/* ============================================================
   Presend — shared design tokens & base styles
   Zero external requests: system fonts only, no CDN, no webfonts.
   ============================================================ */

:root {
  /* Color */
  --color-bg: #F7F5F0;
  --color-bg-raised: #FFFFFF;
  --color-ink: #1A1D1B;
  --color-muted: #63665F;
  --color-accent: #1F3A5F;
  --color-accent-ink: #FFFFFF;
  --color-accent-soft: #E7ECF1;
  --color-line: #DDD8CC;
  --color-danger: #8A3324;

  /* Type */
  --font-display: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* Scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --radius: 10px;
  --max-width: 760px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.55;
  font-size: 16px;
}

a { color: var(--color-accent); }
a:focus-visible,
button:focus-visible,
input:focus-visible,
label:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* --- Header --- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-line);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand-mark {
  color: var(--color-accent);
}

.nav-link {
  font-size: 0.95rem;
  color: var(--color-muted);
  text-decoration: none;
}
.nav-link:hover { color: var(--color-ink); }

/* --- Trust badge --- */
.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 0.35em 0.9em;
}
.trust-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

/* --- Hero --- */
.hero {
  padding: var(--space-5) 0 var(--space-4);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: var(--space-2) 0 var(--space-2);
}
.hero p.lede {
  font-size: 1.15rem;
  color: var(--color-muted);
  max-width: 46ch;
}

/* --- How it works diagram --- */
.diagram {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  flex-wrap: wrap;
}
.diagram-step {
  flex: 1 1 140px;
  text-align: center;
  padding: var(--space-2);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}
.diagram-step svg { display: block; margin: 0 auto var(--space-1); }
.diagram-step .label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-muted);
}
.diagram-arrow {
  font-family: var(--font-mono);
  color: var(--color-muted);
  flex: 0 0 auto;
}

/* --- Tool cards --- */
.tool-grid {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-3) 0 var(--space-5);
}
.tool-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}
.tool-card:hover { border-color: var(--color-accent); }
.tool-card h3 {
  margin: 0 0 0.25em;
  font-family: var(--font-display);
  font-size: 1.15rem;
}
.tool-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.92rem;
}
.tool-card .go {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 0.9rem;
  white-space: nowrap;
}
.tool-card.disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* --- Tool page layout --- */
.tool-page main {
  padding: var(--space-4) 0 var(--space-6);
}
.tool-back {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-muted);
  text-decoration: none;
}
.tool-page h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin: var(--space-2) 0 var(--space-1);
}
.tool-page .lede {
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}

.dropzone {
  border: 2px dashed var(--color-line);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-3);
  text-align: center;
  background: var(--color-bg-raised);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.dropzone.dragover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}
.dropzone p { margin: 0.25em 0; }
.dropzone .primary { font-size: 1.05rem; }
.dropzone .secondary { font-size: 0.88rem; color: var(--color-muted); }
.dropzone input[type="file"] { display: none; }

.result {
  margin-top: var(--space-3);
  display: none;
}
.result.visible { display: block; }

.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: var(--space-1);
}
.result-row .filename {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.result-row .meta {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.btn {
  display: inline-block;
  font: inherit;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6em 1.2em;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { opacity: 0.9; }
.btn.ghost {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.error-msg {
  color: var(--color-danger);
  font-size: 0.9rem;
  margin-top: var(--space-1);
  display: none;
}
.error-msg.visible { display: block; }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: var(--space-3) 0 var(--space-4);
  color: var(--color-muted);
  font-size: 0.85rem;
}