/* NULL-MODEM — 90 年代の外付けモデムとブラウン管の端末 */

:root {
  --desk: #121416;
  --plastic: #1c1d20;
  --plastic-hi: #2c2e33;
  --plastic-lo: #0e0f11;
  --bezel: #cfc6b3;
  --bezel-lo: #a79d88;
  --phosphor: #7cff8a;
  --phosphor-dim: #2e8c3a;
  --amber: #ffb000;
  --led-red: #ff2d1f;
  --led-green: #39ff5a;
  --label: #c9c9c9;
  --pixel: "DotGothic16", "VT323", "Osaka-Mono", monospace;
  --mono: "VT323", "DotGothic16", monospace;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  color: var(--label);
  font-family: var(--pixel);
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(80, 90, 120, 0.25), transparent 70%),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.015) 0 1px, transparent 1px 3px),
    var(--desk);
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

/* ------------------------------------------------------------ モデム本体 */

.modem {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 18px 26px 16px;
  border-radius: 14px 14px 6px 6px;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.025) 0 2px, transparent 2px 6px),
    linear-gradient(180deg, var(--plastic-hi), var(--plastic) 40%, var(--plastic-lo));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    inset 0 -3px 0 rgba(0, 0, 0, 0.6),
    0 14px 0 -6px #070708,
    0 24px 40px rgba(0, 0, 0, 0.7);
  margin-bottom: 26px;
}

/* 筐体の上のスリット */
.modem::before {
  content: "";
  position: absolute;
  left: 30%; right: 30%; top: 7px; height: 4px;
  border-radius: 2px;
  background: repeating-linear-gradient(90deg, #050505 0 10px, transparent 10px 14px);
  opacity: 0.8;
}

.brand { display: flex; flex-direction: column; gap: 2px; }
.logo {
  font-family: "Arial Black", "Helvetica Neue", sans-serif;
  font-style: italic;
  font-weight: 900;
  font-size: 26px;
  letter-spacing: 0.04em;
  color: #eee;
  text-shadow: 0 1px 0 #000;
}
.logo em {
  font-style: italic;
  color: var(--led-red);
}
/* 改造品の印: 赤い筆の殴り書き */
.logo .kai {
  display: inline-block;
  margin-left: 0.2em;
  font-family: "Yuji Boku", serif;
  font-style: normal;
  font-weight: 400;
  font-size: 44px;
  line-height: 0;
  letter-spacing: 0;
  color: #d8150f;
  transform: translateY(6px);
  text-shadow:
    1px 1px 0 #5a0000,
    -1px 0 1px rgba(216, 21, 15, 0.6),
    0 0 6px rgba(255, 40, 20, 0.35);
}
.stripe {
  height: 4px;
  width: 150px;
  background: linear-gradient(90deg, var(--led-red), #ff8a00 50%, transparent);
  transform: skewX(-20deg);
}
.model {
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.25em;
  color: #9a9a9a;
}

.leds {
  display: flex;
  justify-content: center;
  gap: 18px;
  padding: 10px 18px;
  border-radius: 6px;
  background: linear-gradient(#0b0b0c, #151518);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.9), 0 1px 0 rgba(255, 255, 255, 0.06);
}
.led {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: #8d8d8d;
}
.led i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #5a2320, #2a0d0c 70%);
  box-shadow: 0 0 0 1px #000;
  transition: background 0.06s, box-shadow 0.06s;
}
.led.on i {
  background: radial-gradient(circle at 35% 30%, #ffd0c8, var(--led-red) 45%, #8a0d05 90%);
  box-shadow: 0 0 0 1px #000, 0 0 10px 2px rgba(255, 45, 31, 0.8);
}
.led.on span { color: #e6e6e6; }
.led[data-led="MR"].on i, .led[data-led="TR"].on i {
  background: radial-gradient(circle at 35% 30%, #e0ffe4, var(--led-green) 45%, #0b6d1d 90%);
  box-shadow: 0 0 0 1px #000, 0 0 10px 2px rgba(57, 255, 90, 0.7);
}

.power {
  font-family: var(--mono);
  font-size: 18px;
  letter-spacing: 0.2em;
  color: #bbb;
  padding: 12px 18px 10px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  background: linear-gradient(#3a3c41, #232428);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 4px 0 #0a0a0b, 0 6px 10px rgba(0, 0, 0, 0.6);
  transition: transform 0.05s, box-shadow 0.05s;
}
.power:active { transform: translateY(3px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 1px 0 #0a0a0b; }
.power.on { color: var(--led-green); text-shadow: 0 0 8px rgba(57, 255, 90, 0.8); }

