/* BioDosier's public design foundation. Shared primitives are prefixed so the
   research desk can adopt them deliberately, one surface at a time. */
:root {
  --bd-paper: #f5f3ec;
  --bd-ink: #192f27;
  --bd-muted: #5d685f;
  --bd-forest: #234e3b;
  --bd-forest-hover: #163a2a;
  --bd-line: #d7dbd0;
  --bd-sage: #d6e5b7;
  --bd-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --bd-radius: 12px;
  --bd-motion: 180ms;
  --bd-ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

body.is-signed-out {
  color-scheme: light;
  --bg: var(--bd-paper);
  --ink: var(--bd-ink);
  --muted: var(--bd-muted);
  --faint: var(--bd-muted);
  --border: var(--bd-line);
  --primary: var(--bd-forest);
  --primary-strong: var(--bd-forest-hover);
  --on-primary: var(--bd-paper);
  --focus-ring: var(--bd-forest);
  --danger: #a53236;
  background: var(--bd-paper);
  color: var(--bd-ink);
}

body.is-signed-out .shell-inner {
  max-width: 1248px;
  padding-inline: 40px;
}

body.is-signed-out .site-header {
  position: relative;
  background: var(--bd-paper);
  border-bottom: 0;
}

body.is-signed-out .header-row {
  display: flex;
  min-height: 104px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--bd-line);
}

body.is-signed-out .header-meta {
  display: flex;
}

body.is-signed-out .brand-name {
  font-size: 1.375rem;
  font-weight: 650;
  letter-spacing: -0.055em;
}

body.is-signed-out .brand-tag,
body.is-signed-out #version-stamp,
body.is-signed-out .site-footer {
  display: none;
}

body.is-signed-out #signin-btn {
  min-height: 44px;
  padding-inline: 16px;
  color: var(--bd-ink);
  background: transparent;
  border-color: var(--bd-line);
  border-radius: 6px;
  font-size: 0.8125rem;
}

body.is-signed-out #signin-btn:hover {
  color: var(--bd-forest);
  border-color: var(--bd-forest);
  background: #e9ece1;
}

body.is-signed-out .site-main {
  padding-block: 0;
}

/* The public introduction is already useful while the session is resolving. */
body.is-signed-out.is-loading .main-ready,
body.is-signed-out.is-loading .auth-ready {
  opacity: 1;
  pointer-events: auto;
}

body.is-signed-out .session-status[data-state="loading"] {
  display: none;
}

body.is-signed-out .session-status[data-state="error"] {
  margin-block: 20px 0;
}

.gate {
  padding-top: clamp(48px, 6vw, 84px);
}

.gate-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(40px, 6vw, 88px);
}

.gate-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 24px;
  color: var(--bd-forest);
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.gate-eyebrow > span {
  width: 6px;
  height: 6px;
  background: var(--bd-forest);
  border-radius: 50%;
}

.gate h1 {
  margin: 0;
  font-family: var(--bd-serif);
  font-size: clamp(3.25rem, 5.75vw, 5.125rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 1.07;
}

.gate h1 em {
  color: var(--bd-forest);
  font-weight: 400;
}

.gate-lede {
  margin: 28px 0 16px;
  font-size: clamp(1.0625rem, 1.45vw, 1.1875rem);
  line-height: 1.6;
  letter-spacing: -0.015em;
}

.gate-description {
  max-width: 48ch;
  margin: 0;
  color: var(--bd-muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.gate-access {
  margin-top: 28px;
}

.gate-signin {
  min-height: 56px;
  padding: 14px 20px;
  gap: 12px;
  background: var(--bd-forest);
  color: var(--bd-paper);
  border-color: var(--bd-forest);
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 550;
  box-shadow: 0 4px 12px #192f2710;
  transition: background-color var(--bd-motion) var(--bd-ease),
    box-shadow var(--bd-motion) var(--bd-ease);
}

.gate-signin:hover {
  background: var(--bd-forest-hover);
  border-color: var(--bd-forest-hover);
  box-shadow: 0 6px 16px #192f2724;
}

.gate-google {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.gate-arrow {
  margin-left: 16px;
  font-size: 1.125rem;
  transition: transform var(--bd-motion) var(--bd-ease);
}

.gate-signin:hover .gate-arrow {
  transform: translate(2px, -2px);
}

.gate-access > p {
  margin: 12px 0 0;
  color: var(--bd-muted);
  font-size: 0.75rem;
  line-height: 1.6;
}

.research-preview {
  min-width: 0;
  padding: 28px 32px 24px;
  color: var(--bd-paper);
  background: var(--bd-ink);
  border: 1px solid #29473a;
  border-radius: var(--bd-radius);
  box-shadow: 0 20px 50px -28px #192f274d;
}

.research-preview-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 24px;
}

.research-preview-header > p {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
}

.research-tabs {
  display: flex;
  padding: 4px;
  gap: 4px;
  border: 1px solid #47604e;
  border-radius: 7px;
}

