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

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #f3f4f6;
  display: flex;
  justify-content: center;
  padding: 40px;
  margin: 0;
  min-height: 100vh;
  align-items: center;
}

.custom-video-player {
  position: relative;
  width: 100%;
  max-width: 800px;
  border-radius: 16px;
  overflow: hidden;
  background: #000000;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

#main-video {
  width: 100%;
  display: block;
}

.player-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  opacity: 0;
  transition: opacity 0.3s;
}

.custom-video-player:hover .player-controls {
  opacity: 1;
}

#play-pause-btn {
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: color 0.2s;
}

#play-pause-btn:hover {
  color: #3b82f6;
}

.timeline-container {
  flex-grow: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
  position: relative;
  cursor: pointer;
}

.timeline-progress {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  background: #3b82f6;
  border-radius: 3px;
  width: 0%;
  pointer-events: none;
}

.chapter-marker {
  position: absolute;
  top: -3px;
  width: 4px;
  height: 12px;
  background: #ffffff;
  border-radius: 2px;
  transition: transform 0.2s;
}

.chapter-marker:hover {
  transform: scale(1.5);
}

.chapter-marker:hover::after {
  content: attr(title);
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%) scale(0.66);
  background: #111827;
  color: #ffffff;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  white-space: nowrap;
}

.time-display {
  color: #ffffff;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

const video = document.getElementById("main-video");
const playBtn = document.getElementById("play-pause-btn");
const timeline = document.getElementById("timeline");
const progress = document.getElementById("progress");
const timeDisplay = document.getElementById("time-display");

playBtn.addEventListener("click", () => {
  if (video.paused) {
    video.play();
    playBtn.innerHTML = `<svg viewBox="0 0 24 24" width="24" height="24" fill="currentColor"><rect x="6" y="4" width="4" height="16"></rect><rect x="14" y="4" width="4" height="16"></rect></svg>`;
  } else {
    video.pause();
    playBtn.innerHTML = `<svg viewBox="0 0 24 24" width="24" height="24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"></polygon></svg>`;
  }
});

video.addEventListener("timeupdate", () => {
  const pct = (video.currentTime / video.duration) * 100;
  progress.style.width = pct + "%";
  
  const mins = Math.floor(video.currentTime / 60);
  const secs = Math.floor(video.currentTime % 60).toString().padStart(2, "0");
  timeDisplay.textContent = mins + ":" + secs;
});

timeline.addEventListener("click", (e) => {
  const rect = timeline.getBoundingClientRect();
  const clickPos = (e.clientX - rect.left) / rect.width;
  video.currentTime = clickPos * video.duration;
});