/* IPhO section (/ipho/): index, year pages and problem pages (the IMO design, imo.css, with figures and tables). Uses the site's tokens from /style.css, so light and
   dark themes follow the rest of the site. Logical properties (inline-start/end) keep the Arabic blocks right. */

.ipho-page{width:min(1040px,calc(100% - 32px));margin:0 auto;padding:34px 0 80px;line-height:1.7;overflow-wrap:break-word}
.ipho-page h1,.ipho-page h2,.ipho-page h3{font-family:var(--font-display);color:var(--text-primary)}

/* page header */
.ipho-hero{padding:26px 0 30px;margin-bottom:30px;border-bottom:1px solid var(--glass-border)}
.ipho-eyebrow{font-family:var(--font-mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.11em;color:var(--accent-2);margin:0 0 10px}
.ipho-lang[lang="ar"] .ipho-eyebrow,.ipho-lang[lang="zh"] .ipho-eyebrow{font-family:var(--font-body);letter-spacing:.02em}
.ipho-hero h1{font-weight:650;letter-spacing:-.025em;line-height:1.1;margin:0 0 14px;font-size:clamp(2.1rem,5vw,3.6rem)}
.ipho-index .ipho-hero h1{font-size:clamp(2.3rem,6vw,4.4rem)}
.ipho-lede{max-width:760px;color:var(--text-secondary);font-size:clamp(1.02rem,1.8vw,1.2rem);margin:0}
.ipho-stats{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 0;padding:0;list-style:none}
.ipho-stats li{padding:7px 13px;border:1px solid var(--glass-border);border-radius:999px;background:var(--bg-soft);color:var(--text-secondary)}
.ipho-stats strong{color:var(--text-primary)}
.ipho-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:20px 0 0}

.ipho-visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* buttons */
.ipho-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border:1px solid var(--glass-border-strong);border-radius:var(--radius-sm);background:var(--bg-soft);color:var(--text-primary);font-weight:650;text-decoration:none;line-height:1.3;transition:border-color var(--t-fast),background var(--t-fast)}
.ipho-btn:hover{border-color:var(--accent-2);background:var(--glass-hover)}
.ipho-btn.primary{background:var(--accent-2);border-color:transparent;color:var(--text-inverse)}
.ipho-btn.primary:hover{filter:brightness(1.08)}
.ipho-btn svg{flex:none}
.ipho-btn-sub{font-weight:500;font-size:.85em;opacity:.9}

/* index: years grouped by decade */
.ipho-decade{margin:0 0 30px}
.ipho-decade h3{font-size:1.05rem;font-family:var(--font-mono);color:var(--text-muted);font-weight:600;letter-spacing:.06em;margin:0 0 12px}
.ipho-years{display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:12px;margin:0;padding:0;list-style:none}
.ipho-years a{display:flex;flex-direction:column;gap:2px;padding:14px 16px;border:1px solid var(--glass-border);border-radius:var(--radius-md);background:linear-gradient(145deg,var(--bg-raised),rgba(var(--acc2-rgb),.04));color:var(--text-primary);text-decoration:none;transition:border-color var(--t-fast),transform var(--t-fast)}
.ipho-years a:hover{border-color:var(--accent-2);transform:translateY(-2px)}
.ipho-years .ipho-year{font-size:1.45rem;font-weight:700;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.ipho-years .ipho-count{font-size:.82rem;color:var(--text-muted)}
.ipho-index-note{color:var(--text-muted);font-size:.92rem}

/* year page: one card per problem, headed by the linked problem title */
.ipho-list{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;margin:0;padding:0;list-style:none}
.ipho-list>li{min-width:0;margin:0;padding:clamp(18px,3vw,28px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);background:linear-gradient(145deg,var(--bg-raised),rgba(var(--acc1-rgb),.03))}
.ipho-list>li>h2{font-size:1.3rem;line-height:1.3;margin:0 0 8px;font-weight:650}
.ipho-list>li>h2 a{color:var(--text-primary);text-decoration:none}
.ipho-list>li>h2 a:hover{color:var(--accent-2)}
.ipho-list>li>p{color:var(--text-secondary);margin:0}
/* year pages show each full statement (2026-10-23), then a link to the answers and solution, as on the IMO pages */
.ipho-card-statement{margin:6px 0 0}
.ipho-card-statement>:first-child{margin-top:0}
.ipho-card-statement>:last-child{margin-bottom:0}
.ipho-list>li>p.ipho-card-link{margin:16px 0 0;padding-top:14px;border-top:1px solid var(--glass-border);color:inherit}
.ipho-card-link a{font-weight:650;text-decoration:none}

