/* ================= Tokens ================= */
:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f7f7f7;
  --border: #e5e5e5;
  --text: #3c3c3c;
  --muted: #777777;

  --green: #58cc02;   --green-d: #58a700;  --green-bg: #d7ffb8;
  --red: #ff4b4b;     --red-d: #ea2b2b;    --red-bg: #ffdfe0;
  --blue: #1cb0f6;    --blue-d: #1899d6;   --blue-bg: #ddf4ff;
  --yellow: #ffc800;  --yellow-d: #e5a000;
  --orange: #ff9600;  --orange-d: #cd7900;
  --purple: #ce82ff;  --purple-d: #a568cc;
  --pink: #ff86d0;    --pink-d: #d66fae;
  --gold: #ffc800;    --gold-d: #d9a400;

  --code-bg: #f6f8fa;
  --k: #0000ff; --s: #a31515; --c: #008000; --v: #7a3e9d; --f: #c700c7; --n: #098658;

  --radius: 16px;
  --font: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131f24; --surface: #131f24; --surface-2: #202f36; --border: #37464f;
    --text: #f1f7fb; --muted: #8fa5b0;
    --green-bg: #1f3a18; --red-bg: #3d1f22; --blue-bg: #13354a;
    --code-bg: #0d1a1f;
    --k: #569cd6; --s: #ce9178; --c: #6a9955; --v: #c586c0; --f: #dcdcaa; --n: #b5cea8;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #131f24; --surface: #131f24; --surface-2: #202f36; --border: #37464f;
  --text: #f1f7fb; --muted: #8fa5b0;
  --green-bg: #1f3a18; --red-bg: #3d1f22; --blue-bg: #13354a;
  --code-bg: #0d1a1f;
  --k: #569cd6; --s: #ce9178; --c: #6a9955; --v: #c586c0; --f: #dcdcaa; --n: #b5cea8;
  color-scheme: dark;
}

/* ================= Base ================= */
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-weight: 700;
  font-size: 16px;
  overflow-x: hidden;
}
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
code { font-family: var(--mono); font-size: .88em; background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-weight: 600; }
.hidden { display: none !important; }

.screen {
  max-width: 560px;
  margin: 0 auto;
  min-height: 100dvh;
  padding: 0 16px;
}

/* ================= Buttons ================= */
.btn {
  display: block; width: 100%;
  padding: 14px 18px;
  border-radius: 16px;
  font-weight: 800; font-size: 16px; letter-spacing: .6px; text-transform: uppercase;
  background: var(--surface); color: var(--blue);
  border: 2px solid var(--border);
  box-shadow: 0 4px 0 var(--border);
  transition: transform .06s, filter .15s;
}
.btn:active:not(:disabled) { transform: translateY(4px); box-shadow: 0 0 0 transparent; }
.btn.primary { background: var(--green); color: #fff; border-color: var(--green); box-shadow: 0 4px 0 var(--green-d); }
.btn.primary:disabled { background: var(--border); border-color: var(--border); color: var(--muted); box-shadow: 0 4px 0 var(--border); cursor: default; }
.btn.ghost { border-color: transparent; box-shadow: none; color: var(--muted); }
.btn.danger { background: var(--red); border-color: var(--red); color: #fff; box-shadow: 0 4px 0 var(--red-d); }
.icon-btn { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; font-size: 20px; color: var(--muted); }
.icon-btn:active { background: var(--surface-2); }
.link { color: var(--muted); text-decoration: underline; font-size: 14px; }

/* ================= Home ================= */
.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0; padding-top: max(12px, env(safe-area-inset-top));
  background: var(--bg);
  border-bottom: 2px solid var(--border);
  margin: 0 -16px; padding-left: 16px; padding-right: 16px;
}
.brand { font-weight: 900; font-size: 22px; color: var(--green); display: flex; align-items: center; gap: 6px; }
.logo { font-size: 26px; }
.stats { display: flex; align-items: center; gap: 12px; }
.stat { font-size: 17px; display: flex; gap: 3px; align-items: center; }
.stat.streak b { color: var(--orange); }
.stat.xp b { color: var(--yellow-d); }

.hero { padding: 22px 0 8px; }
.hero h1 { margin: 0 0 4px; font-size: 26px; font-weight: 900; }
.hero p { margin: 0 0 14px; color: var(--muted); font-weight: 600; }
.overall { display: flex; align-items: center; gap: 10px; }
.overall span { font-weight: 800; color: var(--green); min-width: 44px; text-align: right; }

.bar { flex: 1; height: 14px; border-radius: 99px; background: var(--border); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--green); border-radius: 99px; transition: width .4s cubic-bezier(.3,1.4,.5,1); position: relative; }
.bar i::after { content: ''; position: absolute; left: 8px; right: 8px; top: 3px; height: 4px; border-radius: 99px; background: rgba(255,255,255,.3); }
.bar.big { height: 16px; }

