/* ============ DESIGN TOKENS ============ */
:root{
  --paper:#F4F7FB;
  --card:#FFFFFF;
  --ink:#101B33;
  --ink-soft:#4A5872;
  --mist:#DCE4F0;
  --cobalt:#2450E5;
  --cobalt-soft:#E4EAFE;
  --gold:#E8A13B;
  --green:#1B9E77;
  --red:#D64545;
  --radius:14px;
  --radius-lg:22px;
  --shadow:0 6px 24px rgba(16,27,51,.08);
  --font-display:'Bricolage Grotesque',system-ui,sans-serif;
  --font-body:'IBM Plex Sans',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,monospace;
}
[data-theme="dark"]{
  --paper:#0B1220;
  --card:#121C30;
  --ink:#E8EEF9;
  --ink-soft:#9AA9C7;
  --mist:#26334F;
  --cobalt:#6E8CFF;
  --cobalt-soft:#1A2647;
  --gold:#F0B860;
  --shadow:0 6px 24px rgba(0,0,0,.35);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *,*::before,*::after{animation:none!important;transition:none!important}}
body{font-family:var(--font-body);background:var(--paper);color:var(--ink);line-height:1.6;transition:background .3s,color .3s}
:focus-visible{outline:3px solid var(--cobalt);outline-offset:2px;border-radius:4px}
button{font-family:inherit;cursor:pointer}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.bridge{height:3px;border:none;background:linear-gradient(90deg,var(--cobalt),var(--gold));border-radius:2px;width:72px;margin:0 0 18px}
.eyebrow{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cobalt)}
h2{font-family:var(--font-display);font-size:clamp(1.6rem,3.4vw,2.3rem);font-weight:700;letter-spacing:-.01em;margin:6px 0 10px}
.section{padding:72px 0}
.section p.lead{color:var(--ink-soft);max-width:620px}

/* ============ HEADER ============ */
header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--paper) 85%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--mist)}
.nav{display:flex;align-items:center;gap:22px;height:64px}
.logo{font-family:var(--font-display);font-weight:800;font-size:1.25rem;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px}
.logo .dot{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--cobalt),var(--gold));display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:.7rem;font-weight:700}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{color:var(--ink-soft);text-decoration:none;font-weight:500;font-size:.92rem;padding:8px 12px;border-radius:8px}
.nav-links a:hover{color:var(--ink);background:var(--cobalt-soft)}
.icon-btn{background:var(--card);border:1px solid var(--mist);border-radius:10px;width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;color:var(--ink);font-size:1rem}
.icon-btn:hover{border-color:var(--cobalt)}
.menu-btn{display:none}
@media(max-width:820px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--card);flex-direction:column;padding:12px;border-bottom:1px solid var(--mist);box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .menu-btn{display:inline-flex}
}

/* ============ HERO ============ */
.hero{padding:26px 0 30px}
.hero-grid{display:grid;gap:14px}
.hello{font-family:var(--font-display);font-weight:800;font-size:clamp(2.4rem,6.5vw,4.6rem);line-height:1.05;letter-spacing:-.02em}
.hello.compact{font-size:clamp(1.6rem,3.6vw,2.5rem);text-align:center;line-height:1.15}
.hello .rotator{color:var(--cobalt);display:inline-block;min-width:5ch}
.hello.compact .rotator{min-width:0}
.hello .rotator.fade{animation:flip .5s ease}
@keyframes flip{0%{opacity:0;transform:translateY(12px) rotateX(60deg)}100%{opacity:1;transform:none}}
.hero-sub{color:var(--ink-soft);font-size:1.06rem;max-width:640px;margin:10px 0 4px}
.hero-badges{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px;font-size:.85rem;color:var(--ink-soft)}
.hero-badges span{display:inline-flex;align-items:center;gap:6px}
.hero-badges b{color:var(--ink)}

