.uc-hero { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); color: #fff; padding: 2.75rem 0 2.25rem; text-align: center; border-bottom: 1px solid #334155; }
.uc-hero h1 { font-size: 2.1rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 0.6rem; color: #ffffff; }
.uc-hero p { font-size: 1.05rem; color: #94a3b8; max-width: 680px; margin: 0 auto 1.5rem; line-height: 1.5; }

.uc-search-wrap { max-width: 540px; margin: 0 auto; position: relative; }
.uc-search-input { width: 100%; padding: 0.85rem 1.25rem 0.85rem 2.85rem; font-size: 1rem; border-radius: 99px; border: 2px solid #334155; background: rgba(255, 255, 255, 0.08); color: #fff; outline: none; transition: border-color 0.2s, background 0.2s; }
.uc-search-input:focus { border-color: #38bdf8; background: rgba(255, 255, 255, 0.14); }
.uc-search-icon { position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); color: #94a3b8; font-size: 1.1rem; pointer-events: none; }

.uc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; margin: 2rem 0 3rem; }
.uc-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem; text-decoration: none; color: var(--text); transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s; display: flex; flex-direction: column; gap: 0.5rem; }
.uc-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); border-color: var(--primary); }
.uc-card-head { display: flex; align-items: center; gap: 0.75rem; }
.uc-card-ico { width: 44px; height: 44px; border-radius: 12px; background: #eff6ff; display: flex; align-items: center; justify-content: center; font-size: 1.4rem; flex-shrink: 0; }
.uc-card-title { font-size: 1.15rem; font-weight: 700; color: var(--text); }
.uc-card-desc { font-size: 0.88rem; color: var(--muted); line-height: 1.45; }
.uc-card-chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.5rem; }
.uc-chip { font-size: 0.72rem; font-weight: 600; padding: 0.15rem 0.5rem; border-radius: 4px; background: #f1f5f9; color: #475569; }

/* Interactive Converter Box */
.uc-converter-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 2rem; box-shadow: var(--shadow-card); margin: 1.5rem auto 2.5rem; max-width: 1120px; position: relative; z-index: 10; }
.uc-row { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1.25rem; align-items: center; }
@media (max-width: 640px) { .uc-row { grid-template-columns: 1fr; gap: 0.75rem; } .uc-swap-btn { transform: rotate(90deg); margin: 0 auto; } }

.uc-field-group { display: flex; flex-direction: column; gap: 0.4rem; min-width: 0; }
.uc-field-group label { font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.uc-input, .uc-select { width: 100%; padding: 0.8rem 1rem; font-size: 1.1rem; border-radius: var(--radius-md); border: 1px solid var(--input-border); background: var(--bg); color: var(--text); outline: none; font-weight: 600; transition: border-color 0.2s, box-shadow 0.2s; min-width: 0; box-sizing: border-box; }
.uc-input:focus, .uc-select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15); }

.uc-swap-btn { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border); background: #f8fafc; color: var(--text); font-size: 1.25rem; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background 0.2s, transform 0.2s; margin-top: 1.4rem; flex-shrink: 0; }
.uc-swap-btn:hover { background: #eff6ff; color: var(--primary); transform: scale(1.08); }

.uc-result-card { background: #f0fdf4; border: 1px solid #bbf7d0; border-radius: var(--radius-lg); padding: 1.25rem 1.5rem; margin-top: 1.5rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.uc-result-text { font-size: 1.35rem; font-weight: 800; color: #166534; word-break: break-all; min-width: 0; flex: 1; }
.uc-result-sub { font-size: 0.88rem; color: #15803d; font-weight: 500; }
.uc-copy-btn { padding: 0.55rem 1.1rem; font-size: 0.88rem; font-weight: 700; border-radius: var(--radius-md); border: none; background: #16a34a; color: #fff; cursor: pointer; transition: background 0.2s; display: inline-flex; align-items: center; gap: 0.4rem; flex-shrink: 0; }
.uc-copy-btn:hover { background: #15803d; }

