/* ==========================================================================
   hub.css — trang chủ: màn hình chào (welcome) + thư viện game (library).
   Dùng lại token màu trong base.css.
   ========================================================================== */

[data-view][hidden] { display: none !important; }

/* ---------- Màn hình chào ---------- */
.welcome {
  position: relative; min-height: 100vh; min-height: 100svh; overflow: hidden;
  display: flex; flex-direction: column;
  background:
    radial-gradient(900px 480px at 12% -8%, var(--glow), transparent 65%),
    radial-gradient(800px 460px at 100% 12%, color-mix(in srgb, var(--good) 12%, transparent), transparent 65%),
    var(--bg);
}
/* Lưới kỹ thuật mờ dần xuống dưới */
.welcome::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
}
.welcome .bits-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.welcome .bits-bg span {
  position: absolute; bottom: -2em; font-family: var(--mono); font-weight: 700; color: var(--accent);
  opacity: 0; animation: bit-rise linear infinite;
}
@keyframes bit-rise {
  0% { transform: translateY(0); opacity: 0; }
  15% { opacity: var(--o, 0.18); }
  85% { opacity: var(--o, 0.18); }
  100% { transform: translateY(-110vh); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .welcome .bits-bg span { animation: none; opacity: var(--o, 0.15); bottom: auto; top: var(--y, 50%); }
}
.welcome-top { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 18px clamp(16px, 4vw, 40px); }
.welcome-top .brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.01em; }
.welcome-top .tools { display: flex; gap: 8px; }
.logo {
  font-family: var(--mono); font-weight: 700; color: var(--on-accent); flex: none;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, #0ea5e9));
  border-radius: 10px; padding: 4px 8px; font-size: 0.82rem; letter-spacing: 0.02em; box-shadow: 0 4px 14px var(--glow);
}

.welcome-body {
  position: relative; display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: clamp(36px, 9vh, 90px) 16px 36px; max-width: 820px; margin: 0 auto; width: 100%;
}
.welcome .kicker {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 20px; padding: 5px 14px; border-radius: 999px;
  font-family: var(--mono); color: var(--accent); font-weight: 700; letter-spacing: 0.14em; font-size: 0.8rem;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}
.welcome .kicker::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 3px color-mix(in srgb, var(--good) 25%, transparent); }
.welcome h1 {
  font-size: clamp(2.2rem, 7vw, 4rem); line-height: 1.08; margin-bottom: 18px; letter-spacing: -0.03em; font-weight: 800;
}
.welcome .lead { color: var(--muted); font-size: clamp(1rem, 2.4vw, 1.18rem); max-width: 620px; margin: 0 auto 26px; }
.welcome .stats { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 30px; }
.welcome .stats .stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 7px 16px;
  font-size: 0.9rem; color: var(--muted); box-shadow: var(--shadow);
}
.welcome .stats .stat b { color: var(--text); font-family: var(--mono); font-size: 1.05rem; margin-right: 6px; }
.welcome .actions { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.welcome .actions .btn.lg { min-width: 240px; font-size: 1.1rem; padding: 16px 34px; box-shadow: 0 10px 28px var(--glow); }
.welcome .continue { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.welcome .reset-link {
  background: none; border: 0; color: var(--muted); font: inherit; font-size: 0.86rem; cursor: pointer;
  text-decoration: underline; text-underline-offset: 3px; padding: 6px; margin-top: 4px;
}
.welcome .reset-link:hover { color: var(--bad); }

/* Các chương, xem nhanh trên màn hình chào */
.welcome-topics {
  position: relative; width: 100%; max-width: 1100px; margin: 0 auto; padding: 8px 16px 36px;
  display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(195px, 1fr));
}
.topic-tile {
  display: flex; flex-direction: column; gap: 6px; text-align: left; text-decoration: none; color: var(--text);
  background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: blur(6px);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
  transition: transform 0.14s, border-color 0.14s, box-shadow 0.14s;
}
.topic-tile:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow-lg); }
.topic-tile .lbl { font-family: var(--mono); font-size: 0.72rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.topic-tile h3 { margin: 0; font-size: 1rem; line-height: 1.35; }
.topic-tile .sum { color: var(--muted); font-size: 0.85rem; line-height: 1.5; margin: 0; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.topic-tile .meta { display: flex; align-items: center; gap: 10px; margin-top: 8px; font-size: 0.8rem; color: var(--muted); font-family: var(--mono); }
.topic-tile .meta .meter { flex: 1; }
.welcome-foot { position: relative; text-align: center; color: var(--muted); font-size: 0.84rem; padding: 0 16px 24px; margin-top: auto; }

