/* ============================================
   Project Nobi — Landing Page
   Inspired by Stripe, Linear, Notion
   Pure CSS, no dependencies
   ============================================ */

/* --- Custom Properties --- */
:root {
  --bg: #0a0a0f;
  --bg-elevated: rgba(255,255,255,0.03);
  --bg-elevated-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #ffffff;
  --text-body: #a0a0b0;
  --text-muted: #666680;
  --purple: #6C5CE7;
  --purple-light: #A29BFE;
  --gold: #FFA502;
  --gold-light: #FFEAA7;
  --radius-card: 16px;
  --radius-btn: 12px;
  --radius-pill: 999px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --section-gap: clamp(80px, 12vw, 140px);
  --container: min(1120px, 90vw);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* --- Utility --- */
.container { width: var(--container); margin: 0 auto; }

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 5vw;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10,10,15,0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius-btn);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, opacity 0.2s;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--purple), var(--purple-light));
  color: #fff;
  box-shadow: 0 4px 20px rgba(108,92,231,0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(108,92,231,0.45);
}

.btn-secondary {
  background: transparent;
  color: var(--text-body);
  border: 1px solid var(--border-hover);
}

.btn-secondary:hover {
  border-color: rgba(255,255,255,0.25);
  color: var(--text);
}

.btn-large {
  padding: 14px 32px;
  font-size: 1rem;
  border-radius: var(--radius-btn);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 5vw 80px;
  overflow: hidden;
}

/* Animated gradient orbs */
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
  animation: float 20s ease-in-out infinite;
  pointer-events: none;
}

.hero::before {
  width: 600px;
  height: 600px;
  background: var(--purple);
  top: -10%;
  right: -5%;
  animation-delay: 0s;
}

.hero::after {
  width: 500px;
  height: 500px;
  background: var(--gold);
  bottom: -10%;
  left: -5%;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -40px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

/* Third orb via hero-bg element */
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-bg::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, var(--purple-light), var(--gold));
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  filter: blur(120px);
  opacity: 0.08;
  animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.08; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.12; transform: translate(-50%, -50%) scale(1.15); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  letter-spacing: 0.02em;
}

.pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34d399;
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--text);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--purple-light), var(--gold-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-body);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* --- Social Proof --- */
.proof {
  padding: 48px 5vw;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  max-width: var(--container);
  margin: 0 auto;
  text-align: center;
}

.proof-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.proof-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.proof-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Section Base --- */
.section {
  padding: var(--section-gap) 5vw;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--purple-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color: var(--text-body);
  max-width: 540px;
  line-height: 1.7;
}

/* --- Pillars (Three Features) --- */
.pillars {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  gap: 64px;
}

.pillar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.pillar:nth-child(even) { direction: rtl; }
.pillar:nth-child(even) > * { direction: ltr; }

.pillar-number {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--purple-light);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.pillar-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.2;
}

.pillar-text {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* Pillar visuals */
.pillar-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px;
  transition: border-color 0.3s, background 0.3s;
}

.visual-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-elevated-hover);
}

/* Chat mockup */
.chat-mock { display: flex; flex-direction: column; gap: 14px; }

.chat-bubble {
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 0.875rem;
  line-height: 1.5;
  max-width: 85%;
}

.chat-user {
  background: linear-gradient(135deg, var(--purple), var(--purple-light));
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat-nori {
  background: rgba(255,255,255,0.06);
  color: var(--text-body);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chat-memory {
  font-size: 0.7rem;
  color: var(--purple-light);
  opacity: 0.7;
  padding: 2px 16px 0;
}

/* Lock visual */
.lock-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.lock-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(162,155,254,0.1));
  border: 1px solid rgba(108,92,231,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.lock-layers {
  display: flex;
  gap: 8px;
}

.lock-layer {
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.lock-layer:nth-child(1) {
  background: rgba(108,92,231,0.12);
  color: var(--purple-light);
  border: 1px solid rgba(108,92,231,0.2);
}

