/* ═══════════════════════════════════════════════════════════════
   PCBuilder Pro v5 — 設計系統（全面優化版）
   ═══════════════════════════════════════════════════════════════ */
:root {
  --bg:        #040d1a;
  --bg2:       #071428;
  --bg3:       #0a1f3d;
  --bg4:       #0d2548;
  --cyan:      #00d4ff;
  --blue:      #0066ff;
  --purple:    #7c3aed;
  --green:     #00ff88;
  --orange:    #ff6b35;
  --red:       #ff3b5c;
  --txt:       #e2f0ff;
  --txt2:      #8ab4d4;
  --txt3:      #4a6b8a;
  --border:    rgba(0,212,255,0.18);
  --border2:   rgba(0,212,255,0.08);
  --glow:      0 0 20px rgba(0,212,255,0.14);
  --shadow:    0 4px 24px rgba(0,0,0,0.55);
  --font:      'Exo 2',sans-serif;
  --mono:      'Share Tech Mono',monospace;
  /* 字體縮放（預設 medium=1） */
  --fs-scale:  1;
}
/* 字體大小方案 */
body.fs-small  { --fs-scale: 0.88; }
body.fs-medium { --fs-scale: 1;    }
body.fs-large  { --fs-scale: 1.13; }

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--txt);min-height:100vh;overflow-x:hidden;
  font-size:calc(14px * var(--fs-scale))}
body::before{content:'';position:fixed;inset:0;
  background-image:linear-gradient(rgba(0,212,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(0,212,255,.025) 1px,transparent 1px);
  background-size:44px 44px;pointer-events:none;z-index:0}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--cyan);border-radius:3px;opacity:.5}
#app{position:relative;z-index:1}

/* ── Topbar ──────────────────────────────────────────────────── */
#topbar{
  position:sticky;top:0;z-index:100;
  background:rgba(4,13,26,.92);backdrop-filter:blur(18px);
  border-bottom:1px solid var(--border);
  padding:0 1.25rem;height:56px;
  display:flex;align-items:center;justify-content:space-between;gap:.5rem}
.logo{font-size:calc(1.2rem * var(--fs-scale));font-weight:900;letter-spacing:.04em;color:var(--cyan);
  text-shadow:0 0 18px rgba(0,212,255,.55);user-select:none;white-space:nowrap;flex-shrink:0}
.logo span{color:var(--txt)}
.nav-tabs{display:flex;gap:.2rem;overflow-x:auto;flex-shrink:1;flex:1;justify-content:center}
.nav-tabs::-webkit-scrollbar{height:0}
.nav-tab{padding:.35rem .9rem;border:1px solid transparent;border-radius:6px;
  background:transparent;color:var(--txt2);font-family:var(--font);
  font-size:calc(.82rem * var(--fs-scale));font-weight:600;
  cursor:pointer;transition:all .2s;white-space:nowrap}
.nav-tab:hover{color:var(--cyan);border-color:var(--border)}
.nav-tab.active{color:var(--cyan);border-color:var(--cyan);background:rgba(0,212,255,.08);
  box-shadow:0 0 10px rgba(0,212,255,.18)}
.topbar-right{display:flex;gap:.4rem;align-items:center;flex-shrink:0}
#topbar-total{font-family:var(--mono);font-size:calc(.85rem * var(--fs-scale));
  color:var(--cyan);white-space:nowrap}

/* 字體大小切換按鈕 */
.fs-switcher{display:flex;gap:.2rem;align-items:center}
.fs-btn{background:transparent;border:1px solid var(--border2);color:var(--txt3);
  padding:.2rem .42rem;border-radius:5px;cursor:pointer;font-family:var(--mono);
  font-size:.72rem;transition:all .2s;line-height:1}
.fs-btn:hover{border-color:var(--border);color:var(--txt2)}
.fs-btn.active{border-color:var(--cyan);color:var(--cyan);background:rgba(0,212,255,.1)}

/* ── Pages ───────────────────────────────────────────────────── */
.page{display:none;padding:1.25rem;max-width:1800px;margin:0 auto}
.page.active{display:block}
.page-h1{font-size:calc(1.15rem * var(--fs-scale));font-weight:800;letter-spacing:.02em}

