@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --color-primario: #006a7a;
  --color-primario-hover: #004d59;
  --color-secundario: #4f46e5;
  --color-terciario: #9333ea;
  --color-acento: #10b981;
  --color-acento-hover: #059669;
  --color-peligro: #ef4444;
  --color-fondo: #d5e3e8;
  --color-superficie: #ffffff;
  --color-borde: #d1d5db;
  --color-texto-principal: #111827;
  --color-texto-secundario: #6b7281;
  --color-texto-invertido: #ffffff;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: var(--color-fondo);
  color: var(--color-texto-principal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.watermark-bg { position: relative; z-index: 1; }
.watermark-bg::before {
  content: '';
  position: fixed; inset: 0;
  background-image: url('black_icon_white_background.png');
  background-repeat: no-repeat; background-position: center; background-size: contain;
  opacity: .05; z-index: -1;
}

.app-layout { display: flex; }
.main-content { flex-grow: 1; padding: 2.5rem; height: 100vh; overflow-y: auto; box-sizing: border-box; }

.card {
  background-color: var(--color-superficie);
  border-radius: .75rem;
  border: 1px solid var(--color-borde);
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  transition: all .3s ease;
  overflow: hidden;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font-weight: 600; padding: .75rem 1.5rem; border-radius: .5rem; border: none; cursor: pointer;
  text-align: center; transition: background-color .3s ease, opacity .3s ease, transform .3s ease; text-decoration: none;
}
.btn:disabled { opacity: .6; cursor: not-allowed; }
.btn-primario { background-color: var(--color-primario); color: var(--color-texto-invertido); }
.btn-primario:hover:not(:disabled) { background-color: var(--color-primario-hover); }
.btn-secundario { background-color: var(--color-superficie); color: var(--color-primario); border: 1px solid var(--color-primario); }
.btn-secundario:hover:not(:disabled) { background-color: #eef2ff; }

.input-field, textarea.input-field {
  width: 100%; padding: .75rem; border: 1px solid var(--color-borde); border-radius: .5rem; box-sizing: border-box; margin-top: .5rem;
  font-family: 'Inter', sans-serif;
}

.spinner { width: 36px; height: 36px; border: 4px solid rgba(0,0,0,.1); border-left-color: var(--color-primario); border-radius: 50%; margin: 2rem auto; animation: spin 1s ease infinite; }
@keyframes spin { to { transform: rotate(360deg) } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* ====== NIVEL ====== */
.exercise-gif-box {
  width: 150px; height: 260px; border-radius: .75rem; border: 3px solid transparent;
  background-size: cover; background-position: center; cursor: pointer; transition: all .3s ease;
  box-shadow: 0 4px 8px rgba(0,0,0,.1); position: relative; overflow: hidden;
}
.exercise-gif-box::after { content: ''; position: absolute; inset: 0; background: rgba(0,0,0,.2); opacity: 0; transition: opacity .3s ease; }
.exercise-gif-box:hover::after { opacity: 1; transform: scale(1.1); }
.exercise-gif-box.completed { border-color: var(--color-acento); box-shadow: 0 0 15px var(--color-acento); }

.pagination-controls { display: flex; justify-content: center; align-items: center; gap: 1rem; margin-top: 2rem; }

/* ====== CONTROLES DEL NIVEL (fila superior) ====== */
.level-controls {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem;
}
.level-controls .left-group { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.level-controls .right-group { display: flex; align-items: center; gap: .5rem; justify-content: flex-end; flex-wrap: wrap; }

/* Botón GIF central (YouTube-like 16:9) + wrapper para hover deslizante */
.menu-gif-wrapper { position: relative; display: inline-block; }
.menu-gif-btn {
  width: 320px; aspect-ratio: 16/9;
  border-radius: .75rem; border: 3px solid transparent;
  background-size: cover; background-position: center;
  cursor: pointer; position: relative; overflow: hidden;
  box-shadow: 0 4px 8px rgba(0,0,0,.1); transition: all .3s ease;
}
.menu-gif-btn::after { content:''; position:absolute; inset:0; background: rgba(0,0,0,.2); opacity:0; transition: opacity .3s ease; }
.menu-gif-btn:hover { transform: scale(1.05) translateY(-2px); box-shadow: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1); }
.menu-gif-btn:hover::after { opacity: 1; }

