:root {
  --bg: #f4f6f9;
  --card-bg: #ffffff;
  --text: #1a2332;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-soft: #eef2f7;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.08);
  --accent-ring: rgba(59, 130, 246, 0.18);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04),
               0 4px 14px rgba(15, 23, 42, 0.05);
  --shadow: 0 2px 4px rgba(15, 23, 42, 0.04),
            0 10px 28px rgba(15, 23, 42, 0.07);
  --shadow-glow: 0 4px 20px rgba(59, 130, 246, 0.28);
  --notif-shadow: 0 8px 24px rgba(15, 23, 42, 0.14),
                  0 2px 6px rgba(15, 23, 42, 0.08);
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --border-soft: #293548;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-soft: rgba(96, 165, 250, 0.14);
    --accent-ring: rgba(96, 165, 250, 0.24);
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25),
                 0 4px 14px rgba(0, 0, 0, 0.3);
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3),
              0 10px 28px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 4px 20px rgba(96, 165, 250, 0.32);
    --notif-shadow: 0 8px 24px rgba(0, 0, 0, 0.5),
                    0 2px 6px rgba(0, 0, 0, 0.3);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 32px 20px;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 780px; margin: 0 auto; }
.is-hidden { display: none !important; }

.hero {
  text-align: center;
  padding: 32px 16px 40px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(44px, 8vw, 72px);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  border-radius: 18px;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  padding: 26px;
  margin-bottom: 16px;
  transition: background 0.3s, border-color 0.3s;
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title-flex { justify-content: space-between; }

#resultCard { animation: cardReveal 0.35s cubic-bezier(0.22, 1, 0.36, 1); }

@keyframes cardReveal {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.input-card {
  padding: 28px;
  box-shadow: var(--shadow);
}

.input-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text);
}

.input-row { display: flex; gap: 10px; align-items: stretch; }

#input {
  flex: 1;
  min-height: 54px;
  max-height: 180px;
  padding: 15px 20px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  font-size: 14.5px;
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  resize: none;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  line-height: 1.5;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#input::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

#input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-ring);
}

#input::placeholder {
  color: var(--text-muted);
  font-size: 13.5px;
}

.btn-convert {
  flex-shrink: 0;
  align-self: stretch;
  min-width: 100px;
  padding: 0 26px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  font-family: inherit;
  box-shadow: var(--shadow-glow);
}

.btn-convert:hover {
  background: var(--accent-hover);
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.42);
}

.btn-convert:active {
  transform: translateY(1px);
}

.input-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.btn-clear {
  padding: 8px 22px;
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-clear:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.input-hint {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
}

button { font-family: inherit; }

.btn-secondary {
  padding: 8px 18px;
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-secondary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-small { padding: 6px 14px; font-size: 13px; border-radius: 8px; }

.btn-copy {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-copy:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.btn-copy.copied {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.result-item {
  background: var(--bg);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
  border: 1px solid var(--border-soft);
  animation: fadeIn 0.3s ease;
}

.result-item:last-child { margin-bottom: 0; }

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

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  gap: 12px;
  flex-wrap: wrap;
}

.result-name {
  font-weight: 700;
  font-size: 13px;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.result-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 5px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.result-latency {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 5px;
}

.tag-raw      { background: #fef3c7; color: #b45309; }
.tag-release  { background: #d1fae5; color: #047857; }
.tag-repo     { background: #dbeafe; color: #1e40af; }
.tag-clone    { background: #ede9fe; color: #6d28d9; }
.tag-other    { background: #e2e8f0; color: #475569; }

@media (prefers-color-scheme: dark) {
  .tag-raw     { background: #422006; color: #fcd34d; }
  .tag-release { background: #064e3b; color: #6ee7b7; }
  .tag-repo    { background: #1e3a8a; color: #93c5fd; }
  .tag-clone   { background: #4c1d95; color: #c4b5fd; }
  .tag-other   { background: #334155; color: #cbd5e1; }
}

.result-url {
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  word-break: break-all;
  line-height: 1.6;
}

.group-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  margin: 14px 0 8px;
}

.group-title:first-child { margin-top: 0; }

.node-list { display: flex; flex-direction: column; gap: 6px; }

.node-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  animation: fadeIn 0.25s ease;
}

.node-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.node-row label {
  flex: 1;
  font-size: 13px;
  font-family: var(--font-mono);
  cursor: pointer;
  color: var(--text);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.node-rank {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 5px;
  flex-shrink: 0;
  min-width: 28px;
  text-align: center;
}

