/* =====================================================================
   OptimalCutting.com — site styles
   Theme tokens: [data-theme="dark"] (default) and [data-theme="light"],
   set on <html> by js/theme-init.js and toggled by js/site.js.
   ===================================================================== */

:root,
:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0b1220;
    --bg-2: #0f1728;
    --bg-glow: rgba(74, 144, 226, 0.10);
    --surface: rgba(255, 255, 255, .03);
    --surface-2: rgba(255, 255, 255, .05);
    --surface-hover: rgba(255, 255, 255, .08);
    --panel: linear-gradient(180deg, #0b1220 0%, #0f1728 100%);
    --border: rgba(255, 255, 255, .08);
    --border-strong: rgba(255, 255, 255, .14);
    --text: #e8edf5;
    --text-strong: #f7fbff;
    --muted: #aeb8c8;
    --muted-2: #9cabbe;
    --input-bg: rgba(7, 13, 24, .90);
    --input-bg-focus: rgba(10, 16, 28, .98);
    --input-text: #ecf2ff;
    --option-bg: #0f1728;
    --primary: #2991ff;
    --primary-2: #0f74db;
    --primary-text: #69b1ff;
    --focus-ring: rgba(83, 163, 255, .22);
    --link: #69b1ff;
    --amber: #ffc34d;
    --amber-bg: linear-gradient(90deg, rgba(255,183,77,.16), rgba(255,183,77,.04));
    --amber-border: rgba(255, 183, 77, .32);
    --amber-text: #ffe3b8;
    --amber-strong: #fff4dc;
    --danger-bg: rgba(255, 82, 82, .08);
    --danger-bg-hover: rgba(255, 82, 82, .14);
    --danger-text: #ffb3b3;
    --danger-border: rgba(255, 120, 120, .22);
    --err-bg: rgba(185, 28, 28, .16);
    --err-text: #ffd4d4;
    --warn-bg: rgba(161, 98, 7, .18);
    --warn-text: #ffe6a7;
    --warn-border: rgba(250, 204, 21, .20);
    --ok-bg: rgba(22, 163, 74, .14);
    --ok-text: #c9f7d8;
    --ok-border: rgba(74, 222, 128, .28);
    --sheet-h-bg: rgba(78, 161, 255, .09);
    --sheet-h-border: rgba(78, 161, 255, .22);
    --svg-wrap: linear-gradient(180deg, rgba(0,0,0,.28), rgba(0,0,0,.16));
    --shadow: 0 18px 40px rgba(0, 0, 0, .28);
    --topbar-bg: rgba(11, 18, 32, .86);
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg: #f4f6fa;
    --bg-2: #eaeef5;
    --bg-glow: rgba(41, 145, 255, 0.08);
    --surface: #ffffff;
    --surface-2: #f6f8fc;
    --surface-hover: #eef3fa;
    --panel: linear-gradient(180deg, #ffffff 0%, #f8fafd 100%);
    --border: #dde3ec;
    --border-strong: #c9d2df;
    --text: #1f2a3b;
    --text-strong: #0d1726;
    --muted: #556275;
    --muted-2: #5f6c80;
    --input-bg: #ffffff;
    --input-bg-focus: #ffffff;
    --input-text: #142033;
    --option-bg: #ffffff;
    --primary: #1a7fe8;
    --primary-2: #0b63c1;
    --primary-text: #0b63c1;
    --focus-ring: rgba(26, 127, 232, .20);
    --link: #0b63c1;
    --amber: #c07a00;
    --amber-bg: linear-gradient(90deg, #fff4dc, #fffaf0);
    --amber-border: #f2cf86;
    --amber-text: #6b4a00;
    --amber-strong: #4a3300;
    --danger-bg: #fff1f1;
    --danger-bg-hover: #ffe3e3;
    --danger-text: #b42318;
    --danger-border: #f5c2c2;
    --err-bg: #fdecec;
    --err-text: #8a1c1c;
    --warn-bg: #fff7e0;
    --warn-text: #6b4a00;
    --warn-border: #f2d78a;
    --ok-bg: #eafaf0;
    --ok-text: #14532d;
    --ok-border: #a7e3bd;
    --sheet-h-bg: #eef5ff;
    --sheet-h-border: #c7dcf7;
    --svg-wrap: #f1ece0;
    --shadow: 0 10px 30px rgba(20, 35, 60, .08);
    --topbar-bg: rgba(255, 255, 255, .88);
}

