/* ── Reset & base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0d1117;
  --bg2:        #161b22;
  --bg3:        #21262d;
  --bg4:        #30363d;
  --border:     #30363d;
  --border2:    #484f58;
  --text:       #e6edf3;
  --text2:      #8b949e;
  --text3:      #6e7681;
  --accent:     #2f81f7;
  --accent2:    #1f6feb;
  --green:      #3fb950;
  --orange:     #d29922;
  --red:        #f85149;
  --purple:     #bc8cff;
  --tab-active: #161b22;
  --nav-h:      48px;
  --legend-h:   40px;
  --font:       -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono:       'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --radius:     6px;
  --trans:      0.15s ease;
}

[data-theme="light"] {
  --bg:         #ffffff;
  --bg2:        #f6f8fa;
  --bg3:        #eaeef2;
  --bg4:        #d0d7de;
  --border:     #d0d7de;
  --border2:    #b3b9c0;
  --text:       #1f2328;
  --text2:      #636c76;
  --text3:      #9198a1;
  --accent:     #0969da;
  --accent2:    #0550ae;
  --green:      #1a7f37;
  --tab-active: #ffffff;
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

/* ── Top Nav ───────────────────────────────────────────────────────────────── */
.topnav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 1rem; gap: 1rem;
  z-index: 100;
}

.nav-brand { display: flex; align-items: center; gap: .5rem; flex-shrink: 0; }
.nav-title { font-weight: 600; font-size: .9rem; color: var(--text); }
.nav-badge {
  font-size: .65rem; font-weight: 600;
  background: var(--accent); color: #fff;
  padding: .1rem .4rem; border-radius: 20px;
  letter-spacing: .04em;
}

.nav-center { display: flex; align-items: center; gap: .5rem; flex: 1; justify-content: center; }
.nav-tag {
  font-size: .7rem; color: var(--text2);
  border: 1px solid var(--border); border-radius: 4px;
  padding: .15rem .5rem;
}

.nav-actions { display: flex; align-items: center; gap: .4rem; flex-shrink: 0; }

.btn-icon {
  width: 32px; height: 32px; border: 1px solid var(--border);
  background: var(--bg3); color: var(--text2);
  border-radius: var(--radius); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--trans);
}
.btn-icon:hover { background: var(--bg4); color: var(--text); }

.btn-export {
  display: flex; align-items: center; gap: .3rem;
  padding: .3rem .65rem; border: 1px solid var(--border);
  background: var(--bg3); color: var(--text2);
  border-radius: var(--radius); cursor: pointer;
  font-size: .78rem; font-weight: 500;
  transition: all var(--trans);
}
.btn-export:hover { background: var(--bg4); color: var(--text); border-color: var(--border2); }
.btn-primary-export {
  background: var(--accent2); color: #fff; border-color: var(--accent);
}
.btn-primary-export:hover { background: var(--accent); color: #fff; }

/* ── App Shell ─────────────────────────────────────────────────────────────── */
.app-shell {
  position: fixed;
  top: var(--nav-h);
  bottom: var(--legend-h);
  left: 0; right: 0;
  display: flex;
}

/* ── Left Panel ─────────────────────────────────────────────────────────────── */
.left-panel {
  width: 42%;
  min-width: 280px;
  max-width: 70%;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border-right: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.panel-header {
  padding: .5rem .75rem;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; gap: .4rem;
  flex-shrink: 0;
}

.panel-title {
  display: flex; align-items: center; gap: .4rem;
  font-size: .8rem; font-weight: 600; color: var(--text2);
  text-transform: uppercase; letter-spacing: .06em;
}

.editor-toolbar {
  display: flex; gap: .5rem;
}

.lang-select {
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: .3rem .5rem; font-size: .82rem; cursor: pointer;
  outline: none;
}
.lang-select:focus { border-color: var(--accent); }

.title-input {
  flex: 1;
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: .3rem .6rem; font-size: .82rem; outline: none;
}
.title-input::placeholder { color: var(--text3); }
.title-input:focus { border-color: var(--accent); }

.editor-wrapper {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.code-editor {
  width: 100%; height: 100%;
  background: var(--bg);
  color: var(--text);
  border: none; outline: none; resize: none;
  padding: 1rem;
  font-family: var(--mono);
  font-size: .85rem;
  line-height: 1.6;
  tab-size: 4;
}
.code-editor::placeholder { color: var(--text3); }

.editor-footer {
  padding: .5rem .75rem;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  gap: .5rem; flex-shrink: 0;
}

.editor-actions { display: flex; gap: .4rem; }

.btn-generate {
  display: flex; align-items: center; gap: .4rem;
  background: var(--accent2); color: #fff;
  border: none; border-radius: var(--radius);
  padding: .4rem .9rem; font-size: .82rem; font-weight: 600;
  cursor: pointer; transition: all var(--trans);
}
.btn-generate:hover { background: var(--accent); }
.btn-generate:active { transform: scale(.97); }

