/* ═══════════════════════════════════════════════════════════
   esp32c3-lab — minimal lab platform · 4 themes · EN/FR/AR
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&family=Tajawal:wght@400;500;700&family=Amiri:wght@400;700&display=swap');

/* ─── THEMES ─── */

:root, [data-theme="paper"] {
  --bg:        #fafaf7;
  --panel:     #ffffff;
  --panel-2:   #f4f4ef;
  --text:      #1a1a1a;
  --text-muted:#666;
  --border:    rgba(0,0,0,.14);
  --accent:    #d0021b;        /* paper-red headline */
  --accent2:   #1a1a1a;
  --ok:        #16a34a;
  --warn:      #f59e0b;
  --err:       #ef4444;
  --info:      #2563eb;
  --shadow:    rgba(0,0,0,.05);
  --code-bg:   rgba(0,0,0,.05);
}

[data-theme="steel"] {
  --bg:        #1a1d22;
  --panel:     #232730;
  --panel-2:   #2a2f3a;
  --text:      #e6e8ec;
  --text-muted:#8a909c;
  --border:    rgba(255,255,255,.10);
  --accent:    #5fb3ff;        /* cool steel-blue */
  --accent2:   #ffb547;
  --ok:        #4ade80;
  --warn:      #f59e0b;
  --err:       #ef4444;
  --info:      #5fb3ff;
  --shadow:    rgba(0,0,0,.4);
  --code-bg:   rgba(255,255,255,.05);
}

[data-theme="forest"] {
  --bg:        #f3f6f0;
  --panel:     #ffffff;
  --panel-2:   #ebf0e6;
  --text:      #1a2e0c;
  --text-muted:#5a6b48;
  --border:    rgba(50,80,30,.18);
  --accent:    #2f7a2a;
  --accent2:   #b45309;
  --ok:        #16a34a;
  --warn:      #b45309;
  --err:       #b91c1c;
  --info:      #1e6ba8;
  --shadow:    rgba(40,80,30,.06);
  --code-bg:   rgba(50,80,30,.07);
}

[data-theme="carbon"] {
  --bg:        #0d0d0f;
  --panel:     #16161a;
  --panel-2:   #1d1d22;
  --text:      #e8e8eb;
  --text-muted:#7a7a82;
  --border:    rgba(255,255,255,.08);
  --accent:    #00e5ff;
  --accent2:   #ff2d95;
  --ok:        #22ff88;
  --warn:      #ffb020;
  --err:       #ff3b30;
  --info:      #00e5ff;
  --shadow:    rgba(0,229,255,.08);
  --code-bg:   rgba(255,255,255,.05);
}

[dir="rtl"] { font-family: 'Tajawal', 'Amiri', sans-serif; }

/* ─── RESET / BASE ─── */

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

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.55 'Inter', system-ui, sans-serif;
  transition: background .25s, color .25s;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, kbd {
  font: 12px/1.4 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--text);
}

button {
  font: 500 14px/1.2 'Inter', system-ui, sans-serif;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  transition: all .15s;
}
button:hover:not(:disabled) {
  border-color: var(--accent);
  box-shadow: 0 2px 8px var(--shadow);
}
button:disabled { opacity: .4; cursor: default; }
button.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}
button.primary:hover:not(:disabled) {
  filter: brightness(1.1);
}
button.danger {
  background: var(--err);
  color: #fff;
  border-color: var(--err);
}

input, select, textarea {
  font: 500 14px 'Inter', system-ui, sans-serif;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

/* ─── APP SHELL ─── */

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 16px 80px;
}

header.top {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
  padding: 18px 4px 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}
header.top .title {
  font-weight: 700; font-size: 18px;
  letter-spacing: .03em;
  margin: 0; flex: 1; min-width: 200px;
}
header.top .title a {
  color: var(--text);
}
header.top .title a:hover { color: var(--accent); text-decoration: none; }
header.top .subtitle {
  font-size: 12px; color: var(--text-muted);
  font-weight: 400; margin-left: 8px;
}

.top-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* ─── STATUS PILL ─── */

.status-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
  border: 1px solid var(--border);
  background: var(--panel);
}
.status-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--err);
  box-shadow: 0 0 6px currentColor;
  color: var(--err);
}
.status-pill.connected .dot {
  background: var(--ok); color: var(--ok);
  animation: pulse 2s infinite;
}
@keyframes pulse { 50% { opacity: .5; } }

/* ─── PICKERS (theme + lang) ─── */

.picker {
  font: 500 12px 'Inter', system-ui, sans-serif;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  cursor: pointer;
}