.uc-formula-card { background: #f8fafc; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem 1.5rem; margin: 1.5rem 0; font-size: 0.95rem; color: var(--text); word-break: break-word; }
.uc-formula-title { font-weight: 700; margin-bottom: 0.3rem; color: var(--primary); }

.uc-table-wrap { overflow-x: auto; margin: 1.5rem 0 2.5rem; border: 1px solid var(--border); border-radius: var(--radius-lg); -webkit-overflow-scrolling: touch; }
.uc-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.92rem; }
.uc-table th, .uc-table td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); }
.uc-table th { background: #f8fafc; font-weight: 700; color: var(--text); }
.uc-table tr:last-child td { border-bottom: none; }
.uc-table tr:nth-child(even) { background: #fafafa; }

.uc-breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--muted); margin-bottom: 1rem; flex-wrap: wrap; }
.uc-breadcrumb a { color: var(--primary); text-decoration: none; font-weight: 600; }
.uc-breadcrumb a:hover { text-decoration: underline; }

/* Mobile overrides for Unit Converter */
@media (max-width: 640px) {
  .uc-hero { padding: 1.75rem 0 1.5rem; }
  .uc-hero h1 { font-size: 1.55rem; }
  .uc-hero p { font-size: 0.92rem; margin-bottom: 1rem; }
  .uc-search-input { font-size: 0.9rem; padding: 0.75rem 1rem 0.75rem 2.5rem; }
  .uc-grid { grid-template-columns: 1fr; gap: 0.75rem; margin: 1.25rem 0 2rem; }
  .uc-converter-box { padding: 1.25rem 1rem; margin: 1rem 0 1.5rem; border-radius: var(--radius-lg); }
  .uc-input, .uc-select { font-size: 0.97rem; padding: 0.7rem 0.85rem; }
  .uc-result-card { padding: 1rem; gap: 0.75rem; }
  .uc-result-text { font-size: 1.1rem; }
  .uc-copy-btn { width: 100%; justify-content: center; }
  .uc-formula-card { padding: 1rem; font-size: 0.88rem; }
  .uc-table th, .uc-table td { padding: 0.6rem 0.75rem; font-size: 0.85rem; white-space: nowrap; }
}
.uc-section { margin: 2.5rem 0 0; content-visibility: auto; contain-intrinsic-size: auto 500px; }
.uc-quick { background: linear-gradient(135deg, #eff6ff, #f0fdf4); border: 1px solid #bfdbfe; border-radius: var(--radius-lg); padding: 1.25rem 1.4rem; }
.uc-quick p { font-size: 1.02rem; color: var(--text); margin: 0.4rem 0 0; line-height: 1.65; }
.uc-section h2 { font-size: 1.35rem; font-weight: 800; letter-spacing: -0.01em; margin: 0 0 0.4rem; color: var(--text); }
.uc-sec-sub { color: var(--muted); font-size: 0.92rem; margin: 0 0 1.1rem; }
.uc-formula-inv { margin-top: 0.35rem; color: var(--muted); font-size: 0.9rem; }
.uc-reverse { margin-top: 1rem; text-align: center; }
.uc-reverse a { display: inline-block; font-weight: 700; color: var(--primary); text-decoration: none; border: 1px solid var(--border); padding: 0.6rem 1.2rem; border-radius: 999px; background: #fff; transition: all 0.15s; }
.uc-reverse a:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(26,115,232,0.15); }
.uc-examples { display: grid; gap: 0.9rem; }
.uc-ex-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.1rem 1.25rem; }
.uc-ex-card h3 { font-size: 1rem; margin: 0 0 0.5rem; color: var(--text); }
.uc-ex-card ol { margin: 0; padding-left: 1.3rem; color: var(--muted); font-size: 0.92rem; display: grid; gap: 0.3rem; }
.uc-ex-card ol b { color: #166534; }
.uc-pop-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 0.55rem; }
