/* Examen · Native Language — sistema de diseño oficial Native Language */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;800;900&display=swap');

:root {
  /* Native Language brand tokens (see native-language-brand/assets/brand.css) */
  --nl-near-black: #050708; --nl-ink: #121C1E; --nl-deep-slate: #1C2B2D;
  --nl-off-white: #F7F7F3; --nl-cloud: #F0F0F0; --nl-mid-gray: #89918D; --nl-light-gray: #CED4D1;
  --nl-bright-green: #55D27D; --nl-emerald: #1E7842; --nl-forest: #16302A; --nl-mint: #7EE8A6;
  --nl-font: 'Inter', 'Montserrat', 'Poppins', Arial, sans-serif;

  /* Mapped from the app's original design-system variable names, so every
     existing component keeps working unchanged. One signature green accent
     (bright green) replaces the old two-tone teal+coral system. */
  --ink: var(--nl-near-black); --ink-2: var(--nl-ink);
  --teal: var(--nl-emerald); --teal-2: var(--nl-bright-green); --teal-soft: #EAF3EC;
  --coral: var(--nl-bright-green); --coral-dark: var(--nl-emerald); --coral-soft: #E4F9EC;
  --cream: var(--nl-off-white); --paper: #fff;
  --line: var(--nl-light-gray); --muted: #5B6461;
  --green: var(--nl-emerald); --green-soft: #E4F3E9;
  --amber: #C25E1A; --amber-soft: #FBEEE3;
  --red: #B3391F; --red-soft: #FBE9E4;
  --shadow: 0 20px 50px rgba(5, 7, 8, .14); --shadow-sm: 0 8px 24px rgba(5, 7, 8, .10);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--nl-font);
  font-weight: 400;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.5;
}
h1, h2, h3, h4 { font-family: var(--nl-font); font-weight: 800; letter-spacing: -0.01em; }
img { max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: 10px 16px; z-index: 100; }
.skip-link:focus { left: 0; }

.app-loading { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; color: var(--muted); text-align: center; padding: 24px; }
.loading-mark { display: flex; gap: 8px; }
.loading-mark span { width: 12px; height: 12px; border-radius: 50%; background: var(--teal); animation: bounce 1.1s infinite ease-in-out; }
.loading-mark span:nth-child(2) { animation-delay: .15s; background: var(--coral); }
.loading-mark span:nth-child(3) { animation-delay: .3s; background: var(--teal-2); }
.loading-mark span:nth-child(4) { animation-delay: .45s; background: var(--green); }
@keyframes bounce { 0%, 80%, 100% { transform: translateY(0); opacity: .5; } 40% { transform: translateY(-10px); opacity: 1; } }

.eyebrow { display: inline-block; font-family: var(--nl-font); font-size: 12px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--teal); margin-bottom: 8px; }

.button { display: inline-flex; align-items: center; gap: 8px; border: none; border-radius: 999px; padding: 12px 22px; font-family: var(--nl-font); font-weight: 700; font-size: 14px; transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease; }
.button.primary { background: var(--coral-dark); color: #fff; box-shadow: var(--shadow-sm); }
.button.primary:hover { background: var(--nl-forest); transform: translateY(-1px); box-shadow: var(--shadow); }
.button.secondary { background: var(--teal-soft); color: var(--ink-2); }
.button.secondary:hover { background: var(--coral-soft); }
.button.ghost { background: transparent; color: var(--ink-2); border: 1px solid var(--line); }
.button.ghost:hover { border-color: var(--teal); color: var(--teal); }
.button.small { padding: 8px 16px; font-size: 13px; }

.toast-stack { position: fixed; bottom: 20px; right: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 200; }
.toast { background: var(--nl-near-black); color: #fff; padding: 12px 18px; border-radius: 12px; box-shadow: var(--shadow); font-size: 14px; }
.toast.error { background: var(--amber); }

.app-shell { min-height: 100vh; display: flex; flex-direction: column; }

.top-header { display: flex; align-items: center; gap: 20px; padding: 16px 28px; background: var(--nl-near-black); border-bottom: 1px solid var(--nl-deep-slate); position: sticky; top: 0; z-index: 20; flex-wrap: wrap; }
.brand-lockup { display: flex; align-items: center; gap: 12px; }
.brand-lockup img { width: 40px; height: 40px; object-fit: contain; }
.brand-lockup b { display: block; font-family: var(--nl-font); font-weight: 800; font-size: 16px; color: #fff; }
.brand-lockup small { color: var(--nl-mid-gray); font-size: 10px; letter-spacing: .08em; }
.top-nav { display: flex; gap: 6px; margin-left: auto; }
.top-nav button { background: transparent; border: none; padding: 10px 16px; border-radius: 999px; font-family: var(--nl-font); font-weight: 600; color: var(--nl-light-gray); }
.top-nav button.active, .top-nav button:hover { background: var(--nl-ink); color: var(--nl-bright-green); }
.progress-chip { background: var(--nl-ink); color: var(--nl-bright-green); border-radius: 14px; padding: 8px 14px; text-align: center; line-height: 1.2; }
.progress-chip span { display: block; font-weight: 800; }
.progress-chip small { font-size: 10px; color: var(--nl-mid-gray); }

