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

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --gradient-start: #6366f1;
  --gradient-mid: #8b5cf6;
  --gradient-end: #d946ef;
  --accent: #8b5cf6;
  --accent-hover: #7c3aed;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(139, 92, 246, 0.2);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --glow: rgba(139, 92, 246, 0.4);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh; /* Dynamic viewport height for mobile browsers */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 60%, rgba(217, 70, 239, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
  animation: aurora 15s ease-in-out infinite;
}

@keyframes aurora {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, 2%) rotate(1deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

/* CTA Button */
.cta-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.cta-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem 3rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  border: none;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 24px rgba(139, 92, 246, 0.4),
              0 0 0 0 rgba(139, 92, 246, 0.4);
  overflow: hidden;
}

.cta-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(139, 92, 246, 0.5),
              0 0 0 4px rgba(139, 92, 246, 0.2);
}

.cta-btn:hover::before {
  left: 100%;
}

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

.cta-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.cta-btn svg {
  width: 24px;
  height: 24px;
}

.cta-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Features */
.features {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 4rem;
  flex-wrap: wrap;
}

.feature {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(139, 92, 246, 0.1);
  border-radius: 10px;
  color: var(--accent);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

/* Main Content */
.main-content {
  max-width: 700px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

/* Session Info */
.session-info {
  display: none;
}

.session-info.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

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

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  backdrop-filter: blur(10px);
  transition: border-color 0.3s;
}

.card:hover {
  border-color: rgba(139, 92, 246, 0.35);
}

.card-highlight {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(217, 70, 239, 0.05));
  border-color: rgba(139, 92, 246, 0.3);
}

.card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  font-weight: 600;
}

.section-title svg {
  opacity: 0.7;
}

/* IP Result Card */
.ip-waiting {
  text-align: center;
  padding: 2rem 1rem;
}

.ip-waiting-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 158, 11, 0.1);
  border-radius: 50%;
  color: var(--warning);
  animation: pulse-icon 2s infinite;
}

.ip-waiting-icon svg {
  width: 28px;
  height: 28px;
}

@keyframes pulse-icon {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.8; }
}

.ip-waiting p {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--warning);
  margin-bottom: 0.5rem;
}

.ip-waiting-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ip-detected {
  text-align: center;
  padding: 1.5rem 1rem;
}

.ip-address {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  text-shadow: 0 0 30px rgba(16, 185, 129, 0.3);
}

.ip-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.ip-separator {
  opacity: 0.3;
}

/* Download Grid */
.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  border: none;
}

.btn-large {
  padding: 1rem 1.5rem;
  font-size: 0.95rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: white;
  box-shadow: 0 2px 12px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(139, 92, 246, 0.2);
  border-color: var(--accent);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--accent);
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
}

.btn-icon:hover {
  background: rgba(139, 92, 246, 0.2);
  border-color: var(--accent);
}

.btn-icon-small {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

/* Code Block */
.code-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 0.875rem 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-secondary);
  word-break: break-all;
  margin-top: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  line-height: 1.5;
}

.code-block:hover {
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.05);
}

/* API Endpoint */
.api-endpoint {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.api-url-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 0.5rem 0.5rem 0.5rem 1rem;
}

.api-url {
  flex: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.api-curl {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 0.5rem;
}

.api-curl-label {
  padding: 0.25rem 0.5rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 4px;
  text-transform: uppercase;
}

.api-curl-code {
  flex: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* JSON Preview */
.json-preview {
  margin-top: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
}

.json-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 1rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.json-actions {
  display: flex;
  gap: 0.375rem;
}

.json-code {
  padding: 1rem;
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary);
  overflow-x: auto;
  max-height: 200px;
}

.json-code code {
  color: inherit;
}

/* JSON Syntax Highlighting */
.json-key {
  color: #93c5fd;
}

.json-string {
  color: #86efac;
}

.json-number {
  color: #fcd34d;
}

.json-boolean, .json-null {
  color: #f472b6;
}

/* Collapsible Card */
.card-collapsible {
  padding: 0;
}

.card-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  cursor: pointer;
  list-style: none;
}

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

.card-summary .section-title {
  margin-bottom: 0;
}

.card-summary .chevron {
  color: var(--text-muted);
  transition: transform 0.2s;
}

details[open] .chevron {
  transform: rotate(180deg);
}

.card-details {
  padding: 0 1.5rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

/* Info Rows */
.info-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

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

.info-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.info-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  text-align: right;
  word-break: break-all;
  margin-left: 1rem;
  color: var(--text-primary);
}

/* Updates List */
.updates-list {
  max-height: 250px;
  overflow-y: auto;
}

.update-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.625rem 0.75rem;
  border-radius: 8px;
  margin-bottom: 0.375rem;
  background: rgba(255,255,255,0.02);
  transition: background 0.2s;
}

.update-item:hover {
  background: rgba(139, 92, 246, 0.05);
}

.update-ip {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.update-time {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* New Session Button */
.new-session-btn {
  width: 100%;
  margin-top: 0.5rem;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-secondary);
  padding: 1rem;
}

.new-session-btn:hover {
  background: rgba(139, 92, 246, 0.05);
  border-color: var(--accent);
  color: var(--accent);
}

/* Toast */
.copy-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--success);
  padding: 0.875rem 1.5rem;
  border-radius: 12px;
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  color: var(--success);
  z-index: 1000;
}

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

/* Hide hero when session active */
.hero.hidden {
  display: none;
}

/* Language Selector */
.lang-selector {
  position: fixed;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 100;
}

.lang-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: rgba(26, 26, 36, 0.8);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  backdrop-filter: blur(10px);
  opacity: 0.6;
}

.lang-btn:hover {
  opacity: 1;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.lang-btn.active {
  opacity: 1;
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.15);
}

.lang-btn svg {
  border-radius: 4px;
  overflow: hidden;
}

/* Responsive */
@media (max-width: 640px) {
  .hero {
    min-height: 100vh;
    min-height: 100dvh;
    padding: 2rem 1.5rem;
  }

  .main-content {
    padding: 2rem 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .features {
    gap: 1.5rem;
  }

  .feature span {
    display: none;
  }

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

  .cta-btn {
    padding: 1rem 2rem;
    font-size: 1rem;
  }

  .ip-address {
    font-size: 1.75rem;
  }

  .api-url-row,
  .api-curl {
    flex-wrap: wrap;
  }

  .api-url,
  .api-curl-code {
    width: 100%;
    flex: unset;
    margin-bottom: 0.5rem;
  }
}