:root {
  --bg-0: #030714;
  --bg-1: #081426;
  --panel: rgba(12, 24, 45, 0.78);
  --panel-strong: rgba(11, 23, 43, 0.92);
  --panel-border: rgba(148, 163, 184, 0.2);
  --panel-glow: rgba(56, 189, 248, 0.18);
  --gold: #f5c56f;
  --gold-strong: #ffd88a;
  --blue: #38bdf8;
  --blue-strong: #60a5fa;
  --purple: #8b5cf6;
  --green: #34d399;
  --amber: #fbbf24;
  --red: #fb7185;
  --text: #eef6ff;
  --muted: #a9b7ca;
  --soft: rgba(226, 232, 240, 0.72);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.46);
  --radius: 28px;
  --radius-sm: 18px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font);
  background:
    radial-gradient(circle at 20% 8%, rgba(56, 189, 248, 0.2), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(245, 197, 111, 0.13), transparent 26%),
    radial-gradient(circle at 50% 100%, rgba(139, 92, 246, 0.14), transparent 38%),
    linear-gradient(145deg, var(--bg-0), var(--bg-1) 52%, #050b19);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at center, black, transparent 74%);
}

button,
textarea,
input { font: inherit; }

button { cursor: pointer; }

button:disabled { cursor: not-allowed; opacity: 0.62; }
[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-shell {
  width: min(1560px, calc(100vw - 44px));
  margin: 0 auto;
  padding: 24px 0 38px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
  padding: 14px 16px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 24px;
  background: rgba(6, 15, 29, 0.7);
  backdrop-filter: blur(22px);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.32);
}

.brand,
.topbar-link,
.topbar-module-chip {
  color: inherit;
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
}

.brand-wave,
.tt-title-wave,
.panel-heading-wave,
.listening-visual,
.answer-empty-wave {
  display: inline-flex;
  align-items: end;
  gap: 3px;
}

.brand-wave span,
.tt-title-wave span,
.panel-heading-wave span,
.listening-visual span,
.answer-empty-wave span {
  display: block;
  width: 4px;
  border-radius: 999px;
  background: var(--blue);
  animation: wavePulse 1.5s ease-in-out infinite;
}

.brand-wave span:nth-child(1) { height: 13px; }
.brand-wave span:nth-child(2) { height: 21px; animation-delay: .08s; background: var(--blue-strong); }
.brand-wave span:nth-child(3) { height: 30px; animation-delay: .16s; background: var(--gold); }
.brand-wave span:nth-child(4) { height: 39px; animation-delay: .24s; background: var(--purple); }
.brand-wave span:nth-child(5) { height: 28px; animation-delay: .32s; background: var(--blue); }
.brand-wave span:nth-child(6) { height: 18px; animation-delay: .40s; background: var(--gold); }
.brand-wave span:nth-child(7) { height: 25px; animation-delay: .48s; background: var(--blue-strong); }

.wordmark,
.mini-wordmark {
  letter-spacing: -0.04em;
  font-weight: 900;
}

.wordmark { font-size: 1.42rem; }
.wordmark-echo,
.mini-wordmark-echo { color: #f8fbff; }
.wordmark-aural,
.mini-wordmark-aural {
  background: linear-gradient(135deg, var(--gold), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.topbar-link,
.topbar-module-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(15, 23, 42, 0.55);
  color: var(--soft);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.topbar-link { padding: 0 15px; font-size: .9rem; font-weight: 750; }
.topbar-module-chip { gap: 9px; padding: 5px 13px 5px 8px; }
.topbar-link:hover,
.topbar-module-chip:hover { transform: translateY(-1px); border-color: rgba(245, 197, 111, 0.5); background: rgba(30, 41, 59, 0.72); }

.topbar-module-icon,
.tt-hero-icon,
.console-tt-icon,
.answer-empty-icon {
  display: inline-grid;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(145deg, rgba(245, 197, 111, 0.16), rgba(56, 189, 248, 0.14));
  border: 1px solid rgba(245, 197, 111, 0.28);
  box-shadow: inset 0 0 20px rgba(255,255,255,0.05), 0 14px 34px rgba(0,0,0,0.24);
}