.node-row .node-type {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--border-soft);
  color: var(--text-muted);
  flex-shrink: 0;
  font-weight: 600;
}

.node-latency {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 5px;
  min-width: 68px;
  text-align: center;
  flex-shrink: 0;
  background: var(--border-soft);
  color: var(--text-secondary);
}

.node-latency.fast,
.result-latency.fast {
  background: rgba(16, 185, 129, 0.14);
  color: var(--success);
}

.node-latency.medium,
.result-latency.medium {
  background: rgba(245, 158, 11, 0.16);
  color: #b45309;
}

.node-latency.slow,
.node-latency.fail,
.result-latency.slow,
.result-latency.fail {
  background: rgba(239, 68, 68, 0.14);
  color: var(--danger);
}

@media (prefers-color-scheme: dark) {
  .node-latency.medium,
  .result-latency.medium { color: var(--warning); }
}

.panel-hint {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.6;
}

.panel-hint.testing { color: var(--accent); }

.panel-hint.testing::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  margin-left: 6px;
  vertical-align: middle;
  animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.2; }
}

.panel-hint.done { color: var(--success); }
.panel-hint.fail { color: var(--danger); }

.skeleton-list { display: flex; flex-direction: column; gap: 6px; }

.skeleton-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--border-soft);
}

.skeleton-bar {
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(
    90deg,
    var(--border-soft) 0%,
    rgba(59, 130, 246, 0.1) 50%,
    var(--border-soft) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-bar.rank { width: 28px; height: 18px; flex-shrink: 0; }
.skeleton-bar.name { flex: 1; }
.skeleton-bar.time { width: 68px; height: 18px; flex-shrink: 0; }

.notification {
  position: fixed;
  top: 20px;
  left: 20px;
  max-width: 340px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--card-bg);
  border-radius: 14px;
  border: 1px solid var(--border-soft);
  box-shadow: var(--notif-shadow);
  z-index: 1000;
  opacity: 0;
  transform: translateX(-120%);
  pointer-events: none;
  transition: opacity 0.35s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.notification.show {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.notif-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  background: var(--success);
}

.notif-icon.error { background: var(--danger); }
.notif-icon.warn  { background: var(--warning); }

.notif-body { flex: 1; min-width: 0; }

.notif-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
  line-height: 1.4;
}

.notif-desc {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  word-break: break-word;
}

.notif-close {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}

.notif-close:hover {
  background: var(--bg);
  color: var(--text);
}

.faq-list { display: flex; flex-direction: column; gap: 8px; }

.faq-item {
  background: var(--bg);
  border-radius: 12px;
  border: 1px solid var(--border-soft);
  overflow: hidden;
}

.faq-item:hover { border-color: var(--accent); }
.faq-item[open] { border-color: var(--accent); }

.faq-item summary {
  padding: 13px 42px 13px 16px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
  transition: background 0.15s;
  position: relative;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::before {
  content: "▸";
  font-size: 13px;
  color: var(--accent);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  width: 12px;
}

.faq-item[open] summary::before { transform: rotate(90deg); }
.faq-item summary:hover { background: var(--accent-soft); }

.faq-answer {
  padding: 4px 16px 16px 40px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.faq-answer p { margin-bottom: 10px; }
.faq-answer p:last-child { margin-bottom: 0; }
.faq-answer ul { margin: 8px 0 10px 0; padding-left: 20px; }
.faq-answer li { margin-bottom: 6px; }
.faq-answer strong { color: var(--text); font-weight: 700; }

.faq-answer code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
}

.faq-answer pre {
  background: var(--card-bg);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 8px 0 10px;
  overflow-x: auto;
}

.faq-answer pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 12px;
  line-height: 1.65;
}

.footer {
  text-align: center;
  padding: 20px 16px 8px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.8;
}

.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--text);
  color: var(--bg);
  padding: 11px 22px;
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.28);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
  z-index: 999;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 640px) {
  body { padding: 20px 14px; }
  .hero { padding: 20px 8px 28px; }
  .hero-desc { font-size: 14px; }
  .input-card { padding: 22px 20px; }
  .input-row { flex-direction: column; align-items: stretch; }
  #input { min-height: 54px; }
  .btn-convert {
    width: 100%;
    min-height: 50px;
    padding: 0 24px;
    align-self: auto;
  }
  .notification { left: 12px; right: 12px; max-width: none; }
  .card { padding: 20px; }
}