/* ---------------------------------------------------------------- base */
*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    background:
        radial-gradient(circle at top right, var(--bg-glow), transparent 35%),
        var(--bg);
    transition: background-color .2s ease, color .2s ease;
}

a { color: var(--link); }
a:hover { text-decoration: underline; }
h1:focus { outline: none; }
code, .co-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

/* ---------------------------------------------------------------- shell */
.oc-shell { min-height: 100vh; display: flex; flex-direction: column; }

.oc-topbar {
    position: sticky; top: 0; z-index: 20;
    display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap;
    padding: .7rem 1.5rem;
    background: var(--topbar-bg);
    backdrop-filter: saturate(140%) blur(8px);
    border-bottom: 1px solid var(--border);
}

.oc-brand { display: flex; align-items: center; gap: .6rem; text-decoration: none !important; color: var(--text-strong); }
.oc-brand-mark { display: block; }
.oc-brand-stack { display: flex; flex-direction: column; line-height: 1.1; }
.oc-brand-text { font-weight: 800; font-size: 1.15rem; letter-spacing: .2px; }
.oc-brand-by { font-size: .74rem; font-weight: 600; color: var(--muted-2); letter-spacing: .06em; margin-top: .12rem; }
.oc-brand-tld { color: var(--amber); }
.oc-brand-tagline { color: var(--muted-2); font-size: .82rem; margin-left: .35rem; padding-left: .7rem; border-left: 1px solid var(--border-strong); }

/* Linear | Sheet segmented selector */
.oc-mode {
    display: inline-flex; padding: 3px; gap: 2px; border-radius: 12px;
    background: var(--surface-2); border: 1px solid var(--border-strong);
}
.oc-mode-opt {
    display: inline-flex; align-items: center; gap: .4rem;
    padding: .38rem .85rem; border-radius: 9px; font-weight: 700; font-size: .9rem;
    color: var(--muted); text-decoration: none !important;
}
.oc-mode-opt:hover { color: var(--text-strong); background: var(--surface-hover); }
.oc-mode-opt.active { color: #fff; background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%); box-shadow: 0 2px 8px rgba(15,116,219,.35); }

/* ---------------------------------------------------------------- left navigation pane (MyIncomeModel layout)
   A separate panel in the left margin, pinned under the top bar while the content scrolls. It is exactly
   one viewport tall (minus the top bar) rather than as tall as the page - a sticky element as tall as its
   container has no room to stick. --oc-topbar-h is measured by js/site.js because the bar wraps on phones. */
:root { --oc-topbar-h: 62px; --oc-sidenav-w: 220px; }
.oc-body { flex: 1; display: flex; align-items: flex-start; width: 100%; }
.oc-sidenav {
    width: var(--oc-sidenav-w); flex: 0 0 var(--oc-sidenav-w);
    position: sticky; top: var(--oc-topbar-h); align-self: flex-start;
    height: calc(100vh - var(--oc-topbar-h)); overflow-y: auto;
    padding: 1rem .75rem; background: var(--bg-2); border-right: 1px solid var(--border-strong);
    z-index: 15;
}
.oc-nav { display: flex; flex-direction: column; gap: 2px; }
.oc-nav-head {
    margin: .25rem .85rem .45rem; font-size: .72rem; font-weight: 800; letter-spacing: .08em;
    text-transform: uppercase; color: var(--muted-2);
}
.oc-nav-link {
    display: flex; align-items: center; gap: .65rem;
    padding: .6rem .85rem; border-radius: 9px;
    color: var(--text); text-decoration: none !important; font-weight: 600; font-size: .94rem;
    transition: background .14s ease, color .14s ease;
}
.oc-nav-link svg { flex: none; opacity: .8; }
.oc-nav-link:hover { background: var(--surface-hover); color: var(--text-strong); }
.oc-nav-link.active {
    color: #fff; background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%);
    box-shadow: 0 2px 8px rgba(15,116,219,.30);
}
.oc-nav-link.active svg { opacity: 1; }

