/* ============================================================
   NiDB — Neuroinformatics Database (open-source project site)
   Navy-primary palette derived from the NiDB wordmark,
   with squirrel-brown and acorn-gold accents.
   ============================================================ */

:root {
  --navy-dark:    #1E2747;
  --navy:         #2C3968;
  --navy-mid:     #3D4F8A;
  --navy-light:   #4A5FA0;
  --steel:        #6B7DB8;
  --sky:          #E8ECF6;
  --cream:        #F7F9FC;
  --cream-dark:   #EDF1F8;
  --brown:        #7B4F2E;
  --brown-light:  #A0714F;
  --tan:          #E8D5BC;
  --gold:         #C4962A;
  --gold-light:   #E8B84B;
  --code-bg:      #1E2747;
  --text:         #1C2438;
  --text-mid:     #4A5268;
  --text-light:   #7A8198;
  --border:       #D8DEEC;
  --white:        #FFFFFF;
  --shadow-sm:    0 1px 4px rgba(28,36,56,0.08);
  --shadow-md:    0 4px 16px rgba(28,36,56,0.12);
  --shadow-lg:    0 8px 32px rgba(28,36,56,0.16);
  --radius:       8px;
  --radius-lg:    16px;
  --transition:   0.2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--white);
  color: var(--text);
  line-height: 1.65;
}
img { max-width: 100%; display: block; }
a { color: var(--navy-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold); }
ul { list-style: none; }
code, pre { font-family: "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace; }

/* ── Typography ── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; color: var(--navy-dark); }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }
p  { margin-bottom: 1rem; color: var(--text-mid); }
p:last-child { margin-bottom: 0; }

/* ── Layout ── */
.container   { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
.container-narrow { max-width: 820px; margin: 0 auto; padding: 0 1.5rem; }
.section     { padding: 5rem 0; }
.section-sm  { padding: 3rem 0; }
.section-alt { background: var(--cream); }
.section-navy { background: var(--navy-dark); }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header p { max-width: 640px; margin: 0.75rem auto 0; font-size: 1.05rem; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.78rem 1.8rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn-primary      { background: var(--navy); color: var(--white); border-color: var(--navy); }
.btn-primary:hover{ background: var(--navy-dark); border-color: var(--navy-dark); color: var(--white); }
.btn-gold         { background: var(--gold); color: var(--white); border-color: var(--gold); }
.btn-gold:hover   { background: #a87d22; border-color: #a87d22; color: var(--white); }
.btn-outline      { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-outline:hover{ background: var(--navy); color: var(--white); }
.btn-outline-white      { background: transparent; color: var(--white); border-color: rgba(255,255,255,0.6); }
.btn-outline-white:hover{ background: rgba(255,255,255,0.15); color: var(--white); border-color: var(--white); }
.btn-lg { padding: 0.95rem 2.2rem; font-size: 1.02rem; }

/* ── Navigation ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; gap: 2rem; }
.nav-logo { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.15rem; color: var(--navy-dark); }
.nav-logo img { height: 42px; width: auto; }
.nav-logo:hover { color: var(--navy); }
.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-links a {
  padding: 0.45rem 0.85rem; border-radius: var(--radius);
  font-size: 0.92rem; font-weight: 500; color: var(--text-mid);
  transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--navy); background: var(--cream-dark); }
.nav-links .btn { margin-left: 0.5rem; padding: 0.5rem 1.1rem; }
.nav-links .btn-primary, .nav-links .btn-primary:hover { color: var(--white); }
.nav-links .btn-primary:hover { background: var(--navy-dark); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.4rem; color: var(--navy-dark); }
.nav-toggle svg { display: block; }

/* ── Hero ── */
.hero {
  background: linear-gradient(140deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-mid) 100%);
  color: var(--white); padding: 6rem 0 5.5rem; position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='52' height='52' viewBox='0 0 52 52' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h1v52H0zM51 0h1v52h-1z' fill='%23ffffff' fill-opacity='0.025'/%3E%3Cpath d='M0 0v1h52V0zM0 51v1h52v-1z' fill='%23ffffff' fill-opacity='0.025'/%3E%3C/svg%3E");
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3.5rem; align-items: center; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(255,255,255,0.12); color: var(--gold-light);
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.35rem 0.9rem; border-radius: 999px; margin-bottom: 1.4rem;
}
.hero h1 { color: var(--white); margin-bottom: 1.3rem; letter-spacing: -0.01em; }
.hero h1 .accent { color: var(--gold-light); }
.hero .subtitle { font-size: 1.18rem; color: rgba(255,255,255,0.85); margin-bottom: 2.2rem; max-width: 560px; }
.hero .subtitle p { color: rgba(255,255,255,0.85); }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-meta { margin-top: 2.2rem; display: flex; gap: 2rem; flex-wrap: wrap; }
.hero-meta-item { display: flex; flex-direction: column; }
.hero-meta-num { font-size: 1.5rem; font-weight: 700; color: var(--white); }
.hero-meta-label { font-size: 0.8rem; color: rgba(255,255,255,0.65); }

