/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #1c1c20;
  --surface:      #25252a;
  --sidebar-bg:   #16161a;
  --sidebar-hover:#2d2d34;
  --sidebar-active:#0066b4;
  --accent:       #007acc;
  --accent-hover: #0095f0;
  --text-primary: #dcdcdc;
  --text-secondary:#8c8c91;
  --header-bar:   #121216;
  --win:          #4caf50;
  --loss:         #f44336;
  --premium:      #ffd700;
  --border:       #303038;
  --sidebar-width:210px;
  --sidebar-icon: 44px;
  --header-h:     52px;
  --transition:   0.2s ease;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text-primary);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

/* ===== Layout Shell ===== */
#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===== Sidebar ===== */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border);
  transition: width var(--transition), min-width var(--transition);
  z-index: 100;
}

#sidebar-logo {
  height: var(--header-h);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 14px;
  background: var(--header-bar);
  border-bottom: 1px solid var(--border);
  gap: 10px;
  overflow: hidden;
}

#sidebar-logo .logo-icon {
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -1px;
}

#sidebar-logo .logo-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  letter-spacing: 0.5px;
}

#sidebar-logo .logo-text span {
  color: var(--accent);
}

#sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#sidebar-nav::-webkit-scrollbar { width: 4px; }
#sidebar-nav::-webkit-scrollbar-track { background: transparent; }
#sidebar-nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.nav-separator {
  padding: 12px 14px 4px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  user-select: none;
}

.nav-separator.empty {
  padding: 8px 0 0;
  border-top: 1px solid var(--border);
  margin: 4px 10px 0;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--text-primary);
  width: 100%;
  text-align: left;
  font-size: 13px;
  border-radius: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--transition), color var(--transition);
}

.nav-btn:hover {
  background: var(--sidebar-hover);
  color: #fff;
}

.nav-btn.active {
  background: var(--sidebar-active);
  color: #fff;
}

.nav-btn .nav-icon {
  font-size: 15px;
  min-width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.nav-btn .nav-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-btn .nav-badge {
  margin-left: auto;
  font-size: 9px;
  background: var(--accent);
  color: #fff;
  border-radius: 3px;
  padding: 1px 4px;
  flex-shrink: 0;
}

/* ===== Main Area ===== */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ===== Header ===== */
#header {
  height: var(--header-h);
  min-height: var(--header-h);
  background: var(--header-bar);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
}

#hamburger {
  display: none;
  border: none;
  background: none;
  color: var(--text-primary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}

#hamburger:hover { background: var(--sidebar-hover); }

#header-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

/* ===== Language Switcher ===== */
#lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: none;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.lang-btn:hover {
  background: var(--sidebar-hover);
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--sidebar-active);
  color: #fff;
  border-color: var(--accent);
}

.lang-btn .flag { font-size: 14px; }
.lang-btn .code { font-size: 11px; font-weight: 600; }

/* ===== Content Area ===== */
#content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 32px 36px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#content::-webkit-scrollbar { width: 6px; }
#content::-webkit-scrollbar-track { background: transparent; }
#content::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ===== Sections ===== */
.section {
  display: none;
  max-width: 860px;
  animation: fadeIn 0.15s ease;
}

.section.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.section-icon {
  font-size: 32px;
  line-height: 1;
  flex-shrink: 0;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 700px;
}

/* ===== Screenshot Placeholder ===== */
.screenshot-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 28px;
  position: relative;
}

.screenshot-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* No-image state */
.screenshot-placeholder.no-image img {
  display: none;
}

.screenshot-placeholder.no-image::after {
  content: '';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.screenshot-placeholder.no-image::before {
  content: var(--ph-icon, '📷');
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  font-size: 40px;
  opacity: 0.25;
  z-index: 1;
}

.ph-text {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
}

.screenshot-placeholder.no-image .ph-text {
  opacity: 1;
  padding-top: 24px;
}

.ph-text .ph-icon {
  font-size: 36px;
  opacity: 0.3;
}

/* ===== Feature List ===== */
.features-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 10px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-primary);
  font-size: 13.5px;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.feature-list li::before {
  content: '›';
  color: var(--accent);
  font-size: 16px;
  line-height: 1.2;
  flex-shrink: 0;
  font-weight: 700;
}

/* ===== Info Section ===== */
.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}

.info-card .ic-icon { font-size: 28px; margin-bottom: 8px; }
.info-card .ic-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.info-card .ic-value {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

/* ===== Download Section ===== */
.download-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition);
}

.download-btn:hover { background: var(--accent-hover); }

.download-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.download-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

/* ===== Changelog Section ===== */
.changelog-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.cl-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.cl-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--header-bar);
}

.cl-version {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
}

.cl-date {
  font-size: 12px;
  color: var(--text-secondary);
}

.cl-items {
  padding: 12px 16px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cl-items li {
  font-size: 13px;
  color: var(--text-primary);
  padding: 2px 0 2px 16px;
  position: relative;
}

.cl-items li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.cl-tag {
  display: inline-block;
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 1px 5px;
  border-radius: 3px;
  margin-right: 6px;
  vertical-align: middle;
}

.cl-tag.feat  { background: #1a3a1a; color: var(--win); }
.cl-tag.fix   { background: #3a1a1a; color: var(--loss); }
.cl-tag.impr  { background: #1a2a3a; color: #64b0f0; }

/* ===== Mobile / Responsive ===== */
#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 99;
}

@media (max-width: 768px) {
  :root { --sidebar-width: 240px; }

  #sidebar {
    position: fixed;
    left: calc(-1 * var(--sidebar-width) - 2px);
    top: 0;
    bottom: 0;
    transition: left var(--transition);
    z-index: 200;
  }

  #sidebar.open {
    left: 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }

  #sidebar-overlay.visible { display: block; }

  #hamburger { display: block; }

  #content { padding: 20px 16px; }

  #lang-switcher .code { display: none; }

  .info-cards { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  #lang-switcher .lang-btn { padding: 4px 5px; }
  .section-title { font-size: 20px; }
  .download-box { padding: 18px; }
}

/* ===== Collapsed sidebar (icon-only, desktop) ===== */
#sidebar.collapsed {
  width: var(--sidebar-icon);
  min-width: var(--sidebar-icon);
}

#sidebar.collapsed .logo-text,
#sidebar.collapsed .nav-label,
#sidebar.collapsed .nav-badge,
#sidebar.collapsed .nav-separator {
  display: none;
}

#sidebar.collapsed #sidebar-logo {
  padding: 0;
  justify-content: center;
}

#sidebar.collapsed .nav-btn {
  padding: 10px 0;
  justify-content: center;
}

#sidebar-collapse-btn {
  border: none;
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 10px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: 1px solid var(--border);
  font-size: 16px;
  transition: color var(--transition), background var(--transition);
}

#sidebar-collapse-btn:hover {
  background: var(--sidebar-hover);
  color: var(--text-primary);
}

/* ===== Tooltip for collapsed mode ===== */
#sidebar.collapsed .nav-btn {
  position: relative;
}

#sidebar.collapsed .nav-btn:hover::after {
  content: attr(data-tip);
  position: absolute;
  left: calc(var(--sidebar-icon) + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: #333;
  color: #fff;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 500;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

/* ===== Utility ===== */
.text-accent  { color: var(--accent); }
.text-win     { color: var(--win); }
.text-loss    { color: var(--loss); }
.text-premium { color: var(--premium); }
.text-secondary { color: var(--text-secondary); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}