@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

.brand-text { display: grid; line-height: 1.05; }
.brand-text small { color: var(--muted); font: 600 9px var(--font-body); letter-spacing: .03em; margin-top: 5px; }

.topic-image { height: 112px; margin: -21px -21px 18px; border-radius: var(--radius) var(--radius) 0 0; overflow: hidden; position: relative; background: linear-gradient(135deg, #19375e, #7654e8); }
.topic-image img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .4s; }
.topic-card:hover .topic-image img { transform: scale(1.05); }
.topic-image:after { content: ''; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(10,28,55,.55), transparent 65%); pointer-events: none; }
.topic-image span { position: absolute; z-index: 1; right: 14px; bottom: 10px; color: white; font-size: 24px; text-shadow: 0 2px 9px rgba(0,0,0,.5); }
.topic-image.image-fallback { display: grid; place-items: center; }
.topic-image.image-fallback:before { content: '✦'; color: #8be1df; font-size: 35px; }
.topic-image.image-fallback span { display: none; }
.detail-art img { width: 100%; height: 100%; min-height: 180px; display: block; object-fit: cover; }
.detail-art.image-fallback { display: grid; place-items: center; }
.detail-art.image-fallback span { position: static; }
@media (max-width: 620px) { .topic-image { height: 145px; } }

:root { --ink: #14233b; --muted: #65738a; --paper: #f7f9fc; --surface: #fff; --line: #e4eaf2; --navy: #132947; --blue: #2864e9; --cyan: #18b9c4; --violet: #7654e8; --yellow: #f4bd58; --success: #299b72; --shadow: 0 18px 50px rgba(26, 48, 88, .09); --radius: 18px; --font-body: 'DM Sans', sans-serif; --font-display: 'Space Grotesk', sans-serif; }
[data-theme='dark'] { --ink: #f0f5ff; --muted: #9baac0; --paper: #0b1425; --surface: #111e33; --line: #263851; --navy: #e9f2ff; --shadow: 0 18px 50px rgba(0, 0, 0, .25); }
* { box-sizing: border-box; } html { scroll-behavior: smooth; } body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--font-body); line-height: 1.55; } button, input, select { font: inherit; } button { cursor: pointer; } button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible { outline: 3px solid rgba(24, 185, 196, .55); outline-offset: 3px; } .app-shell { min-height: 100vh; overflow: hidden; }
.topbar { height: 78px; max-width: 1240px; margin: auto; padding: 0 28px; display: flex; align-items: center; justify-content: space-between; gap: 20px; } .brand { color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-size: 17px; white-space: nowrap; } .brand strong { font-weight: 700; } .brand-mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 10px; color: white; background: linear-gradient(135deg, var(--blue), var(--violet)); box-shadow: 0 8px 16px rgba(40, 100, 233, .25); } .main-nav { display: flex; gap: 6px; } .nav-link, .text-button { border: 0; background: none; color: var(--muted); font-weight: 600; padding: 9px 12px; border-radius: 10px; } .nav-link:hover, .nav-link.active, .text-button:hover { color: var(--blue); background: rgba(40,100,233,.08); } .top-actions { display: flex; gap: 12px; align-items: center; } .icon-button { border: 1px solid var(--line); background: var(--surface); color: var(--ink); width: 40px; height: 40px; border-radius: 12px; font-size: 19px; } .profile-chip { border: 0; background: none; color: var(--ink); display: flex; gap: 9px; align-items: center; text-align: left; } .avatar { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; color: white; background: var(--navy); } .profile-copy { display: grid; line-height: 1.2; } .profile-copy small { color: var(--muted); font-size: 11px; margin-top: 3px; }
main { max-width: 1240px; margin: auto; padding: 32px 28px 70px; } .view { animation: rise .4s ease both; } [hidden] { display: none !important; } @keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } } .hero-grid { min-height: 485px; border-radius: 28px; padding: 66px 66px 48px; display: grid; grid-template-columns: 1fr .9fr; align-items: center; overflow: hidden; position: relative; background: radial-gradient(circle at 82% 15%, rgba(116, 93, 232, .5), transparent 22%), linear-gradient(125deg, #0c1e38, #142e56 58%, #18254d); color: white; } .hero-grid:after { content: ''; position: absolute; width: 410px; height: 410px; right: -170px; bottom: -220px; border: 1px solid rgba(255,255,255,.12); border-radius: 50%; } .eyebrow { color: var(--cyan); text-transform: uppercase; letter-spacing: .13em; font-size: 11px; font-weight: 700; } .hero-copy { position: relative; z-index: 