.obs-shell .obs-nav-item {
  position: relative;
  display: flex;
  align-items: center;
  padding: var(--obs-space-3) var(--obs-space-5);
  color: var(--obs-text-tertiary);
  font-size: var(--obs-font-size-sm);
  text-transform: uppercase;
  letter-spacing: var(--obs-track-wide);
  font-weight: var(--obs-font-weight-medium);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--obs-dur) var(--obs-ease),
              background var(--obs-dur) var(--obs-ease),
              border-color var(--obs-dur) var(--obs-ease);
}

.obs-shell .obs-nav-item:hover {
  color: var(--obs-text-secondary);
  background: var(--obs-bg-3);
  text-decoration: none;
}

.obs-shell .obs-nav-item[aria-current="page"] {
  color: var(--obs-text-primary);
  border-left-color: var(--obs-accent);
  background: linear-gradient(90deg,
    var(--obs-accent-soft) 0%,
    var(--obs-accent-warm-soft) 25%,
    transparent 80%);
}
.obs-shell .obs-nav-item[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -2px; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(180deg,
    transparent 0%,
    var(--obs-accent) 30%,
    var(--obs-accent) 70%,
    transparent 100%);
  filter: drop-shadow(0 0 4px var(--obs-accent-glow));
}

.obs-shell .obs-theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: var(--obs-radius-sm);
  color: var(--obs-text-tertiary);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.obs-shell .obs-theme-toggle:hover {
  background: var(--obs-bg-3);
  color: var(--obs-text-primary);
}

/* Cards (used by home + not-found) */
.obs-shell .obs-card {
  position: relative;
  background:
    linear-gradient(180deg, rgba(0, 240, 255, 0.02), transparent 30%),
    var(--obs-bg-2);
  border: 1px solid var(--obs-hairline);
  border-radius: var(--obs-radius-md);
  padding: var(--obs-space-6);
  max-width: 640px;
  margin: var(--obs-space-7) auto;
  box-shadow:
    0 0 0 1px var(--obs-hairline-white),
    0 30px 80px rgba(0, 0, 0, 0.35);
}
/* Top border as a centered gradient — fades at the edges */
.obs-shell .obs-card::before {
  content: "";
  position: absolute;
  top: -1px; left: 8%; right: 8%;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--obs-accent) 50%,
    transparent 100%);
  filter: drop-shadow(0 0 6px var(--obs-accent-glow));
}
.obs-shell .obs-card.obs-empty-state {
  text-align: center;
}

.obs-shell .obs-empty-state h1,
.obs-shell .obs-not-found h1 {
  font-family: var(--obs-font-serif);
  font-size: var(--obs-font-size-3xl);
  font-weight: var(--obs-font-weight-medium);
  margin: 0 0 var(--obs-space-4);
  letter-spacing: var(--obs-track-tight);
  line-height: var(--obs-line-height-tight);
  color: var(--obs-text-primary);
}

.obs-shell .obs-empty-state p,
.obs-shell .obs-not-found p {
  margin: 0;
  color: var(--obs-text-tertiary);
  font-size: var(--obs-font-size-base);
  max-width: 48ch;
  margin-left: auto;
  margin-right: auto;
}

/* Eyebrow — small uppercase label above the h1 in empty state */
.obs-shell .obs-empty-state .obs-eyebrow {
  display: block;
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  font-weight: var(--obs-font-weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--obs-track-eyebrow);
  color: var(--obs-accent-warm);
  margin: 0 0 var(--obs-space-3);
}

.obs-shell .obs-not-found {
  max-width: 640px;
  margin: var(--obs-space-7) auto;
}

.obs-shell .obs-build-indicator {
  color: var(--obs-text-disabled);
}

/* Currently-loaded study indicator in the status strip */
.obs-shell .obs-status-study {
  display: inline-flex;
  align-items: center;
  gap: var(--obs-space-2);
  margin-left: var(--obs-space-4);
  color: var(--obs-text-tertiary);
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  letter-spacing: var(--obs-track-wide);
}
.obs-shell .obs-status-study::before {
  content: "·";
  color: var(--obs-text-disabled);
}
.obs-shell .obs-status-study-name {
  color: var(--obs-accent);
  font-weight: var(--obs-font-weight-medium);
}
.obs-shell .obs-status-study-name::before {
  content: "● ";
  color: var(--obs-accent);
}

/* ---------- Auth chip / Sign-In button ---------- */

.obs-shell .obs-account-slot {
  display: inline-flex;
  align-items: center;
  margin-left: var(--obs-space-3);
}

