/* ============================================================
   TESSERA — corporate layer for /tessera/ and /ru/tessera/
   Governed by TESSERA Brand Identity Guide v2.0 (October 2026):
   - Logo: PM1 SVG (Logo Assets v3.0), never live text; clear space 1X; min 160 px
   - Colour: TESSERA Navy #003579 · White #FFFFFF · Black #000000 (functional only)
   - No secondary palette: no beige, champagne, gold or branded greys
   - Web type: TT Fors Regular (text) / Medium (headings, names, key statements, labels)
   - Sentence case; uppercase only for small labels; emphasis is Medium, never italic
   Global header, navigation and footer keep the personal-site system.
   ============================================================ */

/* Licensed TT Fors webfonts (Latin + Cyrillic), loaded locally. Arial = technical fallback only. */
@font-face {
  font-family: "TT Fors";
  src: url("/assets/fonts/TT_Fors_Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2190-2199, U+2212, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: "TT Fors";
  src: url("/assets/fonts/TT_Fors_Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2190-2199, U+2212, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

.page-tessera {
  --tessera-navy: #003579;     /* core brand colour */
  --tessera-white: #FFFFFF;    /* core background */
  --tessera-black: #000000;    /* functional neutral: body text */
  --tessera-rule: #D5D9E0;     /* neutral interface hairline (structure only, not a brand colour) */
  --tessera-muted: #5B6270;    /* neutral interface text for small captions (not a brand colour) */
  --tessera-font: "TT Fors", Arial, Helvetica, sans-serif;
}

/* ---------- Corporate surface: white core background, structural rules ---------- */
.page-tessera main {
  background: var(--tessera-white);
  color: var(--tessera-black);
  font-family: var(--tessera-font);
  font-weight: 400;
}
.page-tessera main .industries,
.page-tessera main .founder { background: var(--tessera-white); }
.page-tessera main .section,
.page-tessera main .tessera-hero,
.page-tessera main .industries,
.page-tessera main .founder { border-color: var(--tessera-rule); }
.page-tessera main .section + .section { border-top: 1px solid var(--tessera-rule); }
.page-tessera main .route-note,
.page-tessera main .route-step,
.page-tessera main .route-grid,
.page-tessera main .routes,
.page-tessera main .route-card,
.page-tessera main .model-list,
.page-tessera main .model-row,
.page-tessera main .roles-grid,
.page-tessera main .role-col,
.page-tessera main .corridor-grid,
.page-tessera main .corridor-col,
.page-tessera main .industries-thread,
.page-tessera main .tessera-mosaic { border-color: var(--tessera-rule); }

/* ---------- Typography: TT Fors throughout TESSERA content ---------- */
.page-tessera main *,
.page-tessera main .serif { font-family: var(--tessera-font); }

/* Regular: running text */
.page-tessera main p,
.page-tessera main li,
.page-tessera main .profile-copy p,
.page-tessera main .venture-copy,
.page-tessera main .network-note,
.page-tessera main .roles-note,
.page-tessera main .route-step p,
.page-tessera main .route-items,
.page-tessera main .principle p,
.page-tessera main .model-detail,
.page-tessera main .corridor-col li,
.page-tessera main .role-col li {
  font-weight: 400;
  color: var(--tessera-black);
  font-style: normal;
}

/* Medium: headings, names, key statements, labels */
.page-tessera main h1,
.page-tessera main h2,
.page-tessera main h3,
.page-tessera main .section-title,
.page-tessera main .venture-statement,
.page-tessera main .route-note .statement,
.page-tessera main .corridor-statement,
.page-tessera main .makeitwork,
.page-tessera main .founder-name,
.page-tessera main .proof-figure,
.page-tessera main .section-label,
.page-tessera main .route-tag,
.page-tessera main .route-path,
.page-tessera main .route-index,
.page-tessera main .btn {
  font-weight: 500;
  font-style: normal;
}

/* Navy for headings, names and key statements */
.page-tessera main .section-title,
.page-tessera main .venture-statement,
.page-tessera main .route-note .statement,
.page-tessera main .corridor-statement,
.page-tessera main .makeitwork,
.page-tessera main .founder-name,
.page-tessera main .proof-figure,
.page-tessera main .route-card h3,
.page-tessera main .industry h3 {
  color: var(--tessera-navy);
  letter-spacing: -0.005em;
}