/* Hero visual: logo card */
.hero-visual {
  background: rgba(255,255,255,0.97); border-radius: var(--radius-lg);
  padding: 2.5rem; box-shadow: var(--shadow-lg); text-align: center;
}
.hero-visual img { max-width: 280px; margin: 0 auto 1rem; }
.hero-visual .tag { font-size: 0.85rem; color: var(--text-light); }
.hero-visual .badges { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; margin-top: 1.25rem; }
.pill {
  display: inline-block; font-size: 0.72rem; font-weight: 600;
  padding: 0.25rem 0.7rem; border-radius: 999px;
  background: var(--cream-dark); color: var(--navy);
}
.pill-gold { background: #fbf1d8; color: #8a6a16; }

/* ── Terminal / code block ── */
.terminal {
  background: var(--code-bg); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; text-align: left;
}
.terminal-bar { display: flex; gap: 0.45rem; padding: 0.85rem 1rem; background: rgba(255,255,255,0.06); }
.terminal-bar span { width: 12px; height: 12px; border-radius: 50%; }
.dot-r { background: #ff5f57; } .dot-y { background: #febc2e; } .dot-g { background: #28c840; }
.terminal pre {
  padding: 1.4rem 1.5rem; color: #d8def0; font-size: 0.88rem; line-height: 1.7;
  overflow-x: auto; margin: 0;
}
.terminal .c-prompt { color: var(--gold-light); }
.terminal .c-cmd    { color: #fff; }
.terminal .c-comment{ color: #6b7db8; }
.terminal .c-out    { color: #9aa4c4; }

/* ── Feature cards ── */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.75rem; }
.card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 2rem; box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-icon {
  width: 50px; height: 50px; border-radius: var(--radius);
  background: var(--sky); display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.25rem; font-size: 1.5rem;
}
.card h3 { margin-bottom: 0.6rem; color: var(--navy-dark); }
.card p { font-size: 0.96rem; }

/* ── Modality tags ── */
.modalities { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }
.modality {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--white); border: 1.5px solid var(--border);
  border-radius: 999px; padding: 0.6rem 1.25rem;
  font-weight: 600; font-size: 0.95rem; color: var(--navy);
  transition: all var(--transition);
}
.modality:hover { border-color: var(--navy-light); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.modality .m-icon { font-size: 1.1rem; }

/* ── Workflow steps ── */
.workflow { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; position: relative; }
.wf-step { text-align: center; position: relative; }
.wf-num {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--navy); color: var(--white);
  font-size: 1.3rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 1.25rem;
  box-shadow: 0 0 0 6px var(--sky);
}
.wf-step h3 { margin-bottom: 0.5rem; font-size: 1.1rem; }
.wf-step p { font-size: 0.92rem; }

/* ── Split feature rows ── */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; margin-bottom: 5rem; }
.split:last-child { margin-bottom: 0; }
.split.reverse .split-text { order: 2; }
.split-visual {
  background: var(--cream); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 2.5rem; min-height: 240px; display: flex; align-items: center; justify-content: center;
}
.split-text h2 { margin-bottom: 1rem; }
.feature-checklist { margin-top: 1.25rem; }
.feature-checklist li {
  display: flex; align-items: flex-start; gap: 0.65rem; padding: 0.4rem 0;
  font-size: 0.97rem; color: var(--text-mid);
}
.feature-checklist .check { color: var(--navy-light); font-weight: 700; flex-shrink: 0; margin-top: 1px; }

/* big illustrative icon inside split-visual */
.big-icon { font-size: 5rem; line-height: 1; }
.icon-cluster { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.icon-cluster .ic {
  width: 64px; height: 64px; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-size: 1.7rem;
  box-shadow: var(--shadow-sm);
}

/* ── Install / download ── */
.install-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.5rem; }
.os-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1.75rem; box-shadow: var(--shadow-sm); text-align: center;
}
.os-card .os-icon { font-size: 2.25rem; margin-bottom: 0.75rem; }
.os-card h3 { font-size: 1.1rem; margin-bottom: 0.35rem; }
.os-card p { font-size: 0.88rem; }

