/* Public landing page ("/"). Standalone from style.css (the app shell); same Delfts tokens so the two read as one
   product. Dark is "Delft at night", manual only like the app: landing.html sets data-theme from dl_theme. */
:root {
  --bg: #EEF2F8; --panel: #FFFFFF; --panel-2: #E7EDF6; --ink: #16204A; --ink-2: #3A4676; --muted: #6B76A0; --line: #CDD8EC;
  --accent: #1B3A8C; --accent-soft: #DFE7F6; --accent-ink: #14306E; --btn-ink: #FFFFFF; --focus: #1B3A8C;
  --voc: #1B3A8C; --voc-soft: #DFE7F6; --gram: #2F6FB5; --gram-soft: #DEEBF7; --spk: #2E7D6B; --spk-soft: #DCEFE9;
  --exam: #6B4FA8; --exam-soft: #E9E4F5; --green: #2E7D6B; --red: #B3322B; --red-soft: #F6E2E0;
  --pop: #E07A2E; --pop-soft: #F7E1CE; --pop-ink: #A24E17;
  --radius: 7px; --shadow: 0 1px 2px rgba(22,32,74,.06), 0 10px 26px -16px rgba(22,32,74,.28);
  --display: "Fraunces", Georgia, "Times New Roman", serif;
  --body: "Work Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #01040F; --panel: #050B20; --panel-2: #0A1430; --ink: #E9EEFA; --ink-2: #BCC7E6; --muted: #7F8DB8; --line: #142050;
  --accent: #3560C8; --accent-soft: #0E1D4A; --accent-ink: #A9C1F7; --focus: #7FA2EE;
  --voc: #7FA2EE; --voc-soft: #0E1D4A; --gram: #7FB3EC; --gram-soft: #0C1D42; --spk: #56C1A4; --spk-soft: #082420;
  --exam: #B39AF0; --exam-soft: #1C1640; --green: #56C1A4; --red: #F07A70; --red-soft: #2C0F1A;
  --pop: #F0924A; --pop-soft: #2A1808; --pop-ink: #FFB27A;
  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 10px 26px -14px rgba(0,0,0,.8);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--body); }
h1, h2, h3 { font-family: var(--display); line-height: 1.12; margin: 0 0 .5em; letter-spacing: -.01em; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); font-weight: 600; }
h3 { font-size: 1.2rem; font-weight: 600; }
p { margin: 0 0 1em; }
a { color: var(--accent-ink); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
[hidden] { display: none !important; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 760px; }
.center { text-align: center; }
section { padding: clamp(56px, 8vw, 96px) 0; }
section.band { background: var(--panel-2); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

.eyebrow { font: 600 .78rem/1.3 var(--body); letter-spacing: .08em; text-transform: uppercase; color: var(--pop-ink); margin-bottom: .8em; }
.eyebrow.spk { color: var(--spk); } .eyebrow.gram { color: var(--gram); }
.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 40em; }
.fine { font-size: .9rem; color: var(--muted); }
.aside { margin-top: 28px; color: var(--ink-2); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 22px;
  border-radius: var(--radius); border: 1.5px solid var(--accent); background: var(--accent); color: var(--btn-ink);
  font: 600 1rem var(--body); text-decoration: none; cursor: pointer; }
.btn:hover { filter: brightness(1.1); }
.btn.ghost { background: transparent; color: var(--accent-ink); }
.btn.small { min-height: 38px; padding: 0 16px; font-size: .92rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }

/* header */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top-row { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 600 1.15rem var(--display); color: var(--ink); text-decoration: none; }
.mark svg { width: 30px; height: 30px; fill: var(--accent); color: var(--accent); display: block; }
.top-nav { display: flex; gap: 22px; margin-left: auto; }
.top-nav a { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.top-nav a:hover { color: var(--accent-ink); }
.top-actions { display: flex; align-items: center; gap: 16px; }
.top-actions .link { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.brand, .top-actions a { white-space: nowrap; }
@media (max-width: 860px) { .top-nav { display: none; } .top-actions { margin-left: auto; } }
@media (max-width: 480px) { .top-actions .link { display: none; } .brand { font-size: 1.05rem; } }

/* hero */
.hero { padding-top: clamp(40px, 7vw, 88px); }
.hero-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 14px; }
.result { margin: 0; }
.sentence { font: 500 1.35rem/1.5 var(--display); margin: .3em 0 1em; }
.w { border-bottom: 3px solid transparent; padding-bottom: 1px; }
.w.ok { border-color: color-mix(in srgb, var(--green) 55%, transparent); }
.w.bad { border-color: var(--pop); background: var(--pop-soft); border-radius: 3px 3px 0 0; }
.gauges { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
.gauges div { background: var(--panel-2); border-radius: var(--radius); padding: 10px 14px; }
.g-num { display: block; font: 600 1.6rem var(--display); }
.g-lbl { font-size: .85rem; color: var(--muted); }
.diag { font-size: .95rem; margin-bottom: 8px; }
.ipa { font-family: var(--mono); background: var(--pop-soft); color: var(--pop-ink); padding: 2px 8px; border-radius: 4px; }
.coach { color: var(--ink-2); }

