justify-content: space-between; font-size: 10px; color: var(--muted); }
.meter-track { position: relative; height: 10px; margin-top: 1px; background: repeating-linear-gradient(90deg, #333 0 2px, transparent 2px calc(100% / 18)); border-bottom: 2px solid #555; }
.meter-track::after { content: ""; position: absolute; left: 50%; top: 0; bottom: -2px; width: 2px; background: #fff; transform: translateX(-1px); }
.meter-needle { position: absolute; top: -2px; width: 0; height: 0; border-left: 6px solid transparent; border-right: 6px solid transparent; border-top: 10px solid var(--accent); transform: translateX(-6px); transition: left .15s; }
.meter-needle.over { border-top-color: var(--bad); }
.meter-needle.out { animation: blink .6s steps(2) infinite; }
@keyframes blink { 50% { opacity: .2; } }

/* info panels under the photo */
.panels { flex: 0 0 clamp(170px, 21vh, 250px); display: grid; grid-template-columns: 1fr 1.25fr 1.45fr 1fr; gap: var(--gap); min-height: 0; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; min-width: 0; min-height: 0; display: flex; flex-direction: column; }
.card h3 { flex: 0 0 auto; margin: 0 0 4px; font-size: 10.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); display: flex; justify-content: space-between; gap: 6px; white-space: nowrap; }
.card h3 small { text-transform: none; letter-spacing: 0; font-weight: 400; overflow: hidden; text-overflow: ellipsis; }
.card canvas { flex: 1 1 auto; min-height: 0; width: 100%; display: block; background: #0b0c10; border-radius: 5px; }
.hint { color: var(--muted); font-size: 11.5px; margin: 2px 0 0; }
.lesson-body { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding-right: 2px; }
#lesson { font-size: 12.5px; }
#lesson p { margin: 0 0 4px; }
#lesson b.s { color: var(--s); } #lesson b.a { color: var(--a); } #lesson b.i { color: var(--i); }
#warnings { margin: 4px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 3px; }
#warnings li { font-size: 11.5px; padding: 2px 6px; border-radius: 5px; background: var(--panel2); border-left: 3px solid var(--muted); }
#warnings li.ok { border-color: var(--ok); }
#warnings li.warn { border-color: var(--warn); }
#warnings li.bad { border-color: var(--bad); }

.strip { flex: 1 1 auto; min-height: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; overflow-y: auto; align-content: start; }
.shot { position: relative; cursor: pointer; background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 3px; }
.shot:hover { border-color: var(--accent); }
.shot img { width: 100%; display: block; border-radius: 3px; }
.shot .cap { font: 10px/1.25 ui-monospace, Menlo, monospace; color: var(--text); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.shot .del { position: absolute; top: 5px; right: 5px; width: 18px; height: 18px; border-radius: 50%; border: 0; background: rgba(0,0,0,.65); color: #fff; cursor: pointer; line-height: 18px; padding: 0; font-size: 12px; }

