/* =========================================================================
   Roots & Minds — biology-only rebuild, shared stylesheet
   Visual system carried over from the existing Roots & Minds brand
   (see rootsandminds_visual_source.zip): editorial, calm, tactile,
   independent natural-history publisher x field society x educational
   studio. No pill buttons, no rounded-shadow cards, no gradients,
   no glassmorphism. The old purple EdTech palette is intentionally
   NOT carried into this biology-only build (see MASTER_SPEC §3).
   ========================================================================= */

:root{
  --green-deep:#2F4A3C;
  --green-soft:#5C7A68;
  --terracotta:#98553E;
  --cream:#F7F2E9;
  --paper:#FFFDF9;
  --ink:#2B2822;
  --ink-soft:#5B5648;
  --line:#DED2BC;
  --radius:2px;
  --maxw:1180px;
  --maxw-narrow:860px;
  --font-serif:'Lora', serif;
  --font-sans:'Manrope', sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--cream);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  font-size:16.5px;
}
h1,h2,h3{
  font-family:var(--font-serif);
  font-weight:500;
  line-height:1.18;
  margin:0 0 .5em;
  color:var(--green-deep);
  letter-spacing:-0.01em;
}
h1{font-size:clamp(34px,5vw,56px);}
h2{font-size:clamp(26px,3.4vw,34px);}
h3{font-size:19px;}
p{margin:0 0 1.1em;color:var(--ink);}
a{color:var(--green-deep);}
img,svg{display:block;max-width:100%;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
.narrow{max-width:var(--maxw-narrow);}
section{padding:80px 0;}
section + section{border-top:1px solid var(--line);}
ul.plain{list-style:none;margin:0;padding:0;}

/* Accessibility */
.skip-link{
  position:absolute;left:-9999px;top:0;
  background:var(--paper);color:var(--green-deep);
  padding:12px 20px;z-index:200;border:1px solid var(--green-deep);
  font-weight:700;font-size:14px;text-decoration:none;
}
.skip-link:focus{left:16px;top:16px;}
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible{
  outline:2px solid var(--terracotta);
  outline-offset:3px;
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
}

.eyebrow{
  font-family:var(--font-sans);
  font-size:12.5px;text-transform:uppercase;letter-spacing:1.6px;
  color:var(--terracotta);font-weight:700;margin-bottom:14px;
}

/* NAV */
header.site-nav{
  position:sticky;top:0;z-index:50;
  background:var(--cream);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:18px 28px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.logo{
  font-family:var(--font-serif);font-size:19px;font-weight:600;
  color:var(--green-deep);text-decoration:none;letter-spacing:.1px;
  white-space:nowrap;
}
nav.links{display:flex;gap:22px;align-items:center;flex-wrap:wrap;}
nav.links a{
  font-size:13px;text-decoration:none;color:var(--ink-soft);
  text-transform:uppercase;letter-spacing:.6px;font-weight:600;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
}
nav.links a:hover, nav.links a[aria-current="page"]{
  color:var(--green-deep);border-bottom-color:var(--terracotta);
}
/* Fix: nav link color rules above were overriding button text color
   on the "Ученикам" button (specificity conflict). Force button text
   colors back to what .btn-primary/.btn-secondary intend. */
nav.links a.btn.btn-primary,
nav.links a.btn.btn-primary:hover{color:var(--paper);}
nav.links a.btn.btn-secondary,
nav.links a.btn.btn-secondary:hover{color:var(--green-deep);}
nav.links a.btn.btn-secondary:hover{color:var(--paper);}
nav.links .btn{padding:9px 18px;font-size:13px;}
.burger{
  display:none;background:none;border:1px solid var(--ink);
  width:38px;height:34px;color:var(--green-deep);cursor:pointer;
  font-size:16px;border-radius:var(--radius);
}

