/* ── Variables — dark mode (default) ───────────────── */
:root {
  --bg:          #06101E;
  --bg-1:        #0B1628;
  --bg-2:        #101E36;
  --bg-3:        #162440;
  --border:      rgba(255,255,255,0.07);
  --border-teal: rgba(43,138,138,0.35);
  --text:        #E8EEF7;
  --text-2:      #8FA3BE;
  --text-3:      #4A6180;
  --teal:        #2B8A8A;
  --teal-bright: #3AACAC;
  --teal-glow:   rgba(43,138,138,0.18);
  --pink:        #fc4375;
  --pink-glow:   rgba(252,67,117,0.12);
  --beige:        #7BA23F;
  --beige-border: rgba(123,162,63,0.30);
  --beige-chip:   rgba(123,162,63,0.10);
  --font-code:    'JetBrains Mono', ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
}

/* ── Variables — bright mode ────────────────────────
   Theme colour: #06101E (used as primary text & accent)
   Accent colours (teal, pink, beige) stay the same.
   Nav stays dark — it's the #06101E anchor in both modes.
   ─────────────────────────────────────────────────── */
[data-theme="light"] {
  --bg:          #FDFCFA;
  --bg-1:        #F5F3EE;
  --bg-2:        #EBE8E1;
  --bg-3:        #DED9CF;
  --border:      rgba(1,31,91,0.22);
  --text:        #011f5b;
  --text-2:      #2E4A6B;
  --text-3:      #7A98B8;
  --border-teal: rgba(43,138,138,0.30);
}

/* ── Reset & base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: 'Poppins', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3 { font-family: 'DM Serif Display', 'Crimson Text', Georgia, serif; font-weight: 400; }
p, li, span, button, a { font-family: 'Poppins', system-ui, sans-serif; }

/* ── NAV ───────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 500;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.6rem 2rem;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand { display: flex; align-items: center; gap: 0.75rem; }
.nav-dddi {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}
.nav-vbar { width: 1px; height: 1.2rem; background: var(--border-teal); }

/* ---- DDDI logo swap ---- */
.dddi-logo { display: block; width: auto; flex-shrink: 0; }
.logo-dark  { display: block; }
.logo-light { display: none; }
[data-theme="light"] .logo-dark  { display: none; }
[data-theme="light"] .logo-light { display: block; }

.dddi-logo--nav { height: 34px; }

/* ---- Theme toggle button ---- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-2);
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  margin-left: 0.75rem;
  transition: border-color 0.2s, color 0.2s;
}
.theme-toggle:hover { border-color: var(--teal); color: var(--teal-bright); }
.theme-toggle svg { width: 14px; height: 14px; }
.theme-toggle .icon-sun  { display: block; }
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---- Bright mode nav overrides ---- */
[data-theme="light"] .nav-title        { color: #011f5b; }
[data-theme="light"] .nav-btn          { color: #2E4A6B; }
[data-theme="light"] .nav-btn:hover    { color: #011f5b; }
[data-theme="light"] .nav-ext          { color: #2E4A6B; border-color: rgba(1,31,91,0.20); }
[data-theme="light"] .nav-ext:hover    { color: #011f5b; border-color: #011f5b; }
[data-theme="light"] .theme-toggle     { color: #2E4A6B; border-color: rgba(1,31,91,0.20); }
[data-theme="light"] .theme-toggle:hover { color: #011f5b; border-color: #011f5b; }

/* ---- Bright mode component overrides ---- */
[data-theme="light"] .matrix-wrap {
  border-color: rgba(1,31,91,0.30);
}
[data-theme="light"] .phase-btn:hover {
  background: rgba(6,16,30,0.04);
}
[data-theme="light"] .phase-btn.active {
  background: rgba(43,138,138,0.08);
}
[data-theme="light"] .prompt-block {
  background: #1a2d3d;
  color: #9fdede;
  border-color: rgba(43,138,138,0.35);
}
[data-theme="light"] .copy-btn {
  background: #243a4e;
  border-color: rgba(255,255,255,0.12);
  color: #8FA3BE;
}
[data-theme="light"] .tool-chip-special:hover {
  background: rgba(6,16,30,0.10);
}
.nav-title {
  font-family: 'Crimson Text', serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
}
.nav-links { display: flex; align-items: center; }
.nav-btn {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: 'Poppins', sans-serif;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  padding: 0 1rem;
  height: 58px;
  transition: color 0.2s, border-color 0.2s;
}
.nav-btn:hover { color: var(--text); }
.nav-btn.active { color: var(--teal-bright); border-bottom-color: var(--teal); }
.nav-ext {
  display: inline-flex;
  align-items: center;
  font-family: 'Poppins', sans-serif;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  margin-left: 0.75rem;
  transition: border-color 0.2s, color 0.2s;
}
.nav-ext:hover { border-color: var(--teal); color: var(--teal-bright); }

/* ── Shared layout ─────────────────────────────────── */
.container { max-width: 1280px; margin: 0 auto; padding: 0 2rem; }

