/* ================= Theme (dark default) ================= */
:root {
  --text: #f5f7fa;
  --text-2: #d8dde8;
  --muted: rgba(245,247,250,0.62);
  --accent: #0a84ff;
  --accent-ink: #071019;
  --glass: rgba(255,255,255,0.055);
  --glass-strong: rgba(255,255,255,0.09);
  --glass-edge: rgba(255,255,255,0.09);
  --glass-edge-top: rgba(255,255,255,0.22);
  --warn: #e6b84c;
  --warn-tint: rgba(230,184,76,0.10);
  --warn-edge: rgba(230,184,76,0.25);
  --code-bg: rgba(0,0,0,0.26);
  --chip-java: rgba(230,184,76,0.16); --chip-java-fg: #f0d9a0;
  --chip-bed: rgba(10,132,255,0.18);  --chip-bed-fg: #a8d4ef;
  --bg-top: 50% -12%;
  --bg-c1: rgba(20,60,120,0.35);
  --bg-c2: rgba(10,132,255,0.12);
  --bg-base: #0b0f16;
  --header-bg: rgba(11,15,22,0.72);
  --shadow: 0 10px 40px -18px rgba(0,0,0,0.7);

  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --maxw: 780px;
}
/* ================= Theme (light) ================= */
[data-theme="light"] {
  --text: #1d1d1f;
  --text-2: #3a3a3c;
  --muted: rgba(29,29,31,0.62);
  --accent: #007aff;
  --accent-ink: #ffffff;
  --glass: rgba(255,255,255,0.6);
  --glass-strong: rgba(255,255,255,0.85);
  --glass-edge: rgba(0,0,0,0.08);
  --glass-edge-top: rgba(255,255,255,0.9);
  --warn: #b26a00;
  --warn-tint: rgba(230,184,76,0.20);
  --warn-edge: rgba(178,106,0,0.30);
  --code-bg: rgba(0,0,0,0.06);
  --chip-java: rgba(178,106,0,0.12); --chip-java-fg: #8a5a00;
  --chip-bed: rgba(0,122,255,0.12);  --chip-bed-fg: #0055cc;
  --bg-top: 50% -10%;
  --bg-c1: rgba(120,180,255,0.30);
  --bg-c2: rgba(0,122,255,0.10);
  --bg-base: #f4f6f9;
  --header-bg: rgba(244,246,249,0.7);
  --shadow: 0 10px 40px -22px rgba(0,0,0,0.35);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(1200px 600px at var(--bg-top), var(--bg-c1) 0%, transparent 60%),
    radial-gradient(900px 500px at 88% 8%, var(--bg-c2) 0%, transparent 55%),
    var(--bg-base);
  background-attachment: fixed;
  transition: background 300ms var(--ease-out), color 300ms var(--ease-out);
}

.layout { display: flex; flex-direction: column; min-height: 100vh; }
.wrap { flex: 1; width: 100%; max-width: 800px; margin: 0 auto; padding: 44px 28px 96px; }

/* ---------- Top bar (foremost, sticky) ---------- */
.topbar {
  position: sticky; top: 0; z-index: 1000; isolation: isolate;
  display: flex; flex-direction: column; gap: 10px;
  padding: 14px 20px;
  background: var(--header-bg);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  border-bottom: 1px solid var(--glass-edge);
}
.topbar .top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.top-right { display: flex; align-items: center; gap: 10px; }
.topbar .brand { font-size: 1.15rem; font-weight: 650; letter-spacing: -0.01em; }
.topbar .brand a { color: var(--text); text-decoration: none; }
.topbar .brand small { color: var(--muted); font-weight: 500; letter-spacing: 0; font-size: .78rem; margin-left: 6px; }
.theme-toggle {
  cursor: pointer;
  width: 38px; height: 38px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--glass-strong); color: var(--text);
  border: 1px solid var(--glass-edge); border-top-color: var(--glass-edge-top);
  font-size: 1.05rem; line-height: 1; flex-shrink: 0;
}
.player-count {
  font-size: .82rem; font-weight: 600; color: var(--muted);
  padding: 6px 12px; border-radius: 999px;
  background: var(--glass-strong); border: 1px solid var(--glass-edge);
  display: inline-flex; align-items: center; gap: 7px; flex-shrink: 0;
  white-space: nowrap;
}
.player-count::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--muted); flex-shrink: 0;
}
.player-count.on { color: var(--text); }
.player-count.on::before { background: #5ecb6d; box-shadow: 0 0 0 3px rgba(94,203,109,.18); }
.topbar nav { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
.topbar nav a {
  color: var(--muted); text-decoration: none;
  padding: 8px 16px; border-radius: 999px;
  font-size: .92rem; font-weight: 600;
  border: 1px solid transparent;
  transition: color 160ms var(--ease-out), background 160ms var(--ease-out), border-color 160ms var(--ease-out);
}
.topbar nav a:hover { color: var(--text); background: var(--glass); }
.topbar nav a.active { color: var(--text); background: var(--glass-strong); border-color: var(--glass-edge); }

