/* ==========================================================================
   AnnotateIQ — Micro1 Vibe (Light Theme, Black Text, Blue Accent)
   ========================================================================== */

:root {
  --bg-color: #fdfdfd;
  --text-main: #000000;
  --text-muted: #555555;
  --accent: #2563eb;       /* Primary Blue */
  --accent-light: #eff6ff; /* Soft Blue */
  --border: #e5e5e5;
  --card-bg: #ffffff;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ==========================================================================
   Navigation
   ========================================================================== */
.micro-nav-container {
  position: fixed;
  top: 0; width: 100%;
  background: rgba(253, 253, 253, 0.85);
  backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid var(--border);
}
.micro-nav {
  max-width: 1400px; margin: 0 auto; padding: 16px 32px;
  display: flex; justify-content: space-between; align-items: center;
}
.nav-left { display: flex; align-items: center; gap: 48px; }
.nav-brand {
  font-size: 1.4rem; font-weight: 800; color: var(--text-main);
  text-decoration: none; letter-spacing: -0.03em;
}
.nav-links { display: flex; gap: 24px; }
.nav-links a {
  font-size: 0.8rem; font-weight: 500; color: var(--text-muted);
  text-decoration: none; transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }
.nav-links span { font-size: 0.7rem; margin-left: 4px; }

.btn-pill {
  background: var(--text-main); color: #fff;
  padding: 10px 24px; border-radius: 999px;
  font-size: 0.8rem; font-weight: 600; text-decoration: none;
  border: none; cursor: pointer; font-family: inherit;
  transition: background 0.2s, transform 0.2s;
}
.btn-pill:hover { background: var(--accent); transform: scale(1.02); }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.btn-logout {
  background: transparent; color: var(--text-main);
  border: 1.5px solid var(--border);
}
.btn-logout:hover { background: var(--text-main); color: #fff; transform: none; }

/* ==========================================================================
   Hero Section (Image 1)
   ========================================================================== */
.hero-section {
  position: relative;
  height: 90vh; min-height: 600px;
  display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
  margin-bottom: 60px;
}
.hero-bg-gradient {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(circle at center, #ffffff 0%, #f4f4f5 100%);
  z-index: -1;
}
.hero-content h1 {
  font-size: 5.5rem; font-weight: 800; line-height: 1.05;
  letter-spacing: -0.04em; color: var(--text-main);
}

/* ==========================================================================
   Shared content and expert perspectives
   ========================================================================== */
.section { padding: 100px 0; }
.section-title-center { text-align: center; margin-bottom: 80px; }
.section-title-center h2 { font-size: 3rem; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 16px; }
.section-title-center p { font-size: 1.2rem; color: var(--text-muted); line-height: 1.5; }
.icon { width: 16px; height: 16px; border-radius: 4px; }

.about-section { scroll-margin-top: 80px; }
.about-intro { max-width: 760px; margin: 0 auto 72px; }
.eyebrow {
  display: block;
  color: #536078;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.quality-thesis {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  overflow: hidden;
  border-radius: 28px;
  background: #101827;
}
.thesis-statement {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 620px;
  padding: 56px;
  color: #ffffff;
  background: radial-gradient(circle at 0 100%, rgba(67, 101, 145, 0.55), transparent 52%), #101827;
}
.thesis-statement .eyebrow { color: #b9c8dd; }
.thesis-statement h3 {
  margin: 32px 0 28px;
  font-size: clamp(2rem, 3.4vw, 3rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.045em;
  text-wrap: balance;
}
.thesis-statement p {
  max-width: 390px;
  color: #c5ceda;
  font-size: 1rem;
  line-height: 1.75;
}
.thesis-statement strong {
  margin-top: auto;
  padding-top: 64px;
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.6;
}
.quality-system {
  padding: 52px 48px 36px;
  background: #ffffff;
}
.quality-system-heading { margin-bottom: 24px; }
.quality-system-heading h3 {
  max-width: 440px;
  margin-top: 14px;
  font-size: clamp(1.6rem, 2.5vw, 2.15rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.035em;
}
.quality-principles { list-style: none; }
.quality-principles li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 20px;
  padding: 24px 0;
}
.quality-principles li + li { border-top: 1px solid var(--border); }
.principle-number {
  padding-top: 3px;
  color: #536078;
  font: 0.72rem monospace;
}
.quality-principles h4 { margin-bottom: 7px; font-size: 1.08rem; font-weight: 600; letter-spacing: -0.02em; line-height: 1.4; }
.quality-principles p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.65; }
.contribution-section { margin-top: 96px; }
.contribution-heading h3 {
  margin: 16px 0 40px;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.035em;
}
.contribution-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 36px;
  list-style: none;
}
.contribution-steps li { border-top: 1px solid #ccd3de; }
.contribution-number { display: block; margin: 24px 0 20px; color: #536078; font: 0.8rem monospace; }
.contribution-steps h4 { margin-bottom: 12px; font-size: 1.25rem; font-weight: 600; letter-spacing: -0.02em; line-height: 1.3; }
.contribution-steps p { max-width: 320px; color: var(--text-muted); font-size: 0.95rem; line-height: 1.75; }

