:root{color:var(--ink);background:var(--app-bg);font-family:var(--font-ui);font-synthesis:none;text-rendering:optimizeLegibility;--font-ui: "PingFang TC", "Noto Sans TC", "Noto Sans CJK TC", "Microsoft JhengHei", "Hiragino Sans", sans-serif;--font-title: "PingFang TC", "Noto Sans TC", "Noto Sans CJK TC", "Microsoft JhengHei", sans-serif;--font-japanese-ui: "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", "Noto Sans CJK JP", var(--font-ui);--font-japanese-display: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", "Noto Serif CJK JP", "Songti TC", serif;--app-bg: #f1ede3;--paper: #fffaf0;--paper-deep: #e7eee7;--ink: #172126;--muted: #56676a;--rule: #c5d4d2;--teal: #0f766e;--teal-dark: #115e59;--vermilion: #e85d2a;--indigo: #0f7ea8;--gold: #b7791f;--green: #257a4b;--shadow: 0 20px 54px rgba(15, 47, 53, .16);--body-grid-row: rgba(15, 118, 110, .12);--body-grid-column: rgba(15, 126, 168, .1);--bg-glow-primary: rgba(20, 184, 166, .16);--bg-glow-secondary: rgba(232, 93, 42, .12);--panel-glow: rgba(15, 126, 168, .12);--panel-bg: linear-gradient(180deg, rgba(255, 250, 240, .92), rgba(248, 243, 231, .98));--panel-border: #b6c8c5;--button-border: #456065;--button-text: #172126;--button-hover-shadow: 0 10px 22px rgba(15, 47, 53, .14);--selected-text: #fffaf0;--label-text: #42565a;--field-bg: #fffaf0;--field-border: #94aaa8;--field-disabled-bg: #e7e1d4;--field-disabled-text: #71807f;--focus-fill: rgba(255, 250, 240, .9);--focus-outline: rgba(20, 184, 166, .36);--prompt-chip-border: #9ab2b0;--prompt-chip-text: #42565a;--target-chip-bg: #ffe3d2;--target-chip-border: #f0a070;--target-chip-text: #8d3415;--word-kind-bg: rgba(15, 126, 168, .1);--word-kind-border: rgba(15, 126, 168, .24);--surface-ink: #10161a;--surface-shadow: 0 1px 0 rgba(255, 250, 240, .9);--summary-bg: rgba(15, 118, 110, .12);--summary-border: rgba(15, 118, 110, .28);--summary-text: #0d5d58;--feedback-correct-bg: #e6f7ec;--feedback-correct-border: #95d8ad;--feedback-incorrect-bg: #fff0e7;--feedback-incorrect-border: #f0a385;--feedback-revealed-bg: #fff6dc;--feedback-revealed-border: #dfbc63;--feedback-revealed-title: #8a5d08;--example-rule: rgba(23, 33, 38, .16);--review-row-text: #394b4e;--review-pill-bg: rgba(15, 126, 168, .1);--review-pill-border: rgba(15, 126, 168, .24);color-scheme:light}:root[data-theme=dark]{--app-bg: #0b1518;--paper: #111d22;--paper-deep: #16272d;--ink: #f6fbf6;--muted: #a9bdbc;--rule: #263c43;--teal: #14b8a6;--teal-dark: #0f766e;--vermilion: #f97316;--indigo: #38bdf8;--gold: #fbbf24;--green: #86efac;--shadow: 0 26px 72px rgba(0, 0, 0, .48);--body-grid-row: rgba(20, 184, 166, .08);--body-grid-column: rgba(56, 189, 248, .07);--bg-glow-primary: rgba(20, 184, 166, .16);--bg-glow-secondary: rgba(249, 115, 22, .15);--panel-glow: rgba(56, 189, 248, .11);--panel-bg: linear-gradient(180deg, rgba(20, 34, 39, .96), rgba(10, 20, 24, .98));--panel-border: #244149;--button-border: #34535c;--button-text: #effaf7;--button-hover-shadow: 0 12px 26px rgba(0, 0, 0, .4);--selected-text: #101216;--label-text: #d8e6e2;--field-bg: #0d171b;--field-border: #2f535c;--field-disabled-bg: #17262b;--field-disabled-text: #7f9697;--focus-fill: rgba(13, 23, 27, .92);--focus-outline: rgba(56, 189, 248, .48);--prompt-chip-border: #395a62;--prompt-chip-text: #c8d6d4;--target-chip-bg: rgba(249, 115, 22, .17);--target-chip-border: rgba(249, 115, 22, .58);--target-chip-text: #ffbe8a;--word-kind-bg: rgba(56, 189, 248, .13);--word-kind-border: rgba(56, 189, 248, .34);--surface-ink: #fbfff8;--surface-shadow: 0 0 28px rgba(20, 184, 166, .18), 0 2px 0 rgba(0, 0, 0, .8);--summary-bg: rgba(20, 184, 166, .13);--summary-border: rgba(45, 212, 191, .34);--summary-text: #99f6e4;--feedback-correct-bg: rgba(34, 197, 94, .14);--feedback-correct-border: rgba(134, 239, 172, .52);--feedback-incorrect-bg: rgba(249, 115, 