:root {
  --pink:#e9598c;
  --green:#32b37b;
  --blue:#3b82f6;
  --ink:#0f172a;
  --muted:#4b5563;
  --paper:#ffffff;
  --paper-light:#f8fafc;
  --shadow:0 6px 18px rgba(0,0,0,.07);
  --danger-color:#dc3545;
}

*,*::before,*::after { box-sizing:border-box; }
html { scroll-behavior:smooth; }

@keyframes fadeIn {
  from { opacity:0; transform:translateY(10px); }
  to { opacity:1; transform:translateY(0); }
}

body {
  margin:0;
  padding:0;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--paper-light);
  display:flex;
  justify-content:center;
  align-items:flex-start;
  min-height:100vh;
  overflow-x:hidden;
}

/* MAIN CONTAINER */
.app-container {
  width:100%;
  max-width:800px;
  background:rgba(255,255,255,0.95);
  backdrop-filter:blur(12px);
  border:1px solid #d1d5db;
  border-radius:10px;
  padding:5px;
  padding-bottom:10px; /* reduced from 90px */
  animation:fadeIn 0.5s ease-out;
  box-shadow:none;
}

.app-container::-webkit-scrollbar { display:none; }

/* MOBILE FLUSH EDGE FIX */
@media (max-width:768px) {
  body { padding:0; }
  .app-container {
    max-width:100%;
    border-radius:0;
    border-left:none;
    border-right:none;
  }
}

/* HEADER */
header { text-align:center; margin-bottom:20px; }
header h1 {
  font-size:2.1rem;
  margin:0;
  color:var(--ink);
  font-weight:800;
}

/* MAIN CONTROLS */
.main-control {
  display:flex;
  flex-direction:column;
  align-items:center;
  margin-bottom:20px;
}

#playButton {
  width:80px;
  height:80px;
  border-radius:50%;
  border:none;
  background-image:linear-gradient(45deg,var(--green),#4ade80);
  color:#fff;
  font-size:1.2em;
  font-weight:700;
  cursor:pointer;
  transition:all 0.2s ease-in-out;
  display:grid;
  place-items:center;
}
#playButton:hover { transform:scale(1.05); }
#playButton.playing {
  background-image:linear-gradient(45deg,var(--pink),#f472b6);
}
#timerDisplay {
  margin-top:15px;
  font-size:1.7em;
  font-weight:700;
  color:var(--ink);
}

/* TABS */
.tabs {
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:8px;
  margin:16px 0;
}
.tab {
  display:flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:8px 6px;
  border-radius:12px;
  background-color:var(--paper-light);
  border:2px solid transparent;
  font-weight:600;
  font-size:0.85em;        /* slightly smaller */
  letter-spacing:-0.02em;  /* tighten */
  white-space:nowrap;      /* prevent wrapping */
  cursor:pointer;
  transition:all 0.2s ease;
  user-select:none;
}
.tab:hover { background-color:#eef2ff; }
.tab.active {
  color:var(--blue);
  background-color:#eef2ff;
  border-color:var(--blue);
  box-shadow:0 2px 8px rgba(59,130,246,0.2);
}
.tab.disabled { opacity:0.6; }
.tab input[type="checkbox"] {
  accent-color:var(--green);
  transform:scale(1.1);
  cursor:pointer;
  pointer-events:all;
}
.tab-label { pointer-events:none; }

/* PANELS */
.control-panel { display:grid; gap:14px; }
.control-group { width:100%; }

.control-label {
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:8px;
  font-weight:600;
  font-size:0.9em;
}
.control-label .value-display {
  font-weight:500;
  color:var(--muted);
  background-color:#f1f5f9;
  padding:2px 8px;
  border-radius:6px;
  font-size:0.95em;
}

/* TOOLTIP */
.tooltip-trigger {
  cursor:help;
  color:var(--muted);
  margin-left:8px;
  position:relative;
}
.tooltip-text {
  visibility:hidden;
  width:250px;
  background-color:var(--ink);
  color:var(--paper);
  text-align:center;
  border-radius:6px;
  padding:8px;
  position:absolute;
  z-index:10;
  bottom:125%;
  left:50%;
  margin-left:-125px;
  opacity:0;
  transition:opacity 0.3s;
  font-size:0.85em;
  font-weight:400;
  line-height:1.5;
}
.tooltip-trigger:hover .tooltip-text {
  visibility:visible;
  opacity:1;
}

/* SLIDERS */
input[type="range"] {
  -webkit-appearance:none;
  width:100%;
  height:8px;
  background:#e2e8f0;
  border-radius:5px;
  outline:none;
  transition:background 0.2s ease;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance:none;
  appearance:none;
  width:20px;
  height:20px;
  background:var(--paper);
  border:2px solid var(--blue);
  border-radius:50%;
  cursor:pointer;
  transition:transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow:0 0 0 2px rgba(255,255,255,0.5);
}
input[type="range"]:hover::-webkit-slider-thumb {
  transform:scale(1.1);
  box-shadow:0 0 0 4px rgba(59,130,246,0.2);
}

/* SELECTS & BUTTONS */
select,.btn {
  padding:0.7rem 1rem;
  border-radius:12px;
  font-weight:600;
  border:1px solid #e2e8f0;
  background:#fff;
  color:var(--ink);
  box-shadow:0 2px 4px rgba(0,0,0,0.05);
  font-family:inherit;
  font-size:0.95em;
  cursor:pointer;
  transition:all 0.2s ease;
}
select:hover,.btn:hover {
  border-color:#cbd5e1;
  box-shadow:0 3px 6px rgba(0,0,0,0.07);
}
select { width:100%; }

.preset-actions { display:flex; gap:8px; margin-top:8px; }
.btn.delete { background-color:var(--danger-color); color:#fff; border-color:transparent; }

/* INFO BOX */
.protocol-info {
  font-size:0.85em;
  color:var(--muted);
  background-color:var(--paper-light);
  padding:12px;
  border-radius:12px;
  margin-top:8px;
  line-height:1.5;
  transition:all 0.3s ease;
}
.protocol-info.hidden {
  opacity:0;
  max-height:0;
  padding:0 12px;
  margin-top:0;
  overflow:hidden;
}

/* ADVANCED TOGGLE */
.advanced-toggle {
  font-weight:600;
  font-size:0.95em;
  cursor:pointer;
  padding:10px;
  background-color:var(--paper-light);
  border-radius:12px;
  text-align:center;
  margin-top:10px;
  transition:background-color 0.2s ease;
}
.advanced-toggle:hover { background-color:#eef2ff; }
.advanced-toggle::after {
  content:" ▼";
  font-size:0.8em;
  display:inline-block;
  transition:transform 0.3s ease;
}
.advanced-toggle.open::after { transform:rotate(180deg); }

/* ADVANCED CONTROLS */
.hidden-controls {
  display:grid;
  gap:14px;
  overflow:hidden;
  max-height:0;
  margin-top:0;
  padding:0 5px;
  background-color:transparent;
  transition:max-height 0.5s ease-in-out, padding 0.5s ease-in-out, margin-top 0.5s ease-in-out;
  border-radius:10px;
}
.hidden-controls.open {
  max-height:1000px;
  margin-top:12px;
  padding:5px;
  background-color:var(--paper-light);
}