/* ─── BACK LINK ─── */

.back-link {
  font-size: 12px; color: var(--text-muted);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 8px;
  border-radius: 6px;
}
.back-link:hover { background: var(--panel-2); text-decoration: none; }

/* ─── LANDING GRID (index.html) ─── */

.intro {
  font-size: 15px; color: var(--text);
  line-height: 1.65; margin: 0 0 16px;
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 16px 0;
}

.lab-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  transition: all .15s;
}
.lab-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--shadow);
  text-decoration: none;
}
.lab-card .icon {
  font-size: 32px;
  display: block;
  margin-bottom: 8px;
  filter: drop-shadow(0 2px 4px var(--shadow));
}
.lab-card h2 {
  font-size: 16px; font-weight: 700;
  letter-spacing: .02em;
  color: var(--accent);
  margin: 0 0 4px;
}
.lab-card p {
  font-size: 13px; color: var(--text-muted);
  line-height: 1.55; margin: 0;
}

/* ─── LAB PAGE LAYOUT ─── */

.lab-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 18px;
  margin-top: 12px;
}
@media (max-width: 720px) {
  .lab-layout { grid-template-columns: 1fr; }
}

.lab-main {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}
.lab-main h2 {
  font-size: 18px; margin: 0 0 4px;
  color: var(--accent);
}
.lab-main .lab-desc {
  font-size: 13px; color: var(--text-muted);
  line-height: 1.55; margin: 0 0 14px;
}

/* ─── MESSAGE LOG (right rail) ─── */

.log-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  height: 460px;
  overflow: hidden;
}
.log-panel header {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.log-panel header .lbl {
  font-weight: 700; font-size: 12px; letter-spacing: .04em;
  text-transform: uppercase; color: var(--text-muted); flex: 1;
}
.log-panel header button {
  font-size: 11px; padding: 3px 8px;
}
.log-body {
  flex: 1; overflow-y: auto;
  padding: 8px 12px;
  font: 11.5px/1.4 'JetBrains Mono', ui-monospace, monospace;
}
.log-body .line { margin-bottom: 2px; word-break: break-all; }
.log-body .tx   { color: var(--info); }
.log-body .rx   { color: var(--ok); }
.log-body .err  { color: var(--err); }
.log-body .info { color: var(--text-muted); }
.log-body .ts   { color: var(--text-muted); margin-right: 6px; }

/* ─── HELPERS / COMMON CONTROLS ─── */

.row {
  display: flex; gap: 12px; align-items: center;
  flex-wrap: wrap;
  margin: 10px 0;
}
.row label { font-size: 13px; color: var(--text-muted); display: inline-flex; gap: 8px; align-items: center; }
.row input[type="range"] { flex: 1; min-width: 120px; accent-color: var(--accent); }
.row input[type="number"] { width: 80px; }
.row input[type="color"] { width: 50px; height: 30px; border: none; cursor: pointer; padding: 0; background: transparent; }

.value-readout {
  font: 700 14px 'JetBrains Mono', ui-monospace, monospace;
  color: var(--accent);
  min-width: 60px;
  text-align: right;
}

.section {
  border-top: 1px solid var(--border);
  margin-top: 18px; padding-top: 14px;
}
.section h3 {
  font-size: 13px; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 10px;
}

/* ─── JOYSTICK ─── */

.joystick {
  width: 220px; height: 220px;
  margin: 14px auto;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 40%, var(--panel-2), var(--panel));
  border: 2px solid var(--border);
  position: relative;
  touch-action: none;
  user-select: none;
  cursor: grab;
}
.joystick.grabbing { cursor: grabbing; }
.joystick .knob {
  position: absolute;
  top: 50%; left: 50%;
  width: 70px; height: 70px;
  margin: -35px 0 0 -35px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 4px 14px var(--shadow), inset 0 -3px 6px rgba(0,0,0,.15);
  transition: transform .08s cubic-bezier(.18,.89,.32,1.28);
  pointer-events: none;
}
.joystick .axes {
  position: absolute; inset: 0;
  pointer-events: none;
}
.joystick .axes::before,
.joystick .axes::after {
  content: ''; position: absolute;
  background: var(--border);
}
.joystick .axes::before { top: 50%; left: 10%; right: 10%; height: 1px; }
.joystick .axes::after  { left: 50%; top: 10%; bottom: 10%; width: 1px; }