.quick { display: grid; gap: 12px; margin: 18px 0 8px; }
.card-btn {
  display: flex; align-items: center; gap: 14px; text-align: left;
  padding: 14px 16px; border-radius: var(--radius);
  border: 2px solid var(--border); box-shadow: 0 4px 0 var(--border);
  background: var(--surface);
}
.card-btn:active { transform: translateY(4px); box-shadow: none; }
.card-btn .ico { font-size: 28px; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; background: var(--blue-bg); flex: none; }
.card-btn.review .ico { background: var(--red-bg); }
.card-btn b { display: block; font-size: 17px; }
.card-btn small { color: var(--muted); font-weight: 600; font-size: 14px; }
.card-btn:disabled { opacity: .55; }

/* Path of units */
.path { display: flex; flex-direction: column; align-items: center; padding: 26px 0 10px; gap: 10px; }
.unit-row { display: flex; flex-direction: column; align-items: center; gap: 8px; width: 100%; }
.unit-header {
  width: 100%; border-radius: var(--radius); padding: 14px 18px; color: #fff;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 14px;
}
.unit-header b { display: block; font-size: 18px; font-weight: 900; }
.unit-header small { opacity: .9; font-weight: 700; }
.unit-header .guide { border: 2px solid rgba(255,255,255,.45); border-radius: 12px; padding: 8px 10px; font-weight: 800; font-size: 13px; white-space: nowrap; text-transform: uppercase; }
.node-wrap { position: relative; margin: 10px 0 4px; }
.node {
  width: 76px; height: 70px; border-radius: 50%;
  display: grid; place-items: center; font-size: 30px;
  background: var(--c); box-shadow: 0 7px 0 var(--cd);
  position: relative; transition: transform .08s;
}
.node:active { transform: translateY(6px); box-shadow: 0 1px 0 var(--cd); }
.node.done::after { content: '✓'; position: absolute; right: -6px; bottom: -4px; width: 26px; height: 26px; border-radius: 50%; background: var(--yellow); color: #fff; font-size: 16px; display: grid; place-items: center; font-weight: 900; box-shadow: 0 2px 0 var(--yellow-d); }
.ring { position: absolute; inset: -9px; border-radius: 50%; }
.stars { text-align: center; font-size: 13px; margin-top: 12px; color: var(--muted); letter-spacing: 2px; }

.c-blue   { --c: var(--blue);   --cd: var(--blue-d); }
.c-red    { --c: var(--red);    --cd: var(--red-d); }
.c-purple { --c: var(--purple); --cd: var(--purple-d); }
.c-orange { --c: var(--orange); --cd: var(--orange-d); }
.c-green  { --c: var(--green);  --cd: var(--green-d); }
.c-yellow { --c: var(--yellow); --cd: var(--yellow-d); }
.c-pink   { --c: var(--pink);   --cd: var(--pink-d); }
.c-gold   { --c: var(--gold);   --cd: var(--gold-d); }
.unit-header.c-blue, .unit-header.c-red, .unit-header.c-purple, .unit-header.c-orange,
.unit-header.c-green, .unit-header.c-yellow, .unit-header.c-pink, .unit-header.c-gold { background: var(--c); }

.foot { text-align: center; color: var(--muted); font-size: 13px; padding: 30px 0 40px; }

/* Popover */
.pop { position: fixed; inset: 0; z-index: 20; background: rgba(0,0,0,.25); display: flex; align-items: flex-end; justify-content: center; padding: 16px; padding-bottom: max(16px, env(safe-area-inset-bottom)); animation: fade .15s; }
.pop-card { width: 100%; max-width: 528px; background: var(--c); color: #fff; border-radius: 20px; padding: 18px; display: grid; gap: 10px; animation: up .22s cubic-bezier(.3,1.3,.5,1); }
.pop-card b { font-size: 20px; font-weight: 900; }
.pop-card small { font-weight: 700; opacity: .92; margin-bottom: 6px; }
.pop-card .btn.primary { background: #fff; color: var(--cd); border-color: #fff; box-shadow: 0 4px 0 rgba(0,0,0,.18); }
.pop-card .btn.ghost { color: #fff; }

/* ================= Lesson ================= */
#lesson { display: flex; flex-direction: column; padding-bottom: 0; }
.lesson-top { display: flex; align-items: center; gap: 12px; padding: 14px 0; padding-top: max(14px, env(safe-area-inset-top)); }
.hearts { font-size: 18px; display: flex; gap: 2px; align-items: center; }
.hearts b { color: var(--red); }
.hearts.hit { animation: shake .4s; }

.combo { text-align: center; color: var(--orange); font-weight: 900; font-size: 14px; letter-spacing: 1px; text-transform: uppercase; animation: pop .35s; }

