.study-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.study-card .art-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.study-card .tool-badge{font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-text);background:var(--accent-soft);padding:3px 8px;border-radius:99px}
.study-card.is-soon{border-style:dashed;cursor:default;opacity:.85}.study-card.is-soon:hover{transform:none;box-shadow:none}
.study-page{max-width:880px}
.st-head{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;margin-bottom:14px}.st-head h1{flex-basis:100%;margin:0;font-family:var(--serif);font-weight:500;font-size:clamp(1.6rem,4vw,2.2rem);letter-spacing:-.02em}.st-head .eyebrow{margin:0}
.st-tabs{display:inline-flex;gap:4px;padding:4px;border:1px solid var(--border);border-radius:999px;background:var(--surface);margin-bottom:16px}
.st-tab{border:0;background:none;font:inherit;font-weight:600;font-size:.9rem;padding:7px 16px;border-radius:999px;color:var(--muted);cursor:pointer}
.st-tab[aria-selected="true"]{background:var(--brand);color:var(--bg)}
.fc-top{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.fc-bar,.fc-mastery{flex:1;height:8px;border-radius:99px;background:var(--bg-2);overflow:hidden}.fc-bar i,.fc-mastery i{display:block;height:100%;width:0;background:var(--accent);border-radius:99px;transition:width .3s var(--ease)}
.fc-mastery i{background:var(--violet)}
.fc-mastery-wrap{display:flex;align-items:center;gap:12px;margin-top:16px;font-size:.82rem}
.fc-card{position:relative;min-height:340px;perspective:1400px;cursor:pointer;outline-offset:4px;border-radius:var(--r-lg);transition:transform .18s var(--ease),opacity .18s}
.fc-card.out-r{transform:translateX(40px);opacity:0}.fc-card.out-l{transform:translateX(-40px);opacity:0}
.fc-face{position:absolute;inset:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:28px;backface-visibility:hidden;transition:transform .45s var(--ease);overflow:auto}
.fc-front{display:flex;flex-direction:column;justify-content:center}
.fc-back{transform:rotateY(180deg)}.fc-card.flipped .fc-front{transform:rotateY(-180deg)}.fc-card.flipped .fc-back{transform:rotateY(0)}
.fc-s{font-family:var(--serif);font-size:clamp(1.15rem,2.6vw,1.5rem);line-height:1.4;color:var(--brand);margin:6px 0 14px}
.fc-hint{font-size:.85rem;margin:0}
.fc-back dl{margin:0;display:grid;gap:10px}.fc-back dt{font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-text)}.fc-back dd{margin:2px 0 0;font-size:.94rem;line-height:1.5}
.fc-ref{font-size:.86rem!important;color:var(--muted)}.fc-miss{border-left:3px solid var(--intermediate);padding-left:10px}
.fc-actions{display:flex;gap:10px;margin-top:14px}.fc-actions .btn{flex:1;justify-content:center}
.fc-keys{font-size:.78rem;margin:10px 0 0}
.fc-done{padding:24px;text-align:center}
.st-guide{display:grid;grid-template-columns:1fr 1fr;gap:14px}.st-block{padding:20px}.st-block h2{margin:0 0 10px}.st-guide .st-block:first-child{grid-column:1/-1}
.st-dl{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:10px 20px}.st-dl dt{font-weight:650;color:var(--brand)}.st-dl dd{margin:2px 0 0;font-size:.9rem;color:var(--muted)}
.st-list{margin:0;padding-left:1.1em;list-style:"▪  "}.st-list li{margin:5px 0;font-size:.92rem}.st-list li::marker{color:var(--accent)}
.st-next{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
@media (max-width:640px){.fc-card{min-height:440px}.fc-face{padding:20px}.st-guide,.st-dl{grid-template-columns:1fr}.fc-keys{display:none}}