/* Lollipop Links - line-based, triangular. No external fonts or assets. */

:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --ink: #14151a;
  --muted: #565a66;
  --rule: #14151a;
  --hair: #d8d6cd;
  --mesh: #e3e1d9;
  --hover: #efede6;
  --accent: #d6215f;
  --accent-ink: #ffffff;
  --focus: #1c5fd6;
  --warn: #8a4b00;
  --checker: #e6e4dc;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0d0e11;
  --surface: #14161b;
  --ink: #f0f0ec;
  --muted: #a1a5b0;
  --rule: #e9e9e4;
  --hair: #2d3039;
  --mesh: #1b1d24;
  --hover: #1d2027;
  --accent: #ff5c93;
  --accent-ink: #0d0e11;
  --focus: #8ab6ff;
  --warn: #ffb454;
  --checker: #262932;
  color-scheme: dark;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  display: flex;
  flex-direction: column;
}

[hidden] { display: none !important; }

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip {
  position: absolute; left: 16px; top: -60px; z-index: 50;
  background: var(--ink); color: var(--bg); padding: 8px 14px; text-decoration: none;
}
.skip:focus { top: 8px; }

a { color: inherit; text-underline-offset: 3px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* triangular line mesh */
.mesh {
  position: fixed; inset: 0; width: 100%; height: 100%; z-index: -1;
  pointer-events: none;
}
.mesh path { stroke: var(--mesh); stroke-width: 1; }

/* header */
.top {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1040px; margin: 0 auto; padding: 16px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.1rem; letter-spacing: .01em; text-decoration: none;
}
.brand-mark { color: var(--accent); }

/* hero */
main { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 16px 32px; flex: 1; }

.hero { padding: 16px 0 24px; max-width: 640px; }
.hero h1 {
  margin: 0 0 8px; font-size: clamp(1.9rem, 5.5vw, 3rem); line-height: 1.1; letter-spacing: -.02em;
}
.hero h1 span { color: var(--accent); white-space: nowrap; }
.hero p { margin: 0; color: var(--muted); font-size: 1.05rem; }

/* layout */
.workspace {
  display: grid; gap: 16px;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "input" "preview" "custom";
}
.area-input { grid-area: input; }
.area-preview { grid-area: preview; }
.area-custom { grid-area: custom; }

@media (min-width: 860px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr) 380px;
    grid-template-areas: "input preview" "custom preview";
    align-items: start;
  }
  .area-preview { position: sticky; top: 16px; }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 20px;
  position: relative;
}
/* chamfered corner marker */
.panel::after {
  content: ""; position: absolute; top: -1px; right: -1px; width: 22px; height: 22px;
  background: linear-gradient(to bottom left, var(--bg) 0 49%, var(--rule) 49% 53%, transparent 53%);
  pointer-events: none;
}

/* form controls */
.lbl, legend, .color-row label, .range-row label {
  display: block; font-size: .85rem; font-weight: 600; color: var(--muted);
  margin: 14px 0 6px; padding: 0;
}
.pane > .lbl:first-child { margin-top: 18px; }

input[type="text"], input[type="email"], input[type="tel"], textarea, select {
  width: 100%; font: inherit; color: var(--ink); background: var(--surface);
  border: 1px solid var(--rule); border-radius: 0; padding: 11px 12px; min-height: 44px;
}
textarea { resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--muted); opacity: .8; }
input[aria-invalid="true"] { border-color: var(--warn); border-width: 2px; }
#f-url { font-size: 1.05rem; }

fieldset { border: 0; margin: 0 0 4px; padding: 0; min-width: 0; }
fieldset + fieldset { margin-top: 16px; }
fieldset + fieldset > legend { border-top: 1px solid var(--hair); width: 100%; padding-top: 14px; margin-top: 0; }

.check { display: flex; align-items: center; gap: 10px; margin: 10px 0; cursor: pointer; font-size: .95rem; }
input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); margin: 0; flex: none; }
input[type="range"] { width: 100%; accent-color: var(--accent); min-height: 32px; }

/* segmented radio buttons */
.seg { display: flex; flex-wrap: wrap; border: 1px solid var(--rule); width: max-content; max-width: 100%; margin: 0; padding: 0; }
.seg label { position: relative; flex: 1 1 auto; cursor: pointer; margin: 0; }
.seg label + label { border-left: 1px solid var(--rule); }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span { display: block; padding: 9px 14px; text-align: center; font-size: .92rem; min-height: 40px; line-height: 22px; }
.seg input:checked + span { background: var(--ink); color: var(--bg); font-weight: 600; }
.seg input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.seg label:hover input:not(:checked) + span { background: var(--hover); }
.seg.small span { padding: 7px 11px; min-height: 36px; line-height: 22px; font-size: .88rem; }
fieldset.seg { margin-bottom: 0; }

/* buttons */
.btn {
  font: inherit; font-weight: 600; color: var(--ink); background: transparent;
  border: 1px solid var(--rule); border-radius: 0; padding: 10px 16px; min-height: 44px;
  cursor: pointer; text-align: center;
}
.btn:hover:not(:disabled) { background: var(--hover); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--accent); }
.btn.icon { padding: 0; width: 44px; display: inline-grid; place-items: center; }
.btn.wide { flex: 1 1 100%; }

.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.actions .btn { flex: 1 1 0; min-width: 0; }
.actions .btn.wide { flex: 1 1 100%; }

