/* =========================================================================
   PlantSage Design System — Tokens, Components, Utilities
   ========================================================================= */

:root {
  /* ---------- Color: light mode ---------- */
  --ps-green-900: #0E3D2F;
  --ps-green-800: #155845;
  --ps-green-700: #1F7A63;
  --ps-green-600: #2A9579;
  --ps-green-500: #4FB597;
  --ps-green-400: #82CCB4;
  --ps-green-300: #B7E0D2;
  --ps-green-200: #DCEFE7;
  --ps-green-100: #ECF6F1;

  --ps-sage-700: #6B8068;
  --ps-sage-500: #8FA38B;
  --ps-sage-300: #C4D0BE;

  --ps-paper-100: #FBF7EF;
  --ps-paper-200: #F4ECDD;
  --ps-paper-300: #E8DCC4;

  --ps-ink-900: #1B221F;
  --ps-ink-700: #3A4842;
  --ps-ink-500: #5E6E66;
  --ps-ink-300: #94A39B;

  --ps-amber-500: #C58B2E;     /* warning / dosage badge */
  --ps-amber-100: #F6E7C6;
  --ps-rust-600:  #A4452B;     /* contraindication / danger */
  --ps-rust-100:  #F4D9D0;

  /* Reference-matched accents (lavender / sepia / pale yellow) */
  --ps-lavender-700: #6E4F94;
  --ps-lavender-500: #9C7BBE;
  --ps-lavender-300: #C9B6E0;
  --ps-lavender-100: #ECE3F4;
  --ps-sepia-700:    #7A5410;
  --ps-sepia-500:    #B89968;
  --ps-sepia-300:    #E0CFA8;
  --ps-sepia-100:    #F4ECDD;
  --ps-yellow-pale:  #E5BD4F;
  --ps-confidence-high: #2A9579;
  --ps-confidence-med:  #C58B2E;
  --ps-confidence-low:  #A4452B;

  --ps-bg:           var(--ps-paper-100);
  --ps-bg-card:      #FFFDF7;
  --ps-bg-card-2:    #FAF4E5;
  --ps-fg:           var(--ps-ink-900);
  --ps-fg-muted:     var(--ps-ink-500);
  --ps-border:       #E5DBC5;
  --ps-border-strong:#CDBE9A;
  --ps-accent:       var(--ps-green-700);
  --ps-accent-soft:  var(--ps-green-200);

  /* ---------- Typography ---------- */
  --ps-font-sans: 'Inter', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ps-font-serif: 'Fraunces', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --ps-font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* type scale */
  --ps-text-xs:   12px;
  --ps-text-sm:   13px;
  --ps-text-base: 15px;
  --ps-text-md:   17px;
  --ps-text-lg:   20px;
  --ps-text-xl:   26px;
  --ps-text-2xl:  34px;
  --ps-text-3xl:  44px;
  --ps-text-4xl:  60px;

  /* ---------- Spacing & layout ---------- */
  --ps-radius-xs: 4px;
  --ps-radius-sm: 8px;
  --ps-radius:    12px;
  --ps-radius-lg: 18px;
  --ps-radius-xl: 28px;

  --ps-shadow-sm: 0 1px 2px rgba(20, 38, 30, 0.04), 0 1px 4px rgba(20, 38, 30, 0.04);
  --ps-shadow:    0 4px 12px rgba(20, 38, 30, 0.06), 0 1px 3px rgba(20, 38, 30, 0.04);
  --ps-shadow-lg: 0 18px 40px rgba(20, 38, 30, 0.10), 0 4px 12px rgba(20, 38, 30, 0.06);

  --ps-container: 1240px;
  --ps-container-narrow: 960px;
  --ps-grain-opacity: 0.04;
}

/* Dark mode tokens */
[data-theme="dark"] {
  --ps-bg:           #0B1714;
  --ps-bg-card:      #102923;
  --ps-bg-card-2:    #0E211C;
  --ps-fg:           #E7EFE9;
  --ps-fg-muted:     #91A89E;
  --ps-border:       #1F3A33;
  --ps-border-strong:#2C5347;
  --ps-accent:       var(--ps-green-500);
  --ps-accent-soft:  rgba(79, 181, 151, 0.18);
  --ps-paper-100:    #0B1714;
  --ps-paper-200:    #0E211C;
}