/* Menu button in the top bar: hidden on desktop (the pane is always visible), opens the drawer on phones. */
.oc-nav-toggle {
    display: none; align-items: center; justify-content: center; flex: none;
    width: 40px; height: 40px; border-radius: 10px; cursor: pointer;
    background: var(--surface-2); border: 1px solid var(--border-strong); color: var(--text-strong);
}
.oc-nav-toggle:hover { background: var(--surface-hover); }
.oc-nav-toggle:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--focus-ring); }
.oc-nav-toggle .oc-ico-close { display: none; }
.oc-nav-toggle[aria-expanded="true"] .oc-ico-open { display: none; }
.oc-nav-toggle[aria-expanded="true"] .oc-ico-close { display: inline; }

.oc-topbar-right { margin-left: auto; display: flex; align-items: center; gap: .55rem; }
.oc-inline-form { margin: 0; }

.oc-tier {
    display: inline-block; padding: .18rem .6rem; border-radius: 999px; font-size: .78rem; font-weight: 700;
    letter-spacing: .03em; text-transform: uppercase; text-decoration: none !important; border: 1px solid var(--border-strong);
    color: var(--muted);
}
.oc-tier--registered { color: var(--primary-text); border-color: var(--sheet-h-border); background: var(--sheet-h-bg); }
.oc-tier--subscriber { color: #3a2600; background: linear-gradient(180deg, #ffd66b, #f4b73a); border-color: #e3a52a; }

.oc-theme-toggle {
    display: inline-flex; align-items: center; gap: .4rem;
    padding: .38rem .6rem; border-radius: 999px; cursor: pointer;
    background: var(--surface-2); color: var(--text); border: 1px solid var(--border-strong);
    font: inherit; font-size: .82rem; font-weight: 600;
}
.oc-theme-toggle:hover { background: var(--surface-hover); }
.oc-theme-toggle:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--focus-ring); }
:root[data-theme="dark"] .oc-icon-sun { display: none; }
:root[data-theme="light"] .oc-icon-moon { display: none; }
.oc-icon-sun { color: #c07a00; }
.oc-icon-moon { color: #9cc9ff; }

.oc-main { flex: 1; min-width: 0; width: 100%; max-width: 1320px; margin: 0 auto; padding: 1.5rem 1.25rem 2.5rem; }

.oc-footer {
    display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem;
    padding: 1.1rem 1.5rem; border-top: 1px solid var(--border); color: var(--muted-2); font-size: .85rem;
}
.oc-footer-links { display: flex; gap: 1rem; }
.oc-footer-links a { color: var(--muted); }

/* ---------------------------------------------------------------- generic page bits */
.oc-page { max-width: 1100px; margin: 0 auto; }
.oc-hero-single { max-width: 720px; padding: 2rem 0; }
.oc-kicker { color: var(--amber); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; margin-bottom: .35rem; }
.oc-title { margin: 0 0 .5rem; font-size: 2rem; line-height: 1.15; color: var(--text-strong); }
.oc-subtitle { color: var(--muted); line-height: 1.55; max-width: 760px; margin: 0 0 1.25rem; }
.oc-actions { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }
.oc-prose { max-width: 780px; line-height: 1.65; }
.oc-prose h2 { font-size: 1.15rem; margin: 1.6rem 0 .4rem; color: var(--text-strong); }
.oc-prose p { color: var(--text); }

.oc-ok, .co-err, .co-warn { padding: .8rem .95rem; border-radius: 12px; margin-bottom: 1rem; border: 1px solid; }
.oc-ok { background: var(--ok-bg); color: var(--ok-text); border-color: var(--ok-border); }

/* buttons (oc-* and co-* share the same look) */
.oc-btn, .co-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .35rem;
    padding: .62rem .95rem; border-radius: 10px; cursor: pointer;
    font: inherit; font-size: .94rem; font-weight: 600; line-height: 1.2;
    border: 1px solid transparent; text-decoration: none !important;
    transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.oc-btn:hover, .co-btn:hover { transform: translateY(-1px); }
.oc-btn:focus-visible, .co-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--focus-ring); }
.oc-btn-primary, .co-btn-primary { background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%); color: #fff !important; border-color: rgba(78,161,255,.45); }
.oc-btn-primary:hover, .co-btn-primary:hover { filter: brightness(1.07); }
.oc-btn-sec, .co-btn-sec { background: var(--surface-2); color: var(--text-strong) !important; border-color: var(--border-strong); }
.oc-btn-sec:hover, .co-btn-sec:hover { background: var(--surface-hover); }
.oc-btn-danger, .co-btn-danger { background: var(--danger-bg); color: var(--danger-text) !important; border-color: var(--danger-border); }
.co-btn-danger { padding: .45rem .75rem; }
.oc-btn-danger:hover, .co-btn-danger:hover { background: var(--danger-bg-hover); }
.oc-btn-sm, .co-btn-sm { padding: .35rem .7rem; font-size: .85rem; }
.oc-btn-block { width: 100%; }
.oc-btn-static { cursor: default; }
.oc-btn-static:hover { transform: none; }
.co-btn:disabled, .co-btn[disabled], .oc-btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }

