/* ════════════════════════════════════════════════
   TRUSS PHYSICS GAME  –  Global Stylesheet
   Group 2 Team A
═══════════════════════════════════════════════ */
:root {
  --bg:          #0b1120;
  --panel:       #1e293b;
  --border:      #334155;
  --text:        #f1f5f9;
  --muted:       #94a3b8;
  --cyan:        #06b6d4;
  --cyan2:       #22d3ee;
  --green:       #22c55e;
  --yellow:      #eab308;
  --red:         #ef4444;
  --blue:        #3b82f6;
  --gold:        #f59e0b;
  --indigo:      #4338ca;
  --font:        'Outfit', sans-serif;
  --mono:        'JetBrains Mono', monospace;
  --radius:      8px;
  --shadow:      0 4px 24px rgba(0,0,0,.5);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── NAVBAR ────────────────────────────────── */
.navbar {
  background: var(--panel);
  border-bottom: 2px solid var(--border);
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 26px; }
.brand-text h1 { font-size: 18px; font-weight: 800; letter-spacing: 1px; color: var(--cyan); line-height: 1; }
.tagline { font-size: 11px; color: var(--muted); }
.header-team { display: flex; align-items: center; gap: 10px; }
.team-badge {
  background: rgba(234,179,8,.15);
  color: var(--yellow);
  border: 1px solid var(--yellow);
  padding: 3px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
}
.btn-icon-header {
  background: rgba(30,58,138,.5);
  border: 1px solid var(--indigo);
  color: var(--yellow);
  width: 34px; height: 34px;
  border-radius: 50%; font-size: 16px;
  cursor: pointer; transition: background .2s;
}
.btn-icon-header:hover { background: var(--indigo); }

/* ── LAYOUT ────────────────────────────────── */
#app { display: flex; flex-direction: column; height: 100vh; }
.main-container {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 12px;
  padding: 12px;
  flex: 1;
  min-height: 0;
}

/* ── CANVAS SECTION ────────────────────────── */
.canvas-section { display: flex; flex-direction: column; gap: 8px; min-height: 0; }
.canvas-header { display: flex; justify-content: space-between; align-items: center; }
.level-info { display: flex; align-items: center; gap: 8px; }
.level-info h2 { font-size: 16px; font-weight: 700; }
.badge {
  background: var(--cyan); color: #0b1120;
  padding: 3px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 700;
}
.badge.yellow { background: var(--yellow); }
.hud-stats { display: flex; gap: 12px; }
.stat-box {
  background: var(--panel); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: var(--radius);
  display: flex; flex-direction: column; align-items: center;
}
.stat-label { font-size: 9px; color: var(--muted); letter-spacing: 1px; }
.stat-value  { font-size: 15px; font-weight: 700; color: var(--yellow); }

.canvas-wrapper {
  position: relative; flex: 1; min-height: 0;
  background: #06101e;
  border: 2px solid var(--border); border-radius: 12px;
  overflow: hidden;
}
#trussCanvas { width: 100%; height: 100%; display: block; }

/* Legend strip */
.legend {
  position: absolute; bottom: 8px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 16px; align-items: center;
  background: rgba(0,0,0,.55); padding: 4px 14px; border-radius: 20px;
  font-size: 11px; color: var(--muted);
}
.leg-item { display: flex; align-items: center; gap: 4px; }
.leg-dot   { width: 10px; height: 10px; border-radius: 2px; }
.tension-dot { background: var(--red); }
.comp-dot    { background: var(--blue); }
.zero-dot    { background: var(--gold); }
.default-dot { background: #fff; opacity: .5; }

/* Overlays */
.overlay-card {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  background: rgba(11,17,32,.95);
  border: 2px solid var(--red);
  padding: 28px 40px; border-radius: 14px;
  text-align: center; z-index: 10;
  box-shadow: var(--shadow);
}
.overlay-card h2 { font-size: 22px; margin-bottom: 8px; }
.overlay-card p  { color: var(--muted); margin-bottom: 16px; font-size: 13px; }
#victory-overlay { border-color: var(--green); }
.alert-icon, .victory-icon { font-size: 36px; margin-bottom: 8px; }