.research-tabs[hidden] {
  display: flex !important;
  visibility: hidden;
}

.research-tabs button {
  flex: 1;
  min-width: 0;
  min-height: 44px;
  padding: 8px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: #c5d0c0;
  font: inherit;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: background-color var(--bd-motion) var(--bd-ease),
    color var(--bd-motion) var(--bd-ease);
}

.research-tabs button:hover {
  color: var(--bd-paper);
  background: #2f493b;
}

.research-tabs button[aria-selected="true"] {
  color: var(--bd-ink);
  background: var(--bd-sage);
  font-weight: 600;
}

.research-preview :focus-visible {
  outline-color: var(--bd-sage);
}

/* Overlapping grid cells reserve the tallest panel, preventing tab-induced jumps. */
.research-panels {
  display: grid;
}

.research-panel {
  grid-area: 1 / 1;
  min-width: 0;
  padding-top: 28px;
}

.research-panel[hidden] {
  display: block !important;
  visibility: hidden;
  pointer-events: none;
}

.research-panel-label {
  margin: 0 0 14px;
  color: #b6c6ad;
  font-size: 0.6875rem;
  font-weight: 550;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.research-panel h2 {
  margin: 0;
  color: var(--bd-paper);
  font-family: var(--bd-serif);
  font-size: clamp(2rem, 3vw, 2.625rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.13;
}

.research-panel h2 em {
  color: var(--bd-sage);
}

.research-questions {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.research-questions li {
  position: relative;
  padding: 12px 0 12px 20px;
  border-top: 1px solid #3b5143;
  color: #e0e5d8;
  font-size: 0.8125rem;
  line-height: 1.6;
}

.research-questions li::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--bd-sage);
}

.research-inputs {
  margin: 18px 0 24px;
  color: #b6c6ad;
  font-size: 0.6875rem;
  line-height: 1.8;
}

.research-inputs > span {
  margin-inline: 4px;
}

.research-preview-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid #3b5143;
  color: #b6c6ad;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}

.research-preview-footer > span:last-child {
  color: var(--bd-sage);
}

.gate-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 48px;
  margin-top: 64px;
  padding-block: 32px 40px;
  border-top: 1px solid var(--bd-line);
}

.gate-principles h2 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 550;
  letter-spacing: -0.02em;
}

.gate-principles p {
  max-width: 35ch;
  margin: 0;
  color: var(--bd-muted);
  font-size: 0.8125rem;
  line-height: 1.75;
}

.gate-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 24px;
  border-top: 1px solid var(--bd-line);
}

.gate-footer p {
  margin: 0;
  font-size: 0.75rem;
}

.gate-footer p:first-child {
  font-weight: 650;
}

.gate-footer span {
  margin-left: 12px;
  color: var(--bd-muted);
  font-weight: 400;
}

.gate-footer p:last-child {
  color: var(--bd-muted);
}

@media (prefers-reduced-motion: no-preference) {
  .research-panel:not([hidden]) {
    animation: bd-panel-in 220ms var(--bd-ease);
  }
  @keyframes bd-panel-in {
    from { opacity: 0.4; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  body.is-signed-out .btn,
  .research-tabs button,
  .gate-arrow {
    transition: none;
  }
  .gate-signin:hover .gate-arrow {
    transform: none;
  }
}

@media (max-width: 960px) {
  body.is-signed-out .shell-inner {
    padding-inline: 28px;
  }
  .gate-hero {
    gap: 32px;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
  .gate h1 {
    font-size: clamp(2.5rem, 5.7vw, 3.5rem);
  }
  .research-preview {
    padding-inline: 24px;
  }
  .gate-principles {
    gap: 28px;
  }
}

@media (max-width: 700px) {
  body.is-signed-out .shell-inner {
    padding-inline: 24px;
  }
  body.is-signed-out .header-row {
    min-height: 84px;
    gap: 12px;
  }
  body.is-signed-out .brand-name {
    font-size: 1.25rem;
  }
  body.is-signed-out #signin-btn {
    padding-inline: 12px;
    font-size: 0.75rem;
  }
  .gate {
    padding-top: 40px;
  }
  .gate-hero {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .gate h1 {
    font-size: clamp(2.625rem, 10.4vw, 4.25rem);
  }
  .gate-eyebrow {
    margin-bottom: 20px;
    font-size: 0.625rem;
  }
  .gate-lede {
    margin-top: 24px;
  }
  .gate-description {
    max-width: 48ch;
    font-size: 0.875rem;
  }
  .gate-signin {
    min-height: 56px;
    width: 100%;
    justify-content: flex-start;
  }
  .gate-arrow {
    margin-left: auto;
  }
  .gate-access > p {
    font-size: 0.6875rem;
  }
  .research-preview {
    padding: 24px;
  }
  .research-panel h2 {
    font-size: 2.375rem;
  }
  .gate-principles {
    grid-template-columns: 1fr;
    margin-top: 36px;
    gap: 28px;
  }
  .gate-principles p {
    max-width: 48ch;
  }
  .gate-footer {
    gap: 8px;
  }
  .gate-footer span {
    margin-left: 8px;
  }
}