/* BUTTONS */
.btn{
  display:inline-block;padding:13px 24px;
  font-weight:700;font-size:14.5px;text-decoration:none;
  border-radius:var(--radius);border:1px solid var(--green-deep);
  letter-spacing:.2px;cursor:pointer;
  transition:background .15s ease, color .15s ease;
  font-family:var(--font-sans);
}
.btn-primary{background:var(--green-deep);color:var(--paper);}
.btn-primary:hover{background:var(--terracotta);border-color:var(--terracotta);}
.btn-secondary{background:transparent;color:var(--green-deep);}
.btn-secondary:hover{background:var(--green-deep);color:var(--paper);}
.btn-on-dark{background:var(--paper);color:var(--green-deep);border-color:var(--paper);}
.btn-on-dark:hover{background:var(--terracotta);color:var(--paper);border-color:var(--terracotta);}
.btn-accent{background:var(--terracotta);color:var(--paper);border-color:var(--terracotta);}
.btn-accent:hover{background:var(--paper);color:var(--green-deep);border-color:var(--paper);}
.btn[disabled]{opacity:.45;cursor:not-allowed;}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px;align-items:center;}
.link-arrow{
  display:inline-block;font-weight:700;font-size:14.5px;
  text-decoration:none;color:var(--green-deep);
  border-bottom:1px solid var(--terracotta);padding-bottom:1px;
}
.link-arrow:hover{color:var(--terracotta);}

/* HERO */
.hero{padding:88px 0 72px;overflow:hidden;}
.hero .lede{font-size:18.5px;color:var(--ink-soft);max-width:640px;}
.hero-grid{
  display:grid;grid-template-columns:1.4fr .6fr;
  align-items:center;gap:24px;position:relative;
}
.hero-content{position:relative;z-index:2;}
.hero-illustration{
  position:relative;z-index:1;
  height:100%;min-height:420px;
  margin-right:-48px;margin-top:-40px;margin-bottom:-40px;
  display:flex;align-items:flex-end;justify-content:flex-end;
  overflow:visible;
}
.hero-illustration img{
  width:100%;max-width:340px;height:auto;
  object-fit:contain;object-position:bottom right;
  opacity:.92;
}
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:0;}
  .hero-illustration{order:2;min-height:0;height:180px;margin:8px 0 0;justify-content:center;align-items:center;}
  .hero-illustration img{max-width:170px;opacity:.7;}
  .hero-content{order:1;}
}

/* Simple page hero (no illustration), used on interior pages */
.page-hero{padding:64px 0 56px;}
.page-hero .lede{max-width:640px;}

/* DIRECTION CARDS — six biology directions, three-column hairline grid */
.direction-cards{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);
  margin-top:8px;
}
.direction-card{background:var(--paper);padding:30px 28px;display:flex;flex-direction:column;}
.direction-icon{width:44px;height:44px;margin-bottom:16px;}
.direction-icon img{width:100%;height:100%;object-fit:contain;border-radius:50%;}
.direction-card h3{font-size:19px;margin-bottom:10px;}
.direction-rule{width:34px;height:1px;background:var(--terracotta);margin-bottom:14px;}
.direction-card p{color:var(--ink-soft);font-size:14.5px;margin:0 0 .85em;}
.direction-card p:last-of-type{margin-bottom:0;flex-grow:1;}
.direction-card .link-arrow{margin-top:16px;font-size:13.5px;}
@media (max-width:900px){.direction-cards{grid-template-columns:1fr 1fr;}}
@media (max-width:640px){.direction-cards{grid-template-columns:1fr;}}

/* PRINCIPLES / NUMBERED LIST ("Как я работаю") */
.principles{display:grid;grid-template-columns:repeat(2,1fr);gap:36px 48px;margin-top:8px;}
.principle .num{
  font-family:var(--font-serif);font-size:14px;color:var(--terracotta);
  letter-spacing:1px;margin-bottom:8px;font-weight:600;
}
.principle h3{font-size:18px;margin-bottom:6px;}
.principle p{color:var(--ink-soft);font-size:15.5px;margin:0;}
@media (max-width:640px){.principles{grid-template-columns:1fr;}}

/* DEMO CARDS */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:8px;}
.card{background:var(--paper);padding:34px 30px;display:flex;flex-direction:column;}
.card h3{margin-bottom:12px;}
.card p{color:var(--ink-soft);font-size:15.5px;flex-grow:1;}
.card .link-arrow{margin-top:16px;}
.card .btn{margin-top:16px;align-self:flex-start;}
@media (max-width:640px){.cards{grid-template-columns:1fr;}}

/* DEMO — pending/placeholder marker */
.demo-pending{
  border:1px dashed var(--terracotta);color:var(--terracotta);
  font-size:12.5px;font-weight:700;text-transform:uppercase;
  letter-spacing:.8px;padding:5px 10px;display:inline-block;margin-top:4px;
}