.menu-btn {
  display: none; cursor: pointer; flex-shrink: 0;
  width: 38px; height: 38px; border-radius: 10px;
  align-items: center; justify-content: center;
  background: var(--glass-strong); color: var(--text);
  border: 1px solid var(--glass-edge);
  font-size: 1.1rem; line-height: 1;
}
.scrim { display: none; }

/* ---------- Mobile: hamburger + slide-in sidebar nav ---------- */
@media (max-width: 760px) {
  .menu-btn { display: inline-flex; }
  .topbar nav {
    position: fixed; top: 0; left: 0; height: 100vh;
    width: min(280px, 82vw);
    flex-direction: column; justify-content: flex-start; align-items: stretch;
    gap: 6px; padding: 84px 16px 24px;
    background: var(--header-bg);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-right: 1px solid var(--glass-edge);
    box-shadow: 20px 0 40px -30px rgba(0,0,0,0.7);
    transform: translateX(-100%);
    transition: transform 260ms var(--ease-out);
    z-index: 1002;
    overflow-y: auto;
  }
  .topbar nav.open { transform: translateX(0); }
  .topbar nav a { padding: 12px 16px; border-radius: 10px; font-size: .98rem; }
  .scrim {
    position: fixed; inset: 0; z-index: 1001;
    background: rgba(0,0,0,0.45);
    opacity: 0; pointer-events: none;
    transition: opacity 260ms var(--ease-out);
  }
  .scrim.show { display: block; opacity: 1; pointer-events: auto; }
  .wrap { padding: 24px 18px 80px; }
}

/* ---------- Hero / page heading ---------- */
.hero { padding: 44px 0 8px; text-align: center; }
.hero h1 {
  font-size: clamp(1.9rem, 6vw, 2.7rem);
  font-weight: 650; line-height: 1.05; letter-spacing: -0.02em; font-optical-sizing: auto;
}
.hero p { color: var(--muted); margin-top: 12px; letter-spacing: 0; font-size: 1.02rem; }

/* ---------- Cards / panels ---------- */
.card, section.step {
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-edge);
  border-top-color: var(--glass-edge-top);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.card { padding: 18px; transition: transform 180ms var(--ease-out), border-color 180ms var(--ease-out); }
.card h3 { font-size: 1.02rem; margin-bottom: 8px; letter-spacing: -0.005em; }
.card p, .card li { color: var(--text-2); }
.card .tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.chip {
  font-size: .72rem; font-weight: 600; letter-spacing: .03em;
  padding: 3px 9px; border-radius: 999px;
}
.chip.live { background: rgba(94,208,110,0.16); color: #8fe8a0; }
.chip.wip  { background: var(--warn-tint); color: var(--chip-java-fg); }
[data-theme="light"] .chip.live { background: rgba(52,168,83,0.16); color: #1a7f37; }

.grid { display: grid; grid-template-columns: 1fr; gap: 14px; margin: 24px 0; }
@media (min-width: 640px) { .grid.cols-2 { grid-template-columns: 1fr 1fr; } }

.lead { margin: 22px 0 4px; }
.lead h2 { font-size: 1.3rem; letter-spacing: -0.015em; margin-bottom: 10px; }
.lead p { color: var(--muted); }

/* ---------- CTAs ---------- */
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin: 26px 0 4px; }
button, .btn {
  font-family: inherit; -webkit-tap-highlight-color: transparent; cursor: pointer;
  transition: transform 100ms var(--ease-out), background 160ms var(--ease-out),
              color 160ms var(--ease-out), filter 160ms var(--ease-out), opacity 160ms var(--ease-out);
  text-decoration: none;
}
button:active, .btn:active { transform: scale(0.97); }
.btn {
  display: inline-block; padding: 11px 22px; border-radius: 999px;
  font-size: .95rem; font-weight: 650; border: 1px solid transparent;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { background: var(--glass-strong); color: var(--text); border-color: var(--glass-edge); }
.btn.ghost:hover { border-color: color-mix(in srgb, var(--accent) 50%, transparent); }

button.copy {
  flex-shrink: 0; background: var(--accent); color: var(--accent-ink); border: none;
  padding: 9px 15px; border-radius: 10px; font-weight: 650; font-size: .85rem;
}
button.copy:hover { filter: brightness(1.06); }
button.copy.copied { opacity: .85; }

