:root {
  /* Dynamic themes using CSS variables */
  --primary: #7C3AED;
  --primary-hover: #6D28D9;
  --accent: #C084FC;
  
  --red: #FB7185;
  --purple: #C084FC;
  --cyan: #22D3EE;
  
  --success: #10B981;
  --danger: #F43F5E;
  
  /* Shared Base */
  --border-radius: 12px;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-color: rgba(0, 0, 0, 0.3);
  
  /* Dark Mode Default */
  --bg-color: #0F0A1A;
  --surface-color: rgba(30, 20, 45, 0.6);
  --surface-border: rgba(255, 255, 255, 0.1);
  --text-primary: #F8FAFC;
  --text-muted: #94A3B8;
  --input-bg: rgba(15, 10, 26, 0.7);
  --hover-bg: rgba(255, 255, 255, 0.05);
}

.light-mode {
  --bg-color: #F8FAFC;
  --surface-color: rgba(255, 255, 255, 0.8);
  --surface-border: rgba(0, 0, 0, 0.1);
  --text-primary: #0F172A;
  --text-muted: #64748B;
  --input-bg: rgba(255, 255, 255, 0.9);
  --hover-bg: rgba(0, 0, 0, 0.05);
  --shadow-color: rgba(0, 0, 0, 0.05);

  --red: #E11D48;
  --purple: #7C3AED;
  --cyan: #0891B2;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* Utilities */
.hidden { display: none !important; }
.text-red { color: var(--red); }
.text-purple { color: var(--purple); }
.text-cyan { color: var(--cyan); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* Glassmorphism */
.glass-panel {
  background: var(--surface-color);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  box-shadow: 0 8px 32px var(--shadow-color);
  border-radius: var(--border-radius);
}

/* Layout */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  border-radius: 0;
  border-top: none;
  border-left: none;
  border-right: none;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--primary);
}

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  transition: all 0.3s ease;
}

.container.compare-active {
  grid-template-columns: 1fr 1fr;
}

/* Editor Pane */
.editor-pane {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0; /* fixes grid overflow */
}

/* Encoded Text Section */
.encoded-section {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.encoded-text {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1.5;
  width: 100%;
  padding: 1.5rem;
  background: var(--input-bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  word-break: break-all;
  white-space: pre-wrap;
  min-height: 100px;
  outline: none;
  transition: border-color var(--transition);
}

.encoded-text:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

/* JWT Color Coding */
.jwt-header { color: var(--red); }
.jwt-payload { color: var(--purple); }
.jwt-signature { color: var(--cyan); }
.jwt-dot { color: var(--text-muted); font-weight: bold; }

/* Decoded Configs */
.decoded-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.editor-box {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.json-editor {
  width: 100%;
  min-height: 150px;
  background: var(--input-bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.4;
  padding: 1rem;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
}

.json-editor.invalid {
  border-color: var(--danger);
}

.json-editor:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.box-header .json-editor { color: var(--red); min-height: 120px; }
.box-payload .json-editor { color: var(--purple); min-height: 250px; }

/* Signature Box */
.signature-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.glass-select {
  background: var(--input-bg);
  border: 1px solid var(--cyan);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
}

.key-editor {
  color: var(--cyan);
  min-height: 80px;
}

.verify-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: var(--input-bg);
}

.verify-status.ok { color: var(--success); border: 1px solid var(--success); }
.verify-status.fail { color: var(--danger); border: 1px solid var(--danger); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-family: var(--font-family);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-sm { padding: 0.5rem 1rem; font-size: 0.8rem; }

.btn-outline {
  background: transparent;
  border-color: var(--surface-border);
  color: var(--text-primary);
}

.btn-outline:hover, .btn-outline.active {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(124, 58, 237, 0.1);
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.icon-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

/* Expiry Timer */
.expiry-timer {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: var(--input-bg);
  border: 1px solid var(--surface-border);
  transition: var(--transition);
}
.expiry-timer.expired {
  color: var(--danger);
  border-color: var(--danger);
}
.expiry-timer.valid {
  color: var(--success);
  border-color: var(--success);
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 500px;
  padding: 2rem;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: var(--text-primary);
  color: var(--bg-color);
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  z-index: 2000;
  transition: transform 0.3s, opacity 0.3s;
}

.toast.hidden {
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  pointer-events: none;
  display: block !important;
}

/* Responsive */
@media (max-width: 1024px) {
  .container.compare-active {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 600px) {
  .nav-controls .btn {
    display: none;
  }
}