/*
 * Command Trainer - Stylesheet
 *
 * @copyright 2025 Kikkun
 * @license   All Rights Reserved
 *
 * このCSSファイルの無断での複製、改変、再配布を禁じます。
 */

:root {
  --color-bg: #f8f9fa;
  --color-terminal-bg: #ffffff;
  --color-text: #212529;
  --color-dimmed-text: #6c757d;
  --color-border: #dee2e6;
  --color-card-bg: #ffffff;
  --color-header-bg: #ffffff;
  --color-input-bg: #ffffff;
  --color-green-accent: #198754;
  --color-red-accent: #dc3545;
  --color-yellow-accent: #ffc107;
  --color-blue-accent: #0d6efd;
  --color-input-text: #212529;
  --color-hint-text: #664d03;
  --color-problem-num-text: #0a58ca;
  --color-link-text: #0a58ca;
  --dot-red: #dc3545;
  --dot-yellow: #ffc107;
  --dot-green: #198754;
  --color-terminal-header-bg: #f1f3f5;
  --color-terminal-border: var(--color-border);
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --border-radius-sm: 6px;
  --border-radius-md: 8px;
  --border-radius-lg: 10px;
  --border-radius-full: 999px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 20px;
}

body.dark-theme {
  --color-bg: #0e0f12;
  --color-card-bg: #12141a;
  --color-border: #2a2f37;
  --color-header-bg: #12141a;
  --color-button-bg: #111827;
  --color-terminal-bg: #000000;
  --color-input-bg: #000000;
  --color-text: #e8e8e8;
  --color-dimmed-text: #9aa0a6;
  --color-button-border-hover: #334155;
  --color-green-accent: #00d27a;
  --color-red-accent: #ff4d4f;
  --color-yellow-accent: #facc15;
  --color-blue-accent: #60a5fa;
  --color-input-text: #ffffff;
  --color-hint-text: var(--color-yellow-accent);
  --color-problem-num-text: var(--color-blue-accent);
  --color-link-text: var(--color-blue-accent);
  --dot-red: #ff5f56;
  --dot-yellow: #ffbd2e;
  --dot-green: #27c93f;
  --color-terminal-header-bg: #2C2C2E;
  --color-terminal-border: #000000;
}

body.ubuntu-theme {
  --color-bg: #2c001e;
  --color-terminal-bg: #300a24;
  --color-text: #eeeeec;
  --color-dimmed-text: #aaa;
  --color-border: #000000;
  --color-card-bg: #1a0b16;
  --color-header-bg: #1a0b16;
  --color-input-bg: #300a24;
  --color-red-accent: #cc0000;
  --color-yellow-accent: #c4a000;
  --color-blue-accent: #3465a4;
  --color-input-text: #ffffff;
  --color-terminal-header-bg: #1a0b16;
  --color-terminal-border: #000000;
}

body.powershell-theme {
  --color-bg: #000c1b;
  --color-terminal-bg: #012456;
  --color-text: #cccccc;
  --color-dimmed-text: #999999;
  --color-border: #2a4e8a;
  --color-card-bg: #011c40;
  --color-header-bg: #000000;
  --color-input-bg: #012456;
  --color-green-accent: #16c60c;
  --color-red-accent: #c50f1f;
  --color-yellow-accent: #f9f1a5;
  --color-blue-accent: #3b78ff;
  --color-input-text: #f9f1a5;
  --color-terminal-header-bg: #000000;
  --color-terminal-border: #000000;
}

body.sepia-theme {
  --color-bg: #fbf1c7;
  --color-terminal-bg: #f2e5bc;
  --color-text: #3c3836;
  --color-dimmed-text: #7c6f64;
  --color-border: #d5c4a1;
  --color-card-bg: #f9f5d7;
  --color-header-bg: #f9f5d7;
  --color-input-bg: #f2e5bc;
  --color-green-accent: #98971a;
  --color-red-accent: #cc241d;
  --color-yellow-accent: #d79921;
  --color-blue-accent: #458588;
  --color-input-text: #3c3836;
  --color-hint-text: #8f7700;
  --color-problem-num-text: var(--color-blue-accent);
  --color-link-text: var(--color-blue-accent);
  --dot-red: #fb4934;
  --dot-yellow: #fabd2f;
  --dot-green: #b8bb26;
  --color-terminal-header-bg: #ebdbb2;
  --color-terminal-border: #d5c4a1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font: var(--font-size-base) / 1.6 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.page-header {
  padding: var(--spacing-lg) max(var(--spacing-lg), calc((100% - 1280px) / 2 + var(--spacing-lg)));
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header-bg);
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
body.dark-theme .page-header,
body.ubuntu-theme .page-header,
body.powershell-theme .page-header,
body.sepia-theme .page-header {
  box-shadow: none;
}

