:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #5b6472;
  --border: #e5e8ef;
  --accent: #4f8cff;
  --accent-2: #8b5cf6;
  --grad: linear-gradient(135deg, #4f8cff, #8b5cf6);
  --shadow: 0 10px 30px rgba(31, 45, 90, .10);
}

html, body {
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  color: inherit;
}

.logo-mark {
  width: 40px;
  height: 40px;
  display: block;
}

.logo-word {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -.02em;
}

.lang-nav {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--muted);
  font-size: .9rem;
}

.lang-nav select {
  padding: .35rem .5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: .9rem;
  cursor: pointer;
}

.main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
}

.ip-card {
  width: 100%;
  max-width: 560px;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow);
}

.ip-card .lead {
  margin: 0 0 1.2rem;
  color: var(--muted);
}

.ip-display {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  margin-bottom: 1.4rem;
}

.ip-input-wrap {
  position: relative;
  width: 100%;
  max-width: 480px;
}

.ip-input {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: .01em;
  text-align: center;
  color: var(--text);
  caret-color: var(--accent);
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: .9rem 3.4rem .9rem 1.2rem;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, .04), var(--shadow);
  transition: border-color .15s ease, box-shadow .15s ease;
}

.ip-input:hover { border-color: #c9d2e6; }

.ip-input:focus, .ip-input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(79, 140, 255, .18), var(--shadow);
}

.ip-copy {
  position: absolute;
  top: 50%;
  right: .55rem;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.3rem;
  height: 2.3rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text);
  background: var(--border);
  transition: background .15s ease, color .15s ease, transform .12s ease;
}

.ip-copy:hover { background: var(--accent); color: #fff; }
.ip-copy:active { transform: translateY(-50%) scale(.92); }
.ip-copy:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.ip-copy svg { width: 1.15rem; height: 1.15rem; fill: currentColor; }

.ip-copy .icon-check { display: none; }

.ip-copy.copied { background: #22c55e; color: #fff; }
.ip-copy.copied .icon-copy { display: none; }
.ip-copy.copied .icon-check { display: block; }

.ip-details {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  margin: 1.1rem 0 0;
  font-size: .92rem;
  color: var(--muted);
}

.ip-detail-label { font-weight: 600; color: var(--text); }

.ip-actions {
  display: flex;
  justify-content: center;
  gap: .6rem;
  margin-top: 1.3rem;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  color: var(--muted);
  background: var(--card);
  transition: color .15s ease, border-color .15s ease, transform .12s ease;
}

.btn-icon:hover { color: var(--accent); border-color: var(--accent); }
.btn-icon:active { transform: scale(.92); }
.btn-icon:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-icon[aria-expanded="true"] { color: #fff; background: var(--grad); border-color: transparent; }

.btn-icon svg { width: 1.2rem; height: 1.2rem; fill: currentColor; }

.qr-panel {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
}

.qr-panel[hidden] { display: none; }

.qr-panel-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .8rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.qr-panel-inner svg { display: block; width: 200px; height: 200px; }

.btn-ghost {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: 10px;
  padding: .5rem 1.2rem;
  font-size: .9rem;
  cursor: pointer;
}

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

.share-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.3rem;
  font-size: .9rem;
}

.share-label { color: var(--muted); }

.share-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .35rem .8rem;
  transition: color .15s ease, border-color .15s ease;
}

.share-link:hover { color: var(--accent); border-color: var(--accent); }

.share-link svg { width: .95rem; height: .95rem; fill: currentColor; }

.ip-version {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: .15rem .55rem;
}

.about-content { max-width: 640px; margin: 0 auto; }
.about-content h1 { font-size: 1.6rem; }
.about-content p { color: var(--muted); line-height: 1.6; }

.site-footer {
  text-align: center;
  padding: 1.2rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
}

.site-footer a { color: var(--muted); text-decoration: underline; }