2; max-width: 600px; } h1, h2, h3 { font-family: var(--font-display); line-height: 1.08; margin: 0; } h1 { font-size: clamp(38px, 5vw, 64px); letter-spacing: -.04em; } h1 em { color: #79e1e0; font-style: normal; } h2 { font-size: 30px; margin-top: 9px; } h3 { font-size: 20px; } .hero-lede { max-width: 480px; color: #c1d0e9; font-size: 17px; margin: 24px 0 30px; } .hero-actions { display: flex; align-items: center; gap: 14px; } .button { border: 0; padding: 12px 17px; border-radius: 11px; font-weight: 700; transition: transform .2s, box-shadow .2s, background .2s; } .button:hover { transform: translateY(-2px); } .button-primary { color: white; background: var(--blue); box-shadow: 0 9px 20px rgba(40, 100, 233, .23); } .button-ghost { color: var(--blue); background: rgba(40, 100, 233, .09); } .hero-grid .button-ghost { color: white; } .hero-copy .text-button { color: #d4e4fc; } .hero-proof { display: flex; align-items: center; gap: 10px; margin-top: 52px; font-size: 12px; } .hero-proof small { display: block; color: #9db0cf; margin-top: 3px; } .proof-avatar { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; color: #7ee6e2; }
.orbit-scene { position: relative; height: 360px; z-index: 1; } .sun { position: absolute; width: 102px; height: 102px; top: 125px; left: 43%; border-radius: 50%; background: radial-gradient(circle at 35% 30%, #fff8ca, #ffc85d 42%, #e78841); box-shadow: 0 0 55px rgba(251, 184, 75, .65); } .orbit { position: absolute; border: 1px solid rgba(147, 212, 230, .28); border-radius: 50%; transform: rotate(-25deg); } .orbit-one { inset: 86px 52px 77px 38px; } .orbit-two { inset: 38px 4px 28px -8px; } .orbit-three { inset: 4px -40px -15px -72px; } .planet { position: absolute; display: block; border-radius: 50%; } .planet-a { width: 17px; height: 17px; background: #6dd6d5; top: 108px; left: 27%; } .planet-b { width: 26px; height: 26px; background: #967ee8; top: 53px; right: 14%; box-shadow: inset -6px -3px rgba(31, 16, 82, .25); } .planet-c { width: 12px; height: 12px; background: #f5c269; bottom: 45px; left: 17%; } .star { position: absolute; color: #add2ff; } .star-a { top: 36px; left: 16%; }.star-b { top: 170px; right: 8%; color: #f1c978; font-size: 25px; }.star-c { bottom: 30px; right: 33%; }
.stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); padding: 25px 22px; margin-bottom: 57px; } .stats-strip div { padding: 0 22px; border-right: 1px solid var(--line); } .stats-strip div:first-child { padding-left: 0; }.stats-strip div:last-child { border: 0; }.stats-strip strong { display: block; font: 700 26px var(--font-display); }.stats-strip span { color: var(--muted); font-size: 12px; }.section-heading, .page-heading { display: flex; justify-content: space-between; align-items: end; gap: 18px; margin-bottom: 25px; } .page-heading { align-items: center; padding: 16px 0 28px; } .page-heading h1 { font-size: 44px; margin: 9px 0; }.page-heading p { color: var(--muted); margin: 0; }.category-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }.category-card { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 15px; padding: 18px; text-align: left; min-height: 125px; transition: transform .2s, box-shadow .2s, border-color .2s; }.category-card:hover { transform: translateY(-4px); border-color: var(--category); box-shadow: var(--shadow); }.category-icon { font-size: 24px; display: block; margin-bottom: 16px; }.category-card b { font: 600 14px var(--font-display); }.category-card small { display: block; color: var(--muted); margin-top: 4px; }.home-lower-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 16px; margin-top: 55px; }.feature-panel { padding: 28px; min-height: 190px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); }.curiosity-panel { color: white; border: 0; background: linear-gradient(120deg, #2557bd, #674fd0); }.curiosity-panel p { color: #d8e3ff; }.panel-label { display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 32px; }.curiosity-panel .panel-label { color: #9fe7e0; }.feature-panel h3 { margin-bottom: 9px; }.feature-panel p { color: var(--muted); font-size: 13px; }.progress-track { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin: 24px 0 10px; }.progress-track span { display: block; height: 100%; width: 0; border-radius: inherit; background: linear-gradient(90deg, var(--cyan), var(--blue)); transition: width .6s ease; }.progress-panel p { display: flex; justify-content: space-between; align-items: center; margin: 0; }
