:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --text: #14213d;
  --muted: #667085;
  --border: #e5eaf2;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --shadow: 0 18px 50px rgba(20, 33, 61, .08);
}
[data-theme="dark"] {
  --bg: #0d1424;
  --surface: #151f33;
  --surface-soft: #1b315a;
  --text: #f3f6ff;
  --muted: #aab5ca;
  --border: #293750;
  --shadow: 0 18px 50px rgba(0,0,0,.22);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button { font: inherit; cursor: pointer; }
button:focus-visible { outline: 3px solid rgba(37,99,235,.35); outline-offset: 3px; }
.app-shell { min-height: 100vh; }
.topbar {
  height: 72px; display: flex; align-items: center; justify-content: space-between;
  padding: 0 6%; border-bottom: 1px solid var(--border); background: var(--surface);
}
.brand { display: flex; gap: 10px; align-items: center; font-weight: 800; font-size: 20px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 11px; display: grid; place-items: center;
  background: var(--primary); color: white; font-weight: 900;
}
.nav { display: flex; gap: 8px; align-items: center; }
.nav button, .icon-btn {
  border: 0; background: transparent; color: var(--muted); padding: 10px 12px; border-radius: 10px;
}
.nav button.active, .nav button:hover, .icon-btn:hover { background: var(--surface-soft); color: var(--primary); }
.icon-btn { font-size: 18px; }
main { max-width: 1180px; margin: 0 auto; padding: 42px 24px 70px; }
.hero { display: grid; grid-template-columns: 1.25fr .75fr; gap: 28px; align-items: stretch; }
.eyebrow { color: var(--primary); font-weight: 750; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
h1 { font-size: clamp(36px, 5vw, 62px); line-height: 1.02; letter-spacing: -.045em; margin: 14px 0 18px; max-width: 720px; }
h2 { margin: 0; font-size: 25px; letter-spacing: -.025em; }
h3 { margin: 0; font-size: 17px; }
p { color: var(--muted); line-height: 1.65; }
.hero-copy p { max-width: 590px; font-size: 17px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 24px;
  box-shadow: var(--shadow);
}
.hero-card { padding: 26px; display: flex; flex-direction: column; justify-content: space-between; }
.stat-row { display: flex; gap: 12px; margin-top: 24px; }
.stat { flex: 1; padding: 16px; border-radius: 16px; background: var(--surface-soft); }
.stat strong { display: block; font-size: 24px; }
.stat span { font-size: 12px; color: var(--muted); }
.btn {
  border: 0; border-radius: 13px; padding: 13px 18px; font-weight: 750;
  transition: transform .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { color: white; background: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { color: var(--text); background: var(--surface-soft); }
.btn-ghost { color: var(--primary); background: transparent; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 25px; }
.section-head { display: flex; justify-content: space-between; gap: 16px; align-items: end; margin: 48px 0 18px; }
.section-head p { margin: 6px 0 0; }
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.topic-card { padding: 20px; cursor: pointer; box-shadow: none; transition: border-color .15s, transform .15s; }
.topic-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.topic-icon { font-size: 26px; margin-bottom: 22px; }
.topic-card p { font-size: 14px; margin-bottom: 0; }
.practice-wrap { max-width: 780px; margin: 0 auto; }
.back-link { border: 0; background: transparent; color: var(--muted); padding: 0; margin-bottom: 24px; }
.practice-card { padding: clamp(22px, 5vw, 42px); text-align: center; }
.topic-label { color: var(--primary); font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.topic-question { font-size: clamp(26px, 4vw, 42px); line-height: 1.12; letter-spacing: -.035em; margin: 16px auto 26px; max-width: 650px; }
.timer {
  width: 170px; height: 170px; border-radius: 50%; margin: 30px auto;
  display: grid; place-items: center; border: 10px solid var(--surface-soft);
  box-shadow: inset 0 0 0 2px var(--border);
}
.timer strong { font-size: 43px; letter-spacing: -.06em; }
.timer small { display: block; color: var(--muted); font-size: 12px; }
.status { color: var(--muted); font-size: 14px; min-height: 22px; }
.mic {
  width: 74px; height: 74px; border-radius: 50%; border: 0; background: var(--primary);
  color: white; font-size: 30px; margin: 10px auto 0;
}
.mic.recording { background: var(--danger); animation: pulse 1.4s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 13px rgba(220,38,38,.12); } }
.progress { height: 8px; border-radius: 99px; background: var(--border); overflow: hidden; margin: 20px 0; }
.progress span { display: block; height: 100%; background: var(--primary); width: 0%; transition: width .3s; }