.obs-shell .obs-signin-btn {
  padding: 0 var(--obs-space-4);
  height: 30px;
  border: 1px solid var(--obs-accent);
  border-radius: var(--obs-radius-sm);
  background: transparent;
  color: var(--obs-accent);
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  text-transform: uppercase;
  letter-spacing: var(--obs-track-wide);
  font-weight: var(--obs-font-weight-medium);
  white-space: nowrap;          /* keep "SIGN IN" on one line on narrow screens */
  flex: none;
  cursor: pointer;
  transition: all var(--obs-dur) var(--obs-ease);
}
.obs-shell .obs-signin-btn:hover {
  background: var(--obs-accent);
  color: var(--obs-bg-1);
  box-shadow: 0 0 12px var(--obs-accent-glow);
}

.obs-shell .obs-account {
  display: inline-flex;
  align-items: center;
  gap: var(--obs-space-2);
}

.obs-shell .obs-tier-badge {
  font-family: var(--obs-font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: var(--obs-track-eyebrow);
  padding: 2px var(--obs-space-2);
  border-radius: 999px;
  border: 1px solid var(--obs-hairline);
  color: var(--obs-text-tertiary);
}
.obs-shell .obs-tier-badge--premium {
  color: var(--obs-bg-1);
  background: var(--obs-accent-warm);
  border-color: var(--obs-accent-warm);
  box-shadow: 0 0 8px rgba(199, 154, 82, 0.35);
}
.obs-shell .obs-tier-badge--free {
  color: var(--obs-text-tertiary);
}

.obs-shell .obs-account-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--obs-space-2);
  padding: 2px var(--obs-space-2) 2px 2px;
  border: 1px solid var(--obs-hairline);
  border-radius: 999px;
  background: var(--obs-bg-3);
  color: var(--obs-text-secondary);
  cursor: pointer;
  transition: border-color var(--obs-dur) var(--obs-ease),
              background var(--obs-dur) var(--obs-ease);
}
.obs-shell .obs-account-btn:hover {
  border-color: var(--obs-hairline-strong);
  background: var(--obs-bg-4);
}
.obs-shell .obs-avatar {
  width: 24px; height: 24px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--obs-accent), var(--obs-accent-warm));
  color: var(--obs-bg-1);
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  font-weight: var(--obs-font-weight-bold);
}
.obs-shell .obs-account-email {
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  letter-spacing: var(--obs-track-tight);
  color: var(--obs-text-secondary);
  max-width: 14ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Hide email on narrow screens — keep avatar + tier badge */
@media (max-width: 720px) {
  .obs-shell .obs-account-email { display: none; }
}

/* ---------- Account menu (dropdown) ---------- */

.obs-account-menu {
  position: fixed;
  z-index: 1100;
  min-width: 280px;
  padding: var(--obs-space-3);
  background:
    linear-gradient(180deg, rgba(0, 240, 255, 0.03), transparent 30%),
    var(--obs-bg-2);
  border: 1px solid var(--obs-hairline-strong);
  border-radius: var(--obs-radius-md);
  box-shadow:
    inset 0 0 0 1px var(--obs-hairline-white),
    0 24px 64px rgba(0, 0, 0, 0.55);
  display: flex;
  flex-direction: column;
  gap: var(--obs-space-3);
  animation: obs-dialog-fade-in 160ms var(--obs-ease);
}
.obs-account-menu-head {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: var(--obs-space-2);
  border-bottom: 1px solid var(--obs-hairline-white);
}
.obs-account-menu-head .obs-eyebrow {
  letter-spacing: var(--obs-track-eyebrow);
  color: var(--obs-accent-warm);
}
.obs-account-menu-note {
  margin: 0;
  font-family: var(--obs-font-sans);
  font-size: var(--obs-font-size-xs);
  color: var(--obs-text-tertiary);
  line-height: 1.5;
}
.obs-account-menu-section {
  display: flex;
  flex-direction: column;
  gap: var(--obs-space-2);
}
.obs-account-menu-label {
  font-family: var(--obs-font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: var(--obs-track-eyebrow);
  color: var(--obs-text-tertiary);
}
.obs-account-menu-tiers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--obs-space-2);
}
.obs-account-tier-btn {
  padding: var(--obs-space-2) var(--obs-space-3);
  border: 1px solid var(--obs-hairline);
  border-radius: var(--obs-radius-sm);
  background: var(--obs-bg-3);
  color: var(--obs-text-tertiary);
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  text-transform: uppercase;
  letter-spacing: var(--obs-track-wide);
  cursor: pointer;
  transition: all var(--obs-dur) var(--obs-ease);
}
.obs-account-tier-btn:hover {
  color: var(--obs-text-primary);
  border-color: var(--obs-hairline-strong);
}
.obs-account-tier-btn.is-active {
  color: var(--obs-bg-1);
  background: var(--obs-accent);
  border-color: var(--obs-accent);
}
.obs-account-menu-item {
  padding: var(--obs-space-2) var(--obs-space-3);
  border: 0;
  border-radius: var(--obs-radius-sm);
  background: transparent;
  color: var(--obs-text-secondary);
  font-family: var(--obs-font-sans);
  font-size: var(--obs-font-size-sm);
  text-align: left;
  cursor: pointer;
  transition: background var(--obs-dur) var(--obs-ease),
              color var(--obs-dur) var(--obs-ease);
}
.obs-account-menu-item:hover {
  color: var(--obs-text-primary);
  background: var(--obs-bg-3);
}