22, .15);--feedback-incorrect-border: rgba(251, 146, 60, .58);--feedback-revealed-bg: rgba(251, 191, 36, .13);--feedback-revealed-border: rgba(251, 191, 36, .56);--feedback-revealed-title: #fde68a;--example-rule: rgba(246, 251, 246, .16);--review-row-text: #d8e7e3;--review-pill-bg: rgba(56, 189, 248, .14);--review-pill-border: rgba(56, 189, 248, .34);color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 18% 0%,var(--bg-glow-primary),transparent 32rem),radial-gradient(circle at 100% 8%,var(--bg-glow-secondary),transparent 28rem),linear-gradient(var(--body-grid-row) 1px,transparent 1px) 0 0 / 100% 32px,linear-gradient(90deg,var(--body-grid-column) 1px,transparent 1px) 3rem 0 / 100% 100%,var(--app-bg)}body,button,input,select{font:inherit;letter-spacing:0}button{align-items:center;border:1px solid var(--button-border);border-radius:8px;color:var(--button-text);cursor:pointer;display:inline-flex;gap:.45rem;justify-content:center;min-height:2.75rem;padding:.58rem .85rem;transition:background .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease}button:hover:not(:disabled){border-color:color-mix(in srgb,var(--teal) 58%,var(--button-border));box-shadow:var(--button-hover-shadow);transform:translateY(-1px)}button:disabled{cursor:not-allowed;opacity:.48}button svg{flex:0 0 auto;height:1rem;width:1rem}.app-shell{min-height:100vh;padding:1.25rem}.app-heading{align-items:end;display:flex;gap:1rem;justify-content:space-between;margin:0 auto 1rem;max-width:1220px}.app-heading h1,.app-heading p,.brand-lockup p,.brand-lockup h2,.review-heading h2,.feedback h2,.word-block p{margin:0}.app-heading h1{color:var(--ink);font-family:var(--font-title);font-size:2rem;font-weight:700;line-height:1.15}.app-heading>p{color:var(--muted);max-width:30rem;text-align:right}.heading-actions{align-items:end;display:flex;gap:.75rem;flex-wrap:wrap;justify-content:flex-end}.heading-actions p{color:var(--muted);max-width:30rem;text-align:right}.theme-toggle{background:color-mix(in srgb,var(--paper) 86%,transparent);color:var(--button-text);flex:0 0 auto;font-weight:800}.language-switch{align-items:center;background:color-mix(in srgb,var(--paper) 72%,transparent);border:1px solid var(--panel-border);border-radius:999px;display:inline-flex;flex:0 0 auto;gap:.25rem;padding:.22rem}.language-switch svg{color:var(--muted);height:1rem;margin-left:.45rem;width:1rem}.language-switch button{background:transparent;border:0;border-radius:999px;color:var(--muted);font-size:.78rem;font-weight:800;min-height:2.1rem;padding:.35rem .62rem}.language-switch button.selected{background:linear-gradient(135deg,var(--teal),var(--indigo));color:var(--selected-text)}.view-switch{margin:0 auto 1rem;max-width:360px}.view-switch button{font-weight:800}.eyebrow{color:var(--teal);font-size:.76rem;font-weight:800;text-transform:uppercase}.learning-panel{animation:panel-rise .24s ease both;background:radial-gradient(circle at 80% 0%,var(--panel-glow),transparent 24rem),var(--panel-bg),var(--paper);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid var(--panel-border);border-top:4px solid var(--teal);border-radius:8px;box-shadow:var(--shadow);margin:0 auto;max-width:1220px;padding:1.25rem}.learning-hero{align-items:start;border-bottom:1px solid var(--rule);display:grid;gap:1rem;grid-template-columns:minmax(0,1.1fr) minmax(300px,.82fr);padding-bottom:1.05rem}.learning-copy{align-content:start;display:grid;gap:1rem}.learning-copy h2,.learning-copy p,.quick-start-heading h3,.quick-start-heading p,.quick-start-card h4,.quick-start-card p,.detail-divider h3,.detail-divider p,.learning-section-copy h3,.learning-section-copy p,.learning-roadmap p,.rule-card h4,.rule-card p,.pipeline-card p,.lesson-card h3,.lesson-card p{margin:0}.learning-copy