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

:root {
  --bg: #0f1115;
  --card-bg: #1a1d24;
  --border: #2a2e38;
  --accent: #ff9f40;
  --text: #e8e8e8;
  --muted: #9aa0aa;
}

:root[data-theme="light"] {
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --border: #e2e4e9;
  --accent: #d97706;
  --text: #1a1d24;
  --muted: #666b76;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f6f8;
    --card-bg: #ffffff;
    --border: #e2e4e9;
    --accent: #d97706;
    --text: #1a1d24;
    --muted: #666b76;
  }
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: background 0.2s, color 0.2s;
}

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

header {
  text-align: center;
  padding: 3rem 1rem 1.5rem;
}

header h1 {
  font-size: 2.25rem;
}

.tagline {
  color: var(--muted);
  margin-top: 0.5rem;
}

main {
  width: 100%;
  max-width: 480px;
  padding: 0 1rem;
  flex: 1;
}

.ip-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.label {
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.ip-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.ip-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  word-break: break-all;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
  cursor: pointer;
}

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

.details {
  margin-top: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

.row:last-child {
  border-bottom: none;
}

.key {
  color: var(--muted);
  flex-shrink: 0;
}

.val {
  text-align: right;
  word-break: break-word;
}

.speedtest {
  margin-top: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.speedtest-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.speedtest-header h2 {
  font-size: 1.1rem;
}

.run-btn {
  background: var(--accent);
  color: #14151a;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-weight: 600;
  cursor: pointer;
}

.run-btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.speedtest-results {
  display: flex;
  gap: 1rem;
}

.stat {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  text-align: center;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.stat-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
}

.speedtest-status {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  min-height: 1.2em;
}

.headers-section {
  margin: 1.5rem 0 2rem;
}

.toggle-headers-btn {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  text-align: left;
  cursor: pointer;
  font-size: 0.9rem;
}

.headers-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  font-size: 0.8rem;
}

.headers-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.headers-table tr:last-child td {
  border-bottom: none;
}

.header-key {
  color: var(--muted);
  white-space: nowrap;
  width: 1%;
}

.header-val {
  word-break: break-all;
}

footer {
  padding: 2rem 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}