/* Hover card que se desliza desde la izquierda del botón */
.menu-hover-card {
  position: absolute;
  left: -340px;
  top: 50%;
  transform: translateY(-50%) translateX(-12px);
  width: 320px;
  background-color: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-borde);
  border-radius: .75rem;
  padding: 1rem 1.25rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  line-height: 1.6;
  z-index: 5;
}
.menu-gif-wrapper:hover .menu-hover-card {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

@media (max-width: 900px) {
  .level-controls { grid-template-columns: 1fr; }
  .level-controls .right-group { justify-content: flex-start; }
  .menu-gif-btn { width: 100%; }
  .menu-hover-card {
    left: 0; bottom: calc(100% + 8px); top: auto;
    width: min(92vw, 360px);
    transform: translateY(0) translateX(0);
  }
  .menu-gif-wrapper:hover .menu-hover-card {
    transform: translateY(0) translateX(0);
  }
}

@media (min-width: 901px) {
  .menu-gif-btn {
    width: clamp(512px, 37vw, 576px);
  }

  .menu-hover-card {
    left: -380px;
    width: 360px;
  }
}

/* ====== MODALES ====== */
.modal-overlay {
  position: fixed; inset: 0; background-color: rgba(0,0,0,.6);
  display: flex; align-items: center; justify-content: center; z-index: 1000; animation: fadeIn .2s ease-out;
}
.modal-content {
  background: var(--color-superficie); padding: 2rem; border-radius: .75rem;
  width: 90%; max-width: 800px;
  box-shadow: 0 5px 15px rgba(0,0,0,.3); max-height: 85vh; display: flex; flex-direction: column;
}
.modal-content.sd-fullscreen {
  width: 100vw;
  height: 100vh;
  max-width: none;
  max-height: none;
  border-radius: 0;
  padding: 2rem 3rem;
  display: flex;
  flex-direction: column;
}
.modal-header { border-bottom: 1px solid var(--color-borde); padding-bottom: 1rem; margin-bottom: 1rem; }
.modal-header h3 { margin: 0; color: var(--color-primario); }
.modal-body { overflow-y: auto; padding-right: 1rem; margin-right: -1rem; }
.modal-body.sd-no-scroll { overflow: hidden; }
.modal-actions, .modal-footer { margin-top: 1.5rem; display: flex; justify-content: flex-end; gap: 1rem; padding-top: 1.5rem; border-top: 1px solid var(--color-borde); }
.modal-options-body { display: flex; flex-direction: column; gap: 1rem; align-items: center; }
.modal-options-body .btn { width: 100%; max-width: 500px; }

.exam-question-item { background-color: #f9fafb; border: 1px solid var(--color-borde); border-radius: .5rem; padding: 1.25rem; margin-bottom: 1rem; }
.ai-result-view { padding: 1rem; background-color: #f9fafb; border: 1px solid var(--color-borde); border-radius: .5rem; white-space: pre-wrap; max-height: 40vh; overflow-y: auto; }
.correction-item { background-color: #fff7ed; border-left: 4px solid #fb923c; padding: 1rem; margin-bottom: 1rem; border-radius: .25rem; }

/* ====== TipsSubmenuModal ====== */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 1rem;
}
.tips-featured {
  display: grid;
  grid-template-columns: repeat(2, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.tip-card {
  position: relative;
  border-radius: .75rem;
  overflow: hidden;
  box-shadow: 0 6px 14px rgba(0,0,0,.12);
  background-size: cover;
  background-position: center;
  cursor: pointer;
  display: flex;
  align-items: flex-end;
}
.tip-card-vertical { aspect-ratio: 9/16; }
.tip-card-square { aspect-ratio: 1 / 1; }
.tip-card::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,.55), rgba(0,0,0,0));
  opacity: .9; transition: opacity .2s ease;
}
.tip-card:hover::after { opacity: 1; }
.tip-card-label {
  position: relative; z-index: 1;
  color: white; width: 100%;
  padding: .6rem .75rem;
  font-weight: 700; letter-spacing: .3px;
  text-shadow: 0 1px 2px rgba(0,0,0,.55);
  display: flex; align-items: center; justify-content: space-between;
}
.tip-badge {
  font-size: .75rem; background: rgba(0,0,0,.45);
  padding: .25rem .5rem; border-radius: .5rem; border: 1px solid rgba(255,255,255,.18);
}