.q-area { flex: 1; padding: 10px 0 150px; animation: slide .25s ease-out; }
.q-kind { font-size: 13px; font-weight: 900; text-transform: uppercase; letter-spacing: 1px; color: var(--purple-d); display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
.q-text { font-size: 21px; font-weight: 800; line-height: 1.35; margin: 0 0 16px; }
.q-text code { font-size: .8em; }

pre.code {
  font-family: var(--mono); font-size: 13.5px; line-height: 1.55;
  background: var(--code-bg); border: 2px solid var(--border); border-radius: 14px;
  padding: 12px 14px; margin: 0 0 18px; overflow-x: auto; white-space: pre-wrap; overflow-wrap: anywhere; font-weight: 400;
  -webkit-overflow-scrolling: touch;
}
.tk-k { color: var(--k); font-weight: 600; }
.tk-s { color: var(--s); }
.tk-c { color: var(--c); font-style: italic; }
.tk-v { color: var(--v); }
.tk-f { color: var(--f); }
.tk-n { color: var(--n); }

/* Opciones */
.options { display: grid; gap: 10px; }
.opt {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  padding: 13px 14px; border-radius: 14px;
  border: 2px solid var(--border); box-shadow: 0 4px 0 var(--border);
  background: var(--surface); font-weight: 700; font-size: 16px; line-height: 1.3;
}
.opt .num { flex: none; width: 28px; height: 28px; border-radius: 8px; border: 2px solid var(--border); display: grid; place-items: center; font-size: 13px; color: var(--muted); }
.opt .txt { white-space: pre-line; }
.opt .txt.mono { font-family: var(--mono); font-size: 13.5px; font-weight: 600; white-space: pre-wrap; }
.opt:active { transform: translateY(2px); }
.opt.sel { border-color: var(--blue); background: var(--blue-bg); box-shadow: 0 4px 0 var(--blue); color: var(--blue-d); }
.opt.sel .num { border-color: var(--blue); color: var(--blue); }
.opt.ok { border-color: var(--green); background: var(--green-bg); box-shadow: 0 4px 0 var(--green); color: var(--green-d); }
.opt.bad { border-color: var(--red); background: var(--red-bg); box-shadow: 0 4px 0 var(--red); color: var(--red-d); }
.tf { grid-template-columns: 1fr 1fr; }
.tf .opt { justify-content: center; font-size: 18px; padding: 18px; }

/* Fill blanks */
pre.code input.blank {
  font: 600 13.5px var(--mono);
  color: var(--blue-d);
  background: var(--blue-bg);
  border: 0; border-bottom: 3px solid var(--blue);
  border-radius: 6px 6px 2px 2px;
  padding: 2px 6px; margin: 0 2px;
  width: 9ch; min-width: 5ch;
  outline: none;
  text-transform: none;
}
pre.code input.blank:focus { border-bottom-color: var(--green); }
pre.code input.blank.ok { background: var(--green-bg); color: var(--green-d); border-color: var(--green); }
pre.code input.blank.bad { background: var(--red-bg); color: var(--red-d); border-color: var(--red); }

textarea.write {
  width: 100%; min-height: 110px; resize: vertical;
  font: 600 15px var(--mono); color: var(--text);
  background: var(--code-bg); border: 2px solid var(--border); border-radius: 14px;
  padding: 12px 14px; outline: none;
}
textarea.write:focus { border-color: var(--blue); }
.hint { color: var(--muted); font-weight: 600; font-size: 14px; margin-top: 8px; }

/* Build (banco de palabras) */
.answer-line {
  min-height: 64px; padding: 8px 0 10px;
  border-bottom: 2px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 8px; align-content: flex-start;
  margin-bottom: 26px;
  background-image: linear-gradient(var(--border), var(--border));
  background-size: 100% 2px; background-repeat: no-repeat; background-position: 0 58px;
}
.bank { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip {
  font: 600 14px var(--mono);
  padding: 9px 12px; border-radius: 12px;
  border: 2px solid var(--border); box-shadow: 0 3px 0 var(--border);
  background: var(--surface); color: var(--text);
  animation: pop .18s;
}
.chip:active { transform: translateY(2px); box-shadow: none; }
.chip.used { color: transparent; background: var(--border); box-shadow: none; pointer-events: none; }