.page-header__left-items {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.page-header__title {
  margin: 0;
  font-size: var(--font-size-md);
  letter-spacing: 0.2px;
  flex-shrink: 0;
}

.page-header__right-items {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-left: auto;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.main-content {
  display: grid;
  grid-template-columns: 280px 4px 1fr;
}

.main-column {
  margin-left: var(--spacing-lg);
}

.main-column__grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: var(--spacing-lg);
}

@media (max-width: 900px) {
  .main-column__grid {
    grid-template-columns: 1fr;
  }
}

.page-footer {
  text-align: center;
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  color: var(--color-dimmed-text);
  font-size: var(--font-size-sm);
}

.page-footer p {
  margin: 0;
}

.sidebar.card {
  height: calc(100vh - 100px);
  max-height: 980px;
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
}

.sidebar .card__body {
  overflow-y: auto;
}

.resizer {
  cursor: col-resize;
  background: transparent;
  position: relative;
}

.resizer::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 60px;
  background: var(--color-border);
  border-radius: 5px;
  transform: translate(-50%, -50%);
  transition: background-color 0.2s ease-in-out;
}

.resizer:hover::after {
  background: var(--color-blue-accent);
}

body.is-resizing {
  user-select: none;
  cursor: col-resize;
}

.command-group {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
}
.command-group:last-child {
  border-bottom: none;
}

.command-title {
  font-weight: bold;
  cursor: pointer;
  padding: var(--spacing-sm) 14px;
  position: relative;
  user-select: none;
  display: flex;
  align-items: center;
  border-radius: 4px;
  margin: 0 4px;
  transition: background-color 0.2s ease-in-out;
}

.command-group.is-active .command-title {
  background-color: var(--color-button-bg);
}
body.dark-theme .command-group.is-active .command-title {
  background-color: #111827;
}

.command-title:hover {
  background-color: var(--color-button-border-hover);
}
body.dark-theme .command-title:hover {
  background-color: #334155;
}

.command-title::after {
  content: '▼';
  position: absolute;
  right: 14px;
  font-size: 10px;
  transition: transform 0.2s ease-in-out;
}

.command-group.is-closed .command-title::after {
  transform: rotate(-90deg);
}

.problem-checklist {
  list-style: none;
  padding-left: 20px;
  margin: var(--spacing-sm) 0 0;
  max-height: 2000px;
  overflow: hidden;
  transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out;
  opacity: 1;
}

.command-group.is-closed .problem-checklist {
  max-height: 0;
  opacity: 0;
}

.problem-checklist li {
  margin-bottom: var(--spacing-md);
}

.problem-checklist label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-dimmed-text);
  cursor: pointer;
}

.problem-checklist label:hover {
  color: var(--color-text);
}

.problem-checklist label.is-bookmarked::before {
  content: '★';
  color: var(--color-yellow-accent);
  font-size: 12px;
  line-height: 1;
  margin-left: -4px;
}

.problem-checklist input[type="checkbox"] {
  cursor: pointer;
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
body.dark-theme .card,
body.ubuntu-theme .card,
body.powershell-theme .card,
body.sepia-theme .card {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card__title {
  margin: 0;
  padding: var(--spacing-md) 14px;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-base);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.card__title-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.bookmark-filter-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: normal;
  font-size: var(--font-size-sm);
  color: var(--color-dimmed-text);
  cursor: pointer;
  user-select: none;
  padding: 4px 8px;
  border-radius: var(--border-radius-sm);
  transition: background-color 0.2s;
}
.bookmark-filter-label:hover {
  background-color: rgba(108, 117, 125, 0.1);
}
body.dark-theme .bookmark-filter-label:hover {
  background-color: rgba(154, 160, 166, 0.1);
}
.bookmark-filter-label input[type="checkbox"] {
  cursor: pointer;
}