/* ── Card ────────────────────────────────────────────────────── */
.card{background:var(--bg3);border:1px solid var(--border2);border-radius:12px;padding:1.1rem;
  transition:border-color .2s,box-shadow .2s}
.card:hover{border-color:var(--border);box-shadow:var(--glow)}
.card-title{font-size:calc(.72rem * var(--fs-scale));font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--cyan);margin-bottom:.85rem;display:flex;align-items:center;gap:.45rem}
.card-title::before{content:'';display:inline-block;width:3px;height:13px;
  background:var(--cyan);border-radius:2px;box-shadow:0 0 7px var(--cyan)}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:.35rem;padding:.48rem .95rem;
  border-radius:8px;font-family:var(--font);font-size:calc(.84rem * var(--fs-scale));font-weight:600;
  cursor:pointer;transition:all .2s;border:none;text-decoration:none}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;
  box-shadow:0 0 14px rgba(0,212,255,.28)}
.btn-primary:hover{box-shadow:0 0 22px rgba(0,212,255,.46);transform:translateY(-1px)}
.btn-danger{background:rgba(255,59,92,.14);color:var(--red);border:1px solid rgba(255,59,92,.28)}
.btn-danger:hover{background:rgba(255,59,92,.24)}
.btn-ghost{background:transparent;color:var(--txt2);border:1px solid var(--border2)}
.btn-ghost:hover{border-color:var(--border);color:var(--txt)}
.btn-sm{padding:.3rem .7rem;font-size:calc(.78rem * var(--fs-scale))}
.btn-icon{background:transparent;border:1px solid var(--border2);color:var(--txt3);
  padding:.3rem .55rem;border-radius:6px;cursor:pointer;transition:all .2s;
  font-size:calc(.84rem * var(--fs-scale))}
.btn-icon:hover{border-color:var(--border);color:var(--cyan)}

/* ── Input ───────────────────────────────────────────────────── */
.input-tech{background:rgba(0,20,50,.6);border:1px solid var(--border2);border-radius:8px;
  padding:.52rem .9rem;color:var(--txt);font-family:var(--font);
  font-size:calc(.9rem * var(--fs-scale));
  width:100%;transition:border-color .2s,box-shadow .2s;outline:none}
.input-tech:focus{border-color:var(--cyan);box-shadow:0 0 10px rgba(0,212,255,.18)}
.input-tech::placeholder{color:var(--txt3)}

/* ══════════════════════════════════════════════════════════════
   配單頁版面（問題 7：左中右欄比例優化）
   ══════════════════════════════════════════════════════════════ */
/* 三欄：左 280px · 中 1fr · 右 310px */
#builder-layout{
  display:grid;
  grid-template-columns:280px 1fr 310px;
  gap:.85rem;
  align-items:start}

/* 中欄：3D預覽 + 效能面板上下排列 */
#builder-center{display:flex;flex-direction:column;gap:.85rem}

/* 右欄：總價 + 功耗 + 相容性（效能面板已移到中欄）*/
#builder-right{display:flex;flex-direction:column;gap:.85rem}

/* 響應式：1400px以下，右欄降到下面；1100px以下單欄 */
@media(max-width:1400px){
  #builder-layout{grid-template-columns:260px 1fr}
  #builder-right{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem}
}
@media(max-width:1100px){
  #builder-layout{grid-template-columns:1fr}
  #builder-right{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:720px){
  #builder-layout{grid-template-columns:1fr}
  #builder-right{grid-template-columns:1fr}
}

/* ── Part Slots ──────────────────────────────────────────────── */
.part-slot{display:flex;align-items:center;gap:.6rem;padding:.6rem .7rem;
  border:1px dashed var(--border2);border-radius:10px;cursor:pointer;
  transition:all .2s;margin-bottom:.35rem;position:relative;min-height:54px}
.part-slot:hover{border-color:var(--cyan);background:rgba(0,212,255,.04)}
.part-slot.filled{border-style:solid;border-color:var(--border);background:rgba(0,212,255,.05)}
.part-slot.filled:hover{border-color:var(--cyan)}
.part-slot.error{border-color:var(--red)!important;background:rgba(255,59,92,.05)}
.slot-icon{width:34px;height:34px;border-radius:8px;background:rgba(0,212,255,.1);
  display:flex;align-items:center;justify-content:center;
  font-size:calc(.95rem * var(--fs-scale));color:var(--cyan);flex-shrink:0}
.slot-icon.filled{background:rgba(0,212,255,.18)}
.slot-info{flex:1;min-width:0}
.slot-label{font-size:calc(.66rem * var(--fs-scale));color:var(--txt3);text-transform:uppercase;
  letter-spacing:.1em;font-weight:700}
.slot-value{font-size:calc(.84rem * var(--fs-scale));color:var(--txt);font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.slot-price{font-family:var(--mono);font-size:calc(.8rem * var(--fs-scale));
  color:var(--green);white-space:nowrap;flex-shrink:0}
.slot-remove{position:absolute;right:7px;top:7px;width:18px;height:18px;border-radius:50%;
  background:rgba(255,59,92,.2);color:var(--red);border:none;cursor:pointer;
  display:none;align-items:center;justify-content:center;font-size:.62rem;transition:background .2s}
.part-slot.filled .slot-remove{display:flex}
.slot-remove:hover{background:rgba(255,59,92,.4)}