.hidden { display: none !important; }

/* ── SIDEBAR ───────────────────────────────── */
.sidebar {
  display: flex; flex-direction: column; gap: 10px;
  overflow-y: auto; min-height: 0;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.panel-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px;
}
.panel-card h3 { font-size: 14px; color: var(--cyan); margin-bottom: 10px; }

/* Member inspector */
.member-title { font-weight: 600; font-size: 13px; margin-bottom: 4px; }
.member-meta { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.meta-chip {
  background: #0f172a; border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 20px;
  font-size: 11px; color: var(--cyan2); font-family: var(--mono);
}

/* All Joint Angles */
.all-joint-angles-container {
  display: flex; flex-direction: column; gap: 8px;
  max-height: 240px; overflow-y: auto; padding-right: 2px;
}
.all-joint-angles-container::-webkit-scrollbar { width: 4px; }
.all-joint-angles-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.joint-item {
  background: #0f172a; border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 10px;
  transition: all .15s ease;
}
.joint-item.active-joint {
  border-color: var(--cyan);
  background: rgba(6, 182, 212, 0.08);
}
.joint-header {
  font-size: 12px; font-weight: 700; color: var(--cyan);
  margin-bottom: 4px;
}
.joint-angles-row {
  display: flex; flex-wrap: wrap; gap: 4px;
}
.joint-angle-chip {
  background: rgba(15, 23, 42, 0.8); border: 1px solid rgba(51, 65, 85, 0.8);
  padding: 2px 7px; border-radius: 4px;
  font-size: 11px; color: var(--cyan2); font-family: var(--mono);
}

/* Input group */
.input-group { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; }
.input-group label { font-size: 11px; color: var(--muted); }
.hint-small { font-size: 10px; color: var(--gold); }
.input-group input {
  background: #0f172a; border: 1px solid var(--border);
  color: #fff; padding: 7px 10px; border-radius: var(--radius);
  font-size: 13px; outline: none; font-family: var(--mono);
}
.input-group input:focus { border-color: var(--cyan); }

/* Toggle switch – 2 options */
.toggle-switch {
  display: grid; grid-template-columns: 1fr 1fr;
  background: #0f172a; padding: 3px;
  border-radius: var(--radius); border: 1px solid var(--border);
}
.btn-toggle {
  background: none; border: none;
  color: var(--muted); padding: 6px; font-size: 12px; font-weight: 600;
  border-radius: 5px; cursor: pointer; transition: background .15s;
}
.btn-toggle.active-t { background: var(--red);  color: #fff; }
.btn-toggle.active-c { background: var(--blue); color: #fff; }

/* Save button */
.btn-action { width: 100%; padding: 9px; border: none; border-radius: var(--radius); font-weight: 700; cursor: pointer; font-size: 13px; }
.btn-cyan { background: var(--cyan); color: #0b1120; }
.btn-cyan:hover { background: var(--cyan2); }

/* Submit */
.btn-submit {
  width: 100%; padding: 13px;
  background: var(--green); color: #fff;
  border: none; border-radius: var(--radius);
  font-size: 14px; font-weight: 800; cursor: pointer;
  margin-bottom: 10px;
  box-shadow: 0 2px 12px rgba(34,197,94,.35);
}
.btn-submit:hover { filter: brightness(1.1); }

/* Icon row */
.icon-row {
  display: flex; gap: 4px; justify-content: space-between;
  margin-bottom: 8px;
}
.btn-icon {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
  background: #0f172a; border: 1px solid var(--border);
  color: var(--muted); padding: 7px 4px; border-radius: var(--radius);
  font-size: 16px; cursor: pointer; transition: all .15s;
  line-height: 1;
}
.btn-icon span { font-size: 9px; font-weight: 600; letter-spacing: .3px; }
.btn-icon:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-icon#btn-hint:hover  { border-color: var(--gold);  color: var(--gold); }
.btn-icon#btn-sol:hover   { border-color: var(--green); color: var(--green); }
.btn-icon#btn-team-icon:hover { border-color: var(--yellow); color: var(--yellow); }

/* Secondary / full */
.btn-secondary {
  background: var(--border); color: var(--text);
  border: none; padding: 7px; border-radius: var(--radius);
  font-size: 12px; cursor: pointer; transition: background .15s;
}
.btn-secondary:hover { background: #475569; }
.btn-full { width: 100%; }

