:root {
  --bg: #f3f4f8; --card: #ffffff; --text: #1b1d24; --muted: #6b7080;
  --accent: #4f7cff; --ok: #1fbf75; --warn: #f5a623; --bad: #ff4d5e;
  --track: #e2e5ee; --shadow: 0 8px 30px rgba(0,0,0,.08);
}
[data-theme="dark"] {
  --bg: #0d0f14; --card: #161a22; --text: #e8eaf0; --muted: #8a90a2;
  --accent: #6b8cff; --track: #262b36; --shadow: 0 8px 30px rgba(0,0,0,.5);
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg); color: var(--text); transition: background .3s, color .3s;
}
header { display: flex; justify-content: space-between; align-items: center; padding: 16px 28px; }
h1 { margin: 0; font-size: 1.4rem; letter-spacing: 1px; }
h1 span { color: var(--accent); margin-left: 4px; }
h1 .sub { font-size: .75rem; font-weight: 400; color: var(--muted); margin-left: 8px; letter-spacing: 0; }
.seo { max-width: 1100px; margin: 0 auto 24px; width: calc(100% - 56px); line-height: 1.6; }
.seo h2 { font-size: 1.3rem; } .seo h3 { font-size: 1.05rem; margin: 18px 0 6px; }
.seo p, .seo li { color: var(--muted); } .seo strong { color: var(--text); }
.seo details { background: var(--bg); border-radius: 10px; padding: 10px 14px; margin-bottom: 8px; }
.seo summary { cursor: pointer; font-weight: 600; }
h2 { margin-top: 0; font-size: 1.1rem; }
main { display: grid; grid-template-columns: 1fr 320px; gap: 20px; padding: 0 28px 20px; max-width: 1100px; margin: auto; }
@media (max-width: 860px) { main { grid-template-columns: 1fr; } }
.card { background: var(--card); border-radius: 18px; padding: 22px; box-shadow: var(--shadow); }
.display { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.note-row { display: flex; align-items: center; gap: 20px; }
.note { font-size: 6rem; font-weight: 700; min-width: 170px; text-align: center; transition: color .2s; }
.note.ok { color: var(--ok); text-shadow: 0 0 24px color-mix(in srgb, var(--ok) 50%, transparent); }
.display.held .note, .display.held .cents, .display.held .freq, .display.held .direction { opacity: .6; transition: opacity .3s; }
.octave { font-size: 2rem; color: var(--muted); }
.freq { font-size: 1.3rem; font-variant-numeric: tabular-nums; }
.target { color: var(--muted); font-size: .9rem; }
canvas { width: 100%; max-width: 600px; }
#strobe, #history { border-radius: 10px; background: var(--track); }
.cents { font-size: 1.6rem; font-variant-numeric: tabular-nums; font-weight: 600; }
.level { width: 100%; max-width: 600px; height: 6px; background: var(--track); border-radius: 3px; overflow: hidden; }
#levelBar { height: 100%; width: 0; background: var(--accent); transition: width .08s; }
button { font: inherit; cursor: pointer; border: none; border-radius: 10px; }
.primary { background: var(--accent); color: #fff; padding: 12px 36px; font-size: 1.05rem; margin-top: 6px; }
.primary.on { background: var(--bad); }
.icon-btn { background: var(--card); color: var(--text); font-size: 1.3rem; padding: 8px 12px; box-shadow: var(--shadow); }
.settings label { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; font-size: .9rem; color: var(--muted); }
.settings label b { color: var(--text); }
.settings label.check { flex-direction: row; align-items: center; color: var(--text); }
select, input[type=number] {
  background: var(--bg); color: var(--text); border: 1px solid var(--track);
  border-radius: 8px; padding: 8px; font: inherit;
}
input[type=range] { accent-color: var(--accent); }
.stepper { display: flex; gap: 6px; }
.stepper input { flex: 1; text-align: center; }
.stepper button { background: var(--track); color: var(--text); width: 40px; font-size: 1.2rem; }
footer { text-align: center; color: var(--muted); font-size: .8rem; padding-bottom: 20px; }
input[type=text] { background: var(--bg); color: var(--text); border: 1px solid var(--track); border-radius: 8px; padding: 8px; font: inherit; }