/* ── Qty badge ───────────────────────────────────────────────── */
.qty-badge{display:inline-flex;align-items:center;gap:.3rem;font-family:var(--mono);
  font-size:calc(.72rem * var(--fs-scale));color:var(--cyan);background:rgba(0,212,255,.1);
  border:1px solid var(--border);border-radius:20px;padding:.1rem .5rem;flex-shrink:0}
.qty-btn{background:transparent;border:none;color:var(--cyan);cursor:pointer;font-size:.9rem;
  line-height:1;padding:0 .15rem;transition:color .2s}
.qty-btn:hover{color:#fff}

/* ── Storage Sub-tabs ────────────────────────────────────────── */
.sub-tabs{display:flex;gap:.3rem;margin-bottom:.6rem;flex-wrap:wrap}
.sub-tab{padding:.22rem .65rem;border:1px solid var(--border2);border-radius:14px;
  background:transparent;color:var(--txt3);font-size:calc(.75rem * var(--fs-scale));
  font-weight:600;cursor:pointer;transition:all .2s}
.sub-tab:hover{border-color:var(--border);color:var(--txt2)}
.sub-tab.active{border-color:var(--cyan);color:var(--cyan);background:rgba(0,212,255,.1)}

/* ── Modal ───────────────────────────────────────────────────── */
#modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.72);
  backdrop-filter:blur(7px);z-index:200;align-items:center;justify-content:center;padding:1rem}
#modal-overlay.open{display:flex}
#part-modal{background:var(--bg3);border:1px solid var(--border);border-radius:16px;
  width:min(960px,96vw);max-height:90vh;display:flex;flex-direction:column;
  box-shadow:0 0 60px rgba(0,212,255,.13);overflow:hidden}
#modal-header{padding:1rem 1.25rem;border-bottom:1px solid var(--border2);
  display:flex;align-items:center;justify-content:space-between;gap:.5rem}
#modal-header h2{font-size:calc(.95rem * var(--fs-scale));font-weight:700;color:var(--cyan);flex:1}
#modal-close{background:transparent;border:none;color:var(--txt3);font-size:1.1rem;
  cursor:pointer;padding:.25rem .5rem;border-radius:6px;transition:color .2s}
#modal-close:hover{color:var(--red)}
#modal-filter-bar{padding:.6rem 1.25rem;border-bottom:1px solid var(--border2)}
#modal-parts-list{flex:1;overflow-y:auto;padding:.85rem 1.25rem}

/* ── Part Item (modal list) ──────────────────────────────────── */
.part-item{display:flex;align-items:center;gap:.85rem;padding:.72rem;
  border:1px solid var(--border2);border-radius:10px;margin-bottom:.4rem;
  cursor:pointer;transition:all .2s}
.part-item:hover{border-color:var(--cyan);background:rgba(0,212,255,.05);transform:translateX(2px)}
.part-item.selected{border-color:var(--green);background:rgba(0,255,136,.05)}
.part-item-icon{width:42px;height:42px;border-radius:9px;background:rgba(0,212,255,.08);
  display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--cyan);flex-shrink:0}
.part-item-info{flex:1;min-width:0}
.part-item-brand{font-size:calc(.68rem * var(--fs-scale));color:var(--txt3);font-weight:700;
  text-transform:uppercase;letter-spacing:.1em}
.part-item-name{font-size:calc(.88rem * var(--fs-scale));font-weight:700;color:var(--txt)}
.part-item-specs{font-size:calc(.76rem * var(--fs-scale));color:var(--txt2);margin-top:.15rem;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.part-item-right{text-align:right;flex-shrink:0}
.part-item-price{font-family:var(--mono);font-size:calc(.95rem * var(--fs-scale));
  color:var(--green);font-weight:700}
.part-item-tags{display:flex;flex-wrap:wrap;gap:.2rem;justify-content:flex-end;margin-top:.2rem}

