:root {
  --ink: #1a2332;
  --ink-soft: #3d4a5c;
  --paper: #f7f3eb;
  --paper-2: #efe8dc;
  --sea: #0d6e6e;
  --sea-deep: #0a5555;
  --coral: #c45c26;
  --sand: #e8dcc8;
  --ok: #1f7a4d;
  --bad: #a33b2c;
  --line: rgba(26, 35, 50, 0.12);
  --shadow: 0 18px 50px rgba(26, 35, 50, 0.12);
  --radius: 18px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Outfit", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}

.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(13, 110, 110, 0.18), transparent 55%),
    radial-gradient(700px 420px at 95% 5%, rgba(196, 92, 38, 0.14), transparent 50%),
    linear-gradient(165deg, #faf6ef 0%, #ebe3d4 45%, #e2ebe8 100%);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 243, 235, 0.82);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 40;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 12px;
  background: var(--sea);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
}

.brand-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}

.nav {
  display: flex;
  gap: 0.35rem;
  margin-left: auto;
}

.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  background: var(--sand);
  color: var(--ink);
}

.nav a.active {
  background: var(--sea);
  color: #fff;
}

.app {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.2;
  margin: 0 0 0.65rem;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.lead {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 38rem;
}

.muted {
  color: var(--ink-soft);
}

.hero {
  padding: 1.5rem 0 0.5rem;
  animation: rise 0.55s ease both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.zone-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.zone-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 1.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.zone-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 55px rgba(26, 35, 50, 0.16);
}

.zone-card.learn {
  border-top: 4px solid var(--sea);
}

.zone-card.mock {
  border-top: 4px solid var(--coral);
}

.zone-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sea);
  margin-bottom: 0.4rem;
}

.zone-card.mock .zone-label {
  color: var(--coral);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.stat {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.75rem 1rem;
  min-width: 7.5rem;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  font-family: var(--font-display);
}

.btn-primary,
.btn-secondary,
.btn-ghost,
.btn-danger {
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 999px;
  padding: 0.7rem 1.2rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.btn-primary {
  background: var(--sea);
  color: #fff;
}

.btn-primary:hover {
  background: var(--sea-deep);
}

.btn-secondary {
  background: var(--sand);
  color: var(--ink);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-soft);
}

.btn-danger {
  background: var(--coral);
  color: #fff;
}

.section-head {
  margin-bottom: 1.25rem;
  animation: rise 0.4s ease both;
}

.lesson-list {
  display: grid;
  gap: 0.75rem;
}

.lesson-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.9rem;
  align-items: center;
  padding: 1rem 1.1rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s ease;
}

.lesson-item:hover {
  background: #fff;
}

.lesson-num {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--sea);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}

.lesson-item.done .lesson-num {
  background: var(--ok);
}

.lesson-item .meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: var(--sand);
}

.badge.done {
  background: #d8efe3;
  color: var(--ok);
}

.panel {
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1rem 0;
  animation: rise 0.35s ease both;
}

.steps {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.step-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--sand);
}

.step-dot.on {
  background: var(--sea);
  transform: scale(1.25);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 0.75rem 0;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  background: var(--sand);
  font-family: var(--font-display);
}

.example {
  margin: 0.75rem 0;
  padding: 0.85rem 1rem;
  border-left: 4px solid var(--sea);
  background: rgba(13, 110, 110, 0.06);
  border-radius: 0 12px 12px 0;
}

.example .en {
  font-weight: 600;
  font-size: 1.05rem;
}

.example .es {
  color: var(--ink-soft);
  margin-top: 0.25rem;
}

.warning-box {
  border-left-color: var(--coral);
  background: rgba(196, 92, 38, 0.08);
}

.word {
  cursor: help;
  border-bottom: 1.5px dashed var(--sea);
  color: var(--sea-deep);
}

.tooltip-pop {
  position: absolute;
  z-index: 50;
  max-width: 240px;
  padding: 0.55rem 0.7rem;
  background: var(--ink);
  color: #fff;
  border-radius: 10px;
  font-size: 0.85rem;
  pointer-events: none;
  transform: translateY(-110%);
}

.actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.1rem;
}

.quiz-card {
  margin-top: 0.5rem;
}

.quiz-q {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.options {
  display: grid;
  gap: 0.55rem;
}

.option {
  text-align: left;
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  border: 1.5px solid var(--line);
  background: #fff;
  font: inherit;
  cursor: pointer;
}

.option:hover:not(:disabled) {
  border-color: var(--sea);
}

.option.correct {
  border-color: var(--ok);
  background: #e6f6ee;
}

.option.wrong {
  border-color: var(--bad);
  background: #fceceb;
}

.option:disabled {
  cursor: default;
}

.feedback {
  margin-top: 0.9rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  background: var(--paper-2);
}

.feedback.ok {
  background: #e6f6ee;
  color: var(--ok);
}

.feedback.bad {
  background: #fceceb;
  color: var(--bad);
}

.fill-input {
  width: 100%;
  max-width: 280px;
  padding: 0.7rem 0.9rem;
  border-radius: 12px;
  border: 1.5px solid var(--line);
  font: inherit;
  font-size: 1.05rem;
}

.progress-bar {
  height: 8px;
  background: var(--sand);
  border-radius: 999px;
  overflow: hidden;
  margin: 0.75rem 0 1.25rem;
}

.progress-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--sea), #1a9a8a);
  border-radius: inherit;
  transition: width 0.3s ease;
}

.flash-card {
  min-height: 200px;
  display: grid;
  place-items: center;
  text-align: center;
  cursor: pointer;
  user-select: none;
}

.flash-card .front {
  font-size: 2rem;
  font-family: var(--font-display);
}

.flash-card .back {
  font-size: 1.35rem;
}

.audio-box {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  margin: 1rem 0;
  padding: 1rem;
  background: rgba(13, 110, 110, 0.08);
  border-radius: 14px;
}

.cheatsheet {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(26, 35, 50, 0.45);
  display: grid;
  place-items: end center;
  padding: 1rem;
}

.cheatsheet[hidden] {
  display: none;
}

.cheatsheet-inner {
  width: min(480px, 100%);
  background: var(--paper);
  border-radius: 20px 20px 12px 12px;
  padding: 1.35rem;
  box-shadow: var(--shadow);
  animation: slide-up 0.3s ease;
}

.signal-list {
  padding-left: 1.1rem;
  margin: 0.75rem 0 1.1rem;
}

.signal-list li {
  margin-bottom: 0.45rem;
}

.mock-list {
  display: grid;
  gap: 1rem;
}

.mock-card {
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
}

.mock-card h3 {
  margin-bottom: 0.35rem;
}

.score-big {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--sea);
  margin: 0.5rem 0;
}

.split-note {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1rem 0;
}

@media (max-width: 640px) {
  .nav {
    margin-left: 0;
    width: 100%;
    order: 3;
  }

  .split-note {
    grid-template-columns: 1fr;
  }

  .lesson-item {
    grid-template-columns: auto 1fr;
  }

  .lesson-item .badge {
    grid-column: 2;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}