/* ---------------------------------------------------------------- forms (auth / account) */
.oc-auth { max-width: 460px; }
.oc-form { display: flex; flex-direction: column; gap: .35rem; }
.oc-form .co-label { margin-top: .6rem; margin-bottom: .2rem; }
.oc-form button[type=submit] { margin-top: 1rem; }
.oc-form-foot { margin-top: .8rem; font-size: .9rem; }
.validation-message { color: var(--danger-text); font-size: .85rem; }
.invalid { outline: 1px solid var(--danger-text); }

/* ---------------------------------------------------------------- pricing */
.oc-plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; margin: 1rem 0 2rem; }
.oc-plan {
    position: relative; display: flex; flex-direction: column;
    padding: 1.4rem; border-radius: 16px; background: var(--panel); border: 1px solid var(--border); box-shadow: var(--shadow);
}
.oc-plan--featured { border-color: var(--amber-border); box-shadow: 0 0 0 1px var(--amber-border), var(--shadow); }
.oc-plan--current { outline: 2px solid var(--primary); outline-offset: -2px; }
.oc-plan-ribbon { position: absolute; top: -11px; right: 16px; padding: .15rem .6rem; border-radius: 999px; font-size: .75rem; font-weight: 800; color: #3a2600; background: linear-gradient(180deg, #ffd66b, #f4b73a); }
.oc-plan-name { margin: 0; font-size: 1.15rem; color: var(--text-strong); }
.oc-plan-price { font-size: 2rem; font-weight: 800; color: var(--primary-text); margin: .35rem 0; }
.oc-plan-blurb { color: var(--muted); min-height: 3em; margin: 0 0 .75rem; }
.oc-plan-features { list-style: none; padding: 0; margin: 0 0 1.2rem; display: grid; gap: .45rem; flex: 1; }
.oc-plan-features li::before { content: "✓"; color: #34c37a; font-weight: 800; margin-right: .5rem; }
.oc-plan-features li.oc-plan-group { margin-top: .35rem; font-size: .74rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: var(--muted-2); }
.oc-plan-features li.oc-plan-group::before { content: none; }
.oc-plan-features li.oc-off { color: var(--muted-2); text-decoration: line-through; opacity: .7; }
.oc-plan-features li.oc-off::before { content: "–"; color: var(--muted-2); }
.oc-plan-cta form { margin: 0; }
.oc-plan-note { margin-top: .5rem; font-size: .85rem; color: var(--muted); text-align: center; }
.oc-faq dt { font-weight: 700; color: var(--text-strong); margin-top: 1rem; }
.oc-faq dd { margin: .25rem 0 0; color: var(--muted); }

/* ---------------------------------------------------------------- account */
.oc-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1rem; }
.oc-card { padding: 1.25rem; border-radius: 16px; background: var(--panel); border: 1px solid var(--border); box-shadow: var(--shadow); }
.oc-card h2 { margin: 0 0 .8rem; font-size: 1.05rem; color: var(--text-strong); }
.oc-kv { list-style: none; padding: 0; margin: 0 0 1rem; display: grid; gap: .45rem; }
.oc-kv li { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px dashed var(--border); padding-bottom: .35rem; }
.oc-kv li span { color: var(--muted); }
.oc-plan-now { margin: 0 0 .8rem; }
.oc-danger-zone { margin-top: .5rem; border: 1px solid var(--danger-border); border-radius: 10px; padding: .6rem .8rem; }
.oc-danger-zone summary { cursor: pointer; color: var(--danger-text); font-weight: 600; }