.page { max-width: 1180px; margin: 0 auto; padding: 32px 24px 60px; width: 100%; flex: 1; }

.hero { background: linear-gradient(135deg, var(--nl-near-black) 0%, var(--nl-ink) 55%, var(--nl-forest) 130%); color: #fff; border-radius: 24px; padding: 40px; margin-bottom: 40px; box-shadow: var(--shadow); }
.hero .eyebrow { color: var(--teal-2); }
.hero h1 { font-family: var(--nl-font); font-weight: 900; letter-spacing: -0.02em; font-size: clamp(26px, 4vw, 38px); line-height: 1.15; margin: 0 0 14px; max-width: 760px; }
.hero p { color: rgba(255,255,255,.85); max-width: 640px; margin: 0 0 22px; }
.hero-progress { display: flex; flex-direction: column; gap: 10px; max-width: 460px; }
.hero-progress span { font-size: 13px; color: rgba(255,255,255,.8); }

.progress-track { height: 8px; border-radius: 999px; background: rgba(5,7,8,.08); overflow: hidden; }
.progress-track.big { height: 12px; background: rgba(255,255,255,.18); }
.progress-track i { display: block; height: 100%; background: var(--coral); border-radius: 999px; transition: width .3s ease; }

.section-block { margin-bottom: 44px; }
.section-head { margin-bottom: 18px; display: flex; flex-direction: column; gap: 4px; }
.section-head h2 { margin: 0; font-family: var(--nl-font); font-weight: 800; font-size: 22px; }
.section-head p { margin: 0; color: var(--muted); }

.situation-grid { display: grid; gap: 18px; }
.situation-grid.core { grid-template-columns: repeat(2, 1fr); }
.situation-grid.bonus { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .situation-grid.core, .situation-grid.bonus { grid-template-columns: 1fr; } }

.situation-card { position: relative; text-align: left; background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 24px; display: flex; flex-direction: column; gap: 14px; box-shadow: var(--shadow-sm); transition: transform .15s ease, box-shadow .15s ease; }
.situation-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.situation-card.big { padding: 28px; }
.situation-icon { font-size: 34px; }
.situation-copy h3 { margin: 0 0 6px; font-size: 19px; }
.situation-copy p { margin: 0; color: var(--muted); font-size: 14px; }
.situation-progress small { color: var(--muted); font-size: 12px; }

.page-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: 28px; }
.page-head h1 { margin: 6px 0; font-size: 28px; }
.page-head p { margin: 0; color: var(--muted); max-width: 720px; }
.page-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.dialogue-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.dialogue-card { text-align: left; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 20px; display: flex; flex-direction: column; gap: 10px; box-shadow: var(--shadow-sm); }
.dialogue-card:hover { border-color: var(--teal-2); }
.dialogue-card h3 { margin: 0; font-size: 17px; }
.dialogue-card p { margin: 0; color: var(--muted); font-size: 13px; flex: 1; }
.dialogue-status { font-weight: 700; font-size: 13px; color: var(--teal); }