/* ── Tags ────────────────────────────────────────────────────── */
.tag{display:inline-block;padding:.08rem .38rem;border-radius:4px;
  font-size:calc(.62rem * var(--fs-scale));font-weight:700;letter-spacing:.04em}
.tag-c{background:rgba(0,212,255,.14);color:var(--cyan)}
.tag-g{background:rgba(0,255,136,.14);color:var(--green)}
.tag-p{background:rgba(124,58,237,.2);color:#a78bfa}
.tag-o{background:rgba(255,107,53,.14);color:var(--orange)}

/* ── Compat Panel ────────────────────────────────────────────── */
.compat-item{display:flex;gap:.6rem;padding:.55rem .75rem;border-radius:8px;
  margin-bottom:.4rem;font-size:calc(.8rem * var(--fs-scale));line-height:1.45;align-items:flex-start}
.compat-item.error{background:rgba(255,59,92,.09);border:1px solid rgba(255,59,92,.28);color:#ffa0b0}
.compat-item.warning{background:rgba(255,107,53,.09);border:1px solid rgba(255,107,53,.28);color:#ffb88a}
.compat-item.info{background:rgba(0,255,136,.07);border:1px solid rgba(0,255,136,.24);color:#88ffcc}

/* ── Power Bar ───────────────────────────────────────────────── */
.power-bar-wrap{position:relative;height:9px;background:rgba(255,255,255,.05);border-radius:5px;overflow:hidden;margin:.4rem 0}
.power-bar{height:100%;border-radius:5px;transition:width .5s ease,background .5s;position:relative}
.power-bar::after{content:'';position:absolute;right:0;top:0;bottom:0;width:18px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.35));animation:shimmer 1.5s infinite}
@keyframes shimmer{0%,100%{opacity:.5}50%{opacity:1}}
.power-row{display:flex;justify-content:space-between;align-items:center;
  padding:.2rem 0;font-size:calc(.82rem * var(--fs-scale))}
.power-row .mono{font-family:var(--mono)}

/* ── Shop Buttons ────────────────────────────────────────────── */
.shop-btn{display:inline-flex;align-items:center;gap:.3rem;padding:.32rem .7rem;
  border-radius:6px;font-size:calc(.76rem * var(--fs-scale));font-weight:700;
  text-decoration:none;transition:all .2s}
.shop-pchome{background:rgba(255,140,0,.14);color:#ffaa44;border:1px solid rgba(255,140,0,.28)}
.shop-momo{background:rgba(255,60,120,.14);color:#ff7aaa;border:1px solid rgba(255,60,120,.28)}
.shop-shopee{background:rgba(255,90,0,.14);color:#ff9955;border:1px solid rgba(255,90,0,.28)}
.shop-official{background:rgba(0,212,255,.09);color:var(--cyan);border:1px solid var(--border)}
.shop-btn:hover{filter:brightness(1.2);transform:translateY(-1px)}

/* ── 3D Preview ──────────────────────────────────────────────── */
#preview-wrap{position:relative;background:radial-gradient(ellipse at 50% 40%,#0d2040,#020810);
  border-radius:12px;overflow:hidden;height:420px}
#preview-canvas{display:block;width:100%;height:100%}
#preview-hint{position:absolute;bottom:10px;right:12px;font-size:.68rem;
  color:var(--txt3);font-family:var(--mono);pointer-events:none}
#preview-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(4,13,26,.7);backdrop-filter:blur(4px);z-index:10;pointer-events:none}
#preview-empty-msg{position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;color:var(--txt3);pointer-events:none}
.preview-legend{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.5rem}
.legend-item{font-size:calc(.68rem * var(--fs-scale));color:var(--txt3);
  background:rgba(0,212,255,.06);border:1px solid var(--border2);border-radius:5px;
  padding:.1rem .45rem;display:flex;align-items:center;gap:.3rem}
.legend-item i{color:var(--cyan);font-size:.6rem}

/* ── Price Chart ─────────────────────────────────────────────── */
.chart-wrap{position:relative}
.price-stat-row{display:flex;gap:.55rem;margin-bottom:.65rem}
.price-stat{flex:1;text-align:center;padding:.45rem .35rem;border-radius:8px}
.price-stat.low{background:rgba(0,255,136,.07);border:1px solid rgba(0,255,136,.2)}
.price-stat.high{background:rgba(255,59,92,.07);border:1px solid rgba(255,59,92,.2)}
.price-stat.cur{background:rgba(0,212,255,.07);border:1px solid var(--border)}
.price-stat-val{font-family:var(--mono);font-size:calc(.92rem * var(--fs-scale));font-weight:700}
.price-stat-lbl{font-size:calc(.62rem * var(--fs-scale));color:var(--txt3);
  text-transform:uppercase;letter-spacing:.1em;margin-top:.1rem}