/* =====================================================================
   Optimizer (co-*)
   ===================================================================== */
.co-page {
    color: var(--text);
    background: radial-gradient(circle at top right, var(--bg-glow), transparent 30%), var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 2.2rem;
    box-shadow: var(--shadow);
}
.co-title { margin: 0 0 .4rem; font-size: 2rem; line-height: 1.1; color: var(--text-strong); }
.co-intro { margin: 0 0 1.2rem; color: var(--muted); max-width: 980px; line-height: 1.5; }

.co-freebanner {
    display: flex; gap: .85rem; align-items: center;
    padding: .75rem 1rem; border-radius: 14px; margin-bottom: 1rem;
    background: var(--amber-bg); border: 1px solid var(--amber-border); color: var(--amber-text);
}
.co-freebanner-icon { font-size: 1.3rem; line-height: 1; color: var(--amber); }
.co-freebanner-body { flex: 1; line-height: 1.5; font-size: .95rem; }
.co-freebanner-body b { color: var(--amber-strong); }
.co-freebanner-upgrade { color: var(--amber-strong) !important; font-weight: 700; }
.co-freebanner-pill {
    display: inline-block; padding: .1rem .55rem; border-radius: 999px; margin-right: .3rem;
    background: rgba(255,195,77,.25); color: var(--amber-strong); font-weight: 800; font-size: .78rem; letter-spacing: .03em;
}
.co-limit-note { font-size: .85rem; color: var(--amber-text); margin-left: .6rem; }
.co-limit-note a { color: var(--amber-strong); font-weight: 700; }

.co-section { margin-bottom: 1rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); overflow: hidden; }
.co-section-h {
    padding: .8rem 1rem; font-weight: 700; color: var(--text-strong);
    background: var(--surface-2); border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between; gap: .75rem; flex-wrap: wrap;
}
.co-section-h-count { font-weight: 500; font-size: .85rem; color: var(--muted-2); }
.co-section-b { padding: 1rem; }

.co-row { display: flex; flex-wrap: wrap; gap: 1rem; }
.co-col { flex: 1 1 260px; min-width: 240px; }
.co-inline { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.co-inline .co-inp, .co-inline .co-select { flex: 1 1 180px; width: auto; }
.co-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; margin-top: .6rem; }
.co-grid2 label { display: flex; flex-direction: column; gap: .2rem; }

.co-label { display: block; margin-bottom: .45rem; font-weight: 600; color: var(--text-strong); }

.co-inp, .co-select {
    width: 100%; padding: .55rem .7rem; border-radius: 10px;
    border: 1px solid var(--border-strong); background: var(--input-bg); color: var(--input-text);
    font-family: inherit; font-size: .95rem; outline: none;
    transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.co-inp:focus, .co-select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); background: var(--input-bg-focus); }
/* Native dropdown lists ignore inherited colours on Windows — style options explicitly. */
.co-select option { background-color: var(--option-bg); color: var(--input-text); }

.co-check { display: inline-flex; align-items: center; gap: .55rem; margin-top: .35rem; color: var(--text); }
.co-check input { accent-color: var(--primary); }

.co-help { font-size: .83rem; color: var(--muted-2); margin-top: .45rem; line-height: 1.45; }
.co-help-strong { color: var(--text); }
.co-mono { color: var(--text-strong); }

.co-actions { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; margin-top: .8rem; }
.co-actions-main { margin-bottom: 1rem; }

.co-spinner {
    width: 18px; height: 18px; border-radius: 50%;
    border: 2px solid var(--border-strong); border-top-color: var(--primary);
    animation: co-spin .8s linear infinite;
}
@keyframes co-spin { to { transform: rotate(360deg); } }

.co-table-wrap { width: 100%; overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.co-tbl { width: 100%; border-collapse: collapse; min-width: 760px; }
.co-tbl th, .co-tbl td { padding: .55rem .65rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; font-size: .93rem; }
.co-tbl th { background: var(--surface-2); color: var(--text-strong); font-weight: 700; }
.co-tbl td { color: var(--text); }
.co-tbl tbody tr:hover td { background: var(--surface-hover); }
.co-center { text-align: center !important; }
.co-narrow { width: 120px; }
.co-narrower { width: 80px; }
.co-rot { width: 150px; }

