/* =========================================================================
   Optivo — marketing site stylesheet
   Self-contained: system font stack, no external fonts or CDNs.
   Palette derived from the app icon: deep teal → fairway green gradient,
   near-black ink, warm off-white paper.
   ========================================================================= */

:root {
  /* Brand greens */
  --teal-900: #0c2b2a;
  --teal-800: #123e3a;
  --green-700: #1c5b46;
  --green-600: #237a52;
  --green-500: #2e9461;
  --green-400: #46b07a;
  --fairway: #3f9d6f;

  /* Neutrals */
  --ink: #10201c;          /* primary text, near-black with green cast */
  --ink-soft: #3c4f49;     /* secondary text */
  --ink-faint: #6a7d77;    /* tertiary / captions */
  --paper: #f6f4ee;        /* page background — warm off-white */
  --paper-raised: #ffffff; /* card surface */
  --line: #e0ddd3;         /* hairline borders on paper */
  --line-strong: #cdcabd;

  /* Accents */
  --accent: #c69b3a;       /* brass / trophy gold, used sparingly */
  --accent-soft: #e8d9ac;

  /* Functional */
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(16, 32, 28, 0.06), 0 2px 8px rgba(16, 32, 28, 0.05);
  --shadow-md: 0 8px 30px rgba(16, 32, 28, 0.10);
  --shadow-lg: 0 30px 70px rgba(12, 43, 42, 0.22);

  --maxw: 1120px;
  --gutter: clamp(20px, 5vw, 56px);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
          system-ui, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 17px;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }

a { color: var(--green-700); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 0.4em;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 6vw, 4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
h3 { font-size: 1.22rem; letter-spacing: -0.02em; }

p { margin: 0 0 1.1em; }

:focus-visible {
  outline: 3px solid var(--green-500);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --------------------------------------------------------------- Layout */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 9vw, 110px); }
.section--tight { padding-block: clamp(40px, 6vw, 70px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green-600);
  margin: 0 0 1em;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 2px;
  background: var(--green-500);
  display: inline-block;
}

.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
  color: var(--ink-soft);
  max-width: 60ch;
}

/* --------------------------------------------------------------- Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 66px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.2rem;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand .mark { width: 30px; height: 30px; border-radius: 8px; box-shadow: var(--shadow-sm); }

.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  padding: 0; margin-block: 0;
}
.nav-links a {
  display: inline-block;
  padding: 0.45rem 0.7rem;
  border-radius: 9px;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.96rem;
}
.nav-links a:hover { background: rgba(35, 122, 82, 0.09); color: var(--ink); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--green-700); font-weight: 600; }

.nav-toggle { display: none; }

/* --------------------------------------------------------------- Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.8em 1.4em;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: linear-gradient(135deg, var(--green-600), var(--teal-800));
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn--primary:hover { box-shadow: var(--shadow-lg); }

.btn--ghost {
  background: var(--paper-raised);
  color: var(--ink);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
}
.btn--ghost:hover { border-color: var(--green-500); }

.btn-row { display: flex; flex-wrap: wrap; gap: 0.8rem; align-items: center; }

/* --------------------------------------------------------------- Hero */
.hero {
  position: relative;
  overflow: hidden;
  color: #eef3ef;
  background:
    radial-gradient(120% 120% at 85% -10%, rgba(70, 176, 122, 0.55), transparent 55%),
    radial-gradient(120% 130% at -10% 110%, rgba(18, 62, 58, 0.9), transparent 60%),
    linear-gradient(160deg, var(--teal-900), var(--green-700));
}
.hero::after {
  /* subtle topographic contour lines, drawn in CSS via repeating gradients */
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(255, 255, 255, 0.035) 0px,
    rgba(255, 255, 255, 0.035) 1px,
    transparent 1px,
    transparent 46px
  );
  pointer-events: none;
  mask-image: radial-gradient(120% 100% at 70% 20%, #000 30%, transparent 80%);
}
.hero .wrap { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  padding-block: clamp(64px, 10vw, 120px);
}
.hero h1 { color: #fff; }
.hero .eyebrow { color: var(--green-400); }
.hero .eyebrow::before { background: var(--green-400); }
.hero-lead {
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: rgba(238, 243, 239, 0.86);
  max-width: 46ch;
  margin-bottom: 1.8em;
}
.hero .btn--ghost { background: rgba(255,255,255,0.08); color: #fff; border-color: rgba(255,255,255,0.28); }
.hero .btn--ghost:hover { background: rgba(255,255,255,0.16); border-color: rgba(255,255,255,0.5); }

