/* ═══════════════════════════════════════════════════
   NAM Network Animator – style.css
   Faithful recreation of the NS-2 NAM tool aesthetic:
   - Gray/silver Tk-style chrome
   - Black simulation canvas
   - Colored rectangular packets on links
   ═══════════════════════════════════════════════════ */

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

:root {
  /* NAM uses a classic Motif/Tk gray UI */
  --chrome:        #d4d0c8;
  --chrome-light:  #ebebeb;
  --chrome-dark:   #808080;
  --chrome-darker: #404040;
  --btn-face:      #d4d0c8;
  --btn-highlight: #ffffff;
  --btn-shadow:    #808080;
  --btn-dark:      #404040;

  /* Simulation canvas */
  --canvas-bg:     #000000;
  --canvas-grid:   #111111;

  /* Packet colors – exact NAM defaults */
  --c-tcp:   #ff0000;   /* red   – TCP data  */
  --c-ack:   #00ff00;   /* green – ACK       */
  --c-cbr:   #ffa500;   /* orange – CBR/UDP  */
  --c-other: #a0a0a0;
  --c-drop:  #ff00ff;   /* magenta – drop    */

  /* Node colors */
  --node-fill:    #c8c8c8;
  --node-stroke:  #ffffff;
  --node-label:   #ffffff;

  /* Link color */
  --link-color: #606060;
  --link-active: #a0a0ff;

  --panel-bg:   #c8c4bc;
  --panel-head: #6870a0;   /* NAM's distinctive blue-purple section header */
  --panel-text: #000000;

  --font-ui:   'Courier New', Courier, monospace;
  --font-mono: 'Courier New', Courier, monospace;
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--chrome);
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--panel-text);
  user-select: none;
}

/* ── MENU BAR ─────────────────────────────────────── */
#menubar {
  display: flex;
  align-items: center;
  height: 24px;
  background: var(--chrome);
  border-bottom: 2px solid var(--btn-shadow);
  padding: 0 4px;
  gap: 0;
  flex-shrink: 0;
}

.menu-group {
  display: flex;
  align-items: center;
  height: 100%;
  position: relative;
}

.menu-title {
  padding: 0 8px;
  height: 100%;
  display: flex;
  align-items: center;
  cursor: default;
  font-size: 12px;
  border: 1px solid transparent;
}
.menu-title:hover {
  border: 1px solid var(--btn-shadow);
  background: var(--chrome-light);
}

.menu-item {
  padding: 0 8px;
  height: 100%;
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 12px;
  border: 1px solid transparent;
}
.menu-item:hover {
  background: var(--chrome-light);
  border: 1px solid var(--btn-shadow);
}

#file-input { display: none; }

#file-badge {
  margin-left: auto;
  font-size: 11px;
  color: var(--chrome-darker);
  padding-right: 8px;
  font-family: var(--font-mono);
}

/* ── WORKSPACE ────────────────────────────────────── */
#workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100vh - 24px - 48px); /* minus menubar and controlbar */
}

/* ── CANVAS AREA ──────────────────────────────────── */
#canvas-wrap {
  flex: 1;
  position: relative;
  background: var(--canvas-bg);
  overflow: hidden;
  /* Inset border – classic Tk sunken relief */
  box-shadow: inset 2px 2px 4px #000, inset -1px -1px 2px #606060;
  border: 2px solid;
  border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark);
}

#main-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: default;
}

/* ── DROP HINT OVERLAY ────────────────────────────── */
#drop-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.82);
  transition: opacity 0.25s;
  z-index: 10;
}
#drop-hint.hidden { opacity: 0; pointer-events: none; }

.hint-box {
  text-align: center;
  border: 1px dashed #404040;
  padding: 32px 48px;
  background: rgba(0,0,0,0.6);
}
.hint-icon { font-size: 36px; color: #606060; margin-bottom: 10px; }
.hint-title {
  font-size: 15px;
  color: #c0c0c0;
  font-family: var(--font-ui);
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.hint-sub  { font-size: 11px; color: #606060; margin-bottom: 16px; }
.hint-sub code { color: #a0a0a0; }

.hint-btn {
  display: inline-block;
  cursor: pointer;
  background: var(--btn-face);
  color: #000;
  font-family: var(--font-ui);
  font-size: 12px;
  padding: 4px 16px;
  border: 2px solid;
  border-color: var(--btn-highlight) var(--btn-dark) var(--btn-dark) var(--btn-highlight);
}
.hint-btn:hover { background: var(--chrome-light); }
.hint-btn:active { border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark); }