/* grids */
.grid { display: grid; gap: 20px; margin-top: 32px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two-cards { grid-template-columns: repeat(2, 1fr); }
.grid.one-card { grid-template-columns: minmax(0, 460px); }
.way .seg-picker { margin-top: 18px; }
.way .ticks { margin-bottom: 0; }
.way .seg-strip { flex-wrap: wrap; }
.way .seg { flex-basis: 96px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.tag { display: inline-block; font: 700 .85rem var(--body); padding: 3px 10px; border-radius: 99px; margin-bottom: 12px; }
.tag.exam { background: var(--exam-soft); color: var(--exam); }
.tag.voc { background: var(--voc-soft); color: var(--voc); } .tag.gram { background: var(--gram-soft); color: var(--gram); }
.goal p:last-child { margin: 0; color: var(--ink-2); }

/* accent coach */
.steps { padding-left: 1.3em; margin: 24px 0 0; }
.steps li { margin-bottom: 12px; color: var(--ink-2); }
.steps strong { color: var(--ink); }
.coach-card .q { font: 600 1.25rem var(--display); }
.coach-card .lbl { display: inline-block; min-width: 5.5em; font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.coach-card .you span[lang] { text-decoration: line-through; text-decoration-color: var(--red); }
.coach-card .better strong { color: var(--spk); }
.coach-card .why { color: var(--ink-2); border-top: 1px solid var(--line); padding-top: 12px; margin: 0; }

/* sessions */
.seg-picker { display: flex; gap: 8px; margin-top: 28px; }
.chip { min-height: 40px; padding: 0 18px; border-radius: 99px; border: 1.5px solid var(--line); background: var(--panel); color: var(--ink); font: 600 .95rem var(--body); cursor: pointer; }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--btn-ink); }
.seg-strip { display: flex; gap: 6px; list-style: none; padding: 0; margin: 20px 0 0; }
.seg { flex-basis: 0; min-width: 0; padding: 14px 12px; border-radius: var(--radius); }
.seg.words { background: var(--voc-soft); border-top: 4px solid var(--voc); }
.seg.grammar { background: var(--gram-soft); border-top: 4px solid var(--gram); }
.seg.speaking { background: var(--spk-soft); border-top: 4px solid var(--spk); }
.seg-name { display: block; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.seg-n { font-size: .85rem; color: var(--muted); }

/* try one */
.prompt { font-size: 1.1rem; font-weight: 500; }
.answer { min-height: 56px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 8px; border: 1.5px dashed var(--line); border-radius: var(--radius); margin-bottom: 14px; }
.placeholder { color: var(--muted); font-size: .92rem; padding-left: 6px; }
.pool { display: flex; flex-wrap: wrap; gap: 8px; min-height: 46px; }
.token { min-height: 42px; padding: 0 14px; border-radius: var(--radius); border: 1.5px solid var(--line); background: var(--panel-2); color: var(--ink); font: 500 1.05rem var(--body); cursor: pointer; }
.token.placed { background: var(--gram-soft); border-color: var(--gram); }
.token[disabled] { visibility: hidden; }
.try-actions { display: flex; gap: 10px; margin-top: 18px; }
.try-feedback { margin: 14px 0 0; min-height: 1.6em; }
.try-feedback.good { color: var(--spk); } .try-feedback.bad { color: var(--red); }

/* progress chart */
.chart-card { margin: 0; }
.chart { width: 100%; height: auto; display: block; }
.chart .band-b1 { fill: var(--spk-soft); } .chart .band-a2 { fill: var(--gram-soft); }
.chart .edge { stroke: var(--line); stroke-dasharray: 3 3; }
.chart text { font: 500 11px var(--body); fill: var(--muted); }
.chart .lbl { font-weight: 600; fill: var(--ink); }
.chart .est { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.chart .test { fill: var(--pop); stroke: var(--panel); stroke-width: 2; }
.legend { font-size: .85rem; color: var(--muted); margin: 10px 0 0; display: flex; align-items: center; gap: 8px; }
.key { display: inline-block; width: 14px; height: 4px; border-radius: 2px; background: var(--accent); }
.key.test { width: 10px; height: 10px; border-radius: 50%; background: var(--pop); margin-left: 12px; }

/* inside */
.numbers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; list-style: none; padding: 0; margin: 0; text-align: center; color: var(--ink-2); }
.numbers strong { display: block; font: 700 clamp(1.8rem, 4vw, 2.6rem) var(--display); color: var(--accent-ink); }
.tiles { margin-top: 48px; }
.tile { padding: 4px 0; }
.tile h3 { font-size: 1.05rem; }
.tile p { color: var(--ink-2); margin: 0; }

/* pricing */
.price .amount { font: 700 1.8rem var(--display); color: var(--accent-ink); margin-bottom: .2em; }
.ticks { list-style: none; padding: 0; margin: 18px 0 24px; }
.ticks li { padding-left: 1.6em; position: relative; margin-bottom: 8px; color: var(--ink-2); }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--spk); font-weight: 700; }

/* faq */
details { border-bottom: 1px solid var(--line); padding: 4px 0; }
summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
details p { color: var(--ink-2); }

.closing h2 { margin-bottom: 24px; }
.foot { padding: 28px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
.foot-row { display: flex; gap: 20px; }
.foot a { color: var(--muted); }

@media (max-width: 860px) {
  .hero-grid, .two { grid-template-columns: 1fr; gap: 36px; }
  .grid.three, .grid.two-cards, .grid.one-card { grid-template-columns: 1fr; }
  .numbers { grid-template-columns: repeat(2, 1fr); }
  .seg-strip { flex-direction: column; }
  .seg { flex-grow: 0 !important; }
}