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

/* ---- Theme variables ---- */
:root {
  --color-bg: #13171e;
  --color-surface: #1c2128;
  --color-primary: #0d1117;
  --color-accent: #58a6ff;
  --color-accent-hover: #79b8ff;
  --color-text: #e6edf3;
  --color-text-light: #8b949e;
  --color-border: #30363d;
  --color-shadow: rgba(0, 0, 0, 0.4);
  --radius: 8px;

  /* Code blocks */
  --color-code-bg: #161b22;
  --color-code-inline: #f0883e;

  /* Diff */
  --color-diff-added-bg: #0f2d1a;
  --color-diff-added-num: #133a1f;
  --color-diff-added-text: #3fb950;
  --color-diff-added-char: rgba(63, 185, 100, 0.4);
  --color-diff-removed-bg: #3d1214;
  --color-diff-removed-num: #4d1519;
  --color-diff-removed-text: #f85149;
  --color-diff-removed-char: rgba(248, 81, 73, 0.4);
  --color-diff-empty: #161b22;

  /* JSON syntax */
  --color-json-key: #ffb074;
  --color-json-string: #a5d6ff;
  --color-json-number: #79c0ff;
  --color-json-bool: #f85149;
  --color-json-null: #8b949e;

  /* JWT panels */
  --color-jwt-header-bg: #1e3a5f;
  --color-jwt-header-text: #79b8ff;
  --color-jwt-payload-bg: #2d1b69;
  --color-jwt-payload-text: #b392f0;
  --color-jwt-signature-bg: #5c1a3e;
  --color-jwt-signature-text: #f097b2;

  /* Status */
  --color-error: #f85149;
  --color-success: #3fb950;
  --color-success-bg: #0f2d1a;
  --color-error-bg: #3d1214;
}

[data-theme="light"] {
  --color-bg: #f0f2f5;
  --color-surface: #ffffff;
  --color-primary: #1c2128;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-border: #d1d5db;
  --color-shadow: rgba(0, 0, 0, 0.08);

  /* Code blocks */
  --color-code-bg: #f6f8fa;
  --color-code-inline: #d35400;

  /* Diff */
  --color-diff-added-bg: #dafbe1;
  --color-diff-added-num: #c6f2cf;
  --color-diff-added-text: #116329;
  --color-diff-added-char: rgba(17, 99, 41, 0.25);
  --color-diff-removed-bg: #ffebe9;
  --color-diff-removed-num: #ffd7d5;
  --color-diff-removed-text: #82071e;
  --color-diff-removed-char: rgba(130, 7, 30, 0.25);
  --color-diff-empty: #f6f8fa;

  /* JSON syntax */
  --color-json-key: #953800;
  --color-json-string: #0550ae;
  --color-json-number: #0550ae;
  --color-json-bool: #cf222e;
  --color-json-null: #6e7781;

  /* JWT panels */
  --color-jwt-header-bg: #dbeafe;
  --color-jwt-header-text: #1e40af;
  --color-jwt-payload-bg: #ede9fe;
  --color-jwt-payload-text: #5b21b6;
  --color-jwt-signature-bg: #fce7f3;
  --color-jwt-signature-text: #9d174d;

  /* Status */
  --color-error: #dc2626;
  --color-success: #16a34a;
  --color-success-bg: #dcfce7;
  --color-error-bg: #fef2f2;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ---- Header ---- */
header {
  background: var(--color-primary);
  color: white;
  padding: 0.75rem 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

header a {
  color: white;
  text-decoration: none;
}

header .site-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

header .back-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  opacity: 0.7;
  transition: opacity 0.15s;
}

header .back-link:hover {
  opacity: 1;
}

header .back-link svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.header-spacer {
  flex: 1;
}

/* Theme toggle */
.theme-toggle {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  padding: 5px 7px;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  line-height: 1;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  color: white;
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---- Main ---- */
main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

h1 {
  margin-bottom: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ---- Page title bar with share button ---- */
.page-title-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.page-title-bar h1 {
  margin-bottom: 0;
}

/* ---- Input wrapper with clear icon ---- */
.input-wrap {
  position: relative;
}

.input-wrap textarea {
  padding-right: 2.5rem;
}

.clear-icon {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 4px;
  cursor: pointer;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  line-height: 1;
}

.clear-icon:hover {
  color: var(--color-error);
  border-color: var(--color-error);
  background: var(--color-bg);
}