/* Order (líneas) */
.order-answer { display: grid; gap: 8px; min-height: 60px; padding: 10px; margin-bottom: 18px; border: 2px dashed var(--border); border-radius: 14px; counter-reset: ln; }
.order-answer:empty::before { content: 'Toca las líneas en el orden correcto 👇'; color: var(--muted); font-weight: 600; font-size: 14px; padding: 8px; }
.line-chip {
  font: 600 13px var(--mono); text-align: left;
  padding: 10px 12px; border-radius: 12px; line-height: 1.4;
  border: 2px solid var(--border); box-shadow: 0 3px 0 var(--border);
  background: var(--surface); color: var(--text);
  word-break: break-word;
  animation: pop .18s;
}
.order-answer .line-chip { counter-increment: ln; border-color: var(--blue); box-shadow: 0 3px 0 var(--blue); background: var(--blue-bg); }
.order-answer .line-chip::before { content: counter(ln) '. '; color: var(--blue-d); }
.order-bank { display: grid; gap: 8px; }
.line-chip.used { opacity: .3; pointer-events: none; box-shadow: none; }
.order-answer .line-chip.ok { border-color: var(--green); background: var(--green-bg); box-shadow: 0 3px 0 var(--green); }
.order-answer .line-chip.bad { border-color: var(--red); background: var(--red-bg); box-shadow: 0 3px 0 var(--red); }

/* Match */
.match { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.match .col { display: grid; gap: 10px; align-content: start; }
.m-item {
  min-height: 56px; padding: 10px; border-radius: 14px; text-align: center;
  border: 2px solid var(--border); box-shadow: 0 4px 0 var(--border);
  background: var(--surface); font-weight: 700; font-size: 15px; line-height: 1.25;
  word-break: break-word;
}
.m-item.mono { font-family: var(--mono); font-size: 13px; font-weight: 600; }
.m-item.sel { border-color: var(--blue); background: var(--blue-bg); box-shadow: 0 4px 0 var(--blue); color: var(--blue-d); }
.m-item.ok { border-color: var(--green); background: var(--green-bg); color: var(--green-d); box-shadow: 0 4px 0 var(--green); animation: pop .25s; }
.m-item.gone { opacity: .35; pointer-events: none; box-shadow: none; border-color: var(--border); background: var(--surface); color: var(--muted); }
.m-item.bad { border-color: var(--red); background: var(--red-bg); color: var(--red-d); box-shadow: 0 4px 0 var(--red); animation: shake .35s; }

/* Barra inferior */
.check-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 6;
  display: flex; gap: 12px; justify-content: center;
  padding: 16px; padding-bottom: max(16px, env(safe-area-inset-bottom));
  background: var(--bg); border-top: 2px solid var(--border);
}
.check-bar .btn { max-width: 260px; }
.check-bar .btn.ghost { max-width: 130px; border: 2px solid var(--border); box-shadow: 0 4px 0 var(--border); }

/* Hoja de feedback */
.sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 7;
  transform: translateY(105%); transition: transform .28s cubic-bezier(.3,1.2,.5,1);
  background: var(--green-bg);
}
.sheet.show { transform: none; }
.sheet-inner { max-width: 560px; margin: 0 auto; padding: 18px 16px; padding-bottom: max(18px, env(safe-area-inset-bottom)); }
.sheet-title { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 900; color: var(--green-d); margin-bottom: 6px; }
.sheet-title span { width: 36px; height: 36px; border-radius: 50%; background: #fff; display: grid; place-items: center; font-size: 20px; }
.sheet-body { color: var(--green-d); font-weight: 700; margin-bottom: 14px; max-height: 38vh; overflow: auto; }
.sheet-body .lbl { font-weight: 900; }
.sheet-body pre { font: 600 13px var(--mono); white-space: pre-wrap; margin: 6px 0; background: rgba(255,255,255,.55); padding: 8px 10px; border-radius: 10px; color: inherit; }
.sheet-body .ex { font-weight: 600; opacity: .95; margin-top: 8px; }
.sheet #nextBtn { background: var(--green); color: #fff; border-color: var(--green); box-shadow: 0 4px 0 var(--green-d); }
.sheet.bad { background: var(--red-bg); }
.sheet.bad .sheet-title, .sheet.bad .sheet-body { color: var(--red-d); }
.sheet.bad #nextBtn { background: var(--red); border-color: var(--red); box-shadow: 0 4px 0 var(--red-d); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .sheet-title span { background: var(--surface-2); }
  :root:not([data-theme="light"]) .sheet-body pre { background: rgba(0,0,0,.25); }
  :root:not([data-theme="light"]) .sheet-title, :root:not([data-theme="light"]) .sheet-body { color: var(--green); }
  :root:not([data-theme="light"]) .sheet.bad .sheet-title, :root:not([data-theme="light"]) .sheet.bad .sheet-body { color: var(--red); }
}

/* ================= Resultado ================= */
#result { display: grid; place-items: center; text-align: center; position: relative; }
.result-inner { width: 100%; padding: 40px 0; position: relative; z-index: 2; }
.result-emoji { font-size: 84px; animation: bounce 1s infinite alternate; }
#result h2 { font-size: 28px; font-weight: 900; color: var(--yellow-d); margin: 10px 0 22px; }
.res-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.res-card { border: 2px solid var(--c); border-radius: 16px; overflow: hidden; }
.res-card small { display: block; background: var(--c); color: #fff; font-weight: 900; font-size: 12px; text-transform: uppercase; padding: 4px; letter-spacing: .5px; }
.res-card b { display: block; padding: 12px 4px; font-size: 22px; color: var(--c); }
.res-card.gold { --c: var(--yellow); }
.res-card.green { --c: var(--green); }
.res-card.blue { --c: var(--blue); }
#resMsg { color: var(--muted); font-weight: 700; margin: 0 0 22px; }
#result .btn { margin-bottom: 10px; }
#confetti { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 1; }