.btn-ghost {
  display: flex; align-items: center; gap: .35rem;
  background: none; color: var(--text2);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: .4rem .7rem; font-size: .78rem; cursor: pointer;
  transition: all var(--trans);
}
.btn-ghost:hover { background: var(--bg3); color: var(--text); border-color: var(--border2); }

.status-bar { font-size: .75rem; color: var(--text3); }

/* Loading overlay */
.loading-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.6);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 1rem; color: var(--text);
  font-size: .9rem; z-index: 10;
}
.loading-overlay.hidden { display: none; }

.spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Error box */
.error-box {
  position: absolute; bottom: 60px; left: 12px; right: 12px;
  background: rgba(248,81,73,.12);
  border: 1px solid var(--red);
  border-radius: var(--radius);
  padding: .6rem .75rem;
  display: flex; align-items: flex-start; gap: .5rem;
  color: var(--red); font-size: .8rem;
  z-index: 10;
}
.error-box.hidden { display: none; }

/* ── Resize Handle ─────────────────────────────────────────────────────────── */
.resize-handle {
  width: 5px;
  background: var(--border);
  cursor: col-resize;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background var(--trans);
}
.resize-handle:hover, .resize-handle.dragging { background: var(--accent); }
.handle-grip {
  width: 3px; height: 24px;
  border-left: 1px solid var(--border2);
  border-right: 1px solid var(--border2);
}

/* ── Right Panel ─────────────────────────────────────────────────────────────── */
.right-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

/* ── Tabs ───────────────────────────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 0 .5rem;
  gap: .1rem;
  flex-shrink: 0;
}

.tab {
  display: flex; align-items: center; gap: .4rem;
  padding: .6rem .85rem;
  background: none; border: none;
  color: var(--text2); font-size: .82rem; font-weight: 500;
  cursor: pointer; position: relative;
  border-bottom: 2px solid transparent;
  transition: color var(--trans);
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
  background: var(--tab-active);
}

.tab-content { display: none; flex-direction: column; flex: 1; overflow: hidden; }
.tab-content.active { display: flex; }

/* ── Output Header ─────────────────────────────────────────────────────────── */
.output-header {
  padding: .5rem .75rem;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-shrink: 0;
}

.output-info strong { font-size: .82rem; color: var(--text); }
.output-info span { font-size: .75rem; color: var(--text3); margin-left: .5rem; }

.output-actions { display: flex; align-items: center; gap: .35rem; flex-shrink: 0; }

.btn-sm {
  padding: .25rem .6rem;
  background: var(--bg3); color: var(--text2);
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: .75rem; cursor: pointer; transition: all var(--trans);
  text-decoration: none; display: inline-flex; align-items: center;
}
.btn-sm:hover { background: var(--bg4); color: var(--text); border-color: var(--border2); }
.btn-sm-primary { background: var(--accent2); color: #fff; border-color: var(--accent); }
.btn-sm-primary:hover { background: var(--accent); color: #fff; }

.btn-icon-sm {
  width: 26px; height: 26px;
  background: var(--bg3); color: var(--text2);
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: .9rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--trans);
}
.btn-icon-sm:hover { background: var(--bg4); color: var(--text); }

.zoom-label {
  font-size: .75rem; color: var(--text3);
  min-width: 36px; text-align: right;
}

/* ── Diagram Viewport (PAP) ────────────────────────────────────────────────── */
.diagram-viewport {
  flex: 1; overflow: hidden; position: relative;
  background: var(--bg);
  cursor: grab;
}
.diagram-viewport:active { cursor: grabbing; }

.pap-render {
  transform-origin: 0 0;
  display: inline-block;
  min-width: 100%;
  min-height: 100%;
}

/* ── Struktogramm viewport ─────────────────────────────────────────────────── */
.structogram-frame {
  flex: 1;
  overflow: auto;
  padding: 1.5rem;
  background: var(--bg);
}

/* ── Code output ───────────────────────────────────────────────────────────── */
.code-output-wrapper {
  flex: 1; overflow: auto;
  background: var(--bg);
}

.code-output {
  padding: 1rem 1.25rem;
  font-family: var(--mono);
  font-size: .82rem;
  line-height: 1.7;
  color: var(--text2);
  white-space: pre;
  background: transparent;
  min-height: 100%;
}

/* ── Empty state ───────────────────────────────────────────────────────────── */
.empty-state {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: 300px; gap: 1rem;
  color: var(--text3); text-align: center; padding: 2rem;
}
.empty-state p { font-size: .85rem; }
.empty-state strong { color: var(--text2); }