/* Scale (TT Fors sets smaller than Cormorant at equal size) */
.page-tessera main .section-title { font-size: clamp(1.6rem, 5.6vw, 2.6rem); line-height: 1.18; max-width: 26ch; text-wrap: balance; }
.page-tessera main .venture-statement { font-size: clamp(1.3rem, 4.6vw, 1.85rem); line-height: 1.3; max-width: 30ch; }
.page-tessera main .route-note .statement,
.page-tessera main .corridor-statement { font-size: clamp(1.1rem, 3.4vw, 1.35rem); line-height: 1.45; max-width: 40ch; }
.page-tessera main .makeitwork { font-size: clamp(1.3rem, 4.2vw, 1.75rem); line-height: 1.35; max-width: 34ch; }
.page-tessera main .founder-name { font-size: clamp(1.5rem, 5vw, 2.1rem); }
.page-tessera main .proof-figure { font-size: clamp(1.4rem, 4.6vw, 1.8rem); }
.page-tessera main .founder-metric .proof-figure { font-size: clamp(1.5rem, 5vw, 2rem); }
.page-tessera main .industry h3 { font-size: 1.2rem; }

/* Small uppercase labels only (navy); no wide tracking in running text */
.page-tessera main .section-label,
.page-tessera main .venture-corridor,
.page-tessera main .route-tag,
.page-tessera main .corridor-col.is-tessera h3,
.page-tessera main .role-col.is-tessera h3 { color: var(--tessera-navy); }
.page-tessera main .route-index { color: var(--tessera-navy); }
.page-tessera main .route-meta,
.page-tessera main .route-note .meta,
.page-tessera main .proof-label,
.page-tessera main .industry-items,
.page-tessera main .industries-thread,
.page-tessera main .route-outcome,
.page-tessera main .corridor-col h3,
.page-tessera main .role-col h3,
.page-tessera main .model-row h3,
.page-tessera main .principle h3,
.page-tessera main .route-step h3 { color: var(--tessera-black); }
.page-tessera main .route-note .meta,
.page-tessera main .proof-label,
.page-tessera main .route-outcome { color: var(--tessera-muted); }
.page-tessera main .industry-items { color: var(--tessera-muted); }
.page-tessera main .accent { color: var(--tessera-navy); }

/* Mosaic line: plain Regular, no italic device */
.page-tessera main .tessera-mosaic p { font-style: normal; font-size: 1rem; color: var(--tessera-black); }

/* Principle rule: navy structural hairline */
.page-tessera main .principle h3::before { background: var(--tessera-navy); }
.page-tessera main .corridor-col.is-tessera { border-color: var(--tessera-rule); }

/* ---------- Buttons ---------- */
.page-tessera main .btn-solid { background: var(--tessera-navy); border-color: var(--tessera-navy); color: var(--tessera-white); }
.page-tessera main .btn-solid:hover, .page-tessera main .btn-solid:focus-visible { background: var(--tessera-white); color: var(--tessera-navy); }
.page-tessera main .btn-line { background: var(--tessera-white); border-color: var(--tessera-navy); color: var(--tessera-navy); }
.page-tessera main .btn-line:hover, .page-tessera main .btn-line:focus-visible { background: var(--tessera-navy); color: var(--tessera-white); }
.page-tessera main a:focus-visible { outline-color: var(--tessera-navy); }

/* ---------- PM1 logo: approved SVG, clear space 1X (X = wordmark cap height ≈ 1/6 of logo width) ---------- */
.tessera-logo {
  display: block;
  width: min(100%, 360px);   /* never below 160 px; at 360 px, X ≈ 60 px */
  margin-block: 3.75rem;     /* ≥ 1X above and below */
}
.tessera-logo img { width: 100%; height: auto; }
@media (max-width: 440px) {
  .tessera-logo { width: min(100%, 300px); margin-block: 3.25rem; }   /* X ≈ 50 px */
}
.page-tessera main .tessera-hero .section-label { margin-bottom: 0; }

/* ---------- Two routes ---------- */
.routes { display: grid; gap: 0; border-top: 1px solid var(--tessera-rule); }

.route-card {
  display: grid;
  gap: 0.6rem;
  padding-block: 1.9rem;
  border-bottom: 1px solid var(--tessera-rule);
}

.route-card .route-tag {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.route-card h3 {
  font-size: clamp(1.15rem, 3.6vw, 1.45rem);
  line-height: 1.25;
}