h2{color:var(--ink);font-family:var(--font-title);font-size:2rem;font-weight:700;line-height:1.15}.learning-copy>p:last-child{color:var(--muted);font-size:1.02rem;line-height:1.65;max-width:44rem}.learning-hero-actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:.15rem}.priority-drill-button{background:#fbbf2429;border-color:color-mix(in srgb,var(--gold) 58%,var(--summary-border));color:var(--gold);font-weight:800}.learning-path-card{background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 92%,transparent),color-mix(in srgb,var(--paper-deep) 74%,transparent));border:1px solid var(--panel-border);border-radius:8px;min-width:0;padding:.95rem}.learning-roadmap{counter-reset:learning;display:grid;gap:.55rem;grid-template-columns:1fr;list-style:none;margin:.7rem 0 0;padding:0}.learning-roadmap li{background:color-mix(in srgb,var(--paper-deep) 68%,transparent);border-left:3px solid var(--teal);display:grid;gap:.2rem;min-width:0;padding:.58rem 0 .58rem .72rem}.learning-roadmap span,.pipeline-card span{color:var(--teal);font-size:.78rem;font-weight:800}.learning-roadmap strong{color:var(--ink);font-size:.96rem}.learning-roadmap p{color:var(--muted);display:-webkit-box;font-size:.88rem;line-height:1.45;overflow:hidden;-webkit-box-orient:vertical;-webkit-line-clamp:2}.quick-start{display:grid;gap:.8rem;margin-top:1.05rem}.quick-start-heading{align-items:end;display:flex;gap:1rem;justify-content:space-between}.quick-start-heading h3,.detail-divider h3{color:var(--ink);font-size:1.28rem;line-height:1.25}.quick-start-heading>p,.detail-divider>p{color:var(--muted);line-height:1.55;max-width:32rem;text-align:right}.quick-start-grid{display:grid;gap:.75rem;grid-template-columns:repeat(4,minmax(0,1fr))}.quick-start-card{background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 96%,var(--indigo) 4%),var(--field-bg));border:1px solid var(--panel-border);border-radius:8px;display:grid;gap:.62rem;min-width:0;padding:.95rem}.quick-start-card.featured{background:linear-gradient(135deg,rgba(249,115,22,.18),transparent 78%),var(--field-bg);border-color:var(--vermilion)}.quick-start-card span{color:var(--teal);font-size:.78rem;font-weight:800}.quick-start-card h4{color:var(--ink);font-size:1.08rem;line-height:1.25}.quick-start-card p{color:var(--muted);line-height:1.55}.quick-start-card code{background:var(--summary-bg);border:1px solid var(--summary-border);border-radius:6px;color:var(--summary-text);font-family:var(--font-japanese-ui);font-weight:700;overflow-wrap:anywhere;padding:.55rem .62rem}.quick-start-button{background:color-mix(in srgb,var(--paper) 86%,var(--field-bg));color:var(--button-text);font-weight:800;justify-self:start;margin-top:.1rem}.quick-start-card.featured .quick-start-button{background:linear-gradient(135deg,var(--vermilion),var(--gold));border-color:var(--vermilion);color:var(--selected-text)}.detail-divider{align-items:end;border-top:1px solid var(--rule);display:flex;gap:1rem;justify-content:space-between;margin-top:1.15rem;padding-top:1.05rem}.learning-section{border-top:1px solid var(--rule);display:grid;gap:.95rem;margin-top:1.15rem;padding-top:1.15rem}.learning-section-copy{display:grid;gap:.35rem;max-width:52rem}.learning-section-copy h3{color:var(--ink);font-size:1.35rem;line-height:1.25}.learning-section-copy p:last-child{color:var(--muted);line-height:1.65}.rule-matrix{display:grid;gap:.75rem}.rule-matrix.three-column{grid-template-columns:repeat(3,minmax(0,1fr))}.rule-card,.pipeline-card{background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 96%,var(--teal) 4%),var(--field-bg));border:1px solid var(--panel-border);border-radius:8px;display:grid;gap:.65rem;min-width:0;padding:.95rem}.rule-card h4{color:var(--ink);font-size:1.02rem}.rule-card p{color:var(--muted);line-height:1.55}.rule-card small{border-top:1px solid var(--rule);color:var(--label-text);line-height:1.5;padding-top:.65rem}.sound-table{background:var(--field-bg);border:1px