/* ==========================================================================
   SOLARIS / DESIGN SYSTEM
   Redesigned for a Premium, Enterprise-Grade Solar Branding experience.
   Uses Forest Green, Solar Yellow, and pure typography layout tokens.
   ========================================================================== */

:root {
  /* ---- Colors: Premium Renewable Energy Palette ---- */
  --color-primary-green:  #0B4224;   /* Forest Green (Trust, Sustainability) */
  --color-primary-yellow: #FFC72C;   /* Solar Yellow (Energy, Conversion Accent) */
  --color-accent-blue:    #0EA5E9;   /* Sky Blue (Clean sky, tech element) */
  
  --color-ink:            #1F2937;   /* Graphite Slate — primary dark text / elements */
  --color-ink-soft:       #111827;   /* Deep Slate - secondary dark surface */
  --color-paper:          #FFFFFF;   /* Pure White — primary light surface */
  --color-paper-dim:      #F9FAFB;   /* Light Gray Recessed Surface */

  --color-gold:           var(--color-primary-yellow);
  --color-gold-deep:      #D97706;   /* Rich Amber */
  --color-circuit:        #10B981;   /* Tech Green */
  --color-line:           #374151;   /* Thin border on dark */
  --color-line-soft:      #E5E7EB;   /* Thin border on light */
  
  --color-text-dim:       #9CA3AF;   /* Muted text on dark */
  --color-text-dim-light: #4B5563;   /* Muted text on light */
  --color-danger:         #EF4444;

  /* ---- Typography (Outfit & Inter) ---- */
  --font-display: 'Outfit', 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --fs-display-xl: clamp(2.5rem, 5vw + 1rem, 5rem);
  --fs-display-lg: clamp(2.1rem, 3.5vw + 1rem, 3.5rem);
  --fs-display-md: clamp(1.6rem, 2vw + 1rem, 2.25rem);
  --fs-display-sm: clamp(1.25rem, 1.2vw + 1rem, 1.6rem);
  --fs-body-lg:    1.125rem;
  --fs-body:       0.95rem;
  --fs-body-sm:    0.875rem;
  --fs-mono-lg:    clamp(1.35rem, 2vw + 1rem, 2rem);
  --fs-mono:       0.9rem;

  --lh-tight: 1.15;
  --lh-snug:  1.35;
  --lh-body:  1.6;

  /* ---- Spacing scale (8px base) ---- */
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;
  --space-9: 9rem;

  /* ---- Layout & Radii ---- */
  --container-max: 1240px;
  --container-pad: clamp(1.5rem, 5vw, 4rem);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  /* ---- Motion ---- */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 200ms;
  --dur-med: 400ms;

  /* ---- Elevation Shadows ---- */
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.03);
  --shadow-card-dark: 0 10px 30px -10px rgba(0,0,0,0.5), 0 1px 3px rgba(0,0,0,0.2);
  --shadow-elevated: 0 20px 40px -15px rgba(11, 66, 36, 0.12), 0 15px 25px -10px rgba(0,0,0,0.05);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-ink);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: var(--lh-tight);
  margin: 0;
  color: #111827;
  font-weight: 700;
  letter-spacing: -0.02em;
}

p { margin: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

:focus-visible {
  outline: 2px solid var(--color-primary-green);
  outline-offset: 3px;
  border-radius: 4px;
}

.numeral {
  font-family: var(--font-mono);
  font-feature-settings: 'tnum' 1;
}

/* ---- Eyebrow ---- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary-green);
}
.eyebrow::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary-yellow);
  flex-shrink: 0;
  box-shadow: 0 0 8px var(--color-primary-yellow);
}
section.on-dark .eyebrow,
.on-dark .eyebrow { color: var(--color-primary-yellow); }

/* ---- Premium Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-pill);
  border: 1.5px solid transparent;
  transition: all var(--dur-fast) var(--ease-out);
  white-space: nowrap;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-primary-green);
  color: var(--color-paper);
}
.btn-primary:hover {
  background: #08321B;
  box-shadow: 0 4px 12px rgba(11, 66, 36, 0.2);
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--color-primary-yellow);
  color: #111827;
}
.btn-accent:hover {
  background: #E5B220;
  box-shadow: 0 4px 12px rgba(255, 199, 44, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-paper);
  border-color: rgba(255, 255, 255, 0.3);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-paper);
  transform: translateY(-1px);
}

.btn-ghost-dark {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line-soft);
}
.btn-ghost-dark:hover {
  background: var(--color-paper-dim);
  border-color: var(--color-ink);
  transform: translateY(-1px);
}

.btn-block { width: 100%; }

.btn-lg {
  padding: 1rem 2.2rem;
  font-size: 0.95rem;
}

/* ---- Section Rhythm ---- */
.section {
  padding-block: var(--space-8);
  position: relative;
}
.section.on-dark {
  background: var(--color-ink-soft);
  color: var(--color-paper);
}
.section.on-dark h1,
.section.on-dark h2,
.section.on-dark h3,
.section.on-dark h4 {
  color: var(--color-paper);
}
.section-head {
  max-width: 700px;
  margin-bottom: var(--space-6);
}
.section-head h2 {
  font-size: var(--fs-display-md);
  margin-top: var(--space-2);
}
.section-head p {
  margin-top: var(--space-3);
  font-size: var(--fs-body-lg);
  color: var(--color-text-dim-light);
  font-weight: 400;
}
.on-dark .section-head p { color: var(--color-text-dim); }

@media (max-width: 720px) {
  .section { padding-block: var(--space-6); }
}