:root {
    --sheet: #FFFFFF;
    --guide: #EEF1F4;
    --c: #00A0E3;
    --m: #E5007D;
    --y: #FFED00;
    --k: #231F20;
    --rule: #D5DAE0;
    --muted: #5B6470;
    --focus: #00A0E3;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: 'IBM Plex Sans Thai', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: var(--k);
    background: var(--guide);
    font-variant-numeric: tabular-nums;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-head { background: var(--sheet); border-bottom: 1px solid var(--rule); position: sticky; top: 0; z-index: 30; }
.site-head .wrap { display: flex; align-items: center; gap: 32px; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: -0.01em; }
.brand small { display: block; font-weight: 400; font-size: 12px; color: var(--muted); letter-spacing: 0; }
.nav { display: flex; gap: 24px; font-size: 15px; }
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--k); }
.head-actions { margin-left: auto; display: flex; align-items: center; gap: 16px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 20px; border-radius: 3px; font: inherit; font-weight: 600; font-size: 15px; text-decoration: none; cursor: pointer; border: 1.5px solid var(--k); background: var(--k); color: #fff; }
.btn:hover { background: #000; }
.btn-ghost { background: transparent; color: var(--k); }
.btn-ghost:hover { background: var(--guide); }
.btn-line { background: #06C755; border-color: #06C755; }
.btn-line:hover { background: #05B24C; }
.menu-toggle { display: none; margin-left: auto; background: none; border: 1.5px solid var(--k); border-radius: 3px; padding: 8px 12px; font: inherit; font-weight: 600; }

/* Hero */
.hero { padding: 64px 0 0; }
.hero .wrap { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: start; }
.hero-copy { padding-top: 24px; }
.overprint { display: grid; font-size: clamp(44px, 6.2vw, 84px); line-height: 1.12; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 24px; }
.overprint span { grid-area: 1 / 1; }
.overprint .sep-c { color: var(--c); mix-blend-mode: multiply; transform: translate(-7px, -5px); animation: register 1.1s cubic-bezier(.2,.7,.2,1) .25s forwards; }
.overprint .sep-m { color: var(--m); mix-blend-mode: multiply; transform: translate(6px, 4px); animation: register 1.1s cubic-bezier(.2,.7,.2,1) .35s forwards; }
.overprint .sep-k { color: var(--k); opacity: 0; animation: ink-k .5s ease-out 1.3s forwards; }
@keyframes register { to { transform: translate(0, 0); } }
@keyframes ink-k { to { opacity: 1; } }
.hero-lead { font-size: 19px; color: var(--muted); max-width: 27em; margin: 0 0 28px; }
.hero-facts { display: flex; gap: 36px; margin: 36px 0 0; padding: 20px 0 0; border-top: 1px solid var(--rule); list-style: none; }
.hero-facts li { font-size: 14px; color: var(--muted); }
.hero-facts strong { display: block; font-size: 22px; color: var(--k); }

/* Proof sheet (quote card) */
.proof { position: relative; background: var(--sheet); padding: 32px 32px 0; box-shadow: 0 1px 0 var(--rule), 0 24px 60px -30px rgba(35, 31, 32, 0.35); }
.proof::before, .proof::after { content: ""; position: absolute; width: 18px; height: 18px; border-color: var(--k); border-style: solid; }
.proof::before { top: -12px; left: -12px; border-width: 0 1px 1px 0; }
.proof::after { bottom: -12px; right: -12px; border-width: 1px 0 0 1px; }
.proof h2 { font-size: 22px; margin: 0 0 4px; }
.proof .sub { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
.field { margin-bottom: 16px; }
.field > label, .field > span { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
select, input[type="text"], input[type="tel"], input[type="number"] { width: 100%; font: inherit; font-size: 15px; padding: 10px 12px; border: 1.5px solid var(--rule); border-radius: 3px; background: #fff; color: var(--k); }
select:focus, input:focus { border-color: var(--k); outline: none; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span { display: inline-block; padding: 7px 14px; border: 1.5px solid var(--rule); border-radius: 3px; font-size: 14px; cursor: pointer; }
.chip input:checked + span { border-color: var(--k); background: var(--k); color: #fff; }
.chip input:focus-visible + span { outline: 2px solid var(--focus); outline-offset: 2px; }
.checks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.checks label { display: flex; align-items: center; gap: 8px; font-size: 14px; padding: 8px 10px; border: 1.5px solid var(--rule); border-radius: 3px; cursor: pointer; }
.checks input { accent-color: var(--k); }
.total { display: flex; align-items: end; justify-content: space-between; gap: 16px; padding: 20px 0; margin-top: 8px; border-top: 1px dashed var(--rule); }
.total .price { font-size: 38px; font-weight: 700; line-height: 1; }
.total .price small { font-size: 16px; font-weight: 500; }
.total .meta { text-align: right; font-size: 14px; color: var(--muted); }
.total .meta strong { color: var(--k); }
.proof .actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding-bottom: 20px; }
.colorbar { display: grid; grid-template-columns: repeat(12, 1fr); height: 14px; margin: 0 -32px; }
.colorbar i:nth-child(4n+1) { background: var(--c); }
.colorbar i:nth-child(4n+2) { background: var(--m); }
.colorbar i:nth-child(4n+3) { background: var(--y); }
.colorbar i:nth-child(4n+4) { background: var(--k); }
.colorbar i:nth-child(n+5):nth-child(-n+8) { opacity: .5; }
.colorbar i:nth-child(n+9) { opacity: .25; }

