:root{
  --navy:#0f2238; --navy2:#1b3a5b; --accent:#2f6df6; --ink:#0b1726;
  --bar:#f4f6f9; --line:#d7dde6;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden;background:#0f2238;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink)}

/* ---- Full-bleed browser frame ---- */
.frame{position:fixed;inset:0;display:flex;flex-direction:column;background:#fff}
.frame-bar{display:flex;align-items:center;gap:8px;height:40px;flex:none;padding:0 14px;
  background:var(--bar);border-bottom:1px solid var(--line);z-index:20}
.dot{width:12px;height:12px;border-radius:50%}
.dot.red{background:#ff5f57}.dot.amber{background:#febc2e}.dot.green{background:#28c840}
.addr{flex:0 1 520px;margin-left:10px;height:26px;display:flex;align-items:center;gap:8px;
  padding:0 12px;background:#fff;border:1px solid var(--line);border-radius:14px;color:#5b6b7f;font-size:13px}
.addr .lock{font-size:11px;filter:grayscale(1);opacity:.7}
.brand{margin-left:auto;font-weight:800;letter-spacing:.5px;color:var(--navy);font-size:13px}
.brand span{font-weight:500;color:#7c8aa0;margin-left:3px}

/* ---- Stage / replay (fills remaining space) ---- */
.stage{position:relative;flex:1;background:#f5f7fa;overflow:hidden}
#player{position:absolute;left:50%;top:50%;transform-origin:center center}
#player iframe{border:0;background:#fff}
#overlay{position:absolute;left:50%;top:50%;transform-origin:center center;pointer-events:none;z-index:30}

/* ---- Hotspot ---- */
.hotspot{position:absolute;width:30px;height:30px;margin:-15px 0 0 -15px;border-radius:50%;
  background:rgba(47,109,246,.9);border:3px solid #fff;box-shadow:0 0 0 3px rgba(47,109,246,.4),0 4px 12px rgba(0,0,0,.3);
  cursor:pointer;pointer-events:auto;z-index:32;animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(47,109,246,.55),0 4px 12px rgba(0,0,0,.3)}
  70%{box-shadow:0 0 0 22px rgba(47,109,246,0),0 4px 12px rgba(0,0,0,.3)}
  100%{box-shadow:0 0 0 0 rgba(47,109,246,0),0 4px 12px rgba(0,0,0,.3)}}

/* ---- Tooltip ---- */
.tip{position:absolute;width:300px;background:var(--navy);color:#fff;border-radius:10px;
  padding:14px 16px;box-shadow:0 12px 30px rgba(8,18,33,.4);z-index:33;pointer-events:auto;
  font-size:15px;line-height:1.45}
.tip h3{margin:0 0 5px;font-size:15px;font-weight:700;color:#cfe0ff}
.tip p{margin:0;font-size:14px;color:#e7eefb}
.tip .tip-go{margin-top:12px;display:flex;align-items:center;gap:10px}
.tip .tip-go button{background:var(--accent);color:#fff;border:0;border-radius:7px;padding:7px 14px;font-size:13px;font-weight:600;cursor:pointer}
.tip .tip-n{font-size:12px;color:#8ea6c8}
.tip:after{content:"";position:absolute;width:0;height:0;border:8px solid transparent}
.tip.below:after{bottom:100%;left:24px;border-bottom-color:var(--navy)}
.tip.above:after{top:100%;left:24px;border-top-color:var(--navy)}

/* ---- Card screens (intro/outro/loading) ---- */
.card-screen{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(15,34,56,.97),rgba(27,58,91,.97));z-index:50}
.card-screen.hidden{display:none}
.card{max-width:560px;text-align:center;color:#fff;padding:28px}
.card-logo{font-weight:800;letter-spacing:1px;font-size:18px;margin-bottom:18px;color:#fff}
.card-logo span{font-weight:500;color:#9db4d6;margin-left:4px}
.card h1{font-size:32px;margin:0 0 12px;font-weight:700}
.card p{font-size:16px;line-height:1.5;color:#d6e1f2;margin:0 0 8px}
.card .hint{font-size:13px;color:#8ea6c8;margin-top:18px}
.btn-primary{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:9px;
  padding:12px 26px;font-size:16px;font-weight:600;cursor:pointer;text-decoration:none;margin-top:14px}
.btn-primary:hover{background:#245fe0}
.btn-secondary{background:transparent;color:#fff;border:1px solid #5e789c;border-radius:9px;padding:12px 22px;font-size:15px;cursor:pointer}
.outro-actions{display:flex;gap:12px;justify-content:center;align-items:center;margin-top:16px}
.spinner{width:38px;height:38px;border:4px solid rgba(255,255,255,.25);border-top-color:#fff;border-radius:50%;margin:0 auto 14px;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---- Floating controls (overlay on stage) ---- */
.controls{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);
  display:flex;align-items:center;gap:14px;z-index:40;
  background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border:1px solid #d7dde6;border-radius:30px;padding:8px 14px;box-shadow:0 8px 24px rgba(12,25,45,.22);
  width:min(680px,86vw)}
.ctl{width:36px;height:36px;border-radius:50%;border:1px solid #c7cfda;background:#fff;color:var(--navy);
  font-size:17px;cursor:pointer;flex:none}
.ctl:disabled{opacity:.4;cursor:default}
.progress{flex:1;height:6px;background:#cdd5e0;border-radius:3px;overflow:hidden}
#progressFill{height:100%;width:0;background:var(--accent);transition:width .3s ease}
.step-label{flex:none;min-width:150px;max-width:230px;text-align:right;font-size:13px;color:var(--navy);font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---- Chapter menu ---- */
.chapters{position:absolute;left:50%;bottom:74px;transform:translateX(-50%);z-index:45;
  width:min(420px,88vw);max-height:52vh;overflow:auto;background:#fff;border:1px solid #d7dde6;
  border-radius:14px;box-shadow:0 16px 40px rgba(12,25,45,.28);padding:8px}
.chapters.hidden{display:none}
.chapters-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;
  color:#7c8aa0;padding:8px 10px 6px}
.chapters-list{list-style:none;margin:0;padding:0}
.chapters-list li{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:8px;
  cursor:pointer;font-size:14px;color:var(--ink)}
.chapters-list li:hover{background:#eef3fb}
.chapters-list li.active{background:#e6efff;color:var(--accent);font-weight:600}
.ch-n{flex:none;width:22px;height:22px;border-radius:50%;background:#eef1f6;color:#5b6b7f;
  font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center}
.chapters-list li.active .ch-n{background:var(--accent);color:#fff}

/* a subtle hint that the page is scrollable/interactive */
.scroll-hint{position:absolute;right:18px;bottom:74px;z-index:40;background:rgba(15,34,56,.82);color:#dce8fb;
  font-size:12px;padding:6px 11px;border-radius:14px;pointer-events:none;opacity:0;transition:opacity .4s}
.scroll-hint.show{opacity:1}