/* ── Legend Bar ─────────────────────────────────────────────────────────────── */
.legend-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  z-index: 100;
}

.legend-toggle {
  width: 100%; height: var(--legend-h);
  background: none; border: none;
  color: var(--text2); font-size: .78rem; font-weight: 500;
  cursor: pointer; display: flex; align-items: center;
  gap: .4rem; padding: 0 1rem;
  transition: color var(--trans);
}
.legend-toggle:hover { color: var(--text); background: var(--bg3); }

.legend-content {
  padding: .75rem 1rem;
  border-top: 1px solid var(--border);
}
.legend-content.hidden { display: none; }

.legend-items {
  display: flex; flex-wrap: wrap; gap: 1rem; align-items: center;
}

.legend-item {
  display: flex; flex-direction: column; align-items: center; gap: .25rem;
}
.legend-item span { font-size: .7rem; color: var(--text3); }

/* ── Struktogramm Styles ─────────────────────────────────────────────────────  */
.sk-root { font-family: var(--font); font-size: 13px; max-width: 100%; }
.sk-title {
  background: var(--bg3); color: var(--text);
  padding: 8px 14px; font-weight: 700; font-size: 13px;
  border: 1.5px solid var(--border2); border-bottom: none;
}
.sk-outer {
  width: 100%; border-collapse: collapse;
  border: 1.5px solid var(--border2);
}
.sk-tbl { width: 100%; border-collapse: collapse; }
.sk-outer td, .sk-tbl td { border: 1px solid var(--border2); }

.c-seq  { padding: 8px 12px; background: var(--bg); color: var(--text); }
.c-in   { padding: 8px 12px; background: rgba(47,129,247,.1); color: var(--text); }
.c-out  { padding: 8px 12px; background: rgba(210,153,34,.1); color: var(--text); }
.c-ret  { padding: 8px 12px; background: rgba(63,185,80,.1); color: var(--text); }
.c-brk  { padding: 8px 12px; background: rgba(248,81,73,.08); color: var(--red); }
.c-func { padding: 8px 12px; background: rgba(188,140,255,.1); color: var(--text); font-weight: 600; }
.c-fbody { padding: 0 0 0 14px; background: var(--bg2); }
.c-empty { padding: 8px 12px; color: var(--text3); font-style: italic; text-align: center; }

.c-loop { padding: 0; background: var(--bg); }
.c-lcond {
  background: rgba(47,129,247,.12); padding: 7px 12px;
  font-weight: bold; border-bottom: 1px solid var(--border2); color: var(--text);
}

.c-vhdr { padding: 0; }
.sk-xhdr {
  position: relative; padding: 8px 12px;
  background: rgba(210,153,34,.1);
  border-bottom: 1px solid var(--border2);
}
.sk-xcond { font-weight: 600; color: var(--text); font-size: 12px; }
.sk-xlabels {
  display: flex; justify-content: space-between;
  font-size: 11px; margin-top: 4px;
}
.sk-wahr  { color: var(--green); font-weight: 700; }
.sk-falsch { color: var(--red); font-weight: 700; }
.c-yes, .c-no { width: 50%; vertical-align: top; }
.c-try  { padding: 0; background: var(--bg); }
.c-trylbl   { background: rgba(188,140,255,.12); padding: 7px 12px; font-weight: bold; border-bottom: 1px solid var(--border2); color: var(--text); }
.c-catchlbl { background: rgba(248,81,73,.1); padding: 7px 12px; font-weight: bold; border-bottom: 1px solid var(--border2); color: var(--red); }

/* ── Scrollbar ──────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg4); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border2); }

/* ── Transitions ────────────────────────────────────────────────────────────── */
body, .topnav, .left-panel, .right-panel, .tab-bar, .panel-header,
.editor-footer, .output-header, .code-output, .structogram-frame,
.legend-bar { transition: background var(--trans), color var(--trans), border-color var(--trans); }

/* ── Toast notification ─────────────────────────────────────────────────────── */
#toast {
  position: fixed; bottom: 60px; right: 1rem;
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: .5rem 1rem; font-size: .8rem;
  z-index: 1000; opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
#toast.show { opacity: 1; }

/* ── Mobile ─────────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  html, body { overflow: auto; }
  .app-shell {
    position: static;
    flex-direction: column;
    height: auto;
  }
  .left-panel {
    width: 100% !important;
    max-width: 100%;
    min-height: 300px;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .editor-wrapper { height: 250px; }
  .right-panel { min-height: 400px; }
  .resize-handle { display: none; }
  .nav-center { display: none; }
  .legend-bar { position: static; }
  .tab-content.active { min-height: 400px; }
  .diagram-viewport { height: 400px; }
}