:root {
  color-scheme: light dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --bg: #f4f6fa;
  --panel: #fff;
  --ink: #202a3c;
  --muted: #707a8d;
  --accent: #d6ff79;
  --accent-strong: #b8eb55;
  --navy: #202e4f;
  --border: #e5e9f0;
  --soft: #f7f8fb;
  --shadow: 0 12px 36px rgb(32 46 79 / 7%);
  --shadow-small: 0 5px 18px rgb(32 46 79 / 6%);
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--ink); line-height: 1.55; }
a { color: var(--navy); }
.top { position: sticky; top: 0; z-index: 10; background: rgb(255 255 255 / 94%); border-bottom: 1px solid var(--border); backdrop-filter: blur(16px); }
.top-inner { max-width: 1240px; min-height: 82px; padding: .8rem 1.5rem; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--navy); text-decoration: none; flex: 0 0 auto; }
.brand img { width: 43px; height: 43px; display: block; }
.brand-copy { display: grid; gap: .02rem; line-height: 1.1; }
.brand-copy strong { font-size: 1.32rem; letter-spacing: -.055em; font-weight: 850; }
.brand-copy strong span { color: #6a8d27; }
.brand-copy small { margin-top: .18rem; color: var(--muted); font-size: .66rem; font-weight: 600; letter-spacing: .015em; }
nav { display: flex; align-items: center; gap: .35rem; flex-wrap: wrap; }
.nav-link { padding: .55rem .78rem; border-radius: 10px; color: #667087; text-decoration: none; font-size: .9rem; font-weight: 650; transition: background .15s ease, color .15s ease; }
.nav-link:hover { color: var(--navy); background: var(--soft); }
.nav-link.active { color: var(--navy); background: #eef3e4; }
nav form { margin: 0 0 0 .25rem; }
.logout { padding: .48rem .8rem; color: var(--muted); background: transparent; border: 1px solid var(--border); font-size: .85rem; }
.logout:hover { color: var(--navy); background: var(--soft); }
.wrap { max-width: 1240px; min-height: calc(100vh - 160px); padding: 2.15rem 1.5rem 4rem; margin: auto; }
h1, h2, h3, h4 { color: var(--navy); line-height: 1.2; letter-spacing: -.035em; }
h1 { margin: 0 0 .65rem; font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 790; }
h2 { margin: .15rem 0 .65rem; font-size: 1.24rem; font-weight: 740; }
h3 { margin: .1rem 0 .4rem; font-size: 1.05rem; font-weight: 720; }
p { color: var(--muted); }
.lede { max-width: 680px; margin: .5rem 0 1.6rem; font-size: 1.12rem; }
.panel { padding: 1.35rem; margin: 1rem 0; border: 1px solid var(--border); border-radius: 18px; background: var(--panel); box-shadow: var(--shadow-small); }
.narrow { max-width: 500px; margin: 5vh auto; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 1rem; }
.cards > .panel { min-height: 132px; margin: 0; display: flex; flex-direction: column; justify-content: center; gap: .35rem; color: inherit; text-decoration: none; transition: transform .16s ease, box-shadow .16s ease; }
.cards > .panel:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.cards strong { color: var(--navy); font-size: 1.65rem; letter-spacing: -.04em; }
.cards span { color: var(--muted); }
.notice, .flash { padding: 1rem 1.1rem; margin: 1rem 0; border: 1px solid #dfe9c8; border-radius: 14px; color: #435c22; background: #f2f8e7; }
.flash { color: #234420; background: #edf8e9; border-color: #d2e9c8; }
form { display: grid; gap: .8rem; }
label { display: grid; gap: .38rem; color: var(--ink); font-size: .9rem; font-weight: 650; }
input, select, button { min-width: 0; padding: .76rem .9rem; border: 1px solid #dce2eb; border-radius: 11px; background: var(--panel); color: var(--ink); font: inherit; }
input::placeholder { color: #9ca4b3; }
input:focus, select:focus { outline: 3px solid rgb(184 235 85 / 34%); border-color: #91b34f; }
button { border: 0; color: var(--navy); background: var(--accent); font-weight: 760; cursor: pointer; transition: transform .14s ease, background .14s ease, box-shadow .14s ease; }
button:hover { background: var(--accent-strong); box-shadow: 0 5px 14px rgb(111 143 40 / 18%); transform: translateY(-1px); }
button:active { transform: translateY(0); }
button:disabled { opacity: .52; cursor: not-allowed; transform: none; box-shadow: none; }
.secondary { padding: .58rem .8rem; color: var(--navy); background: #edf1f6; }
.secondary:hover { background: #e2e8f0; }
.danger { color: #fff; background: #bd5555; }
.danger:hover { background: #a84444; }
.gridform { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); align-items: end; }
.inline { display: flex; align-items: end; flex-wrap: wrap; gap: .65rem; }
.search { display: flex; flex-direction: row; align-items: center; gap: .6rem; padding: .55rem; margin: 1.3rem 0 1.5rem; border: 1px solid #dfe4ec; border-radius: 16px; background: var(--panel); box-shadow: var(--shadow-small); }
.search input { flex: 1 1 280px; border: 0; box-shadow: none; background: transparent; padding: .9rem 1rem; font-size: 1rem; }
.search input:focus { outline: 0; }
.search label { flex: 0 1 165px; min-width: 130px; font-size: .76rem; }
.search label select { padding: .66rem .72rem; }
