/* ==========================================================================
   SPRINKLERDUDE UI KIT — STEP 5: HEAD PANEL AND SWAP / INSTALL FORM
   Paste after the step 4 block.
   Covers ARCHITECTURE.md section 4: #13 Sprinkler head panel,
   #23 Install a head, #27 Swap head tab.

   Goal for the most-used panel: on a phone the tool buttons are on the first
   screen, without scrolling past the diagram to reach them.
   ========================================================================== */

/* 7.0 Tokens --------------------------------------------------------------- */
:root {
  --sd-diagram-size: 180px;           /* desktop */
  --sd-diagram-size-sm: 112px;        /* phones */
  --sd-head-side: 340px;              /* left column on a landscape phone */
  --sd-option-min: 148px;             /* narrowest a radio button may get */
  --sd-option-min-lg: 190px;          /* the same, on desktop */
  --sd-radio: 18px;
  --sd-mark: 20px;                    /* ✔ / ✖ badge on a message line */
}

/* 7.1 Small shared pieces --------------------------------------------------- */
/* Quiet helper text: the line above the tool buttons, parts cost, Gus tips */
.sd-note {
  margin: 0;
  color: var(--sd-ink-soft);
  font-size: var(--sd-fs-sm);
  line-height: 1.4;
}

/* Feedback line. Empty = hidden. The kind is a mark as well as a color. */
.sd-msg {
  display: flex;
  align-items: flex-start;
  gap: var(--sd-sp-2);
  margin: 0;
  padding: var(--sd-sp-2) var(--sd-sp-3);
  border: var(--sd-bw) solid var(--sd-ink);
  border-radius: var(--sd-r-md);
  background: var(--sd-paper-2);
  font-size: var(--sd-fs-sm);
  font-weight: 700;
  line-height: 1.35;
  overflow-wrap: anywhere;
}
.sd-msg:empty { display: none; }
.sd-msg--good,
.sd-msg--bad { --sd-msg-color: var(--sd-green-text); }
.sd-msg--good::before,
.sd-msg--bad::before {
  content: "✔";
  display: grid;
  place-items: center;
  flex: none;
  width: var(--sd-mark);
  height: var(--sd-mark);
  border-radius: var(--sd-r-sm);
  background: var(--sd-msg-color);
  color: var(--sd-paper);
  font-size: var(--sd-fs-xs);
  font-weight: 900;
  line-height: 1;
}
.sd-msg--good { background: var(--sd-lime-tint); }
.sd-msg--bad { --sd-msg-color: var(--sd-red-text); background: var(--sd-red-tint); }
.sd-msg--bad::before { content: "✖"; }

/* Small status word after a value, such as "running" */
.sd-tag {
  display: inline-block;
  margin-left: var(--sd-sp-1);
  padding: 1px 7px;
  border-radius: var(--sd-r-pill);
  background: var(--sd-paper-2);
  color: var(--sd-ink-soft);
  font-size: var(--sd-fs-xs);
  font-weight: 800;
  white-space: nowrap;
}
.sd-tag--on { background: var(--sd-blue-tint); color: var(--sd-blue-text); }

/* The engine's diagram canvas (drawn at 180 × 180, scaled by CSS) */
.sd-diagram {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  border: var(--sd-bw) solid var(--sd-ink);
  border-radius: var(--sd-r-md);
  background: var(--sd-paper-2);
}

/* 7.2 Head panel layout ----------------------------------------------------- */
/* .sd-head > .sd-head__top (diagram + specs), .sd-observe, .sd-head__work */
.sd-head {
  display: grid;
  gap: var(--sd-sp-3);
  min-width: 0;
}
.sd-head__top {
  display: grid;
  grid-template-columns: var(--sd-diagram-size-sm) minmax(0, 1fr);
  gap: var(--sd-sp-3);
  align-items: start;
}
.sd-specs {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 3px var(--sd-sp-3);
  margin: 0;
  font-size: var(--sd-fs-sm);
  line-height: 1.3;
}
.sd-specs dt { color: var(--sd-ink-soft); font-weight: 800; }
.sd-specs dd { margin: 0; overflow-wrap: anywhere; }