/* ── Divider with label ────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border-teal), transparent);
}
.divider span {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
  white-space: nowrap;
}

/* ── Footer ────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  margin-top: 4rem;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  text-align: right;
  font-size: 0.72rem;
  color: var(--text-3);
}
.footer-inner a { color: var(--teal); text-decoration: none; }
.footer-inner a:hover { color: var(--teal-bright); }


/* ════════════════════════════════════════════════════ */
/*  LANDING PAGE                                        */
/* ════════════════════════════════════════════════════ */

.hero {
  position: relative;
  overflow: hidden;
  padding: 6rem 2rem 5rem;
  text-align: center;
}
.hero::before { display: none; }
.hero-content { position: relative; z-index: 1; }
.hero-eyebrow {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 0.75rem;
}
.hero h1 em {
  font-style: italic;
}
.hero-sub {
  font-size: 0.85rem;
  color: var(--text-2);
  max-width: 480px;
  margin: 1.25rem auto 2.5rem;
  line-height: 1.75;
}
.hero-asterisk {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.4rem;
  color: var(--teal);
  opacity: 0.4;
}
.btn-row { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.btn-dark {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.7rem 1.8rem;
  background: var(--teal);
  color: #06101E;
  border: 1px solid var(--teal);
  cursor: pointer;
  text-decoration: none;
  border-radius: 3px;
  transition: background 0.2s, color 0.2s;
}
.btn-dark:hover { background: var(--teal-bright); border-color: var(--teal-bright); }
.btn-ghost {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.7rem 1.8rem;
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  border-radius: 3px;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-bright); }

/* Landing cards */
.landing-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 4rem 2rem;
  max-width: 1280px;
  margin: 0 auto;
}
.lcard {
  position: relative;
  overflow: hidden;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 2.5rem;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
  background: var(--bg-1);
  text-decoration: none;
  display: block;
  color: inherit;
}
.lcard:hover {
  border-color: var(--border-teal);
  transform: translateY(-3px);
  filter: brightness(1.08);
}
.lcard-num {
  font-family: 'Poppins', sans-serif;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--teal);
  margin-bottom: 1.25rem;
}
.lcard h3 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.9rem;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 0.75rem;
}
.lcard p {
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}
.lcard-link {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--teal-bright);
  text-transform: uppercase;
}

/* About strip */
.about-strip {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}
.about-inner {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}
.about-inner::before { display: none; }
.about-inner h4 { font-size: 1rem; color: var(--text); margin-bottom: 0.35rem; }
.about-inner p { font-size: 0.78rem; color: var(--text-2); line-height: 1.65; }
.about-inner a { color: var(--teal); text-decoration: none; }
.about-inner a:hover { color: var(--teal-bright); }


/* ════════════════════════════════════════════════════ */
/*  TOOLS MATRIX                                        */
/* ════════════════════════════════════════════════════ */

.page-header {
  position: relative;
  overflow: hidden;
  padding: 2rem 2rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.page-header::before { display: none; }
.page-header-inner { position: relative; z-index: 1; max-width: 1280px; margin: 0 auto; }
.page-eyebrow {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.5rem;
}
.page-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 0.5rem;
}
.page-desc { font-size: 0.8rem; color: var(--text-2); }

/* Matrix filter pills */
.filter-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.5rem; }
.fpill {
  font-family: 'Poppins', sans-serif;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.9rem;
  border: 1px solid var(--border);
  background: var(--bg-1);
  color: var(--text-2);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}
.fpill:hover { border-color: var(--pink); color: var(--pink); }
.fpill.active { border-color: var(--pink); background: rgba(252,67,117,0.10); color: var(--pink); }

/* Access key */
.access-key {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  border: 1px solid var(--border-teal);
  border-radius: 6px;
  background: rgba(43,138,138,0.05);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.72rem;
  color: var(--text-2);
}
.chip {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  white-space: nowrap;
}
.chip-none { background: transparent; color: var(--text-3); border: 1px solid var(--border); }
.chip-app  { background: var(--beige-chip); color: var(--beige); border: 1px solid var(--beige-border); }
.chip-uni  { background: rgba(43,138,138,0.12); color: var(--teal-bright); border: 1px solid var(--border-teal); }