.route-card .route-path { color: var(--tessera-navy); font-size: 1rem; }
.route-card .route-items { font-size: 0.92rem; line-height: 1.8; max-width: 60ch; }
.route-card .route-outcome { font-size: 0.88rem; line-height: 1.7; max-width: 60ch; }

@media (min-width: 900px) {
  .route-card { grid-template-columns: 17rem 1fr; column-gap: 3rem; align-items: start; }
  .route-card .route-head { display: grid; gap: 0.5rem; }
}

/* ---------- Roles block ---------- */
.roles-grid { display: grid; gap: 0; border-top: 1px solid var(--tessera-rule); margin-top: 2.5rem; }
.role-col { padding-block: 1.6rem; border-bottom: 1px solid var(--tessera-rule); }
.role-col h3 {
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}
.role-col ul { list-style: none; }
.role-col li { font-size: 0.92rem; padding-block: 0.22rem; line-height: 1.6; }
.role-col.is-tessera { border-top: 2px solid var(--tessera-navy); }

@media (min-width: 700px) {
  .roles-grid { grid-template-columns: 1fr 1fr 1fr; }
  .role-col { padding-inline: 2rem; border-bottom: none; }
  .role-col:first-child { padding-left: 0; }
  .role-col:last-child { padding-right: 0; }
  .role-col + .role-col { border-left: 1px solid var(--tessera-rule); }
}

.roles-note { margin-top: 1.5rem; font-size: 0.95rem; line-height: 1.7; max-width: 58ch; }

/* Corridor: TESSERA column marked by a navy structural rule */
.page-tessera main .corridor-col.is-tessera { box-shadow: inset 0 2px 0 var(--tessera-navy); }

/* Guide v2.0: sentence case, no wide tracking in running text — lists and statements in normal case */
.page-tessera main .model-detail { letter-spacing: normal; font-size: 0.92rem; line-height: 1.6; color: var(--tessera-black); }
.page-tessera main .industry-items { text-transform: none; letter-spacing: normal; font-size: 0.92rem; line-height: 1.7; }
.page-tessera main .industries-thread { text-transform: none; letter-spacing: normal; font-size: 1rem; font-weight: 500; color: var(--tessera-navy); }
.page-tessera main .role-col.is-tessera { border-top: 2px solid var(--tessera-navy); }

/* ---------- V6.1 Mobile typography refinement (phones only, ≤ 767px) ----------
   Sizes only. TT Fors Regular/Medium, Navy/White/Black, sentence case and
   layout unchanged (Guide v2.0). Tablet (768px+) and desktop unaffected. */
@media (max-width: 767px) {
  /* Main body text: 17.5px */
  .page-tessera main .venture-copy,
  .page-tessera main .venture-copy p,
  .page-tessera main .profile-copy p,
  .page-tessera main .tessera-mosaic p { font-size: 1.09375rem; line-height: 1.7; }      /* 16 → 17.5px */

  /* Descriptions: 16px (four-stage process, industries, principles, roles) */
  .page-tessera main .route-step p,
  .page-tessera main .industry-items,
  .page-tessera main .principle p,
  .page-tessera main .roles-note { font-size: 1rem; line-height: 1.7; }                 /* 14.7–15.2 → 16px */
  .page-tessera main .route-step h3 { font-size: 0.875rem; }                             /* 13.6 → 14px */

  /* Secondary descriptions and lists: 15px */
  .page-tessera main .route-card .route-items,
  .page-tessera main .route-card .route-outcome,
  .page-tessera main .model-detail,
  .page-tessera main .role-col li,
  .page-tessera main .corridor-col li { font-size: 0.9375rem; line-height: 1.65; }     /* 14.1–14.7 → 15px */

  /* Small labels: 12.5px */
  .page-tessera main .route-card .route-tag,
  .page-tessera main .route-note .meta,
  .page-tessera main .role-col h3 { font-size: 0.78125rem; letter-spacing: 0.14em; }   /* 11.2–11.8 → 12.5px */
}
@media (max-width: 399px) {
  /* Founder metrics: long Russian labels ("национальностей") must stay inside their column */
  .page-tessera main .founder-metric .proof-label { letter-spacing: 0.08em; -webkit-hyphens: auto; hyphens: auto; overflow-wrap: break-word; }
}
@media (max-width: 374px) {
  /* Minor heading correction at 320px only: long titles (EN and RU) were clipped */
  .page-tessera main .section-title { font-size: 1.375rem; }                  /* 25.6 → 22px */
}