.speech-slot:empty { display: none; }
.speech-lab { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; box-shadow: var(--shadow-sm); margin-top: 14px; }
.speech-target { padding: 22px; background: var(--ink-2); color: #fff; }
.speech-control { padding: 20px 22px; display: grid; grid-template-columns: 100px 1fr; gap: 20px; align-items: center; }
.record-button { width: 90px; height: 90px; border-radius: 50%; border: 8px solid var(--coral-soft); background: var(--coral-dark); color: #fff; display: grid; place-items: center; cursor: pointer; box-shadow: 0 10px 24px rgba(30,120,66,.28); font-weight: 800; font-size: 12px; text-align: center; line-height: 1.3; }
.record-button.recording { animation: recordPulse 1s infinite alternate; background: var(--red); border-color: var(--red-soft); }
@keyframes recordPulse { to { box-shadow: 0 0 0 16px rgba(85,210,125,.20); } }
.speech-control h3 { margin: 0 0 6px; font-size: 15px; }
.speech-control p { color: var(--muted); margin: 0; font-size: 13px; }
.speech-result-box:empty { display: none; }
.speech-results { border-top: 1px solid var(--line); padding: 20px 22px; display: flex; flex-direction: column; gap: 12px; }
.own-recording { display: flex; flex-direction: column; gap: 6px; }
.own-recording small, .speech-transcript small { color: var(--muted); font-weight: 800; letter-spacing: .08em; font-size: 10px; text-transform: uppercase; }
.own-recording audio { width: 100%; }
.speech-transcript p { margin: 4px 0 0; font-style: italic; }
.match-score { display: flex; align-items: baseline; gap: 8px; background: var(--cream); border-radius: 12px; padding: 10px 14px; width: fit-content; }
.match-score strong { font-size: 22px; }
.match-score span { color: var(--muted); font-size: 12px; }
.match-score.good strong { color: var(--green); }
.match-score.retry strong { color: var(--amber); }
.speech-note { margin: 0; color: var(--muted); font-size: 12px; }
.speech-disclaimer { color: var(--muted); font-size: 11px; }

.alert { padding: 12px 14px; border-radius: 12px; margin: 12px 0 0; line-height: 1.5; font-size: 13px; }
.alert.error { background: var(--red-soft); color: var(--red); border: 1px solid #f0cdc3; }
.alert.info { background: var(--teal-soft); color: var(--ink-2); border: 1px solid var(--line); }
.alert.warning { background: var(--amber-soft); color: var(--amber); border: 1px solid #f0d2b8; }

@media (max-width: 640px) {
  .speech-control { grid-template-columns: 1fr; text-align: center; }
  .record-button { margin: auto; }
  .match-score { margin: auto; }
}

.trap-card { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 16px; margin-bottom: 12px; box-shadow: var(--shadow-sm); }
.wrong-right { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.contrast { border-radius: 12px; padding: 10px 14px; }
.contrast.wrong { background: var(--red-soft); color: var(--red); }
.contrast.right { background: var(--green-soft); color: var(--green); }
.contrast small { display: block; font-size: 10px; font-weight: 800; letter-spacing: .06em; margin-bottom: 4px; }
.trap-why { margin: 0; font-size: 13px; color: var(--ink-2); }

.empty-state { text-align: center; padding: 60px 20px; background: var(--paper); border: 1px dashed var(--line); border-radius: 20px; color: var(--muted); }
.empty-state h2 { color: var(--ink); }

.exercise-panel { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow-sm); overflow: hidden; }
.exercise-steps { display: flex; flex-wrap: wrap; gap: 6px; padding: 16px 20px; border-bottom: 1px solid var(--line); background: var(--nl-cloud); border-radius: 16px; }
.exercise-step { font-size: 11px; font-weight: 700; letter-spacing: .02em; padding: 6px 10px; border-radius: 999px; background: #fff; color: var(--muted); border: 1px solid var(--line); }
.exercise-step.active { background: var(--ink-2); color: #fff; border-color: var(--ink-2); }
.exercise-step.done { color: var(--green); border-color: var(--green); }
.exercise-body { padding: 28px; display: flex; flex-direction: column; gap: 16px; }

.exercise-text-input { width: 100%; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line); font-family: var(--nl-font); font-size: 15px; resize: vertical; }
.exercise-text-input:focus { outline: 2px solid var(--teal-2); outline-offset: 1px; }

.option-grid { display: flex; flex-direction: column; gap: 10px; }
.option-button { justify-content: flex-start; text-align: left; width: 100%; }
.option-button.option-correct { border-color: var(--green); background: var(--green-soft); color: var(--green); }
.option-button.option-wrong { border-color: var(--red); background: var(--red-soft); color: var(--red); }
.option-button.option-selected { border-color: var(--teal-2); background: var(--teal-soft); color: var(--ink-2); }

.exercise-summary { display: flex; flex-direction: column; gap: 14px; align-items: flex-start; }
.summary-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; width: 100%; }
.summary-list li { display: flex; justify-content: space-between; padding: 10px 14px; background: var(--nl-cloud); border-radius: 10px; font-size: 14px; }

.site-footer { display: flex; justify-content: space-between; padding: 18px 28px; color: var(--muted); font-size: 12px; border-top: 1px solid var(--line); flex-wrap: wrap; gap: 8px; }

@media (max-width: 640px) {
  .top-header { padding: 12px 16px; }
  .top-nav { width: 100%; justify-content: space-between; order: 3; margin-left: 0; }
  .page { padding: 20px 16px 40px; }
  .hero { padding: 26px; }
}

/* --- Examen: bloques, cronómetro, audio, preguntas de opción múltiple, tablas de datos, rúbricas, gramática --- */