.co-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: .8rem; }
.co-stat { padding: .9rem; border-radius: 14px; background: var(--surface-2); border: 1px solid var(--border); }
.co-stat-v { display: block; font-size: 1.25rem; font-weight: 800; color: var(--primary-text); margin-bottom: .2rem; }
.co-stat-l { font-size: .8rem; color: var(--muted-2); text-transform: uppercase; letter-spacing: .04em; }

.co-err { color: var(--err-text); background: var(--err-bg); border-color: var(--danger-border); }
.co-warn { color: var(--warn-text); background: var(--warn-bg); border-color: var(--warn-border); margin-top: 1rem; }

.co-sheet-h {
    margin: 1rem 0 .55rem; padding: .65rem .8rem;
    background: var(--sheet-h-bg); border: 1px solid var(--sheet-h-border); border-left: 4px solid var(--primary);
    border-radius: 12px; color: var(--text-strong); font-weight: 700;
}
.co-sheet-h--danger { background: var(--err-bg); border-color: var(--danger-border); border-left-color: #ff7f7f; }

.co-sheet-viz { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-start; margin-bottom: 1rem; }
.co-sheet-svg-wrap { flex: 0 1 auto; max-width: 100%; background: var(--svg-wrap); padding: .75rem; border-radius: 12px; border: 1px solid var(--border); }
.oc-svg { display: block; max-width: 100%; height: auto; border-radius: 6px; }
.co-sheet-table { flex: 1 1 360px; min-width: 300px; }
.co-sheet-table .co-tbl { min-width: 0; }

.co-swatch {
    display: inline-block; width: 14px; height: 14px; border-radius: 3px; border: 1px solid;
    vertical-align: middle; margin-right: .45rem; box-shadow: 0 0 0 1px rgba(0,0,0,.2) inset;
}

.co-advanced-col { flex-basis: 100%; }
.co-advanced { border: 1px solid var(--border); border-radius: 10px; padding: .55rem .7rem; background: var(--surface); }
.co-advanced[open] { background: var(--surface-2); }
.co-advanced > summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: .75rem; padding: .15rem .1rem; user-select: none; flex-wrap: wrap; }
.co-advanced > summary::-webkit-details-marker { display: none; }
.co-advanced > summary::before { content: '▸'; display: inline-block; color: var(--muted-2); font-size: .8rem; margin-right: .5rem; transition: transform .15s ease; }
.co-advanced[open] > summary::before { transform: rotate(90deg); }
.co-adv-label { font-weight: 600; color: var(--text-strong); flex: 1; }
.co-adv-hint { font-size: .82rem; color: var(--muted-2); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

/* ---------------------------------------------------------------- linear optimizer */
.co-lin-grid { display: grid; grid-template-columns: 1fr 1fr minmax(280px, .9fr); gap: 1rem; align-items: start; }
.co-lin-grid > .co-section { margin-bottom: 0; }
.co-lin-grid + * { margin-top: 1rem; }
.co-textarea { min-height: 300px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; line-height: 1.5; }
.co-help-top { margin: 0 0 .6rem; }
.co-stack { display: flex; flex-direction: column; gap: .9rem; }
.co-stack .co-actions { margin-top: 0; }
.co-file { position: relative; overflow: hidden; }
.co-file input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.co-progress-row { display: flex; justify-content: space-between; font-size: .85rem; color: var(--muted-2); margin-bottom: .35rem; }
.co-progress-track { height: 8px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.co-progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--amber)); transition: width .25s linear; }
.co-piece-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(420px, 1fr)); gap: .8rem; }
.co-piece { border: 1px solid var(--border); border-radius: 12px; padding: .75rem .85rem; background: var(--surface-2); }
.co-piece-head { display: flex; justify-content: space-between; align-items: baseline; gap: .75rem; margin-bottom: .5rem; color: var(--text-strong); }
.co-piece-waste { font-size: .82rem; font-weight: 700; color: var(--amber-text); background: var(--amber-bg); border: 1px solid var(--amber-border); border-radius: 999px; padding: .1rem .55rem; white-space: nowrap; }
.co-bar-wrap { background: var(--svg-wrap); border-radius: 8px; padding: .35rem; border: 1px solid var(--border); margin-bottom: .4rem; }
.oc-bar { display: block; width: 100%; height: auto; }

