/* =====================================================================================================
   KINGLUX - kl2/calc.css : trang «Tính toán chiếu sáng» /tinh-toan-chieu-sang (ban 020 - anh 05/11/2026 15:27) - lop kl2c-*
   Layout nap khi view dat ViewData["KlCalc"] = true (Intro.cshtml, khoa tinh-toan-chieu-sang) ; bien mau / phong : :root cua kl2/kl2.css.
   ===================================================================================================== */
.kl2c { display: block; padding-bottom: 56px; }
.kl2c h1, .kl2c h2, .kl2c h3, .kl2c p { margin: 0; }
.kl2c a { text-decoration: none; }
.kl2c :focus-visible { outline: 2px solid var(--kl-gold2); outline-offset: 2px; }
.kl2c section[id] { scroll-margin-top: 92px; }
/* ---------- dau trang ---------- */
.kl2c-hero { border-bottom: 1px solid var(--kl-line); background: radial-gradient(1200px 420px at 85% -10%, rgba(236,174,32,0.14), transparent 60%), var(--kl-bg); }
.kl2c-hero-in { display: flex; flex-direction: column; gap: 14px; padding-top: 34px; padding-bottom: 30px; }
.kl2c-crumb { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; font-size: 13px; color: var(--kl-faint); }
.kl2c-crumb li + li::before { content: "›"; margin-right: 6px; color: var(--kl-gold-dim); }
.kl2c-crumb a { color: var(--kl-muted); }
.kl2c-h1 { font-family: var(--kl-font-h); font-size: clamp(26px, 3.6vw, 42px); line-height: 1.12; font-weight: 800; color: #FFFFFF; text-wrap: balance; }
.kl2c-h1 span { color: var(--kl-gold); }
.kl2c-lead { max-width: 78ch; color: var(--kl-soft); font-size: 16px; }
.kl2c-badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.kl2c-badges li { display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px; border: 1px solid var(--kl-line2); border-radius: 999px; background: var(--kl-panel);
    color: var(--kl-soft); font-size: 13px; font-weight: 700; }
.kl2c-badges li b { color: var(--kl-gold); }
/* ---------- cong cu ---------- */
.kl2c-app { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); gap: 22px; align-items: start; padding-top: 26px; }
.kl2c-tabs { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; }
.kl2c-tab { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px; border: 1px solid #3A3A3A; border-radius: 12px; background: var(--kl-panel); color: var(--kl-text);
    font-size: 14.5px; font-weight: 800; cursor: pointer; }
.kl2c-tab[aria-selected="true"] { border-color: var(--kl-gold); background: var(--kl-gold); color: var(--kl-ink); }
.kl2c-tab svg { width: 18px; height: 18px; flex: none; }
.kl2c-pro { margin-left: auto; }
.kl2c-form { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.kl2c-box { display: flex; flex-direction: column; gap: 12px; padding: 16px 18px; border: 1px solid var(--kl-line2); border-radius: var(--kl-r-lg); background: var(--kl-panel); }
.kl2c-box-h { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 800; color: #FFFFFF; }
.kl2c-box-h i { width: 26px; height: 26px; flex: none; display: grid; place-items: center; border-radius: 50%; background: #2A2108; color: var(--kl-gold); font-style: normal; font-size: 13px; font-weight: 900; }
.kl2c-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr)); gap: 10px 12px; }
.kl2c-f { display: flex; flex-direction: column; gap: 4px; min-width: 0; margin: 0; font-size: 12.5px; font-weight: 800; letter-spacing: 0.02em; color: var(--kl-muted); }
