:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:#22253a;background:#fbfbfe;font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.shell{width:min(1100px,calc(100% - 40px));margin:auto}.header{background:#fff;border-bottom:1px solid #eaeaf3;position:sticky;top:0;z-index:5}.nav{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{font-weight:850;font-size:21px;letter-spacing:-.8px}.brand span:last-child{color:#7355d7}.brand-mark{color:#7355d7;margin-right:6px}.nav nav{display:flex;gap:32px;color:#606378;font-size:14px}.nav nav a:hover{color:#7355d7}.hero{text-align:center;padding:103px 0 96px}.eyebrow{font-size:11px;letter-spacing:1.9px;color:#795bdc;font-weight:800}.hero h1{font-size:clamp(43px,6vw,70px);line-height:1.09;letter-spacing:-3.5px;margin:23px auto 20px;max-width:850px}.hero h1 span{color:#7658df}.hero>p{color:#74778a;font-size:18px;line-height:1.75;max-width:600px;margin:0 auto}.hero-actions{display:flex;justify-content:center;gap:12px;margin-top:31px}.btn{display:inline-flex;align-items:center;gap:20px;border-radius:11px;padding:15px 23px;font-weight:700;font-size:14px}.primary{background:#7658df;color:white;box-shadow:0 8px 20px #7658df2a}.primary:hover{background:#6042c8}.ghost{border:1px solid #e4e4ee;background:white}.trust{color:#9294a4;font-size:12px;margin-top:28px}.section{padding:35px 0 74px;scroll-margin-top:90px}.section h2,.about h2{font-size:clamp(28px,4vw,39px);letter-spacing:-1.4px;margin:11px 0}.section>p,.section-top p,.about p{color:#85879a;line-height:1.7}.tools{display:grid;grid-template-columns:repeat(3,1fr);gap:17px;margin-top:30px}.tool{position:relative;border:1px solid #e9e9f2;background:#fff;border-radius:17px;padding:25px;min-height:225px;transition:transform .2s,border-color .2s}.tool.live:hover{transform:translateY(-3px);border-color:#ac99f0}.tool-icon{display:flex;align-items:center;justify-content:center;width:47px;height:47px;border-radius:13px;background:#f1edff;color:#7453d6;font-size:25px;margin-bottom:20px}.status{position:absolute;right:17px;top:22px;color:#9698a8;background:#f4f4f8;border-radius:20px;padding:6px 9px;font-size:9px;font-weight:800;letter-spacing:.6px}.status.active{background:#e8f8ee;color:#26884d}.tool h3{font-size:17px;margin:0 0 10px}.tool p{color:#898b9d;font-size:13px;line-height:1.65;margin:0}.tool-link{display:block;color:#7455d7;font-size:12px;font-weight:800;margin-top:18px}.calculator{display:grid;grid-template-columns:1.6fr 1fr;gap:0;border:1px solid #e9e9f2;background:white;border-radius:20px;overflow:hidden;margin-top:29px;box-shadow:0 10px 35px #28284e08}.calc-main{padding:29px}.calc-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:23px}.calc-heading h3{margin:0;font-size:19px}.subtle-button{border:0;background:none;color:#8466da;font-size:12px;font-weight:700}.column-labels,.grade-row{display:grid;grid-template-columns:minmax(100px,1fr) 90px 105px 28px;gap:10px;align-items:center}.column-labels{color:#999aaa;font-size:11px;margin-bottom:9px}.grade-row{margin-bottom:11px}.grade-row input,.calc-settings input{width:100%;min-width:0;border:1px solid #e6e6ef;background:#fcfcff;border-radius:9px;padding:11px 10px;outline:0;font-size:13px}.grade-row input:focus,.calc-settings input:focus{border-color:#7658df;box-shadow:0 0 0 3px #7658df16}.remove{border:0;background:none;color:#a3a3b1;font-size:21px}.remove:hover{color:#c23f5d}.add-button{border:1px dashed #b9a9eb;background:#faf8ff;color:#7353d6;border-radius:9px;padding:12px 16px;width:100%;margin:7px 0 20px;font-size:13px;font-weight:700}.calc-settings{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding-top:20px;border-top:1px solid #eeeef5}.calc-settings label{display:block;font-size:12px;font-weight:650;color:#626579}.calc-settings input{display:block;margin-top:9px}.help{font-size:11px;color:#9a9bab;line-height:1.7;margin:19px 0 0}.results{background:#f6f3ff;padding:34px 29px}.result-label{font-size:10px;letter-spacing:1.1px;color:#77728c;font-weight:800}.big-number{font-size:72px;letter-spacing:-3px;font-weight:850;color:#6e50d3;margin:7px 0}.results p{font-size:12px;line-height:1.6;color:#858098;margin:0}.result-divider{border-top:1px solid #e3ddf6;margin:32px 0}.needed{font-size:46px;font-weight:800;color:#29233d;margin:12px 0}.feedback{font-size:12px;font-weight:650;line-height:1.6;margin-top:25px}.feedback.warning{color:#9a5712}.feedback.success{color:#24804d}.about{text-align:center;background:#f6f4ff;border-radius:22px;padding:60px 25px;margin-top:15px;margin-bottom:75px}.about p{max-width:620px;margin:15px auto 0}footer{border-top:1px solid #ededf4;background:white}.footer-inner{display:flex;align-items:center;justify-content:space-between;min-height:85px;color:#999aaa;font-size:12px}.footer-inner .brand{color:#28263a;font-size:17px}@media(max-width:850px){.tools{grid-template-columns:repeat(2,1fr)}.calculator{grid-template-columns:1fr}.results{border-top:1px solid #e9e2fa}.hero{padding:76px 0}.hero h1{letter-spacing:-2px}}@media(max-width:550px){.shell{width:min(100% - 28px,1100px)}.nav{height:65px}.nav nav{gap:13px;font-size:11px}.nav nav a:last-child{display:none}.brand{font-size:18px}.hero{padding:68px 0}.hero>p{font-size:15px}.hero-actions{flex-wrap:wrap}.tools{grid-template-columns:1fr}.tool{min-height:190px}.calc-main,.results{padding:20px 14px}.column-labels,.grade-row{grid-template-columns:minmax(80px,1fr) 67px 73px 20px;gap:6px}.grade-row input{padding:10px 6px}.calc-settings{grid-template-columns:1fr}.footer-inner{gap:10px;flex-wrap:wrap;padding:18px 0}.section{padding-bottom:45px}}

