/* Fallout Pip-Boy 3000 style — green phosphor CRT, scanlines, terminal chrome. */

:root {
  --pb-green: #2eff7b;
  --pb-green-hi: #8fffb0;
  --pb-green-dim: #1c9e52;
  --pb-green-ghost: rgba(46, 255, 123, 0.12);
  --pb-amber: #ffb03a;
  --pb-bg: #031408;
  --pb-bg2: #06230f;
  --pb-panel: rgba(10, 50, 22, 0.55);
  --pb-line: rgba(46, 255, 123, 0.35);
  --pb-line-soft: rgba(46, 255, 123, 0.16);
  --danger: #ff5b4a;
  --glowtext: 0 0 6px rgba(46, 255, 123, 0.8), 0 0 18px rgba(46, 255, 123, 0.35);
  --font: "Cascadia Mono", "Courier New", Consolas, monospace;
  --radius: 4px;
}

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

body {
  font-family: var(--font);
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 12px;
  background:
    radial-gradient(900px 600px at 50% 45%, rgba(20, 90, 45, 0.18), transparent 70%),
    radial-gradient(1200px 800px at 80% 100%, rgba(10, 40, 20, 0.35), transparent 60%),
    #020a05;
  color: var(--pb-green);
}

/* ==================== Pip-Boy casing ==================== */

.ff-window {
  width: min(1060px, 100%);
  border-radius: 26px 26px 14px 14px;
  background: linear-gradient(160deg, #1b1f1a, #101310 55%, #070907);
  border: 1px solid #30352e;
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.85),
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 0 60px rgba(46, 255, 123, 0.06);
  padding: 12px;
  position: relative;
}
/* side casings */
.ff-window::before,
.ff-window::after {
  content: "";
  position: absolute;
  top: 40px;
  width: 22px;
  height: 140px;
  border-radius: 6px;
  background: linear-gradient(90deg, #262b24, #141714);
  border: 1px solid #383f36;
}
.ff-window::before { left: -14px; }
.ff-window::after { right: -14px; }

/* CRT screen bezel wraps everything below the titlebar */
.screen-bezel {
  border-radius: 12px;
  border: 2px solid #2c322b;
  background: var(--pb-bg);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.9);
}

/* scanlines + vignette + flicker — pure CSS CRT */
.crt-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 70;
  background:
    repeating-linear-gradient(180deg,
      rgba(0, 0, 0, 0.22) 0 1px,
      transparent 1px 3px),
    radial-gradient(120% 100% at 50% 50%, transparent 55%, rgba(0, 0, 0, 0.55) 100%);
  mix-blend-mode: multiply;
  animation: crt-flicker 4s steps(60) infinite;
}
@keyframes crt-flicker {
  0%, 100% { opacity: 0.92; }
  7%  { opacity: 0.98; }
  9%  { opacity: 0.88; }
  41% { opacity: 0.96; }
  43% { opacity: 0.9; }
  77% { opacity: 0.99; }
}
@media (prefers-reduced-motion: reduce) {
  .crt-layer { animation: none; }
}

/* ==================== titlebar ==================== */

.titlebar {
  position: relative;
  height: 34px;
  background: linear-gradient(180deg, #171b16, #0e100d);
  border-bottom: 1px solid var(--pb-line-soft);
  display: flex;
  align-items: center;
  border-radius: 10px 10px 0 0;
  margin: -12px -12px 0;
  padding: 0 46px 0 18px;
}
.titlebar-caption {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--pb-green-dim);
  text-transform: uppercase;
  user-select: none;
}
.titlebar-dots { display: none; }
.titlebtn {
  position: absolute;
  top: 9px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0;
  cursor: default;
  background: #22271f;
  border: 1px solid #3a4137;
}
.titlebtn.min  { right: 64px; }
.titlebtn.max  { right: 42px; }
.titlebtn.close { right: 20px; }
.titlebtn:hover { border-color: var(--pb-green-dim); }
.titlebtn.close:hover { background: rgba(255, 91, 74, 0.25); border-color: var(--danger); }
.titlebtn::after {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #454c43;
}
.titlebtn.close::after { background: #63312c; }