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--ps-bg);
  color: var(--ps-fg);
  font-family: var(--ps-font-sans);
  font-size: var(--ps-text-base);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  background-image:
    radial-gradient(1200px 600px at -10% -10%, rgba(31,122,99,0.06), transparent 60%),
    radial-gradient(900px 500px at 110% 10%, rgba(197,139,46,0.05), transparent 60%);
  background-attachment: fixed;
  position: relative;
}

/* paper grain */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.18 0 0 0 0 0.22 0 0 0 0 0.20 0 0 0 0.6 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: var(--ps-grain-opacity);
  mix-blend-mode: multiply;
  z-index: 0;
}

[data-theme="dark"] body::before { mix-blend-mode: screen; opacity: 0.08; }

h1, h2, h3, h4, h5 {
  font-family: var(--ps-font-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ps-fg);
}
h1 { font-size: var(--ps-text-3xl); line-height: 1.05; letter-spacing: -0.02em; }
h2 { font-size: var(--ps-text-2xl); line-height: 1.15; }
h3 { font-size: var(--ps-text-xl); line-height: 1.2; }
h4 { font-size: var(--ps-text-lg); line-height: 1.25; }

p { margin: 0 0 1em; color: var(--ps-fg); }

a { color: var(--ps-accent); text-decoration: none; border-bottom: 1px solid transparent; transition: 120ms ease; }
a:hover { border-bottom-color: var(--ps-accent); }

code, pre { font-family: var(--ps-font-mono); font-size: 0.92em; }

/* =========================================================================
   Layout
   ========================================================================= */
.ps-container { max-width: var(--ps-container); margin: 0 auto; padding: 0 28px; position: relative; z-index: 1; }
.ps-container--narrow { max-width: var(--ps-container-narrow); }
.ps-stack > * + * { margin-top: var(--gap, 16px); }
.ps-row { display: flex; gap: 16px; align-items: center; }
.ps-row--between { justify-content: space-between; }
.ps-grid { display: grid; gap: 20px; }

/* =========================================================================
   Top Nav
   ========================================================================= */
.ps-nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(120%);
  background: rgba(251, 247, 239, 0.78);
  border-bottom: 1px solid var(--ps-border);
}
[data-theme="dark"] .ps-nav { background: rgba(11, 23, 20, 0.78); }

.ps-nav__inner {
  display: flex; align-items: center; gap: 20px;
  padding: 14px 28px;
  max-width: var(--ps-container);
  margin: 0 auto;
}
.ps-logo { display: flex; align-items: center; gap: 10px; font-family: var(--ps-font-serif); font-size: 19px; color: var(--ps-fg); }
.ps-logo__mark {
  width: 34px; height: 34px; border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, var(--ps-green-300), var(--ps-green-700));
  position: relative; box-shadow: inset 0 0 0 1px rgba(0,0,0,0.05);
}
.ps-logo__mark::after {
  content: ""; position: absolute; inset: 6px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FBF7EF' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 2v20'/%3E%3Cpath d='M12 6c2 0 4 1 5 3'/%3E%3Cpath d='M12 6c-2 0-4 1-5 3'/%3E%3Cpath d='M12 12c2 0 4 1 5 3'/%3E%3Cpath d='M12 12c-2 0-4 1-5 3'/%3E%3Cpath d='M12 18c2 0 3 1 4 2'/%3E%3Cpath d='M12 18c-2 0-3 1-4 2'/%3E%3C/svg%3E") center/contain no-repeat;
}
.ps-nav__links { display: flex; gap: 22px; margin-left: 16px; }
.ps-nav__links a { color: var(--ps-ink-700); font-size: 14px; border: none; }
.ps-nav__links a:hover { color: var(--ps-accent); }
.ps-nav__spacer { flex: 1; }
.ps-nav__actions { display: flex; gap: 10px; align-items: center; }