solid var(--panel-border);border-radius:8px;overflow:hidden}.sound-row{align-items:stretch;border-bottom:1px solid var(--rule);display:grid;gap:0;grid-template-columns:minmax(4.7rem,.7fr) minmax(3.7rem,.55fr) minmax(3.7rem,.55fr) minmax(0,2fr)}.sound-row:last-child{border-bottom:0}.sound-row>span,.sound-row>code{align-items:center;border-right:1px solid var(--rule);color:var(--ink);display:flex;min-width:0;overflow-wrap:anywhere;padding:.68rem .75rem}.sound-row>:last-child{border-right:0}.sound-row code,.pipeline-card code{color:var(--summary-text);font-family:var(--font-japanese-ui);font-weight:700}.sound-head{background:linear-gradient(90deg,var(--summary-bg),color-mix(in srgb,var(--summary-bg) 58%,transparent))}.sound-head span{color:var(--summary-text);font-size:.82rem;font-weight:800}.pipeline-grid{display:grid;gap:.75rem;grid-template-columns:repeat(4,minmax(0,1fr))}.pipeline-card code{background:var(--summary-bg);border:1px solid var(--summary-border);border-radius:6px;overflow-wrap:anywhere;padding:.55rem .62rem}.pipeline-card p{color:var(--muted);line-height:1.55}.inline-action-row{display:flex;flex-wrap:wrap;gap:.65rem}.inline-drill-button{background:linear-gradient(135deg,var(--teal),var(--indigo));border-color:var(--teal);color:var(--selected-text);font-weight:800;justify-self:start;min-width:9rem}.lesson-grid{display:grid;gap:.8rem;grid-template-columns:repeat(3,minmax(0,1fr));margin-top:1.15rem}.lesson-card{background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 96%,var(--indigo) 4%),var(--field-bg));border:1px solid var(--panel-border);border-radius:8px;display:grid;gap:.7rem;min-height:17rem;padding:1rem}.lesson-card span{color:var(--teal);font-size:.82rem;font-weight:800}.lesson-card h3{color:var(--ink);font-size:1.1rem;line-height:1.35}.lesson-card p{color:var(--muted);line-height:1.65}.formula-row{align-self:end;display:grid;gap:.45rem}.formula-row code{background:var(--summary-bg);border:1px solid var(--summary-border);border-radius:6px;color:var(--summary-text);font-family:var(--font-japanese-ui);font-weight:700;padding:.5rem .6rem}.start-challenge{background:linear-gradient(135deg,var(--vermilion),var(--gold));border-color:var(--vermilion);color:var(--selected-text);font-weight:800;min-width:11rem}.practice-layout{display:grid;gap:1rem;grid-template-columns:minmax(236px,.82fr) minmax(340px,1.65fr) minmax(230px,.76fr);margin:0 auto;max-width:1220px}.controls-panel,.drill-panel,.review-panel{animation:panel-rise .24s ease both;background:radial-gradient(circle at 50% 0%,var(--panel-glow),transparent 22rem),var(--panel-bg),var(--paper);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid var(--panel-border);border-radius:8px;box-shadow:var(--shadow);padding:1.15rem}.controls-panel{border-top:4px solid var(--teal)}.drill-panel{animation-delay:60ms;border-top:4px solid var(--vermilion);min-height:640px}.review-panel{animation-delay:.12s;border-top:4px solid var(--indigo)}.brand-lockup{align-items:center;border-bottom:1px solid var(--rule);display:flex;gap:.8rem;margin-bottom:1.1rem;padding-bottom:1rem}.brand-lockup svg{color:var(--teal);height:2rem;width:2rem}.brand-lockup p{color:var(--muted);font-family:var(--font-title);font-size:.82rem}.brand-lockup h2{color:var(--ink);font-family:var(--font-title);font-size:1.55rem;font-weight:700;line-height:1.2}fieldset{border:0;margin:0 0 1rem;padding:0}legend,.select-label{color:var(--label-text);display:block;font-size:.86rem;font-weight:800;margin-bottom:.45rem}.segmented{display:grid;gap:.42rem;grid-template-columns:repeat(2,minmax(0,1fr))}.segmented button,.ghost-button{background:color-mix(in srgb,var(--paper) 88%,var(--field-bg));color:var(--button-text)}.segmented button{min-width:0;white-space:nowrap}.segmented