/* ============================================================
   İnsan Dolaşım & Sinir Sistemi Simülasyonu — Tema Stilleri
   Koyu biyo-tema: kalp kırmızıları, damar renkleri, sinir sarısı.
   ============================================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --zemin: #0b0d12;
  --panel: rgba(15, 18, 26, 0.92);
  --kenar: #2a3347;
  --metin: #e6ecf5;
  --soluk: #93a0b8;
  --kan-kirmizi: #ff4757;
  --ven-koyu: #8d4a5a;
  --sinir-sari: #ffd32a;
  --doga: #26de81;
  --fokus: #54a0ff;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: 'Segoe UI', 'Trebuchet MS', Verdana, sans-serif;
  background: radial-gradient(circle at 50% 40%, #12161f 0%, var(--zemin) 75%);
  color: var(--metin);
}

#uygulama {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#tuval {
  display: block;
  width: min(1100px, 96vw);
  height: auto;
  max-height: 94vh;
  background: radial-gradient(circle at 50% 45%, #0e1118 0%, #07080c 100%);
  border-radius: 16px;
  box-shadow: 0 0 60px rgba(255, 71, 87, 0.08);
}

/* ---------- KONTROL PANELİ ---------- */
#kontrolPanel {
  position: absolute;
  left: 18px;
  top: 18px;
  width: 235px;
  background: var(--panel);
  border: 1px solid var(--kenar);
  border-radius: 14px;
  padding: 16px;
  backdrop-filter: blur(6px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.panelBaslik {
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 12px;
  letter-spacing: 0.4px;
  color: #fff;
}

.aktiviteBtn {
  display: block;
  width: 100%;
  margin: 7px 0;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--metin);
  background: #161b26;
  border: 1px solid var(--kenar);
  border-radius: 9px;
  cursor: pointer;
  text-align: left;
  transition: background 0.2s, border-color 0.2s, transform 0.05s;
}

.aktiviteBtn:hover {
  background: #1f2635;
  border-color: var(--fokus);
}

.aktiviteBtn:active {
  transform: scale(0.98);
}

.aktiviteBtn.aktif {
  background: linear-gradient(135deg, #3a1017, #6b1d2a);
  border-color: var(--kan-kirmizi);
  color: #fff;
  box-shadow: 0 0 14px rgba(255, 71, 87, 0.35);
}

.bilgiNotlar {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--kenar);
  font-size: 12px;
  color: var(--soluk);
  line-height: 1.5;
}

/* ---------- HUD ---------- */
#hud {
  position: absolute;
  right: 18px;
  top: 18px;
  width: 220px;
  background: var(--panel);
  border: 1px solid var(--kenar);
  border-radius: 14px;
  padding: 14px 16px;
  backdrop-filter: blur(6px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  font-size: 13px;
}

.hudKayit {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 5px 0;
}

.hudEtiket {
  color: var(--soluk);
}

.hudDeger {
  font-weight: 700;
  color: #fff;
  text-align: right;
}

.hudDeger.normal {
  color: var(--doga);
}

.hudDeger.hizli {
  color: var(--kan-kirmizi);
  text-shadow: 0 0 8px rgba(255, 71, 87, 0.6);
}

.hudDeger.kosar {
  color: var(--sinir-sari);
  text-shadow: 0 0 8px rgba(255, 211, 42, 0.4);
}

.hudBirim {
  color: var(--soluk);
  font-size: 11px;
}

/* ---------- LEJANT ---------- */
#legende {
  position: absolute;
  left: 18px;
  bottom: 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--kenar);
  border-radius: 10px;
  font-size: 12px;
  color: var(--metin);
  flex-wrap: wrap;
  backdrop-filter: blur(6px);
}

#legende span {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  margin-right: 5px;
  vertical-align: middle;
}

.renkOksijenli { background: var(--kan-kirmizi); }
.renkOksijensiz { background: var(--ven-koyu); }
.renkSinir { background: var(--sinir-sari); }
.renkAkciger { background: var(--doga); }