/* ---------- Address cards ---------- */
.address-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 26px 0; }
@media (max-width: 560px) { .address-cards { grid-template-columns: 1fr; } }
.addr .tag {
  display: inline-block; font-size: .7rem; font-weight: 600; letter-spacing: .04em;
  padding: 3px 9px; border-radius: 999px; margin-bottom: 12px;
}
.tag.java { background: var(--chip-java); color: var(--chip-java-fg); }
.tag.bed { background: var(--chip-bed); color: var(--chip-bed-fg); }
.addr .val { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.addr .val code {
  font-size: clamp(0.95rem, 4vw, 1.08rem); font-weight: 600; color: var(--text);
  background: var(--code-bg); padding: 6px 12px; border-radius: 10px;
  user-select: all; word-break: break-all;
}

.warnbox {
  color: var(--chip-java-fg);
  background: var(--warn-tint);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--warn-edge);
  border-radius: 14px; padding: 13px 16px; font-size: .9rem;
}
.warnbox strong { color: var(--warn); }

/* ---------- Tabs (tutorial) ---------- */
.tabs { display: flex; gap: 6px; margin: 28px 0 2px; flex-wrap: wrap; }
.tabs button {
  background: transparent; color: var(--muted);
  border: 1px solid transparent; padding: 9px 18px; border-radius: 999px;
  font-size: .95rem; font-weight: 600;
}
.tabs button:hover { color: var(--text); background: var(--glass); }
.tabs button.active { background: var(--glass-strong); color: var(--text); border-color: var(--glass-edge); }
.panel { display: none; }
.panel.active { display: block; }

/* ---------- Steps ---------- */
section.step { padding: 20px; margin-top: 14px; }
.step h2 { font-size: 1.06rem; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; letter-spacing: -0.005em; }
.step-num {
  width: 26px; height: 26px; flex-shrink: 0; border-radius: 50%;
  background: var(--accent); color: var(--accent-ink); font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center; font-size: .92rem;
}
.step ol, .step ul { margin-left: 24px; }
.step li { margin: 7px 0; color: var(--text-2); }
.step code, .keycode {
  background: var(--code-bg); border: 1px solid var(--glass-edge);
  padding: 1px 7px; border-radius: 6px; font-size: .92em; word-break: break-all; color: var(--text);
}
.step .path { color: var(--accent); }

.copy-token {
  display: inline-block; margin-top: 8px;
  background: var(--glass-strong); color: var(--text);
  border: 1px solid var(--glass-edge); padding: 9px 15px; border-radius: 10px;
  cursor: pointer; font-size: .85rem; font-weight: 600;
}
.copy-token:hover { border-color: color-mix(in srgb, var(--accent) 55%, transparent); }

/* ---------- Screenshots ---------- */
.shots { display: flex; gap: 14px; margin-top: 20px; flex-wrap: wrap; }
.shots figure { flex: 1 1 150px; max-width: 210px; text-align: center; margin: 0 auto; }
.shots img {
  width: 100%; max-height: 320px; object-fit: contain;
  border: 1px solid var(--glass-edge); border-radius: 14px;
  background: rgba(0,0,0,0.18); box-shadow: var(--shadow);
}
.shots figcaption { color: var(--muted); font-size: .8rem; margin-top: 7px; }

/* ---------- Changelog / Blog ---------- */
.timeline { position: relative; margin: 24px 0; padding-left: 22px; }
.timeline::before {
  content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px;
  width: 2px; background: var(--glass-edge); border-radius: 2px;
}
.timeline .entry { position: relative; margin-bottom: 20px; }
.timeline .entry::before {
  content: ""; position: absolute; left: -22px; top: 7px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px var(--glass);
}
.timeline .entry time { color: var(--muted); font-size: .82rem; letter-spacing: .02em; }
.timeline .entry h3 { font-size: 1.02rem; margin: 2px 0 6px; letter-spacing: -0.005em; }
.timeline .entry ul { margin-left: 20px; }
.timeline .entry li { color: var(--text-2); margin: 4px 0; }

.post .card { margin-bottom: 14px; }
.post .card time { color: var(--muted); font-size: .82rem; }
.post .card h3 { margin: 4px 0 8px; }
.post .card a { color: var(--accent); }

footer { text-align: center; color: var(--muted); margin-top: 44px; font-size: .85rem; }
a { color: var(--accent); }

/* ---------- Hover (fine pointer only) ---------- */
@media (hover: hover) and (pointer: fine) {
  .card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
}

/* ---------- Accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
  .card, section.step, button, .btn, body { transition: none; }
  button:active, .btn:active { transform: none; }
  .card:hover { transform: none; }
}
@media (prefers-reduced-transparency: reduce) {
  :root { --glass: rgba(255,255,255,0.10); --glass-strong: rgba(255,255,255,0.14); --header-bg: #0b0f16; }
  [data-theme="light"] { --glass: rgba(255,255,255,0.9); --glass-strong: #fff; --header-bg: #f4f6f9; }
  .topbar, .card, .warnbox, section.step, .copy-token { backdrop-filter: none; -webkit-backdrop-filter: none; }
}
@media (prefers-contrast: more) {
  .card, section.step, .warnbox { border-color: color-mix(in srgb, var(--text) 30%, transparent); }
}