/* v0.2: temas accesibles y nuevos controles */
:root{color-scheme:light;--page:#fbfbfe;--surface:#fff;--surface-soft:#fcfcff;--ink:#22253a;--muted:#74778a;--border:#e9e9f2;--accent:#7355d7;--accent-soft:#f1edff;--result-bg:#f6f3ff;--result-border:#e3ddf6;--hover:#faf8ff;--positive:#26884d;--positive-bg:#e8f8ee;--tag:#f4f4f8;--shadow:#28284e08}
:root[data-theme=dark]{color-scheme:dark;--page:#10121b;--surface:#1a1d2a;--surface-soft:#222637;--ink:#f1f0fa;--muted:#afb2c7;--border:#34374b;--accent:#ad94ff;--accent-soft:#33294d;--result-bg:#242037;--result-border:#44375e;--hover:#2c2444;--positive:#7bdba5;--positive-bg:#193f32;--tag:#303346;--shadow:#0003}
body{background:var(--page);color:var(--ink)}.header,footer,.tool,.calculator,.ghost{background:var(--surface);border-color:var(--border)}.nav nav,.hero>p,.section>p,.section-top p,.about p,.tool p,.results p,.help,.footer-inner,.column-labels{color:var(--muted)}.brand span:last-child,.brand-mark,.hero h1 span,.eyebrow,.tool-link,.subtle-button{color:var(--accent)}.tool{box-shadow:0 3px 12px var(--shadow)}.tool-icon{background:var(--accent-soft);color:var(--accent)}.status{background:var(--tag);color:var(--muted)}.status.active{background:var(--positive-bg);color:var(--positive)}.calculator{box-shadow:0 10px 35px var(--shadow)}.grade-row input,.calc-settings input{background:var(--surface-soft);border-color:var(--border);color:var(--ink)}.grade-row input:focus,.calc-settings input:focus{border-color:var(--accent)}.calc-settings{border-color:var(--border)}.calc-settings label{color:var(--muted)}.add-button{background:var(--hover);color:var(--accent);border-color:var(--accent)}.results,.about{background:var(--result-bg)}.result-label{color:var(--muted)}.big-number{color:var(--accent)}.needed{color:var(--ink)}.result-divider{border-color:var(--result-border)}.footer-inner .brand{color:var(--ink)}.feedback.warning{color:#df9447}.feedback.success{color:var(--positive)}.theme-toggle{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--surface-soft);color:var(--ink);padding:9px 12px;border-radius:11px;font-size:13px;font-weight:700;white-space:nowrap}.theme-toggle:hover{border-color:var(--accent)}.nav{gap:15px}.nav nav{margin-left:auto}.mode-switch{display:flex;gap:5px;background:var(--surface-soft);border:1px solid var(--border);padding:5px;border-radius:12px;margin-bottom:22px}.mode-btn{flex:1;background:transparent;border:0;border-radius:8px;padding:10px 6px;color:var(--muted);font-size:12px;font-weight:750}.mode-btn.active{background:var(--accent-soft);color:var(--accent)}.progress-wrap{margin-top:20px}.progress-top{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:8px}.progress-track{height:8px;border-radius:99px;background:var(--border);overflow:hidden}.progress-track>div{height:100%;width:0%;background:var(--accent);border-radius:99px;transition:width .2s}.calc-settings.is-average{grid-template-columns:1fr}.calc-settings.is-average label:last-child{display:none}button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}@media(max-width:550px){.nav nav{gap:10px}.nav nav a:first-child{display:none}.theme-toggle{padding:8px}.theme-toggle span{display:none}.calc-settings.is-average{grid-template-columns:1fr}}