/* ================= Chuleta ================= */
.modal { position: fixed; inset: 0; z-index: 30; background: rgba(0,0,0,.4); display: flex; align-items: flex-end; justify-content: center; animation: fade .15s; }
.modal-card { width: 100%; max-width: 560px; max-height: 92dvh; background: var(--bg); border-radius: 22px 22px 0 0; display: flex; flex-direction: column; animation: up .25s cubic-bezier(.3,1.2,.5,1); }
.modal-card header { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px 10px; border-bottom: 2px solid var(--border); }
.modal-card h3 { margin: 0; font-size: 20px; font-weight: 900; }
.modal-body { overflow-y: auto; padding: 8px 16px 16px; -webkit-overflow-scrolling: touch; }
.modal-body h4 { margin: 18px 0 6px; font-size: 17px; font-weight: 900; color: var(--blue-d); }
.modal-body p { margin: 0 0 10px; font-weight: 600; line-height: 1.5; }
.modal-body pre.code { font-size: 12px; white-space: pre; overflow-wrap: normal; }
.modal-card footer { padding: 12px 16px; padding-bottom: max(12px, env(safe-area-inset-bottom)); border-top: 2px solid var(--border); }

/* ================= Animaciones ================= */
@keyframes fade { from { opacity: 0; } }
@keyframes up { from { transform: translateY(40px); opacity: 0; } }
@keyframes slide { from { transform: translateX(24px); opacity: 0; } }
@keyframes pop { 0% { transform: scale(.85); } 60% { transform: scale(1.06); } 100% { transform: scale(1); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 20%,60% { transform: translateX(-6px); } 40%,80% { transform: translateX(6px); } }
@keyframes bounce { to { transform: translateY(-12px) scale(1.05); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }

@media (min-width: 600px) {
  .q-text { font-size: 23px; }
  pre.code { font-size: 14.5px; }
}

/* ================= Historias ================= */
.c-muted { --c: var(--surface-2); --cd: var(--border); }
.sec-title { font-size: 20px; font-weight: 900; margin: 26px 0 12px; display: flex; flex-direction: column; }
.sec-title small { font-size: 14px; color: var(--muted); font-weight: 700; }
.story-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.story-card {
  position: relative; display: flex; flex-direction: column; align-items: center; text-align: center; gap: 4px;
  padding: 16px 10px 14px; border-radius: var(--radius);
  border: 2px solid var(--border); box-shadow: 0 4px 0 var(--border); background: var(--surface);
}
.story-card:active { transform: translateY(4px); box-shadow: none; }
.story-card .st-ico { width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center; font-size: 32px; background: var(--c); box-shadow: 0 4px 0 var(--cd); margin-bottom: 8px; }
.story-card b { font-size: 15px; line-height: 1.2; }
.story-card small { color: var(--muted); font-weight: 700; font-size: 12.5px; }
.story-card.done::after { content: '✓'; position: absolute; top: 8px; right: 8px; width: 24px; height: 24px; border-radius: 50%; background: var(--yellow); color: #fff; display: grid; place-items: center; font-size: 14px; font-weight: 900; box-shadow: 0 2px 0 var(--yellow-d); }

.st-title { display: flex; align-items: center; gap: 12px; padding: 14px; border-radius: var(--radius); background: var(--c); color: #fff; margin-bottom: 18px; }
.st-title span { font-size: 34px; }
.st-title small { display: block; font-weight: 800; opacity: .9; font-size: 12.5px; }
.st-title b { font-size: 19px; font-weight: 900; }

.st-nar { text-align: center; color: var(--muted); font-weight: 700; font-style: italic; margin: 14px 8px 16px; line-height: 1.45; animation: up .3s ease-out; }
.st-nar pre.code { text-align: left; font-style: normal; margin-top: 8px; }
.st-row { display: flex; align-items: flex-end; gap: 10px; margin: 0 0 14px; animation: up .3s ease-out; }
.st-row.me { flex-direction: row-reverse; }
.st-av { flex: none; width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; font-size: 24px; background: var(--c); box-shadow: 0 3px 0 var(--cd); }
.st-bubble { max-width: calc(100% - 54px); padding: 10px 14px; border-radius: 18px 18px 18px 4px; border: 2px solid var(--border); background: var(--surface); line-height: 1.4; font-size: 16px; }
.st-row.me .st-bubble { border-radius: 18px 18px 4px 18px; border-color: var(--green); background: var(--green-bg); }
.st-name { display: block; font-size: 12.5px; font-weight: 900; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 2px; }
.st-bubble pre.code { margin: 8px 0 2px; font-size: 12.5px; }
.story-q { border-top: 2px dashed var(--border); border-bottom: 2px dashed var(--border); padding: 16px 0 18px; margin: 6px 0 18px; animation: up .3s ease-out; }
.story-q.frozen { opacity: .6; pointer-events: none; }
.story-q.frozen .hint { display: none; }

