Mail-Graveyard/frontend-js/dist/style.css

/* Outlook 2013 Look — flach, hellblau, Segoe UI, Dreispalter.
   Farben nach dem 2013er Flat-Design: Kopfband Outlook-Blau, helle Panes,
   dezente Rahmen, blaue Auswahlzeile. */
:root {
  --ol-blue:      #0072c6;  /* Outlook-2013 Kopfband */
  --ol-blue-dark: #005a9e;
  --ol-bg:        #f3f3f3;  /* Fensterhintergrund */
  --ol-pane:      #ffffff;
  --ol-tree:      #f0f0f0;  /* linke Spalte etwas grau */
  --ol-border:    #d9d9d9;
  --ol-sel:       #cde6f7;  /* markierte Zeile */
  --ol-sel-bd:    #92c0e0;
  --ol-text:      #262626;
  --ol-muted:     #6b6b6b;
  --ol-unread:    #003399;  /* ungelesen = kraeftiges Blau, fett */
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body.ol2013 {
  font-family: "Segoe UI", "Segoe UI Web", Tahoma, sans-serif;
  font-size: 13px;
  color: var(--ol-text);
  background: var(--ol-bg);
  display: flex;
  flex-direction: column;
}

/* Ribbon / Kopfband */
.ribbon {
  background: var(--ol-blue);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 16px;
  height: 44px;
  flex: 0 0 auto;
}
.ribbon-title { font-weight: 600; font-size: 15px; letter-spacing: .2px; }
.ribbon-tabs { display: flex; gap: 2px; height: 100%; }
.tab {
  display: flex; align-items: center;
  padding: 0 16px; height: 100%;
  color: #eaf3fb; text-decoration: none;
  border-bottom: 3px solid transparent;
}
.tab:hover { background: var(--ol-blue-dark); color: #fff; }
.tab.active { background: #fff; color: var(--ol-blue); border-bottom-color: #fff; }

/* Vier-Spalten-Viewer */
.three-pane,
.four-pane {
  flex: 1 1 auto;
  display: grid;
  min-height: 0;               /* erlaubt Scrollen in den Panes */
}
.three-pane { grid-template-columns: 220px 340px 1fr; }
.four-pane { grid-template-columns: 220px 340px minmax(280px, 1fr) minmax(280px, 1fr); }
.pane {
  border-right: 1px solid var(--ol-border);
  background: var(--ol-pane);
  overflow-y: auto;
  min-height: 0;
}
.pane-tree { background: var(--ol-tree); }
.pane-target { border-right: 0; }
.pane-head {
  position: sticky; top: 0;
  background: #eef3f8;
  border-bottom: 1px solid var(--ol-border);
  padding: 6px 12px;
  font-weight: 600; color: var(--ol-muted);
  text-transform: none;
}

.searchbar {
  position: sticky; top: 30px; z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  padding: 8px;
  background: #fff;
  border-bottom: 1px solid var(--ol-border);
}
.search-input { min-width: 0; }
.search-btn { padding-left: 10px; padding-right: 10px; }

/* Ordnerbaum */
.tree-node { padding: 4px 12px 4px 24px; cursor: pointer; white-space: nowrap; }
a.tree-node { display: block; color: inherit; text-decoration: none; }
.tree-node.account { padding-left: 12px; font-weight: 600; color: var(--ol-blue-dark); }
.tree-node:hover { background: #e5eff8; }
.tree-node.active { background: var(--ol-sel); box-shadow: inset 2px 0 0 var(--ol-blue); }

/* Nachrichtenliste */
.msg-row {
  padding: 8px 12px;
  border-bottom: 1px solid #ececec;
  cursor: pointer;
  display: flex; flex-direction: column; gap: 2px;
}
.msg-row:hover { background: #eef6fd; }
.msg-row.active { background: var(--ol-sel); border-left: 3px solid var(--ol-blue); padding-left: 9px; }
.msg-from { font-weight: 600; }
.msg-subject { color: var(--ol-text); }
.msg-date { color: var(--ol-muted); font-size: 11px; }
.msg-row.unread .msg-from,
.msg-row.unread .msg-subject { color: var(--ol-unread); font-weight: 700; }

/* Lesebereich */
.read-body { padding: 16px 20px; }
.read-head { border-bottom: 1px solid var(--ol-border); padding-bottom: 10px; margin-bottom: 12px; }
.read-subject { font-size: 17px; font-weight: 600; margin: 0 0 6px; }
.read-meta { color: var(--ol-muted); font-size: 12px; }
.read-pre {
  white-space: pre-wrap;
  word-break: break-word;
  font: 12px Consolas, "Courier New", monospace;
  line-height: 1.45;
  margin: 0;
}
.ef-empty { color: var(--ol-muted); padding: 24px; }

/* Buttons / Formulare (flach, 2013er) */
.btn {
  background: var(--ol-blue); color: #fff; border: 0;
  padding: 6px 14px; cursor: pointer; font-size: 13px;
}
.btn:hover { background: var(--ol-blue-dark); }
.btn.secondary { background: #e1e1e1; color: var(--ol-text); border: 1px solid var(--ol-border); }
.btn.secondary:hover { background: #d5d5d5; }
.input, select, textarea {
  border: 1px solid #abadb3; padding: 5px 7px; font: inherit; width: 100%;
  background: #fff;
}
.input:focus { border-color: var(--ol-blue); outline: none; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 16px; }
.label { display: block; font-size: 12px; color: var(--ol-muted); margin-bottom: 3px; }

/* Statusleiste */
.statusbar {
  flex: 0 0 auto;
  background: var(--ol-blue); color: #fff;
  padding: 4px 16px; font-size: 12px;
}
.ok  { color: #107c10; }
.bad { color: #d13438; }

@media (max-width: 1180px) {
  .four-pane {
    grid-template-columns: 200px 320px minmax(300px, 1fr);
  }
  .pane-target {
    grid-column: 3;
    border-top: 1px solid var(--ol-border);
  }
}

@media (max-width: 820px) {
  .four-pane,
  .three-pane {
    grid-template-columns: 1fr;
    overflow-y: auto;
  }
  .pane {
    min-height: 220px;
    border-right: 0;
    border-bottom: 1px solid var(--ol-border);
  }
  .pane-target { grid-column: auto; }
  .searchbar { top: 30px; }
}