/* v0.3 PDF tools */
.pdf-page{padding-top:52px;padding-bottom:85px;max-width:880px}.back-link{display:inline-block;color:var(--accent);font-weight:700;font-size:13px;margin-bottom:38px}.pdf-page h1{font-size:clamp(36px,6vw,56px);letter-spacing:-2px;margin:12px 0}.pdf-intro{color:var(--muted);line-height:1.7;margin-bottom:30px}.pdf-panel{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:28px;box-shadow:0 10px 35px var(--shadow)}.upload-area{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;min-height:170px;border:2px dashed var(--accent);border-radius:14px;background:var(--hover);text-align:center;padding:20px;cursor:pointer}.upload-area strong{font-size:18px}.upload-area span,.hint-text{font-size:13px;color:var(--muted);line-height:1.5}.upload-area input{width:100%;max-width:310px;color:var(--muted);font-size:12px}.file-list{margin:18px 0}.file-item{display:flex;align-items:center;gap:10px;padding:12px;border-bottom:1px solid var(--border)}.file-item span{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.file-item small{color:var(--muted);white-space:nowrap}.file-item button{border:1px solid var(--border);background:var(--surface-soft);color:var(--ink);border-radius:7px;min-width:30px;min-height:30px}.file-item button:disabled{opacity:.35}.process-btn{border:0;justify-content:center;width:100%;margin-top:12px}.process-btn:disabled{opacity:.45;cursor:not-allowed}.pdf-status{color:var(--muted);font-size:13px;margin-top:17px;line-height:1.5}.pdf-status.error{color:#d87d43}.range-label{display:block;font-weight:700;font-size:13px;margin-top:20px}.range-label input{display:block;width:100%;background:var(--surface-soft);color:var(--ink);border:1px solid var(--border);border-radius:9px;padding:13px;margin-top:9px}.pdf-guide{margin-top:42px;color:var(--muted);line-height:1.8;font-size:14px}.pdf-guide h2{color:var(--ink)}.pdf-guide li{margin:8px 0}@media(max-width:550px){.pdf-page{padding-top:32px}.pdf-panel{padding:16px}.file-item{gap:5px}.file-item small{font-size:10px}}

.footer-privacy{color:inherit;text-decoration:underline;text-underline-offset:3px;margin-left:12px}.drop-hint{font-size:.85rem;color:var(--muted,#777)}.upload-area.drag-active{outline:3px solid #7654e8;outline-offset:3px;background:rgba(118,84,232,.08)}:focus-visible{outline:3px solid #7654e8;outline-offset:3px}

