/* =========================================================
   Motor de Trazos — Demo Alpha
   Estilos standalone (sin dependencia del CSS global del sitio)
   ========================================================= */

/* ---- Reset mínimo ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img { max-width: 100%; height: auto; display: block; }
button, a { cursor: pointer; }
[hidden] { display: none !important; }

/* ---- Tokens ---- */
:root {
  --color-bg:         #f7f5f2;
  --color-surface:    #ffffff;
  --color-border:     #e0dbd3;
  --color-border-focus: #3a6b8a;
  --color-ink:        #1a2a35;
  --color-ink-soft:   #4a5c6a;
  --color-ink-muted:  #7a8a96;
  --color-accent:     #1e4b6e;
  --color-accent-dark:#153755;
  --color-error-bg:   #fff3f0;
  --color-error-ink:  #8b2010;
  --color-error-border:#e8a090;
  --color-notice-bg:  #fef8ec;
  --color-notice-ink: #7a5210;
  --color-notice-border:#e8d090;
  --color-preset-active-bg: #e8f1f8;
  --color-preset-active-border: #3a6b8a;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-card: 0 2px 8px rgba(20,40,55,0.07), 0 1px 3px rgba(20,40,55,0.04);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ---- Base ---- */
html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ---- Header ---- */
.tool-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
}
.tool-header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.tool-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.tool-back {
  font-size: 0.875rem;
  color: var(--color-accent);
  text-decoration: none;
}
.tool-back:hover { text-decoration: underline; }

/* ---- Main ---- */
.tool-main {
  flex: 1;
  max-width: 780px;
  margin: 0 auto;
  width: 100%;
  padding: 2rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ---- Intro ---- */
.tool-intro { display: flex; flex-direction: column; gap: 0.5rem; }
.tool-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-preset-active-bg);
  border: 1px solid var(--color-preset-active-border);
  border-radius: 99px;
  padding: 0.2rem 0.7rem;
  width: fit-content;
}
.tool-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.tool-subtitle {
  font-size: 1rem;
  color: var(--color-ink-soft);
  max-width: 56ch;
}
.tool-notice {
  font-size: 0.8125rem;
  background: var(--color-notice-bg);
  border: 1px solid var(--color-notice-border);
  color: var(--color-notice-ink);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.8rem;
  max-width: 56ch;
}

/* ---- Form / Steps ---- */
.tool-form { display: flex; flex-direction: column; gap: 1.75rem; }
.tool-step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.4rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.step-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ---- Upload area ---- */
.upload-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem 1rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  text-align: center;
  position: relative;
}
.upload-area:hover,
.upload-area:focus-within {
  border-color: var(--color-border-focus);
  background: #f0f6fb;
}
.upload-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.upload-icon { color: var(--color-ink-muted); }
.upload-text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink-soft);
}
.upload-hint {
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}

/* ---- Preview original ---- */
.preview-original {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.preview-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.preview-img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  max-height: 260px;
  width: auto;
  object-fit: contain;
  background: var(--color-bg);
}
.preview-meta {
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}

/* ---- Preset options ---- */
.preset-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
}
.preset-option { cursor: pointer; }
.preset-input { position: absolute; opacity: 0; width: 0; height: 0; }
.preset-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 0.9rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
}
.preset-input:checked + .preset-card {
  border-color: var(--color-preset-active-border);
  background: var(--color-preset-active-bg);
}
.preset-option:hover .preset-card {
  border-color: var(--color-border-focus);
}
.preset-input:focus-visible + .preset-card {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.preset-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
}
.preset-desc {
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  line-height: 1.3;
}

/* ---- Buttons ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.15s, opacity 0.15s;
  cursor: pointer;
}
.btn-primary:hover { background: var(--color-accent-dark); }
.btn-primary:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.2rem;
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
  cursor: pointer;
}
.btn-ghost:hover { border-color: var(--color-accent); background: #f0f6fb; }
.btn-sm { font-size: 0.8125rem; padding: 0.4rem 0.8rem; }

/* ---- States ---- */
.state-loading,
.state-error,
.state-result {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.4rem;
  box-shadow: var(--shadow-card);
}

/* Loading */
.state-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}
.state-loading[hidden] { display: none; }
.spinner {
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.state-msg {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink-soft);
}
.state-hint {
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}

/* Error */
.state-error {
  border-color: var(--color-error-border);
  background: var(--color-error-bg);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.state-error[hidden] { display: none; }
.state-error-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-error-ink);
}
.state-error-msg {
  font-size: 0.875rem;
  color: var(--color-error-ink);
  opacity: 0.85;
}

/* Result */
.state-result[hidden] { display: none; }
.result-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}
.result-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.result-col { display: flex; flex-direction: column; gap: 0.4rem; }
.result-col-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink-muted);
}
.result-img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  background: var(--color-bg);
}
.result-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

/* ---- Footer ---- */
.tool-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 0.9rem 1rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}
.tool-footer a {
  color: var(--color-accent);
  text-decoration: none;
}
.tool-footer a:hover { text-decoration: underline; }

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .tool-main { padding: 1.25rem 0.875rem 2.5rem; }
  .tool-step { padding: 1rem 1rem; }
  .preset-row { grid-template-columns: 1fr; }
  .result-compare { grid-template-columns: 1fr; }
  .result-actions { flex-direction: column; align-items: stretch; }
  .btn-primary, .btn-ghost { width: 100%; }
}