.clear-icon svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---- Home page tool grid ---- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.tool-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-shadow);
  transform: translateY(-1px);
}

.tool-card h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-accent);
  letter-spacing: -0.01em;
}

.tool-card p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ---- Tool page shared styles ---- */
.tool-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

textarea {
  width: 100%;
  min-height: 150px;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  resize: vertical;
  margin-bottom: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

[data-theme="light"] textarea:focus {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

input[type="text"],
input[type="number"],
select {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

[data-theme="light"] input[type="text"]:focus,
[data-theme="light"] input[type="number"]:focus,
[data-theme="light"] select:focus {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.output-area pre {
  color: var(--color-text);
}

button {
  background: var(--color-accent);
  color: white;
  border: none;
  padding: 0.5rem 1.1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

button:hover {
  background: var(--color-accent-hover);
}

button:active {
  transform: scale(0.97);
}

.btn-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
  color: var(--color-text-light);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.output-area {
  margin-top: 1rem;
}

.output-area pre {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.75rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  min-height: 80px;
}

/* ---- Copy icon ---- */
.output-wrap {
  position: relative;
}

.copy-icon {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 5px;
  cursor: pointer;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  line-height: 1;
}

.copy-icon:hover {
  color: var(--color-text);
  border-color: var(--color-text-light);
  background: var(--color-bg);
}

.copy-icon.copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

.copy-icon svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---- Clear / secondary button ---- */
.btn-clear {
  background: transparent;
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.btn-clear:hover {
  color: var(--color-text);
  border-color: var(--color-text-light);
  background: transparent;
}

/* ---- Toast ---- */
.toast {
  position: fixed;
  top: 1rem;
  right: 1rem;
  transform: translateX(20px);
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
  box-shadow: 0 8px 24px var(--color-shadow);
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

/* ---- Footer ---- */
footer {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
  font-size: 0.75rem;
  color: var(--color-text-light);
  letter-spacing: 0.02em;
}

/* ---- Shared status colors ---- */
.error-msg {
  color: var(--color-error);
  font-weight: 600;
  margin-top: 0.5rem;
}

.match-msg {
  color: var(--color-success);
  font-weight: 600;
  margin-top: 0.5rem;
}

/* ---- Shared diff styles ---- */
.diff-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: auto;
  margin-top: 0.5rem;
}

.diff-side {
  overflow: auto;
}

.diff-side:first-child {
  border-right: 2px solid var(--color-border);
}

.diff-side-header {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 10px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-light);
}

.diff-line {
  display: flex;
  white-space: pre;
  line-height: 1.5;
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  min-height: 1.5em;
}

.diff-line-num {
  width: 36px;
  min-width: 36px;
  text-align: right;
  padding: 0 6px 0 4px;
  color: var(--color-text-light);
  user-select: none;
  border-right: 1px solid var(--color-border);
}

.diff-line-content {
  padding: 0 8px;
  flex: 1;
}

.diff-line.added { background: var(--color-diff-added-bg); }
.diff-line.added .diff-line-num { background: var(--color-diff-added-num); color: var(--color-diff-added-text); }
.diff-line.added .diff-line-content { color: var(--color-diff-added-text); }

.diff-line.removed { background: var(--color-diff-removed-bg); }
.diff-line.removed .diff-line-num { background: var(--color-diff-removed-num); color: var(--color-diff-removed-text); }
.diff-line.removed .diff-line-content { color: var(--color-diff-removed-text); }

.diff-line.empty { background: var(--color-diff-empty); }
.diff-line.empty .diff-line-num { background: var(--color-diff-empty); }

.diff-line.unchanged { background: var(--color-surface); }

.diff-summary { margin-bottom: 0.5rem; }
.diff-stat-added { color: var(--color-diff-added-text); }
.diff-stat-removed { color: var(--color-diff-removed-text); }

/* Intra-line char highlights inside a paired removed/added line */
.diff-char-removed {
  background: var(--color-diff-removed-char);
  border-radius: 2px;
  font-weight: 600;
}
.diff-char-added {
  background: var(--color-diff-added-char);
  border-radius: 2px;
  font-weight: 600;
}

/* ---- Shared JSON syntax colors ---- */
.json-key { color: var(--color-json-key); }
.json-string { color: var(--color-json-string); }
.json-number { color: var(--color-json-number); }
.json-bool { color: var(--color-json-bool); }
.json-null { color: var(--color-json-null); }