/* ==================== tabstrip ==================== */

.tabbar {
  background: var(--pb-bg2);
  border-bottom: 1px solid var(--pb-line);
  display: flex;
  align-items: stretch;
  padding: 8px 12px 0;
  gap: 6px;
}
.tab {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 30px;
  padding: 0 14px;
  border: 1px solid var(--pb-line-soft);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  background: rgba(46, 255, 123, 0.04);
  color: var(--pb-green-dim);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: default;
  position: relative;
  max-width: 300px;
}
.tab.active {
  background: var(--pb-panel);
  color: var(--pb-green);
  border-color: var(--pb-line);
  text-shadow: var(--glowtext);
}
.tab.active::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--pb-green);
  box-shadow: 0 0 10px var(--pb-green);
}
.tab-icon { font-size: 13px; }
.tab-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tab-close { margin-left: 10px; opacity: 0.55; font-size: 11px; }
.tab-close:hover { opacity: 1; color: var(--danger); }
.tab.newtab {
  width: 34px;
  justify-content: center;
  font-size: 15px;
  background: none;
  border-style: dashed;
  color: var(--pb-green-dim);
}
.tab.newtab:hover { color: var(--pb-green); border-color: var(--pb-line); }

/* ==================== nav toolbar / urlbar ==================== */

.navtoolbar {
  background: rgba(6, 30, 14, 0.6);
  border-bottom: 1px solid var(--pb-line);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  position: relative;
}
.nav-btns { display: flex; gap: 4px; }
.nav-btn {
  width: 30px;
  height: 30px;
  border: 1px solid var(--pb-line-soft);
  border-radius: var(--radius);
  background: rgba(46, 255, 123, 0.05);
  color: var(--pb-green);
  font-size: 14px;
  display: grid;
  place-items: center;
  cursor: pointer;
}
.nav-btn:hover {
  border-color: var(--pb-green-dim);
  background: var(--pb-green-ghost);
  text-shadow: var(--glowtext);
}
.nav-btn:active { transform: scale(0.93); }
.nav-btn.fwd { opacity: 0.25; pointer-events: none; transform: scaleX(-1); }
.nav-btn.reload { font-size: 16px; }
.nav-btn.active {
  border-color: var(--pb-green);
  background: var(--pb-green-ghost);
  text-shadow: var(--glowtext);
  box-shadow: 0 0 12px rgba(46, 255, 123, 0.35), inset 0 0 8px rgba(46, 255, 123, 0.2);
}
.nav-btn svg path { stroke: var(--pb-green); }
.nav-right { display: flex; gap: 4px; margin-left: auto; }

.urlbar-wrap { flex: 1; position: relative; }
.urlbar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--radius);
  border: 1px solid var(--pb-line);
  background: rgba(2, 18, 8, 0.85);
  box-shadow: inset 0 0 14px rgba(46, 255, 123, 0.12);
}
.urlbar:focus-within {
  border-color: var(--pb-green);
  box-shadow: inset 0 0 14px rgba(46, 255, 123, 0.2), 0 0 16px rgba(46, 255, 123, 0.25);
}
.urlbar-icon { color: var(--pb-green-dim); font-size: 12px; }
.urlbar input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  outline: none;
  color: var(--pb-green-hi);
  font-size: 15px;
  font-family: var(--font);
  caret-color: var(--pb-green);
  text-shadow: var(--glowtext);
}
.urlbar input::placeholder {
  color: rgba(46, 255, 123, 0.35);
  text-shadow: none;
  font-size: 12px;
  letter-spacing: 0.5px;
}
.urlbar-kbd {
  font-size: 10px;
  color: var(--pb-green-dim);
  border: 1px solid var(--pb-line-soft);
  border-radius: 3px;
  padding: 1px 6px;
}
.urlbar:focus-within .urlbar-kbd { display: none; }

/* awesome bar dropdown */
.awesomebar {
  position: absolute;
  top: calc(100% + 4px);
  left: 0; right: 0;
  background: #05190b;
  border: 1px solid var(--pb-green);
  border-radius: var(--radius);
  box-shadow: 0 0 24px rgba(46, 255, 123, 0.3), inset 0 0 20px rgba(0, 0, 0, 0.8);
  z-index: 40;
  overflow: hidden;
}
.sugg {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 13px;
  border-bottom: 1px solid var(--pb-line-soft);
}
.sugg:hover { background: var(--pb-green-ghost); }
.sugg-icon { color: var(--pb-green-dim); width: 16px; text-align: center; }
.sugg-expr { flex: 1; color: var(--pb-green-hi); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sugg-res { color: var(--pb-amber); }

