/*
  Markdown Editor Theme
  Referência visual extraída dos documentos de trabalho mais comuns:
  - Roboto como fonte principal desejada
  - roxo institucional profundo (#39054c)
  - roxo de destaque (#801d87 / #8b39aa)
  - cinzas editoriais (#282828 / #666666)
  - espaçamento amplo, hierarquia documental e superfície limpa
*/

:root {
  color-scheme: light;

  --font-sans: "Roboto", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "Roboto Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --color-a12-ink: #282828;
  --color-a12-muted: #666666;
  --color-a12-soft: #8a7d91;
  --color-a12-purple: #39054c;
  --color-a12-magenta: #801d87;
  --color-a12-violet: #8b39aa;
  --color-a12-violet-soft: #f7f1fa;
  --color-a12-violet-line: #e7d7ee;
  --color-a12-paper: #ffffff;
  --color-a12-canvas: #f6f3f7;
  --color-a12-panel: #fffdfd;
  --color-a12-border: #e7e0ea;
  --color-a12-border-strong: #d4c4da;
  --color-a12-focus: #8b39aa;
  --color-a12-success: #2f7d4f;
  --color-a12-warning: #9c6b00;

  --shadow-panel: 0 0.75rem 2rem rgba(57, 5, 76, 0.08);
  --shadow-toolbar: 0 0.25rem 1.25rem rgba(57, 5, 76, 0.10);

  --radius-sm: 0.45rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;

  --header-min-height: 4rem;
  --pane-title-height: 2.5rem;
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--color-a12-ink);
  background:
    radial-gradient(circle at top left, rgba(139, 57, 170, 0.10), transparent 24rem),
    linear-gradient(180deg, #ffffff 0%, var(--color-a12-canvas) 100%);
  font-family: var(--font-sans);
  font-size: clamp(0.94rem, 0.9rem + 0.18vw, 1rem);
  line-height: 1.55;
  display: flex;
  flex-direction: column;
}

button,
input,
textarea {
  font: inherit;
}

button {
  min-height: 2.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.9rem;
  color: var(--color-a12-paper);
  background: var(--color-a12-purple);
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease, border-color 120ms ease;
}

button:hover {
  background: var(--color-a12-magenta);
  box-shadow: 0 0.35rem 0.8rem rgba(57, 5, 76, 0.18);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
  box-shadow: none;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(139, 57, 170, 0.34);
  outline-offset: 2px;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: var(--header-min-height);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-a12-border);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-toolbar);
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  flex-wrap: wrap;
}

.form-field {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.form-label {
  color: var(--color-a12-purple);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

header input[type="text"] {
  min-height: 2.75rem;
  border: 1px solid var(--color-a12-border-strong);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  color: var(--color-a12-ink);
  background: var(--color-a12-paper);
}

header input[type="text"]::placeholder {
  color: var(--color-a12-soft);
}

header input[disabled] {
  color: var(--color-a12-muted);
  background: var(--color-a12-violet-soft);
  cursor: not-allowed;
}

#titleInput {
  width: min(22rem, 34vw);
}

#fileName {
  width: min(30rem, 40vw);
}

main {
  flex: 1;
  min-height: 0;
  width: min(100%, 96rem);
  margin: 0 auto;
  padding: var(--space-5);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-5);
}

.pane {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--color-a12-border);
  border-radius: var(--radius-lg);
  background: var(--color-a12-panel);
  box-shadow: var(--shadow-panel);
  display: flex;
  flex-direction: column;
}

.pane-title {
  min-height: var(--pane-title-height);
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--color-a12-border);
  color: var(--color-a12-purple);
  background: linear-gradient(90deg, var(--color-a12-violet-soft), #ffffff);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

textarea {
  flex: 1;
  width: 100%;
  min-height: 28rem;
  border: 0;
  resize: none;
  padding: var(--space-5);
  color: var(--color-a12-ink);
  background: #fffefe;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.65;
  outline: none;
}

textarea::placeholder {
  color: var(--color-a12-soft);
}

#status {
  min-height: 2rem;
  border-top: 1px solid var(--color-a12-border);
  padding: 0.35rem 1rem 0.5rem;
  color: var(--color-a12-muted);
  background: #fbf8fc;
  font-size: 0.78rem;
}