.joy-readout {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
  font: 12px 'JetBrains Mono', ui-monospace, monospace;
  color: var(--text-muted);
  margin-top: 8px;
  text-align: center;
}
.joy-readout span { color: var(--accent); font-weight: 700; }

/* ─── PRESET BUTTON ROW ─── */

.preset-row {
  display: flex; gap: 6px; flex-wrap: wrap;
  margin: 10px 0;
}
.preset-row button {
  font-size: 12px; padding: 6px 12px;
  flex: 1; min-width: 80px;
}

/* ─── PIXEL GRID (NeoPixels) ─── */

.pixel-strip {
  display: flex; gap: 14px;
  justify-content: center;
  margin: 18px 0;
  flex-wrap: wrap;
}
.pixel {
  width: 90px; height: 90px;
  border-radius: 14px;
  border: 2px solid var(--border);
  background: #000;
  display: flex; flex-direction: column;
  align-items: center; justify-content: flex-end;
  padding: 6px;
  position: relative;
  cursor: pointer;
  transition: all .15s;
  color: rgba(255,255,255,.8);
  font: 600 11px 'JetBrains Mono', ui-monospace, monospace;
  text-shadow: 0 1px 2px rgba(0,0,0,.7);
}
.pixel:hover { transform: translateY(-2px); }
.pixel .label {
  position: absolute;
  top: 6px; left: 6px;
  font-size: 10px; letter-spacing: .04em;
}
.pixel input[type="color"] {
  width: 100%; height: 28px;
  margin-top: auto;
}

/* ─── DISTANCE BAR ─── */

.dist-graph {
  width: 100%; height: 80px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
  margin: 12px 0;
}
.dist-bar {
  position: absolute;
  top: 0; bottom: 0; left: 0;
  background: linear-gradient(90deg, var(--ok), var(--warn), var(--err));
  width: 0;
  transition: width .15s ease-out;
}
.dist-readout {
  font: 700 32px 'JetBrains Mono', ui-monospace, monospace;
  color: var(--accent);
  text-align: center;
  margin: 12px 0;
}
.dist-readout small { font-size: 14px; color: var(--text-muted); margin-left: 6px; }

/* ─── BUZZER PIANO ─── */

.piano {
  display: flex; gap: 4px;
  margin: 14px 0;
  flex-wrap: wrap;
}
.key {
  flex: 1;
  min-width: 50px;
  height: 100px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0 0 8px 8px;
  cursor: pointer;
  display: flex; flex-direction: column;
  align-items: center; justify-content: flex-end;
  padding: 8px;
  font: 700 13px 'JetBrains Mono', ui-monospace, monospace;
  color: var(--text);
  transition: all .1s;
}
.key:hover { background: var(--panel-2); }
.key:active, .key.playing {
  background: var(--accent);
  color: var(--bg);
  transform: translateY(2px);
}
.key small { font-size: 9px; color: var(--text-muted); margin-bottom: auto; }
.key.playing small { color: rgba(255,255,255,.7); }

/* ─── LED INDICATORS (status leds D5-D8) ─── */

.led-row {
  display: flex; gap: 12px;
  margin: 14px 0;
  flex-wrap: wrap;
}
.led-item {
  flex: 1; min-width: 100px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
}
.led-item:hover { border-color: var(--accent); }
.led-item.on .indicator {
  box-shadow: 0 0 14px currentColor;
}
.led-item .indicator {
  width: 32px; height: 32px; border-radius: 50%;
  margin: 0 auto 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  transition: all .15s;
}
.led-item .name {
  font: 700 11px 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: .04em;
}
.led-item .pin {
  font-size: 10px; color: var(--text-muted);
}

/* ─── ALERTS / CALLOUTS ─── */

.alert {
  border-left: 3px solid var(--info);
  background: color-mix(in srgb, var(--info) 8%, transparent);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  margin: 12px 0;
  font-size: 13px; line-height: 1.5;
}
.alert.warn { border-left-color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.alert.err  { border-left-color: var(--err);  background: color-mix(in srgb, var(--err) 10%, transparent); }
.alert.ok   { border-left-color: var(--ok);   background: color-mix(in srgb, var(--ok) 10%, transparent); }
.alert strong { display: block; margin-bottom: 3px; font-size: 11px; letter-spacing: .04em; text-transform: uppercase; }

/* ─── FOOTER ─── */

footer.app-footer {
  text-align: center;
  padding: 24px 0 0;
  margin-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 11px; color: var(--text-muted);
  letter-spacing: .04em;
}
footer.app-footer a { color: var(--text-muted); }
footer.app-footer a:hover { color: var(--accent); }