/* ---------- Auth modal contents ---------- */

.obs-auth-body {
  margin: 0;
  font-family: var(--obs-font-sans);
  font-size: var(--obs-font-size-sm);
  color: var(--obs-text-secondary);
  line-height: var(--obs-line-height-base);
}
.obs-auth-body--muted {
  color: var(--obs-text-tertiary);
}
.obs-auth-body code {
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  background: var(--obs-bg-3);
  padding: 1px 4px;
  border-radius: 3px;
}
.obs-auth-dev {
  display: flex;
  flex-direction: column;
  gap: var(--obs-space-2);
  padding: var(--obs-space-3);
  border: 1px dashed var(--obs-hairline);
  border-radius: var(--obs-radius-sm);
  background: var(--obs-bg-3);
}
.obs-auth-features {
  margin: 0;
  padding: 0 0 0 var(--obs-space-4);
  font-family: var(--obs-font-sans);
  font-size: var(--obs-font-size-sm);
  color: var(--obs-text-secondary);
  line-height: 1.7;
}
.obs-auth-features li {
  list-style-type: '◇  ';
  list-style-position: outside;
}

/* ---------- Capped Save button (geometry header) ---------- */
.obs-shell .geom-save-btn.is-capped {
  border-color: var(--obs-accent-warm);
  background: var(--obs-accent-warm-soft);
  color: var(--obs-accent-warm);
  font-size: 10px;
}
.obs-shell .geom-save-btn.is-capped:hover {
  background: var(--obs-accent-warm);
  color: var(--obs-bg-1);
  box-shadow: 0 0 12px rgba(199, 154, 82, 0.4);
}

/* ---------- Modal Dialog ---------- */

.obs-dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(4, 5, 6, 0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: grid;
  place-items: center;
  padding: var(--obs-space-5);
  animation: obs-dialog-fade-in 180ms var(--obs-ease);
}
@keyframes obs-dialog-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.obs-dialog {
  position: relative;
  width: 100%;
  max-width: 480px;
  background:
    linear-gradient(180deg, rgba(0, 240, 255, 0.03), transparent 30%),
    var(--obs-bg-2);
  border: 1px solid var(--obs-hairline-strong);
  border-radius: var(--obs-radius-md);
  padding: var(--obs-space-5);
  box-shadow:
    inset 0 0 0 1px var(--obs-hairline-white),
    0 40px 100px rgba(0, 0, 0, 0.6);
  animation: obs-dialog-rise 220ms var(--obs-ease);
}
@keyframes obs-dialog-rise {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.obs-dialog::before {
  content: "";
  position: absolute;
  top: -1px; left: 12%; right: 12%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--obs-accent) 50%, transparent);
  filter: drop-shadow(0 0 6px var(--obs-accent-glow));
}

.obs-dialog-head {
  display: flex;
  flex-direction: column;
  gap: var(--obs-space-1);
  margin-bottom: var(--obs-space-4);
}
.obs-dialog-head .obs-eyebrow {
  letter-spacing: var(--obs-track-eyebrow);
  color: var(--obs-accent-warm);
}
.obs-dialog-head h2 {
  font-family: var(--obs-font-serif);
  font-size: var(--obs-font-size-xl);
  font-weight: var(--obs-font-weight-medium);
  color: var(--obs-text-primary);
  margin: 0;
  letter-spacing: var(--obs-track-tight);
}