/* ---------- settings: two columns ---------- */
.controls { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); min-height: 0; overflow-y: auto; align-content: start; }
.col { display: flex; flex-direction: column; gap: var(--gap); min-width: 0; }
.group { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px 8px; }
.group h2 { margin: 0 0 5px; font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); }
.desc { color: var(--muted); font-size: 11.5px; margin: 4px 0 0; }
.ctl { margin-top: 6px; }
.ctl label { display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: 12px; gap: 6px; }
.ctl label > span { display: inline-flex; align-items: center; white-space: nowrap; }
.ctl output { font-family: ui-monospace, Menlo, monospace; font-weight: 600; color: var(--text); background: var(--panel2); padding: 0 6px; border-radius: 5px; white-space: nowrap; font-size: 12px; }
.ctl input[type=range] { width: 100%; margin: 3px 0 0; accent-color: var(--accent); }
.ctl input[type=range]:disabled { opacity: .45; }
.ctl .row { display: flex; align-items: center; gap: 8px; }
.ctl .row input { flex: 1; }
#iris { width: 30px; height: 30px; flex: 0 0 30px; }
.scale { display: flex; justify-content: space-between; font-size: 10px; color: var(--muted); gap: 6px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 5px; }
.dot-s { background: var(--s); } .dot-a { background: var(--a); } .dot-i { background: var(--i); }
#shutter { accent-color: var(--s); } #aperture { accent-color: var(--a); } #iso { accent-color: var(--i); }
.auto-tag { font-size: 9px; font-weight: 700; color: #111; background: var(--accent); padding: 0 4px; border-radius: 3px; margin-left: 4px; vertical-align: 1px; }
.kelvin { accent-color: #fff !important; height: 7px; border-radius: 4px; -webkit-appearance: none; appearance: none; margin-top: 7px !important;
  background: linear-gradient(90deg, #ff9b3d, #ffd8a8 30%, #fff 45%, #cfe0ff 70%, #9cbcff); }
.tintbar { -webkit-appearance: none; appearance: none; height: 7px; border-radius: 4px; margin-top: 7px !important; background: linear-gradient(90deg, #6bd36b, #ddd 50%, #e070e0); }
.kelvin::-webkit-slider-thumb, .tintbar::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 2px solid #333; }

.chips { display: flex; flex-wrap: wrap; gap: 4px; }
.chips button { background: var(--panel2); border: 1px solid var(--line); border-radius: 14px; padding: 2px 8px; cursor: pointer; font-size: 12px; }
.chips button.on { border-color: var(--accent); background: #3a2f17; }
.chips.small { margin-top: 4px; }
.chips.small button { padding: 1px 6px; font-size: 11px; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.seg button { flex: 1; padding: 4px 2px; background: var(--panel2); border: 0; border-right: 1px solid var(--line); cursor: pointer; font-weight: 600; font-size: 12px; white-space: nowrap; }
.seg button:last-child { border-right: 0; }
.seg button.on { background: var(--accent); color: #111; }
select { width: 100%; background: var(--panel2); border: 1px solid var(--line); border-radius: 7px; padding: 3px 6px; font-size: 12px; }
.check { display: flex; align-items: center; gap: 6px; margin-top: 6px; font-size: 12px; cursor: pointer; }
.check input { margin: 0; }
.equiv { margin-top: 7px; font-size: 11px; color: var(--muted); }
.equiv .btns { display: flex; flex-wrap: wrap; gap: 3px; margin-top: 3px; }
.equiv button { background: var(--panel2); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; cursor: pointer; font: 10.5px ui-monospace, Menlo, monospace; }
.equiv button:hover { border-color: var(--accent); }
.equiv button.cur { border-color: var(--accent); color: var(--accent); }

.shoot { background: var(--accent); color: #111; border: 0; border-radius: 8px; padding: 10px; font-size: 15px; font-weight: 700; cursor: pointer; }
.shoot:active { transform: translateY(1px); }
.shoot.small { padding: 7px 16px; font-size: 13px; }

dialog { max-width: 760px; max-height: 90vh; background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 12px; padding: 8px 22px 18px; font-size: 14px; line-height: 1.45; }
dialog::backdrop { background: rgba(0,0,0,.6); }
dialog h3 { color: var(--accent); margin-bottom: 4px; }
dialog li { margin-bottom: 4px; }
.dlg-actions { text-align: right; margin-top: 10px; }

/* ---------- smaller screens: fall back to a scrolling, stacked layout ---------- */
@media (max-width: 1100px), (max-height: 600px) {
  html, body { height: auto; }
  .layout { grid-template-columns: 1fr; grid-template-rows: auto; }
  .stage { flex: none; }
  .panels { grid-template-columns: 1fr 1fr; flex-basis: auto; grid-auto-rows: 180px; }
  .controls { overflow: visible; }
}
@media (max-width: 640px) {
  .panels, .controls { grid-template-columns: 1fr; }
  .tag { display: none; }
}