/* Rubik Lab — design system. Swiss/editorial, giấy sáng, hairline, control nhỏ.
   Một chiến lược depth duy nhất: hairline border. Một hệ radius: 6px.
   Màu sticker: MoYu stickerless (token --stk-*, đo từ ảnh sản phẩm). */

:root {
  /* nền giấy trung tính (chroma thấp, một họ gray ấm nhẹ) */
  --paper: #f4f4f1;
  --surface: #fcfcfa;
  --ink: #1e1d19;
  --ink-2: #55534b;
  --ink-3: #767369;
  --line: #e3e2db;
  --line-strong: #c9c7bd;
  --accent: #2e59d6;      /* cobalt — link, focus, trạng thái active */
  --accent-ink: #23439c;
  --ok: #2f7d4f;
  --warn: #b3532c;

  /* sticker MoYu stickerless half-bright — đo pixel từ 4 ảnh RS3M 2020/WeiLong WR M
     (median ~25k px); white/blue nâng sáng bù bias ảnh chụp theo khuyến nghị đo */
  --stk-U: #f0f2f4;
  --stk-D: #f1e001;
  --stk-F: #50ca2f;
  --stk-B: #1273c0;
  --stk-R: #d94540;
  --stk-L: #ef9628;
  --stk-void: #d9d7cd;    /* ô "không tính" trong diagram OLL */

  /* phase palette (mờ hơn sticker, dùng cho phase bar) */
  --ph-cross: #5872c9;
  --ph-f2l: #58a06f;
  --ph-oll: #cfa843;
  --ph-pll: #c05f56;

  --display: "Archivo", "Libre Franklin", sans-serif;
  --body: "Libre Franklin", "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", Consolas, monospace;

  --ease: cubic-bezier(0.25, 1, 0.5, 1);
}

* { box-sizing: border-box; }
html { height: 100%; }
body {
  margin: 0; min-height: 100%;
  background: var(--paper); color: var(--ink);
  font: 400 15px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--display); font-stretch: 112%; line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: 23px; font-weight: 600; }
h2 { font-size: 16px; font-weight: 600; }
p { text-wrap: pretty; }
a { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }
code, .mono { font-family: var(--mono); font-size: 13px; }

/* ---- nav ---- */
.nav {
  display: flex; align-items: center; gap: 12px 24px; flex-wrap: wrap;
  min-height: 56px; padding: 8px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.nav .wordmark {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--display); font-stretch: 118%; font-weight: 600; font-size: 15px;
  color: var(--ink); text-decoration: none; letter-spacing: 0.01em;
}
.nav .links { display: flex; gap: 4px 16px; margin-left: 16px; flex-wrap: wrap; }
.nav .links a {
  font-size: 13px; color: var(--ink-2); text-decoration: none; padding: 4px 2px;
  border-bottom: 1px solid transparent;
}
.nav .links a:hover { color: var(--ink); border-bottom-color: var(--line-strong); }
.nav .links a.active { color: var(--ink); border-bottom-color: var(--ink); }

main { max-width: 1200px; margin: 0 auto; padding: 24px; }
.page-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin: 8px 0 20px; }
.page-head .sub { color: var(--ink-3); font-size: 13px; }

/* ---- controls: nhỏ, lặng ---- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 30px; padding: 0 12px;
  font: 500 13px/1 var(--body); color: var(--ink);
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: 6px;
  cursor: pointer; transition: border-color 150ms var(--ease), transform 100ms var(--ease);
  position: relative;
}
.btn::before { content: ""; position: absolute; inset: -8px; } /* touch target */
.btn:hover { border-color: var(--ink-2); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.primary:hover { background: #33312b; }
.btn:disabled { opacity: 0.45; cursor: default; transform: none; }
.btn:focus-visible, a:focus-visible, select:focus-visible, textarea:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px;
}

select, input[type="text"] {
  height: 30px; padding: 0 8px; font: 400 13px var(--body);
  color: var(--ink); background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: 6px;
}
textarea {
  width: 100%; padding: 8px 10px;
  font: 400 13px/1.7 var(--mono); color: var(--ink);
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: 6px;
  resize: vertical;
}
label.field { display: block; font-size: 12px; color: var(--ink-3); margin: 0 0 4px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.chiplink { /* preset dạng text, không phải nút to */
  font-size: 13px; color: var(--accent-ink); background: none; border: none; padding: 2px 0;
  cursor: pointer; text-decoration: underline; text-underline-offset: 3px;
}
.chiplink:hover { color: var(--accent); }

