* {
  box-sizing: border-box;
}

:root {
  --bg-color: #f0f2f5;
  --text-color: #0f0f0f;
  --text-sub-color: #606060;
  --card-bg-color: #ffffff;
  --border-color: #e0e0e0;
  --border-color-strong: #ccc;
  --primary-color: #065fd4;
  --primary-bg-color: #e8f0fe;
  --primary-hover-color: #174ea6;
  --primary-hover-bg-color: #d2e3fc;
  --secondary-bg-color: #f2f2f2;
  --secondary-hover-bg-color: #e5e5e5;
  --input-bg-color: #fff;
  --shadow-color: rgba(0,0,0,0.1);
  --placeholder-bg: #f9f9f9;
  --volume-control-bg: #f9f9f9;
  --setting-box-bg: #fdfdfd;
  --toast-bg: #333;
  --toast-text: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f0f0f;
    --text-color: #f1f1f1;
    --text-sub-color: #aaaaaa;
    --card-bg-color: #212121;
    --border-color: #3e3e3e;
    --border-color-strong: #555;
    --primary-color: #3ea6ff;
    --primary-bg-color: #263850;
    --primary-hover-color: #60b6ff;
    --primary-hover-bg-color: #3e5570;
    --secondary-bg-color: #303030;
    --secondary-hover-bg-color: #404040;
    --input-bg-color: #121212;
    --shadow-color: rgba(0,0,0,0.5);
    --placeholder-bg: #181818;
    --volume-control-bg: #303030;
    --setting-box-bg: #2a2a2a;
    --toast-bg: #f1f1f1;
    --toast-text: #0f0f0f;
  }
}

body {
  font-family: "Roboto", "Helvetica", "Arial", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 20px;
}
#time-display {
  font-size: 18px;
  color: var(--text-color);
  margin-top: 10px;
}

#time-input {
  margin-top: 20px;
}

/* 2つの動画を横並びに */
#video-container {
  width: 100%;
  height: fit-content;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 20px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg-color);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px var(--shadow-color);
}

#range-container {
  display: flex;
  justify-content: center;
}

#positon_bar {
  width: 40%
}

#player {
  width: 100%;
  height: auto;
  aspect-ratio: 640 / 390;
}

#player2 {
  width: 100%;
  height: auto;
  aspect-ratio: 640 / 390;
}

#MainArea {
  display: flex;
  width: 50%;
  flex-basis: 50%;
  height: fit-content;
  flex-direction: column;
}

#SubArea {
  display: flex;
  width: 50%;
  flex-basis: 50%;
  height: fit-content;
  flex-direction: column;
}

#CenterLine {
  flex-basis: 16px;
  cursor: col-resize;
  background-color: var(--primary-color);
}

#floating-controls {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 -2px 8px rgba(0,0,0,0.15);
  padding: 10px 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 25px;
  flex-wrap: wrap;
  z-index: 1001;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: transform 0.3s ease-in-out;
}

.floating-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

#floating-controls label {
  font-weight: 500;
  font-size: 0.9em;
  color: #3c4043;
}

#floating-controls input[type="range"] {
  width: 100px;
}

#floating-controls input[type="number"] {
  width: 70px;
  text-align: center;
  height: 36px;
  border-radius: 4px;
  border: 1px solid #ccc;
}

#floating-controls #floating-playback-rate-label {
  font-weight: bold;
  min-width: 40px;
  font-variant-numeric: tabular-nums;
}

@media screen and (max-width: 600px) {
  #video-container {
    width: 100%;
    height: fit-content;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid var(--border-color);
  }

  #MainArea {
    display: flex;
    width: 100% !important;
    flex-basis: auto !important;
    height: fit-content;
    flex-direction: column;
  }

  #SubArea {
    display: flex;
    width: 100% !important;
    flex-basis: auto !important;
    height: fit-content;
    flex-direction: column;
  }

  #positon_bar {
    display: none;
  }

  

  .settings-container {
    flex-direction: column;
  }

  .settings-container > .control-group {
    min-width: 0;
    box-sizing: border-box;
  }

 #floating-controls {
    justify-content: space-around;
    gap: 15px;
    padding: 10px;
  }
  .floating-group {
    gap: 5px;
  }
}

.control-group {
  margin-top: 20px;
  padding: 15px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--card-bg-color);
  box-shadow: 0 2px 4px var(--shadow-color);
}

.video-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 15px;
}

.popout {
  position: fixed !important;
  bottom: 20px;
  z-index: 1000;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  background: #000;
  resize: both;
  overflow: hidden;
}
#MainArea.popout { left: 20px; right: auto; width: 320px; }
#SubArea.popout { right: 20px; left: auto; width: 320px; }

.settings-container {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 20px;
  align-items: flex-start;
}
.settings-container > .control-group {
  flex: 1;
  min-width: 300px;
  margin-top: 0;
}
.settings-container > .control-group.collapsed {
  flex: 0 0 auto;
  min-width: 0;
}
.settings-main-panel {
  flex: 2;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 300px;
}
.settings-main-panel > .control-group {
  margin-top: 0;
  width: 100%;
}

.toggle-header {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 10px 0;
  white-space: nowrap;
}
.control-group.collapsed .group-content {
  display: none;
}
.control-group.collapsed .toggle-header {
  margin-bottom: 0;
}

