/* Paper Path — warm modern theme (cream / saffron / navy / green) */
:root{
  --ink:#152019;
  --muted:#65716a;
  --line:#eadccc;
  --bg:#fffaf2;
  --card:#ffffff;
  --blue:#0f2742;
  --saffron:#f97316;
  --saffron-dark:#ea580c;
  --green:#15803d;
  --soft-blue:#fff3df;
  --soft-saffron:#ffedd5;
  --radius:18px;
  --radius-lg:26px;
  --shadow:0 20px 60px rgba(20,31,24,.11);
  --shadow-sm:0 6px 22px rgba(20,31,24,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);
  background:linear-gradient(180deg,#fffaf2 0,#fff 40%,#f9fbf7 100%);background-attachment:fixed}
.container{width:min(1180px,calc(100% - 34px));margin:0 auto}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:none}

/* header */
.site-header{background:rgba(255,255,255,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.nav{display:flex;align-items:center;justify-content:space-between;padding:13px 0}
.logo{display:flex;align-items:center;gap:11px;font-weight:900;font-size:1.12rem;letter-spacing:-.02em;color:var(--ink)}
.logo:hover{text-decoration:none}
.logo-mark{display:block;width:40px;height:40px;border-radius:12px;object-fit:cover;
  border:1px solid var(--line);box-shadow:var(--shadow-sm);background:#fff}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{color:var(--muted);font-weight:700;font-size:.92rem;padding:9px 13px;border-radius:11px;transition:.15s background,.15s color}
.nav-links a.active,.nav-links a:hover{color:var(--blue);background:var(--soft-blue);text-decoration:none}
.mobile-toggle{display:none;border:1px solid var(--line);border-radius:11px;background:#fff;padding:9px 12px;font-weight:800;color:var(--ink);cursor:pointer}

/* hero */
.hero{padding:60px 0 40px;
  background:
   radial-gradient(circle at 8% 12%,rgba(245,158,11,.18),transparent 30%),
   radial-gradient(circle at 88% 18%,rgba(21,128,61,.14),transparent 32%),
   linear-gradient(180deg,#fff,var(--bg))}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
.hero-panel{background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:36px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.78rem;font-weight:900;letter-spacing:.05em;text-transform:uppercase;color:#9a5a00;background:var(--soft-saffron);padding:7px 13px;border-radius:999px}
.eyebrow .dot,.dot{width:9px;height:9px;border-radius:50%;background:var(--saffron)}
.hero h1{font-size:clamp(2.2rem,5.2vw,3.6rem);line-height:1.02;margin:.42em 0 .28em;letter-spacing:-.045em;color:var(--blue)}
.accent{background:linear-gradient(90deg,var(--saffron),var(--green));-webkit-background-clip:text;background-clip:text;color:transparent}
.lede,.lead{max-width:660px;color:var(--muted);font-size:1.07rem;line-height:1.62}
.hero-actions,.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 4px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 20px;border-radius:14px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-weight:900;transition:.15s transform,.15s box-shadow,.15s border-color}
.btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.btn-primary,.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-primary:hover,.primary:hover{background:#0b1d33;color:#fff}
.secondary{background:#fff;border:1px solid var(--line);color:var(--ink)}
.stats{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 18px;box-shadow:var(--shadow-sm)}
.stat strong{display:block;font-size:1.6rem;line-height:1;color:var(--saffron-dark);letter-spacing:-.02em}
.stat span{color:var(--muted);font-size:.85rem}

/* hero info panel (cards column) */
.info-panel{display:flex;flex-direction:column;gap:13px}
.panel{background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.info-panel.panel{padding:22px}
.info-card{padding:18px 20px;border-radius:18px;background:#fff7ed;border:1px solid #fed7aa}
.info-card:nth-child(2){background:#f0fdf4;border-color:#bbf7d0}
.info-card:nth-child(3){background:var(--soft-blue);border-color:#fed7aa}
.info-card h3{margin:0 0 5px;font-size:1.05rem;color:var(--blue);letter-spacing:-.02em}
.info-card p{margin:0;color:var(--muted);line-height:1.5;font-size:.95rem}

/* sections */
.section{padding:36px 0}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:20px}
.section-title{font-size:clamp(1.5rem,3vw,1.95rem);margin:0;letter-spacing:-.035em;color:var(--blue)}
.section-subtitle{margin:6px 0 0;color:var(--muted)}

/* board cards */
.boards-grid,.board-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:16px;padding:44px 0}
.board-card{background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px;color:var(--ink);display:flex;flex-direction:column;gap:9px;box-shadow:var(--shadow-sm);transition:.18s transform,.18s box-shadow}
.board-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:0 24px 70px rgba(18,32,61,.14)}
.board-kicker{font-size:.72rem;color:var(--muted);font-weight:900;text-transform:uppercase;letter-spacing:.08em}
.board-card h2,.board-card h3{margin:0;font-size:1.55rem;color:var(--blue);letter-spacing:-.03em}
.board-card h2 small{font-size:.72rem;color:var(--green);font-weight:800;margin-left:7px;text-transform:uppercase;letter-spacing:.05em}
.board-card p{margin:0;color:var(--muted);font-size:.94rem;line-height:1.55;flex:1}
.board-card .go,.card-arrow{color:var(--blue);font-weight:900;font-size:.94rem}
.board-card.muted{opacity:.72}
.state-strip{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.state-strip span{padding:8px 12px;background:#fff;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-weight:700;font-size:.86rem}

/* how */
.how{padding:14px 0 56px}
.how h2{font-size:1.5rem;color:var(--blue);letter-spacing:-.03em}
.how ol{max-width:760px;color:var(--muted);padding-left:22px}
.how li{margin:11px 0}

