/* ===== Design tokens: dark / red glow theme ===== */
:root {
  --paper: #0B0B0D;
  --paper-dim: #161418;
  --paper-raise: #1E1B20;
  --ink: #F4F1EC;
  --ink-soft: #A79E98;
  --line: #302B2E;
  --signal: #FF3B44;
  --signal-soft: #FF6B72;
  --signal-ink: #1F0405;
  --teal: #FF6B72;
  --danger: #FF5A4E;
  --radius: 3px;
  --glow: 0 0 14px rgba(255,59,68,0.45);
  --glow-strong: 0 0 24px rgba(255,59,68,0.75), 0 0 4px rgba(255,107,114,0.9);
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  font-size: 16px;
}

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

img { max-width: 100%; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: 0 1px 0 rgba(255,59,68,0.35);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.brand .brand-mark {
  display: inline-block;
  color: var(--signal);
  flex-shrink: 0;
  filter: drop-shadow(0 0 5px rgba(255,59,68,0.8));
}
.brand:hover .brand-mark { color: var(--signal-soft); }
.brand .tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: var(--radius);
}
nav.main-nav {
  display: flex;
  flex-wrap: wrap;
  row-gap: 6px;
  gap: 18px;
  font-size: 0.9rem;
  justify-content: flex-end;
}
nav.main-nav a { color: var(--ink); }
nav.main-nav a:hover { color: var(--signal-soft); }
.menu-toggle { display: none; }

@media (max-width: 720px) {
  nav.main-nav {
    position: fixed;
    inset: 57px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    display: none;
    border-top: 1px solid var(--line);
    overflow-y: auto;
  }
  nav.main-nav.open { display: flex; }
  nav.main-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    font-size: 1.05rem;
  }
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 34px;
    border: 1.5px solid var(--signal);
    background: none;
    border-radius: var(--radius);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(255,59,68,0.4);
  }
  .menu-toggle span, .menu-toggle span::before, .menu-toggle span::after {
    content: "";
    display: block;
    width: 18px;
    height: 2px;
    background: var(--signal);
    position: relative;
  }
  .menu-toggle span::before { position: absolute; top: -6px; width: 18px; }
  .menu-toggle span::after { position: absolute; top: 6px; width: 18px; }
}

/* ===== Hero / page head ===== */
.page-head {
  border-bottom: 1px solid var(--line);
  padding: 40px 0 32px;
}
.page-head h1 {
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  margin: 0 0 10px;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.page-head p {
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0;
  font-size: 1.05rem;
}
.crumb {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-bottom: 12px;
}
.crumb a { color: var(--ink-soft); }

/* ===== Tool grid on homepage ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 32px 0 56px;
}
.tool-card {
  background: var(--paper-dim);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--ink);
  transition: background .15s ease, box-shadow .15s ease, transform .15s ease;
  position: relative;
}
.tool-card:hover {
  background: var(--paper-raise);
  text-decoration: none;
  box-shadow: inset 0 0 0 1px var(--signal), var(--glow);
  transform: translateY(-2px);
}
.tool-card .num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--signal-ink);
  background: var(--signal);
  align-self: flex-start;
  padding: 1px 7px;
  border-radius: var(--radius);
  box-shadow: 0 0 8px rgba(255,59,68,0.6);
}
.tool-card h3 { margin: 0; font-size: 1.05rem; color: var(--ink); }
.tool-card p { margin: 0; font-size: 0.88rem; color: var(--ink-soft); }

.section-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--signal);
  padding-left: 10px;
  margin: 48px 0 4px;
}