.topbar-module-icon { width: 34px; height: 34px; }
.topbar-module-icon img { width: 22px; height: 22px; object-fit: contain; }
.topbar-module-icon img,
.tt-hero-icon img,
.console-tt-icon img,
.answer-empty-icon img {
  filter: brightness(0) invert(1) drop-shadow(0 0 8px rgba(56, 189, 248, .16));
}
.topbar-tt-mark { font-weight: 950; letter-spacing: -0.08em; font-size: 1.05rem; }
.topbar-tt-gradient { color: var(--gold); }
.back-label { color: var(--muted); margin-right: 4px; }

.three-panel-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.86fr) minmax(430px, 1.36fr) minmax(280px, 0.92fr);
  gap: 18px;
  align-items: stretch;
}

.panel {
  position: relative;
  min-height: 740px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.075), transparent 28%),
    var(--panel);
  backdrop-filter: blur(26px);
  box-shadow: var(--shadow);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  background: radial-gradient(circle at 50% 0%, var(--panel-glow), transparent 48%);
  opacity: .86;
}

.setup-panel,
.quiz-panel,
.info-panel {
  padding: 22px;
}

.quiz-panel { min-height: 780px; }

.panel > * { position: relative; z-index: 1; }

.panel-section-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.panel-section-heading-centre { justify-content: center; }
.panel-section-heading h2 { margin: 0; font-size: .82rem; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }
.panel-section-heading h2 span { color: var(--soft); }
.panel-heading-wave span { width: 4px; }
.panel-heading-wave span:nth-child(1) { height: 12px; }
.panel-heading-wave span:nth-child(2) { height: 22px; animation-delay: .12s; background: var(--gold); }
.panel-heading-wave span:nth-child(3) { height: 15px; animation-delay: .24s; background: var(--purple); }

.panel-hero {
  padding: 20px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 24px;
  background:
    radial-gradient(circle at 18% 0%, rgba(56, 189, 248, 0.16), transparent 45%),
    rgba(5, 13, 27, 0.55);
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold-strong);
  font-weight: 900;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.tt-hero-lockup {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.tt-hero-icon { width: 64px; height: 64px; flex: 0 0 auto; }
.tt-hero-icon img { width: 42px; height: 42px; object-fit: contain; }

.tt-title-lockup { display: flex; align-items: center; gap: 12px; }
.tt-title-wave span { width: 4px; }
.tt-title-wave span:nth-child(1) { height: 10px; }
.tt-title-wave span:nth-child(2) { height: 18px; animation-delay: .1s; background: var(--blue-strong); }
.tt-title-wave span:nth-child(3) { height: 26px; animation-delay: .2s; background: var(--gold); }
.tt-title-wave span:nth-child(4) { height: 16px; animation-delay: .3s; background: var(--purple); }
.tt-title-wave span:nth-child(5) { height: 12px; animation-delay: .4s; background: var(--red); }

.tt-title-text,
.console-title-text {
  display: grid;
  line-height: .9;
  font-weight: 950;
  letter-spacing: -0.055em;
}

.tt-title-main,
.console-title-main { font-size: clamp(1.45rem, 2vw, 2.15rem); color: #f8fbff; }
.tt-title-gradient,
.console-title-gradient {
  font-size: clamp(1.45rem, 2vw, 2.15rem);
  background: linear-gradient(135deg, var(--gold), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tt-panel-intro,
.exam-note-card p,
.muted { color: var(--muted); line-height: 1.55; }
.tt-panel-intro { margin: 0; }

.setup-panel > h2 {
  margin: 0 0 12px;
  font-size: .9rem;
  color: var(--soft);
  text-transform: uppercase;
  letter-spacing: .15em;
}

.focus-card-grid { display: grid; gap: 10px; margin-bottom: 16px; }
.focus-card,
.exam-note-card {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.55);
  padding: 14px;
}
.focus-card { display: grid; gap: 5px; }
.focus-card strong { color: #fff7e6; font-size: .94rem; }
.focus-card span { color: var(--muted); font-size: .88rem; line-height: 1.4; }
.exam-note-card { margin: 18px 0; }
.exam-note-card p:last-child { margin: 0; font-size: .9rem; }