.bookmark-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: normal;
  font-size: var(--font-size-sm);
  color: var(--color-dimmed-text);
  cursor: pointer;
  user-select: none;
}

.bookmark-label:hover {
  color: var(--color-text);
}

.card__body {
  padding: var(--spacing-md) 14px;
  color: var(--color-dimmed-text);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  overflow-y: auto;
}

.problem-card {
  display: flex;
  flex-direction: column;
  height: 480px;
}

.problem-text {
  flex-grow: 1;
  margin-bottom: var(--spacing-md);
  min-height: 80px;
  color: var(--color-text);
}

.problem-text b {
  color: var(--color-link-text);
}

.solution-display {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  color: var(--color-text);
  white-space: pre-wrap;
}

.terminal {
  background: var(--color-terminal-bg);
  border: 1px solid var(--color-terminal-border);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.07);
  display: flex;
  flex-direction: column;
  height: 480px;
  resize: vertical;
  overflow: auto;
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-terminal-border);
  background: var(--color-terminal-header-bg);
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
  flex-shrink: 0;
}

.terminal__dot {
  width: var(--spacing-md);
  height: var(--spacing-md);
  border-radius: 50%;
}

.terminal__dot--red { background: var(--dot-red); }
.terminal__dot--yellow { background: var(--dot-yellow); }
.terminal__dot--green { background: var(--dot-green); }

.terminal__app-name {
  color: var(--color-dimmed-text);
  margin-left: var(--spacing-sm);
}

.terminal__screen {
  padding: var(--spacing-md);
  flex-grow: 1;
  overflow-y: auto;
  white-space: pre-wrap;
  background: var(--color-input-bg);
}

.terminal__prompt-line {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  padding-bottom: 2px;
}

.terminal__prompt {
  color: var(--color-green-accent);
  font-weight: bold;
  white-space: nowrap;
}

.terminal__input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-input-text);
  font: inherit;
}

.executed-command {
  color: var(--color-text);
}

.button-group {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
}

.page-header .button-group {
  margin-top: 0;
}

.button,
.theme-select,
.lang-select {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 6px 10px;
  font: inherit;
  cursor: pointer;
  transition: border-color 0.2s ease-in-out, background-color 0.2s ease-in-out;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  border-radius: var(--border-radius-sm);
}

.button:hover,
.theme-select:hover,
.lang-select:hover {
  background-color: #f8f9fa;
  border-color: #adb5bd;
}

.button.is-active {
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}
.button--primary {
  background-color: var(--color-blue-accent);
  border-color: var(--color-blue-accent);
  color: #fff;
}
.button--primary:hover {
  background-color: var(--color-blue-accent);
  filter: brightness(95%);
  border-color: var(--color-blue-accent);
  color: #fff;
}
.button--danger {
  color: var(--color-red-accent);
  border-color: var(--color-red-accent);
}
.button--danger:hover {
  color: #fff;
  background-color: var(--color-red-accent);
  border-color: var(--color-red-accent);
}

.button--icon {
  width: 34px;
  padding: 6px;
  font-weight: bold;
  border-radius: 50%;
  line-height: 1.2;
}
.button--icon svg {
  width: 100%;
  height: 100%;
}

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.theme-select,
.lang-select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url('data:image/svg+xml;utf8,<svg fill="%23212529" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 16px;
  padding-right: 30px;
}

.theme-select option,
.lang-select option {
  background: var(--color-card-bg);
  color: var(--color-text);
}

body.dark-theme .button,
body.dark-theme .theme-select,
body.dark-theme .lang-select {
  background-color: var(--color-button-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

body.dark-theme .button:hover,
body.dark-theme .theme-select:hover,
body.dark-theme .lang-select:hover {
  border-color: var(--color-button-border-hover);
}

body.dark-theme .button.is-active {
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 8px rgba(96, 165, 250, 0.5);
}
body.dark-theme .button--danger {
  border-color: var(--color-red-accent);
  color: var(--color-red-accent);
}
body.dark-theme .button--danger:hover {
  background-color: rgba(255, 77, 79, 0.1);
  border-color: var(--color-red-accent);
  color: var(--color-red-accent);
}
body.dark-theme .button--primary:hover {
  filter: brightness(95%);
}

body.dark-theme .theme-select,
body.dark-theme .lang-select,
body.ubuntu-theme .theme-select,
body.ubuntu-theme .lang-select,
body.powershell-theme .theme-select,
body.powershell-theme .lang-select {
  background-image: url('data:image/svg+xml;utf8,<svg fill="%23e8e8e8" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
}

body.sepia-theme .theme-select,
body.sepia-theme .lang-select {
  background-image: url('data:image/svg+xml;utf8,<svg fill="%233c3836" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
}

body.dark-theme .theme-select option,
body.dark-theme .lang-select option {
  background-color: var(--color-button-bg);
  color: var(--color-text);
}