@media (max-width: 800px) {
  .tips-featured { grid-template-columns: 1fr 1fr; }
  .tips-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .tips-featured { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr 1fr; }
}

/* Panel de información lateral (hover Nivel) */
.info-overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 260px;
  height: 100vh;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  z-index: 1000;
  border-right: 1px solid var(--color-borde);
  padding: 2.0rem;
  box-sizing: border-box;
  animation: fadeIn 0.2s ease-out;
}
.info-overlay h3 { color: var(--color-primario); margin-top: 0; border-bottom: 2px solid var(--color-primario); padding-bottom: 0.5rem; }
.info-overlay p, .info-overlay li { line-height: 1.6; }

/* Efecto boom sutil en tarjetas de Guías */
.guia-card {
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  will-change: transform;
}
.guia-card:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 18px rgba(0,0,0,.12);
  border-color: var(--color-primario);
}

/* ====== Compact mode para VideoGrid (solo Clases → Estructuras) ====== */
.video-grid-compact .video-list-group {
  margin-bottom: 1.25rem;
}

.video-grid-compact .video-list-item {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--color-borde);
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
  gap: 0.9rem;
}

.video-grid-compact .video-list-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(0,0,0,.06);
  border-color: var(--color-borde);
}

.video-grid-compact .video-list-item-icon {
  width: 40px;
  height: 40px;
}

.video-grid-compact .video-list-item-icon svg {
  width: 18px;
  height: 18px;
}

.video-grid-compact h1 {
  margin-bottom: 0.25rem;
}

.video-grid-compact p {
  margin-top: 0.25rem;
  color: var(--color-texto-secundario);
}

@media (max-width: 640px) {
  .video-grid-compact .video-list-item {
    padding: 0.75rem 0.9rem;
    gap: 0.75rem;
  }
  .video-grid-compact .video-list-item-icon {
    width: 36px;
    height: 36px;
  }
  .video-grid-compact .video-list-group h2 {
    font-size: 1rem;
  }
}

/* Botón Start animado */
.btn-start-crazy {
  font-size: 1.1rem;
  padding: 1rem 1.5rem;
  border-radius: 9999px;
  background: linear-gradient(90deg, #00d4ff, #7b2ff7, #ff0080);
  background-size: 200% 200%;
  color: white;
  box-shadow: 0 10px 25px rgba(123,47,247,.35);
  animation: startGradient 3s ease infinite, startPop .9s ease-in-out infinite alternate;
  border: none;
  cursor: pointer;
}
.btn-start-crazy:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 14px 30px rgba(123,47,247,.45);
}
@keyframes startGradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes startPop {
  0% { transform: scale(1); filter: saturate(1); }
  100% { transform: scale(1.04); filter: saturate(1.15); }
}

/* ============ SPEEDDRILL · LAYOUT RESPONSIVE ============ */
.sd-shell {
  display: grid;
  width: 100%;
  height: 100%;
  min-height: 0;
}

/* PC: sidebar derecho horizontal */
@media (min-width: 901px) {
  .sd-shell {
    grid-template-columns: 1fr 380px;
    gap: 1.5rem;
    align-items: stretch;
    padding: 1rem;
  }
}

/* Mobile: layout vertical */
@media (max-width: 900px) {
  .sd-shell {
    grid-template-columns: minmax(240px, 1fr);
    gap: 0.85rem;
    align-items: center;
    justify-items: center;
  }
}

