/* iReadCustomer Academy — one stylesheet for every generated page.
   Signature: the Thai office rubber stamp ("ตรายาง") marking work that AI now does. */
:root {
  --paper: #f7f8fa;      /* cool copy-paper white, page background */
  --sheet: #ffffff;      /* task slips, cards */
  --ink: #14213d;        /* navy pen ink: text, dark surfaces */
  --ink-2: #4a5672;      /* muted ink: secondary text */
  --stamp: #ea580c;      /* stamp ink (brand orange family), decoration + large text only */
  --action: #c2410c;     /* buttons: orange dark enough for white text (AA) */
  --highlight: #ffe94d;  /* office highlighter, behind a few key words */
  --folder: #e3eaf3;     /* pale blue folder: section bands */
  --rule: #cbd5e1;       /* ruled lines, borders */
  --radius: 10px;
  --display: "Bai Jamjuree", "IBM Plex Sans Thai", system-ui, sans-serif;
  --body: "IBM Plex Sans Thai", system-ui, sans-serif;
  --hand: "Sriracha", "IBM Plex Sans Thai", cursive;
  --mono: "IBM Plex Mono", "IBM Plex Sans Thai", ui-monospace, monospace;
  --wrap: min(1120px, 100% - 32px);
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.7 var(--body); }
img { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--stamp); outline-offset: 3px; border-radius: 4px; }
.wrap { width: var(--wrap); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--sheet); padding: 8px 12px; z-index: 50; }

/* type scale */
h1, h2, h3 { font-family: var(--display); line-height: 1.25; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 5.4vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0 0 1em; }
.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 36em; }
.eyebrow { font: 600 .9rem/1.4 var(--body); color: var(--stamp); margin-bottom: 12px; }
.mark { background: linear-gradient(transparent 55%, var(--highlight) 55%, var(--highlight) 92%, transparent 92%); padding: 0 .08em; }
.muted { color: var(--ink-2); }

/* header + footer */
.top { border-bottom: 1px solid var(--rule); background: var(--paper); position: sticky; top: 0; z-index: 20; }
.top .wrap { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { font: 700 1.05rem/1 var(--display); text-decoration: none; display: flex; gap: 8px; align-items: baseline; }
.brand small { font: 400 .95rem/1 var(--hand); color: var(--stamp); }
.top nav { margin-left: auto; display: flex; gap: 20px; font-size: .95rem; }
.top nav a { text-decoration: none; color: var(--ink-2); }
.top nav a:hover { color: var(--ink); }
@media (max-width: 720px) { .top nav a:not(.btn) { display: none; } }
.foot { border-top: 1px solid var(--rule); margin-top: 96px; padding: 40px 0 56px; font-size: .9rem; color: var(--ink-2); }
.foot .wrap { display: grid; gap: 24px; grid-template-columns: 2fr 1fr; }
.foot a { color: var(--ink-2); }
@media (max-width: 720px) { .foot .wrap { grid-template-columns: 1fr; } }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px;
  border-radius: 999px; border: 2px solid var(--ink); background: var(--ink); color: #fff; font: 600 1rem/1 var(--body);
  text-decoration: none; cursor: pointer; transition: transform .15s ease; }
.btn:hover { transform: translateY(-1px); }
.btn.buy { background: var(--action); border-color: var(--action); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.small { min-height: 40px; padding: 0 16px; font-size: .9rem; }
.btn.block { width: 100%; }

/* the stamp */
.stamp { position: absolute; display: inline-block; padding: 4px 12px; border: 3px double var(--stamp); border-radius: 6px;
  color: var(--stamp); font: 400 1.15rem/1.2 var(--hand); transform: rotate(-9deg); background: rgba(255,255,255,.55);
  mix-blend-mode: multiply; pointer-events: none; white-space: nowrap; }
.stamp.thump { opacity: 0; animation: thump .45s cubic-bezier(.2,1.4,.4,1) forwards; }
@keyframes thump { 0% { opacity: 0; transform: rotate(-9deg) scale(1.9); } 60% { opacity: .95; } 100% { opacity: .9; transform: rotate(-9deg) scale(1); } }
@media (prefers-reduced-motion: reduce) { .stamp.thump { animation: none; opacity: .9; } .btn { transition: none; } }