/* "You watch it run: …" */
.sd-observe {
  margin: 0;
  padding: var(--sd-sp-2) var(--sd-sp-3) var(--sd-sp-2) calc(var(--sd-sp-3) + 5px);
  border: var(--sd-bw) solid var(--sd-ink);
  border-radius: var(--sd-r-md);
  background: var(--sd-blue-tint);
  box-shadow: inset 5px 0 0 var(--sd-blue);
  font-size: var(--sd-fs-sm);
  line-height: 1.4;
}

.sd-head__work { min-width: 0; }
/* What a tab shows: its controls, then the feedback line */
.sd-tabpanel {
  display: grid;
  gap: var(--sd-sp-3);
  min-width: 0;
  padding-top: var(--sd-sp-3);
}

/* Tabs that share the row instead of scrolling: names wrap onto two lines,
   so on a phone every tool is visible at once. Add to a kit .sd-tabs. */
.sd-tabs--fit {
  align-items: stretch;
  overflow: visible;
  padding: 0;
}
.sd-tabs--fit .sd-tab {
  flex: 1 1 auto;
  min-width: min-content;             /* shrink until the longest word, never into it */
  padding: var(--sd-sp-1);
  font-size: var(--sd-fs-sm);
  letter-spacing: 0;
  line-height: var(--sd-lh-tight);
  white-space: normal;
}

/* 7.3 Adjustment tool ------------------------------------------------------- */
.sd-adjust {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sd-sp-3) var(--sd-sp-2);
  align-items: center;
  padding-bottom: 4px;                /* room for the last row's hard shadow */
}
.sd-adjust__label {
  max-width: 6.5em;
  font-size: var(--sd-fs-sm);
  font-weight: 800;
  line-height: 1.2;
}
.sd-adjust .sd-btn { min-width: 0; padding: 0 var(--sd-sp-2); }
.sd-adjust__wide { grid-column: span 2; }

/* 7.4 Radio options that look like buttons ---------------------------------- */
/* <label class="sd-option"><input class="sd-option__input" type="radio" name="…">
     <span class="sd-option__face"><span class="sd-option__icon">◑</span> 12-ft Half (180°)</span></label>
   The chosen one is lime, pressed in, and its dot is filled. */
.sd-options {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--sd-option-min), 1fr));
  gap: var(--sd-sp-2);
  padding-bottom: 3px;
}
.sd-option { position: relative; display: block; min-width: 0; }
.sd-option__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}
.sd-option__face {
  display: flex;
  align-items: center;
  gap: var(--sd-sp-2);
  min-height: var(--sd-tap);
  padding: var(--sd-sp-1) var(--sd-sp-3);
  border: var(--sd-bw) solid var(--sd-ink);
  border-radius: var(--sd-r-md);
  background: var(--sd-paper);
  font-size: var(--sd-fs-sm);
  font-weight: 600;
  line-height: 1.2;
  box-shadow: var(--sd-shadow-btn-sm);
  transition: transform var(--sd-dur) ease-out, box-shadow var(--sd-dur) ease-out;
}
.sd-option__face::before {            /* the radio dot */
  content: "";
  flex: none;
  width: var(--sd-radio);
  height: var(--sd-radio);
  border: var(--sd-bw) solid var(--sd-ink);
  border-radius: 50%;
  background: var(--sd-paper);
}
.sd-option__icon {
  flex: none;
  color: var(--sd-blue-text);
  font-size: var(--sd-fs-lg);
  line-height: 1;
}
.sd-option--current .sd-option__face { font-weight: 800; }   /* what is fitted now */
@media (hover: hover) {
  .sd-option__input:not(:checked):not(:disabled):hover + .sd-option__face { background: var(--sd-lime-tint); }
}
.sd-option__input:checked + .sd-option__face {
  background: var(--sd-lime);
  font-weight: 800;
  transform: translateY(2px);
  box-shadow: var(--sd-shadow-pressed);
}
.sd-option__input:checked + .sd-option__face::before {
  background: radial-gradient(circle closest-side, var(--sd-ink) 0, var(--sd-ink) 52%, var(--sd-paper) 60%);
}
.sd-option__input:checked + .sd-option__face .sd-option__icon { color: var(--sd-ink); }
.sd-option__input:focus-visible + .sd-option__face {
  outline: 3px solid var(--sd-focus);
  outline-offset: 2px;
}
.sd-option__input:disabled { cursor: not-allowed; }
.sd-option__input:disabled + .sd-option__face {
  border-style: dashed;
  border-color: var(--sd-ink-soft);
  background: var(--sd-paper-2);
  color: var(--sd-ink-soft);
  box-shadow: none;
}
.sd-option__input:disabled + .sd-option__face::before { border-color: var(--sd-ink-soft); background: var(--sd-paper-2); }
.sd-option__input:disabled + .sd-option__face .sd-option__icon { color: var(--sd-ink-soft); }