.score-hero { padding: 28px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.score-circle { width: 116px; height: 116px; border-radius: 50%; background: var(--surface-soft); display: grid; place-items: center; text-align: center; }
.score-circle strong { display: block; font-size: 37px; }
.score-circle span { font-size: 11px; color: var(--muted); }
.score-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 18px; }
.score-card { padding: 18px; box-shadow: none; }
.score-card strong { font-size: 28px; display: block; margin: 10px 0; }
.score-card small { color: var(--muted); }
.score-card .progress { margin: 10px 0 0; height: 6px; }
.feedback-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 18px; }
.panel { padding: 24px; }
.panel ul { padding-left: 20px; color: var(--muted); line-height: 1.8; }
.history-list { display: grid; gap: 12px; }
.history-item { padding: 18px 20px; display: flex; justify-content: space-between; align-items: center; gap: 15px; }
.history-item p { margin: 5px 0 0; font-size: 13px; }
.pill { display: inline-flex; border-radius: 99px; padding: 6px 10px; background: var(--surface-soft); color: var(--primary); font-size: 12px; font-weight: 750; }
.empty { padding: 55px 20px; text-align: center; }
.setting { padding: 20px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.toggle { width: 48px; height: 28px; border-radius: 99px; border: 0; background: var(--border); padding: 3px; }
.toggle span { display: block; width: 22px; height: 22px; border-radius: 50%; background: white; transition: transform .2s; }
.toggle.on { background: var(--primary); }
.toggle.on span { transform: translateX(20px); }
.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 30px; }
@media (max-width: 800px) {
  .topbar { padding: 0 18px; }
  .nav button { font-size: 12px; padding: 8px; }
  main { padding: 28px 16px 50px; }
  .hero, .feedback-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .score-grid { grid-template-columns: repeat(2, 1fr); }
  .score-hero { align-items: flex-start; }
}
@media (max-width: 420px) {
  .brand { font-size: 17px; }
  .nav button { padding: 7px 5px; }
  .score-hero { flex-direction: column-reverse; }
  .score-circle { width: 100px; height: 100px; }
}
.transcript-box{margin-top:20px;padding:16px;border:1px solid var(--border);border-radius:14px;background:var(--surface-soft)}
.transcript-box p{margin:10px 0 0;line-height:1.6;min-height:28px}
.row-between{display:flex;justify-content:space-between;align-items:center;gap:12px}
.transcript-text{line-height:1.7;white-space:pre-wrap}
.muted{color:var(--muted)}

.history-button{width:100%;text-align:left;display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:16px;cursor:pointer;color:inherit}
.history-button:hover{transform:translateY(-1px)}
.history-arrow{font-size:20px;color:var(--muted)}

/* Final visual polish */
.topbar{position:sticky;top:0;z-index:20;backdrop-filter:blur(14px);background:color-mix(in srgb,var(--surface) 88%,transparent)}
.brand-mark{display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(37,99,235,.22)}
.nav{background:var(--bg);padding:5px;border:1px solid var(--border);border-radius:15px}
.nav button{font-weight:700}
.nav button.active{background:var(--surface);box-shadow:0 3px 12px rgba(20,33,61,.08)}
.hero-copy{padding:18px 0}
.hero-card{background:linear-gradient(145deg,var(--surface),var(--surface-soft))}
.topic-card{position:relative;overflow:hidden}
.topic-card:after{content:"";position:absolute;right:-35px;top:-35px;width:110px;height:110px;border-radius:50%;background:var(--surface-soft);opacity:.7;pointer-events:none}
.topic-icon{position:relative;z-index:1}
@media(max-width:800px){.topbar{height:auto;min-height:72px;gap:10px;flex-wrap:wrap;padding:12px 16px}.nav{width:100%;justify-content:space-between}.nav button{flex:1}.hero-copy{padding-top:4px}}
/* SpeakSprint final polish */
.topbar{position:sticky;top:0;z-index:20;backdrop-filter:blur(14px);background:color-mix(in srgb,var(--surface) 90%,transparent)}
.brand-mark{display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(37,99,235,.22)}
.nav{background:var(--bg);padding:5px;border:1px solid var(--border);border-radius:15px}
.nav button{font-weight:700}
.nav button.active{background:var(--surface);box-shadow:0 3px 12px rgba(20,33,61,.08)}
.hero-copy{padding:18px 0}
.hero-card{background:linear-gradient(145deg,var(--surface),var(--surface-soft))}
.topic-card{position:relative;overflow:hidden}
.topic-card:after{content:"";position:absolute;right:-35px;top:-35px;width:110px;height:110px;border-radius:50%;background:var(--surface-soft);opacity:.7;pointer-events:none}
.topic-icon{position:relative;z-index:1}
@media(max-width:800px){.topbar{height:auto;min-height:72px;gap:10px;flex-wrap:wrap;padding:12px 16px}.nav{width:100%;justify-content:space-between}.nav button{flex:1}.hero-copy{padding-top:4px}}