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

/* Light theme (default) */
:root {
  --bg: #fafafa;
  --surface: #fff;
  --border: #ddd;
  --text: #1a1a1a;
  --text-secondary: #555;
  --accent: #0066cc;
  --accent-hover: #0052a3;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
  --success-bg: #f0fdf4;
  --success-text: #166534;
  --warning-bg: #fffbeb;
  --warning-text: #92400e;
  --header-color: #d63384;
  --payload-color: #0d6efd;
  --signature-color: #198754;
  --radius: 6px;
}

/* Dark theme values */
[data-theme="dark"] {
  --bg: #111;
  --surface: #1a1a1a;
  --border: #333;
  --text: #e5e5e5;
  --text-secondary: #999;
  --accent: #4da3ff;
  --accent-hover: #7dbdff;
  --error-bg: #2d1515;
  --error-text: #f87171;
  --success-bg: #0d2818;
  --success-text: #4ade80;
  --warning-bg: #2d1f06;
  --warning-text: #fbbf24;
  --header-color: #f472b6;
  --payload-color: #60a5fa;
  --signature-color: #34d399;
}

/* System preference when no explicit choice */
@media (prefers-color-scheme: dark) {
  [data-theme="system"] {
    --bg: #111;
    --surface: #1a1a1a;
    --border: #333;
    --text: #e5e5e5;
    --text-secondary: #999;
    --accent: #4da3ff;
    --accent-hover: #7dbdff;
    --error-bg: #2d1515;
    --error-text: #f87171;
    --success-bg: #0d2818;
    --success-text: #4ade80;
    --warning-bg: #2d1f06;
    --warning-text: #fbbf24;
    --header-color: #f472b6;
    --payload-color: #60a5fa;
    --signature-color: #34d399;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

main {
  max-width: 700px;
  margin: 0 auto;
  padding: 3rem 1rem;
}

/* Top bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

#theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
}

#theme-toggle:hover {
  color: var(--text);
  border-color: var(--text-secondary);
}

.subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

/* Explainer */
.explainer {
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.explainer p + p {
  margin-top: 0.5rem;
}

/* Input */
.input-group {
  margin-bottom: 1rem;
}

#jwt-input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  font-size: 0.9rem;
  font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  outline: none;
  resize: vertical;
  word-break: break-all;
}

#jwt-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

/* Error */
#error {
  margin-bottom: 1rem;
  padding: 0.8rem 1rem;
  background: var(--error-bg);
  color: var(--error-text);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

/* Token preview - color coded */
.token-preview {
  margin-bottom: 1rem;
  padding: 0.8rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.8rem;
  font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  word-break: break-all;
  white-space: pre-wrap;
  line-height: 1.6;
}

.token-preview .token-header {
  color: var(--header-color);
}

.token-preview .token-dot {
  color: var(--text-secondary);
}

.token-preview .token-payload {
  color: var(--payload-color);
}

.token-preview .token-signature {
  color: var(--signature-color);
}

/* Results */
#results {
  margin-top: 0.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin-bottom: 1rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.copy-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  white-space: nowrap;
}

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

.json-block {
  padding: 1rem;
  background: var(--bg);
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.5;
}

.signature-block {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.sig-note {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Claims info */
.claims-info {
  margin-top: 0.75rem;
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
}

.claim-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.3rem 0;
  font-size: 0.85rem;
}

.claim-row + .claim-row {
  border-top: 1px solid var(--border);
}

.claim-name {
  font-weight: 600;
  font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  font-size: 0.8rem;
  white-space: nowrap;
  min-width: 3rem;
}

.claim-desc {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.claim-value {
  margin-left: auto;
  font-size: 0.8rem;
  white-space: nowrap;
}

.claim-value.expired {
  color: var(--error-text);
  font-weight: 600;
}

.claim-value.valid {
  color: var(--success-text);
  font-weight: 600;
}

.claim-value.not-yet {
  color: var(--warning-text);
  font-weight: 600;
}

/* Expiry banner */
.expiry-banner {
  margin-bottom: 1rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}

.expiry-banner.expired {
  background: var(--error-bg);
  color: var(--error-text);
}

.expiry-banner.valid {
  background: var(--success-bg);
  color: var(--success-text);
}

.expiry-banner.not-yet {
  background: var(--warning-bg);
  color: var(--warning-text);
}

/* Footer */
footer {
  max-width: 700px;
  margin: 2rem auto 0;
  padding: 1rem 1rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Utility */
.hidden {
  display: none !important;
}

@media (max-width: 500px) {
  .claim-row {
    flex-wrap: wrap;
  }

  .claim-value {
    margin-left: 0;
    width: 100%;
  }
}