.filters { display: grid; grid-template-columns: 1fr 190px 170px; gap: 12px; align-items: end; background: var(--surface); border: 1px solid var(--line); padding: 14px; border-radius: var(--radius); }.search-box { display: flex; align-items: center; gap: 9px; height: 44px; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 0 12px; color: var(--muted); }.search-box input { flex: 1; min-width: 0; color: var(--ink); background: none; border: 0; outline: 0; }.select-wrap { display: grid; gap: 4px; color: var(--muted); font-size: 11px; font-weight: 700; }.select-wrap select { color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 10px; height: 44px; padding: 0 10px; }.catalog-meta { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 13px; padding: 28px 2px 14px; }.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }.topic-card { min-height: 260px; display: flex; flex-direction: column; padding: 21px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); transition: transform .2s, box-shadow .2s; }.topic-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }.topic-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }.topic-number, .difficulty, .category-pill { font-size: 10px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }.topic-number { color: var(--muted); }.category-pill { color: var(--blue); background: rgba(40,100,233,.09); border-radius: 99px; padding: 5px 8px; }.topic-card h3 { margin: 21px 0 9px; }.topic-card p { color: var(--muted); font-size: 13px; margin: 0; }.topic-footer { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 22px; }.difficulty { color: var(--success); }.difficulty[data-level='Desafío'] { color: var(--violet); }.favorite-button { color: var(--muted); background: none; border: 0; font-size: 21px; }.favorite-button.is-favorite { color: #ef6e8e; }.empty-state { grid-column: 1/-1; padding: 60px 20px; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: var(--radius); }.empty-state h3 { color: var(--ink); margin-bottom: 8px; }
.detail-shell { max-width: 1000px; margin: auto; }.detail-back { display: flex; justify-content: space-between; margin-bottom: 23px; }.detail-hero { display: grid; grid-template-columns: 1fr 270px; gap: 35px; align-items: center; padding: 39px; border-radius: var(--radius); background: linear-gradient(120deg, #112745, #1d3a68); color: white; }.detail-hero h1 { font-size: clamp(35px, 5vw, 52px); margin: 11px 0; }.detail-hero p { color: #c4d4ee; max-width: 620px; }.detail-art { min-height: 180px; border-radius: 18px; background: radial-gradient(circle at 50% 50%, rgba(115,218,217,.35), transparent 25%), linear-gradient(135deg, rgba(40,100,233,.3), rgba(118,84,232,.4)); position: relative; overflow: hidden; }.detail-art:before, .detail-art:after { content: ''; position: absolute; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; inset: 22px; transform: rotate(35deg); }.detail-art:after { inset: 50px -15px; transform: rotate(-25deg); }.detail-art span { position: absolute; top: 75px; left: calc(50% - 24px); width: 48px; height: 48px; border-radius: 50%; background: #fac765; box-shadow: 0 0 30px #fac765; }.detail-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 17px; }.detail-content-grid { display: grid; grid-template-columns: 1.5fr .8fr; gap: 18px; margin-top: 18px; }.content-card { padding: 27px; border: 1px solid var(--line); background: var(--surface); border-radius: var(--radius); }.content-card h2 { font-size: 23px; margin-bottom: 15px; }.content-card p { color: var(--muted); font-size: 14px; }.concepts { display: flex; flex-wrap: wrap; gap: 7px; margin: 16px 0; }.concepts span { color: var(--blue); background: rgba(40,100,233,.1); padding: 6px 9px; border-radius: 7px; font-size: 12px; }.formula-box { padding: 18px; margin-top: 18px; border-left: 3px solid var(--cyan); background: rgba(24,185,196,.08); }.formula { display: block; color: var(--ink); font: 700 25px var(--font-display); margin: 8px 0; }.variable-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }.variable-list div { font-size: 12px; color: var(--muted); }.variable-list b { color: var(--ink); }.callout { border-radius: 14px; padding: 20px; margin-top: 16px; background: #fff5d9; color: #5c481d; }.callout strong { display: block; margin-bottom: 6px; }.callout p { color: inherit; margin: 0; }.dark-callout { background: #162b4c; color: #c8daf6; }.dark-callout p { color: inherit; }.tip-card { background: linear-gradient(145deg, #edf9f7, #f2f1ff); }.tip-card h2 { color: #245d64; }.quiz-card { position: sticky; top: 20px; align-self: start; }.quiz-options { display: grid; gap: 