/* hero (home) */
.hero { padding: 56px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero .ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
@media (max-width: 880px) { .hero .wrap { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .slip { padding-right: 18px; padding-bottom: 46px; } .slip .stamp { top: auto; bottom: 8px; margin-top: 0; } }
.nw { white-space: nowrap; }
.slips { position: relative; display: grid; gap: 14px; }
.slip { position: relative; background: var(--sheet); border: 1px solid var(--rule); border-radius: 4px; padding: 14px 190px 14px 44px;
  box-shadow: 0 1px 0 var(--rule), 0 10px 24px -18px rgba(20,33,61,.45);
  background-image: repeating-linear-gradient(transparent 0 27px, #eef2f7 27px 28px); }
.slip::before { content: ""; position: absolute; left: 22px; top: 0; bottom: 0; border-left: 2px solid #f6c3a8; }
.slip:nth-child(odd) { transform: rotate(-.6deg); } .slip:nth-child(even) { transform: rotate(.5deg) translateX(10px); }
.slip b { font-weight: 600; display: block; }
.slip span { font: .85rem/1.4 var(--body); font-variant-numeric: tabular-nums; color: var(--ink-2); }
.slip .stamp { right: 14px; top: 50%; margin-top: -18px; font-size: 1rem; }

/* sections */
.band { background: var(--folder); padding: 64px 0; margin-top: 24px; }
.section { padding: 64px 0 0; }
.section > .wrap > header { margin-bottom: 28px; max-width: 40em; }

/* course cards */
.feature { display: grid; grid-template-columns: 1fr 1.1fr; gap: 0; background: var(--sheet); border: 1px solid var(--rule);
  border-radius: var(--radius); overflow: hidden; text-decoration: none; }
.feature img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
.feature .body { padding: 28px 30px; display: flex; flex-direction: column; gap: 10px; }
.feature .price { margin-top: auto; display: flex; align-items: baseline; gap: 12px; }
@media (max-width: 760px) { .feature { grid-template-columns: 1fr; } }
.price strong { font: 700 1.9rem/1 var(--display); }
.price s { color: var(--ink-2); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; list-style: none; }
.chips li { font: 500 .88rem/1 var(--body); font-variant-numeric: tabular-nums; border: 1px solid var(--rule); border-radius: 999px; padding: 7px 11px; background: var(--paper); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 18px; margin-top: 28px; }
.card { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.card img { aspect-ratio: 4/3; object-fit: cover; filter: saturate(.55); }
.card .body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.card .body p { font-size: .92rem; color: var(--ink-2); margin: 0 0 10px; }
.card .body a { margin-top: auto; font-size: .9rem; font-weight: 600; color: var(--action); }
.tag { align-self: flex-start; font: 600 .78rem/1 var(--body); color: var(--ink-2);
  border: 1px dashed var(--ink-2); border-radius: 4px; padding: 5px 7px; }

/* tools */
.tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 880px) { .tools { grid-template-columns: 1fr; } }
.tool { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.tool .price { font: 600 .95rem/1.4 var(--mono); }
.tool .btn { margin-top: auto; align-self: flex-start; }

