/* english-dojo — M1. Design tokens from PLAN.md §8 (Duolingo CSS variables).
   Green #5CCC04, body text #485A62, streak orange #FF9600.
   Font: Nunito (rounded, free), self-hosted woff2 — same pattern as
   Inter self-hosted in practice-questions. */

@font-face {
  font-family: 'Nunito';
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url('/static/fonts/nunito-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Nunito';
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url('/static/fonts/nunito-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB,
    U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --green: #5ccc04;
  --green-dark: #46a302; /* darker strip under primary buttons */
  --green-pale: #d7ffb8;
  --text: #485a62;
  --blue: #1453a3;
  --sky: #048fd1;
  --teal: #007c8f;
  --teal-progress: #00c696;
  --pale-yellow: #fbdf6d;
  --pale: #fff5d3;
  --pale-pink: #ffdfe0;
  --light-green: #a5ed6e;
  --grey: #777777;
  --gold: #f4b811;
  --dark-gold: #cd7900;
  --orange: #ff9600; /* streak flame */
  --frozen-blue: #ddf4ff;
  --border: #e5e5e5;
  --white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Nunito', 'Trebuchet MS', 'Segoe UI', system-ui, sans-serif;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.18;
  color: var(--text);
  background: var(--white);
}

h1, h2, h3 { font-weight: 700; }

a { color: var(--sky); }

/* ---- header ---- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
  padding: 18px 24px;
}
.wordmark {
  font-size: 24px;
  font-weight: 800;
  color: var(--green);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.wordmark.big { font-size: 32px; }
.streak {
  font-size: 18px;
  font-weight: 800;
  color: var(--orange);
}

/* ---- layout ---- */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 24px 48px;
}

/* ---- buttons: pill, uppercase, chunky bottom strip (PLAN §8) ---- */
.btn {
  display: inline-block;
  border-radius: 16px;
  padding: 14px 24px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--green);
  color: #fff;
  box-shadow: 0 4px 0 var(--green-dark);
}
.btn-primary:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--green-dark); }
.btn-secondary {
  background: var(--white);
  color: var(--sky);
  border: 2px solid var(--border);
}
.btn-block { display: block; width: 100%; }

/* ---- login ---- */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--pale);
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 4px 0 var(--border);
  padding: 32px 28px;
}
.login-sub { color: var(--grey); margin: 6px 0 24px; }
.login-card label {
  display: block;
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 16px;
}
.login-card input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 17px;
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: 16px;
  background: #f7f7f7;
}
.login-card input:focus { outline: none; border-color: var(--sky); background: var(--white); }
.error {
  background: var(--pale-pink);
  border-radius: 16px;
  padding: 12px 16px;
  font-weight: 700;
}

/* ---- learning path ---- */
.path-head h1 { font-size: 32px; margin: 12px 0 6px; }
.path-sub { color: var(--grey); margin: 0 0 6px; }
.m1-note {
  display: inline-block;
  background: var(--frozen-blue);
  border-radius: 16px;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 700;
}
.path { margin-top: 24px; }
.unit { margin-bottom: 36px; }
.unit-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 4px 0 var(--border);
  padding: 20px 22px;
}
.unit-card h2 { font-size: 20px; margin: 4px 0 6px; }
.unit-num {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--green);
}
.unit-grammar { margin: 0; color: var(--grey); font-size: 15px; }
.node-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  padding-left: 12px;
}
/* winding path: alternate the node side per unit */
.unit:nth-child(even) .node-row { justify-content: flex-end; padding-left: 0; padding-right: 12px; }
.node {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  background: #e5e5e5;
  color: var(--grey);
  border: 2px solid #d4d4d4;
  box-shadow: 0 4px 0 #d4d4d4;
}
.node-start {
  background: var(--green);
  color: #fff;
  border-color: var(--green-dark);
  box-shadow: 0 4px 0 var(--green-dark);
}
.node-label { font-weight: 700; color: var(--grey); }
.node-open .node-label { color: var(--green); }
.path-foot { text-align: center; margin-top: 12px; }

/* ---- lesson (M2) ---- */
.freeze { font-size: 18px; font-weight: 800; color: var(--sky); margin-left: 8px; }
.back-link { font-weight: 700; text-decoration: none; }
.lesson-head h1 { font-size: 32px; margin: 12px 0 6px; }
.lesson-struct { color: var(--grey); margin: 0 0 6px; font-weight: 700; }
.lesson-note {
  background: var(--pale);
  border-radius: 16px;
  padding: 12px 16px;
  font-size: 15px;
}
.progress-bar {
  height: 12px;
  background: var(--border);
  border-radius: 16px;
  overflow: hidden;
  margin-top: 16px;
}
.progress-fill { height: 100%; background: var(--teal-progress); border-radius: 16px; }
.progress-text { color: var(--grey); font-size: 15px; font-weight: 700; }
.item-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 4px 0 var(--border);
  padding: 24px 22px;
  margin-top: 16px;
}
.step-label {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 12px;
}
.item-prompt { font-size: 20px; font-weight: 700; margin: 0 0 16px; }
.prompt-id { font-size: 20px; font-weight: 700; margin: 0 0 16px; }
.item-hint { color: var(--grey); font-size: 15px; }
.cue { font-size: 17px; }
.cue code {
  background: var(--pale);
  border-radius: 8px;
  padding: 2px 8px;
  font-family: inherit;
  font-weight: 700;
}
.reveal-note {
  background: var(--pale);
  border-radius: 16px;
  padding: 12px 16px;
}
.unaided-tag {
  display: inline-block;
  background: var(--pale-yellow);
  border-radius: 16px;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.speak-text { font-size: 22px; font-weight: 800; margin: 0 0 16px; }
.choice-list { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }
.btn-choice {
  background: var(--white);
  color: var(--text);
  border: 2px solid var(--border);
  text-transform: none;
  letter-spacing: 0;
  text-align: left;
  width: 100%;
}
.btn-choice:hover { border-color: var(--sky); }
.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.chip {
  font-family: inherit;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 10px 16px;
  cursor: pointer;
  box-shadow: 0 3px 0 var(--border);
}
.chip:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--border); }
.answer-area {
  min-height: 56px;
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}
.answer-hint { color: var(--grey); font-weight: 700; }
.type-input {
  display: block;
  width: 100%;
  margin: 8px 0 16px;
  padding: 14px;
  font-family: inherit;
  font-size: 17px;
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: 16px;
  background: #f7f7f7;
}
.type-input:focus { outline: none; border-color: var(--sky); background: var(--white); }
.recorder { display: flex; gap: 12px; align-items: center; margin: 16px 0; flex-wrap: wrap; }
.feedback { border-radius: 16px; padding: 16px 20px; margin: 16px 0; }
.feedback-ok { background: var(--green-pale); }
.feedback-bad { background: var(--pale-pink); }
.feedback-title { font-size: 20px; font-weight: 800; margin: 0 0 6px; }
.typo-note { font-weight: 700; }
.done-card h1 { font-size: 32px; margin: 0 0 8px; }
.done-line { font-size: 18px; font-weight: 700; }
.done-streak { font-weight: 800; color: var(--orange); }
.lesson-nodes { margin-top: 12px; display: flex; flex-direction: column; gap: 10px; }
.lesson-node-row { display: flex; align-items: center; gap: 12px; padding-left: 12px; }
.lesson-node-row .node { width: 48px; height: 48px; font-size: 18px; text-decoration: none; }
.node-done { background: var(--green); color: #fff; border-color: var(--green-dark); box-shadow: 0 4px 0 var(--green-dark); }