8px; margin-top: 17px; }.quiz-option { color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 11px 13px; text-align: left; }.quiz-option:hover { border-color: var(--blue); }.quiz-option:disabled { cursor: default; opacity: .8; }.quiz-option.correct { border-color: var(--success); color: var(--success); background: rgba(41,155,114,.1); }.quiz-option.wrong { border-color: #e06b76; color: #b8404e; background: rgba(224,107,118,.1); }.quiz-feedback { min-height: 25px; font-size: 13px; margin: 14px 0 0; }.quiz-feedback.correct { color: var(--success); }.quiz-feedback.wrong { color: #b8404e; }.detail-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 20px; }.detail-nav .button { flex: 1; }.detail-nav .button:last-child { text-align: right; }
.classroom-grid, .surprise-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }.classroom-card, .surprise-card { border: 1px solid var(--line); background: var(--surface); border-radius: var(--radius); padding: 25px; }.classroom-card h3, .surprise-card h3 { margin: 10px 0 15px; }.classroom-card p, .surprise-card p { color: var(--muted); font-size: 14px; }.classroom-card .classroom-label { color: var(--violet); text-transform: uppercase; font-size: 10px; font-weight: 700; letter-spacing: .1em; }.progress-overview { display: grid; grid-template-columns: 1.1fr 1fr; gap: 16px; margin-bottom: 16px; }.big-progress, .badges-panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }.big-percent { display: block; font: 700 55px var(--font-display); color: var(--blue); }.big-progress .progress-track { height: 11px; }.level-box { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); margin-top: 24px; padding-top: 18px; }.level-box p { margin: 0; color: var(--muted); font-size: 13px; }.badges-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }.badge-item { border: 1px solid var(--line); border-radius: 12px; padding: 13px; text-align: center; color: var(--muted); opacity: .48; }.badge-item.unlocked { opacity: 1; color: var(--ink); border-color: rgba(244,189,88,.55); background: rgba(244,189,88,.1); }.badge-item span { display: block; font-size: 24px; margin-bottom: 5px; }.badge-item b { display: block; font-size: 11px; }.badge-item small { font-size: 10px; }
.footer { max-width: 1240px; margin: auto; padding: 25px 28px; display: flex; justify-content: space-between; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }.toast { position: fixed; right: 24px; bottom: 24px; z-index: 10; padding: 13px 17px; border-radius: 10px; background: var(--navy); color: var(--paper); box-shadow: var(--shadow); opacity: 0; transform: translateY(14px); pointer-events: none; transition: .25s; font-size: 13px; }.toast.show { opacity: 1; transform: none; }
@media (max-width: 900px) { .main-nav { display: none; }.hero-grid { grid-template-columns: 1.2fr .8fr; padding: 43px; }.category-grid { grid-template-columns: repeat(3, 1fr); }.topic-grid { grid-template-columns: repeat(2, 1fr); }.detail-content-grid { grid-template-columns: 1fr; }.quiz-card { position: static; }.progress-overview { grid-template-columns: 1fr; } }
@media (max-width: 620px) { .topbar { height: 68px; padding: 0 17px; }.profile-copy { display: none; } main { padding: 18px 17px 45px; }.hero-grid { display: block; min-height: 0; padding: 35px 25px 22px; }.hero-lede { font-size: 15px; }.hero-proof { margin-top: 32px; }.orbit-scene { height: 230px; margin-top: 10px; transform: scale(.82); transform-origin: center; }.stats-strip { grid-template-columns: repeat(2, 1fr); gap: 20px 0; margin-bottom: 40px; padding: 20px 0; }.stats-strip div { padding: 0 15px; }.stats-strip div:nth-child(3) { padding-left: 0; }.stats-strip div:nth-child(2) { border: 0; }.section-heading, .page-heading { align-items: flex-start; flex-direction: column; }.page-heading h1 { font-size: 35px; }.category-grid, .topic-grid, .classroom-grid, .surprise-grid, .home-lower-grid { grid-template-columns: 1fr; }.filters { grid-template-columns: 1fr; }.detail-hero { grid-template-columns: 1fr; padding: 25px; }.detail-art { min-height: 130px; }.detail-content-grid { gap: 12px; }.content-card { padding: 20px; }.variable-list { grid-template-columns: 1fr; }.footer { flex-direction: column; gap: 8px; padding: 20px 17px; }.badges-grid { grid-template-columns: repeat(2, 1fr); }.hero-actions { align-items: flex-start; flex-direction: column; }.hero-actions .text-button { padding-left: 0; } }
@media (prefers-reduced-motion: reduce) { *, *:before, *:after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; } }