.uc-pop-link { display: block; padding: 0.6rem 0.85rem; border: 1px solid var(--border); border-radius: 10px; text-decoration: none; color: var(--text); font-weight: 600; font-size: 0.86rem; background: #fff; transition: all 0.15s; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.uc-pop-link:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,115,232,0.12); }
.uc-pop-link[aria-current="page"] { border-color: var(--primary); background: #eff6ff; color: var(--primary); }
.uc-pair-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0.65rem; }
.uc-pair-card { display: flex; flex-direction: column; gap: 0.35rem; padding: 0.7rem 0.9rem; background: #fff; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--text); transition: all 0.15s; }
.uc-pair-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 6px 18px rgba(26,115,232,0.14); }
.uc-pair-card[aria-current="page"] { border-color: var(--primary); background: #eff6ff; }
.uc-pair-top { display: flex; align-items: center; gap: 0.45rem; font-weight: 700; font-size: 0.9rem; min-width: 0; }
.uc-pair-from { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.uc-pair-to { color: var(--primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.uc-pair-arrow { color: var(--muted); flex-shrink: 0; }
.uc-pair-val { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.78rem; color: var(--muted); background: #f1f5f9; border-radius: 8px; padding: 0.3rem 0.55rem; }
.uc-pair-card[aria-current="page"] .uc-pair-val { background: #dbeafe; }
.uc-unit-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 0.65rem; }
.uc-unit-card { display: flex; gap: 0.7rem; align-items: flex-start; padding: 0.75rem 0.9rem; background: #fff; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--text); transition: all 0.15s; }
.uc-unit-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 6px 18px rgba(26,115,232,0.14); }
.uc-unit-card[data-base="1"] { border-color: var(--primary); background: linear-gradient(180deg, #eff6ff, #fff); }
.uc-unit-sym { flex-shrink: 0; min-width: 2.6rem; height: 2.6rem; padding: 0 0.5rem; display: flex; align-items: center; justify-content: center; border-radius: 10px; background: linear-gradient(135deg, #1a73e8, #60a5fa); color: #fff; font-weight: 800; font-size: 0.85rem; }
.uc-unit-body { min-width: 0; }
.uc-unit-name { display: block; font-weight: 700; font-size: 0.9rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.uc-unit-val { display: block; font-size: 0.78rem; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; margin-top: 0.15rem; }
.uc-ex-card ol li:last-child { background: #f0fdf4; border-radius: 8px; padding: 0.3rem 0.6rem; margin-left: -0.6rem; }
.uc-about p { color: var(--muted); font-size: 0.94rem; line-height: 1.75; margin: 0 0 0.9rem; }
.uc-about p b { color: var(--text); }
.uc-fact { background: #fffbeb; border: 1px solid #fde68a; border-radius: 12px; padding: 0.85rem 1.1rem; color: #92400e; font-size: 0.9rem; }
.uc-updated { color: var(--muted); font-size: 0.78rem; margin-top: 0.4rem; }
.uc-table td code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: #f1f5f9; padding: 0.1rem 0.4rem; border-radius: 6px; font-size: 0.82rem; }
.uc-toc { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; max-width: 1120px; margin: 0 auto 1rem; padding: 0.7rem 1rem; background: #fff; border: 1px solid var(--border); border-radius: 12px; }
.uc-toc-title { font-weight: 800; font-size: 0.82rem; color: var(--muted); }
.uc-toc a { font-size: 0.82rem; font-weight: 600; color: var(--primary); text-decoration: none; background: #eff6ff; padding: 0.3rem 0.75rem; border-radius: 999px; transition: all 0.15s; }