/* =========================================================================
   Buttons
   ========================================================================= */
.ps-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--ps-accent);
  color: #FBF7EF;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: 140ms ease;
}
.ps-btn:hover { background: var(--ps-green-800); transform: translateY(-1px); }
.ps-btn--ghost { background: transparent; color: var(--ps-fg); border-color: var(--ps-border); }
.ps-btn--ghost:hover { background: var(--ps-paper-200); }
.ps-btn--soft { background: var(--ps-accent-soft); color: var(--ps-accent); }
.ps-btn--soft:hover { background: var(--ps-green-300); color: var(--ps-green-900); }
.ps-btn--icon { padding: 9px; border-radius: 10px; }
.ps-btn--lg { padding: 14px 24px; font-size: 15px; }
.ps-btn--xl { padding: 18px 28px; font-size: 16px; }

/* =========================================================================
   Search Bar
   ========================================================================= */
.ps-search {
  display: flex; align-items: center;
  background: var(--ps-bg-card);
  border: 1px solid var(--ps-border);
  border-radius: 14px;
  box-shadow: var(--ps-shadow);
  padding: 6px 6px 6px 18px;
  gap: 8px;
  transition: 200ms ease;
}
.ps-search:focus-within { border-color: var(--ps-accent); box-shadow: 0 0 0 3px var(--ps-accent-soft), var(--ps-shadow); }
.ps-search input {
  flex: 1; border: none; outline: none; background: transparent;
  font-size: 16px; color: var(--ps-fg); padding: 12px 0;
}
.ps-search__icon { width: 18px; height: 18px; color: var(--ps-fg-muted); flex-shrink: 0; }
.ps-search__cmd {
  font-family: var(--ps-font-mono); font-size: 11px;
  padding: 4px 8px; border-radius: 6px;
  background: var(--ps-paper-200); color: var(--ps-fg-muted);
  border: 1px solid var(--ps-border);
}

/* =========================================================================
   Cards
   ========================================================================= */
.ps-card {
  background: var(--ps-bg-card);
  border: 1px solid var(--ps-border);
  border-radius: var(--ps-radius-lg);
  padding: 22px;
  box-shadow: var(--ps-shadow-sm);
  position: relative;
  overflow: hidden;
  transition: 200ms ease;
}
.ps-card:hover { box-shadow: var(--ps-shadow); transform: translateY(-2px); }
.ps-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; gap: 12px; }
.ps-card__title { font-family: var(--ps-font-serif); font-size: var(--ps-text-lg); margin: 0; }
.ps-card__sub { color: var(--ps-fg-muted); font-size: 13px; margin: 4px 0 0; }

/* =========================================================================
   Plant Card
   ========================================================================= */
.ps-plant-card {
  background: var(--ps-bg-card);
  border: 1px solid var(--ps-border);
  border-radius: var(--ps-radius-lg);
  overflow: hidden;
  transition: 200ms ease;
  cursor: pointer;
  position: relative;
}
.ps-plant-card:hover { transform: translateY(-3px); box-shadow: var(--ps-shadow-lg); border-color: var(--ps-border-strong); }
.ps-plant-card__art {
  height: 180px;
  background: linear-gradient(135deg, var(--ps-green-200), var(--ps-paper-200));
  display: flex; align-items: center; justify-content: center;
  position: relative;
  border-bottom: 1px solid var(--ps-border);
}
.ps-plant-card__art svg { width: 80%; height: 80%; opacity: 0.85; }
.ps-plant-card__body { padding: 16px 18px 18px; }
.ps-plant-card__name { font-family: var(--ps-font-serif); font-size: 18px; margin: 0; }
.ps-plant-card__latin { font-style: italic; font-size: 13px; color: var(--ps-fg-muted); margin: 2px 0 10px; }
.ps-plant-card__tags { display: flex; flex-wrap: wrap; gap: 6px; }

/* =========================================================================
   Tag chips
   ========================================================================= */
.ps-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 500;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--ps-paper-200);
  color: var(--ps-ink-700);
  border: 1px solid var(--ps-border);
}
.ps-tag--green { background: var(--ps-green-200); color: var(--ps-green-900); border-color: var(--ps-green-300); }
.ps-tag--amber { background: var(--ps-amber-100); color: #5d3f10; border-color: #e9d39a; }
.ps-tag--rust  { background: var(--ps-rust-100);  color: #5e1f10; border-color: #e9b4a3; }
.ps-tag--ghost { background: transparent; }