/* ============ TRANSLATOR ============ */
.translator{background:var(--card);border:1px solid var(--mist);border-radius:var(--radius-lg);box-shadow:var(--shadow);margin-top:18px;overflow:hidden}
.lang-bar{display:grid;grid-template-columns:1fr 56px 1fr;align-items:center;border-bottom:1px solid var(--mist)}
.lang-select{width:100%;border:none;background:transparent;color:var(--ink);font:600 .95rem var(--font-body);padding:16px 18px;appearance:none;cursor:pointer}
.lang-select:hover{background:var(--cobalt-soft)}
.swap-btn{width:42px;height:42px;margin:0 auto;border-radius:50%;border:none;background:var(--cobalt);color:#fff;font-size:1.05rem;display:flex;align-items:center;justify-content:center;transition:transform .3s;box-shadow:0 3px 10px rgba(36,80,229,.35)}
.swap-btn:hover{transform:rotate(180deg)}
.panes{display:grid;grid-template-columns:1fr 1fr}
.pane{padding:18px;display:flex;flex-direction:column;min-height:230px}
.pane + .pane{border-left:1px solid var(--mist)}
textarea{flex:1;border:none;background:transparent;resize:none;font:1.05rem/1.6 var(--font-body);color:var(--ink);min-height:150px}
textarea::placeholder{color:var(--ink-soft);opacity:.7}
textarea:focus{outline:none}
.output-box{flex:1;font-size:1.05rem;white-space:pre-wrap;min-height:150px;color:var(--ink)}
.output-box .hint{color:var(--ink-soft);font-size:.92rem}
.pane-tools{display:flex;align-items:center;gap:6px;flex-wrap:wrap;padding-top:12px;border-top:1px dashed var(--mist);margin-top:12px}
.counters{font-family:var(--font-mono);font-size:.74rem;color:var(--ink-soft);margin-right:auto}
.tool{border:1px solid var(--mist);background:transparent;color:var(--ink-soft);border-radius:8px;padding:6px 10px;font-size:.8rem;display:inline-flex;align-items:center;gap:5px}
.tool:hover{color:var(--cobalt);border-color:var(--cobalt)}
.tool.primary{background:var(--cobalt);border-color:var(--cobalt);color:#fff;font-weight:600;padding:8px 18px;font-size:.88rem}
.tool.primary:hover{filter:brightness(1.08)}
.tool.faved{color:var(--gold);border-color:var(--gold)}
.tone-row{display:flex;gap:6px;align-items:center;padding:12px 18px;border-top:1px solid var(--mist);flex-wrap:wrap}
.tone-row label{font-size:.8rem;color:var(--ink-soft);margin-right:4px}
.chip{border:1px solid var(--mist);background:transparent;color:var(--ink-soft);border-radius:999px;padding:5px 13px;font-size:.8rem}
.chip.active{background:var(--cobalt-soft);border-color:var(--cobalt);color:var(--cobalt);font-weight:600}
.kbd-hint{margin-left:auto;font-family:var(--font-mono);font-size:.72rem;color:var(--ink-soft)}
kbd{border:1px solid var(--mist);border-bottom-width:2px;border-radius:5px;padding:1px 5px;font-family:var(--font-mono);font-size:.72rem}
@media(max-width:720px){
  .panes{grid-template-columns:1fr}
  .pane + .pane{border-left:none;border-top:1px solid var(--mist)}
  .kbd-hint{display:none}
}

/* ============ HISTORY ============ */
.history-wrap{margin-top:16px;display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:720px){.history-wrap{grid-template-columns:1fr}}
.mini-card{background:var(--card);border:1px solid var(--mist);border-radius:var(--radius);padding:16px 18px}
.mini-card h3{font-family:var(--font-display);font-size:.95rem;font-weight:700;display:flex;align-items:center;gap:8px;margin-bottom:8px}
.mini-card ul{list-style:none;font-size:.85rem;color:var(--ink-soft);max-height:130px;overflow:auto}
.mini-card li{padding:6px 0;border-bottom:1px dashed var(--mist);display:flex;gap:8px;justify-content:space-between;align-items:baseline}
.mini-card li b{color:var(--ink);font-weight:500}
.mini-card .empty{padding:8px 0;font-style:italic}
.mini-card .pair{font-family:var(--font-mono);font-size:.68rem;color:var(--cobalt);white-space:nowrap}