/* ---------------------------------------------------------------- Blazor error UI */
#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow; color: #222;
    bottom: 0; box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    display: none; left: 0; padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed; width: 100%; z-index: 1000;
}
#blazor-error-ui .dismiss { cursor: pointer; position: absolute; right: 0.75rem; top: 0.5rem; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 900px) {
    .co-page { padding: 1rem; }
    .co-title, .oc-title { font-size: 1.6rem; }
    .oc-brand-tagline { display: none; }
    .co-lin-grid { grid-template-columns: 1fr; }
    .co-piece-list { grid-template-columns: 1fr; }
    .oc-topbar { padding: .6rem 1rem; gap: .6rem; }
    .oc-topbar-right { margin-left: 0; width: 100%; justify-content: flex-end; flex-wrap: wrap; }
    .oc-theme-label { display: none; }
    .oc-main { padding: 1rem .75rem 2rem; }
    /* The left pane becomes a drop-down drawer under the top bar, opened by the menu button. */
    .oc-nav-toggle { display: inline-flex; }
    .oc-body { flex-direction: column; align-items: stretch; }
    .oc-sidenav {
        width: 100%; flex: 0 0 auto; height: auto; align-self: stretch; z-index: 18;
        border-right: 0; border-bottom: 0 solid var(--border-strong); box-shadow: var(--shadow);
        max-height: 0; overflow: hidden; padding-top: 0; padding-bottom: 0;
        transition: max-height .22s ease, padding .22s ease;
    }
    .oc-sidenav.open { max-height: 80vh; overflow-y: auto; padding-top: .6rem; padding-bottom: .75rem; border-bottom-width: 1px; }
    .oc-nav-link { padding: .75rem .9rem; font-size: 1rem; }
}

@media print {
    .oc-topbar, .oc-sidenav, .oc-footer, .co-actions, .co-freebanner { display: none !important; }
}

/* ---------------------------------------------------------------- passwordless sign-in / account */
.oc-code-inp { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 1.6rem; letter-spacing: .45em; text-align: center; padding: .6rem; }
.oc-inline-row { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; color: var(--muted-2); }
.oc-linkbtn { background: none; border: 0; padding: 0; font: inherit; color: var(--link); cursor: pointer; text-decoration: underline; }
.oc-card-wide { grid-column: 1 / -1; }
.oc-devices { min-width: 640px; }
.oc-devices .oc-tier { margin-left: .4rem; font-size: .7rem; }

/* ---------------------------------------------------------------- registration + subscribe (MyIncomeModel template) */
.oc-btn-gold { background: linear-gradient(180deg, #ffd66b, #f4b73a); color: #3a2600 !important; border-color: #e3a52a; }
.oc-btn-gold:hover { filter: brightness(1.05); }
.oc-toolbar { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1rem; align-items: center; }
.oc-form .oc-toolbar button[type=submit] { margin-top: 0; }
.oc-note {
    margin: .9rem 0; padding: .75rem .9rem; border-radius: 10px; font-size: .93rem; line-height: 1.55;
    background: var(--surface-2); border: 1px solid var(--border); border-left: 3px solid var(--primary); color: var(--text);
}
.oc-note code, .oc-note .co-mono { font-size: .85em; }
.oc-lead { font-size: 1.12rem; font-weight: 600; color: var(--text-strong); margin: 0 0 .6rem; }

/* Registration: single readable column with the featured account card */
.oc-reg-single { max-width: 680px; display: grid; gap: 1rem; }
.oc-account { border-top: 3px solid var(--amber); background: var(--amber-bg), var(--panel); }
.oc-acct-head { display: flex; align-items: center; gap: .85rem; flex-wrap: wrap; }
.oc-avatar {
    flex: none; width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center;
    font-weight: 800; font-size: 1.2rem; color: #fff; background: linear-gradient(180deg, var(--primary), var(--primary-2));
}
.oc-acct-text { flex: 1; min-width: 180px; }
.oc-acct-text h2 { margin: 0; font-size: 1.1rem; color: var(--text-strong); }
.oc-who { margin: .15rem 0 0; color: var(--muted); font-size: .9rem; overflow-wrap: anywhere; }
.oc-account .oc-tier { flex: none; }
.oc-acct-settings { margin-top: 0; }
.oc-account .oc-danger-zone { margin-top: 1rem; }
.oc-account .oc-danger-zone form { margin: .5rem 0 0; }