/* ── Perf Score ──────────────────────────────────────────────── */
.perf-summary{display:flex;align-items:center;gap:1rem;margin-bottom:.75rem;
  padding:.65rem;background:rgba(0,212,255,.04);border-radius:10px;border:1px solid var(--border2)}
.perf-summary-info{flex:1}
.perf-tier-badge{display:inline-block;padding:.18rem .6rem;border-radius:6px;
  font-size:calc(.72rem * var(--fs-scale));font-weight:700;margin-top:.25rem}
.fps-section-title{font-size:calc(.72rem * var(--fs-scale));font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;color:var(--txt3);margin:.55rem 0 .35rem}
.fps-table{width:100%;border-collapse:collapse;font-size:calc(.78rem * var(--fs-scale))}
.fps-table th{padding:.4rem .5rem;color:var(--txt3);font-size:calc(.68rem * var(--fs-scale));
  text-transform:uppercase;letter-spacing:.08em;border-bottom:1px solid var(--border2);
  text-align:center;font-weight:700}
.fps-table td{padding:.35rem .5rem;border-bottom:1px solid rgba(255,255,255,.04);
  text-align:center;color:var(--txt2)}
.fps-table td:first-child{text-align:left;color:var(--txt);font-weight:600}
.fps-table tr:hover td{background:rgba(0,212,255,.03)}
.fps-good{color:var(--green)!important;font-weight:700}
.fps-ok{color:var(--cyan)!important}
.fps-warn{color:var(--orange)!important}
.fps-bad{color:var(--red)!important}
.fps-legend{display:flex;gap:.75rem;margin-top:.35rem;font-size:calc(.68rem * var(--fs-scale))}
.rating-badge{display:inline-block;padding:.1rem .4rem;border-radius:4px;font-size:.65rem;font-weight:700}
.rating-AP{background:rgba(0,255,136,.2);color:var(--green);border:1px solid rgba(0,255,136,.4)}
.rating-A{background:rgba(0,255,136,.15);color:var(--green)}
.rating-B{background:rgba(0,212,255,.12);color:var(--cyan)}
.rating-C{background:rgba(255,107,53,.14);color:var(--orange)}
.rating-D{background:rgba(255,59,92,.12);color:var(--red)}

/* ══════════════════════════════════════════════════════════════
   市場頁面
   ══════════════════════════════════════════════════════════════ */
#market-layout{display:grid;grid-template-columns:1fr 340px;gap:1rem;align-items:start}
.market-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:.75rem}
.market-card{background:var(--bg3);border:1px solid var(--border2);border-radius:12px;
  padding:.9rem;cursor:pointer;transition:all .25s}
.market-card:hover{border-color:var(--border);transform:translateY(-2px);box-shadow:var(--glow)}
.market-card-brand{font-size:calc(.65rem * var(--fs-scale));color:var(--txt3);
  text-transform:uppercase;letter-spacing:.08em;font-weight:700}
.market-card-name{font-size:calc(.83rem * var(--fs-scale));font-weight:700;line-height:1.3}
.market-price{font-family:var(--mono);font-size:calc(1.05rem * var(--fs-scale));color:var(--green);font-weight:700}
.chg-up{color:var(--red);font-size:calc(.75rem * var(--fs-scale));font-weight:700}
.chg-dn{color:var(--green);font-size:calc(.75rem * var(--fs-scale));font-weight:700}

/* 排序列 */
.sort-bar{display:flex;align-items:center;gap:.5rem;margin-bottom:.65rem;flex-wrap:wrap}
.sort-bar label{font-size:calc(.72rem * var(--fs-scale));color:var(--txt3);white-space:nowrap}
.sort-btn{padding:.2rem .55rem;border:1px solid var(--border2);border-radius:14px;
  background:transparent;color:var(--txt3);font-size:calc(.72rem * var(--fs-scale));
  font-weight:600;cursor:pointer;transition:all .2s}
.sort-btn:hover{border-color:var(--border);color:var(--txt2)}
.sort-btn.active{border-color:var(--cyan);color:var(--cyan);background:rgba(0,212,255,.09)}