.text--success { color: var(--color-green-accent); }
.text--error { color: var(--color-red-accent); }
.text--hint { color: var(--color-hint-text); }
.text--explanation { color: var(--color-text); }
.text--muted { color: var(--color-dimmed-text); }
.text--problem-num { color: var(--color-problem-num-text); font-weight: bold; }

body.dark-theme .text--explanation { color: #ffffff; }

.kbd {
  display: inline-block;
  border-bottom-width: 2px;
  border-radius: var(--border-radius-sm);
  padding: 0 6px;
  margin: 0 2px;
  background-color: #e9ecef;
  color: #495057;
  border: 1px solid #ced4da;
}
body.dark-theme .kbd {
  border: 1px solid #374151;
  color: #e5e7eb;
  background-color: initial;
}

body.ubuntu-theme .page-header {
  border-bottom-color: #333;
}

body.ubuntu-theme .kbd {
  background-color: initial;
  border-color: #374151;
  color: #e5e7eb;
}

body.ubuntu-theme .button,
body.ubuntu-theme .theme-select,
body.ubuntu-theme .lang-select {
  background-color: #2c001e;
  border-color: #42002d;
  color: var(--color-text);
}
body.ubuntu-theme .button:hover,
body.ubuntu-theme .theme-select:hover,
body.ubuntu-theme .lang-select:hover {
  background-color: #5b294a;
  border-color: #7d3f69;
}
body.ubuntu-theme .button.is-active {
  border-color: var(--color-blue-accent);
}
body.ubuntu-theme .theme-select option,
body.ubuntu-theme .lang-select option {
  background-color: #2c001e;
  color: var(--color-text);
}

body.powershell-theme .terminal__prompt {
  color: var(--color-text);
}

body.powershell-theme .text--explanation {
  color: var(--color-text);
}

body.powershell-theme .kbd {
  background-color: initial;
  border-color: #374151;
  color: #e5e7eb;
}

body.powershell-theme .button,
body.powershell-theme .theme-select,
body.powershell-theme .lang-select {
  background-color: var(--color-card-bg);
  border-color: var(--color-border);
  color: var(--color-text);
}
body.powershell-theme .button:hover,
body.powershell-theme .theme-select:hover,
body.powershell-theme .lang-select:hover {
  background-color: #0c3263;
  border-color: var(--color-blue-accent);
}
body.powershell-theme .button.is-active {
  border-color: var(--color-blue-accent);
}
body.powershell-theme .theme-select option,
body.powershell-theme .lang-select option {
  background-color: var(--color-card-bg);
  color: var(--color-text);
}

body.sepia-theme .kbd {
  background-color: #ebdbb2;
  border-color: #d5c4a1;
  color: var(--color-text);
}

body.sepia-theme .button,
body.sepia-theme .theme-select,
body.sepia-theme .lang-select {
  background-color: var(--color-card-bg);
  border-color: var(--color-border);
  color: var(--color-text);
}
body.sepia-theme .button:hover,
body.sepia-theme .theme-select:hover,
body.sepia-theme .lang-select:hover {
  background-color: #ebdbb2;
  border-color: #bdae93;
}
body.sepia-theme .button.is-active {
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 0 0.25rem rgba(69, 133, 136, 0.25);
}
body.sepia-theme .theme-select option,
body.sepia-theme .lang-select option {
  background-color: var(--color-card-bg);
  color: var(--color-text);
}
body.sepia-theme .problem-nav-btn.is-completed {
  background-color: #d4e09b;
  border-color: #b8bb26;
  color: #504945;
}
body.sepia-theme .problem-nav-btn.is-current {
  background-color: #c1d4d5;
  color: #282828;
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 0 0.25rem rgba(69, 133, 136, 0.25);
}
body.sepia-theme .progress-bar-container {
  background-color: #ebdbb2;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background-color: #ced4da;
  border-radius: 5px;
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background-color: #adb5bd;
}