/* ============ FEATURES ============ */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid-3,.grid-4{grid-template-columns:1fr}}
.feature{background:var(--card);border:1px solid var(--mist);border-radius:var(--radius);padding:22px}
.feature .icn{font-size:1.5rem;display:inline-flex;width:44px;height:44px;align-items:center;justify-content:center;background:var(--cobalt-soft);border-radius:12px;margin-bottom:12px}
.feature h3{font-family:var(--font-display);font-size:1.02rem;font-weight:700;margin-bottom:6px}
.feature p{font-size:.88rem;color:var(--ink-soft)}

/* ============ DOCS UPLOAD ============ */
.dropzone{border:2px dashed var(--mist);border-radius:var(--radius-lg);background:var(--card);padding:44px 20px;text-align:center;transition:border-color .2s}
.dropzone.drag{border-color:var(--cobalt);background:var(--cobalt-soft)}
.dropzone .big{font-size:2rem}
.dropzone p{color:var(--ink-soft);font-size:.9rem;margin-top:6px}
.filetypes{display:flex;gap:8px;justify-content:center;margin-top:14px;flex-wrap:wrap}
.filetypes span{font-family:var(--font-mono);font-size:.72rem;border:1px solid var(--mist);border-radius:6px;padding:3px 9px;color:var(--ink-soft)}
.doc-status{margin-top:14px;font-size:.9rem;color:var(--green);font-weight:600;min-height:1.4em;text-align:center}

/* ============ TOOLS TABS ============ */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.tab-btn{border:1px solid var(--mist);background:var(--card);color:var(--ink-soft);border-radius:999px;padding:8px 18px;font-size:.88rem;font-weight:500}
.tab-btn.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.tool-panel{background:var(--card);border:1px solid var(--mist);border-radius:var(--radius-lg);padding:22px;display:none}
.tool-panel.active{display:block}
.tool-panel textarea{width:100%;border:1px solid var(--mist);border-radius:10px;padding:12px;min-height:110px;background:var(--paper)}
.tool-panel .result{margin-top:12px;background:var(--paper);border:1px solid var(--mist);border-radius:10px;padding:12px;font-size:.95rem;min-height:2.6em;white-space:pre-wrap}
.tool-panel .run{margin-top:12px}

/* ============ LEARN ============ */
.word-day{background:linear-gradient(135deg,var(--cobalt),#4A3ACD);color:#fff;border-radius:var(--radius-lg);padding:28px;display:grid;gap:4px}
.word-day .w{font-family:var(--font-display);font-size:2rem;font-weight:800}
.word-day .m{opacity:.9}
.word-day .e{font-style:italic;opacity:.8;font-size:.92rem}
.word-day button{justify-self:start;margin-top:10px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.4);color:#fff;border-radius:8px;padding:7px 14px;font-size:.85rem}

/* ============ API ============ */
.api-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:26px;align-items:start}
@media(max-width:860px){.api-grid{grid-template-columns:1fr}}
.code{background:#0D162B;color:#D7E3FF;border-radius:var(--radius);padding:20px;font:.8rem/1.7 var(--font-mono);overflow-x:auto;border:1px solid #22335C}
.code .c{color:#6B7FA8}.code .s{color:#8FD6A8}.code .k{color:#8FA6FF}
.api-list{list-style:none;display:grid;gap:10px;margin-top:14px}
.api-list li{display:flex;gap:10px;font-size:.92rem;color:var(--ink-soft)}
.api-list li::before{content:"→";color:var(--cobalt);font-weight:700}

/* ============ FAQ ============ */
details{background:var(--card);border:1px solid var(--mist);border-radius:var(--radius);padding:16px 20px;margin-bottom:10px}
summary{font-weight:600;cursor:pointer;font-size:.98rem}
details p{margin-top:8px;color:var(--ink-soft);font-size:.92rem}