/* ── Filter tabs ─────────────────────────────────────────────── */
.filter-tabs{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:.75rem}
.filter-tab{padding:.3rem .8rem;border:1px solid var(--border2);border-radius:18px;
  background:transparent;color:var(--txt3);
  font-size:calc(.78rem * var(--fs-scale));font-weight:600;cursor:pointer;transition:all .2s}
.filter-tab:hover{border-color:var(--border);color:var(--txt2)}
.filter-tab.active{border-color:var(--cyan);color:var(--cyan);background:rgba(0,212,255,.09)}

/* ── Spec row ────────────────────────────────────────────────── */
.spec-row{display:flex;justify-content:space-between;align-items:center;
  padding:.35rem 0;border-bottom:1px solid rgba(255,255,255,.04);
  font-size:calc(.8rem * var(--fs-scale))}
.spec-row:last-child{border-bottom:none}
.spec-k{color:var(--txt3)}
.spec-v{color:var(--txt);font-weight:600;text-align:right;max-width:55%}

/* ══════════════════════════════════════════════════════════════
   歷史行情頁面（問題 3：修正版面空曠問題）
   ══════════════════════════════════════════════════════════════ */
#prices-layout{
  display:grid;
  grid-template-columns:1fr 380px;
  gap:1rem;
  align-items:start}

/* 價格清單格線（填滿左側） */
.prices-grid{display:flex;flex-direction:column;gap:.45rem}
.price-list-item{display:flex;align-items:center;gap:.85rem;padding:.72rem .85rem;
  background:var(--bg3);border:1px solid var(--border2);border-radius:10px;
  cursor:pointer;transition:all .2s}
.price-list-item:hover{border-color:var(--cyan);background:rgba(0,212,255,.04);transform:translateX(2px)}
.price-list-item.active{border-color:var(--cyan);background:rgba(0,212,255,.06)}
.price-list-left{flex:1;min-width:0}
.price-list-right{text-align:right;flex-shrink:0;min-width:90px}

/* 右側詳情 sticky */
.prices-detail-sticky{position:sticky;top:72px;max-height:calc(100vh - 90px);overflow-y:auto}

/* 價格洞察格線 */
.price-insight-grid{display:grid;grid-template-columns:1fr 1fr;gap:.45rem;margin:.5rem 0}
.price-insight{background:rgba(0,212,255,.04);border:1px solid var(--border2);
  border-radius:8px;padding:.45rem .6rem;display:flex;flex-direction:column;gap:.2rem;
  font-size:calc(.76rem * var(--fs-scale))}
.price-insight span{color:var(--txt3)}
.price-insight strong{color:var(--txt);font-size:calc(.84rem * var(--fs-scale))}

/* ── Saved builds ────────────────────────────────────────────── */
.build-card{background:var(--bg3);border:1px solid var(--border2);border-radius:12px;
  padding:.95rem;margin-bottom:.65rem;transition:border-color .2s}
.build-card:hover{border-color:var(--border)}
.build-part-tag{display:inline-block;padding:.08rem .4rem;border-radius:4px;
  font-size:calc(.65rem * var(--fs-scale));background:rgba(0,212,255,.1);
  color:var(--cyan);border:1px solid var(--border2);margin:.1rem .1rem 0 0}

/* ══════════════════════════════════════════════════════════════
   比較頁面（縮小選零件區域 + 強化比較表格）
   ══════════════════════════════════════════════════════════════ */
#compare-selector-wrap{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:.75rem;
  margin-bottom:.85rem}

/* 左側可選列表：限制高度，強制滾動 */
#compare-source-list{max-height:220px;overflow-y:auto;
  border:1px solid var(--border2);border-radius:10px;padding:.35rem}
#compare-source-list .part-item{padding:.38rem .55rem;margin-bottom:.22rem}
#compare-source-list .part-item-icon{width:28px;height:28px;font-size:.82rem}
#compare-source-list .part-item-name{font-size:calc(.8rem * var(--fs-scale))}
#compare-source-list .part-item-brand{font-size:calc(.62rem * var(--fs-scale))}

/* 右側已選：同高 */
#compare-selected-list{max-height:220px;overflow-y:auto;
  border:1px solid var(--border2);border-radius:10px;padding:.35rem}
#compare-selected-list .part-item{padding:.38rem .55rem;margin-bottom:.22rem}
#compare-selected-list .part-item-name{font-size:calc(.8rem * var(--fs-scale))}