/* v0.5: accessibility, mobile and drag/drop */
.skip-link{position:absolute;left:12px;top:-90px;z-index:100;background:var(--surface);color:var(--ink);padding:12px;border-radius:8px}.skip-link:focus{top:12px}
html{scroll-padding-top:85px}body{overflow-wrap:break-word}button,input{touch-action:manipulation}button:disabled{cursor:not-allowed}
.upload-area.drag-active{background:var(--accent-soft);outline:3px solid var(--accent);outline-offset:2px}
.file-item{flex-wrap:wrap}.file-item span{overflow-wrap:anywhere}.file-item button{min-width:36px;min-height:36px}
@media(max-width:550px){.nav{gap:8px}.brand{font-size:17px}.nav nav{font-size:12px}.hero h1{letter-spacing:-1.6px}.big-number{font-size:clamp(44px,14vw,72px)}.needed{font-size:clamp(29px,9vw,46px)}.grade-row{grid-template-columns:minmax(75px,1fr) minmax(55px,67px) minmax(60px,73px) 24px}.grade-row input{font-size:16px}.file-item span{flex-basis:100%}.file-item small{margin-right:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

/* Feedback: controles fluidos y accesibles */
.feedback-form{display:grid;gap:12px;max-width:650px;margin:26px 0 32px}.feedback-form label{font-weight:650}.feedback-form input,.feedback-form select,.feedback-form textarea{width:100%;max-width:100%;min-width:0;padding:13px 14px;border:1px solid var(--border,#cbd5e1);border-radius:12px;background:var(--card,var(--surface,#fff));color:inherit;font:inherit}.feedback-form textarea{resize:vertical}.feedback-form :is(input,select,textarea,button):focus-visible{outline:3px solid #8b5cf6;outline-offset:2px}.feedback-form .help{font-size:.9rem;line-height:1.6}.feedback-form button{justify-self:start;cursor:pointer}@media(max-width:600px){.feedback-form button{width:100%}.feedback-form{gap:10px}}

/* v0.6.1: mobile navigation, dialog, and theme consistency */
@media(max-width:550px){.nav{height:auto;min-height:66px;flex-wrap:wrap;padding:12px 0;row-gap:12px}.nav nav{display:flex;order:3;width:100%;margin:0;justify-content:space-between;gap:10px;overflow-x:auto;white-space:nowrap;padding-bottom:4px}.nav nav a:first-child,.nav nav a:last-child{display:inline}.nav nav a{font-size:12px}.theme-toggle{margin-left:auto}.header{position:relative}.section{scroll-margin-top:16px}}
.confirm-dialog{width:min(420px,calc(100vw - 32px));border:1px solid var(--border);border-radius:18px;background:var(--surface);color:var(--ink);padding:26px;box-shadow:0 24px 70px #0004}.confirm-dialog::backdrop{background:#080a16a6;backdrop-filter:blur(3px)}.confirm-dialog h3{margin:0 0 12px;font-size:21px}.confirm-dialog p{color:var(--muted);line-height:1.5}.dialog-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}.dialog-actions .btn{border:1px solid var(--border);justify-content:center}.dialog-actions .primary{border-color:transparent}@media(max-width:400px){.dialog-actions{flex-direction:column-reverse}.dialog-actions .btn{width:100%}}


/* v0.6.5 — Legibilidad y contraste: preservar estética y temas */
:root{--muted:#55586b;--accent:#6042bd;--positive:#176337}
:root[data-theme=dark]{--muted:#c6c8d8;--accent:#c2afff;--positive:#93e5b5}
:root:not([data-theme=dark]) .trust,
:root:not([data-theme=dark]) .column-labels,
:root:not([data-theme=dark]) .help,
:root:not([data-theme=dark]) .results p,
:root:not([data-theme=dark]) .result-label,
:root:not([data-theme=dark]) .footer-inner,
:root:not([data-theme=dark]) .status,
:root:not([data-theme=dark]) .tool p,
:root:not([data-theme=dark]) .nav nav,
:root:not([data-theme=dark]) .hero>p,
:root:not([data-theme=dark]) .section>p,
:root:not([data-theme=dark]) .section-top p,
:root:not([data-theme=dark]) .about p{color:var(--muted)}
:root:not([data-theme=dark]) .status.active{color:var(--positive)}
:root:not([data-theme=dark]) .status{color:#535569}
:root:not([data-theme=dark]) .result-label{color:#555269}
:root:not([data-theme=dark]) .big-number{color:#6042bd}
:root:not([data-theme=dark]) .subtle-button,
:root:not([data-theme=dark]) .tool-link,
:root:not([data-theme=dark]) .back-link{color:var(--accent)}
:root:not([data-theme=dark]) .primary{background:#6042bd;color:#fff}
:root:not([data-theme=dark]) .feedback.success{color:#176337}