/* ---------- Thư viện game ---------- */
.lib-header {
  position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.4); border-bottom: 1px solid var(--border);
}
.lib-header .inner { display: flex; align-items: center; gap: 12px; min-height: 62px; }
.lib-header .home { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 800; letter-spacing: -0.01em; min-width: 0; }
.lib-header .home span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#lib-lang { display: flex; gap: 8px; }
.wide { max-width: 1240px; }

.library { display: grid; grid-template-columns: 264px minmax(0, 1fr); gap: 32px; padding-top: 26px; padding-bottom: 56px; align-items: start; }

/* Cột chương */
.chapters { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 4px; max-height: calc(100vh - 104px); overflow-y: auto; padding-right: 4px; scrollbar-width: thin; }
.chapters .head { font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); font-weight: 700; margin: 0 0 8px 12px; }
.chap {
  position: relative; display: flex; flex-direction: column; gap: 5px; text-align: left; width: 100%;
  background: transparent; border: 1px solid transparent; border-radius: 12px;
  padding: 10px 12px; color: var(--text); font: inherit; cursor: pointer; transition: background 0.12s, border-color 0.12s;
}
.chap:hover { background: var(--surface); border-color: var(--border); }
.chap[aria-current="true"] { background: var(--surface); border-color: var(--border); box-shadow: var(--shadow); }
.chap[aria-current="true"]::before { content: ""; position: absolute; left: -1px; top: 12px; bottom: 12px; width: 3px; border-radius: 3px; background: var(--accent); }
.chap .l1 { display: flex; align-items: center; gap: 8px; }
.chap .lbl { font-family: var(--mono); font-size: 0.68rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.chap .nm { font-weight: 600; font-size: 0.92rem; line-height: 1.35; }
.chap[aria-current="true"] .nm { font-weight: 700; }
.chap .cnt { margin-left: auto; font-family: var(--mono); font-size: 0.76rem; color: var(--muted); }
.meter { height: 5px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.meter > span { display: block; height: 100%; background: linear-gradient(90deg, var(--good), color-mix(in srgb, var(--good) 60%, var(--accent))); border-radius: 99px; transition: width 0.3s; }

/* Thanh công cụ */
.toolbar { display: flex; flex-direction: column; gap: 12px; margin-bottom: 22px; }
.search { position: relative; }
.search input {
  width: 100%; font: inherit; font-size: 1rem; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 14px; padding: 13px 48px 13px 46px; box-shadow: var(--shadow);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.search input::placeholder { color: var(--muted); opacity: 0.8; }
.search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.search .ic { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; font-size: 0.95rem; }
.search kbd { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); }
.search .clear { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); border: 0; background: var(--surface-2); color: var(--muted); width: 28px; height: 28px; border-radius: 8px; cursor: pointer; font-size: 0.85rem; }
.search .clear:hover { color: var(--text); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  font: inherit; font-size: 0.86rem; font-weight: 600; cursor: pointer; white-space: nowrap;
  background: var(--surface); color: var(--muted); border: 1px solid var(--border); border-radius: 10px; padding: 6px 13px;
  display: inline-flex; align-items: center; gap: 7px; transition: border-color 0.12s, color 0.12s, background 0.12s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.chip .n { font-family: var(--mono); font-size: 0.74rem; opacity: 0.8; }
.chip:disabled { opacity: 0.45; cursor: default; }
.chip:disabled:hover { border-color: var(--border); color: var(--muted); }
.chips-label { font-size: 0.8rem; color: var(--muted); font-weight: 600; margin-right: 2px; align-self: center; }

/* Tiêu đề chương / mục trong kết quả */
.topic-block { margin-bottom: 40px; }
.topic-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding-bottom: 12px; margin-bottom: 2px; border-bottom: 1px solid var(--border); }
.topic-head h2 { margin: 0; font-size: 1.45rem; letter-spacing: -0.02em; }
.topic-head .badge { font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.06em; }
.topic-head p { margin: 0; color: var(--muted); width: 100%; font-size: 0.95rem; }
.section-title { margin: 24px 0 14px; font-family: var(--mono); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); font-weight: 700; display: flex; gap: 10px; align-items: center; }
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); order: 1; }
.section-title .badge { order: 2; }
.result-info { color: var(--muted); font-size: 0.9rem; margin: -4px 0 16px; }