.uc-toc a:hover { background: var(--primary); color: #fff; }
.uc-share-wrap { display: grid; grid-template-columns: 300px 1fr; gap: 1.2rem; align-items: start; }
.uc-share-card { aspect-ratio: 2 / 3; border-radius: 18px; padding: 1.5rem 1.2rem; color: #fff; display: flex; flex-direction: column; align-items: center; text-align: center; background: linear-gradient(160deg, hsl(var(--sh), 70%, 34%), hsl(var(--sh2), 75%, 16%)); box-shadow: 0 12px 32px rgba(0,0,0,0.25); position: relative; overflow: hidden; }
.uc-share-card::before { content: ""; position: absolute; width: 280px; height: 280px; border-radius: 50%; background: rgba(255,255,255,0.07); top: -110px; right: -110px; }
.uc-share-card::after { content: ""; position: absolute; width: 320px; height: 320px; border-radius: 50%; background: rgba(255,255,255,0.05); bottom: -140px; left: -140px; }
.uc-share-brand { font-size: 0.68rem; letter-spacing: 0.16em; opacity: 0.85; font-weight: 800; position: relative; z-index: 1; }
.uc-share-sym { font-size: 2.4rem; font-weight: 800; margin-top: 1.1rem; position: relative; z-index: 1; }
.uc-share-sym span { opacity: 0.6; margin: 0 0.35rem; }
.uc-share-pair { font-size: 0.9rem; opacity: 0.9; margin-top: 0.25rem; position: relative; z-index: 1; }
.uc-share-val { font-size: 1.25rem; font-weight: 800; background: rgba(255,255,255,0.16); border-radius: 12px; padding: 0.55rem 0.8rem; margin-top: 1rem; position: relative; z-index: 1; }
.uc-share-url { margin-top: auto; padding-top: 1rem; font-size: 0.7rem; opacity: 0.8; word-break: break-all; position: relative; z-index: 1; }
.uc-share-side { display: grid; gap: 0.7rem; align-content: start; }
.uc-btn { display: inline-block; text-align: center; font-weight: 700; font-size: 0.92rem; padding: 0.75rem 1.3rem; border-radius: 12px; border: 1px solid var(--primary); background: var(--primary); color: #fff; cursor: pointer; text-decoration: none; transition: all 0.15s; }
.uc-btn:hover { filter: brightness(1.08); transform: translateY(-1px); box-shadow: 0 6px 18px rgba(26,115,232,0.25); }
.uc-btn-pin { background: #bd081c; border-color: #bd081c; }
.uc-btn-pin:hover { box-shadow: 0 6px 18px rgba(189,8,28,0.3); }
.uc-btn-ghost { background: #fff; color: var(--text); border-color: var(--border); }
@media (max-width: 640px) { .uc-share-wrap { grid-template-columns: 1fr; } .uc-share-card { max-width: 300px; } }
.uc-howto-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.8rem; counter-reset: ucstep; }
.uc-howto-list li { counter-increment: ucstep; position: relative; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1rem 1.1rem 1rem 3.4rem; }
.uc-howto-list li::before { content: counter(ucstep); position: absolute; left: 1rem; top: 1rem; width: 1.7rem; height: 1.7rem; border-radius: 50%; background: linear-gradient(135deg, #1a73e8, #60a5fa); color: #fff; font-weight: 800; font-size: 0.85rem; display: flex; align-items: center; justify-content: center; }
.uc-howto-list b { display: block; font-size: 0.95rem; margin-bottom: 0.2rem; }
.uc-howto-list p { margin: 0; font-size: 0.88rem; color: var(--muted); }
.uc-faq { display: grid; gap: 0.6rem; }
.uc-faq-item { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 0.9rem 1.1rem; }
.uc-faq-item summary { cursor: pointer; font-weight: 700; font-size: 0.94rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.uc-faq-item summary::-webkit-details-marker { display: none; }
.uc-faq-item summary::after { content: "+"; color: var(--primary); font-weight: 800; font-size: 1.15rem; flex-shrink: 0; }