/* archive page */
.archive{padding:38px 0 60px}
.archive h1{margin:0 0 6px;font-size:clamp(1.7rem,3.6vw,2.2rem);color:var(--blue);letter-spacing:-.035em}
.archive .sub{color:var(--muted);max-width:700px;margin-top:0}
.filters{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:22px 0 10px;box-shadow:var(--shadow-sm)}
.filters label{display:flex;flex-direction:column;gap:6px;font-size:.74rem;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;min-width:130px}
.filters label.grow{flex:1;min-width:170px}
.filters select,.filters input,select{font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-weight:600;max-width:280px}
.filters select:focus,.filters input:focus{outline:2px solid var(--soft-saffron);border-color:var(--saffron)}
.filters button{font:inherit;font-weight:800;padding:11px 18px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--muted);cursor:pointer}
.filters button:hover{color:var(--saffron-dark);border-color:var(--saffron)}
.count{color:var(--muted);font-size:.9rem;margin:10px 2px}
.empty{background:rgba(255,255,255,.94);border:1px dashed var(--line);border-radius:var(--radius);padding:40px 26px;text-align:center;color:var(--muted)}

.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-size:.95rem}
thead th{text-align:left;font-size:.73rem;text-transform:uppercase;letter-spacing:.06em;color:var(--blue);padding:13px 14px;border-bottom:2px solid var(--line);background:var(--soft-blue)}
tbody td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:#fffdf6}
td.links{min-width:260px}
td small{display:block;color:var(--muted);margin-top:4px}

.dl{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;margin:2px 6px 2px 0;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:.85rem;font-weight:700;color:var(--blue);white-space:nowrap}
.dl:hover{text-decoration:none;border-color:var(--saffron);background:var(--soft-saffron)}
.dl .ext{font-size:.66rem;font-weight:800;letter-spacing:.04em;color:#fff;background:var(--saffron);border-radius:5px;padding:2px 5px}
.dl-zip .ext,.dl-rar .ext{background:var(--green)}
.dl-sol{border-color:var(--green);color:var(--green)}
.dl-sol:hover{border-color:var(--green);background:#f0fdf4}
.dl-sol .ext{background:var(--green)}

/* solutions index */
.progress{background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin:22px 0;box-shadow:var(--shadow-sm)}
.progress-head{color:var(--ink);font-size:.95rem;margin-bottom:10px}
.progress-head strong{color:var(--saffron-dark)}
.progress-bar{height:10px;background:var(--soft-saffron);border-radius:999px;overflow:hidden}
.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--saffron),var(--green));border-radius:999px}
.sol-list{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.sol-list a{display:block;background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:var(--radius);padding:18px;color:var(--ink);box-shadow:var(--shadow-sm);transition:.18s transform,.18s box-shadow}
.sol-list a:hover{text-decoration:none;transform:translateY(-2px);box-shadow:0 18px 50px rgba(18,32,61,.12)}
.sol-list .t{font-weight:800;color:var(--blue);letter-spacing:-.02em}
.sol-list .m{color:var(--muted);font-size:.88rem;margin-top:4px}

/* content (solution/practice/notes) pages */
.solution{max-width:880px;margin:0 auto;padding:38px 17px 72px}
.solution h1{color:var(--blue);font-size:clamp(1.55rem,3.4vw,2.05rem);letter-spacing:-.035em;margin-bottom:2px}
.solution .meta{color:var(--muted);margin-top:0}
.solution .note{background:var(--soft-saffron);border:1px solid #fed7aa;border-radius:14px;padding:13px 16px;font-size:.93rem;color:#83510a;line-height:1.5}
.solution h2{color:var(--saffron-dark);font-size:1.18rem;letter-spacing:-.02em;border-bottom:1px solid var(--line);padding-bottom:7px;margin-top:36px}
.solution .q{background:rgba(255,255,255,.96);border:1px solid var(--line);border-radius:14px;padding:15px 18px;margin:14px 0;box-shadow:var(--shadow-sm)}
.solution .q h3{margin:0 0 8px;font-size:1rem;color:var(--blue)}
.solution .ans{color:var(--ink)}
.solution .final{font-weight:800;color:var(--green)}
.solution .tip{color:var(--muted);font-size:.9rem;font-style:italic}

/* legal */
.legal{padding:42px 0 70px;max-width:820px}
.legal h1{font-size:1.8rem;color:var(--blue);letter-spacing:-.03em}
.legal p{color:var(--muted)}

/* notices */
.notice{border-left:4px solid var(--saffron);padding:12px 15px;background:var(--soft-saffron);border-radius:14px;color:#83510a;line-height:1.45}

/* footer */
.site-footer,.footer{border-top:1px solid var(--line);background:#fff;padding:28px 0;margin-top:34px;color:var(--muted)}
.site-footer p{color:var(--muted);font-size:.88rem;max-width:880px}
.footer .container{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.footer a,.site-footer a{font-weight:800;color:var(--blue)}
.footer a{margin-left:14px}

@media (max-width:900px){
  .hero-grid,.archive-layout{grid-template-columns:1fr}
  .hero h1{font-size:2.4rem}
  /* logo stays left on its own row; nav centers as a tidy block below */
  .nav{flex-wrap:wrap;gap:10px}
  .nav-links{width:100%;justify-content:center;flex-wrap:wrap;gap:5px;border-top:1px solid var(--line);padding-top:10px}
  .nav-links a{padding:8px 12px;font-size:.9rem}
  .mobile-toggle{display:none}
}
@media (max-width:640px){
  .stats{gap:10px}
  .filters label{min-width:46%}
  .nav-links a{padding:8px 11px;font-size:.86rem}
}