.hero-meta {
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem 2.4rem;
  font-size: 0.9rem;
  color: rgba(238, 243, 239, 0.72);
}
.hero-meta strong { display: block; color: #fff; font-size: 1.5rem; letter-spacing: -0.03em; }

/* Phone mock */
.phone {
  justify-self: center;
  width: min(290px, 80%);
  aspect-ratio: 9 / 19;
  border-radius: 38px;
  padding: 12px;
  background: linear-gradient(160deg, #0a1f1d, #16302c);
  box-shadow: var(--shadow-lg), inset 0 0 0 1px rgba(255,255,255,0.06);
  position: relative;
}
.phone::before { /* notch */
  content: "";
  position: absolute;
  top: 20px; left: 50%; transform: translateX(-50%);
  width: 96px; height: 22px; border-radius: 14px;
  background: #0a1f1d; z-index: 3;
}
.phone-screen {
  height: 100%;
  border-radius: 28px;
  background: var(--paper);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  color: var(--ink);
}
.phone-top {
  padding: 30px 16px 10px;
  background: linear-gradient(160deg, var(--green-700), var(--teal-800));
  color: #fff;
}
.phone-top .label { font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; opacity: 0.75; }
.phone-top .big { font-size: 2.1rem; font-weight: 700; letter-spacing: -0.04em; line-height: 1; margin-top: 4px; }
.phone-top .sub { font-size: 0.7rem; opacity: 0.8; }
.phone-body { padding: 14px 16px; display: grid; gap: 10px; }
.mini-stat {
  display: flex; align-items: baseline; justify-content: space-between;
  padding-bottom: 9px; border-bottom: 1px solid var(--line);
  font-size: 0.78rem; color: var(--ink-soft);
}
.mini-stat b { font-size: 0.95rem; color: var(--ink); letter-spacing: -0.02em; }
.mini-stat .pos { color: var(--green-600); }
.mini-stat .neg { color: #b4533e; }
.spark { display: flex; align-items: flex-end; gap: 4px; height: 46px; margin-top: 2px; }
.spark span { flex: 1; background: linear-gradient(180deg, var(--green-400), var(--green-600)); border-radius: 3px 3px 0 0; opacity: 0.9; }

/* --------------------------------------------------------------- Cards */
.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 3vw, 32px);
  box-shadow: var(--shadow-sm);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.feature {
  position: relative;
}
.feature .ico {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: linear-gradient(150deg, rgba(46,148,97,0.16), rgba(18,62,58,0.12));
  color: var(--green-700);
  margin-bottom: 1rem;
}
.feature .ico svg { width: 24px; height: 24px; }
.feature h3 { margin-bottom: 0.4em; }
.feature p { color: var(--ink-soft); font-size: 0.97rem; margin-bottom: 0; }

/* Split sections (alternating explainer rows) */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.split--rev .split-media { order: -1; }
.split-media {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, #ffffff, #eef2ec);
  box-shadow: var(--shadow-md);
  padding: clamp(20px, 3vw, 34px);
  min-height: 240px;
}

/* SG demo bars */
.sg-row { display: grid; gap: 14px; }
.sg-item { display: grid; grid-template-columns: 120px 1fr 56px; align-items: center; gap: 12px; font-size: 0.9rem; }
.sg-item .name { color: var(--ink-soft); font-weight: 500; }
.sg-track { position: relative; height: 12px; background: #e7eae3; border-radius: 999px; overflow: hidden; }
.sg-track::before { /* center zero line */
  content:""; position:absolute; left:50%; top:-4px; bottom:-4px; width:2px; background: var(--line-strong);
}
.sg-fill { position:absolute; top:0; bottom:0; border-radius:999px; }
.sg-fill.pos { left:50%; background: linear-gradient(90deg, var(--green-500), var(--green-600)); }
.sg-fill.neg { right:50%; background: linear-gradient(90deg, #d98a72, #b4533e); }
.sg-item .val { text-align:right; font-variant-numeric: tabular-nums; font-weight:600; }
.sg-item .val.pos { color: var(--green-600); }
.sg-item .val.neg { color: #b4533e; }