/* 比較 item 縮小版 */
.compare-item-sm{display:flex;align-items:center;gap:.55rem;padding:.38rem .55rem;
  border:1px solid var(--border2);border-radius:8px;margin-bottom:.22rem;
  cursor:pointer;transition:all .18s;font-size:calc(.8rem * var(--fs-scale))}
.compare-item-sm:hover{border-color:var(--cyan);background:rgba(0,212,255,.04)}
.compare-item-sm.selected{border-color:var(--green);background:rgba(0,255,136,.04)}

.compare-table{width:100%;border-collapse:collapse;font-size:calc(.82rem * var(--fs-scale))}
.compare-table th{padding:.55rem .85rem;color:var(--cyan);font-weight:700;text-align:center;
  min-width:140px;border-bottom:2px solid rgba(0,212,255,.25);
  background:rgba(0,212,255,.04)}
.compare-table th:first-child{text-align:left;color:var(--txt3);min-width:110px;background:transparent}
.compare-table td{padding:.4rem .85rem;text-align:center;border-bottom:1px solid rgba(255,255,255,.04)}
.compare-table td:first-child{text-align:left;color:var(--txt3);font-size:calc(.76rem * var(--fs-scale));
  white-space:nowrap}
.compare-table tr:hover td{background:rgba(0,212,255,.04)}
.best-val{color:var(--green)!important;font-weight:700}
/* 特殊行標色 */
.vfm-row td{background:rgba(0,255,136,.03)!important}
.vfm-row td:first-child{color:var(--green)!important}
/* 效能行 */
.perf-row td{background:rgba(0,212,255,.025)!important}
/* 標題分組行 */
.compare-section-row td{
  background:rgba(0,212,255,.06)!important;
  color:var(--txt3)!important;
  font-size:calc(.68rem * var(--fs-scale))!important;
  text-transform:uppercase;letter-spacing:.1em;font-weight:700;
  padding:.25rem .85rem!important}

/* ── Toast ───────────────────────────────────────────────────── */
#toast-container{position:fixed;bottom:1.2rem;right:1.2rem;z-index:9999;
  display:flex;flex-direction:column;gap:.4rem}
.toast{padding:.65rem 1.1rem;border-radius:10px;font-size:calc(.86rem * var(--fs-scale));
  font-weight:600;display:flex;align-items:center;gap:.45rem;
  animation:slideIn .3s ease,fadeOut .4s ease 2.5s forwards;
  box-shadow:var(--shadow);max-width:320px}
.toast-success{background:rgba(0,255,136,.13);border:1px solid rgba(0,255,136,.38);color:var(--green)}
.toast-error{background:rgba(255,59,92,.13);border:1px solid rgba(255,59,92,.38);color:var(--red)}
.toast-info{background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.32);color:var(--cyan)}
.toast-warning{background:rgba(255,107,53,.1);border:1px solid rgba(255,107,53,.32);color:var(--orange)}
@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}
@keyframes fadeOut{from{opacity:1}to{opacity:0;pointer-events:none}}

/* ── Misc ────────────────────────────────────────────────────── */
.fade-in{animation:fadeIn .28s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}
.pulse{animation:pulse 2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 8px rgba(0,212,255,.28)}50%{box-shadow:0 0 22px rgba(0,212,255,.55)}}
.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:2.5rem 1rem;color:var(--txt3);text-align:center;gap:.65rem}
.empty-state i{font-size:2.2rem;opacity:.28}
.empty-state p{font-size:calc(.88rem * var(--fs-scale))}
#total-price{font-family:var(--mono);font-size:calc(1.75rem * var(--fs-scale));font-weight:700;
  color:var(--cyan);text-shadow:0 0 18px rgba(0,212,255,.45)}

.sub-type-badge{display:inline-block;padding:.05rem .35rem;border-radius:4px;
  font-size:calc(.62rem * var(--fs-scale));font-weight:700;margin-left:.3rem}
.sub-nvme{background:rgba(0,212,255,.15);color:var(--cyan)}
.sub-sata{background:rgba(0,255,136,.13);color:var(--green)}
.sub-hdd{background:rgba(255,107,53,.13);color:var(--orange)}
.optional-tag{color:var(--txt3);font-weight:400;font-size:.85em}
.tdp-badge{display:inline-flex;align-items:center;gap:.25rem;padding:.15rem .5rem;
  border-radius:5px;font-size:calc(.72rem * var(--fs-scale));font-weight:700;
  background:rgba(255,107,53,.12);color:var(--orange);border:1px solid rgba(255,107,53,.25)}
.hist-badge{display:inline-flex;align-items:center;gap:.25rem;padding:.15rem .5rem;
  border-radius:5px;font-size:calc(.7rem * var(--fs-scale));
  background:rgba(0,212,255,.08);color:var(--txt2);border:1px solid var(--border2)}
.price-row{display:flex;justify-content:space-between;align-items:center;
  padding:.22rem 0;font-size:calc(.82rem * var(--fs-scale));border-bottom:1px solid rgba(255,255,255,.04)}
.price-row:last-child{border-bottom:none}
.price-val{font-family:var(--mono);color:var(--green)}