/* ===== Tool workspace ===== */
.workspace {
  border: 1px solid var(--line);
  background: var(--paper-dim);
  border-radius: var(--radius);
  padding: 24px;
  margin: 28px 0;
}
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink);
}
.field .hint { font-size: 0.78rem; color: var(--ink-soft); margin-top: 4px; }

textarea, input[type=text], input[type=number], input[type=date], select {
  width: 100%;
  font-family: var(--sans);
  font-size: 1rem;
  padding: 10px 12px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
}
textarea { min-height: 160px; resize: vertical; font-family: var(--mono); font-size: 0.92rem; }
input:focus, textarea:focus, select:focus, button:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(255,59,68,0.25), var(--glow);
}
input[type=color] {
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}
input[type=range] { accent-color: var(--signal); }

.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 140px; }

button, .btn {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 18px;
  background: var(--signal);
  color: #1A0304;
  border: 1.5px solid var(--signal);
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow: var(--glow);
  transition: box-shadow .2s ease, transform .15s ease, background .2s ease;
  display: inline-block;
}
button:hover, .btn:hover {
  background: var(--signal-soft);
  border-color: var(--signal-soft);
  box-shadow: var(--glow-strong);
  transform: translateY(-1px);
  text-decoration: none;
  color: #1A0304;
}
button.secondary {
  background: transparent;
  color: var(--signal-soft);
  box-shadow: 0 0 8px rgba(255,59,68,0.2);
}
button.secondary:hover {
  background: rgba(255,59,68,0.08);
  color: var(--signal);
  box-shadow: var(--glow);
}

.output {
  margin-top: 18px;
  background: var(--paper);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 16px;
  font-family: var(--mono);
  font-size: 0.95rem;
  word-break: break-word;
  color: var(--ink);
}
.output.big {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--signal-soft);
  text-shadow: 0 0 18px rgba(255,59,68,0.55);
}

.stat-row { display: flex; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 16px; flex-wrap: wrap; }
.stat { flex: 1 1 120px; background: var(--paper-dim); padding: 14px 16px; }
.stat .n { font-family: var(--mono); font-size: 1.4rem; font-weight: 700; color: var(--signal-soft); }
.stat .l { font-size: 0.78rem; color: var(--ink-soft); }

.copy-row { display: flex; gap: 10px; align-items: center; margin-top: 10px; }
.copy-row .msg { font-size: 0.82rem; color: var(--signal-soft); font-family: var(--mono); }

/* ===== Content pages ===== */
.prose { max-width: 74ch; padding: 36px 0 64px; }
.prose h2 { margin-top: 2em; font-size: 1.25rem; color: var(--ink); }
.prose p { color: var(--ink-soft); }
.prose code {
  background: var(--paper-dim);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--signal-soft);
  font-family: var(--mono);
  font-size: 0.9em;
}

.notice {
  border-left: 3px solid var(--signal);
  background: var(--paper-dim);
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--ink-soft);
  border-radius: var(--radius);
  margin-top: 14px;
}
input[type=file] { color: var(--ink); font-size: 0.92rem; }
.file-list { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-soft); margin-top: 8px; }
.progress-wrap { height: 8px; background: var(--paper); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; margin-top: 12px; }
.progress-bar { height: 100%; width: 0%; background: var(--signal); box-shadow: var(--glow); transition: width .2s ease; }

/* ===== Ad slot placeholders ===== */
.ad-slot {
  border: 1px dashed var(--line);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-align: center;
  padding: 10px;
  margin: 32px 0;
  border-radius: var(--radius);
}

/* ===== Footer ===== */
footer.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 60px;
  padding: 32px 0 40px;
  background: var(--paper-dim);
  box-shadow: 0 -1px 0 rgba(255,59,68,0.25);
}
footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
footer .cols { display: flex; gap: 48px; flex-wrap: wrap; }
footer h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); margin: 0 0 10px; }
footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; }
footer a { color: var(--ink-soft); }
footer a:hover { color: var(--signal-soft); }
.foot-note { font-size: 0.8rem; color: var(--ink-soft); margin-top: 24px; }

@media (max-width: 560px) {
  .workspace { padding: 16px; }
  footer .wrap { flex-direction: column; }
}