/* ---- panel & bảng ---- */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; }
.panel.pad { padding: 16px; }
table.data { width: 100%; border-collapse: collapse; font-size: 13px; }
table.data th {
  text-align: left; font-weight: 500; color: var(--ink-3); font-size: 12px;
  padding: 6px 10px; border-bottom: 1px solid var(--line-strong);
}
table.data td { padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data tr:last-child td { border-bottom: none; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---- phase bar ---- */
.phasebar { display: flex; height: 4px; border-radius: 2px; overflow: hidden; gap: 2px; }
.phasebar span { display: block; height: 100%; }
.legend { display: flex; gap: 12px; font-size: 12px; color: var(--ink-3); flex-wrap: wrap; }
.legend i { display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 4px; }

/* ---- thẻ case ---- */
.case-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: 12px; }
.case-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 6px;
  padding: 12px; cursor: pointer; text-align: left;
  transition: border-color 150ms var(--ease), transform 100ms var(--ease);
}
.case-card:hover { border-color: var(--ink-2); transform: translateY(-1px); }
.case-card svg { width: 100%; height: auto; display: block; margin-bottom: 8px; }
.case-card .cid { font-size: 13px; font-weight: 600; }
.case-card .cname { font-size: 11.5px; color: var(--ink-3); min-height: 16px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.case-card .calg { font-family: var(--mono); font-size: 11px; color: var(--ink-2); margin-top: 6px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.case-card.known { border-color: var(--line); background: var(--paper); opacity: 0.62; }
.knowmark {
  float: right; width: 16px; height: 16px; border: 1px solid var(--line-strong); border-radius: 50%;
  background: none; cursor: pointer; padding: 0; position: relative;
}
.knowmark::before { content: ""; position: absolute; inset: -8px; }
.knowmark.on { background: var(--ok); border-color: var(--ok); }

/* ---- badges mốc ---- */
.hit { display: inline-block; font-size: 11px; color: var(--ok); border: 1px solid color-mix(in srgb, var(--ok) 35%, var(--line)); border-radius: 4px; padding: 0 6px; margin: 1px 2px 1px 0; background: color-mix(in srgb, var(--ok) 6%, var(--surface)); }
.status { font-size: 13px; color: var(--ink-3); min-height: 20px; }
.status.err { color: var(--warn); }

/* ---- tabs dạng underline ---- */
.tabs { display: flex; gap: 16px; border-bottom: 1px solid var(--line); margin-bottom: 16px; }
.tabs button {
  background: none; border: none; padding: 8px 2px; font: 500 13px var(--body);
  color: var(--ink-3); cursor: pointer; border-bottom: 1.5px solid transparent; margin-bottom: -1px;
}
.tabs button:hover { color: var(--ink); }
.tabs button.active { color: var(--ink); border-bottom-color: var(--ink); }

/* ---- dialog ---- */
dialog {
  border: 1px solid var(--line-strong); border-radius: 6px; background: var(--surface);
  padding: 20px; max-width: 560px; width: calc(100vw - 48px); color: var(--ink);
}
dialog::backdrop { background: rgba(30, 29, 25, 0.35); }

/* ---- player khung ---- */
.player-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 8px; }
twisty-player { width: 100%; }

/* layout 2 cột co giãn */
.split { display: grid; grid-template-columns: minmax(300px, 400px) 1fr; gap: 20px; align-items: start; }
@media (max-width: 800px) { .split { grid-template-columns: 1fr; } }

/* kết quả + player sticky cạnh nhau (solver) */
.result-grid { display: grid; grid-template-columns: 1fr minmax(340px, 440px); gap: 16px; align-items: start; }
.result-grid .side { position: sticky; top: 16px; }
@media (max-width: 980px) { .result-grid { grid-template-columns: 1fr; } .result-grid .side { position: static; } }

/* khối gập */
details.fold { border: 1px solid var(--line); border-radius: 6px; background: var(--surface); padding: 0 12px; }
details.fold summary { cursor: pointer; font-size: 13px; color: var(--ink-2); padding: 8px 0; list-style-position: inside; }
details.fold[open] { padding-bottom: 10px; }
tr[data-line] { cursor: pointer; }
tr[data-line]:hover td { background: color-mix(in srgb, var(--accent) 4%, transparent); }

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