/* ==================== content ==================== */

.content {
  display: flex;
  background:
    radial-gradient(1000px 500px at 50% 0%, rgba(46, 255, 123, 0.05), transparent 65%),
    linear-gradient(180deg, var(--pb-bg2), var(--pb-bg));
  min-height: 440px;
  position: relative;
}

/* background hex/terminal pattern */
.content::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.05;
  background-image:
    repeating-linear-gradient(60deg, var(--pb-green) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(-60deg, var(--pb-green) 0 1px, transparent 1px 26px);
}

.page {
  flex: 1;
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  z-index: 1;
}

/* display — big phosphor readout */
.display-card {
  background: rgba(3, 20, 8, 0.9);
  border: 1px solid var(--pb-line);
  border-radius: var(--radius);
  padding: 14px 18px 12px;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.85), inset 0 0 12px rgba(46, 255, 123, 0.12);
  position: relative;
}
.display-card::before {
  content: "CALCULATIONS";
  position: absolute;
  top: -8px;
  left: 14px;
  padding: 0 8px;
  background: var(--pb-bg);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--pb-green-dim);
}
.display-expr {
  font-size: 13px;
  color: var(--pb-green-dim);
  min-height: 17px;
  text-align: right;
  overflow-wrap: anywhere;
}
.display-value {
  font-size: 46px;
  font-weight: 700;
  text-align: right;
  letter-spacing: 2px;
  overflow-wrap: anywhere;
  margin-top: 2px;
  color: var(--pb-green);
  text-shadow: 0 0 8px rgba(46, 255, 123, 0.9), 0 0 26px rgba(46, 255, 123, 0.45),
    0 0 60px rgba(46, 255, 123, 0.2);
}
.display-value::after {
  content: "_";
  animation: cursor-blink 1.1s steps(1) infinite;
  color: var(--pb-green-hi);
}
@keyframes cursor-blink { 50% { opacity: 0; } }
.display-value.is-err {
  color: var(--danger);
  text-shadow: 0 0 8px rgba(255, 91, 74, 0.8), 0 0 24px rgba(255, 91, 74, 0.35);
}
.display-error {
  margin-top: 4px;
  text-align: right;
  color: var(--danger);
  font-size: 13px;
  letter-spacing: 0.5px;
}
@media (prefers-reduced-motion: reduce) {
  .display-value::after { animation: none; }
}

/* keypad */
.keypad {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}
.k {
  height: 50px;
  border: 1px solid var(--pb-line-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(46, 255, 123, 0.10), rgba(46, 255, 123, 0.04));
  color: var(--pb-green-hi);
  font-size: 16px;
  font-family: var(--font);
  font-weight: 700;
  cursor: pointer;
  text-shadow: 0 0 6px rgba(46, 255, 123, 0.5);
  box-shadow: inset 0 1px 0 rgba(46, 255, 123, 0.15), 0 2px 0 rgba(0, 0, 0, 0.6);
}
.k:hover {
  background: var(--pb-green-ghost);
  border-color: var(--pb-green-dim);
  box-shadow: 0 0 14px rgba(46, 255, 123, 0.35), inset 0 1px 0 rgba(46, 255, 123, 0.2);
}
.k:active { transform: translateY(1px); box-shadow: 0 1px 0 rgba(0, 0, 0, 0.6); }
.k.num { font-size: 18px; }
.k.op { color: var(--pb-amber); text-shadow: 0 0 6px rgba(255, 176, 58, 0.6); }
.k.fn { font-size: 13px; color: var(--pb-green-dim); }
.k.warn { color: var(--danger); text-shadow: 0 0 6px rgba(255, 91, 74, 0.6); }
.k.eq {
  background: var(--pb-green);
  border-color: var(--pb-green-hi);
  color: #04150a;
  font-size: 22px;
  text-shadow: none;
  box-shadow: 0 0 20px rgba(46, 255, 123, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.k.eq:hover { background: var(--pb-green-hi); }

.chipshelp { color: var(--pb-green-dim); font-size: 11px; letter-spacing: 1px; text-transform: uppercase; }