.lock-layer:nth-child(2) {
  background: rgba(255,165,2,0.1);
  color: var(--gold);
  border: 1px solid rgba(255,165,2,0.15);
}

/* Network visual */
.network-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.network-nodes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
}

.node {
  aspect-ratio: 1;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  transition: transform 0.3s, border-color 0.3s;
}

.node:hover { transform: scale(1.05); }

.node-active {
  background: rgba(108,92,231,0.1);
  border: 1px solid rgba(108,92,231,0.25);
  color: var(--purple-light);
}

.node-dim {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.network-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

/* --- How It Works --- */
.steps {
  max-width: var(--container);
  margin: 0 auto;
}

.steps-header {
  text-align: center;
  margin-bottom: 64px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
  position: relative;
}

.step {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  transition: border-color 0.3s, background 0.3s, transform 0.2s;
  position: relative;
}

.step:hover {
  border-color: var(--border-hover);
  background: var(--bg-elevated-hover);
  transform: translateY(-2px);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(162,155,254,0.08));
  border: 1px solid rgba(108,92,231,0.2);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--purple-light);
  margin-bottom: 20px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.step-text {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* --- Miners Section --- */
.miners {
  max-width: var(--container);
  margin: 0 auto;
}

.miners-header {
  text-align: center;
  margin-bottom: 48px;
}

.miners-header .section-subtitle {
  margin: 0 auto;
}

.miners-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(52,211,153,0.08);
  border: 1px solid rgba(52,211,153,0.2);
  font-size: 0.75rem;
  font-weight: 600;
  color: #34d399;
  margin-bottom: 20px;
}

.miners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.miner-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  transition: border-color 0.3s, background 0.3s, transform 0.2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.miner-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-elevated-hover);
  transform: translateY(-2px);
}

.miner-card-icon {
  font-size: 1.5rem;
}

.miner-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.miner-card-text {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.6;
}

.miner-card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--purple-light);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
  transition: gap 0.2s;
}

.miner-card:hover .miner-card-link { gap: 8px; }

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding: var(--section-gap) 5vw;
}

.cta-section .section-title {
  margin-bottom: 8px;
}

.cta-section .section-subtitle {
  margin: 0 auto 36px;
}

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 5vw;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-left {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--text); }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links { display: none; }

  .hero { padding: 100px 5vw 60px; min-height: 90vh; }
  .hero h1 { font-size: clamp(2rem, 8vw, 2.75rem); }

  .pillar {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .pillar:nth-child(even) { direction: ltr; }

  .proof-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .miners-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-ctas { flex-direction: column; width: 100%; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
  .proof-grid { grid-template-columns: 1fr 1fr; }
  .cta-buttons { flex-direction: column; }
  .cta-buttons .btn { width: 100%; justify-content: center; }
}

/* --- Fade-in animation --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeUp 0.6s ease-out both;
}

.fade-in-d1 { animation-delay: 0.1s; }
.fade-in-d2 { animation-delay: 0.2s; }
.fade-in-d3 { animation-delay: 0.3s; }
.fade-in-d4 { animation-delay: 0.4s; }

/* ─── Docs Section ─────────────────────────────── */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.doc-card {
  display: flex;
  flex-direction: column;
  padding: 32px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

.doc-card:hover {
  background: rgba(108,92,231,0.06);
  border-color: rgba(108,92,231,0.2);
  transform: translateY(-4px);
}

.doc-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.doc-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.doc-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.doc-meta {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 4px 12px;
  background: rgba(255,255,255,0.04);
  border-radius: 999px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: 12px;
}

/* ─── Logo Image in Nav ─────────────────────────── */
.nav-logo-img {
  height: 32px;
  width: 32px;
  border-radius: 8px;
  vertical-align: middle;
  margin-right: 8px;
  object-fit: contain;
}