feat(lotto): DecisionCard 하위 컴포넌트(Pick/Tier/Toggle/Retro) + 스타일

src/pages/lotto/components/decision/PickCard.jsx

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+const ROLE_COLOR = { '안정': 'stable', '균형': 'balance', '공격': 'aggro' };
+
+export default function PickCard({ pick, index, total }) {
+    const role = pick.risk_tag;
+    return (
+        <div className="lc-set">
+            <div className="lc-set__head">
+                <span className={`lc-set__role lc-set__role--${ROLE_COLOR[role]}`}>● {role}</span>
+                <span className="lc-set__idx">Set {index + 1} / {total}</span>
+            </div>
+            <div className="lc-balls">
+                {pick.numbers.map(n => (
+                    <span key={n} className={`ball ball--${Math.ceil(n / 10)}`}>{n}</span>
+                ))}
+            </div>
+            <p className="lc-set__reason">{pick.reason}</p>
+        </div>
+    );
+}

src/pages/lotto/components/decision/RetrospectiveBox.jsx

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+export default function RetrospectiveBox({ briefing, review }) {
+    const retro = briefing?.narrative?.retrospective;
+    if (!retro) return null;
+    const drawNo = review?.draw_no ?? (briefing?.draw_no ? briefing.draw_no - 1 : null);
+    return (
+        <aside className="lc-retro">
+            <p className="lc-retro__time">▸ 지난 주 {drawNo ? `${drawNo}회` : ''} 회고</p>
+            <p className="lc-retro__body">{retro}</p>
+        </aside>
+    );
+}

src/pages/lotto/components/decision/TierModeToggle.jsx

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+const MODES = [
+    { key: 'core',                label: '코어',     sets: 5,  amount: 5000 },
+    { key: 'core_bonus',          label: '+ 보너스', sets: 10, amount: 10000 },
+    { key: 'core_bonus_extended', label: '+ 확장',   sets: 15, amount: 15000 },
+    { key: 'full',                label: '+ 풀',     sets: 20, amount: 20000 },
+];
+
+export default function TierModeToggle({ value, onChange }) {
+    return (
+        <div className="lc-toggle" role="tablist">
+            {MODES.map((m, i) => (
+                <button
+                    key={m.key}
+                    role="tab"
+                    aria-selected={value === m.key}
+                    className={`lc-toggle__chip ${value === m.key ? 'is-active' : ''}`}
+                    onClick={() => onChange(m.key)}
+                >
+                    <span className="lc-toggle__dots">{'●'.repeat(i + 1) + '○'.repeat(3 - i)}</span>
+                    <span className="lc-toggle__lbl">{m.label}</span>
+                    <span className="lc-toggle__sub">{m.sets}세트 · {m.amount.toLocaleString()}원</span>
+                </button>
+            ))}
+        </div>
+    );
+}
+
+export { MODES };

src/pages/lotto/components/decision/TierSection.jsx

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+import PickCard from './PickCard';
+
+const TIER_TITLE = {
+    core: '코어 (필수, 5세트)',
+    bonus: '보너스 (+5)',
+    extended: '확장 (+5)',
+    pool: '풀 (+5)',
+};
+
+export default function TierSection({ tier, picks, rationale, indexBase = 0, totalSets }) {
+    if (!picks?.length) return null;
+    return (
+        <section className={`lc-tier lc-tier--${tier}`}>
+            <header className="lc-tier__head">
+                <h4>{TIER_TITLE[tier]}</h4>
+                {rationale && tier !== 'core' && (
+                    <p className="lc-tier__rationale">{rationale}</p>
+                )}
+            </header>
+            {picks.map((p, i) => (
+                <PickCard key={i} pick={p} index={indexBase + i} total={totalSets} />
+            ))}
+        </section>
+    );
+}