.kl2c-f input, .kl2c-f select { width: 100%; min-width: 0; height: 44px; box-sizing: border-box; margin: 0; padding: 0 12px; border: 1px solid #3A3A3A; border-radius: 10px; background: var(--kl-bg2);
    color: var(--kl-text); font-size: 15px; font-weight: 700; color-scheme: dark; outline: none; }
.kl2c-f input:focus, .kl2c-f select:focus { border-color: var(--kl-gold); }
.kl2c-f small { font-weight: 600; letter-spacing: 0; color: var(--kl-faint); }
.kl2c-f-wide { grid-column: 1 / -1; }
.kl2c-hint { font-size: 13px; line-height: 1.45; color: var(--kl-muted); }
.kl2c-req { padding: 8px 12px; border-left: 3px solid var(--kl-gold); border-radius: 0 8px 8px 0; background: var(--kl-bg2); font-size: 13.5px; font-weight: 700; color: var(--kl-soft); }
.kl2c-seg { display: flex; flex-wrap: wrap; gap: 8px; }
.kl2c-seg label { position: relative; display: inline-flex; align-items: center; min-height: 40px; padding: 0 14px; border: 1px solid #3A3A3A; border-radius: 999px; color: var(--kl-text);
    font-size: 13.5px; font-weight: 700; cursor: pointer; }
.kl2c-seg input { position: absolute; opacity: 0; pointer-events: none; }
.kl2c-seg label:has(input:checked) { border-color: var(--kl-gold); background: var(--kl-gold-bg); color: var(--kl-gold); }
.kl2c-seg label:has(input:focus-visible) { outline: 2px solid var(--kl-gold2); outline-offset: 2px; }
.kl2c-check { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; font-size: 13.5px; font-weight: 700; color: var(--kl-soft); cursor: pointer; }
.kl2c-check input { width: 18px; height: 18px; margin: 0; accent-color: var(--kl-gold); }
.kl2c-presets { display: flex; flex-wrap: wrap; gap: 6px; }
.kl2c-presets button { min-height: 34px; padding: 0 12px; border: 1px dashed #3A3A3A; border-radius: 999px; background: transparent; color: var(--kl-soft); font-size: 12.5px; font-weight: 700; cursor: pointer; }
.kl2c-presets button:hover { border-color: var(--kl-gold); color: var(--kl-gold); }
/* chuyen sau / den Kinglux / den bat ky / tu bo tri : chi AN theo lop tren #kl2-calc (calc.js Sync ; Razor in san lop dau) - con lai giu display goc */
#kl2-calc:not(.kl2c-is-pro) .kl2c-pro-only,
#kl2-calc.kl2c-is-pro .kl2c-basic-only,
#kl2-calc:not(.kl2c-is-kl) .kl2c-kl-only,
#kl2-calc.kl2c-is-kl .kl2c-own-only,
#kl2-calc:not(.kl2c-is-manual) .kl2c-man-only,
#kl2-calc:not(.kl2c-is-custom) .kl2c-custom-only,
#kl2-calc:not(.kl2c-is-cie) .kl2c-cie-only { display: none !important; }
/* ---------- ket qua ---------- */
.kl2c-out { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 12px; min-width: 0; padding: 18px; border: 1px solid var(--kl-gold-dim); border-radius: var(--kl-r-lg);
    background: linear-gradient(180deg, #17120A 0%, var(--kl-panel) 40%); }
.kl2c-out-h { font-size: 12px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; color: var(--kl-gold); }
.kl2c-big { display: flex; align-items: baseline; gap: 10px; }
.kl2c-big b { font-family: var(--kl-font-h); font-size: clamp(40px, 5vw, 56px); line-height: 1; font-weight: 800; color: #FFFFFF; font-variant-numeric: tabular-nums; }
.kl2c-big span { font-size: 16px; font-weight: 800; color: var(--kl-soft); }
.kl2c-layout { font-size: 14px; font-weight: 700; color: var(--kl-soft); }
.kl2c-ok, .kl2c-warn { margin: 4px 0 0; padding: 8px 12px; border-radius: 10px; font-size: 13.5px; font-weight: 700; line-height: 1.4; }
.kl2c-ok { background: rgba(63,185,80,0.12); color: #8BE09A; }
.kl2c-warn { background: rgba(241,89,42,0.12); color: #FFB08A; }
.kl2c-facts { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; }
