frontend/src/styles/app-shell.css

/* ─────────────────────────────────────────────────────────────────────
 * app-shell.css — shared chrome for Admin and Analytics pages
 *
 * Both pages get the same brand mark, same nav links, same action
 * buttons, same tab style. Page-specific content lives below in
 * their respective stylesheets.
 *
 * Layout primitives:
 *   .app-page          full-viewport page background
 *   .app-header        sticky top chrome
 *   .app-header-row    one 48px row inside the header
 *   .app-brand         "APE · <page name>" wordmark
 *   .app-brand-dot     thin divider between APE and page name
 *   .app-tabs / .app-tab / .app-tab.active
 *   .app-link          quiet cross-nav link (Chat / Admin / Analytics)
 *   .app-actions       right-aligned button cluster
 *   .btn-text          standard secondary button
 *   .btn-text-emphasis primary-color filled button
 *   .app-main          page content container, max-width 1200px
 * ──────────────────────────────────────────────────────────────────── */

.app-page {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* ── Header ─────────────────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}
.app-header-row {
  display: flex;
  align-items: center;
  padding: 0 24px;
  height: 48px;
  gap: 16px;
}
.app-header-row + .app-header-row {
  border-top: 1px solid var(--border);
  background: var(--bg);
  height: 44px;
  gap: 12px;
}

/* ── Brand mark ─────────────────────────────────────────────────────── */
.app-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--text);
  flex-shrink: 0;
  padding-right: 14px;
  margin-right: 6px;
  border-right: 1px solid var(--border);
  height: 28px;
  line-height: 28px;
}
.app-brand-name {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.app-brand-dot {
  color: var(--border-strong);
  font-weight: 400;
  margin: 0 2px;
}
.app-brand-page {
  color: var(--text);
  font-weight: 500;
}

/* ── Tabs ───────────────────────────────────────────────────────────── */
.app-tabs {
  display: inline-flex;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  border: none;
  height: 48px;              /* match the header row so no stray scrollbar */
  overflow-x: auto;
  overflow-y: hidden;        /* prevent the vertical scrollbar artifact */
  scrollbar-width: none;     /* hide the scrollbar entirely (Firefox) */
  -ms-overflow-style: none;  /* hide (old Edge) */
  flex: 1;
  min-width: 0;
}
.app-tabs::-webkit-scrollbar { display: none; }  /* hide (Chrome/Safari) */
.app-tab {
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  height: 47px;            /* matches header row minus 1px border */
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.12s, border-color 0.12s;
  margin-bottom: -1px;
}
.app-tab:hover  { color: var(--text); }
.app-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* ── Right-side action cluster ──────────────────────────────────────── */
.app-actions {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex-shrink: 0;
}

/* Quiet cross-nav link */
.app-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color 0.12s, background 0.12s;
}
.app-link:hover {
  color: var(--text);
  background: var(--bg);
}

/* Standard action button (text, low weight) */
.btn-text {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 12.5px;
  font-weight: 500;
  font-family: inherit;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
  line-height: 1.2;
}
.btn-text:hover:not(:disabled) {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-text:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn-text-emphasis {
  background: var(--primary);
  color: var(--primary-fg);
  border-color: var(--primary);
}
.btn-text-emphasis:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: var(--primary-fg);
}

/* ── Main content container ─────────────────────────────────────────── */
.app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}

/* ── Responsive: stack tabs below brand on narrow screens ───────────── */
@media (max-width: 900px) {
  .app-header-row {
    flex-wrap: wrap;
    height: auto;
    padding: 8px 16px;
  }
  .app-brand {
    border-right: none;
    margin-right: 0;
    padding-right: 0;
  }
  .app-tabs {
    width: 100%;
    margin-top: 4px;
    border-top: 1px solid var(--border);
    padding-top: 4px;
  }
}

/* ============================================================
   Shared product chrome polish
   ============================================================ */

.app-page {
  background:
    linear-gradient(135deg, rgba(200, 122, 76, 0.06), transparent 36%),
    linear-gradient(315deg, rgba(208, 138, 40, 0.06), transparent 30%),
    var(--bg);
}

