/* Page shell: colour tokens, light/dark themes, hero, product cards, tabs, footer (.pi-*) */
:root {
  --page-bg: #f4f6fa; --page-ink: #1c2230; --pi-card: #ffffff; --pi-muted: #5b6375; --pi-line: #e3e6ee;
  --pi-sa: #2f6fe4; --pi-va: #d63f84; --pi-sa-soft: #e8f0ff; --pi-va-soft: #fde8f1; --pi-tabbar: #e9ecf3;
  --pi-shadow: 0 18px 40px -22px rgb(20 30 60 / 0.35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --page-bg: #12151c; --page-ink: #eceef3; --pi-card: #1d212b; --pi-muted: #a5acbb; --pi-line: #323846;
    --pi-sa: #7aa7ff; --pi-va: #ff7fb4; --pi-sa-soft: #24304a; --pi-va-soft: #3a2432; --pi-tabbar: #1a1e27;
    --pi-shadow: 0 18px 40px -22px rgb(0 0 0 / 0.8); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --page-bg: #12151c; --page-ink: #eceef3; --pi-card: #1d212b; --pi-muted: #a5acbb; --pi-line: #323846;
  --pi-sa: #7aa7ff; --pi-va: #ff7fb4; --pi-sa-soft: #24304a; --pi-va-soft: #3a2432; --pi-tabbar: #1a1e27;
  --pi-shadow: 0 18px 40px -22px rgb(0 0 0 / 0.8); color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--page-bg); color: var(--page-ink); font-family: "Inter", system-ui, sans-serif; line-height: 1.55; overflow-x: hidden; }

.pi-hero { max-width: 1120px; margin: 0 auto; padding: clamp(48px, 8vw, 104px) clamp(16px, 4vw, 56px) clamp(28px, 4vw, 48px); text-align: center; }
.pi-eyebrow { display: inline-block; margin: 0 0 16px; padding: 6px 14px; border-radius: 999px; background: var(--pi-card); border: 1px solid var(--pi-line); color: var(--pi-muted); font-size: 14px; font-weight: 500; }
.pi-hero h1 { margin: 0 auto 16px; max-width: 820px; font-size: clamp(32px, 5vw, 58px); line-height: 1.06; font-weight: 800; letter-spacing: -0.025em; text-wrap: balance; }
.pi-hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--pi-sa), var(--pi-va)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.pi-lede { margin: 0 auto; max-width: 680px; color: var(--pi-muted); font-size: clamp(16px, 1.5vw, 19px); text-wrap: pretty; }

.pi-products { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: clamp(14px, 2vw, 24px); max-width: 1000px; margin: clamp(32px, 4vw, 48px) auto 0; padding: 0; text-align: start; }
.pi-product { --c: var(--pi-sa); --soft: var(--pi-sa-soft); display: flex; flex-direction: column; gap: 12px; padding: 24px; border-radius: 20px; background: var(--pi-card); border: 1px solid var(--pi-line); box-shadow: var(--pi-shadow); }
.pi-product[data-app="vocabulary"] { --c: var(--pi-va); --soft: var(--pi-va-soft); }
.pi-product-top { display: flex; align-items: center; gap: 12px; }
.pi-icon { flex: none; display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: var(--soft); color: var(--c); }
.pi-icon svg { width: 22px; height: 22px; }
.pi-product h2 { margin: 0; font-size: 20px; line-height: 1.2; font-weight: 800; letter-spacing: -0.01em; }
.pi-domain { margin: 2px 0 0; color: var(--pi-muted); font-size: 14px; }
.pi-product p.pi-pitch { margin: 0; font-size: 16px; }
.pi-badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.pi-badges li { padding: 3px 10px; border-radius: 999px; background: var(--soft); color: var(--c); font-size: 13px; font-weight: 700; }
.pi-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; padding-top: 4px; }
.pi-btn { display: inline-flex; align-items: center; gap: 6px; min-height: 42px; padding: 0 18px; border-radius: 999px; border: 1px solid var(--pi-line); background: transparent; color: inherit; font: inherit; font-size: 15px; font-weight: 700; text-decoration: none; cursor: pointer; }
.pi-btn--fill { background: var(--c); border-color: var(--c); color: #fff; }
:root[data-theme="dark"] .pi-btn--fill { color: #0f1320; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .pi-btn--fill { color: #0f1320; } }
.pi-btn:hover { border-color: var(--c); }
.pi-btn--fill:hover { filter: brightness(1.08); }
.pi-btn:focus-visible, .pi-tab:focus-visible { outline: 3px solid var(--c, var(--pi-sa)); outline-offset: 2px; }
.pi-btn svg { width: 16px; height: 16px; }