.primary-button,
.secondary-button,
.play-button {
  border: 0;
  border-radius: 999px;
  min-height: 46px;
  padding: 0 22px;
  font-weight: 900;
  letter-spacing: .01em;
  color: #06101f;
  background: linear-gradient(135deg, var(--gold), var(--blue));
  box-shadow: 0 16px 38px rgba(56, 189, 248, 0.18), 0 10px 26px rgba(245, 197, 111, 0.13);
  transition: transform .18s ease, filter .18s ease;
}
.primary-button:hover,
.secondary-button:hover,
.play-button:hover { transform: translateY(-1px); filter: brightness(1.06); }
.secondary-button {
  color: var(--soft);
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: none;
}
.play-button { width: max-content; justify-self: center; }

.quiz-header { display: grid; gap: 10px; margin-bottom: 12px; }
.quiz-header p { margin: 0; text-align: center; color: var(--soft); font-weight: 900; }
.progressOuter {
  overflow: hidden;
  height: 9px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.14);
  border: 1px solid rgba(148, 163, 184, 0.16);
}
#progressInner {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold), var(--blue), var(--purple));
  transition: width .35s ease;
}
.statsRow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 15px;
}
.statsRow p {
  margin: 0;
  padding: 9px 10px;
  border-radius: 999px;
  text-align: center;
  font-size: .82rem;
  color: var(--soft);
  font-weight: 850;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.15);
}

.listening-console {
  position: relative;
  display: grid;
  align-content: center;
  gap: 18px;
  min-height: 640px;
  padding: 28px;
  border-radius: 30px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background:
    radial-gradient(circle at 50% 12%, rgba(56, 189, 248, 0.18), transparent 38%),
    radial-gradient(circle at 52% 50%, rgba(245, 197, 111, 0.12), transparent 34%),
    rgba(5, 13, 27, 0.64);
  overflow: hidden;
}

.console-orbit {
  position: absolute;
  inset: 48px;
  border: 1px solid rgba(245, 197, 111, 0.12);
  border-radius: 999px;
  opacity: .5;
}

.console-ready-brand,
.console-question-kicker,
.listening-visual,
.console-heading,
.response-area,
.listening-cues,
#feedback,
.console-actions { position: relative; z-index: 1; }

.console-ready-brand { display: grid; justify-items: center; gap: 14px; }
.console-tt-combined-lockup { display: flex; align-items: center; gap: 16px; }
.console-tt-icon { width: 76px; height: 76px; }
.console-tt-icon img { width: 50px; height: 50px; }
.console-tt-icon.missing-console-icon::before,
.tt-hero-icon.missing-tt-icon::before,
.topbar-module-icon.missing-topbar-icon::before,
.answer-empty-icon.missing-answer-icon::before { content: "TT"; font-weight: 950; color: var(--gold); }

.console-question-kicker { text-align: center; }
.quiz-panel.is-ready .active-only { opacity: 0; }
.quiz-panel.is-active .console-ready-brand { transform: scale(.72); opacity: .46; }
.quiz-panel.is-active .listening-console { align-content: start; }
.quiz-panel.is-complete .response-area { display: none; }

.listening-visual {
  justify-content: center;
  min-height: 86px;
  padding: 8px 0;
}
.listening-visual span {
  width: 10px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--gold), var(--blue));
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.2);
}
.listening-visual span:nth-child(1) { height: 26px; }
.listening-visual span:nth-child(2) { height: 46px; animation-delay: .06s; }
.listening-visual span:nth-child(3) { height: 72px; animation-delay: .12s; }
.listening-visual span:nth-child(4) { height: 55px; animation-delay: .18s; }
.listening-visual span:nth-child(5) { height: 86px; animation-delay: .24s; }
.listening-visual span:nth-child(6) { height: 38px; animation-delay: .30s; }
.listening-visual span:nth-child(7) { height: 64px; animation-delay: .36s; }
.listening-visual span:nth-child(8) { height: 78px; animation-delay: .42s; }
.listening-visual span:nth-child(9) { height: 48px; animation-delay: .48s; }
.listening-visual span:nth-child(10) { height: 32px; animation-delay: .54s; }
.listening-visual span:nth-child(11) { height: 58px; animation-delay: .60s; }

