/* ─── Custom properties ────────────────────────────────────────────────────── */
:root {
  --color-bg:       #f8f9fa;
  --color-surface:  #ffffff;
  --color-border:   #dee2e6;
  --color-primary:  #0d6efd;
  --color-primary-hover: #0b5ed7;
  --color-text:     #212529;
  --color-muted:    #6c757d;
  --color-error:    #dc3545;
  --color-success:  #198754;
  --color-code-bg:  #f1f3f5;

  --radius:         6px;
  --shadow:         0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --font:           system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono:      ui-monospace, "Cascadia Code", "Fira Code", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:       #0d1117;
    --color-surface:  #161b22;
    --color-border:   #30363d;
    --color-primary:  #58a6ff;
    --color-primary-hover: #79b8ff;
    --color-text:     #e6edf3;
    --color-muted:    #8b949e;
    --color-error:    #f85149;
    --color-success:  #3fb950;
    --color-code-bg:  #1c2128;
  }
}

/* ─── Reset / base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

h1 { margin: 0 0 .5rem; font-size: 1.5rem; }
h2 { margin: 0 0 .5rem; font-size: 1.1rem; }
p  { margin: 0 0 .75rem; }

/* ─── Layout ───────────────────────────────────────────────────────────────── */
#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* ─── Loading state ────────────────────────────────────────────────────────── */
.loading-spinner {
  text-align: center;
  padding: 4rem 0;
  color: var(--color-muted);
}

/* ─── Card (used for login) ────────────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.login-card {
  max-width: 380px;
  margin: 6vh auto 0;
}

.login-card h1 {
  text-align: center;
  margin-bottom: 1.5rem;
}

/* ─── Forms ────────────────────────────────────────────────────────────────── */
form { display: flex; flex-direction: column; gap: .75rem; }

label {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text);
}

input[type="text"],
input[type="password"],
textarea {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: .875rem;
  padding: .5rem .75rem;
  transition: border-color .15s;
  width: 100%;
}
input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
  border-color: var(--color-primary);
  outline: 2px solid transparent;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 25%, transparent);
}

textarea { resize: vertical; }

/* ─── Buttons ──────────────────────────────────────────────────────────────── */
button {
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  cursor: pointer;
  font-family: var(--font);
  font-size: .875rem;
  font-weight: 500;
  padding: .5rem 1.25rem;
  transition: background .15s;
}
button:hover  { background: var(--color-primary-hover); }
button:active { opacity: .85; }

button.secondary {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
button.secondary:hover { background: var(--color-code-bg); }

/* ─── Error / status messages ──────────────────────────────────────────────── */
.error-msg {
  color: var(--color-error);
  font-size: .875rem;
  margin: .25rem 0 0;
}
.error-msg[hidden] { display: none; }

/* ─── Site header ──────────────────────────────────────────────────────────── */
.site-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}
.site-header h1 { flex: 1; }
.site-header .user-info { color: var(--color-muted); font-size: .875rem; }

/* ─── Tool list (home page) ────────────────────────────────────────────────── */
.tool-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.tool-list li a {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--color-text);
  padding: 1rem 1.25rem;
  transition: border-color .15s, box-shadow .15s;
}
.tool-list li a:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent);
  text-decoration: none;
}
.tool-list li a strong { display: block; margin-bottom: .25rem; }
.tool-list li a span   { color: var(--color-muted); font-size: .875rem; }

/* ─── Tool runner page ─────────────────────────────────────────────────────── */
.tool-header {
  margin-bottom: 1.5rem;
}
.tool-header .back-link {
  display: inline-block;
  margin-bottom: .5rem;
  font-size: .875rem;
}
.tool-header p { color: var(--color-muted); font-size: .925rem; }

.tool-runner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 1.5rem;
}

.runner-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.runner-panel h2 {
  margin-bottom: 1rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--color-muted);
}

.runner-input-actions {
  display: flex;
  gap: .5rem;
  margin-top: .75rem;
  align-items: center;
}

.history-section {
  grid-column: 1 / -1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

/* ─── Output / code blocks ─────────────────────────────────────────────────── */
pre#tool-output {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: .8rem;
  margin: 0;
  min-height: 4rem;
  overflow: auto;
  padding: .75rem;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ─── History list ─────────────────────────────────────────────────────────── */
.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  max-height: 500px;
  overflow-y: auto;
}

.history-item {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: .8rem;
  padding: .6rem .875rem;
}
.history-item.history-error { border-color: var(--color-error); }

.history-item time {
  color: var(--color-muted);
  display: block;
  margin-bottom: .4rem;
}

.history-item details { margin: .25rem 0; }
.history-item summary {
  color: var(--color-primary);
  cursor: pointer;
  user-select: none;
}
.history-item pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: .78rem;
  margin: .4rem 0 0;
  overflow: auto;
  padding: .5rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.history-item .error-label {
  color: var(--color-error);
  font-weight: 500;
}

/* ─── Empty states ─────────────────────────────────────────────────────────── */
.empty-state {
  color: var(--color-muted);
  font-size: .875rem;
  text-align: center;
  padding: 2rem 0;
}

/* ─── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .tool-runner {
    grid-template-columns: 1fr;
  }
  .history-section {
    grid-column: 1;
  }
  .site-header {
    flex-wrap: wrap;
  }
}