.search button { min-width: 118px; padding: .85rem 1.3rem; }
.product-list { display: grid; gap: .8rem; }
.product-list > .panel { display: flex; align-items: center; justify-content: space-between; gap: 1.1rem; margin: 0; }
.product-list > .panel h2 { margin: 0 0 .35rem; }
.product-actions { display: flex; flex-direction: column; align-items: end; gap: .55rem; }
.product-actions form { display: flex; align-items: center; gap: .5rem; }
.product-actions select { max-width: 190px; }
.offer-card { align-items: center; gap: 1.25rem; transition: box-shadow .16s ease, transform .16s ease; }
.offer-card:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.offer-card > div:first-child { flex: 1; min-width: 0; }
.offer-card p { margin: .35rem 0; }
.offer-card small { display: inline-block; margin-top: .2rem; }
.offer-card .pricebox { padding-left: 1.2rem; border-left: 1px solid var(--border); }
.offer-card form { margin-top: .55rem; }
.pricebox { display: grid; min-width: 205px; gap: .28rem; text-align: right; }
.pricebox b { color: var(--navy); font-size: 1.5rem; letter-spacing: -.04em; }
.pricebox span, .pricebox strong { font-size: .88rem; }
.pricebox a { color: #637e2c; font-size: .87rem; font-weight: 700; }
.muted, small { color: var(--muted); }
.compare-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; }
.compare-grid > div { padding: 1rem; border: 1px solid var(--border); border-radius: 14px; background: var(--soft); }
.tag { display: inline-flex; align-items: center; gap: .3rem; padding: .35rem .75rem; border: 1px solid var(--border); border-radius: 99px; background: var(--soft); }
.tag form { display: inline; }
.tag button { padding: 0 .25rem; background: transparent; }
.row { display: flex; align-items: center; justify-content: space-between; gap: .8rem; }
.item { padding: .65rem 0; border-bottom: 1px solid var(--border); }
.item:last-child { border: 0; }
.item form { margin: 0; }
.admin-user { padding: .9rem 0; border-bottom: 1px solid var(--border); }
.wraprow { justify-content: flex-start; flex-wrap: wrap; }
.check { display: flex; align-items: center; gap: .5rem; }
.check input { width: 1rem; height: 1rem; }
.stale { color: #ae4747; }
.fresh { color: #5d8123; }
.history-list { display: grid; gap: .45rem; }
.history-list > div { display: grid; grid-template-columns: minmax(120px, 1fr) 100px minmax(120px, 1fr); gap: .7rem; padding: .65rem 0; border-top: 1px solid var(--border); }
.history-list time, .history-list span { color: var(--muted); }
footer { max-width: 1240px; padding: 1.2rem 1.5rem 1.8rem; margin: auto; display: flex; justify-content: space-between; gap: 1rem; color: var(--muted); font-size: .82rem; }
.footer-mark { display: inline-flex; align-items: center; gap: .4rem; color: var(--navy); font-weight: 750; }
.footer-mark img { width: 21px; height: 21px; }

@media (max-width: 780px) {
  .top-inner { align-items: flex-start; flex-direction: column; gap: .8rem; padding: .75rem 1rem; }
  nav { width: 100%; gap: .2rem; }
  .nav-link { padding: .48rem .65rem; font-size: .85rem; }
  nav form { margin-left: auto; }
  .wrap { padding: 1.5rem 1rem 3rem; }
}
@media (max-width: 620px) {
  .product-list > .panel, .row { align-items: flex-start; flex-direction: column; }
  .product-actions { align-items: flex-start; width: 100%; }
  .compare-grid { grid-template-columns: 1fr; }
  .offer-card .pricebox { width: 100%; padding: .8rem 0 0; border-left: 0; border-top: 1px solid var(--border); text-align: left; }
  .pricebox { min-width: 0; text-align: left; }
  .inline { align-items: stretch; }
  .search { align-items: stretch; flex-direction: column; }
  .search input { width: 100%; flex: 0 1 auto; }
  .search label { width: 100%; flex: 0 1 auto; }
  .search button { width: 100%; }
  .history-list > div { grid-template-columns: 1fr auto; }
  .history-list span { grid-column: 1 / -1; }
  footer { flex-direction: column; padding-inline: 1rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111722;
    --panel: #1a2434;
    --ink: #edf1f7;
    --muted: #a8b1c0;
    --navy: #e1e9fa;
    --border: #303c50;
    --soft: #202c40;
    --shadow: 0 12px 36px rgb(0 0 0 / 20%);
    --shadow-small: 0 5px 18px rgb(0 0 0 / 16%);
  }
  .top { background: rgb(20 28 41 / 94%); }
  .brand-copy strong span { color: #d6ff79; }
  .nav-link { color: #b1bdd0; }
  .nav-link.active { color: #e9f6c9; background: #344329; }
  .logout { color: #b1bdd0; }
  .notice { color: #d7ebb3; background: #28351e; border-color: #485d31; }
  .flash { color: #d4f0c6; background: #24371f; border-color: #3b5b30; }
  input, select { border-color: var(--border); }
  .search { border-color: var(--border); }
  .secondary { color: var(--ink); background: #344156; }
  .secondary:hover { background: #40506a; }
  .offer-card .pricebox { border-color: var(--border); }
  .tag { background: var(--soft); }
  .fresh { color: #c8eb82; }
  .stale { color: #ff9999; }
}