.kl2c-fact { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--kl-line); font-size: 13.5px; }
.kl2c-fact span { color: var(--kl-muted); }
.kl2c-fact b { flex: none; max-width: 62%; text-align: right; font-weight: 800; color: #FFFFFF; font-variant-numeric: tabular-nums; }
.kl2c-fact.kl2c-ok, .kl2c-fact.kl2c-bad { margin: 0; padding: 7px 0; border-radius: 0; background: none; }
.kl2c-fact.kl2c-ok b { color: #8BE09A; }
.kl2c-fact.kl2c-bad b { color: #FFB08A; }
.kl2c-planbox { position: relative; display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 8px 0 2px; overflow: hidden; }
.kl2c-planbox canvas { display: block; max-width: 100%; height: auto; border-radius: 8px; background: var(--kl-bg2); }
.kl2c-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 12px; font-size: 12px; color: var(--kl-muted); }
.kl2c-legend span { display: inline-flex; align-items: center; gap: 5px; }
.kl2c-legend i { width: 14px; height: 10px; border-radius: 2px; }
.kl2c-legend-x { flex-basis: 100%; justify-content: center; color: var(--kl-faint); }
.kl2c-acts { display: flex; flex-wrap: wrap; gap: 8px; }
.kl2c-acts .kl2-btn { flex: 1 1 140px; }
.kl2c-note { font-size: 12.5px; line-height: 1.45; color: var(--kl-faint); }
.kl2c-out-bad .kl2c-planbox, .kl2c-out-bad .kl2c-acts { display: none; }
/* ---------- phan noi dung (bang, phuong phap, hoi dap, nguon) ---------- */
.kl2c-sec { padding-top: 48px; }
.kl2c-sh { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.kl2c-sh h2 { font-family: var(--kl-font-h); font-size: clamp(20px, 2.4vw, 28px); line-height: 1.2; font-weight: 800; color: #FFFFFF; }
.kl2c-sh p { max-width: 80ch; color: var(--kl-muted); font-size: 14.5px; }
.kl2c-tablebox { overflow-x: auto; border: 1px solid var(--kl-line2); border-radius: var(--kl-r); -webkit-overflow-scrolling: touch; }
.kl2c-table { width: 100%; min-width: 640px; border-collapse: collapse; font-size: 14px; }
.kl2c-table th, .kl2c-table td { padding: 9px 12px; border-bottom: 1px solid var(--kl-line); text-align: left; vertical-align: top; }
.kl2c-table thead th { position: sticky; top: 0; background: var(--kl-panel2); color: var(--kl-gold); font-size: 12px; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }
.kl2c-table tbody th { color: #FFFFFF; font-weight: 700; }
.kl2c-table td { color: var(--kl-soft); font-variant-numeric: tabular-nums; }
.kl2c-table tr.kl2c-tg th { padding-top: 14px; background: var(--kl-bg2); color: var(--kl-gold); font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase; }
.kl2c-table td.kl2c-num { white-space: nowrap; font-weight: 800; color: #FFFFFF; }
.kl2c-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr)); gap: 14px; }
.kl2c-card { display: flex; flex-direction: column; gap: 8px; padding: 16px 18px; border: 1px solid var(--kl-line2); border-radius: var(--kl-r); background: var(--kl-panel); }
.kl2c-card h3 { font-size: 16px; font-weight: 800; color: #FFFFFF; }
.kl2c-card p, .kl2c-card li { font-size: 14px; line-height: 1.55; color: var(--kl-soft); }
.kl2c-card ul { margin: 0; padding-left: 18px; }
.kl2c-formula { display: block; padding: 10px 12px; border-radius: 10px; background: var(--kl-bg2); color: var(--kl-gold2); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 14px; line-height: 1.5; overflow-x: auto; white-space: nowrap; }
.kl2c-faq { display: flex; flex-direction: column; gap: 8px; }
.kl2c-faq details { border: 1px solid var(--kl-line2); border-radius: var(--kl-r); background: var(--kl-panel); }
