/**
 * YCF Design System - Path Robotics Inspired
 * Dark industrial 3D UI: near-black, bold typography, depth, glass
 * https://www.path-robotics.com/
 */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --ycf-bg: #08090c;
  --ycf-bg-soft: #0d0f14;
  --ycf-bg-elevated: #14171d;
  --ycf-bg-card: rgba(20, 23, 29, 0.8);
  --ycf-surface: #1a1e26;
  --ycf-surface-warm: #1e222b;
  --ycf-surface-cream: rgba(30, 34, 43, 0.95);
  --ycf-text: #f1f5f9;
  --ycf-text-muted: #94a3b8;
  --ycf-text-dim: #64748b;
  --ycf-text-inverse: #f8fafc;
  --ycf-primary: #22d3ee;
  --ycf-primary-alt: #06b6d4;
  --ycf-accent: #f59e0b;
  --ycf-border: rgba(148, 163, 184, 0.15);
  --ycf-border-light: rgba(148, 163, 184, 0.25);
  --ycf-nav-bg: rgba(8, 9, 12, 0.9);
  --ycf-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --ycf-shadow-3d: 0 50px 100px -20px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255,255,255,0.03);
  --ycf-font: 'Plus Jakarta Sans', system-ui, sans-serif;
}

* { scroll-behavior: smooth; }

body {
  font-family: var(--ycf-font);
  background: var(--ycf-bg);
  color: var(--ycf-text);
  -webkit-font-smoothing: antialiased;
}

/* 3D depth utilities */
.path-3d-card {
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.4s ease;
}
.path-3d-card:hover {
  transform: translateY(-4px) translateZ(10px);
  box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255,255,255,0.05);
}

.path-glass {
  background: rgba(20, 23, 29, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--ycf-border);
}

/* Nav - dark glass */
.ycf-nav {
  background: var(--ycf-nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--ycf-border);
}

.ycf-nav-light {
  background: rgba(13, 15, 20, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--ycf-border);
}

.ycf-nav a { color: var(--ycf-text-inverse); }
.ycf-nav-light a { color: var(--ycf-text); }

/* Cards - dark 3D */
.ycf-card {
  background: var(--ycf-surface);
  border: 1px solid var(--ycf-border);
  border-radius: 1rem;
  box-shadow: var(--ycf-shadow);
}

.ycf-card-glass {
  background: rgba(26, 30, 38, 0.85);
  backdrop-filter: blur(16px);
  border: 1px solid var(--ycf-border);
  border-radius: 1rem;
}

.ycf-card-dark {
  background: var(--ycf-bg-card);
  border: 1px solid var(--ycf-border);
  border-radius: 1rem;
  color: var(--ycf-text-inverse);
}

/* Buttons - Path style */
.ycf-btn-primary {
  background: linear-gradient(135deg, var(--ycf-primary), var(--ycf-primary-alt));
  color: #0a0a0f;
  border-radius: 0.5rem;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}
.ycf-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px -10px rgba(34, 211, 238, 0.4);
}

.ycf-btn-outline {
  border: 1px solid var(--ycf-border-light);
  background: transparent;
  color: var(--ycf-text);
  border-radius: 0.5rem;
  font-weight: 600;
  transition: all 0.2s;
}
.ycf-btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ycf-primary);
  color: var(--ycf-primary);
}

/* Page backgrounds - dark */
.ycf-page-dark {
  background: var(--ycf-bg);
  min-height: 100vh;
}

.ycf-page-warm {
  background: linear-gradient(180deg, var(--ycf-bg-soft) 0%, var(--ycf-bg) 100%);
  min-height: 100vh;
}

/* Hero card overlay */
.ycf-hero-card {
  background: rgba(20, 23, 29, 0.85);
  backdrop-filter: blur(24px);
  border: 1px solid var(--ycf-border);
  border-radius: 1rem;
  box-shadow: var(--ycf-shadow-3d);
}

/* Section backgrounds */
.ycf-section-alt {
  background: var(--ycf-bg-elevated);
  border-radius: 1rem;
  border: 1px solid var(--ycf-border);
}

/* Typography */
.ycf-heading { color: var(--ycf-text); }
.ycf-heading-inverse { color: var(--ycf-text-inverse); }
.ycf-muted { color: var(--ycf-text-muted); }
.ycf-gradient-text {
  background: linear-gradient(135deg, var(--ycf-primary), #67e8f9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Footer - dark */
.ycf-footer {
  background: #050608;
  color: var(--ycf-text-inverse);
  border-top: 1px solid var(--ycf-border);
}

/* Gallery & project cards */
.ycf-gallery-card {
  background: var(--ycf-surface);
  border: 1px solid var(--ycf-border);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.ycf-gallery-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--ycf-shadow);
}

/* Stats / impact blocks - Path style */
.ycf-stat {
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid var(--ycf-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

/* Form inputs */
.ycf-input {
  background: var(--ycf-bg-elevated);
  border: 1px solid var(--ycf-border);
  border-radius: 0.5rem;
  color: var(--ycf-text);
}
.ycf-input:focus {
  outline: none;
  border-color: var(--ycf-primary);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--ycf-bg); }
::-webkit-scrollbar-thumb { background: #334155; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #475569; }