:root {
  /* Surface & Backgrounds */
  --portal-bg: #e9efef;
  --portal-card-bg: #2F4F4F;
  --portal-card-text: #FFEBCD;
  --portal-header-bg: #164242;

  /* Text */
  --portal-text-main: #1e293b;
  --portal-text-muted: #475569;
  --portal-text-on-dark: #ffffff;

  /* Tabs */
  --tab-bar-bg: #164242;
  --tab-inactive-bg: #3D7070;
  --tab-inactive-text: #AEDADA;
  --tab-active-bg: #5BA4A4;
  --tab-active-accent: var(--portal-card-text);

  /* Buttons */
  --btn-bg: #5BA4A4;
  --btn-text: #ffffff;
  --btn-hover-bg: #76B9B9;
  --btn-disabled-bg: #2D5A5A;
  --btn-disabled-text: #5BA4A4;

  /* Borders */
  --border-light: #cbd5e1;
  --border-med: #94a3b8;

  /* Surfaces */
  --chip-bg: #e2e8f0;
}

/* ── Base ── */
*, *::before, *::after { box-sizing: border-box; }
body {
  background-color: var(--portal-bg);
  color: var(--portal-text-main);
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
}

/* ── Tab bar ── */
.tab-bar { display: flex; align-items: flex-end; background: var(--tab-bar-bg); border-radius: 8px 8px 0 0; padding: 8px 12px 0 8px; height: 42px; }
.tab-group { display: flex; align-items: flex-end; gap: 4px; flex: 1; }
.tab-bar-title { display: flex; align-items: center; justify-content: flex-start; gap: 8px; padding-bottom: 5px; color: var(--portal-card-text); flex: 1; }
.tab-bar-right { display: flex; align-items: center; gap: 8px; padding-bottom: 5px; flex: 1; justify-content: flex-end; }
.app-title { font-size: 15px; font-weight: 700; color: var(--portal-card-text); }

/* ── Tabs ── */
.tab-btn { padding: 0 20px; height: 32px; background: var(--tab-inactive-bg); border: none; border-radius: 8px 8px 0 0;
           font-size: 12px; font-weight: 700; color: var(--tab-inactive-text); cursor: pointer;
           position: relative; z-index: 1; margin-bottom: -1px;
           text-transform: uppercase; letter-spacing: 0.04em; transition: background 0.1s; }
.tab-btn.active { background: var(--tab-active-bg); color: var(--tab-inactive-text); border-top: 3px solid var(--tab-active-accent); z-index: 3; }
.tab-btn.active::after { content: ''; position: absolute; bottom: -1px; left: 0; right: 0; height: 1px; background: var(--tab-active-bg); }
.tab-btn:hover:not(.active) { background: var(--btn-hover-bg); }

/* ── Buttons ── */
button { padding: 7px 18px; background: var(--btn-bg); color: var(--btn-text); border: none; border-radius: 4px; font-size: 13px; cursor: pointer; font-weight: 700; transition: all 0.15s; white-space: nowrap; }
button:disabled { background: var(--btn-disabled-bg); color: var(--btn-disabled-text); opacity: 0.5; cursor: default; }
button:hover:not(:disabled) { background: var(--btn-hover-bg); transform: translateY(-1px); box-shadow: 0 4px 6px -1px rgba(0,0,0,0.2); }

/* ── Portal link (← Portal chip) ── */
.portal-link { font-size: 11px; font-weight: 700; color: var(--portal-text-muted); background: var(--chip-bg); border: 1px solid var(--border-light); border-radius: 4px; padding: 2px 10px; text-decoration: none; letter-spacing: 0.02em; }
.portal-link:hover { background: var(--portal-text-main); color: var(--portal-text-on-dark); border-color: var(--portal-text-main); }

/* ── Help button ── */
.help-btn { font-size: 11px; padding: 1px 7px; background: var(--tab-inactive-bg); color: var(--tab-inactive-text); border: none; border-radius: 10px; font-weight: 700; cursor: pointer; line-height: 1.6; }
.help-btn:hover { background: var(--btn-hover-bg); color: var(--portal-text-on-dark); }