.app-header {
  background: rgba(255, 255, 255, 0.82);
  border-bottom-color: rgba(217, 213, 204, 0.74);
  backdrop-filter: blur(14px);
  box-shadow: 0 8px 30px rgba(45, 42, 38, 0.05);
}

.app-header-row {
  min-height: 56px;
  height: auto;
}

.app-header-row + .app-header-row {
  background: rgba(250, 248, 244, 0.78);
  min-height: 48px;
  height: auto;
}

.app-brand {
  height: 34px;
  gap: 9px;
  padding-right: 18px;
}

.app-brand-name {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(145deg, var(--primary), #e0975f);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.04em;
  box-shadow: 0 10px 22px rgba(200, 122, 76, 0.18);
}

.app-brand-page {
  font-size: 14px;
  font-weight: 650;
}

.app-tab {
  height: 56px;
  padding: 0 16px;
  font-size: 13.5px;
  border-bottom-width: 3px;
}

.app-tab.active {
  color: var(--primary);
}

.app-link,
.btn-text {
  min-height: 32px;
  border-radius: var(--radius-md);
}

.btn-text {
  background: rgba(255, 255, 255, 0.66);
  border-color: var(--border);
}

.btn-text-emphasis {
  background: linear-gradient(145deg, var(--primary), #e0975f);
  box-shadow: 0 10px 22px rgba(200, 122, 76, 0.16);
}

.app-main {
  max-width: 1320px;
  padding-top: 30px;
}

/* ============================================================
   Operator UI refresh
   ============================================================ */

.app-page {
  --bg: #f5f7fb;
  --bg-strong: #e8edf5;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-soft: #f8fafc;
  --border: #dbe3ee;
  --border-strong: #b8c4d4;
  --text: #172033;
  --text-secondary: #536173;
  --muted: #788697;
  --primary: #0f766e;
  --primary-hover: #0b5f59;
  --primary-fg: #ffffff;
  --accent-soft: #e7f5f3;
  --accent-warm: #fff3d9;
  --secondary: #eef2f7;
  --secondary-fg: #172033;
  --danger: #c2413c;
  --pos: #228b5e;
  --neg: #c2413c;
  --code-bg: #eef2f7;
  --code-fg: #172033;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(23, 32, 51, 0.06);
  --shadow-md: 0 8px 24px rgba(23, 32, 51, 0.08);
  --shadow-lg: 0 18px 42px rgba(23, 32, 51, 0.12);
  background: #f5f7fb;
}

.app-header {
  background: rgba(255, 255, 255, 0.94);
  border-bottom-color: var(--border);
  box-shadow: 0 1px 0 rgba(23, 32, 51, 0.04), 0 12px 32px rgba(23, 32, 51, 0.06);
}

.app-header-row {
  min-height: 58px;
}

.app-header-row + .app-header-row {
  min-height: 54px;
  background: rgba(248, 250, 252, 0.92);
}

.app-brand {
  border-right-color: var(--border);
}

.app-brand-name {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: #0f766e;
  color: #fff;
  box-shadow: none;
}

.app-brand-page {
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.app-tabs {
  gap: 6px;
  height: auto;
  padding: 8px 0;
}

.app-tab {
  height: 34px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 13px;
}

.app-tab:hover {
  background: #eef2f7;
  color: var(--text);
}

.app-tab.active {
  background: #e7f5f3;
  border-color: #b7ded9;
  color: #0f766e;
  box-shadow: inset 0 0 0 1px rgba(15, 118, 110, 0.05);
}

.app-link,
.btn-text {
  border-radius: 8px;
}

.app-link:hover,
.btn-text:hover:not(:disabled) {
  background: #eef2f7;
}

.btn-text-emphasis {
  background: #0f766e;
  border-color: #0f766e;
  box-shadow: none;
}

.btn-text-emphasis:hover:not(:disabled) {
  background: #0b5f59;
  border-color: #0b5f59;
}

.app-main {
  max-width: 1360px;
  padding: 26px 28px 72px;
}