/* problem page */
.ipho-statement{margin:0 0 22px;padding:clamp(18px,3vw,26px);border:1px solid rgba(var(--acc2-rgb),.3);border-inline-start:4px solid var(--accent-2);border-radius:var(--radius-md);background:rgba(var(--acc2-rgb),.05)}
.ipho-statement>p:first-child{margin-top:0}
.ipho-statement>:last-child,.ipho-answer>:last-child{margin-bottom:0}
.ipho-answer>p:last-child>mjx-container[display="true"]:last-child{margin-bottom:0}
.ipho-answer{margin:0 0 22px;padding:16px clamp(18px,3vw,26px);border:1px solid rgba(var(--acc3-rgb),.35);border-inline-start:4px solid var(--accent-3);border-radius:var(--radius-md);background:rgba(var(--acc3-rgb),.07)}
.ipho-answer h2,.ipho-solution>h2{font-size:1.35rem;margin:0 0 8px}
.ipho-solution{margin:30px 0 0}
.ipho-note{font-size:.9rem;color:var(--text-muted);margin-top:.8rem}
.ipho-solution .ipho-note{margin-top:22px;padding-top:12px;border-top:1px solid var(--glass-border)}

/* pagers */
.ipho-pager{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;margin:34px 0 0;padding-top:20px;border-top:1px solid var(--glass-border)}
.ipho-pager a{display:inline-flex;align-items:center;padding:9px 14px;border:1px solid var(--glass-border);border-radius:var(--radius-sm);background:var(--bg-soft);color:var(--text-primary);font-weight:600;text-decoration:none}
.ipho-pager a:hover{border-color:var(--accent-2)}

/* figures (line drawings on white, also in the dark theme) and the task/points tables */
.ipho-fig{margin:1.4rem auto;text-align:center}
.ipho-fig img{max-width:100%;height:auto;background:#fff;border:1px solid var(--glass-border);border-radius:var(--radius-sm);padding:6px;margin-inline:auto}
.ipho-page table{border-collapse:collapse;margin:1rem 0;font-size:.95rem}
.ipho-page th,.ipho-page td{border:1px solid var(--glass-border);padding:.4rem .7rem;text-align:start;vertical-align:top}
.ipho-page th{background:var(--bg-soft);font-weight:650}
/* long compound words in titles (German, Russian) must not push the page sideways */
.ipho-page h1,.ipho-page h2{overflow-wrap:break-word;hyphens:auto}

/* mathematics and figures on phones (2026-10-22 fixes) */
.ipho-page mjx-container[display="true"]{overflow-x:auto;overflow-y:hidden;max-width:100%;min-width:0!important}
.ipho-page mjx-container.ipho-wide{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle}
.ipho-page table{display:block;max-width:100%;overflow-x:auto}
.ipho-page mjx-assistive-mml{max-width:100%!important}
.ipho-lang[dir="rtl"] mjx-container[display="true"],.ipho-lang[dir="rtl"] mjx-container.ipho-wide{direction:ltr}
.ipho-lang[lang="ar"] .breadcrumbs{font-family:var(--font-body)}
.ipho-page pre{overflow-x:auto;line-height:1.25;font-family:var(--font-mono);margin:1rem 0;padding:14px 16px;border:1px solid var(--glass-border);border-radius:var(--radius-sm);background:var(--bg-deep);direction:ltr;text-align:left;unicode-bidi:isolate}
.ipho-page pre code{font-family:inherit}
/* a formula or table that scrolls sideways fades at its end until it is scrolled there (set by the page script) */
.ipho-page .ipho-more{-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 32px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 32px),transparent)}
/* RTL tables scroll from the right: fade their left (far) edge instead (2026-10-23) */
.ipho-lang[dir="rtl"] table.ipho-more{-webkit-mask-image:linear-gradient(270deg,#000 calc(100% - 32px),transparent);mask-image:linear-gradient(270deg,#000 calc(100% - 32px),transparent)}
/* the footer is English: keep it left-to-right on Arabic pages */
.site-footer .footer-inner p{direction:ltr;unicode-bidi:isolate}

@media(max-width:640px){
  .ipho-page{width:min(100% - 22px,1040px);padding-top:22px}
  .ipho-hero{padding-top:12px}
  .ipho-years{grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:9px}
  .ipho-years a{padding:11px 12px}
  .ipho-years .ipho-year{font-size:1.2rem}
  .ipho-pager a{flex:1 1 auto;justify-content:center}
  .ipho-statement,.ipho-answer{padding-inline:12px;border-inline-start-width:3px}
}
@media(min-width:641px){.ipho-pager{display:grid;grid-template-columns:1fr auto 1fr}.ipho-pager a[rel="prev"]{grid-column:1;justify-self:start}.ipho-pager a:not([rel]){grid-column:2}.ipho-pager a[rel="next"]{grid-column:3;justify-self:end}}
@media print{.site-header,.site-footer,.ipho-actions,.ipho-pager,.breadcrumbs{display:none}}