/* ============ FOOTER ============ */
footer{border-top:1px solid var(--mist);padding:44px 0 28px;margin-top:40px;background:var(--card)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}
footer h4{font-family:var(--font-display);font-size:.9rem;margin-bottom:10px}
footer a{display:block;color:var(--ink-soft);text-decoration:none;font-size:.86rem;padding:3px 0}
footer a:hover{color:var(--cobalt)}
.foot-bottom{margin-top:28px;padding-top:18px;border-top:1px solid var(--mist);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.8rem;color:var(--ink-soft)}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--ink);color:var(--paper);padding:10px 22px;border-radius:999px;font-size:.88rem;opacity:0;transition:.3s;z-index:99;box-shadow:var(--shadow)}
.toast.show{opacity:1;transform:translateX(-50%)}

/* ============ SERVER-RENDERED ADDITIONS ============ */
.alert{background:var(--cobalt-soft);border:1px solid var(--cobalt);color:var(--ink);border-radius:var(--radius);padding:12px 16px;margin-bottom:16px;font-size:.9rem}
.alert.error{background:#FDEAEA;border-color:var(--red)}
[data-theme="dark"] .alert.error{background:#3A1D1D}
.prose{max-width:760px}
.prose h2{font-size:1.35rem;margin:26px 0 8px}
.prose p,.prose ul,.prose ol{color:var(--ink-soft);margin-bottom:12px}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-bottom:5px}
.prose code{background:var(--card);border:1px solid var(--mist);border-radius:5px;padding:1px 5px;font-family:var(--font-mono);font-size:.85em}
.prose pre{background:#0D162B;color:#D7E3FF;border-radius:var(--radius);padding:18px;overflow-x:auto;margin-bottom:14px}
.prose pre code{background:none;border:none;color:inherit;padding:0}
.prose strong{color:var(--ink)}
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.post-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.post-grid{grid-template-columns:1fr}}
.post-card{background:var(--card);border:1px solid var(--mist);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:8px;text-decoration:none;color:inherit}
.post-card:hover{border-color:var(--cobalt)}
.post-card .cat{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--cobalt)}
.post-card h3{font-family:var(--font-display);font-size:1.05rem;font-weight:700;line-height:1.3}
.post-card p{font-size:.87rem;color:var(--ink-soft)}
.post-card .meta{font-size:.75rem;color:var(--ink-soft);margin-top:auto;padding-top:8px}
.pagination{display:flex;gap:6px;flex-wrap:wrap;margin-top:26px;list-style:none;font-size:.88rem}
.pagination a,.pagination span{display:inline-block;padding:7px 12px;border:1px solid var(--mist);border-radius:8px;text-decoration:none;color:var(--ink-soft);background:var(--card)}
.pagination .active span{background:var(--cobalt);border-color:var(--cobalt);color:#fff}
.filter-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:18px 0}
.filter-row input,.filter-row select{border:1px solid var(--mist);background:var(--card);color:var(--ink);border-radius:9px;padding:8px 12px;font:.88rem var(--font-body)}
.form-grid{display:grid;gap:14px;max-width:620px}
.form-grid label{font-size:.85rem;font-weight:600;display:block;margin-bottom:4px}
.form-grid input,.form-grid textarea,.form-grid select{width:100%;border:1px solid var(--mist);background:var(--card);color:var(--ink);border-radius:10px;padding:11px 14px;font:.95rem var(--font-body)}
.form-grid textarea{min-height:140px;resize:vertical}
.btn-primary{background:var(--cobalt);border:1px solid var(--cobalt);color:#fff;font-weight:600;border-radius:10px;padding:11px 24px;font-size:.92rem;cursor:pointer;display:inline-block;text-decoration:none}
.btn-primary:hover{filter:brightness(1.08)}
.pairs{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.pairs a{font-size:.82rem;border:1px solid var(--mist);background:var(--card);border-radius:999px;padding:6px 14px;text-decoration:none;color:var(--ink-soft)}
.pairs a:hover{border-color:var(--cobalt);color:var(--cobalt)}