/* ================= Esquema de BD ================= */
.dbcard { border: 2px solid var(--blue); border-radius: 14px; background: var(--blue-bg); margin: 0 0 16px; overflow: hidden; }
.dbcard summary { cursor: pointer; padding: 10px 14px; font-size: 15px; color: var(--blue-d); list-style: none; display: flex; align-items: center; gap: 6px; }
.dbcard summary::-webkit-details-marker { display: none; }
.dbcard summary::after { content: '▾'; margin-left: auto; transition: transform .2s; }
.dbcard[open] summary::after { transform: rotate(180deg); }
.dbcard summary small { color: var(--muted); font-weight: 700; }
.db-tables { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; padding: 0 10px 10px; }
.db-table { background: var(--surface); border: 2px solid var(--border); border-radius: 10px; padding: 8px 10px; font-family: var(--mono); font-size: 12px; line-height: 1.5; }
.db-table > b { display: block; font-family: var(--font); font-size: 14px; font-weight: 900; margin-bottom: 2px; color: var(--text); }
.db-table .col span { font-weight: 600; }
.db-table .col i { font-style: normal; color: var(--muted); font-size: 11px; }
.db-table .col.pk span::before { content: '🔑 '; }
.db-table .col.fk span::before { content: '🔗 '; }
.db-table .col.pk.fk span::before { content: '🔑🔗 '; }
.modal-body .dbcard { margin-top: 10px; }

/* ================= Meta, fecha y herramientas ================= */
.goal { border: 2px solid var(--border); border-radius: var(--radius); padding: 12px 14px; margin-top: 16px; display: grid; gap: 8px; }
.goal-row { display: flex; justify-content: space-between; align-items: center; }
.goal-row b { color: var(--yellow-d); }
.goal .bar i { background: var(--yellow); }
.countdown { position: relative; display: block; padding: 10px 12px; border-radius: 12px; background: var(--surface-2); font-weight: 700; cursor: pointer; }
.countdown b { color: var(--red); }
.countdown input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; border: 0; }

.tools { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.tool { display: grid; justify-items: start; gap: 2px; text-align: left; padding: 12px 14px; border-radius: var(--radius); background: var(--c); color: #fff; box-shadow: 0 4px 0 var(--cd); }
.tool:active { transform: translateY(4px); box-shadow: none; }
.tool span { font-size: 26px; }
.tool b { font-size: 16px; font-weight: 900; }
.tool small { font-weight: 700; opacity: .92; font-size: 12.5px; }

/* ================= Sub-pantallas ================= */
.sub-top { position: sticky; top: 0; z-index: 5; background: var(--bg); display: flex; align-items: center; gap: 8px; padding: 12px 0; padding-top: max(12px, env(safe-area-inset-top)); border-bottom: 2px solid var(--border); margin: 0 -16px 14px; padding-left: 12px; padding-right: 16px; }
.sub-top h2 { margin: 0; font-size: 20px; font-weight: 900; flex: 1; }
.sub-top .icon-btn { font-size: 24px; color: var(--text); }
.muted-p { color: var(--muted); font-weight: 600; line-height: 1.45; }
.end-panel { text-align: center; padding: 30px 0 60px; display: grid; gap: 10px; }
.end-panel h2 { margin: 6px 0 0; font-size: 26px; font-weight: 900; }

/* Casos */
.case-item { width: 100%; display: flex; align-items: center; gap: 12px; text-align: left; padding: 12px; margin-bottom: 10px; border-radius: var(--radius); border: 2px solid var(--border); box-shadow: 0 4px 0 var(--border); background: var(--surface); }
.case-item:active { transform: translateY(4px); box-shadow: none; }
.ci-ico { flex: none; width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; font-size: 24px; background: var(--c); }
.ci-txt { flex: 1; display: grid; }
.ci-txt small { color: var(--muted); font-weight: 700; font-size: 13px; }
.ci-st { font-size: 22px; }
.case-text { font-size: 17px; line-height: 1.5; font-weight: 700; }
textarea.case-code { min-height: 300px; font-size: 13.5px; line-height: 1.5; tab-size: 4; }
.case-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.case-btns .btn:only-child { grid-column: span 2; }
.btn.ghost-b { color: var(--blue); }
.case-tpl { margin-bottom: 10px; }
.case-tpl b, .case-result > b { display: block; margin: 6px 0; }
.case-result { margin-top: 18px; padding-bottom: 50px; }
.case-result h3 { font-size: 19px; font-weight: 900; margin: 0 0 8px; }
.checklist { list-style: none; padding: 0; margin: 0 0 8px; display: grid; gap: 6px; }
.checklist li { padding: 8px 12px; border-radius: 10px; font-weight: 700; }
.checklist li.ok { background: var(--green-bg); color: var(--green-d); }
.checklist li.miss { background: var(--surface-2); color: var(--muted); }
.tip { background: var(--surface-2); padding: 10px 12px; border-radius: 12px; font-weight: 700; line-height: 1.45; }
.rate-q { font-weight: 900; font-size: 17px; margin: 18px 0 8px; }
.rate-btns { display: grid; gap: 8px; }
ul.tips { margin: 0; padding-left: 20px; display: grid; gap: 6px; }