body.dark-theme ::-webkit-scrollbar-track,
body.ubuntu-theme ::-webkit-scrollbar-track,
body.powershell-theme ::-webkit-scrollbar-track {
  background: var(--color-terminal-bg);
}

body.sepia-theme ::-webkit-scrollbar-thumb {
  background-color: #bdae93;
  border-color: var(--color-bg);
}
body.sepia-theme ::-webkit-scrollbar-thumb:hover {
  background-color: #a89984;
}

body.dark-theme ::-webkit-scrollbar-thumb,
body.ubuntu-theme ::-webkit-scrollbar-thumb,
body.powershell-theme ::-webkit-scrollbar-thumb {
  background-color: #4a4a4a;
  border-color: var(--color-terminal-bg);
}

body.dark-theme ::-webkit-scrollbar-thumb:hover,
body.ubuntu-theme ::-webkit-scrollbar-thumb:hover,
body.powershell-theme ::-webkit-scrollbar-thumb:hover {
  background-color: #6a6a6a;
}

.problem-navigation-card {
  margin-top: var(--spacing-lg);
  height: 300px;
  display: flex;
  flex-direction: column;
  resize: vertical;
  overflow: auto;
  min-height: 150px;
}

.problem-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-content: flex-start;
}

.problem-nav-btn {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 6px;
  font: inherit;
  cursor: pointer;
  border-radius: var(--border-radius-sm);
  min-width: 40px;
  text-align: center;
  transition: all 0.2s ease-in-out;
  position: relative;
}
.problem-nav-btn:hover {
  background-color: #e9ecef;
  border-color: #adb5bd;
}
.problem-nav-btn.is-completed {
  background-color: #d1e7dd;
  border-color: #a3cfbb;
  color: #0a3622;
}
.problem-nav-btn.is-current {
  background-color: #cfe2ff;
  color: #052c65;
  font-weight: bold;
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
  position: relative;
  z-index: 2;
}
.problem-nav-btn.is-bookmarked::after {
  content: '★';
  color: #f59f00;
  font-size: 14px;
  position: absolute;
  top: -6px;
  right: -4px;
}

body.dark-theme .problem-nav-btn {
  background: var(--color-button-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
body.dark-theme .problem-nav-btn:hover {
  border-color: var(--color-button-border-hover);
  background-color: #1f2937;
}
body.ubuntu-theme .problem-nav-btn:hover {
  background-color: #5b294a;
  border-color: #7d3f69;
}
body.powershell-theme .problem-nav-btn:hover {
  background-color: #0c3263;
  border-color: var(--color-blue-accent);
}
body.dark-theme .problem-nav-btn.is-completed,
body.ubuntu-theme .problem-nav-btn.is-completed,
body.powershell-theme .problem-nav-btn.is-completed {
  background-color: #16342b;
  border-color: var(--color-green-accent);
  color: var(--color-green-accent);
}
body.dark-theme .problem-nav-btn.is-current,
body.ubuntu-theme .problem-nav-btn.is-current,
body.powershell-theme .problem-nav-btn.is-current {
  background-color: #1e3a8a;
  color: #eff6ff;
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 8px rgba(96, 165, 250, 0.5);
  font-weight: bold;
}
body.dark-theme .problem-nav-btn.is-bookmarked::after {
  color: var(--color-yellow-accent);
}

.problem-nav-group {
  width: 100%;
  margin-bottom: var(--spacing-md);
}

.problem-nav-group__title {
  font-size: var(--font-size-sm);
  color: var(--color-dimmed-text);
  margin: 0 0 var(--spacing-sm) 0;
  font-weight: normal;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 4px;
}

.progress-indicator {
  font-size: var(--font-size-sm);
  color: var(--color-dimmed-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-weight: normal;
}
.progress-bar-container {
  width: 100px;
  height: 8px;
  background-color: #e9ecef;
  border-radius: var(--border-radius-full);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.progress-bar {
  width: 0%;
  height: 100%;
  background-color: var(--color-green-accent);
  transition: width 0.3s ease-in-out;
}
body.dark-theme .progress-bar-container {
  background-color: var(--color-button-bg);
}