/* BULLET LIST (dash) */
ul.dash{list-style:none;margin:0;padding:0;}
ul.dash li{
  padding:14px 0;border-top:1px solid var(--line);
  font-size:16px;color:var(--ink);padding-left:20px;position:relative;
}
ul.dash li:last-child{border-bottom:1px solid var(--line);}
ul.dash li:before{content:"—";position:absolute;left:0;color:var(--terracotta);}

/* TRUST LOGOS ("Для школ и организаций") */
.trust-logos{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.trust-logo{background:var(--paper);padding:22px 20px;display:flex;align-items:center;justify-content:center;min-height:76px;}
.trust-logo img{max-height:34px;max-width:100%;width:auto;object-fit:contain;}
.trust-logo.dark{background:var(--green-deep);}
@media (max-width:760px){.trust-logos{grid-template-columns:repeat(2,1fr);}}
@media (max-width:420px){.trust-logos{grid-template-columns:1fr;}}

/* OFFER / SUBSECTIONS GRID */
.offer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:8px;}
.offer{background:var(--paper);padding:26px 24px;}
.offer h3{font-size:16.5px;margin-bottom:8px;}
.offer p{font-size:14.5px;color:var(--ink-soft);margin:0;}
@media (max-width:760px){.offer-grid{grid-template-columns:1fr;}}

/* ABOUT / BIO — circular photo slot per MASTER_SPEC §3 (small circular
   photographs rather than large hero photography). Until a real portrait
   is supplied, shows a decorative placeholder frame; swapping the <img>
   src is the only change needed once a photo exists. */
.about-hero-grid{display:grid;grid-template-columns:1.3fr .7fr;align-items:center;gap:40px;}
.about-photo-slot{
  width:220px;height:220px;border-radius:50%;overflow:hidden;
  border:1px solid var(--line);background:var(--paper);margin:0 auto;
}
.about-photo-slot img{width:100%;height:100%;object-fit:cover;display:block;}
@media (max-width:900px){
  .about-hero-grid{grid-template-columns:1fr;gap:28px;}
  .about-photo-slot{width:160px;height:160px;}
}
.bio-with-photo{display:flex;gap:32px;align-items:flex-start;flex-wrap:wrap;}
.bio-with-photo .bio-text{flex:1;min-width:260px;}
.avatar-photo{width:160px;height:160px;border-radius:50%;overflow:hidden;border:1px solid var(--line);background:var(--paper);flex-shrink:0;}
.avatar-photo img{width:100%;height:100%;object-fit:cover;display:block;}
@media (max-width:640px){
  .bio-with-photo{flex-direction:column;align-items:center;}
  .avatar-photo{margin:0 auto;}
}
.avatar-mark{
  width:180px;height:180px;border-radius:50%;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:15px;color:var(--ink-soft);
  text-align:center;padding:16px;background:var(--paper);margin:0 auto;
}
.credentials-line{font-size:14px;color:var(--ink-soft);margin-top:8px;border-top:1px solid var(--line);padding-top:16px;}
.nature-accents{display:flex;gap:24px;margin-top:28px;align-items:flex-end;justify-content:center;}
.nature-accents img{width:88px;height:auto;opacity:.85;border-radius:50%;}
@media (max-width:640px){.nature-accents{gap:16px;}.nature-accents img{width:64px;}}

/* EXPERIENCE ("Опыт") — headline stat + three grouped cards */
.exp-stat{text-align:center;padding-bottom:32px;}
.exp-stat .num{font-family:var(--font-serif);font-size:clamp(48px,8vw,72px);color:var(--terracotta);line-height:1;}
.exp-stat .label{font-size:15px;color:var(--ink-soft);margin-top:6px;}

/* CALLOUT */
.callout{border:1px solid var(--green-deep);padding:26px 28px;margin:32px 0;background:var(--paper);}
.callout .label{font-family:var(--font-sans);font-size:12px;text-transform:uppercase;letter-spacing:1.2px;font-weight:700;color:var(--green-deep);margin-bottom:10px;}
.callout p{margin:0;color:var(--ink-soft);font-size:15.5px;}