/* Sections */
section { padding: 96px 0; }
.sheet-band { background: var(--sheet); }
.sec-head { max-width: 640px; margin-bottom: 40px; }
.sec-head h2 { font-size: 34px; line-height: 1.25; letter-spacing: -0.015em; margin: 0 0 12px; }
.sec-head p { color: var(--muted); margin: 0; }

/* Price table */
.price-table { width: 100%; border-collapse: collapse; font-size: 16px; }
.price-table th { text-align: left; font-size: 14px; font-weight: 600; color: var(--muted); padding: 0 16px 12px 0; border-bottom: 1.5px solid var(--k); }
.price-table td { padding: 18px 16px 18px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.price-table td:first-child { font-weight: 600; font-size: 17px; }
.price-table td.num { font-weight: 600; white-space: nowrap; }
.price-table button { font: inherit; font-size: 14px; font-weight: 600; background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; text-underline-offset: 4px; }

/* Paper swatches */
.papers { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.paper figure { margin: 0; }
.paper .stock { height: 220px; border: 1px solid var(--rule); position: relative; }
.stock.gloss { background: linear-gradient(115deg, #fff 30%, #F1F4F7 45%, #fff 60%); }
.stock.matte { background: #FAFAF9; }
.stock.uncoated { background: #FBFBF8 radial-gradient(circle at 20% 30%, rgba(0,0,0,.03) 1px, transparent 1.5px) 0 0 / 7px 7px; }
.stock.kraft { background: #C9A47A radial-gradient(circle, rgba(90,60,30,.18) 1px, transparent 1.6px) 0 0 / 9px 9px; border-color: #B8926A; }
.stock.card { background: #fff; box-shadow: inset 0 -6px 0 #ECEFF2, inset 0 -7px 0 var(--rule); }
.paper figcaption { padding-top: 12px; font-size: 14px; color: var(--muted); }
.paper figcaption strong { display: block; font-size: 16px; color: var(--k); }
.finishes { margin-top: 48px; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1.5px solid var(--k); }
.finishes div { padding: 20px 20px 0 0; }
.finishes div + div { padding-left: 20px; border-left: 1px solid var(--rule); }
.finishes h3 { font-size: 17px; margin: 0 0 6px; }
.finishes p { margin: 0; font-size: 14px; color: var(--muted); }

/* Process */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; list-style: none; padding: 0; margin: 0; }
.steps li { padding: 0 28px 0 0; position: relative; }
.steps li::before { counter-increment: step; content: counter(step); display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border: 1.5px solid var(--k); border-radius: 50%; font-weight: 700; margin-bottom: 20px; background: var(--guide); position: relative; z-index: 1; }
.steps li::after { content: ""; position: absolute; top: 20px; left: 40px; right: 0; border-top: 1px dashed var(--muted); }
.steps li:last-child::after { display: none; }
.steps h3 { font-size: 18px; margin: 0 0 6px; }
.steps p { margin: 0; font-size: 15px; color: var(--muted); max-width: 22em; }

/* Tracking */
.track { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; align-items: start; }
.track form { display: flex; gap: 10px; }
.track form .btn { white-space: nowrap; flex-shrink: 0; }
.track-hint { font-size: 14px; color: var(--muted); margin: 10px 0 0; }
.track-result { border: 1px solid var(--rule); background: var(--sheet); padding: 24px; min-height: 180px; }
.track-result .empty { color: var(--muted); margin: 0; }
.track-result .err { color: #B42318; margin: 0; }
.job-head { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.job-head h3 { margin: 0; font-size: 18px; }
.job-head span { font-size: 14px; color: var(--muted); }
.stages { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; list-style: none; padding: 0; margin: 0; }
.stages li { font-size: 13px; color: var(--muted); padding-top: 12px; border-top: 4px solid var(--rule); }
.stages li.done { border-color: var(--k); color: var(--k); }
.stages li.now { border-color: var(--m); color: var(--k); font-weight: 600; }
.job-note { margin: 18px 0 0; font-size: 15px; }