.sd-sidebar {
  width: 100%;
  align-self: stretch;
  display: grid;
  align-content: center;
  gap: .75rem;
}
.sd-center {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 0;
}
.sd-stage {
  position: relative;
  aspect-ratio: 9 / 16;
  height: min(80vh, 100%);
  max-height: 100%;
  width: auto;
  max-width: 520px;
  background: #000;
  border-radius: .9rem;
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(0,0,0,.2);
  display: flex;
  align-items: center;
  justify-content: center;
}
.sd-stage > video,
.sd-stage > img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.sd-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.65);
  z-index: 10;
  animation: fadeIn .18s ease-out;
}
.sd-overlay-img {
  width: min(70%, 420px);
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: .75rem;
}

/* ============ SPEEDDRILL · OPTIMIZACIONES PC ============ */
.sd-live-layout {
  will-change: contents;
}

.sd-live-side {
  will-change: scroll-position;
}

.sd-live-side button {
  will-change: transform, box-shadow;
  transform: translate3d(0, 0, 0); /* GPU acceleration */
  transition: box-shadow 0.08s ease-out, transform 0.08s ease-out;
}

.sd-live-side button:active {
  transform: translate3d(0, 2px, 0);
}

.sd-stage {
  will-change: scroll-position;
}

.sd-stage video {
  will-change: contents;
}

/* Disable animations en mobile para mejor fluidez */
@media (max-width: 900px) {
  .sd-live-side button {
    will-change: auto;
  }
}

/* ============ PASO A PASO · POR AQUÍ SE EMPIEZA ============ */
.paso-start-card {
  position: relative;
  overflow: hidden;
}
.paso-start-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    900px 300px at 20% 0%,
    rgba(0, 106, 122, 0.18),
    transparent 60%
  );
  pointer-events: none;
}
.paso-start-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}
.paso-start-kicker {
  margin: 0;
  color: var(--color-texto-secundario);
  line-height: 1.6;
}
.paso-start-badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .75rem;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,0.08);
  background: rgba(255,255,255,0.7);
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
  font-weight: 800;
  color: var(--color-primario);
  white-space: nowrap;
  position: relative;
  z-index: 1;
}
.paso-start-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  position: relative;
  z-index: 1;
}
@media (max-width: 820px) {
  .paso-start-grid { grid-template-columns: 1fr; }
}
.paso-gif-btn {
  text-align: left;
  width: 100%;
  border: 1px solid rgba(0,0,0,0.10);
  border-radius: 16px;
  padding: 0;
  background: rgba(255,255,255,0.85);
  cursor: pointer;
  box-shadow:
    0 12px 26px rgba(0,0,0,0.10),
    inset 0 1px 0 rgba(255,255,255,0.85);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, filter 160ms ease;
  overflow: hidden;
  will-change: transform;
}
.paso-gif-btn:hover {
  transform: translateY(-4px);
  box-shadow:
    0 18px 36px rgba(0,0,0,0.14),
    inset 0 1px 0 rgba(255,255,255,0.92);
  border-color: rgba(0,0,0,0.18);
}
.paso-gif-btn:active {
  transform: translateY(-2px) scale(0.995);
  filter: saturate(1.05);
}
.paso-gif-media {
  position: relative;
  background: rgba(0,0,0,0.03);
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.paso-gif-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
  display: block;
  transform: scale(1.01);
  transition: transform 180ms ease;
}
.paso-gif-btn:hover .paso-gif-img { transform: scale(1.05); }
.paso-gif-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.35), rgba(0,0,0,0));
  opacity: 0.75;
  pointer-events: none;
  transition: opacity 180ms ease;
}
.paso-gif-btn:hover .paso-gif-media::after { opacity: 0.9; }
.paso-gif-meta {
  padding: 0.95rem 1rem 1rem 1rem;
  display: grid;
  gap: .25rem;
}
.paso-gif-title {
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: .2px;
}
.paso-gif-subtitle {
  opacity: 0.75;
  font-size: 0.95rem;
  color: var(--color-texto-secundario);
  line-height: 1.35;
}
.paso-gif-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  margin-top: .35rem;
  width: fit-content;
  padding: .28rem .55rem;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,0.10);
  background: rgba(255,255,255,0.72);
  font-size: .78rem;
  font-weight: 800;
  color: var(--color-primario);
}