src/pages/lotto/components/decision/decision.css

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+.lc-card { max-width: 720px; margin: 0 auto; background: linear-gradient(180deg, #161220 0%, #1a1426 100%);
+  border: 1px solid rgba(255,255,255,0.08); border-radius: 16px; padding: 24px; color: #ece6f7; }
+.lc-head { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 14px; }
+.lc-eyebrow { font-size: 10px; letter-spacing: 2px; opacity: 0.5; text-transform: uppercase; margin: 0 0 4px; }
+.lc-title { font-size: 22px; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
+.lc-conf { display: flex; flex-direction: column; align-items: flex-end; }
+.lc-conf__num { font-family: 'Courier New', monospace; font-size: 28px; font-weight: 700; color: #b8a8ff; letter-spacing: -0.04em; }
+.lc-conf__lbl { font-size: 9px; letter-spacing: 1.5px; opacity: 0.55; }
+.lc-retro { background: rgba(184, 168, 255, 0.06); border-left: 2px solid rgba(184, 168, 255, 0.4);
+  padding: 10px 14px; margin: 14px 0; border-radius: 4px; }
+.lc-retro__time { font-size: 9px; letter-spacing: 1.5px; color: #b8a8ff; opacity: 0.7; margin: 0 0 4px; }
+.lc-retro__body { font-size: 13px; line-height: 1.55; opacity: 0.85; margin: 0; }
+.lc-headline { font-size: 16px; font-weight: 600; line-height: 1.5; margin: 18px 0 4px; }
+.lc-headline-3 { font-size: 12px; opacity: 0.65; line-height: 1.55; margin: 0 0 18px; }
+.lc-balance { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px;
+  background: rgba(255,255,255,0.03); border-radius: 8px; margin-bottom: 16px; font-size: 11px; }
+.lc-balance__chips { display: flex; gap: 8px; }
+.lc-chip { padding: 3px 8px; border-radius: 100px; font-weight: 600; font-size: 11px; }
+.lc-chip--stable { background: rgba(80, 200, 120, 0.15); color: #76e09a; }
+.lc-chip--balance { background: rgba(255, 200, 80, 0.15); color: #ffce6e; }
+.lc-chip--aggro { background: rgba(255, 100, 130, 0.15); color: #ff8aa0; }
+.lc-toggle { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 16px 0; }
+.lc-toggle__chip { padding: 10px 8px; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08);
+  border-radius: 10px; color: #ece6f7; cursor: pointer; display: flex; flex-direction: column; gap: 4px; align-items: center; }
+.lc-toggle__chip.is-active { background: rgba(184, 168, 255, 0.15); border-color: rgba(184, 168, 255, 0.5); }
+.lc-toggle__dots { letter-spacing: 2px; font-size: 10px; opacity: 0.7; }
+.lc-toggle__lbl { font-size: 12px; font-weight: 600; }
+.lc-toggle__sub { font-size: 10px; opacity: 0.55; }
+.lc-tier { margin-bottom: 14px; }
+.lc-tier__head { padding: 8px 0; border-top: 1px dashed rgba(255,255,255,0.1); margin-bottom: 8px; }
+.lc-tier:first-of-type .lc-tier__head { border-top: none; }
+.lc-tier__head h4 { font-size: 12px; font-weight: 600; margin: 0 0 4px; opacity: 0.75; letter-spacing: 0.5px; }
+.lc-tier__rationale { font-size: 11px; opacity: 0.55; margin: 0; }
+.lc-set { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); border-radius: 12px;
+  padding: 14px; margin-bottom: 10px; }
+.lc-set__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
+.lc-set__role { font-size: 11px; font-weight: 600; letter-spacing: 0.5px; }
+.lc-set__role--stable { color: #76e09a; }
+.lc-set__role--balance { color: #ffce6e; }
+.lc-set__role--aggro { color: #ff8aa0; }
+.lc-set__idx { font-size: 10px; opacity: 0.4; }
+.lc-balls { display: flex; gap: 6px; margin-bottom: 8px; flex-wrap: wrap; }
+.lc-set__reason { font-size: 12px; opacity: 0.7; line-height: 1.45; margin: 0; }
+.lc-actions { display: flex; gap: 10px; margin-top: 18px; }
+@media (max-width: 480px) {
+  .lc-toggle { grid-template-columns: repeat(2, 1fr); }
+}