/* ==================== library sidebar ==================== */

.library {
  width: 280px;
  flex-shrink: 0;
  background: rgba(4, 22, 10, 0.92);
  border-left: 1px solid var(--pb-line);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}
.library.hidden { display: none; }
.lib-header {
  padding: 14px 16px 8px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--pb-green);
  text-shadow: var(--glowtext);
}
.lib-tabs { display: flex; border-bottom: 1px solid var(--pb-line); }
.lib-tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--pb-green-dim);
  font-size: 11px;
  font-family: var(--font);
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 0 10px;
  cursor: pointer;
  position: relative;
}
.lib-tab.active { color: var(--pb-green); text-shadow: var(--glowtext); }
.lib-tab.active::after {
  content: "";
  position: absolute;
  left: 22%; right: 22%; bottom: 0;
  height: 2px;
  background: var(--pb-green);
  box-shadow: 0 0 10px var(--pb-green);
}
.lib-panel { padding: 4px 0; overflow-y: auto; }
.history-list { list-style: none; }
.history-empty { padding: 16px; color: var(--pb-green-dim); font-size: 12px; }
.history-item {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 7px 16px;
  cursor: pointer;
  font-size: 12px;
  border-bottom: 1px solid rgba(46, 255, 123, 0.08);
}
.history-item::before { content: "> "; color: var(--pb-green-dim); }
.history-item:hover { background: var(--pb-green-ghost); }
.h-main {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--pb-green-hi);
}
.h-res { color: var(--pb-amber); }
.history-item.bad .h-res { color: var(--danger); }
.history-item.bad .h-main { opacity: 0.5; }

.funcs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  padding: 12px 16px;
}
.func {
  background: rgba(46, 255, 123, 0.06);
  border: 1px solid var(--pb-line-soft);
  border-radius: var(--radius);
  color: var(--pb-green-hi);
  font-size: 12px;
  font-family: var(--font);
  padding: 7px 0;
  cursor: pointer;
}
.func:hover {
  border-color: var(--pb-green);
  background: var(--pb-green-ghost);
  text-shadow: var(--glowtext);
}
.lib-note {
  padding: 4px 16px 14px;
  color: var(--pb-green-dim);
  font-size: 11px;
  line-height: 1.6;
}

/* ==================== statusbar ==================== */

.statusbar {
  height: 28px;
  background: rgba(6, 28, 12, 0.9);
  border-top: 1px solid var(--pb-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--pb-green-dim);
}
.statusbar::before { content: "■"; color: var(--pb-green); margin-right: 8px; animation: cursor-blink 2s steps(1) infinite; }

/* ==================== modal ==================== */

.modal-veil {
  position: fixed;
  inset: 0;
  background: rgba(1, 8, 3, 0.85);
  display: grid;
  place-items: center;
  z-index: 100;
}
.modal-veil[hidden] { display: none; }
.modal {
  width: min(580px, 92vw);
  max-height: 80vh;
  overflow-y: auto;
  background: #041608;
  border: 1px solid var(--pb-green);
  border-radius: var(--radius);
  box-shadow: 0 0 40px rgba(46, 255, 123, 0.35), inset 0 0 30px rgba(0, 0, 0, 0.8);
  color: var(--pb-green-hi);
  font-family: var(--font);
}
.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 13px 18px;
  border-bottom: 1px solid var(--pb-line);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--pb-green);
  text-shadow: var(--glowtext);
}
.modal-close {
  background: none;
  border: 1px solid var(--pb-line-soft);
  color: var(--pb-green-dim);
  font-size: 12px;
  cursor: pointer;
  width: 26px; height: 26px;
  border-radius: var(--radius);
}
.modal-close:hover { color: var(--danger); border-color: var(--danger); }
.modal-body { padding: 16px 20px; font-size: 13px; line-height: 1.5; }
.modal-body h3 {
  margin: 14px 0 6px;
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--pb-amber);
}
.modal-body h3:first-child { margin-top: 0; }
.modal-body h3::before { content: "### "; }
.modal-body ul { padding-left: 4px; display: flex; flex-direction: column; gap: 5px; list-style: none; }
.modal-body li::before { content: "> "; color: var(--pb-green-dim); }
.modal-body code {
  background: rgba(46, 255, 123, 0.1);
  border: 1px solid var(--pb-line-soft);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 12px;
  color: var(--pb-amber);
}

/* ==================== responsive ==================== */

@media (max-width: 860px) {
  .content { flex-direction: column; }
  .library { width: auto; border-left: none; border-top: 1px solid var(--pb-line); }
  .keypad { grid-template-columns: repeat(3, 1fr); }
  .display-value { font-size: 34px; }
}