/* --------------------------------------------------------------- Tables */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.modes {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 640px;
}
table.modes th, table.modes td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.modes thead th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  border-bottom: 2px solid var(--line-strong);
}
table.modes tbody th { font-weight: 700; color: var(--ink); white-space: nowrap; }
table.modes td .yes { color: var(--green-600); font-weight: 700; }
table.modes td .no { color: var(--ink-faint); }
table.modes tbody tr:hover { background: rgba(35,122,82,0.04); }

/* --------------------------------------------------------------- FAQ */
.faq-list { display: grid; gap: 12px; }
details.qa {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 4px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease;
}
details.qa[open] { border-color: var(--line-strong); }
details.qa summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  font-weight: 600;
  font-size: 1.04rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  letter-spacing: -0.01em;
}
details.qa summary::-webkit-details-marker { display: none; }
details.qa summary .chev {
  flex: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--green-700);
  transition: transform 0.2s ease;
}
details.qa[open] summary .chev { transform: rotate(45deg); }
details.qa .qa-body { padding: 0 18px 18px; color: var(--ink-soft); }
details.qa .qa-body p:last-child { margin-bottom: 0; }

/* --------------------------------------------------------------- Misc blocks */
.callout {
  background: linear-gradient(150deg, var(--teal-900), var(--green-700));
  color: #eef3ef;
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 56px);
  position: relative;
  overflow: hidden;
}
.callout h2 { color: #fff; }
.callout p { color: rgba(238,243,239,0.85); }
.callout::after {
  content:""; position:absolute; right:-60px; bottom:-60px;
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(70,176,122,0.4), transparent 70%);
}

.pill-list { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.pill-list li {
  font-size: 0.85rem;
  padding: 0.4em 0.9em;
  border-radius: 999px;
  background: rgba(35,122,82,0.1);
  color: var(--green-700);
  font-weight: 500;
}

.checklist { list-style: none; padding: 0; margin: 0 0 1em; display: grid; gap: 10px; }
.checklist li { position: relative; padding-left: 30px; color: var(--ink-soft); }
.checklist li::before {
  content: "";
  position: absolute; left: 0; top: 6px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--green-500);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: 12px; background-repeat: no-repeat; background-position: center;
}

.note {
  border-left: 3px solid var(--green-500);
  background: rgba(35,122,82,0.05);
  padding: 14px 18px;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.prose { max-width: 70ch; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { color: var(--ink-soft); padding-left: 1.3em; }
.prose li { margin-bottom: 0.4em; }
.prose .meta { color: var(--ink-faint); font-size: 0.9rem; }

/* page hero (interior pages) */
.page-hero {
  background:
    radial-gradient(100% 140% at 100% 0%, rgba(46,148,97,0.12), transparent 60%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}
.page-hero .wrap { padding-block: clamp(48px, 7vw, 86px); }
.page-hero p { color: var(--ink-soft); max-width: 62ch; }

/* --------------------------------------------------------------- Footer */
.site-footer {
  background: var(--teal-900);
  color: rgba(238,243,239,0.7);
  padding-block: clamp(40px, 6vw, 64px);
  font-size: 0.94rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
}
.site-footer h4 { color: #fff; font-size: 0.82rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1em; }
.site-footer a { color: rgba(238,243,239,0.78); }
.site-footer a:hover { color: #fff; }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.footer-brand .brand { color: #fff; }
.footer-brand p { max-width: 34ch; margin-top: 0.8em; color: rgba(238,243,239,0.62); }
.footer-bottom {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: space-between;
  font-size: 0.86rem;
  color: rgba(238,243,239,0.5);
}

/* --------------------------------------------------------------- 404 */
.notfound {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
}
.notfound .code {
  font-size: clamp(5rem, 18vw, 11rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 0.9;
  background: linear-gradient(150deg, var(--green-600), var(--teal-800));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* --------------------------------------------------------------- Motion */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); animation: rise 0.7s ease forwards; }
  .reveal[style] { } /* allow inline animation-delay */
  @keyframes rise { to { opacity: 1; transform: none; } }
}

/* --------------------------------------------------------------- Responsive */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .phone { grid-row: 2; margin-top: 1.5rem; }
  .split { grid-template-columns: 1fr; }
  .split--rev .split-media { order: 0; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
    margin-left: auto;
    width: 42px; height: 42px;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    background: var(--paper-raised);
    cursor: pointer;
  }
  .nav-links {
    position: absolute;
    top: 66px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 12px var(--gutter) 18px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.7rem 0.6rem; }
}

@media (max-width: 540px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  body { font-size: 16px; }
  .hero-meta { gap: 1.2rem 1.8rem; }
}