.console-heading { text-align: center; display: grid; gap: 10px; max-width: 820px; margin: 0 auto; }
.question-title { margin: 0; color: var(--gold-strong); font-weight: 900; letter-spacing: .08em; text-transform: uppercase; font-size: .78rem; }
.exam-prompt-line {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.console-heading h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2.4vw, 2.35rem);
  line-height: 1.05;
  letter-spacing: -0.055em;
}
.question-marks {
  display: inline-grid;
  place-items: center;
  min-width: 48px;
  min-height: 42px;
  padding: 4px 10px;
  border-radius: 14px;
  border: 1px solid rgba(245, 197, 111, 0.34);
  background: rgba(245, 197, 111, 0.08);
  color: var(--gold-strong);
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  font-weight: 950;
  letter-spacing: -0.02em;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08), 0 12px 28px rgba(0,0,0,0.18);
}
.question-marks[hidden] { display: none; }
.console-actions-start { display: grid; justify-items: center; }
.centre-start { min-width: 220px; min-height: 54px; }

.response-area {
  display: grid;
  gap: 12px;
  width: min(680px, 100%);
  margin: 0 auto;
}
.answer-label {
  color: var(--soft);
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 900;
}
textarea {
  width: 100%;
  resize: vertical;
  min-height: 128px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 22px;
  outline: none;
  padding: 16px 17px;
  color: var(--text);
  background: rgba(2, 6, 23, 0.62);
  box-shadow: inset 0 0 28px rgba(0,0,0,0.18);
  line-height: 1.5;
}
textarea:focus {
  border-color: rgba(245, 197, 111, 0.55);
  box-shadow: 0 0 0 4px rgba(245, 197, 111, 0.1), inset 0 0 28px rgba(0,0,0,0.18);
}
textarea::placeholder { color: rgba(169, 183, 202, 0.65); }
.response-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.listening-cues {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.listening-cues span {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 999px;
  padding: 7px 11px;
  color: var(--muted);
  background: rgba(15, 23, 42, 0.52);
  font-size: .78rem;
  font-weight: 800;
}

#feedback {
  min-height: 24px;
  margin: 0;
  text-align: center;
  color: var(--muted);
  line-height: 1.45;
  font-weight: 750;
}
.good { color: var(--green) !important; }
.partial { color: var(--amber) !important; }
.bad { color: var(--red) !important; }

.answerCard {
  height: calc(100% - 46px);
  display: grid;
}
.answerCard-empty,
.answer-reveal,
.round-summary-card {
  min-height: 660px;
  border-radius: 24px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background:
    radial-gradient(circle at 50% 0%, rgba(245, 197, 111, 0.11), transparent 42%),
    rgba(5, 13, 27, 0.58);
  padding: 22px;
}
.answerCard-empty {
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  gap: 12px;
}
.answer-empty-brand { display: grid; justify-items: center; gap: 12px; margin-bottom: 8px; }
.answer-empty-icon { width: 70px; height: 70px; }
.answer-empty-icon img { width: 46px; height: 46px; }
.answer-empty-wave span { width: 4px; }
.answer-empty-wave span:nth-child(1) { height: 12px; }
.answer-empty-wave span:nth-child(2) { height: 24px; background: var(--blue-strong); animation-delay: .1s; }
.answer-empty-wave span:nth-child(3) { height: 34px; background: var(--gold); animation-delay: .2s; }
.answer-empty-wave span:nth-child(4) { height: 22px; background: var(--purple); animation-delay: .3s; }
.answer-empty-wave span:nth-child(5) { height: 16px; background: var(--red); animation-delay: .4s; }
.answerCard-empty h2,
.answer-reveal h2,
.round-summary-card h2 { margin: 0; letter-spacing: -0.045em; line-height: 1.06; }
.answerCard-empty p { margin: 0; max-width: 30ch; }