/* builder header */
.builder-header{display:flex;align-items:center;justify-content:space-between;
  margin-bottom:.85rem;gap:.75rem;flex-wrap:wrap}
.build-name-input{max-width:360px;font-size:calc(.95rem * var(--fs-scale));font-weight:700}

/* spinner */
.spinner{width:28px;height:28px;border:3px solid rgba(0,212,255,.15);
  border-top-color:var(--cyan);border-radius:50%;animation:spin .7s linear infinite;margin-right:.75rem}
@keyframes spin{to{transform:rotate(360deg)}}

/* ══════════════════════════════════════════════════════════════
   響應式（全面動態適配）
   ══════════════════════════════════════════════════════════════ */

/* 大螢幕 1600px+ */
@media(min-width:1600px){
  #builder-layout{grid-template-columns:300px 1fr 340px}
  .market-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
}

/* 中大螢幕 1200-1600px */
@media(max-width:1599px) and (min-width:1200px){
  #builder-layout{grid-template-columns:270px 1fr 300px}
}

/* 中螢幕 1200px */
@media(max-width:1200px){
  #market-layout{grid-template-columns:1fr 300px}
  #prices-layout{grid-template-columns:1fr 300px}
}

/* 平板/小螢幕 960px */
@media(max-width:960px){
  #market-layout{display:grid;grid-template-columns:1fr}
  #market-detail-panel{margin-top:.85rem;position:static}
  #prices-layout{display:grid;grid-template-columns:1fr}
  .prices-detail-sticky{position:static;max-height:none;margin-top:.85rem}
  /* 市場 grid 2欄 */
  .market-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
}

/* 手機版 768px */
@media(max-width:768px){
  .page{padding:.65rem .75rem}
  #topbar{flex-wrap:wrap;height:auto;padding:.5rem .75rem;gap:.3rem}
  .logo{font-size:1.05rem}
  .nav-tabs{width:100%;gap:.1rem;justify-content:flex-start;overflow-x:auto;padding-bottom:.1rem}
  .nav-tab{padding:.26rem .55rem;font-size:.74rem}
  .topbar-right{width:100%;justify-content:space-between}
  #topbar-total{font-size:.78rem}
  #part-modal{height:92vh;max-height:92vh}
  .market-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.55rem}
  #compare-selector-wrap{grid-template-columns:1fr}
  #compare-source-list,#compare-selected-list{max-height:160px}
  .builder-header{flex-direction:column;align-items:flex-start}
  .build-name-input{max-width:100%}
  .price-stat-row{gap:.35rem}
  .price-insight-grid{grid-template-columns:1fr 1fr}
  #builder-right{grid-template-columns:1fr!important}
  .fs-switcher{display:none}
  /* 配單頁面單欄 */
  #builder-layout{grid-template-columns:1fr!important}
  /* 效能表格滾動 */
  .fps-table{font-size:.76rem}
  .fps-table th,.fps-table td{padding:.3rem .35rem}
  /* 省略排序列文字 */
  .sort-bar label{display:none}
}

/* 超小螢幕 480px */
@media(max-width:480px){
  .page{padding:.5rem}
  .market-grid{grid-template-columns:1fr}
  .nav-tab{padding:.22rem .4rem;font-size:.7rem}
  .part-slot{padding:.5rem .55rem;gap:.4rem}
  .slot-icon{width:28px;height:28px;font-size:.82rem}
  .part-item{gap:.6rem;padding:.55rem}
  .price-insight-grid{grid-template-columns:1fr}
  .perf-summary{flex-direction:column;gap:.5rem}
  #preview-wrap{height:300px}
  .compare-table{font-size:.74rem}
  .compare-table th,.compare-table td{padding:.32rem .5rem}
}

/* 印刷/高對比模式 */
@media(prefers-reduced-motion:reduce){
  .fade-in,.pulse,.shimmer,@keyframes{animation:none!important}
  *{transition-duration:.01ms!important}
}