/* ===== Reset & Variables ===== */
:root {
  --bg: #fafbfc;
  --surface: #ffffff;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 20px 40px -12px rgba(0,0,0,0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.3px;
}

.brand-icon {
  width: 26px;
  height: 26px;
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-links a {
  padding: 8px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  transition: all var(--transition);
}

.nav-links a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 80px 24px 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(79,70,229,0.08), transparent),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(14,165,233,0.06), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
  line-height: 1.15;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 50%, #0ea5e9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-weight: 400;
}

/* ===== Search Card ===== */
.search-card {
  max-width: 560px;
  margin: 0 auto;
}

.search-box {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(79,70,229,0.1);
}

.search-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  margin: 14px 0 14px 14px;
  flex-shrink: 0;
}

.ip-input {
  flex: 1;
  padding: 12px 12px;
  border: none;
  background: transparent;
  font-size: 16px;
  color: var(--text);
  outline: none;
  min-width: 0;
}

.ip-input::placeholder {
  color: var(--text-muted);
}

.search-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.search-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -6px rgba(79,70,229,0.4);
}

.search-btn:active {
  transform: translateY(0);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.error-msg {
  color: #ef4444;
  margin-top: 10px;
  font-size: 13px;
  min-height: 20px;
  font-weight: 500;
}

/* ===== Result Section ===== */
.result-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
  animation: fadeInUp 0.5s ease;
}

.result-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 32px;
}

.result-header h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.result-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
}

/* ===== Result Cards ===== */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.result-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: all var(--transition);
}

.result-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-icon svg {
  width: 22px;
  height: 22px;
}

.icon-continent { background: #eef2ff; color: #4f46e5; }
.icon-country   { background: #fef3c7; color: #d97706; }
.icon-region    { background: #d1fae5; color: #059669; }
.icon-district  { background: #ede9fe; color: #7c3aed; }
.icon-coord     { background: #fce7f3; color: #db2777; }
.icon-time      { background: #e0f2fe; color: #0284c7; }
.icon-currency  { background: #fff7ed; color: #ea580c; }
.icon-isp       { background: #f0fdf4; color: #16a34a; }
.icon-as        { background: #fef2f2; color: #dc2626; }
.icon-org       { background: #f5f5f4; color: #78716c; }
.icon-reverse   { background: #ecfeff; color: #0891b2; }
.icon-network   { background: #fdf2f8; color: #be185d; }

.card-body {
  min-width: 0;
}

.card-label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.3px;
  margin-bottom: 2px;
}

.card-value {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

/* ===== Map Button ===== */
.map-section {
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.map-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: var(--surface);
  color: var(--primary);
  text-decoration: none;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
}

.map-btn svg {
  width: 20px;
  height: 20px;
}

.map-btn .arrow-right {
  width: 16px;
  height: 16px;
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition);
}

.map-btn:hover {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px -6px rgba(79,70,229,0.4);
  transform: translateY(-2px);
}

.map-btn:hover .arrow-right {
  opacity: 1;
  transform: translateX(0);
}

/* ===== Loading ===== */
.loading {
  text-align: center;
  padding: 80px 24px;
  animation: fadeIn 0.3s ease;
}

.spinner {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  position: relative;
}

.spinner-ring {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--primary), #7c3aed, #0ea5e9, var(--primary));
  animation: spin 1s linear infinite;
  mask: radial-gradient(transparent 60%, #000 61%);
  -webkit-mask: radial-gradient(transparent 60%, #000 61%);
}

.loading p {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ===== Footer ===== */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-content p {
  color: var(--text-muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 8px;
  align-items: center;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

.divider {
  color: var(--border);
  font-size: 12px;
}

/* ===== Page Layout (about/privacy) ===== */
.page-main {
  max-width: 740px;
  margin: 0 auto;
  padding: 56px 24px 80px;
  flex: 1;
}

.page-main h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-main .update-date {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 48px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.page-main section {
  margin-bottom: 40px;
}

.page-main h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
  letter-spacing: -0.3px;
}

.page-main p {
  margin-bottom: 10px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.page-main ul {
  padding-left: 20px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.page-main ul li {
  margin-bottom: 8px;
}

.page-main a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.page-main a:hover {
  text-decoration: underline;
}

/* ===== Hidden ===== */
.hidden { display: none; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 34px;
  }

  .hero {
    padding: 48px 20px 40px;
  }

  .hero-desc {
    font-size: 16px;
    margin-bottom: 28px;
  }

  .search-box {
    flex-direction: column;
    padding: 8px;
    gap: 8px;
  }

  .search-icon {
    display: none;
  }

  .ip-input {
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
  }

  .search-btn {
    justify-content: center;
    border-radius: var(--radius-sm);
  }

  .result-grid {
    grid-template-columns: 1fr;
  }

  .result-header {
    flex-direction: column;
    gap: 8px;
  }

  .page-main {
    padding: 40px 20px 60px;
  }

  .page-main h1 {
    font-size: 28px;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}