button.selected{background:linear-gradient(135deg,var(--teal),var(--indigo));border-color:var(--teal);color:var(--selected-text)}.focus-segmented{grid-template-columns:1fr}select{background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 95%,var(--indigo) 5%),var(--field-bg));border:1px solid var(--field-border);border-radius:6px;color:var(--ink);min-height:2.9rem;padding:.64rem .75rem;width:100%}select:focus,button:focus-visible{box-shadow:0 0 0 4px var(--focus-fill);outline:3px solid var(--focus-outline);outline-offset:2px}select:disabled{background:var(--field-disabled-bg);color:var(--field-disabled-text)}.focus-summary{background:var(--summary-bg);border:1px solid var(--summary-border);border-radius:6px;color:var(--summary-text);font-size:.84rem;font-weight:800;line-height:1.45;margin:.6rem 0 1rem;overflow-wrap:anywhere;padding:.64rem .72rem}.score-strip{border-bottom:1px solid var(--rule);border-top:1px solid var(--rule);display:grid;gap:.4rem;grid-template-columns:repeat(3,minmax(0,1fr));margin:1rem 0;padding:.8rem 0}.score-strip span{color:var(--muted);display:grid;font-size:.78rem;gap:.18rem;justify-items:center;text-align:center}.score-strip strong{color:var(--ink);font-size:1.25rem;line-height:1}.prompt-header{align-items:center;display:flex;justify-content:space-between}.prompt-header span,.prompt-header strong{border:1px solid var(--prompt-chip-border);border-radius:999px;color:var(--prompt-chip-text);font-size:.88rem;line-height:1;padding:.42rem .72rem}.prompt-header strong{background:linear-gradient(135deg,var(--target-chip-bg),color-mix(in srgb,var(--target-chip-bg) 62%,transparent));border-color:var(--target-chip-border);color:var(--target-chip-text)}.word-block{align-items:center;display:grid;isolation:isolate;justify-items:center;min-height:268px;padding:2rem 0 1.1rem;position:relative}.word-block:before{background:radial-gradient(circle,color-mix(in srgb,var(--teal) 14%,transparent),transparent 66%);content:"";height:14rem;left:50%;pointer-events:none;position:absolute;top:46%;transform:translate(-50%,-50%);width:min(26rem,100%);z-index:-1}.word-block>*{position:relative;z-index:1}.word-kind{align-items:center;background:var(--word-kind-bg);border:1px solid var(--word-kind-border);border-radius:999px;color:var(--indigo);display:inline-flex;font-size:.82rem;font-weight:800;gap:.35rem;margin-bottom:.8rem;padding:.35rem .68rem}.word-kind svg{height:.95rem;width:.95rem}.reading,.meaning{color:var(--muted)}.surface{color:var(--surface-ink);font-family:var(--font-japanese-display);font-size:6rem;line-height:1.05;margin:.35rem 0;overflow-wrap:anywhere;text-align:center;text-shadow:var(--surface-shadow)}.choice-grid{display:grid;gap:.6rem;grid-template-columns:repeat(2,minmax(0,1fr))}.choice-option{background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 88%,var(--indigo) 12%),var(--field-bg));border-color:color-mix(in srgb,var(--field-border) 80%,var(--indigo));color:var(--ink);font-family:var(--font-japanese-ui);font-size:1.18rem;font-weight:700;box-shadow:inset 0 1px color-mix(in srgb,var(--ink) 8%,transparent);min-height:3.6rem;overflow-wrap:anywhere;padding:.7rem}.choice-option:hover:not(:disabled){background:linear-gradient(180deg,color-mix(in srgb,var(--field-bg) 78%,var(--teal) 22%),var(--field-bg))}.choice-option:disabled{opacity:1}.choice-option.correct{background:var(--feedback-correct-bg);border-color:var(--green);color:var(--ink)}.choice-option.incorrect{background:var(--feedback-incorrect-bg);border-color:var(--vermilion);color:var(--ink)}.next-button{background:linear-gradient(135deg,var(--vermilion),var(--gold));border-color:var(--vermilion);color:var(--selected-text);font-weight:800;min-width:5.7rem}.action-row{display:flex;gap:.6rem;justify-content:flex-end;margin-top:.85rem}.feedback{background:var(--field-bg);border:1px