/* Tarjetas */
.chips { display: flex; gap: 8px; overflow-x: auto; padding: 2px 0 12px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip-topic { flex: none; padding: 7px 12px; border-radius: 99px; border: 2px solid var(--border); font-weight: 800; font-size: 13.5px; white-space: nowrap; }
.chip-topic.on { background: var(--blue); border-color: var(--blue); color: #fff; }
.flash-count { font-weight: 900; color: var(--muted); }
.card3d { position: relative; height: 330px; margin: 8px 0 10px; perspective: 1000px; transform-style: preserve-3d; transition: transform .45s cubic-bezier(.3,1.2,.5,1); touch-action: pan-y; cursor: pointer; user-select: none; }
.card3d.drag { transition: none; }
.card3d.flipped { transform: rotateY(180deg); }
.card3d.go-r { transform: translateX(130%) rotate(18deg) !important; opacity: 0; transition: transform .22s, opacity .22s; }
.card3d.go-l { transform: translateX(-130%) rotate(-18deg) !important; opacity: 0; transition: transform .22s, opacity .22s; }
.face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 22px; border: 2px solid var(--border); box-shadow: 0 6px 0 var(--border); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 22px; gap: 14px; font-size: 21px; font-weight: 800; line-height: 1.35; background: var(--surface); }
.face small { position: absolute; top: 14px; font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); font-weight: 900; }
.face em { position: absolute; bottom: 14px; font-size: 13px; color: var(--muted); font-style: normal; font-weight: 700; }
.face.back { transform: rotateY(180deg); background: var(--blue-bg); border-color: var(--blue); box-shadow: 0 6px 0 var(--blue); color: var(--blue-d); }
.face #flashBack { white-space: pre-line; }
.face #flashBack.mono { font-family: var(--mono); font-size: 15px; font-weight: 600; white-space: pre-wrap; }
.swipe-hint { text-align: center; color: var(--muted); font-weight: 700; font-size: 13.5px; margin: 6px 0 12px; }
.flash-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Relámpago */
.bolt-bar i { background: var(--yellow); transition: width .1s linear; }
.bolt-score { font-size: 20px; font-weight: 900; color: var(--yellow-d); }
#boltArea { padding-bottom: 40px; }

/* Progreso */
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat-grid div { border: 2px solid var(--border); border-radius: 14px; padding: 10px 6px; text-align: center; }
.stat-grid b { display: block; font-size: 20px; font-weight: 900; }
.stat-grid small { color: var(--muted); font-weight: 700; font-size: 12px; }
.weak { margin-top: 16px; background: var(--c); color: #fff; border-radius: var(--radius); padding: 14px; display: grid; gap: 10px; }
.weak small { font-weight: 800; opacity: .9; }
.weak b { display: block; font-size: 18px; font-weight: 900; }
.weak p { margin: 6px 0 0; font-weight: 700; }
.weak p code { background: rgba(255,255,255,.25); color: #fff; }
.weak .btn { background: #fff; color: var(--cd); border-color: #fff; box-shadow: 0 4px 0 rgba(0,0,0,.18); }
.topic-row { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; align-items: center; padding: 12px 0; border-bottom: 2px solid var(--border); }
.topic-row .tr-head { display: flex; justify-content: space-between; grid-column: 1; }
.topic-row .bar { grid-column: 1; height: 10px; }
.topic-row small { grid-column: 1; color: var(--muted); font-weight: 700; }
.mini-btn { grid-column: 2; grid-row: 1 / span 3; padding: 8px 12px; border-radius: 12px; border: 2px solid var(--border); box-shadow: 0 3px 0 var(--border); color: var(--blue); font-weight: 900; font-size: 13px; text-transform: uppercase; }