.answer-reveal { display: grid; gap: 16px; align-content: start; }
.answer-reveal.is-correct { border-color: rgba(52, 211, 153, 0.32); }
.answer-reveal.is-partial { border-color: rgba(251, 191, 36, 0.34); }
.answer-reveal.is-incorrect { border-color: rgba(251, 113, 133, 0.32); }
.answer-status-line { display: flex; align-items: center; gap: 10px; }
.answer-status-line p { margin: 0; font-weight: 950; text-transform: uppercase; letter-spacing: .15em; font-size: .75rem; }
.answer-status-dot { width: 10px; height: 10px; border-radius: 50%; background: currentColor; box-shadow: 0 0 18px currentColor; }
.answer-reveal.is-correct .answer-status-dot { color: var(--green); }
.answer-reveal.is-partial .answer-status-dot { color: var(--amber); }
.answer-reveal.is-incorrect .answer-status-dot { color: var(--red); }
.answer-title-block h2 { font-size: clamp(2.2rem, 5vw, 4.1rem); color: #fff7e6; }
.feedback-box,
.model-answer-box,
.answer-meta-card {
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.52);
  padding: 15px;
}
.feedback-box h3,
.model-answer-box h3 { margin: 0 0 8px; color: var(--gold-strong); font-size: .82rem; text-transform: uppercase; letter-spacing: .14em; }
.feedback-box p,
.model-answer-box p { margin: 0; color: var(--soft); line-height: 1.55; }
.answer-meta-card { display: grid; gap: 11px; }
.meta-row { display: grid; gap: 4px; padding-bottom: 11px; border-bottom: 1px solid rgba(148, 163, 184, 0.12); }
.meta-row:last-child { padding-bottom: 0; border-bottom: 0; }
.meta-row span { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .14em; font-weight: 900; }
.meta-row strong { color: #f8fbff; line-height: 1.4; }

.round-summary-card { display: grid; gap: 14px; align-content: start; }
.summary-stars { margin: 0; color: var(--gold); letter-spacing: .08em; font-size: 1.2rem; }
.summary-score {
  border-radius: 18px;
  padding: 14px;
  background: rgba(15, 23, 42, 0.58);
  color: #fff7e6;
  font-weight: 950;
  border: 1px solid rgba(245, 197, 111, 0.22);
}
.summary-list { display: grid; gap: 8px; }
.summary-row {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid rgba(148, 163, 184, 0.13);
}
.summary-row span { color: var(--muted); font-weight: 900; }
.summary-row strong { font-size: .88rem; }
.summary-row em { font-style: normal; color: var(--gold-strong); font-weight: 950; }

@keyframes wavePulse {
  0%, 100% { transform: scaleY(.68); opacity: .64; }
  50% { transform: scaleY(1); opacity: 1; }
}

@media (max-width: 1180px) {
  .three-panel-layout { grid-template-columns: 1fr; }
  .panel,
  .quiz-panel { min-height: auto; }
  .listening-console { min-height: 620px; }
  .answerCard-empty,
  .answer-reveal,
  .round-summary-card { min-height: auto; }
}

@media (max-width: 720px) {
  .app-shell { width: min(100% - 24px, 1560px); padding-top: 12px; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .topbar-actions { justify-content: flex-start; }
  .topbar-link { min-height: 38px; font-size: .78rem; }
  .setup-panel,
  .quiz-panel,
  .info-panel { padding: 16px; border-radius: 22px; }
  .listening-console { padding: 18px; border-radius: 22px; min-height: 560px; }
  .statsRow { grid-template-columns: 1fr; }
  .console-tt-combined-lockup { flex-direction: column; text-align: center; }
  .listening-visual span { width: 7px; }
  .console-heading h1 { font-size: 1.45rem; }
  .response-actions { display: grid; }
  .primary-button,
  .secondary-button,
  .play-button { width: 100%; }
}