.exam-panel { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow-sm); padding: 24px; margin-bottom: 22px; }
.exam-panel h2 { margin: 0 0 14px; font-size: 20px; }

.exam-timer { display: inline-flex; align-self: flex-start; background: var(--nl-ink); color: var(--nl-bright-green); font-weight: 800; padding: 8px 16px; border-radius: 999px; font-size: 14px; letter-spacing: .02em; }
.exam-timer.exam-timer-done { background: var(--amber-soft); color: var(--amber); }

.reading-text { background: var(--nl-cloud); border-radius: 14px; padding: 18px 20px; margin-bottom: 18px; }
.reading-text p { margin: 0 0 12px; line-height: 1.7; }
.reading-text p:last-child { margin-bottom: 0; }

.mc-list { display: flex; flex-direction: column; gap: 20px; }
.mc-question { border-top: 1px solid var(--line); padding-top: 16px; }
.mc-question:first-child { border-top: none; padding-top: 0; }
.mc-enunciado { font-weight: 700; margin: 0 0 10px; }
.mc-review .option-button { cursor: default; }

.exam-audio { width: 100%; margin-bottom: 12px; border-radius: 999px; }
.transcript-toggle { background: var(--nl-cloud); border-radius: 12px; padding: 12px 16px; margin-bottom: 18px; }
.transcript-toggle summary { cursor: pointer; font-weight: 700; font-size: 13px; color: var(--teal); }
.transcript-toggle p { margin: 10px 0; color: var(--ink-2); font-size: 14px; line-height: 1.6; }

.word-counter { margin: 8px 0 0; font-size: 12px; color: var(--muted); font-weight: 700; }
.word-counter-ok { color: var(--green); }

.data-table-wrap { overflow-x: auto; margin: 14px 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th, .data-table td { border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.data-table th { background: var(--nl-ink); color: #fff; font-weight: 700; }
.data-table tr:nth-child(even) td { background: var(--nl-cloud); }

.d2-questions { margin: 0 0 14px; padding-left: 20px; }
.d2-questions li { margin-bottom: 8px; }

.rubrica-grid { display: flex; flex-direction: column; gap: 18px; margin-top: 14px; }
.rubrica-row { border-top: 1px solid var(--line); padding-top: 14px; }
.rubrica-row:first-child { border-top: none; padding-top: 0; }
.rubrica-row > b { display: block; margin-bottom: 10px; }
.rubrica-bandas { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
@media (max-width: 800px) { .rubrica-bandas { grid-template-columns: 1fr 1fr; } }
.rubrica-banda { display: flex; flex-direction: column; gap: 4px; border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; cursor: pointer; font-size: 12px; }
.rubrica-banda:hover { border-color: var(--teal-2); }
.rubrica-banda.checked, .rubrica-banda:has(input:checked) { border-color: var(--teal-2); background: var(--teal-soft); }
.rubrica-banda input { margin: 0; }
.rubrica-banda span { font-weight: 800; }
.rubrica-banda small { color: var(--muted); line-height: 1.3; }

.gram-content { display: flex; flex-direction: column; gap: 18px; margin-bottom: 22px; }
.gram-seccion { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px; box-shadow: var(--shadow-sm); }
.gram-seccion h3 { margin: 0 0 10px; font-size: 17px; color: var(--teal); }
.gram-seccion p { margin: 0 0 4px; line-height: 1.65; }

.callout { border-radius: 16px; padding: 16px 20px; margin-bottom: 18px; }
.callout small { display: block; font-weight: 800; letter-spacing: .06em; font-size: 11px; margin-bottom: 6px; text-transform: uppercase; }
.callout p { margin: 0; line-height: 1.6; }
.callout-rae { background: var(--teal-soft); border: 1px solid #cfe6d9; }
.callout-rae small { color: var(--teal); }
.callout-accion { background: var(--nl-cloud); border: 1px solid var(--line); }
.callout-accion small { color: var(--ink-2); }

.practica-list { display: flex; flex-direction: column; gap: 16px; }
.practica-item { border-top: 1px solid var(--line); padding-top: 14px; }
.practica-item:first-child { border-top: none; padding-top: 0; }
.practica-item p { margin: 0 0 8px; }
.practica-respuesta { margin-top: 10px; background: var(--green-soft); border-radius: 10px; padding: 12px 14px; font-size: 13.5px; line-height: 1.55; color: var(--ink-2); }

.diario-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.diario-item { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; }
.diario-item input { margin-top: 3px; }

@media (max-width: 640px) {
  .rubrica-bandas { grid-template-columns: 1fr; }
}