solid;border-left-width:5px;border-radius:8px;margin-top:1rem;padding:1rem}.feedback.correct{background:var(--feedback-correct-bg);border-color:var(--feedback-correct-border);border-left-color:var(--green)}.feedback.incorrect{background:var(--feedback-incorrect-bg);border-color:var(--feedback-incorrect-border);border-left-color:var(--vermilion)}.feedback.revealed{background:var(--feedback-revealed-bg);border-color:var(--feedback-revealed-border);border-left-color:var(--gold)}.feedback-title{align-items:center;display:flex;gap:.5rem}.feedback-title svg{height:1.2rem;width:1.2rem}.feedback.correct .feedback-title{color:var(--green)}.feedback.incorrect .feedback-title{color:var(--vermilion)}.feedback.revealed .feedback-title{color:var(--feedback-revealed-title)}.answer-key{color:var(--ink);font-weight:800}.example{border-top:1px solid var(--example-rule);margin-bottom:0;padding-top:.75rem}.example span{color:var(--muted);display:block;margin-top:.25rem}.review-heading{align-items:center;display:flex;justify-content:space-between}.review-heading h2{color:var(--ink);font-size:1rem}.review-heading span{background:var(--review-pill-bg);border:1px solid var(--review-pill-border);border-radius:999px;color:var(--indigo);font-size:.82rem;font-weight:800;padding:.28rem .58rem}.review-panel ul{list-style:none;margin:1rem 0 0;padding:0}.review-panel li{border-bottom:1px solid var(--rule);color:var(--review-row-text);padding:.75rem 0}.review-panel p,.empty-state{color:var(--muted)}@media(max-width:980px){.app-heading{align-items:start;display:grid}.app-heading>p{text-align:left}.practice-layout,.learning-hero{grid-template-columns:1fr}.quick-start-heading,.detail-divider{align-items:start;display:grid}.quick-start-heading>p,.detail-divider>p{text-align:left}.rule-matrix.three-column{grid-template-columns:1fr}.quick-start-grid,.pipeline-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-grid{grid-template-columns:1fr}.drill-panel{min-height:auto;order:1}.controls-panel{order:2}.review-panel{order:3}.surface{font-size:5rem}}@media(max-width:560px){body{background:radial-gradient(circle at 16% 0%,var(--bg-glow-primary),transparent 24rem),radial-gradient(circle at 100% 4%,var(--bg-glow-secondary),transparent 22rem),linear-gradient(var(--body-grid-row) 1px,transparent 1px) 0 0 / 100% 30px,var(--app-bg)}.app-shell{padding:.75rem}.app-heading h1{font-size:1.65rem}.heading-actions{align-items:stretch;display:grid;grid-template-columns:1fr}.heading-actions p{grid-column:1 / -1;text-align:left}.language-switch{border-radius:8px;justify-content:center}.theme-toggle{justify-self:stretch;padding-inline:.72rem}.controls-panel,.drill-panel,.learning-panel,.review-panel{padding:1rem}.learning-copy{gap:.75rem}.learning-copy h2{font-size:1.55rem}.learning-copy>p:last-child{font-size:.95rem;line-height:1.5}.learning-path-card{padding:.75rem}.learning-roadmap{gap:.42rem}.learning-roadmap li{align-items:center;display:flex;gap:.5rem;padding:.5rem 0 .5rem .65rem}.learning-roadmap span{flex:0 0 auto;font-size:.72rem}.learning-roadmap strong{font-size:.9rem;line-height:1.25}.learning-roadmap p{display:none}.surface{font-size:4.25rem}.answer-row,.learning-hero-actions,.quick-start-grid{grid-template-columns:1fr}.learning-hero-actions{display:grid}.learning-hero-actions button,.quick-start-button{justify-self:stretch}.choice-grid,.pipeline-grid{grid-template-columns:1fr}.sound-row{grid-template-columns:minmax(3.4rem,.7fr) minmax(2.9rem,.52fr) minmax(2.9rem,.52fr) minmax(0,1.8fr)}.sound-row>span,.sound-row>code{padding:.58rem .5rem}.inline-action-row,.action-row{display:grid}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:1ms!important;scroll-behavior:auto!important;transition-duration:1ms!important}}@keyframes panel-rise{0%{transform:translateY(8px)}to{transform:translateY(0)}}