.kl2c-faq summary { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 48px; padding: 10px 16px; font-size: 15px; font-weight: 800; color: #FFFFFF;
    cursor: pointer; list-style: none; }
.kl2c-faq summary::-webkit-details-marker { display: none; }
.kl2c-faq summary::after { content: "+"; flex: none; font-size: 20px; color: var(--kl-gold); }
.kl2c-faq details[open] summary::after { content: "−"; }
.kl2c-faq details > div { padding: 0 16px 14px; font-size: 14.5px; line-height: 1.6; color: var(--kl-soft); }
.kl2c-src { margin: 0; padding-left: 20px; font-size: 13.5px; line-height: 1.6; color: var(--kl-muted); }
.kl2c-src li + li { margin-top: 4px; }
.kl2c-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; margin-top: 40px; padding: 18px 22px; border: 1px solid #3A2E0F;
    border-radius: var(--kl-r-lg); background: linear-gradient(110deg, #17120A 0%, var(--kl-panel) 60%); }
.kl2c-cta strong { display: block; font-size: 17px; color: #FFFFFF; }
.kl2c-cta span { color: var(--kl-muted); font-size: 14px; }
.kl2c-cta-acts { display: flex; flex-wrap: wrap; gap: 10px; }
/* thanh tom tat ket qua (dien thoai / may tinh bang doc : ket qua nam duoi cac o nhap) - bam de xuong phan ket qua */
.kl2c-mini { display: none; }
/* ---------- may tinh bang / dien thoai ---------- */
@media (max-width: 1023.98px) {
    .kl2c-app { grid-template-columns: minmax(0, 1fr); }
    .kl2c-out { position: static; }
    .kl2c .kl2c-mini { position: sticky; bottom: calc(66px + env(safe-area-inset-bottom, 0px)); z-index: 5; display: flex; align-items: center; gap: 10px; min-height: 48px;
        padding: 6px 14px; border: 1px solid var(--kl-gold); border-radius: 14px; background: rgba(23,18,10,0.97); color: var(--kl-text); box-shadow: 0 8px 24px rgba(0,0,0,0.6); }
    .kl2c-mini b { font-family: var(--kl-font-h); font-size: 24px; font-weight: 800; color: #FFFFFF; }
    .kl2c-mini span { flex: 1 1 auto; min-width: 0; font-size: 13.5px; font-weight: 700; color: #8BE09A; }
    .kl2c-mini.kl2c-mini-bad span { color: #FFB08A; }
    .kl2c-mini em { flex: none; font-style: normal; font-size: 13px; font-weight: 800; color: var(--kl-gold); }
    .kl2c-mini[hidden] { display: none !important; }
}
@media (max-width: 640px) {
    .kl2c-hero-in { padding-top: 22px; padding-bottom: 20px; }
    .kl2c-lead { font-size: 15px; }
    .kl2c-box { padding: 14px; }
    .kl2c-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .kl2c-pro { margin-left: 0; }
    .kl2c-tab { flex: 1 1 auto; justify-content: center; }
    .kl2c-fact { flex-direction: column; align-items: flex-start; gap: 2px; }
    .kl2c-fact b { max-width: none; text-align: left; }
    .kl2c-cta { padding: 16px; }
    .kl2c-cta-acts .kl2-btn { flex: 1 1 100%; }
}
/* ---------- in / luu PDF : chi cong cu + ket qua ---------- */
@media print {
    body.kl2 { background: #FFFFFF !important; color: #000000 !important; }
    .kl2-header, .kl2-strip, .kl2-footer, .kl2-dock, .kl2-mnav, .kl2c-tabs, .kl2c-acts, .kl2c-sec, .kl2c-cta, .kl2c-presets, .kl2c-hint, .kl2c-mini { display: none !important; }
    .kl2c-app { grid-template-columns: 1fr 1fr; }
    .kl2c-box, .kl2c-out { border-color: #999999; background: #FFFFFF; }
    .kl2c-out { position: static; }
    .kl2c-f input, .kl2c-f select { border-color: #999999; background: #FFFFFF; color: #000000; }
    .kl2c-big b, .kl2c-fact b, .kl2c-box-h, .kl2c-h1 { color: #000000 !important; }
}