/* Credit line below the Open button */
.hint-credit {
  margin-top: 14px;
  font-size: 11px;
  color: #707070;
  font-family: var(--font-ui);
}

/* ── INFO PANEL ───────────────────────────────────── */
#info-panel {
  width: 190px;
  min-width: 190px;
  background: var(--panel-bg);
  border-left: 2px solid;
  border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}

.panel-block {
  border-bottom: 1px solid var(--chrome-dark);
  padding-bottom: 6px;
}

.panel-head {
  background: var(--panel-head);
  color: #ffffff;
  font-size: 11px;
  font-weight: bold;
  padding: 3px 8px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* Legend */
.legend-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 10px;
  font-size: 11px;
}
.swatch {
  display: inline-block;
  width: 28px; height: 8px;
  flex-shrink: 0;
}
.swatch.tcp  { background: var(--c-tcp); }
.swatch.ack  { background: var(--c-ack); }
.swatch.cbr  { background: var(--c-cbr); }
.swatch.drop { background: var(--c-drop); }

/* Stats */
.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 10px;
  font-size: 11px;
  font-family: var(--font-mono);
}
.stat-row span:last-child { font-weight: bold; color: #000080; }

/* Log */
#block-log { flex: 1; display: flex; flex-direction: column; min-height: 0; }
#log-scroll {
  flex: 1;
  overflow-y: auto;
  background: #000;
  margin: 0 4px 4px;
  min-height: 80px;
  max-height: 220px;
}
#log-lines { padding: 2px; }
.log-entry {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 1px 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.5;
}
.log-entry.tcp   { color: var(--c-tcp); }
.log-entry.ack   { color: var(--c-ack); }
.log-entry.cbr   { color: var(--c-cbr); }
.log-entry.drop  { color: var(--c-drop); }
.log-entry.other { color: #a0a0a0; }

/* ── CONTROL BAR ──────────────────────────────────── */
#controlbar {
  height: 48px;
  background: var(--chrome);
  border-top: 2px solid;
  border-color: var(--btn-highlight) var(--btn-dark) var(--btn-dark) var(--btn-highlight);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  flex-shrink: 0;
}

/* Transport buttons */
#transport { display: flex; gap: 3px; }

.tbtn {
  background: var(--btn-face);
  border: 2px solid;
  border-color: var(--btn-highlight) var(--btn-dark) var(--btn-dark) var(--btn-highlight);
  font-size: 13px;
  width: 30px; height: 26px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  padding: 0;
  line-height: 1;
  color: #000;
}
.tbtn:hover   { background: var(--chrome-light); }
.tbtn:active,
.tbtn.pressed {
  border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark);
  background: var(--chrome-dark);
}
.tbtn.primary { color: #000080; }

/* Time display */
#time-block {
  display: flex;
  align-items: baseline;
  gap: 4px;
  background: #000;
  border: 2px solid;
  border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark);
  padding: 2px 8px;
}
.tlabel { font-size: 10px; color: #a0a0a0; }
#time-val {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #00ff00;
  min-width: 90px;
  text-align: right;
}

/* Timeline slider */
#slider-block { flex: 1; }
#timeline {
  width: 100%;
  -webkit-appearance: none;
  height: 6px;
  background: #808080;
  border: 2px solid;
  border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark);
  outline: none;
  cursor: pointer;
}
#timeline::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 20px;
  background: var(--btn-face);
  border: 2px solid;
  border-color: var(--btn-highlight) var(--btn-dark) var(--btn-dark) var(--btn-highlight);
  cursor: pointer;
}

/* Speed control */
#speed-block {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
  height: 32px;
  padding: 4px 8px;
}
#speed-slider {
  -webkit-appearance: none;
  width: 100px; height: 6px;
  background: #808080;
  border: 2px solid;
  border-color: var(--btn-dark) var(--btn-highlight) var(--btn-highlight) var(--btn-dark);
  outline: none;
  cursor: pointer;
}
#speed-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 18px;
  background: var(--btn-face);
  border: 2px solid;
  border-color: var(--btn-highlight) var(--btn-dark) var(--btn-dark) var(--btn-highlight);
  cursor: pointer;
}
#speed-val {
  min-width: 42px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
}
#speed-val {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #000080;
  min-width: 38px;
}

/* ── SCROLLBAR STYLING (webkit) ───────────────────── */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--chrome); }
::-webkit-scrollbar-thumb {
  background: var(--chrome-dark);
  border: 2px solid;
  border-color: var(--btn-highlight) var(--btn-dark) var(--btn-dark) var(--btn-highlight);
}
::-webkit-scrollbar-corner { background: var(--chrome); }