/* ================================================================
   Digitools — app.css
   No-nonsense design system. Light + dark, system fonts, dense.
   ================================================================ */

/* ----- Design tokens ----- */
:root {
  /* Brand */
  --brand:           #0f172a;
  --brand-strong:    #020617;
  --accent:          #c8202e;
  --accent-strong:   #a01a25;

  /* Surfaces */
  --bg:              #ffffff;
  --bg-soft:         #f8fafc;
  --bg-muted:        #f1f5f9;
  --surface:         #ffffff;
  --border:          #e2e8f0;
  --border-strong:   #cbd5e1;

  /* Text */
  --fg:              #0f172a;
  --fg-soft:         #334155;
  --fg-muted:        #64748b;
  --fg-on-brand:    #f8fafc;

  /* Code */
  --code-bg:         #0f172a;
  --code-fg:         #e2e8f0;
  --code-border:     #1e293b;
  --code-inline-bg:  #f1f5f9;

  /* Status */
  --ok:              #15803d;
  --warn:            #b45309;
  --err:             #b91c1c;

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  /* Layout */
  --radius:          6px;
  --radius-lg:       10px;
  --shadow-sm:       0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow:          0 4px 12px rgba(15, 23, 42, 0.08);

  --container-max:   1100px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:            #0b1220;
    --bg-soft:       #0f172a;
    --bg-muted:      #111827;
    --surface:       #111c2e;
    --border:        #1e293b;
    --border-strong: #334155;

    --fg:            #e2e8f0;
    --fg-soft:       #cbd5e1;
    --fg-muted:      #94a3b8;

    --code-bg:       #020617;
    --code-fg:       #e2e8f0;
    --code-border:   #1e293b;
    --code-inline-bg:#1e293b;

    --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow:        0 4px 12px rgba(0, 0, 0, 0.45);
  }
}

/* ----- Reset-ish ----- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--accent); }
@media (prefers-color-scheme: dark) {
  a { color: #93c5fd; }
  a:hover { color: #fca5a5; }
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 0.5em;
  color: var(--fg);
}
h1 { font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.2rem); }
h2 { font-size: 1.35rem; margin-top: 1.6em; }
h3 { font-size: 1.1rem; margin-top: 1.4em; }

p { margin: 0 0 1em; }

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}
code {
  background: var(--code-inline-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  border: 1px solid var(--code-border);
  margin: 0 0 1em;
}
pre code { background: transparent; padding: 0; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: var(--fg-on-brand);
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1rem;
}

/* ----- Header ----- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  padding: 0.85rem 0;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(8px);
}
.site-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 700;
  font-size: 1.15rem;
}
.site-brand:hover { color: var(--accent); }
.brand-mark { color: var(--accent); font-size: 1.1em; transform: translateY(-1px); }
.brand-name { letter-spacing: -0.01em; }
.brand-tld { color: var(--fg-muted); font-weight: 500; font-size: 0.9em; }

.site-nav ul {
  display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem;
  list-style: none; padding: 0; margin: 0;
  align-items: center;
}
.site-nav a {
  text-decoration: none;
  color: var(--fg-soft);
  font-size: 0.95rem;
  padding: 0.25rem 0.1rem;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--fg); }
.site-nav a.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

@media (max-width: 640px) {
  .site-header .d-flex { flex-direction: column; align-items: flex-start !important; gap: 0.5rem; }
  .site-nav ul { gap: 0.25rem 0.85rem; }
  .site-nav a { font-size: 0.9rem; }
}

/* ----- Breadcrumbs ----- */
.breadcrumb-bar {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0;
  font-size: 0.85rem;
}
.breadcrumb-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 0.25rem;
}
.breadcrumb-list a { color: var(--fg-muted); text-decoration: none; }
.breadcrumb-list a:hover { color: var(--accent); }
.breadcrumb-list [aria-current] { color: var(--fg-soft); font-weight: 500; }
.breadcrumb-list .sep { color: var(--fg-muted); margin: 0 0.25rem; }

/* ----- Tool page ----- */
.tool-page { padding: 1.5rem 0 3rem; }
.tool-header { margin-bottom: 1.25rem; }
.tool-header h1 { margin-bottom: 0.25em; }
.tool-sub { color: var(--fg-muted); margin: 0 0 0.75rem; font-size: 1rem; }
.tool-privacy {
  font-size: 0.85rem;
  color: var(--fg-muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  display: inline-block;
  margin: 0;
}

.tool-widget-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  margin: 1.25rem 0;
}

.tool-explainer {
  margin: 2rem 0;
  max-width: 75ch;
}
.tool-explainer p, .tool-explainer li { color: var(--fg-soft); }
.tool-explainer ul, .tool-explainer ol { padding-left: 1.25rem; }

.tool-faq { margin: 2.5rem 0; }
.tool-faq dl { margin: 0; }
.tool-faq dt {
  font-weight: 600;
  margin-top: 1.25rem;
  color: var(--fg);
}
.tool-faq dd {
  margin: 0.4rem 0 0;
  color: var(--fg-soft);
  max-width: 75ch;
}

.tool-updated { margin-top: 2rem; color: var(--fg-muted); }

/* ----- Forms ----- */
label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
  color: var(--fg-soft);
}
input[type="text"], input[type="email"], input[type="number"], input[type="search"],
input[type="url"], input[type="password"], textarea, select {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.55rem 0.7rem;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, textarea:focus, select:focus {
  outline: 0;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.12);
}
textarea {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  resize: vertical;
  min-height: 120px;
}
.input-mono { font-family: var(--font-mono); font-size: 0.9rem; }