#memo-view {
  min-height: 100px;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  cursor: text;
  border: 1px solid var(--border-color-strong);
  padding: 5px;
  background: var(--input-bg-color);
  border-radius: 4px;
  color: var(--text-color);
}
#memo-edit {
  width: 100%;
  height: 300px;
  box-sizing: border-box;
  padding: 5px;
  border-radius: 4px;
  border: 1px solid var(--border-color-strong);
  resize: vertical;
  background-color: var(--input-bg-color);
  color: var(--text-color);
}
.timestamp-link {
  color: var(--primary-color);
  text-decoration: none;
  cursor: pointer;
  font-weight: bold;
}
.timestamp-link:hover {
  text-decoration: underline;
}
.video-placeholder {
  width: 100%;
  height: auto;
  aspect-ratio: 640 / 390;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--placeholder-bg);
  border: 1px dashed var(--border-color-strong);
  color: var(--text-sub-color);
  border-radius: 8px;
}
.video-placeholder p { margin: 0 0 15px 0; font-weight: bold; }
.video-placeholder input { 
  padding: 8px; 
  width: 80%; 
  max-width: 300px; 
  margin-bottom: 10px; 
  border: 1px solid var(--border-color-strong); 
  border-radius: 4px; 
  background-color: var(--input-bg-color);
  color: var(--text-color);
}

#toast {
  visibility: hidden;
  min-width: 250px;
  background-color: var(--toast-bg);
  color: var(--toast-text);
  text-align: center;
  border-radius: 4px;
  padding: 10px;
  position: fixed;
  z-index: 1001;
  left: 50%;
  transform: translateX(-50%);
  bottom: 80px;
  font-size: 16px;
  opacity: 0;
  transition: opacity 0.3s;
}
#toast.show {
  visibility: visible;
  opacity: 1;
}

/* Range slider styling */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
}
input[type=range]::-moz-range-track {
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 16px;
  width: 16px;
  border-radius: 50%;
  background: var(--primary-color);
  margin-top: -5px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  transition: transform 0.1s;
}
input[type=range]::-moz-range-thumb {
  height: 16px;
  width: 16px;
  border: none;
  border-radius: 50%;
  background: var(--primary-color);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  transition: transform 0.1s;
}
input[type=range]::-webkit-slider-thumb:hover,
input[type=range]::-moz-range-thumb:hover {
  transform: scale(1.2);
}
input[type=range]:focus {
  outline: none;
}

/* Modern button styling */
button {
  padding: 6px 12px;
  border: 1px solid var(--border-color-strong);
  border-radius: 4px;
  background-color: var(--card-bg-color);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-color);
  transition: background-color 0.2s, box-shadow 0.2s, border-color 0.2s;
  font-family: inherit;
}
button:hover {
  background-color: var(--secondary-hover-bg-color);
  border-color: var(--text-sub-color);
  box-shadow: 0 1px 2px var(--shadow-color);
}
button:active {
  background-color: var(--border-color);
  box-shadow: inset 0 1px 3px var(--shadow-color);
}

/* Modern input fields */
input[type="text"],
input[type="number"] {
  padding: 6px 10px;
  border: 1px solid var(--border-color-strong);
  border-radius: 4px;
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
  box-sizing: border-box;
  background-color: var(--input-bg-color);
  color: var(--text-color);
}
input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
#memo-edit:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(6, 95, 212, 0.2);
  outline: none;
}

/* Modern checkbox */
input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: var(--primary-color);
  vertical-align: text-bottom;
}

.volume-control-container {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border-color);
  padding: 2px 12px;
  border-radius: 20px;
  background-color: var(--volume-control-bg);
  transition: box-shadow 0.2s, border-color 0.2s;
}
.volume-control-container:hover {
  border-color: var(--border-color-strong);
  box-shadow: 0 1px 2px var(--shadow-color);
}
.volume-control-container .volume-slider {
  width: 80px;
  margin: 0;
}
.volume-control-container .volume-label {
  min-width: 30px;
  text-align: right;
  font-size: 0.9em;
  color: var(--text-sub-color);
  font-variant-numeric: tabular-nums;
}
.volume-control-container .mute-btn {
  border: none;
  background: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  color: var(--text-color);
}

/* Time shift buttons */
.time-adjust-btn {
  min-width: 48px;
  height: 36px;
  border-radius: 18px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg-color);
  color: var(--text-color);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s, color 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
}
.time-adjust-btn:hover {
  background-color: var(--secondary-bg-color);
  color: var(--text-color);
  box-shadow: 0 1px 3px var(--shadow-color);
  border-color: var(--border-color-strong);
}
.time-adjust-btn:active {
  background-color: var(--secondary-hover-bg-color);
  box-shadow: none;
}

.action-btn {
  height: 36px;
  padding: 0 16px;
  border-radius: 4px;
  border: none;
  background-color: var(--primary-bg-color);
  color: var(--primary-color);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}
.action-btn:hover {
  background-color: var(--primary-hover-bg-color);
  color: var(--primary-hover-color);
}
.action-btn.secondary {
  background-color: var(--secondary-bg-color);
  color: var(--text-color);
}
.action-btn.secondary:hover {
  background-color: var(--secondary-hover-bg-color);
  color: var(--text-color);
}

.video-setting-panel {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.video-setting-box {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
  background-color: var(--setting-box-bg);
}

.video-setting-box h4 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.1em;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}
.video-setting-box .video-controls { margin-top: 0; }