.uc-faq-item[open] summary::after { content: "−"; }
.uc-faq-item p { color: var(--muted); font-size: 0.9rem; line-height: 1.65; margin: 0.6rem 0 0; }
.uc-rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 0.6rem; }
.uc-rel-card { display: flex; align-items: center; gap: 0.6rem; padding: 0.75rem 0.9rem; background: #fff; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--text); font-weight: 600; font-size: 0.88rem; transition: all 0.15s; }
.uc-rel-card:hover { border-color: var(--primary); transform: translateY(-1px); }
.uc-rel-ico { font-size: 1.2rem; }
@media (pointer: coarse) {
  .uc-pop-link, .uc-rel-card, .uc-faq-item summary { min-height: 44px; }
  .uc-copy-btn, .uc-swap-btn { min-height: 44px; min-width: 44px; }
}
@media (max-width: 640px) {
  .uc-pop-grid { grid-template-columns: 1fr 1fr; }
  .uc-rel-grid { grid-template-columns: repeat(2, 1fr); }
  .uc-ex-card { padding: 1rem; }
}
.uc-combo { position: relative; min-width: 0; }
.uc-combo select.uc-select { position: absolute; opacity: 0; pointer-events: none; width: 100%; height: 100%; }
.uc-combo-btn { width: 100%; padding: 0.8rem 2.4rem 0.8rem 1rem; font-size: 1.1rem; border-radius: var(--radius-md); border: 1px solid var(--input-border); background: var(--bg); color: var(--text); font-weight: 600; cursor: pointer; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; position: relative; box-sizing: border-box; }
.uc-combo-btn::after { content: ""; position: absolute; right: 1rem; top: 50%; width: 0.55rem; height: 0.55rem; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: translateY(-70%) rotate(45deg); pointer-events: none; }
.uc-combo-btn:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15); outline: none; }
.uc-combo-drop { position: absolute; top: calc(100% + 6px); left: 0; right: 0; background: var(--bg, #fff); border: 1px solid var(--border, #e5e7eb); border-radius: 12px; box-shadow: 0 12px 32px rgba(0,0,0,0.16); z-index: 60; overflow: hidden; display: none; }
.uc-combo.open .uc-combo-drop { display: block; }
.uc-combo-search { width: 100%; box-sizing: border-box; padding: 0.7rem 0.9rem; font-size: 0.95rem; border: none; border-bottom: 1px solid var(--border, #e5e7eb); background: transparent; color: var(--text); outline: none; }
.uc-combo-list { max-height: 260px; overflow-y: auto; padding: 0.35rem; }
.uc-combo-opt { display: flex; align-items: center; gap: 0.6rem; width: 100%; box-sizing: border-box; padding: 0.55rem 0.7rem; border: none; background: transparent; color: var(--text); font-size: 0.92rem; border-radius: 8px; cursor: pointer; text-align: left; }
.uc-combo-opt:hover, .uc-combo-opt.active { background: #eff6ff; }
.uc-combo-opt[aria-selected="true"] { color: var(--primary); font-weight: 700; }
.uc-combo-sym { flex-shrink: 0; min-width: 2.2rem; text-align: center; font-size: 0.75rem; font-weight: 800; background: #f1f5f9; color: var(--muted); border-radius: 6px; padding: 0.2rem 0.3rem; }
.uc-combo-empty { padding: 0.9rem; text-align: center; color: var(--muted); font-size: 0.88rem; }
@media (max-width: 640px) {
  .uc-combo-btn { font-size: 0.97rem; padding: 0.7rem 2.2rem 0.7rem 0.85rem; }
  .uc-combo-list { max-height: 220px; }
  .uc-combo-drop { position: fixed; left: 1rem; right: 1rem; top: auto; bottom: 1rem; max-height: 60vh; display: none; flex-direction: column; }
  .uc-combo.open .uc-combo-drop { display: flex; }
  .uc-combo-list { flex: 1; }
}