.tooltip-container {
  position: relative;
  display: inline-block;
}

.tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-lg);
  width: 450px;
  max-width: 90vw;
  z-index: 10;
  visibility: hidden;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out, visibility 0.2s;
  color: var(--color-text);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
body.dark-theme .tooltip {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tooltip.is-visible {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.tooltip::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 12px;
  border-width: 8px;
  border-style: solid;
  border-color: transparent transparent var(--color-border) transparent;
}

.tooltip::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 12px;
  margin-bottom: -1px;
  border-width: 8px;
  border-style: solid;
  border-color: transparent transparent var(--color-card-bg) transparent;
  z-index: 1;
}

.tooltip__content pre {
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  white-space: pre-wrap;
  font-size: var(--font-size-sm);
  overflow-x: auto;
  background-color: #f1f3f5;
  color: var(--color-text);
}

body.dark-theme .tooltip__content pre,
body.ubuntu-theme .tooltip__content pre,
body.powershell-theme .tooltip__content pre {
  background-color: var(--color-terminal-bg);
}
body.sepia-theme .tooltip__content pre {
  background-color: var(--color-terminal-bg);
}

.tooltip__content code {
  font-family: inherit;
}

/* === Syntax Highlighting for JSON Tooltip START === */
/* Default Light Theme */
.json-key { color: #9B239B; }
.json-string { color: #198754; }
.json-number { color: #0d6efd; }
.json-punctuation { color: #212529; }

/* Dark Theme */
body.dark-theme .json-key { color: #60a5fa; }
body.dark-theme .json-string { color: #00d27a; }
body.dark-theme .json-number { color: #facc15; }
body.dark-theme .json-punctuation { color: #e8e8e8; }

/* Ubuntu Theme - 落ち着いた色合いに調整 */
body.ubuntu-theme .json-key { color: #729fcf; } /* 少し明るさを抑えた青 */
body.ubuntu-theme .json-string { color: #8ae234; } /* 視認性の良い緑 */
body.ubuntu-theme .json-number { color: #fce94f; } /* Ubuntuらしい黄色 */
body.ubuntu-theme .json-punctuation { color: var(--color-text); }

/* PowerShell Theme - 鮮やかさを抑え、目に優しく調整 */
body.powershell-theme .json-key { color: #569cd6; } /* 落ち着いた青 */
body.powershell-theme .json-string { color: #ce9178; } /* 伝統的な文字列の色（オレンジ系） */
body.powershell-theme .json-number { color: #b5cea8; } /* 柔らかい緑 */
body.powershell-theme .json-punctuation { color: var(--color-text); }

/* Sepia Theme */
body.sepia-theme .json-key { color: #b16286; }
body.sepia-theme .json-string { color: #98971a; }
body.sepia-theme .json-number { color: #d65d0e; }
body.sepia-theme .json-punctuation { color: var(--color-text); }
/* === Syntax Highlighting for JSON Tooltip END === */

.tooltip__note {
  font-size: var(--font-size-sm);
  color: var(--color-dimmed-text);
  margin-top: var(--spacing-md);
  margin-bottom: 0;
  line-height: 1.5;
}

.wizard-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s;
}

.wizard-modal.is-visible {
  opacity: 1;
  visibility: visible;
}

.wizard-content {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  width: 90vw;
  max-width: 800px;
  height: 85vh;
  max-height: 700px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transform: scale(0.95);
  transition: transform 0.2s ease;
}
.wizard-modal.is-visible .wizard-content {
  transform: scale(1);
}

.wizard-header {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-md);
  font-weight: bold;
  flex-shrink: 0;
}

.wizard-container {
  display: flex;
  flex-grow: 1;
  overflow: hidden;
}

.wizard-sidebar {
  width: 200px;
  padding: var(--spacing-lg);
  border-right: 1px solid var(--color-border);
  flex-shrink: 0;
}

.wizard-progress-list {
  list-style: none;
  padding: 0;
  margin: 0;
  position: sticky;
  top: 20px;
}

.wizard-progress-step {
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-sm);
  opacity: 0.5;
  position: relative;
  padding-left: 28px;
  border: 1px solid transparent;
  transition: all 0.2s ease-in-out;
}

.wizard-progress-step::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-dimmed-text);
  border: 2px solid var(--color-card-bg);
}

.wizard-progress-step.is-completed {
  opacity: 1;
}
.wizard-progress-step.is-completed::before {
  background-color: var(--color-green-accent);
}

