/* ===== Grammar for IELTS ===== */
:root { --nv: #14285a; --rd: #c8102e; }
.gr-hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px; align-items: center; background: linear-gradient(125deg, #14285a 0%, #23397a 55%, #6d1aa0 130%); color: #fff; border-radius: 22px; padding: 26px 28px; margin: 4px 0 18px; box-shadow: 0 14px 34px rgba(20,40,90,.16); }
.gr-hero h1 { color: #fff; margin: 10px 0 8px; font-size: 2rem; }
.gr-hero p { margin: 0 0 14px; line-height: 1.6; opacity: .93; max-width: 760px; }
.gr-hero .tag { display: inline-block; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.3); border-radius: 99px; padding: 4px 12px; font-size: .8rem; }
.gr-hero .lt-steps span { color: #fff; }
.gr-me { background: #fff; color: var(--nv); border-radius: 18px; padding: 16px 22px; text-align: center; min-width: 170px; display: grid; gap: 2px; }
.gr-me b { font: 800 2.2rem/1 Montserrat, sans-serif; color: var(--rd); }
.gr-me small { color: #5a6580; }
@media (max-width: 700px) { .gr-hero { grid-template-columns: minmax(0, 1fr); padding: 20px 18px; } .gr-hero h1 { font-size: 1.6rem; } }
.gr-topic { font-size: .85rem; text-transform: uppercase; letter-spacing: .06em; color: var(--rd); margin: 22px 0 10px; }
.gr-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.gr-card { display: flex; flex-direction: column; gap: 4px; background: #fff; border: 1.5px solid var(--line); border-radius: 16px; padding: 14px 16px; text-decoration: none; color: var(--ink); transition: transform .12s, border-color .12s, box-shadow .12s; }
.gr-card:hover { transform: translateY(-2px); border-color: var(--nv); box-shadow: 0 8px 20px rgba(20,40,90,.1); }
.gr-card.fin { border-color: #86efac; background: linear-gradient(180deg, #f0fdf4, #fff); }
.gr-card .no { font-size: .75rem; font-weight: 800; color: var(--rd); text-transform: uppercase; letter-spacing: .05em; }
.gr-card b { font-size: 1.02rem; color: var(--nv); line-height: 1.35; }
.gr-card i { font-style: normal; font-size: .82rem; color: #6b7280; }
.gr-card .meta { font-size: .8rem; color: #5a6580; margin-top: 4px; }
.gr-card .bar { height: 6px; background: #eef0f5; border-radius: 99px; overflow: hidden; margin-top: 4px; }
.gr-card .bar i { display: block; height: 100%; background: linear-gradient(90deg, #10b981, #22408a); }
.gr-crumb { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin: 4px 0 12px; font-size: .9rem; color: #5a6580; }
.gr-crumb a { font-weight: 700; color: var(--nv); }
.gr-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 18px; align-items: start; }
@media (max-width: 900px) { .gr-layout { grid-template-columns: minmax(0, 1fr); } .gr-toc { position: static !important; } }
.gr-toc { position: sticky; top: 76px; background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 14px; display: grid; gap: 2px; }
.gr-toc > b { color: var(--nv); margin-bottom: 4px; }
.gr-toc a { font-size: .86rem; color: #3c4763; text-decoration: none; padding: 5px 8px; border-radius: 8px; }
.gr-toc a:hover { background: #f4f6fb; color: var(--nv); }
.gr-score { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); display: grid; gap: 2px; text-align: center; }
.gr-score span { font-size: .8rem; color: #5a6580; }
.gr-score b { font: 800 1.8rem/1.1 Montserrat, sans-serif; color: var(--rd); }
.gr-score small { font-size: .78rem; line-height: 1.4; }
.gr-head { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; margin-bottom: 14px; }
.gr-head .no { font-size: .78rem; font-weight: 800; color: var(--rd); text-transform: uppercase; }
