/* ─── Naturopat Design System ─── */
/* ─── Stitch / Material Design 3 color tokens ─── */
:root {
  --clr-background:              #fbf9f5;
  --clr-surface:                 #fbf9f5;
  --clr-surface-bright:          #fbf9f5;
  --clr-surface-dim:             #dbdad6;
  --clr-surface-container-low:   #f5f3ef;
  --clr-surface-container:       #efeeea;
  --clr-surface-container-high:  #eae8e4;
  --clr-surface-container-highest: #e4e2de;
  --clr-surface-container-lowest: #ffffff;
  --clr-surface-variant:         #e4e2de;

  --clr-primary:                 #55615e;
  --clr-on-primary:              #ffffff;
  --clr-primary-container:       #d9e5e1;
  --clr-on-primary-container:    #5b6764;
  --clr-primary-fixed:           #d9e5e1;
  --clr-primary-fixed-dim:       #bdc9c5;
  --clr-inverse-primary:         #bdc9c5;

  --clr-secondary:               #4d6453;
  --clr-on-secondary:            #ffffff;
  --clr-secondary-container:     #cde6d1;
  --clr-on-secondary-container:  #516857;

  --clr-tertiary:                #466551;
  --clr-on-tertiary:             #ffffff;
  --clr-tertiary-container:      #c7ebd1;
  --clr-on-tertiary-container:   #4b6b57;

  --clr-on-background:           #1b1c1a;
  --clr-on-surface:              #1b1c1a;
  --clr-on-surface-variant:      #434846;
  --clr-outline:                 #737876;
  --clr-outline-variant:         #c3c8c5;

  --clr-inverse-surface:         #30312e;
  --clr-inverse-on-surface:      #f2f0ed;

  --clr-error:                   #ba1a1a;
  --clr-on-error:                #ffffff;
  --clr-error-container:         #ffdad6;
  --clr-on-error-container:      #93000a;

  /* Typography */
  --font-headline: 'Noto Serif', Georgia, serif;
  --font-body:     'Manrope', system-ui, sans-serif;

  /* Radii */
  --radius-sm:   0.25rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.5rem;
  --radius-3xl:  2rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(85,97,94,0.08);
  --shadow-lg:   0 20px 40px rgba(77,100,83,0.10);
}

/* ─── Base reset ─── */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--clr-background);
  color: var(--clr-on-surface);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  color: var(--clr-secondary);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

/* Material Symbols weight */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
}

/* ─── Utility classes ─── */
.np-container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}
@media (min-width: 768px) {
  .np-container { padding-inline: 3rem; }
}

.np-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--clr-primary);
  color: var(--clr-on-primary);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}
.np-btn-primary:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-card);
  color: var(--clr-on-primary);
}

.np-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--clr-secondary);
  font-family: var(--font-headline);
  font-size: 1.125rem;
  padding-bottom: 0.125rem;
  border-bottom: 2px solid var(--clr-primary-container);
  text-decoration: none;
  transition: border-color 0.2s ease;
}
.np-btn-ghost:hover { border-color: var(--clr-primary); color: var(--clr-secondary); }

/* Section spacing */
.np-section { padding-block: 5rem; }
@media (min-width: 768px) { .np-section { padding-block: 6rem; } }

/* Card base */
.np-card {
  background: var(--clr-surface-container-low);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}
.np-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ─── Custom scroll-to-top button ─── */
#ast-scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  z-index: 9999;
  display: none; /* shown via JS after 50% scroll */
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: var(--clr-primary-container);
  color: var(--clr-secondary);
  border: 1.5px solid rgba(195,200,197,.6);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(77,100,83,.13);
  cursor: pointer;
  transition: background .2s, transform .2s, border-color .2s, box-shadow .2s;
}
#ast-scroll-top:hover {
  background: var(--clr-primary);
  color: #fff;
  transform: translateY(-3px);
  border-color: var(--clr-primary);
  box-shadow: 0 6px 24px rgba(77,100,83,.22);
}
#ast-scroll-top .material-symbols-outlined {
  font-size: 20px;
  line-height: 1;
}