#preview {
  flex: 1;
  overflow: auto;
  padding: clamp(1.25rem, 2vw, 2rem);
  color: var(--color-a12-ink);
  background: var(--color-a12-paper);
}

#preview > *:first-child {
  margin-top: 0;
}

#preview > *:last-child {
  margin-bottom: 0;
}

#preview h1,
#preview h2,
#preview h3,
#preview h4,
#preview h5,
#preview h6 {
  line-height: 1.18;
  color: var(--color-a12-purple);
  font-weight: 900;
  letter-spacing: -0.02em;
}

#preview h1 {
  margin: 0 0 1rem;
  color: var(--color-a12-magenta);
  font-size: clamp(2rem, 1.45rem + 2vw, 3.5rem);
}

#preview h2 {
  margin: 2.25rem 0 0.8rem;
  font-size: clamp(1.55rem, 1.25rem + 0.9vw, 2.25rem);
}

#preview h3 {
  margin: 1.75rem 0 0.65rem;
  color: var(--color-a12-violet);
  font-size: clamp(1.25rem, 1.12rem + 0.45vw, 1.65rem);
}

#preview h4 {
  margin: 1.5rem 0 0.5rem;
  color: var(--color-a12-muted);
  font-size: 1.08rem;
}

#preview p,
#preview ul,
#preview ol,
#preview blockquote,
#preview table,
#preview pre {
  margin-top: 0;
  margin-bottom: 1rem;
}

#preview p {
  max-width: 72ch;
}

#preview a {
  color: var(--color-a12-magenta);
  font-weight: 700;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

#preview a:hover {
  color: var(--color-a12-purple);
}

#preview strong {
  color: var(--color-a12-purple);
}

#preview blockquote {
  max-width: 74ch;
  border-left: 0.35rem solid var(--color-a12-violet);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 0.75rem 1rem;
  color: var(--color-a12-muted);
  background: var(--color-a12-violet-soft);
}

#preview ul,
#preview ol {
  padding-left: 1.35rem;
}

#preview li + li {
  margin-top: 0.35rem;
}

#preview code {
  border-radius: 0.35rem;
  padding: 0.12rem 0.32rem;
  color: var(--color-a12-purple);
  background: var(--color-a12-violet-soft);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

#preview pre {
  overflow: auto;
  border: 1px solid var(--color-a12-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  background: #fbf8fc;
}

#preview pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}

#preview table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--color-a12-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
}

#preview th,
#preview td {
  border-bottom: 1px solid var(--color-a12-border);
  padding: 0.65rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

#preview th {
  color: var(--color-a12-paper);
  background: var(--color-a12-purple);
  font-weight: 800;
}

#preview tr:nth-child(even) td {
  background: #fbf8fc;
}

#preview img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

/* Cheat sheet lateral */
.pane-cheats {
  grid-column: 1 / -1;
  display: none;
  max-height: min(34rem, 55vh);
  background: #fbf8fc;
}

body.show-cheats .pane-cheats {
  display: flex;
}

.cheat-content {
  flex: 1;
  margin: 0;
  overflow: auto;
  padding: var(--space-5);
  white-space: pre-wrap;
  color: var(--color-a12-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
}

/* Scrollbars: discreto, sem depender de biblioteca */
textarea,
#preview,
.cheat-content {
  scrollbar-color: var(--color-a12-border-strong) transparent;
  scrollbar-width: thin;
}

@media (max-width: 980px) {
  main {
    grid-template-columns: 1fr;
    padding: var(--space-4);
  }

  textarea {
    min-height: 18rem;
  }

  #preview {
    min-height: 22rem;
  }
}

@media (max-width: 760px) {
  header {
    position: static;
    padding: var(--space-3);
    align-items: stretch;
  }

  .toolbar-group,
  .form-field {
    width: 100%;
  }

  .toolbar-group button {
    flex: 1;
  }

  .form-field {
    align-items: flex-start;
    flex-direction: column;
  }

  #titleInput,
  #fileName {
    width: 100%;
  }

  main {
    padding: var(--space-3);
    gap: var(--space-3);
  }

  .pane-title {
    min-height: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    transition-duration: 0.01ms;
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
  }
}