#theme-toggle .i-moon { display: none; }
:root[data-theme="dark"] #theme-toggle .i-moon { display: block; }
:root[data-theme="dark"] #theme-toggle .i-sun { display: none; }

/* preview stage */
.stage {
  display: grid; place-items: center; aspect-ratio: 1; width: 100%;
  border: 1px solid var(--hair); background: var(--surface); padding: 12px;
}
.stage.checker {
  background-color: var(--surface);
  background-image:
    linear-gradient(45deg, var(--checker) 25%, transparent 25% 75%, var(--checker) 75%),
    linear-gradient(45deg, var(--checker) 25%, transparent 25% 75%, var(--checker) 75%);
  background-size: 20px 20px; background-position: 0 0, 10px 10px;
}
#qr { width: 100%; height: 100%; max-width: 100%; object-fit: contain; display: block; }
.empty { text-align: center; color: var(--muted); }
.empty svg { color: var(--hair); stroke: var(--muted); opacity: .6; }
.empty p { margin: 8px 0 0; }

.note { margin: 10px 0 0; font-size: .9rem; color: var(--muted); min-height: 1.4em; }
.note:empty { min-height: 0; margin: 0; }
.note.warn { color: var(--warn); font-weight: 600; }
.note.subtle, .subtle { font-size: .82rem; color: var(--muted); }
#hint:empty { display: none; }

/* customise */
summary {
  list-style: none; cursor: pointer; display: flex; align-items: baseline; gap: 12px;
  font-weight: 700; font-size: 1.05rem; padding: 2px 0;
}
summary::-webkit-details-marker { display: none; }
summary::before {
  content: ""; width: 0; height: 0; align-self: center; flex: none;
  border-left: 9px solid var(--accent); border-top: 6px solid transparent; border-bottom: 6px solid transparent;
  transition: transform .15s;
}
details[open] > summary::before { transform: rotate(90deg); }
summary small { color: var(--muted); font-weight: 400; font-size: .85rem; }
#style-form { margin-top: 12px; }

.presets { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; margin-top: 6px; }
.preset {
  font: inherit; font-size: .85rem; color: var(--ink); background: transparent; cursor: pointer;
  border: 1px solid var(--hair); padding: 8px; min-height: 44px; display: flex; align-items: center; gap: 8px; text-align: left;
}
.preset:hover { border-color: var(--rule); background: var(--hover); }
.preset i { width: 26px; height: 26px; flex: none; border: 1px solid var(--hair); display: grid; place-items: center; }
.preset i b { width: 16px; height: 16px; clip-path: polygon(50% 0, 100% 100%, 0 100%); }

.color-row { display: grid; grid-template-columns: 1fr 44px 96px; gap: 8px; align-items: center; margin: 6px 0; }
.color-row label { margin: 0; }
.color-row input[type="color"] {
  width: 44px; height: 44px; padding: 2px; border: 1px solid var(--rule); background: var(--surface); border-radius: 0; cursor: pointer;
}
.color-row input:disabled { opacity: .4; cursor: not-allowed; }
.hex { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; padding: 11px 8px !important; }

.range-row { display: grid; grid-template-columns: 90px 1fr 44px; gap: 8px; align-items: center; margin: 8px 0; }
.range-row label { margin: 0; }
.range-row output { font-variant-numeric: tabular-nums; text-align: right; font-size: .9rem; color: var(--muted); }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid2 .lbl { margin-top: 8px; }

.logo-row { display: flex; gap: 8px; align-items: stretch; margin-top: 6px; }
.drop {
  position: relative; flex: 1; display: flex; align-items: center; gap: 12px;
  border: 1px dashed var(--rule); padding: 10px 12px; min-height: 56px; cursor: pointer; color: var(--muted); font-size: .92rem;
}
.drop:hover, .drop.over { background: var(--hover); border-style: solid; }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.drop:focus-within { outline: 3px solid var(--focus); outline-offset: 2px; }
.drop img { width: 36px; height: 36px; object-fit: contain; flex: none; }
.drop span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }

#btn-reset { margin-top: 16px; width: 100%; }

/* page-wide drop overlay */
.drop-overlay {
  position: fixed; inset: 12px; z-index: 40; display: grid; place-items: center; pointer-events: none;
  border: 2px dashed var(--accent); background: color-mix(in srgb, var(--bg) 88%, transparent);
  font-size: 1.4rem; font-weight: 700;
}

/* dialog */
dialog {
  width: min(440px, calc(100vw - 32px)); border: 1px solid var(--rule); border-radius: 0;
  background: var(--surface); color: var(--ink); padding: 22px;
}
dialog::backdrop { background: rgba(0, 0, 0, .55); }
dialog h2 { margin: 0 0 6px; font-size: 1.2rem; }
dialog .note { min-height: 0; }

/* footer */
.foot { text-align: center; padding: 20px 16px 28px; color: var(--muted); font-size: .9rem; }
.foot p { margin: 4px 0; }

@media (max-width: 420px) {
  .panel { padding: 16px; }
  .color-row { grid-template-columns: 1fr 44px 88px; }
  .range-row { grid-template-columns: 74px 1fr 36px; }
  .grid2 { grid-template-columns: 1fr; }
  .seg span { padding: 9px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

@media (forced-colors: active) {
  .btn.primary, .seg input:checked + span { forced-color-adjust: none; background: Highlight; color: HighlightText; }
}