.form-row { display: grid; gap: 1rem; }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 640px) {
  .form-row.cols-2, .form-row.cols-3 { grid-template-columns: 1fr; }
}

.field { margin-bottom: 1rem; }
.field-help { font-size: 0.8rem; color: var(--fg-muted); margin-top: 0.25rem; }

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.4rem 1rem;
}
.checkbox-grid label {
  font-weight: 400;
  display: flex; align-items: center; gap: 0.5rem;
  cursor: pointer;
  margin: 0;
  color: var(--fg);
}
.checkbox-grid input { width: auto; }

/* ----- Buttons ----- */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: inherit; font-size: 0.95rem; font-weight: 600;
  padding: 0.55rem 1rem;
  background: var(--brand);
  color: var(--fg-on-brand);
  border: 1px solid var(--brand);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s, border-color 0.15s;
}
.btn:hover { background: var(--brand-strong); border-color: var(--brand-strong); color: var(--fg-on-brand); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid #93c5fd; outline-offset: 2px; }

.btn-secondary {
  background: var(--bg);
  color: var(--fg);
  border-color: var(--border-strong);
}
.btn-secondary:hover { background: var(--bg-muted); border-color: var(--border-strong); color: var(--fg); }

.btn-accent { background: var(--accent); border-color: var(--accent); }
.btn-accent:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.btn[disabled] { opacity: 0.6; cursor: not-allowed; }

.btn-group { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* ----- Output / result area ----- */
.tool-output {
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  word-break: break-all;
  white-space: pre-wrap;
  min-height: 3rem;
}
.tool-output.empty { color: var(--fg-muted); font-style: italic; }
.tool-output-row {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.tool-output-row .tool-output { flex: 1; margin: 0; }
.tool-output-row .btn { flex-shrink: 0; }

/* ----- Status messages ----- */
.msg {
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  border: 1px solid;
  margin: 0.5rem 0;
}
.msg-ok   { background: #ecfdf5; border-color: #a7f3d0; color: var(--ok); }
.msg-warn { background: #fffbeb; border-color: #fcd34d; color: var(--warn); }
.msg-err  { background: #fef2f2; border-color: #fecaca; color: var(--err); }
@media (prefers-color-scheme: dark) {
  .msg-ok   { background: #052e16; border-color: #14532d; color: #86efac; }
  .msg-warn { background: #422006; border-color: #78350f; color: #fcd34d; }
  .msg-err  { background: #450a0a; border-color: #7f1d1d; color: #fca5a5; }
}

/* ----- Tool grid (home, category, related) ----- */
.tool-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.tool-card {
  display: flex; flex-direction: column; gap: 0.35rem;
  padding: 0.9rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.05s, box-shadow 0.15s;
  height: 100%;
}
.tool-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  color: var(--fg);
}
.tool-card-title { font-weight: 700; color: var(--fg); }
.tool-card-desc  { font-size: 0.85rem; color: var(--fg-muted); }

/* ----- Hero (home) ----- */
.hero {
  padding: 3rem 0 1rem;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle at 20% 0%, rgba(200, 32, 46, 0.05), transparent 50%),
    var(--bg);
}
.hero h1 {
  font-size: clamp(1.8rem, 1.2rem + 2.5vw, 2.6rem);
  margin-bottom: 0.5rem;
}
.hero p {
  font-size: 1.05rem;
  color: var(--fg-soft);
  max-width: 60ch;
}
.hero .lede {
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  margin: 0 0 0.5rem;
}

/* ----- Section heading ----- */
.section { padding: 2rem 0; }
.section-title {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  margin: 0 0 1rem;
}
.section-title h2 { margin: 0; }
.section-title a { font-size: 0.9rem; }

/* ----- Footer ----- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 2.5rem 0 1rem;
  margin-top: 3rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 2rem;
}
@media (max-width: 800px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-heading {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin: 0 0 0.75rem;
}
.footer-links {
  list-style: none; padding: 0; margin: 0;
}
.footer-links li { margin-bottom: 0.35rem; }
.footer-links a {
  text-decoration: none;
  color: var(--fg-soft);
  font-size: 0.9rem;
}
.footer-links a:hover { color: var(--accent); }
.footer-tagline { color: var(--fg); margin: 0.5rem 0 0; font-weight: 500; }
.footer-note { font-size: 0.85rem; color: var(--fg-muted); margin: 0.5rem 0 0; }

.newsletter-form { display: flex; gap: 0.4rem; margin-top: 0.5rem; }
.newsletter-form input { flex: 1; font-size: 0.9rem; }
.newsletter-form button {
  background: var(--brand); color: var(--fg-on-brand);
  border: 1px solid var(--brand); border-radius: var(--radius);
  padding: 0.5rem 0.85rem; cursor: pointer; font-weight: 600;
}
.newsletter-form button:hover { background: var(--brand-strong); }

.footer-bottom {
  margin-top: 2rem; padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  text-align: center;
}

/* ----- Bootstrap-flavored utilities used in markup ----- */
.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.text-muted { color: var(--fg-muted); }
.text-mono { font-family: var(--font-mono); }