/* Hint panel */
.hint-card { border-color: var(--gold); }
.hint-header { font-size: 12px; font-weight: 700; color: var(--gold); margin-bottom: 6px; }
#hint-text { font-size: 12px; line-height: 1.55; color: var(--text); }

/* Solution panel */
.sol-card { border-color: var(--green); }
.sol-header { font-size: 12px; font-weight: 700; color: var(--green); margin-bottom: 8px; }
.sol-body { font-size: 11.5px; line-height: 1.6; color: var(--text); }
.sol-body h4 { color: var(--cyan); margin: 8px 0 3px; font-size: 12px; }
.sol-body .sol-step { margin-bottom: 4px; }
.sol-body code { font-family: var(--mono); color: var(--cyan2); background: #0f172a; padding: 1px 4px; border-radius: 3px; font-size: 11px; }
.sol-body .t-label  { color: var(--red);  font-weight: 700; }
.sol-body .c-label  { color: var(--blue); font-weight: 700; }
.sol-body .z-label  { color: var(--gold); font-weight: 700; }

/* Buttons (primary) */
.btn-primary {
  padding: 9px 22px; border: none; border-radius: var(--radius);
  font-size: 13px; font-weight: 700; cursor: pointer;
}
.btn-yellow { background: var(--yellow); color: #000; }
.btn-green  { background: var(--green);  color: #fff; }

/* ── MODALS ────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.72);
  display: flex; justify-content: center; align-items: center;
  z-index: 999;
}
.modal-content {
  background: var(--panel); border: 2px solid var(--cyan);
  border-radius: 14px; padding: 24px;
  width: 520px; max-width: 94vw; max-height: 88vh;
  overflow-y: auto; position: relative;
  box-shadow: var(--shadow);
}
.modal-content.large  { width: 720px; }
.modal-content.calc-modal { width: 340px; }
.modal-close {
  position: absolute; top: 12px; right: 12px;
  background: var(--red); color: #fff;
  border: none; width: 26px; height: 26px;
  border-radius: 50%; cursor: pointer; font-size: 13px;
}
.modal-content h2 { font-size: 17px; margin-bottom: 14px; color: var(--cyan); }
.modal-header { margin-bottom: 14px; }

/* Team grid */
.team-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 4px;
}
.team-card {
  background: #0f172a; border: 1px solid var(--border);
  padding: 9px 12px; border-radius: var(--radius);
  display: flex; align-items: center; gap: 10px;
}
.team-card .num {
  background: var(--yellow); color: #000;
  width: 22px; height: 22px; border-radius: 50%;
  display: flex; justify-content: center; align-items: center;
  font-weight: 800; font-size: 11px; flex-shrink: 0;
}
.t-info { display: flex; flex-direction: column; }
.t-info strong { font-size: 12px; }
.t-info code   { font-size: 10px; color: var(--cyan); font-family: var(--mono); }

/* FBD content */
.fbd-container { background: #0f172a; padding: 16px; border-radius: var(--radius); font-size: 13px; }
.fbd-container h3 { color: var(--cyan); margin-bottom: 8px; }
.fbd-container p  { margin-bottom: 4px; }

/* Calculator */
#calc-display {
  width: 100%; background: #0f172a; color: var(--cyan2);
  border: 1px solid var(--border); font-size: 18px;
  font-family: var(--mono); text-align: right;
  padding: 8px 10px; border-radius: var(--radius); margin-top: 8px;
}
.calc-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 5px; margin-top: 10px; }
.calc-btn {
  background: var(--border); color: #fff;
  border: none; padding: 10px; border-radius: var(--radius);
  font-size: 13px; cursor: pointer;
}
.calc-btn:hover { background: #475569; }
.calc-btn.btn-red   { background: var(--red); }
.calc-btn.btn-green { background: var(--green); }
.calc-btn.span-2    { grid-column: span 2; }

/* Guide */
.guide-text h3 { font-size: 13px; color: var(--cyan); margin: 12px 0 4px; }
.guide-text p  { font-size: 12px; color: var(--muted); line-height: 1.55; }
.guide-text code { font-family: var(--mono); color: var(--cyan2); }