/* Work */
.work { display: grid; grid-template-columns: 1.3fr 1fr; grid-template-rows: auto auto; gap: 20px; }
.work figure { margin: 0; background: var(--sheet); }
.work figure:first-child { grid-row: span 2; }
.work img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; }
.work figure:first-child { display: flex; flex-direction: column; }
.work figure:first-child img { aspect-ratio: auto; flex: 1; min-height: 0; height: auto; }
.work figure:not(:first-child) img { aspect-ratio: 16 / 10; }
.work figcaption { padding: 12px 16px 16px; font-size: 14px; color: var(--muted); }
.work figcaption strong { color: var(--k); font-size: 15px; }

/* B2B */
.b2b { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.b2b ul { list-style: none; padding: 0; margin: 0; border-top: 1.5px solid var(--k); }
.b2b li { display: grid; grid-template-columns: 180px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--rule); font-size: 15px; }
.b2b li strong { font-weight: 600; }
.b2b li span { color: var(--muted); }

/* FAQ */
.faq { max-width: 760px; }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; padding: 20px 0; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-weight: 400; font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 20px; color: var(--muted); max-width: 40em; }

/* CTA + footer */
.cta { background: var(--k); color: #fff; }
.cta .wrap { display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.cta h2 { font-size: 30px; margin: 0 0 8px; }
.cta p { margin: 0; color: #C9CDD2; }
.cta .btns { display: flex; gap: 12px; flex-shrink: 0; }
.cta .btn-ghost { color: #fff; border-color: #fff; }
.cta .btn-ghost:hover { background: rgba(255,255,255,.08); }
footer { background: var(--k); color: #C9CDD2; font-size: 14px; padding: 0 0 40px; }
footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding-top: 40px; border-top: 1px solid #3A3536; }
footer h3 { color: #fff; font-size: 15px; margin: 0 0 12px; }
footer p, footer ul { margin: 0; padding: 0; list-style: none; }
footer li { margin-bottom: 6px; }
footer a { text-decoration: none; }
footer a:hover { color: #fff; }

@media (max-width: 1024px) {
    .hero .wrap, .track, .b2b { grid-template-columns: 1fr; }
    .papers { grid-template-columns: repeat(3, 1fr); }
    .finishes { grid-template-columns: 1fr 1fr; }
    .finishes div:nth-child(3) { padding-left: 0; border-left: 0; }
    .steps { grid-template-columns: 1fr 1fr; row-gap: 40px; }
    .steps li:nth-child(2)::after { display: none; }
    footer .wrap { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
    .wrap { padding: 0 16px; }
    .nav { display: none; }
    .nav.open { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: var(--sheet); padding: 16px; border-bottom: 1px solid var(--rule); gap: 14px; }
    .menu-toggle { display: inline-block; }
    .head-actions { display: none; }
    .hero { padding-top: 36px; }
    .proof { padding: 24px 20px 0; }
    .colorbar { margin: 0 -20px; }
    .checks { grid-template-columns: 1fr 1fr; }
    .hero-facts { gap: 20px; flex-wrap: wrap; }
    section { padding: 64px 0; }
    .sec-head h2 { font-size: 27px; }
    .papers { grid-template-columns: 1fr 1fr; }
    .paper .stock { height: 140px; }
    .finishes, .steps { grid-template-columns: 1fr; }
    .finishes div + div { padding-left: 0; border-left: 0; }
    .steps li::after { display: none; }
    .price-table thead { display: none; }
    .price-table tr { display: grid; grid-template-columns: 1fr auto; padding: 14px 0; border-bottom: 1px solid var(--rule); }
    .price-table td { border: 0; padding: 2px 0; }
    .price-table td:nth-child(2) { grid-column: 1 / -1; order: 3; color: var(--muted); font-size: 14px; }
    .price-table td:nth-child(4) { display: none; }
    .price-table td:nth-child(5) { grid-column: 1 / -1; order: 4; padding-top: 6px; }
    .work { grid-template-columns: 1fr; }
    .work figure:first-child { grid-row: auto; }
    .work figure:first-child img { height: auto; aspect-ratio: 4 / 3; }
    .b2b li { grid-template-columns: 1fr; gap: 2px; }
    .track form { flex-direction: column; }
    .cta .wrap { flex-direction: column; align-items: flex-start; }
    .cta .btns { flex-direction: column; width: 100%; }
    footer .wrap { grid-template-columns: 1fr; }
}