/* Subscribe: tier cards (reuse .oc-plan) + details card */
ul.oc-plans { list-style: none; padding: 0; }
.oc-plan-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.oc-you-tag {
    padding: .15rem .55rem; border-radius: 999px; font-size: .72rem; font-weight: 800; letter-spacing: .04em; text-transform: uppercase;
    color: #fff; background: var(--primary);
}
.oc-plan-per { font-size: .9rem; font-weight: 600; color: var(--muted); }
.oc-plan-cta { margin: 0 0 1rem; }
.oc-plan-features li.oc-plus { font-weight: 700; color: var(--text-strong); }
.oc-plan-features li.oc-plus::before { content: "+"; }
.oc-sub-details { margin-bottom: 2rem; }
.oc-sub-details h3 { margin: 1.4rem 0 .4rem; font-size: 1rem; color: var(--text-strong); scroll-margin-top: 6rem; }
.oc-sub-notes { margin: .4rem 0 .6rem; padding-left: 1.2rem; color: var(--muted); display: grid; gap: .35rem; font-size: .92rem; }
.oc-agree-line { margin: 0 0 .8rem; }
.oc-paypal-wrap { max-width: 420px; padding: 1rem; border-radius: 12px; background: #fff; border: 1px solid var(--border); }
.oc-paypal-wrap .co-help { color: #556275; }
.oc-pp-or { text-align: center; color: #556275; font-size: .82rem; margin: .5rem 0; }
.oc-card-logos { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; margin-top: .6rem; }
.oc-card-logos img { display: block; border-radius: 4px; }
.oc-card-logos-lbl { color: #556275; font-size: .8rem; }
.oc-cancel-confirm { border-left-color: var(--danger-text); }
.oc-comp-badge {
    display: inline-block; padding: .18rem .6rem; border-radius: 999px; font-size: .72rem; font-weight: 800; letter-spacing: .04em;
    text-transform: uppercase; color: #fff; background: #b45309; border: 1px solid #92400e; white-space: nowrap;
}
.oc-thanks { max-width: 760px; }
.oc-tier-grid .oc-plan-features { align-content: start; }
.oc-acct-settings { grid-template-columns: 1fr; }
.oc-account .oc-form { margin-top: .9rem; }

/* ---------------------------------------------------------------- left pane separator + contact page */
.oc-nav-gap { height: 1px; border-top: 1px solid var(--border-strong); margin: .75rem .6rem; }
.oc-contact-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 1rem; align-items: start; }
.oc-contact-msg { min-height: 160px; resize: vertical; line-height: 1.5; font-family: inherit; }
.oc-contact-captcha { max-width: 140px; }
.oc-contact-status { margin-top: 1rem; }
.oc-contact-meta { display: grid; gap: .6rem; margin-top: .8rem; }
.oc-contact-row {
    display: flex; flex-direction: column; gap: 2px;
    padding: .65rem .8rem; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--border);
}
.oc-contact-row .k { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted-2); font-weight: 700; }
.oc-contact-row .v { color: var(--text-strong); overflow-wrap: anywhere; }
.oc-contact-fine { margin-top: 1rem; }
@media (max-width: 900px) { .oc-contact-grid { grid-template-columns: 1fr; } }

/* Optimizers section at the top of the left pane (Linear / Sheet, moved from the header) */
.oc-nav-opt { padding-top: .5rem; padding-bottom: .5rem; }
.oc-nav-text { display: flex; flex-direction: column; line-height: 1.15; }
.oc-nav-text small { font-size: .74rem; font-weight: 500; color: var(--muted-2); margin-top: 2px; }
.oc-nav-link.active .oc-nav-text small { color: rgba(255,255,255,.82); }

/* ---------------------------------------------------------------- informative upgrade notice (UpgradeNotice.razor) */
.oc-upgrade {
    display: flex; align-items: center; flex-wrap: wrap; gap: .5rem .75rem;
    margin: 1rem 0; padding: .8rem 1rem; border-radius: 12px;
    background: var(--amber-bg); border: 1px solid var(--amber-border); color: var(--amber-text);
}
.oc-upgrade-icon { color: var(--amber); font-size: 1.05rem; line-height: 1; }
.oc-upgrade-msg { flex: 1 1 260px; line-height: 1.45; }
.oc-upgrade-cta { flex: none; }
.oc-upgrade--compact { margin: .6rem 0 0; padding: .55rem .75rem; font-size: .88rem; }