/* Matrix table */
.matrix-wrap { border: 1px solid var(--beige-border); border-radius: 8px; }
.matrix-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; table-layout: fixed; }
.matrix-table thead tr { background: var(--bg-2); }
.matrix-table thead th {
  padding: 0.85rem 1rem;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  text-align: left;
  border-bottom: 1px solid var(--border);
  width: 13%;
}
/* Function col width set via .fn-col */
.matrix-table thead th:nth-child(4) { width: 15%; } /* Google — long name */
.matrix-table thead th:nth-child(5) { width: 15%; } /* Microsoft — two products */
.matrix-table thead th:first-child { color: var(--teal); border-right: 1px solid var(--border); }
.matrix-table tbody tr { border-bottom: 1px solid var(--border); transition: background 0.15s; }
.matrix-table tbody tr:last-child { border-bottom: none; }
.matrix-table tbody tr:hover td { background: rgba(252,67,117,0.06); }
.matrix-table tbody td { padding: 1rem; vertical-align: top; }
.matrix-table tbody td:first-child {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--teal);
  border-right: 1px solid var(--border);
  white-space: nowrap;
}
.tool-name {
  font-family: 'Crimson Text', serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  display: block;
}
.tool-name:hover { color: var(--pink); }
.tool-desc { font-size: 0.68rem; color: var(--text-3); margin-top: 0.3rem; line-height: 1.5; }
.cell-empty { color: var(--text-3); font-size: 0.75rem; }


/* ════════════════════════════════════════════════════ */
/*  FOR RESEARCHERS                                     */
/* ════════════════════════════════════════════════════ */

.researchers-wrap { display: flex; gap: 0; min-height: 80vh; }

/* Sidebar */
.sidebar {
  width: 220px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 2.5rem 0;
}
.sidebar-sticky { position: sticky; top: 80px; }
.sidebar-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
  padding: 0 1.5rem;
  margin-bottom: 1rem;
}
.phase-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  padding: 0.65rem 1.5rem;
  font-family: 'Poppins', sans-serif;
  font-size: 0.75rem;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.15s;
}
.phase-btn:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.phase-btn.active {
  color: var(--teal-bright);
  border-left-color: var(--teal);
  background: rgba(43,138,138,0.06);
}
.phase-num { font-size: 0.58rem; color: var(--text-3); margin-right: 0.4rem; letter-spacing: 0.05em; }
.phase-btn.active .phase-num { color: var(--teal); }

/* Phase content */
.phase-content { display: none; flex: 1; padding: 2.5rem 3rem 4rem; min-width: 0; }
.phase-content.active { display: block; }

.phase-big-num {
  display: block;
  font-family: 'DM Serif Display', serif;
  font-size: 7rem;
  line-height: 0.85;
  color: rgba(43,138,138,0.08);
  margin-bottom: -1.5rem;
  user-select: none;
}
.phase-title {
  font-family: 'DM Serif Display', serif;
  font-size: 2.4rem;
  color: var(--text);
  margin-bottom: 0.15rem;
}
.phase-sub {
  font-size: 0.72rem;
  color: var(--text-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.phase-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 1.5rem; }

.col-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.75rem;
}
.check-list { list-style: none; }
.check-list li {
  display: flex;
  gap: 0.6rem;
  font-size: 0.8rem;
  color: var(--text-2);
  margin-bottom: 0.6rem;
  line-height: 1.5;
  align-items: flex-start;
}
.check-list li svg { flex-shrink: 0; margin-top: 2px; color: var(--teal); }

/* Risk section */
.risk-box {
  border: 1px solid rgba(252,67,117,0.2);
  border-left: 3px solid var(--pink);
  background: rgba(252,67,117,0.04);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}
.risk-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--pink);
  margin-bottom: 0.6rem;
}
.risk-list { list-style: none; }
.risk-list li {
  font-size: 0.75rem;
  color: var(--text-2);
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.4rem;
  line-height: 1.5;
}
.risk-list li::before { content: '—'; position: absolute; left: 0; color: var(--pink); opacity: 0.6; }

/* Tool chips */
.tool-chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tool-chip {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--beige-border);
  color: var(--text-2);
  border-radius: 3px;
  cursor: pointer;
  background: var(--bg-1);
  transition: all 0.15s;
  text-decoration: none;
}
.tool-chip:hover { border-color: var(--teal); color: var(--teal-bright); }
.tool-fn-chip { text-decoration: none; }
.tool-fn-chip:hover { background: #fc4357; border-color: #fc4357; color: #fff; }
.tool-chip-special {
  border-color: var(--beige-border);
  color: var(--text-2);
  background: var(--beige-chip);
}
.tool-chip-special:hover { background: rgba(6,16,30,0.8); }

/* Prompt block */
.prompt-wrap { margin-top: 2rem; }
.prompt-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 0.6rem;
}
.prompt-block,
.prompt-text,
.uc-mini-prompt,
.code-input {
  font-family: var(--font-code);
  font-weight: 300;
}

code,
pre {
  font-family: var(--font-code);
}

.prompt-block {
  background: #040810;
  border: 1px solid rgba(43,138,138,0.2);
  border-radius: 6px;
  padding: 2rem 1.5rem 1.25rem;
  position: relative;
  font-size: 0.8rem;
  color: #7FCECC;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}
.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-family: 'Poppins', sans-serif;
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-3);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s, color 0.2s;
}
.prompt-block:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--teal-bright); border-color: var(--teal); }

/* Callout */
.callout {
  border-left: 2px solid var(--teal);
  background: rgba(43,138,138,0.05);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.5rem;
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 2rem;
}
.callout strong { color: var(--text); }