/* course page */
.crumbs { font-size: .88rem; color: var(--ink-2); padding-top: 22px; }
.crumbs a { color: var(--ink-2); }
.course { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; padding-top: 18px; }
@media (max-width: 960px) { .course { grid-template-columns: 1fr; } }
.preview { position: relative; display: block; border-radius: var(--radius); overflow: hidden; background: var(--ink); margin: 24px 0 8px; }
.preview img { aspect-ratio: 16/9; object-fit: cover; width: 100%; }
.preview .play { position: absolute; inset: auto auto 18px 18px; }
.buybox { position: sticky; top: 88px; align-self: start; background: var(--sheet); border: 1px solid var(--rule);
  border-radius: var(--radius); padding: 24px; box-shadow: 0 18px 40px -30px rgba(20,33,61,.6); }
.buybox .note { font-size: .85rem; color: var(--ink-2); margin: 10px 0 0; }
.buybox ul { padding-left: 1.1em; margin: 16px 0; font-size: .95rem; }
.ticks { list-style: none; padding: 0; display: grid; gap: 12px; }
.ticks li { position: relative; padding-left: 34px; }
.ticks li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 24px; height: 24px; border: 2px solid var(--stamp);
  border-radius: 50%; color: var(--stamp); font: 700 .8rem/20px var(--body); text-align: center; transform: rotate(-8deg); }
.module { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--sheet); margin-bottom: 10px; }
.module summary { cursor: pointer; padding: 16px 18px; display: flex; gap: 12px; align-items: baseline; list-style: none; }
.module summary::-webkit-details-marker { display: none; }
.module summary::after { content: "+"; margin-left: auto; font: 600 1.2rem/1 var(--mono); }
.module[open] summary::after { content: "−"; }
.module summary .meta { font: .85rem/1 var(--body); font-variant-numeric: tabular-nums; color: var(--ink-2); white-space: nowrap; }
.module ol { list-style: none; margin: 0; padding: 0 18px 12px; }
.module li { display: flex; gap: 10px; align-items: baseline; padding: 9px 0; border-top: 1px dashed var(--rule); font-size: .95rem; }
.module li .dur { margin-left: auto; font: .8rem/1 var(--mono); color: var(--ink-2); }
.module li a { color: var(--action); font-weight: 600; }
.pill { font: 600 .78rem/1 var(--body); padding: 5px 8px; border-radius: 4px; background: var(--highlight); color: var(--ink); white-space: nowrap; }
.teams { background: var(--ink); color: #fff; border-radius: var(--radius); padding: 28px; display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; }
.teams p { color: #c9d2e3; margin: 0; }
.teams .btn { background: #fff; color: var(--ink); border-color: #fff; }
@media (max-width: 720px) { .teams { grid-template-columns: 1fr; } }
.faq details { border-bottom: 1px solid var(--rule); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 10px 0 0; color: var(--ink-2); }
.mobilebar { display: none; }
@media (max-width: 960px) {
  .buybox { position: static; }
  .mobilebar { display: flex; position: fixed; inset: auto 0 0 0; z-index: 30; background: var(--sheet); border-top: 1px solid var(--rule);
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); gap: 12px; align-items: center; }
  .mobilebar .price strong { font-size: 1.4rem; }
  .mobilebar .btn { margin-left: auto; }
  body.has-bar { padding-bottom: 84px; }
}

/* player */
.player { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; padding-top: 20px; }
@media (max-width: 960px) { .player { grid-template-columns: 1fr; } }
.screen { position: relative; background: var(--ink); border-radius: var(--radius); overflow: hidden; aspect-ratio: 16/9; }
.screen video { width: 100%; height: 100%; display: block; background: #000; }
.lock { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 12px; color: #fff; padding: 24px; background: var(--ink); }
.lock p { color: #c9d2e3; margin: 0; }
.lessons { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--radius); max-height: 70vh; overflow: auto; }
.lessons h3 { padding: 14px 16px 6px; margin: 0; font-size: .95rem; }
.lessons button { all: unset; box-sizing: border-box; width: 100%; display: flex; gap: 10px; align-items: baseline; padding: 10px 16px; cursor: pointer; font-size: .92rem; border-top: 1px dashed var(--rule); }
.lessons button:hover, .lessons button[aria-current="true"] { background: var(--folder); }
.lessons button:focus-visible { outline: 3px solid var(--stamp); outline-offset: -3px; }
.lessons .state { width: 18px; flex: none; color: var(--stamp); font-weight: 700; }
.lessons .dur { margin-left: auto; font: .78rem/1 var(--mono); color: var(--ink-2); }
.banner { background: var(--highlight); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 18px; }
.banner code { font: .85rem/1.4 var(--mono); word-break: break-all; }