/* PRICING / FORMATS */
.format-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:8px;}
.format-card{background:var(--paper);padding:30px 28px;}
.format-card h3{margin-bottom:10px;}
.format-card p{color:var(--ink-soft);font-size:15px;margin:0 0 .6em;}
.format-price{font-family:var(--font-serif);color:var(--green-deep);font-size:17px;margin-top:6px;}
@media (max-width:640px){.format-cards{grid-template-columns:1fr;}}

.materials-line{
  font-family:var(--font-serif);font-size:17px;color:var(--green-deep);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:20px 0;margin:24px 0;text-align:center;
}

/* CONTACT */
.contact{background:var(--green-deep);color:var(--paper);}
.contact h2{color:var(--paper);}
.contact .lede{color:#d7e0d9;max-width:520px;}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start;}
.contact-options{display:grid;grid-template-columns:1fr;gap:16px;}
.contact-option{background:var(--paper);color:var(--ink);padding:28px 26px;border:1px solid var(--paper);display:flex;flex-direction:column;}
.contact-option h3{margin-bottom:8px;}
.contact-option p{color:var(--ink-soft);font-size:14.5px;margin-bottom:18px;}
.contact-option .btn{align-self:flex-start;}
.form-note{font-size:12.5px;color:#c7d6cb;margin-top:18px;}
.form-note a{color:#fff;}
@media (max-width:760px){.contact-grid{grid-template-columns:1fr;}}

/* STUDENTS / MAGIC LINK */
.auth-box{max-width:420px;margin-top:8px;}
.auth-box label{display:block;font-size:13.5px;font-weight:700;color:var(--green-deep);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px;}
.auth-box input[type="email"]{
  width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-sans);font-size:15.5px;color:var(--ink);background:var(--paper);
  margin-bottom:16px;
}
.auth-box input[type="email"]:focus{border-color:var(--green-deep);}
.auth-note{font-size:13.5px;color:var(--ink-soft);margin-top:14px;}
.auth-status{
  margin-top:18px;padding:14px 16px;border:1px solid var(--line);
  background:var(--paper);font-size:14px;color:var(--ink-soft);display:none;
}
.auth-status.visible{display:block;}

/* Explicit visible TODO / pending marker for missing facts or not-yet-wired features */
.todo-note{font-size:13px;color:var(--terracotta);border:1px dashed var(--terracotta);padding:10px 14px;margin-top:16px;display:inline-block;}

/* MEDIA / IMAGE PLACEHOLDER */
.media-todo{
  border:1px dashed var(--line);
  background:repeating-linear-gradient(135deg,var(--paper),var(--paper) 10px,#f1ead9 10px,#f1ead9 20px);
  display:flex;align-items:center;justify-content:center;
  padding:28px;min-height:160px;
}
.media-todo span{font-family:var(--font-sans);font-size:12.5px;line-height:1.55;text-align:center;max-width:440px;color:var(--ink-soft);}

.accent-phrase{font-family:var(--font-serif);font-style:italic;color:var(--terracotta);}

/* LEGAL PAGES */
.legal h2{margin-top:2em;font-size:23px;}
.legal h3{margin-top:1.4em;font-size:17px;color:var(--ink);}
.legal p, .legal li{color:var(--ink-soft);font-size:15.5px;}
.legal .revision{font-size:13px;color:var(--ink-soft);border-top:1px solid var(--line);padding-top:14px;margin-top:40px;}

/* FOOTER */
footer.site-footer{background:#233329;color:#c7d0c9;padding:40px 0;font-size:13.5px;}
footer.site-footer .wrap{display:flex;flex-direction:column;gap:10px;}
footer.site-footer .legal-line{line-height:1.9;}
footer.site-footer a{color:#c7d0c9;text-decoration:underline;}
footer.site-footer a:hover{color:#fff;}
footer.site-footer .sep{margin:0 6px;color:#5b6a5f;}

@media (max-width:860px){
  nav.links{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--cream);flex-direction:column;gap:0;align-items:flex-start;
    border-bottom:1px solid var(--line);padding:8px 28px 18px;
  }
  nav.links.open{display:flex;}
  nav.links a{padding:10px 0;border-bottom:1px solid var(--line)!important;width:100%;}
  nav.links .btn{margin-top:10px;width:100%;text-align:center;}
  .burger{display:block;}
  section{padding:56px 0;}
}