/* =========================================================================
   Badges (warning, confidence)
   ========================================================================= */
.ps-warning {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 13px; font-weight: 500;
  background: var(--ps-rust-100);
  color: #5e1f10;
  border-left: 3px solid var(--ps-rust-600);
}
.ps-warning--amber { background: var(--ps-amber-100); color: #5d3f10; border-left-color: var(--ps-amber-500); }

.ps-confidence {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ps-fg-muted);
}
.ps-confidence__dots { display: inline-flex; gap: 3px; }
.ps-confidence__dot { width: 7px; height: 7px; border-radius: 999px; background: var(--ps-border-strong); }
.ps-confidence--high  .ps-confidence__dot:nth-child(-n+3) { background: var(--ps-confidence-high); }
.ps-confidence--med   .ps-confidence__dot:nth-child(-n+2) { background: var(--ps-confidence-med); }
.ps-confidence--low   .ps-confidence__dot:nth-child(-n+1) { background: var(--ps-confidence-low); }

/* =========================================================================
   Evidence Block
   ========================================================================= */
.ps-evidence {
  background: var(--ps-bg-card-2);
  border: 1px solid var(--ps-border);
  border-radius: var(--ps-radius);
  padding: 14px 16px;
  font-size: 13px;
  color: var(--ps-ink-700);
}
.ps-evidence__title { font-weight: 600; color: var(--ps-fg); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.ps-evidence__cite { color: var(--ps-fg-muted); font-size: 12px; }

/* =========================================================================
   Section headers
   ========================================================================= */
.ps-section { padding: 64px 0; }
.ps-section__head { display: flex; justify-content: space-between; align-items: end; margin-bottom: 28px; gap: 24px; }
.ps-section__eyebrow { font-size: 12px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--ps-accent); font-weight: 600; }
.ps-section__title { margin-top: 6px; }

/* =========================================================================
   Tabs
   ========================================================================= */
.ps-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--ps-border); }
.ps-tab {
  padding: 12px 18px;
  font-size: 14px; color: var(--ps-fg-muted);
  border-bottom: 2px solid transparent;
  cursor: pointer; transition: 120ms ease;
  font-weight: 500;
}
.ps-tab:hover { color: var(--ps-fg); }
.ps-tab--active { color: var(--ps-accent); border-bottom-color: var(--ps-accent); }

/* =========================================================================
   Compatibility ring
   ========================================================================= */
.ps-ring {
  width: 220px; height: 220px;
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.ps-ring__num { font-family: var(--ps-font-serif); font-size: 56px; line-height: 1; color: var(--ps-accent); }
.ps-ring__label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.15em; color: var(--ps-fg-muted); margin-top: 6px; }

/* =========================================================================
   Decorative botanical overlays
   ========================================================================= */
.ps-leaf-overlay {
  position: absolute; pointer-events: none;
  opacity: 0.5; z-index: 0;
}

/* =========================================================================
   Footer
   ========================================================================= */
.ps-footer {
  background: var(--ps-green-900);
  color: var(--ps-green-200);
  padding: 56px 0 28px;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}
.ps-footer h4 { color: #FBF7EF; margin-bottom: 12px; font-size: 14px; text-transform: uppercase; letter-spacing: 0.12em; font-family: var(--ps-font-sans); font-weight: 600; }
.ps-footer a { color: var(--ps-green-200); border: none; font-size: 14px; }
.ps-footer a:hover { color: #fff; }
.ps-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1.4fr; gap: 32px; }
.ps-footer__bottom { margin-top: 40px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,0.1); display: flex; justify-content: space-between; font-size: 13px; opacity: 0.7; }

/* =========================================================================
   Utility
   ========================================================================= */
.ps-mute { color: var(--ps-fg-muted); }
.ps-divider { height: 1px; background: var(--ps-border); width: 100%; margin: 24px 0; }
.ps-flex { display: flex; }
.ps-gap-2 { gap: 8px; } .ps-gap-3 { gap: 12px; } .ps-gap-4 { gap: 16px; } .ps-gap-6 { gap: 24px; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 900px) {
  .ps-nav__links { display: none; }
  .ps-footer__grid { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 36px; }
  h2 { font-size: 26px; }
  .ps-section { padding: 40px 0; }
  .ps-container { padding: 0 18px; }
}