.obs-dialog-form {
  display: flex;
  flex-direction: column;
  gap: var(--obs-space-4);
}
.obs-dialog-field {
  display: flex;
  flex-direction: column;
  gap: var(--obs-space-2);
}
.obs-dialog-label {
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  text-transform: uppercase;
  letter-spacing: var(--obs-track-eyebrow);
  color: var(--obs-accent-warm);
}
.obs-dialog-hint {
  color: var(--obs-text-disabled);
  text-transform: none;
  letter-spacing: 0;
  font-size: 10px;
}
.obs-dialog-field input,
.obs-dialog-field textarea {
  width: 100%;
  padding: var(--obs-space-3);
  border: 1px solid var(--obs-hairline);
  border-radius: var(--obs-radius-sm);
  background: var(--obs-bg-3);
  color: var(--obs-text-primary);
  font-family: var(--obs-font-sans);
  font-size: var(--obs-font-size-base);
  outline: none;
  transition: border-color var(--obs-dur) var(--obs-ease),
              box-shadow var(--obs-dur) var(--obs-ease),
              background var(--obs-dur) var(--obs-ease);
  resize: vertical;
}
.obs-dialog-field input:focus,
.obs-dialog-field textarea:focus {
  border-color: var(--obs-hairline-cyan);
  background: var(--obs-bg-4);
  box-shadow: 0 0 0 3px var(--obs-accent-soft);
}

.obs-dialog-foot {
  display: flex;
  justify-content: flex-end;
  gap: var(--obs-space-3);
  margin-top: var(--obs-space-3);
}
.obs-dialog-cancel,
.obs-dialog-submit {
  padding: 0 var(--obs-space-4);
  height: 32px;
  border-radius: var(--obs-radius-sm);
  font-family: var(--obs-font-mono);
  font-size: var(--obs-font-size-xs);
  text-transform: uppercase;
  letter-spacing: var(--obs-track-wide);
  font-weight: var(--obs-font-weight-medium);
  cursor: pointer;
  transition: all var(--obs-dur) var(--obs-ease);
}
.obs-dialog-cancel {
  border: 1px solid var(--obs-hairline);
  background: transparent;
  color: var(--obs-text-tertiary);
}
.obs-dialog-cancel:hover {
  color: var(--obs-text-primary);
  border-color: var(--obs-hairline-strong);
  background: var(--obs-bg-3);
}
.obs-dialog-submit {
  border: 1px solid var(--obs-accent);
  background: var(--obs-accent);
  color: var(--obs-bg-1);
}
.obs-dialog-submit:hover {
  box-shadow: 0 0 12px var(--obs-accent-glow);
}

/* ---------- Home view ---------- */

.obs-shell .obs-home {
  position: relative;
  min-height: 100%;
  padding: var(--obs-space-7) var(--obs-space-5);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.obs-shell .obs-home-watermark {
  position: absolute;
  top: 50%; left: 50%;
  width: 720px;
  height: 720px;
  max-width: 90vmin;
  max-height: 90vmin;
  transform: translate(-50%, -50%);
  color: var(--obs-accent-warm);
  opacity: 0.06;
  pointer-events: none;
  filter: drop-shadow(0 0 32px rgba(199, 154, 82, 0.12));
}
html[data-theme="light"] .obs-shell .obs-home-watermark { opacity: 0.10; }

.obs-shell .obs-home .obs-card {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  max-width: 560px;
}
.obs-shell .obs-home .obs-empty-state h1 {
  font-style: italic;
}

/* ==========================================================================
   Trial pill (topbar) — surfaces the 14-day reverse-trial countdown.
   ========================================================================== */
.obs-shell .obs-trial-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 999px;
  font-family: var(--obs-font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: var(--obs-track-wide);
  cursor: pointer;
  transition: filter var(--obs-dur) var(--obs-ease),
              border-color var(--obs-dur) var(--obs-ease);
  margin-right: var(--obs-space-2);
}
.obs-shell .obs-trial-pill.is-active {
  border: 1px solid var(--obs-violet);
  background: var(--obs-violet-medium);
  color: var(--obs-violet);
  box-shadow: 0 0 8px var(--obs-violet-glow);
}
.obs-shell .obs-trial-pill.is-active:hover { filter: brightness(1.15); }
.obs-shell .obs-trial-pill.is-expired {
  border: 1px solid var(--obs-hairline-strong);
  background: transparent;
  color: var(--obs-text-tertiary);
}
.obs-shell .obs-trial-pill.is-expired:hover {
  color: var(--obs-accent);
  border-color: var(--obs-accent);
}
.obs-shell .obs-trial-pill-label {
  font-weight: var(--obs-font-weight-medium);
}
.obs-shell .obs-trial-pill-days {
  font-variant-numeric: tabular-nums;
  color: inherit;
}