/* ================= Modo Express ================= */
.express-card {
  width: 100%; margin-top: 16px; display: flex; align-items: center; gap: 14px; text-align: left;
  padding: 16px; border-radius: 20px; color: #fff;
  background: linear-gradient(135deg, #ce82ff, #1cb0f6);
  box-shadow: 0 5px 0 #8a5cc2;
}
.express-card:active { transform: translateY(5px); box-shadow: none; }
.express-card .ex-ico { font-size: 38px; width: 60px; height: 60px; flex: none; display: grid; place-items: center; border-radius: 16px; background: rgba(255,255,255,.22); animation: bounce 1.2s infinite alternate; }
.express-card b { display: block; font-size: 20px; font-weight: 900; }
.express-card small { display: block; font-weight: 700; opacity: .95; }
.express-card em { display: inline-block; margin-top: 6px; font-style: normal; font-weight: 800; font-size: 12.5px; background: rgba(0,0,0,.18); padding: 3px 8px; border-radius: 99px; }

.plan { border: 2px solid var(--border); border-radius: var(--radius); padding: 12px; display: grid; gap: 8px; margin: 4px 0 14px; }
.plan-head { font-weight: 800; line-height: 1.4; }
.plan-head b { color: var(--red); }
.plan-day { background: var(--surface-2); border-radius: 12px; padding: 10px 12px; font-weight: 700; line-height: 1.45; }
.plan-day b { display: block; color: var(--purple-d); font-weight: 900; font-size: 13px; text-transform: uppercase; letter-spacing: .5px; }
.plan-day.last b { color: var(--yellow-d); }
.plan-day.ok { background: var(--green-bg); color: var(--green-d); }
.case-item.done { opacity: .75; }

.exam-steps { margin: 0 0 16px; padding-left: 22px; display: grid; gap: 8px; font-weight: 700; line-height: 1.45; }
.sum-card { border: 2px solid var(--c); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 14px; }
.sum-card h3 { margin: 0 0 6px; font-size: 19px; font-weight: 900; }
.sum-card p { margin: 0 0 8px; font-weight: 600; line-height: 1.45; }
.sum-card .sig { background: var(--blue-bg); padding: 8px 10px; border-radius: 10px; }
.sum-card .trap { background: var(--red-bg); padding: 8px 10px; border-radius: 10px; }
.sum-card pre.code { font-size: 12.5px; margin-bottom: 8px; }

/* ================= Construye paso a paso ================= */
.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 12px; }
.level { padding: 10px 6px; border-radius: 14px; border: 2px solid var(--border); box-shadow: 0 3px 0 var(--border); text-align: center; display: grid; gap: 2px; }
.level b { font-size: 13.5px; font-weight: 900; }
.level small { font-size: 11px; color: var(--muted); font-weight: 700; line-height: 1.25; }
.level.on { border-color: var(--purple); background: color-mix(in srgb, var(--purple) 14%, transparent); box-shadow: 0 3px 0 var(--purple-d); }
.level.on b { color: var(--purple-d); }
.lv-marks { font-size: 15px; letter-spacing: 1px; white-space: nowrap; }
.plan-day.morning { background: var(--blue-bg); }
.plan-day.morning b { color: var(--blue-d); }

.build-bar { margin: 4px 0 14px; }
.build-bar i { background: var(--purple); }
.code-label { display: block; margin-bottom: 6px; color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .5px; }
.build-code { min-height: 60px; }
.step-card { border: 2px solid var(--purple); border-radius: 18px; padding: 14px; margin-bottom: 40vh; box-shadow: 0 4px 0 var(--purple-d); animation: up .25s ease-out; }
.step-n { color: var(--purple-d); font-weight: 900; text-transform: uppercase; letter-spacing: .6px; font-size: 12px; }
.step-say { font-size: 19px; font-weight: 800; margin: 4px 0 10px; line-height: 1.35; }
.step-hint { font-family: var(--mono); font-size: 13px; font-weight: 600; background: var(--surface-2); padding: 8px 10px; border-radius: 10px; margin-bottom: 10px; color: var(--muted); word-break: break-word; }
.step-input { width: 100%; font: 600 15px var(--mono); color: var(--text); background: var(--code-bg); border: 2px solid var(--border); border-radius: 12px; padding: 12px; outline: none; }
.step-input:focus { border-color: var(--purple); }
.step-input.shake { animation: shake .35s; border-color: var(--red); }
.step-fb { margin-top: 10px; font-weight: 700; }
.step-fb.bad { color: var(--red-d); background: var(--red-bg); padding: 10px; border-radius: 12px; }
.step-fb pre { font: 600 13.5px var(--mono); white-space: pre-wrap; margin: 6px 0; color: var(--text); background: var(--surface); padding: 8px 10px; border-radius: 8px; }
.step-fb span { font-size: 13.5px; }
.step-btns { display: grid; grid-template-columns: 1fr 1.4fr; gap: 10px; margin-top: 12px; }
.checklist li code { display: inline-block; margin-top: 4px; white-space: pre-wrap; }