/* Thẻ game */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.game-card { display: flex; flex-direction: column; gap: 8px; text-decoration: none; color: inherit; padding: 18px; transition: transform 0.14s, border-color 0.14s, box-shadow 0.14s; }
a.game-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow-lg); }
.game-card .top { display: flex; align-items: center; gap: 12px; }
.game-card .ic {
  font-size: 1.6rem; width: 48px; height: 48px; display: grid; place-items: center; flex: none; border-radius: 14px;
  background: linear-gradient(145deg, var(--accent-soft), var(--surface-2)); border: 1px solid var(--border);
}
.game-card h3 { margin: 0; line-height: 1.3; }
.game-card .skill { font-size: 0.78rem; color: var(--accent); font-weight: 600; margin-top: 1px; }
.game-card p { font-size: 0.9rem; color: var(--muted); margin: 0; flex: 1; line-height: 1.55; }
.game-card .foot { display: flex; gap: 10px; align-items: center; margin-top: 8px; padding-top: 12px; border-top: 1px solid var(--border); font-size: 0.85rem; }
.game-card .foot .meter { flex: 1; }
.game-card.planned { opacity: 0.6; box-shadow: none; border-style: dashed; }
.game-card.done { border-color: color-mix(in srgb, var(--good) 45%, var(--border)); }
mark { background: var(--warn-soft); color: inherit; border-radius: 3px; padding: 0 1px; }

/* Chơi gần đây */
.recent { margin-bottom: 8px; }
.recent .section-title { margin-top: 0; }
.recent-list { display: flex; gap: 12px; overflow-x: auto; padding: 2px 2px 10px; scrollbar-width: thin; }
.recent-item {
  flex: none; display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 9px 16px 9px 9px; max-width: 290px; box-shadow: var(--shadow);
  transition: border-color 0.12s, transform 0.12s;
}
.recent-item:hover { border-color: var(--accent); transform: translateY(-1px); }
.recent-item .ic { font-size: 1.3rem; width: 40px; height: 40px; display: grid; place-items: center; background: var(--accent-soft); border-radius: 11px; flex: none; }
.recent-item b { display: block; font-size: 0.92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.recent-item small { color: var(--muted); font-size: 0.78rem; }

.empty { text-align: center; padding: 56px 16px; color: var(--muted); border: 1px dashed var(--border); border-radius: var(--radius); }
.empty .big { font-size: 2.4rem; margin-bottom: 8px; }

.lib-foot { border-top: 1px solid var(--border); padding: 22px 0 44px; color: var(--muted); font-size: 0.88rem; }
.lib-foot .container { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* Hộp thoại xác nhận xoá */
dialog.confirm { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); padding: 24px; max-width: min(440px, calc(100vw - 32px)); box-shadow: var(--shadow-lg); }
dialog.confirm::backdrop { background: rgb(10 12 25 / 0.55); backdrop-filter: blur(3px); }
dialog.confirm .row { justify-content: flex-end; margin-top: 18px; }

/* ---------- Màn hình hẹp: cột chương thành hàng chip cuộn ngang ---------- */
@media (max-width: 820px) {
  .library { grid-template-columns: minmax(0, 1fr); gap: 14px; padding-top: 16px; }
  .chapters {
    position: static; flex-direction: row; overflow-x: auto; max-height: none; padding: 0 0 6px; gap: 8px;
    scrollbar-width: thin; margin: 0 -16px; padding-left: 16px; padding-right: 16px;
  }
  .chapters .head { display: none; }
  .chap { flex: none; width: auto; max-width: 240px; background: var(--surface); border-color: var(--border); padding: 7px 12px; }
  .chap[aria-current="true"] { border-color: var(--accent); }
  .chap[aria-current="true"]::before { display: none; }
  .chap .nm { font-size: 0.86rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .chap .meter { display: none; }
  .search kbd { display: none; }
  .chips.scroll { flex-wrap: nowrap; overflow-x: auto; margin: 0 -16px; padding: 0 16px 4px; scrollbar-width: thin; }
  .welcome-top .brand span:last-child { display: none; }
}

/* Đăng nhập đồng bộ (sync.js) */
.sync-btn { width: auto; padding: 0 12px; font-size: 0.85rem; white-space: nowrap; }
.auth-form { display: grid; gap: 10px; margin-top: 12px; }
.auth-form input { font: inherit; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); color: var(--text); }
.auth-form input:focus { outline: 2px solid var(--accent); border-color: transparent; }
.auth-form .row { display: flex; gap: 8px; justify-content: flex-end; flex-wrap: wrap; }
.auth-msg { min-height: 1.2em; margin: 0; }
.mode-pick { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0; }
.mode-opt { display: grid; gap: 4px; text-align: left; font: inherit; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); color: var(--text); cursor: pointer; }
.mode-opt.on { border-color: var(--accent); outline: 2px solid var(--accent); }
.mode-opt small { color: var(--muted, inherit); }
.oauth-btn { width: 100%; margin-bottom: 8px; }