/* A row holding the main button of a tab or form */
.sd-action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sd-sp-3);
  padding-bottom: 4px;
}

/* 7.5 Swap / Install form --------------------------------------------------- */
.sd-install {
  display: grid;
  gap: var(--sd-sp-4);
  min-width: 0;
}
.sd-install__preview {
  display: grid;
  grid-template-columns: var(--sd-diagram-size-sm) minmax(0, 1fr);
  gap: var(--sd-sp-3);
  align-items: start;
}
.sd-install__plan { margin: 0; line-height: 1.35; }
.sd-install__notes {
  grid-column: 1 / -1;
  display: grid;
  gap: var(--sd-sp-2);
}
.sd-fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}
.sd-fieldset__legend {
  margin-bottom: var(--sd-sp-2);
  padding: 0;
  font-weight: 800;
}

/* 7.6 Phone portrait: diagram beside the observation, specs full width ------ */
/* Both describe the spray, so they pair up, and every spec fits on one line. */
@container sd-viewport (max-width: 599px) {
  .sd-head { grid-template-columns: var(--sd-diagram-size-sm) minmax(0, 1fr); }
  .sd-head__top { display: contents; }
  .sd-head__top > .sd-diagram { grid-column: 1; grid-row: 1; }
  .sd-head > .sd-observe { grid-column: 2; grid-row: 1; align-self: stretch; }
  .sd-head__top > .sd-specs { grid-column: 1 / -1; grid-row: 2; }
  .sd-head__work { grid-column: 1 / -1; grid-row: 3; }
  .sd-adjust .sd-btn { font-size: var(--sd-fs-md); }
}

/* 7.7 Roomier from 600px wide ----------------------------------------------- */
@container sd-viewport (min-width: 600px) {
  .sd-adjust__label { max-width: none; font-size: var(--sd-fs-md); }
  .sd-install__preview .sd-diagram { grid-row: 1 / span 2; }
  .sd-install__notes { grid-column: 2; }
}

/* Desktop and tablets: full-size diagram and body text */
@container sd-viewport (min-width: 600px) and (min-height: 521px) {
  .sd-head { gap: var(--sd-sp-4); }
  .sd-tabs--fit { padding: 0 var(--sd-sp-1); }
  .sd-tabs--fit .sd-tab {
    flex: 0 1 auto;
    padding: 0 var(--sd-sp-4);
    font-size: var(--sd-fs-md);
    letter-spacing: var(--sd-track);
    white-space: nowrap;
  }
  .sd-options { grid-template-columns: repeat(auto-fill, minmax(var(--sd-option-min-lg), 1fr)); }
  .sd-head__top,
  .sd-install__preview {
    grid-template-columns: var(--sd-diagram-size) minmax(0, 1fr);
    gap: var(--sd-sp-4);
  }
  .sd-specs { gap: var(--sd-sp-1) var(--sd-sp-4); font-size: var(--sd-fs-md); }
  .sd-observe { font-size: var(--sd-fs-md); }
  .sd-option__face { font-size: var(--sd-fs-md); }
}

/* Phone landscape: facts on the left, tools on the right */
@container sd-viewport (min-width: 600px) and (max-height: 520px) {
  .sd-head {
    grid-template-columns: minmax(0, var(--sd-head-side)) minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    column-gap: var(--sd-sp-4);
    align-items: start;
  }
  .sd-head__top  { grid-column: 1; grid-row: 1; }
  .sd-observe    { grid-column: 1; grid-row: 2; }
  .sd-head__work { grid-column: 2; grid-row: 1 / span 2; }
  .sd-tabpanel { gap: var(--sd-sp-2); padding-top: var(--sd-sp-2); }
  .sd-adjust { row-gap: var(--sd-sp-2); }
}

/* 7.8 Reduced motion -------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .sd-option__face { transition: none; }
  .sd-option__input:checked + .sd-option__face { transform: none; }
}