.wizard-progress-step.is-active {
  opacity: 1;
  font-weight: bold;
  background-color: rgba(13, 110, 253, 0.1);
  border-color: var(--color-blue-accent);
}
body.sepia-theme .wizard-progress-step.is-active {
  background-color: rgba(69, 133, 136, 0.1);
}
.wizard-progress-step.is-active::before {
  background-color: var(--color-blue-accent);
}

.wizard-main {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.wizard-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex-grow: 1;
}

.wizard-step {
  display: none;
}
.wizard-step.is-active {
  display: block;
}

.wizard-section {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg);
}

.wizard-section__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}
.wizard-section__header .wizard-section__title {
  margin: 0;
}

.wizard-section__title {
  font-weight: bold;
  margin: 0 0 var(--spacing-md) 0;
}

.wizard-upload-area .button {
  width: 100%;
  max-width: 250px;
}
#wizard-upload-feedback,
#settings-restore-feedback {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
}

.wizard-problem-set {
  background: #f8f9fa;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--color-border);
}
body.dark-theme .wizard-problem-set,
body.ubuntu-theme .wizard-problem-set,
body.powershell-theme .wizard-problem-set,
body.sepia-theme .wizard-problem-set {
  background: var(--color-bg);
}

.wizard-problem-set__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  user-select: none;
}
.wizard-problem-set__header:hover {
  background-color: var(--color-button-border-hover);
}
body.sepia-theme .wizard-problem-set__header:hover {
  background-color: #ebdbb2;
}

.wizard-problem-set__list {
  list-style: none;
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  margin: 0;
  border-top: 1px solid var(--color-border);
}

.wizard-problem-set.is-closed .wizard-problem-set__list {
  display: none;
}

.wizard-problem-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}
.wizard-problem-item:last-child {
  border-bottom: none;
}
.wizard-problem-item__text {
  color: var(--color-dimmed-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: var(--spacing-md);
}

.wizard-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.wizard-footer .button-group {
  margin-left: auto;
}

/* === Memo styles START === */
.memo-container {
  margin-bottom: var(--spacing-md);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, opacity 0.3s ease-out, margin-top 0.3s ease-out;
}
.memo-container.is-visible {
  max-height: 300px;
  opacity: 1;
  margin-top: var(--spacing-md);
}
.memo-title {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-sm);
  font-weight: bold;
  color: var(--color-dimmed-text);
}
.memo-textarea {
  width: 100%;
  min-height: 80px;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background-color: var(--color-input-bg);
  color: var(--color-input-text);
  font: inherit;
  resize: vertical;
}
.memo-textarea:focus {
  outline: none;
  border-color: var(--color-blue-accent);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}
body.dark-theme .memo-textarea:focus {
  box-shadow: 0 0 8px rgba(96, 165, 250, 0.5);
}
body.sepia-theme .memo-textarea:focus {
  box-shadow: 0 0 0 0.25rem rgba(69, 133, 136, 0.25);
}
.button#memoBtn.has-content {
  color: var(--color-blue-accent);
  border-color: var(--color-blue-accent);
}
.button#memoBtn.has-content:hover {
  background-color: rgba(13, 110, 253, 0.1);
}
body.dark-theme .button#memoBtn.has-content {
  color: var(--color-blue-accent);
  border-color: var(--color-blue-accent);
}
body.dark-theme .button#memoBtn.has-content:hover {
  background-color: rgba(96, 165, 250, 0.15);
}
/* === Memo styles END === */

/* === UI/UX Improvements === */

/* === Layout & Spacing Improvements START === */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.terminal, .terminal__input, .tooltip__content pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
.main-content {
  grid-template-columns: 270px 4px 1fr;
  gap: var(--spacing-sm);
}
.main-column {
  margin-left: 0;
}
.card {
  border: none;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.07);
  transition: box-shadow 0.2s ease-in-out;
}
.card:hover {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.08);
}
body.dark-theme .card {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}
body.dark-theme .card:hover {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
}
.card__title {
  padding: var(--spacing-lg) var(--spacing-xl);
}
.card__body {
  padding: var(--spacing-xl);
}
.terminal {
  border-radius: var(--border-radius-md);
}
.terminal__header {
  padding: var(--spacing-md);
}
/* === Layout & Spacing Improvements END === */