/* ── Requirements table ── */
.req-table { width: 100%; border-collapse: collapse; background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.req-table th, .req-table td { text-align: left; padding: 0.9rem 1.25rem; border-bottom: 1px solid var(--border); font-size: 0.95rem; }
.req-table th { background: var(--navy); color: var(--white); font-weight: 600; }
.req-table tr:last-child td { border-bottom: none; }
.req-table td:first-child { font-weight: 600; color: var(--navy-dark); width: 35%; }

/* ── CTA banner ── */
.cta-banner { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%); color: var(--white); text-align: center; padding: 4.5rem 0; }
.cta-banner h2 { color: var(--white); margin-bottom: 1rem; }
.cta-banner p { color: rgba(255,255,255,0.85); margin-bottom: 2rem; font-size: 1.05rem; }
.cta-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ── Notice box ── */
.notice {
  border-left: 4px solid var(--gold); background: #fffaf0;
  padding: 1rem 1.25rem; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0; font-size: 0.93rem; color: var(--text-mid);
}
.notice strong { color: var(--navy-dark); }

/* ── Doc / link cards ── */
.doc-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }
.doc-link-card {
  display: flex; align-items: flex-start; gap: 1rem;
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1.5rem; box-shadow: var(--shadow-sm); transition: all var(--transition);
}
.doc-link-card:hover { border-color: var(--navy-light); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.doc-link-icon { font-size: 1.75rem; flex-shrink: 0; margin-top: 0.1rem; }
.doc-link-card h3 { font-size: 1rem; color: var(--navy-dark); margin-bottom: 0.3rem; }
.doc-link-card p { font-size: 0.87rem; margin: 0; }

/* ── Page header ── */
.page-header { background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%); color: var(--white); padding: 3.5rem 0 3rem; }
.page-header h1 { color: var(--white); font-size: clamp(1.75rem, 4vw, 2.5rem); margin-bottom: 0.5rem; }
.page-header p { color: rgba(255,255,255,0.82); margin: 0; font-size: 1.05rem; max-width: 640px; }
.breadcrumb { font-size: 0.82rem; color: rgba(255,255,255,0.6); margin-bottom: 0.75rem; }
.breadcrumb a { color: rgba(255,255,255,0.72); }
.breadcrumb a:hover { color: var(--white); }

/* ── Prose ── */
.prose { max-width: 800px; margin: 0 auto; }
.prose h2 { font-size: 1.45rem; margin: 2.5rem 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--sky); }
.prose h3 { font-size: 1.12rem; margin: 1.75rem 0 0.5rem; color: var(--navy); }
.prose p { margin-bottom: 1rem; font-size: 0.98rem; }
.prose ul { margin: 0.75rem 0 1rem 1.5rem; list-style: disc; }
.prose ul li { margin-bottom: 0.4rem; font-size: 0.98rem; color: var(--text-mid); }
.prose code {
  background: var(--cream-dark); color: var(--navy-dark);
  padding: 0.12rem 0.4rem; border-radius: 4px; font-size: 0.88em;
}
.prose pre {
  background: var(--code-bg); color: #d8def0; padding: 1.1rem 1.3rem;
  border-radius: var(--radius); overflow-x: auto; margin: 1rem 0; font-size: 0.88rem; line-height: 1.6;
}
.prose pre code { background: none; color: inherit; padding: 0; }
.prose a { color: var(--navy-light); text-decoration: underline; }

/* ── Footer ── */
.footer { background: var(--navy-dark); color: rgba(255,255,255,0.72); padding: 3.5rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 3rem; }
.footer-brand p { font-size: 0.88rem; margin-top: 0.75rem; line-height: 1.6; }
.footer-brand .nav-logo { color: var(--white); margin-bottom: 0.75rem; }
.footer-brand .nav-logo img { background: var(--white); border-radius: 6px; padding: 3px; }
.footer-col h4 { color: var(--white); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1rem; }
.footer-col a { display: block; color: rgba(255,255,255,0.62); font-size: 0.88rem; padding: 0.25rem 0; }
.footer-col a:hover { color: var(--gold-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12); padding-top: 1.5rem;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem; font-size: 0.82rem;
}
.footer-bottom a { color: rgba(255,255,255,0.55); }
.footer-bottom a:hover { color: var(--gold-light); }

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { max-width: 420px; }
  .split, .split.reverse { grid-template-columns: 1fr; gap: 2rem; }
  .split.reverse .split-text { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 3.5rem 0; }
  .nav { position: relative; }
  .nav-links {
    display: none; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0;
    background: var(--white); border-bottom: 1px solid var(--border); padding: 1rem 1.5rem 1.5rem;
    box-shadow: var(--shadow-md); gap: 0.1rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.65rem 0.5rem; }
  .nav-links .btn { margin: 0.5rem 0 0; justify-content: center; }
  .nav-toggle { display: block; }
  .hero-actions { flex-direction: column; }
  .cta-actions { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}