.gr-head h1 { margin: 4px 0 2px; color: var(--nv); font-size: 1.6rem; }
.gr-head .en { margin: 0 0 8px; color: #6b7280; font-style: italic; }
.gr-head p { margin: 0; line-height: 1.6; }
.gr-sec { margin-bottom: 18px; }
.gr-h { font-size: 1.2rem; color: var(--nv); margin: 6px 0 10px; }
.gr-th { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 14px 18px; margin-bottom: 10px; line-height: 1.65; scroll-margin-top: 80px; }
.gr-th h3 { margin: 0 0 8px; color: var(--nv); font-size: 1.05rem; }
.gr-th p { margin: 6px 0; }
.gr-th ul { margin: 6px 0; padding-left: 22px; }
.gr-th li { margin: 3px 0; }
.gr-th table { width: 100%; border-collapse: collapse; margin: 8px 0; font-size: .92rem; display: block; overflow-x: auto; }
.gr-th th, .gr-th td { border: 1px solid #e4e7f2; padding: 6px 10px; text-align: left; vertical-align: top; }
.gr-th th { background: #f2f5fc; color: var(--nv); }
.gr-th .note { background: #fff8e6; border: 1px solid #f3d38b; border-radius: 10px; padding: 8px 12px; color: #5b4300; }
.gr-mis { display: grid; gap: 8px; scroll-margin-top: 80px; }
.gr-mis > div { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 640px) { .gr-mis > div { grid-template-columns: 1fr; } }
.gr-mis span { border-radius: 12px; padding: 9px 12px; font-size: .93rem; }
.gr-mis .bad { background: #fff1f2; color: #991b1b; text-decoration: line-through; text-decoration-color: rgba(153,27,27,.35); }
.gr-mis .good { background: #ecfdf5; color: #065f46; font-weight: 600; }
.gr-ex { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 16px 18px; margin-bottom: 14px; scroll-margin-top: 80px; }
.gr-ex-h { display: grid; gap: 2px; margin-bottom: 8px; }
.gr-ex-h b { color: var(--nv); }
.gr-ex-h small { color: #6b7280; }
.gr-items { margin: 0; padding-left: 24px; display: grid; gap: 10px; }
.gr-item { padding: 8px 10px; border-radius: 12px; border: 1px solid transparent; }
.gr-item.right { background: #f0fdf4; border-color: #bbf7d0; }
.gr-item.wrong { background: #fff7f7; border-color: #fecaca; }
.gr-q { line-height: 1.55; margin-bottom: 6px; }
.gr-blank { color: var(--rd); font-weight: 700; letter-spacing: .05em; }
.gr-u { text-decoration: none; background: #fef3c7; border-bottom: 2px solid #f59e0b; padding: 0 3px; border-radius: 3px; }
.gr-opts { display: flex; gap: 8px; flex-wrap: wrap; }
.gr-opts.col { flex-direction: column; }
.gr-opt { display: flex; align-items: center; gap: 6px; border: 1.5px solid #d7dcec; border-radius: 10px; padding: 6px 12px; cursor: pointer; font-size: .95rem; background: #fff; }
.gr-opt.sel { border-color: var(--nv); background: #f2f5ff; }
.gr-opt.ans { border-color: #16a34a; background: #dcfce7; font-weight: 700; }
.gr-in { font: inherit; border: 1.5px solid #d7dcec; border-radius: 10px; padding: 7px 10px; width: min(320px, 100%); box-sizing: border-box; }
.gr-in.wide { width: 100%; }
.gr-in:focus { outline: 0; border-color: var(--nv); }
.gr-fb { margin-top: 6px; font-size: .9rem; line-height: 1.5; }
.gr-fb .ok { color: #16a34a; } .gr-fb .no { color: #dc2626; }
.gr-fb .why { color: #3c4763; margin-top: 2px; }
.gr-ex-f { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 12px; }
.gr-res { font-size: .95rem; color: var(--nv); }
.gr-nav { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin: 6px 0 18px; }
.gr-nav .btn { white-space: normal; max-width: 100%; text-align: center; }
@media (max-width: 900px) { .gr-toc a { display: none; } .gr-toc > b { display: none; } .gr-score { margin-top: 0; padding-top: 0; border-top: 0; } }