/* === Color & Theme Refinements START === */
:root {
  --color-bg: #f7f8fc;
  --color-card-bg: #ffffff;
  --color-border: #e2e8f0;
  --color-blue-accent: #4f46e5;
}
body.dark-theme {
  --color-bg: #111827;
  --color-card-bg: #1f2937;
  --color-border: #374151;
  --color-text: #d1d5db;
  --color-dimmed-text: #9ca3af;
  --color-blue-accent: #818cf8;
  --color-terminal-bg: #000000;
  --color-input-bg: #000000;
}
/* === Color & Theme Refinements END === */

/* === Component Design Improvements START === */
.button, .theme-select, .lang-select {
  border-radius: var(--border-radius-md);
  font-weight: 500;
  transition: all 0.2s ease-in-out;
}
.button:hover, .theme-select:hover, .lang-select:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.button--primary {
  font-weight: bold;
}
.problem-nav-btn {
  border-radius: var(--border-radius-md);
  font-weight: 500;
}
.problem-nav-btn.is-current {
  transform: scale(1.1);
  font-weight: bold;
}
.problem-nav-btn.is-completed::before {
  content: '✔';
  margin-right: 4px;
  color: var(--color-green-accent);
}
.page-header {
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  border-bottom: none;
}
body.dark-theme .page-header {
  box-shadow: 0 1px 3px rgba(0,0,0,0.5);
}
/* === Component Design Improvements END === */

/* === Sidebar Visibility Improvements START === */
#problem-selector-list > .command-group > .command-title {
  font-size: 1.1em;
  font-weight: bold;
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  color: var(--color-text);
}
#problem-selector-list > .command-group > .problem-checklist > .command-group > .command-title {
  font-weight: 500;
}
.problem-checklist {
  padding-left: 24px;
}
.command-group.is-active > .command-title {
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--color-blue-accent);
}
body.dark-theme .command-group.is-active > .command-title {
  background-color: rgba(129, 140, 248, 0.1);
  color: var(--color-blue-accent);
}
/* === Sidebar Visibility Improvements END === */

/* === Dashboard Tabs START === */
.dashboard-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}
.dashboard-tab-btn {
  padding: 8px 16px;
  cursor: pointer;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--color-dimmed-text);
  font: inherit;
  font-size: var(--font-size-sm);
  transition: all 0.2s ease-in-out;
}
.dashboard-tab-btn:hover {
  background-color: rgba(108, 117, 125, 0.1);
  color: var(--color-text);
}
.dashboard-tab-btn.is-active {
  color: var(--color-blue-accent);
  border-bottom-color: var(--color-blue-accent);
  font-weight: bold;
}
/* === Dashboard Tabs END === */

/* === Dashboard Theming START === */
body.dark-theme #dashboardModal .dashboard-tab-btn:hover,
body.ubuntu-theme #dashboardModal .dashboard-tab-btn:hover,
body.powershell-theme #dashboardModal .dashboard-tab-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
}
body.sepia-theme #dashboardModal .dashboard-tab-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

body.dark-theme #dashboardModal .dashboard-tab-btn.is-active,
body.ubuntu-theme #dashboardModal .dashboard-tab-btn.is-active,
body.powershell-theme #dashboardModal .dashboard-tab-btn.is-active,
body.sepia-theme #dashboardModal .dashboard-tab-btn.is-active {
  color: var(--color-blue-accent);
  border-bottom-color: var(--color-blue-accent);
}

#dashboardModal #difficult-problems-list {
  color: var(--color-dimmed-text);
}
/* === Dashboard Theming END === */

/* === Settings Modal New Styles START === */
.settings-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.settings-nav-item {
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-sm);
  transition: background-color 0.2s, color 0.2s;
  font-weight: 500;
}
.settings-nav-item:hover {
  background-color: rgba(108, 117, 125, 0.1);
}
.settings-nav-item.is-active {
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--color-blue-accent);
  font-weight: bold;
}
body.dark-theme .settings-nav-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
}
body.dark-theme .settings-nav-item.is-active {
  background-color: rgba(129, 140, 248, 0.15);
  color: var(--color-blue-accent);
}
body.sepia-theme .settings-nav-item.is-active {
  background-color: rgba(69, 133, 136, 0.1);
}
.settings-tab-content {
  display: none;
}
.settings-tab-content.is-active {
  display: block;
}
/* === Settings Modal New Styles END === */