/* Enstrüman seçimi */
.instrument-bar { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; width: 100%; }
.seg { display: flex; background: var(--track); border-radius: 12px; padding: 4px; }
.seg button { background: transparent; color: var(--muted); padding: 8px 14px; }
.seg button.active { background: var(--accent); color: #fff; }
.string-panel { width: 100%; max-width: 600px; }
.strings { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.string {
  position: relative; min-width: 62px; padding: 10px 8px; background: var(--track); color: var(--text);
  border: 2px solid transparent; display: flex; flex-direction: column; align-items: center; transition: all .15s;
}
.string small { color: var(--muted); font-size: .7rem; }
.string .sname { font-size: 1.15rem; font-weight: 700; }
.string.selected { border-color: var(--accent); }
.string.active { background: color-mix(in srgb, var(--accent) 25%, var(--track)); }
.string.tuned::after {
  content: "✓"; position: absolute; top: -8px; right: -6px; background: var(--ok); color: #fff;
  border-radius: 50%; width: 20px; height: 20px; font-size: .75rem; display: grid; place-items: center;
}
.string-opts { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; font-size: .85rem; flex-wrap: wrap; gap: 6px; }
.string-opts .check { display: flex; gap: 6px; align-items: center; }
.hint { color: var(--muted); font-size: .85rem; text-align: center; margin-top: 6px; }
.small-btn { background: var(--track); color: var(--text); padding: 6px 12px; font-size: .85rem; }
.course {
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 8px 10px 10px;
  border: 1px dashed var(--track); border-radius: 12px; transition: border-color .15s, background .15s;
}
.course.active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.course-title { font-size: .75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.course-strings { display: flex; gap: 6px; }
.course .string { min-width: 54px; }
.direction { min-height: 1.4em; font-weight: 600; color: var(--muted); }
.direction.up { color: var(--warn); } .direction.down { color: var(--bad); } .direction.ok { color: var(--ok); }

.header-btns { display: flex; gap: 8px; }
.karar-box { margin-bottom: 10px; }
.karar-title { text-align: center; font-size: .85rem; color: var(--muted); margin-bottom: 6px; }
.karar-title b { color: var(--accent); }
.karar-bar { display: flex; gap: 4px; overflow-x: auto; padding-bottom: 4px; justify-content: center; flex-wrap: wrap; }
.karar { background: var(--track); color: var(--text); padding: 6px 10px; font-size: .85rem; font-weight: 600; min-width: 42px; }
.karar.active { background: var(--accent); color: #fff; box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 60%, transparent); }
@media (max-width: 860px) {
  .karar-bar { flex-wrap: nowrap; justify-content: flex-start; scrollbar-width: none; }
  .karar { padding: 6px 8px; font-size: .8rem; flex: 0 0 auto; }
}
.settings-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.settings-head h2 { margin: 0; }
.mobile-only, .overlay { display: none; }

/* ---------- Mobil: sade görünüm, ayarlar alttan açılan panelde ---------- */
@media (max-width: 860px) {
  .mobile-only { display: inline-block; }
  header { padding: 10px 14px; }
  h1 { font-size: 1.15rem; }
  h1 .sub { display: none; }
  .icon-btn { font-size: 1.1rem; padding: 6px 10px; }
  main { padding: 0 8px 12px; gap: 12px; }
  .card { padding: 14px 10px; border-radius: 14px; }
  .display { gap: 6px; }
  .seo { width: calc(100% - 16px); padding: 16px; }

  /* Enstrüman / düzen seçimi */
  .instrument-bar select { flex: 1; min-width: 0; }
  .seg { width: 100%; } .seg button { flex: 1; padding: 8px; }

  /* Teller: 7 tel tek satıra sığsın */
  .strings { gap: 4px; flex-wrap: nowrap; }
  .course { padding: 4px 4px 6px; gap: 4px; }
  .course-title { font-size: .6rem; letter-spacing: 0; }
  .course-strings { gap: 3px; }
  .string, .course .string { min-width: 0; width: 42px; padding: 6px 2px; }
  .string small { font-size: .55rem; }
  .string .sname { font-size: .95rem; }
  .string-opts { font-size: .75rem; justify-content: center; }

  /* Ana gösterge daha büyük ve net */
  .note-row { gap: 12px; }
  .note { font-size: 4.5rem; min-width: 120px; }
  .octave { font-size: 1.5rem; } .freq { font-size: 1.1rem; }
  .cents { font-size: 1.4rem; }
  .direction { font-size: 1.05rem; }
  #history { display: none; }
  #strobe { height: 36px; }

  /* Başlat butonu her zaman parmak altında */
  .primary { position: sticky; bottom: 10px; width: 100%; padding: 14px; font-size: 1.1rem; z-index: 5;
             box-shadow: 0 6px 20px rgba(0,0,0,.35); }

  /* Ayarlar: alttan açılan panel */
  .settings {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 50; max-height: 80vh; overflow-y: auto;
    border-radius: 18px 18px 0 0; padding: 16px 18px 28px;
    transform: translateY(100%); transition: transform .28s ease;
  }
  body.settings-open .settings { transform: translateY(0); }
  .overlay { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 40;
             opacity: 0; pointer-events: none; transition: opacity .28s; }
  body.settings-open .overlay { opacity: 1; pointer-events: auto; }
  body.settings-open { overflow: hidden; }
}