/* ============================================================
   DiffChecker – style.css
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0f1117;
  --surface:     #1a1d27;
  --surface2:    #22263a;
  --border:      #2e3350;
  --text:        #e2e8f0;
  --text-muted:  #8892a4;
  --accent:      #4f7ef7;
  --green:       #22c55e;
  --green-bg:    #0d2b1a;
  --green-num:   #0a2016;
  --red:         #f87171;
  --red-bg:      #2b0d0d;
  --red-num:     #200a0a;
  --yellow:      #fbbf24;
  --yellow-bg:   #2b2000;
  --yellow-num:  #201800;
  --radius:      10px;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Consolas', 'Menlo', monospace;
  --font-ui:     -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  min-height: 100vh;
  line-height: 1.5;
}

/* ---------- Header ---------- */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 32px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-icon {
  width: 32px; height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.logo-text { font-size: 18px; font-weight: 700; color: var(--text); letter-spacing: -0.3px; }
.logo-sub  { font-size: 12px; color: var(--text-muted); font-weight: 400; }

.header-hint {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 20px;
}
kbd {
  background: var(--border);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ---------- Hauptbereich ---------- */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* ---------- Input-Bereich ---------- */
.input-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.input-panel { display: flex; flex-direction: column; gap: 8px; }

.panel-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}
.panel-label.original { color: var(--red); }
.panel-label.modified { color: var(--green); }

textarea {
  width: 100%;
  height: 240px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 14px 16px;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 126, 247, 0.15);
}
textarea::placeholder { color: var(--text-muted); }

/* ---------- Button-Leiste ---------- */
.action-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn-primary  { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #3b68e0; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79,126,247,0.4); }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-ghost    { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--text-muted); }

/* ---------- Stats-Bar ---------- */
#stats-bar {
  display: none;
  align-items: center;
  gap: 20px;
  margin-bottom: 16px;
  padding: 12px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  flex-wrap: wrap;
}
#stat-additions     { color: var(--green); }
#stat-deletions     { color: var(--red); }
#stat-modifications { color: var(--yellow); }
.stat-divider { width: 1px; height: 16px; background: var(--border); }

/* ---------- Fehlerbox ---------- */
#error-box {
  display: none;
  background: #2b0d0d;
  border: 1px solid #7f1d1d;
  color: var(--red);
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  margin-bottom: 16px;
}

/* ---------- Ergebnis-Bereich ---------- */
#result-section { display: none; }

/* ---------- Diff Container ---------- */
.diff-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}
.diff-panel {
  background: var(--surface);
  min-width: 0;
  overflow: hidden;
}
.diff-panel + .diff-panel {
  border-left: 1px solid var(--border);
}

/* ---------- Panel-Header mit Copy-Button ---------- */
.diff-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-muted);
  position: sticky;
  top: 0;
  z-index: 1;
}
.diff-panel-header.original { color: var(--red); }
.diff-panel-header.modified { color: var(--green); }

.copy-btn {
  font-size: 0.75rem;
  padding: 2px 10px;
  border: 1px solid currentColor;
  border-radius: 4px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.copy-btn:hover  { opacity: 1; }
.copy-btn.copied { opacity: 1; font-weight: bold; }

/* ---------- Diff-Innenstruktur ----------
   .diff-inner ist ein Block-Container.
   Jede Zeile ist eine .diff-row (Flex-Zeile):
     [.line-number | .code-line]
   Da beide im selben Flex-Container sitzen, wächst die Zeilennummer
   automatisch mit, wenn der Code umbricht – Nummern bleiben immer
   korrekt ausgerichtet.
   ------------------------------------------------------------------ */
.diff-inner {
  display: block;
  width: 100%;
}

/* Eine Zeile = Nummer + Code nebeneinander */
.diff-row {
  display: flex;
  align-items: stretch;   /* Nummer dehnt sich auf Höhe der Code-Zeile */
  min-height: 22px;
}

/* Zeilennummer */
.line-number {
  width: 44px;
  min-width: 44px;
  flex-shrink: 0;
  padding: 0 8px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.6;
  text-align: right;
  user-select: none;
  border-right: 1px solid var(--border);
  /* Nummer oben ausrichten, damit sie bei Umbruch oben bleibt */
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding-top: 1px;
}

/* Code-Zeile */
.code-line {
  flex: 1;
  min-width: 0;
  padding: 0 14px;
  line-height: 1.6;
  /*
    pre-wrap: Leerzeichen bleiben erhalten, lange Zeilen brechen um.
    break-all: Umbricht auch ohne Leerzeichen (z. B. lange URLs, Hashes).
  */
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---------- Diff-Farben (Code-Zeile) ---------- */
.code-line.line-equal  { background: transparent; }
.code-line.line-insert { background: var(--green-bg); }
.code-line.line-delete { background: var(--red-bg); }
.code-line.line-modify { background: var(--yellow-bg); }
.code-line.line-empty  { background: var(--surface2); }

/* ---------- Diff-Farben (Zeilennummer) ---------- */
.line-number.line-equal  { background: transparent; }
.line-number.line-insert { background: var(--green-num); color: var(--green); }
.line-number.line-delete { background: var(--red-num);   color: var(--red); }
.line-number.line-modify { background: var(--yellow-num);color: var(--yellow); }
.line-number.line-empty  { background: var(--surface2); }

/* ---------- Zeichen-Diff-Markierungen ---------- */
.char-ins {
  background: rgba(34, 197, 94, 0.35);
  border-radius: 2px;
  color: #bbf7d0;
}
.char-del {
  background: rgba(248, 113, 113, 0.35);
  border-radius: 2px;
  color: #fecaca;
  text-decoration: line-through;
}

/* ---------- Legende ---------- */
.legend {
  display: flex;
  gap: 20px;
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.legend-item { display: flex; align-items: center; gap: 6px; }
.legend-dot  { width: 12px; height: 12px; border-radius: 3px; }
.dot-insert { background: var(--green-bg); border: 1px solid var(--green); }
.dot-delete { background: var(--red-bg);   border: 1px solid var(--red); }
.dot-modify { background: var(--yellow-bg);border: 1px solid var(--yellow); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .input-section  { grid-template-columns: 1fr; }
  .diff-container { grid-template-columns: 1fr; }
  .diff-panel + .diff-panel { border-left: none; border-top: 1px solid var(--border); }
  header { padding: 12px 16px; }
  main   { padding: 20px 12px; }
}