/* ------------------------------------------------------------ 操作パネル */

.controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0 4px 18px;
  font-size: 15px;
}
.control-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.controls.transfer { margin: 18px 4px 0; }
.controls label { display: flex; align-items: center; gap: 8px; color: #aaa; }
.controls select, .controls input[type="url"] {
  font-family: var(--pixel);
  font-size: 14px;
  color: var(--phosphor);
  background: #07110a;
  border: 1px solid #2d3a2f;
  border-radius: 3px;
  padding: 5px 8px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.8);
}
.controls button {
  font-family: var(--pixel);
  font-size: 15px;
  color: #ddd;
  padding: 7px 18px 6px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: linear-gradient(#45474d, #2a2b30);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 3px 0 #0b0b0c;
}
.controls button:active { transform: translateY(2px); box-shadow: 0 1px 0 #0b0b0c; }
#dial { background: linear-gradient(#2f6b3a, #1b4424); color: #d8ffd8; }
#hangup { background: linear-gradient(#7a2a24, #4b1612); color: #ffd8d4; }
.controls input[type="range"] { accent-color: var(--amber); }
.controls .volume { margin-left: auto; }
.status {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 18px;
  color: #888;
}
.status b { color: var(--amber); font-weight: normal; text-shadow: 0 0 6px rgba(255, 176, 0, 0.5); }

/* ------------------------------------------------------------ ブラウン管 */

.crt {
  position: relative;
  padding: 26px 30px 34px;
  border-radius: 22px;
  background: linear-gradient(160deg, #ddd5c3, var(--bezel) 40%, var(--bezel-lo));
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.6),
    inset 0 -4px 8px rgba(0, 0, 0, 0.25),
    0 20px 40px rgba(0, 0, 0, 0.6);
}
.crt .plate {
  position: absolute;
  bottom: 8px;
  left: 34px;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.3em;
  color: #6f6655;
}
.crt .plate::after {
  content: "";
  display: inline-block;
  width: 8px; height: 8px; margin-left: 12px;
  border-radius: 50%;
  background: #3fe060;
  box-shadow: 0 0 6px #3fe060;
  vertical-align: middle;
}
.screen {
  position: relative;
  overflow: hidden;
  border-radius: 18px / 14px;
  background: radial-gradient(ellipse at center, #0c1f11 0%, #06110a 70%, #020604 100%);
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.9), inset 0 0 6px rgba(0, 0, 0, 0.9), 0 0 0 3px #1c1a15;
  padding: 18px 16px;
}
/* 走査線と周辺減光 */
.screen::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.28) 0 1px, transparent 1px 3px),
    radial-gradient(ellipse at center, transparent 55%, rgba(0, 0, 0, 0.55) 100%);
  animation: flicker 0.12s infinite alternate;
}
@keyframes flicker {
  from { opacity: 0.92; }
  to { opacity: 1; }
}
#terminal .xterm-rows {
  text-shadow: 0 0 2px rgba(124, 255, 138, 0.9), 0 0 8px rgba(124, 255, 138, 0.35);
}
#terminal .xterm-viewport { background: transparent !important; }
#terminal .xterm-screen { filter: saturate(1.1); }

/* ------------------------------------------------------------ オシロスコープ */

.scopes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 24px;
}
.scopes figure {
  margin: 0;
  padding: 10px 10px 8px;
  border-radius: 8px;
  background: linear-gradient(var(--plastic-hi), var(--plastic-lo));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 8px 18px rgba(0, 0, 0, 0.5);
}
.scopes canvas {
  display: block;
  width: 100%;
  height: 100px;
  border-radius: 4px;
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.9);
}
.scopes figcaption {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.08em;
  color: #9b9b9b;
}
.scopes figcaption b { font-weight: normal; }
.scopes .tx b { color: var(--amber); }
.scopes .rx b { color: var(--phosphor); }

/* ------------------------------------------------------------ 取扱説明書 */

.help {
  margin-top: 26px;
  padding: 14px 20px;
  border-radius: 6px;
  background: #e9e2d0;
  color: #2b2720;
  font-size: 14px;
  line-height: 1.8;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.5);
}
.help summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 18px;
  letter-spacing: 0.15em;
}
.help table { border-collapse: collapse; margin: 8px 0; }
.help td, .help th { border: 1px solid #b9ae95; padding: 3px 12px; text-align: left; }
.help th { background: #d8cfb9; }
.help code { background: #d8cfb9; padding: 0 5px; border-radius: 2px; font-family: var(--pixel); }

@media (max-width: 760px) {
  .modem { grid-template-columns: 1fr; justify-items: center; }
  .leds { flex-wrap: wrap; }
  .scopes { grid-template-columns: 1fr; }
  .status, .controls .volume { margin-left: 0; }
  .crt { padding: 14px 12px 30px; }
}

[hidden] { display: none !important; }