/* ===== Colour pass: ink on the sheet ===== */
.hero { position: relative; overflow: hidden; }
.hero .wrap { position: relative; z-index: 1; }
.rosette { position: absolute; right: -40px; top: -70px; width: 860px; height: 820px; pointer-events: none; }
.rosette i { position: absolute; width: 470px; height: 470px; border-radius: 50%; mix-blend-mode: multiply; }
.rosette i:nth-child(1) { left: 70px; top: 320px; background: radial-gradient(circle, var(--c) 42%, transparent 44%) 0 0 / 13px 13px; transform: rotate(15deg); }
.rosette i:nth-child(2) { left: 330px; top: 0; background: radial-gradient(circle, var(--m) 42%, transparent 44%) 0 0 / 13px 13px; transform: rotate(75deg); }
.rosette i:nth-child(3) { left: 420px; top: 360px; background: radial-gradient(circle, var(--y) 46%, transparent 48%) 0 0 / 13px 13px; }
.hero-facts li:nth-child(1) strong { color: var(--c); }
.hero-facts li:nth-child(2) strong { color: var(--m); }
.hero-facts li:nth-child(3) strong { background: linear-gradient(transparent 58%, var(--y) 58%); width: fit-content; }
.chip input:checked + span { background: var(--c); border-color: var(--c); color: var(--k); font-weight: 600; }
.checks input { accent-color: var(--m); }
.btn-m { background: var(--m); border-color: var(--m); }
.btn-m:hover { background: #C8006C; border-color: #C8006C; }
.total .price { color: var(--m); }

.price-table tbody tr td:first-child { padding-left: 16px; box-shadow: inset 5px 0 0 var(--c); }
.price-table tbody tr:nth-child(4n+2) td:first-child { box-shadow: inset 5px 0 0 var(--m); }
.price-table tbody tr:nth-child(4n+3) td:first-child { box-shadow: inset 5px 0 0 var(--y); }
.price-table tbody tr:nth-child(4n+4) td:first-child { box-shadow: inset 5px 0 0 var(--k); }
.price-table tbody tr:hover td { background: #F3FAFE; }
.price-table td.num { color: var(--m); }

#papers { background: #FFF8C2; }
#papers .stock { border-color: #E9DA7A; }
.finishes { border-top: 0; }
.finishes div { border-top: 5px solid var(--c); padding-top: 18px; }
.finishes div:nth-child(2) { border-top-color: var(--m); }
.finishes div:nth-child(3) { border-top-color: var(--y); }
.finishes div:nth-child(4) { border-top-color: var(--k); }

#process { background: #E1F4FC; }
.steps li::before { border: 0; color: #fff; background: var(--c); }
.steps li:nth-child(2)::before { background: var(--m); }
.steps li:nth-child(3)::before { background: var(--y); color: var(--k); }
.steps li:nth-child(4)::before { background: var(--k); }
.steps li::after { border-top: 2px dotted var(--k); }

#track { background: #FDE4F1; }
#track .track-result { border-color: #F5B8D8; }
.stages li.now { border-color: var(--m); }

#work figure { border-top: 5px solid var(--c); }
#work figure:nth-child(2) { border-top-color: var(--m); }
#work figure:nth-child(3) { border-top-color: var(--y); }

#business { background: var(--sheet); }
.b2b ul { border-top: 5px solid var(--m); }
.b2b li strong { color: var(--m); }

.cta { background: var(--m); }
.cta p { color: #FFE0F0; }
.cta .btn-line { box-shadow: 0 0 0 2px #fff; }
footer { border-top: 0; }
footer::before { content: ""; display: block; height: 8px; background: linear-gradient(90deg, var(--c) 0 25%, var(--m) 25% 50%, var(--y) 50% 75%, #FFFFFF 75% 100%); opacity: .95; margin-bottom: 0; }
.cta + * { margin-top: 0; }

@media (max-width: 1024px) {
    .rosette { right: -260px; top: -200px; transform: scale(.75); opacity: .75; }
}
@media (max-width: 760px) {
    .rosette { right: -330px; top: -250px; transform: scale(.6); opacity: .55; }
}
@media (prefers-reduced-motion: reduce) {
    .overprint .sep-c, .overprint .sep-m { animation: none; transform: none; }
    .overprint .sep-k { animation: none; opacity: 1; }
    html { scroll-behavior: auto; }
}