.expert-invitation {
  padding: 96px 0;
  border-top: 1px solid var(--border);
  background: radial-gradient(ellipse at 50% 110%, #e8eef7, transparent 70%), #f8fafc;
  text-align: center;
}
.expert-invitation h2 {
  margin: 24px 0;
  font-size: clamp(2.25rem, 4.5vw, 3.75rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.045em;
}
.expert-invitation p { color: var(--text-muted); font-size: 1rem; line-height: 1.7; }
.expert-apply-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  min-height: 56px;
  margin-top: 32px;
  padding: 16px 28px;
  font-size: 0.95rem;
}
.expert-apply-link > span { font-size: 1.25rem; }
.expert-apply-link:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #f8fafc;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}
.footer-main {
  display: grid;
  grid-template-columns: minmax(280px, 1.6fr) minmax(160px, 0.7fr) minmax(220px, 0.9fr);
  gap: 72px;
  padding: 64px 0 56px;
}
.footer-brand {
  max-width: 380px;
}
.footer-logo {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--text-main);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  text-decoration: none;
}
.footer-brand p {
  max-width: 320px;
  font-size: 1rem;
  line-height: 1.6;
}
.footer-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}
.footer-heading {
  margin-bottom: 6px;
  color: #8a8a8a;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.footer-links a {
  color: var(--text-main);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.5;
  overflow-wrap: anywhere;
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer-links a:hover {
  color: var(--accent);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.footer-socials {
  display: flex;
  align-items: center;
  gap: 24px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .hero-content h1 { font-size: 4rem; }
  .quality-thesis { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); }
  .thesis-statement { min-height: 580px; padding: 40px 32px; }
  .quality-system { padding: 40px 32px 24px; }
  .footer-main {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
  }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero-content h1 { font-size: 3rem; padding: 0 16px; }
  .about-section { padding: 48px 0 64px; }
  .about-intro { margin-bottom: 40px; }
  .about-intro p { font-size: 1.05rem; line-height: 1.65; }
  .quality-thesis { grid-template-columns: 1fr; border-radius: 20px; }
  .thesis-statement { min-height: 520px; padding: 36px 24px; }
  .thesis-statement h3 { margin-top: 24px; }
  .thesis-statement strong { padding-top: 48px; }
  .quality-system { padding: 36px 24px 20px; }
  .quality-principles li { grid-template-columns: 30px minmax(0, 1fr); gap: 14px; padding: 22px 0; }
  .contribution-section { margin-top: 56px; }
  .contribution-heading h3 { margin-bottom: 28px; }
  .contribution-steps { grid-template-columns: 1fr; gap: 28px; }
  .contribution-number { margin: 20px 0 12px; }
  .contribution-steps p { max-width: none; }
  .expert-invitation { padding: 64px 0; }
  .expert-invitation h2 { font-size: clamp(2rem, 8vw, 3rem); }
  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 40px 28px;
    padding: 48px 0 40px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-bottom {
    min-height: auto;
    padding: 24px 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .expert-apply-link { transition: none; }
  .expert-apply-link:hover { transform: none; }
}
@media (max-width: 420px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: auto;
  }
}