.pi-tabs-wrap { position: sticky; top: 0; z-index: 5; padding: 12px 16px; background: color-mix(in srgb, var(--page-bg) 88%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.pi-tabs { display: flex; gap: 4px; width: max-content; max-width: 100%; margin: 0 auto; padding: 4px; border-radius: 999px; background: var(--pi-tabbar); border: 1px solid var(--pi-line); }
.pi-tab { --c: var(--pi-sa); display: inline-flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 clamp(14px, 2.4vw, 22px); border: 0; border-radius: 999px; background: transparent; color: var(--pi-muted); font: inherit; font-size: 15px; font-weight: 700; white-space: nowrap; cursor: pointer; }
.pi-tab[data-app="vocabulary"] { --c: var(--pi-va); }
.pi-tab::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--c); }
.pi-tab[aria-selected="true"] { background: var(--pi-card); color: var(--page-ink); box-shadow: 0 2px 8px -2px rgb(20 30 60 / 0.25); }
.pi-tabs-wrap:not(.is-ready) { display: none; }
.pi-panel[hidden] { display: none; }
.pi-panel { scroll-margin-top: 72px; }

.pi-foot { padding: 32px 16px 48px; text-align: center; color: var(--pi-muted); font-size: 14px; border-top: 1px solid var(--pi-line); }
.pi-foot p { margin: 0; }
/* Footer legal + support links: wrapping row, logical spacing for RTL */
.pi-foot-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 20px; margin-block-start: 16px; margin-inline: auto; max-width: 900px; }
.pi-foot-links a { display: inline-block; padding-block: 6px; color: var(--pi-muted); text-decoration: underline; text-underline-offset: 3px; }
.pi-foot-links a:hover, .pi-foot-links a:focus-visible { color: var(--page-ink); }

@media (max-width: 720px) {
  .pi-products { grid-template-columns: 1fr; }
  .pi-tab { font-size: 14px; }
}


/* Summary App features block (.saf-*): desktop frame with an overlapping phone per feature */
.saf {
  --saf-bg: transparent;
  --saf-card: #ffffff;
  --saf-ink: #1c2230;
  --saf-muted: #5b6375;
  --saf-line: #e3e6ee;
  --saf-frame: #eef0f5;
  --saf-accent: #2f6fe4;
  --saf-accent-2: #d1336f;
  --saf-tick-bg: #e8f0ff;
  --saf-shadow: 0 18px 40px -18px rgb(20 30 60 / 0.28);
  background: var(--saf-bg);
  color: var(--saf-ink);
  font-family: var(--saf-font, inherit);
  line-height: 1.55;
  padding: clamp(40px, 6vw, 88px) clamp(16px, 4vw, 56px);
  box-sizing: border-box;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .saf {
    --saf-card: #1d212b; --saf-ink: #eceef3; --saf-muted: #a5acbb; --saf-line: #323846;
    --saf-frame: #282d39; --saf-accent: #7aa7ff; --saf-accent-2: #ff7fae; --saf-tick-bg: #24304a;
    --saf-shadow: 0 18px 40px -18px rgb(0 0 0 / 0.7);
  }
  :root:not([data-theme="light"]) .saf-cta { color: #0f1320; }
}
[data-theme="dark"] .saf {
  --saf-card: #1d212b; --saf-ink: #eceef3; --saf-muted: #a5acbb; --saf-line: #323846;
  --saf-frame: #282d39; --saf-accent: #7aa7ff; --saf-accent-2: #ff7fae; --saf-tick-bg: #24304a;
  --saf-shadow: 0 18px 40px -18px rgb(0 0 0 / 0.7);
}
.saf *, .saf *::before, .saf *::after { box-sizing: border-box; }

.saf-head { text-align: center; max-width: 720px; margin: 0 auto clamp(32px, 5vw, 64px); }
.saf-head h2 { margin: 0 0 12px; font-size: clamp(28px, 3.6vw, 44px); line-height: 1.12; font-weight: 800; letter-spacing: -0.02em; text-wrap: balance; }
.saf-head p { margin: 0; color: var(--saf-muted); font-size: clamp(16px, 1.4vw, 19px); text-wrap: pretty; }

.saf-list { display: flex; flex-direction: column; gap: clamp(16px, 2.4vw, 28px); max-width: 1440px; margin: 0 auto; padding: 0; list-style: none; }
.saf-row {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); align-items: center;
  gap: clamp(24px, 5vw, 80px); padding: clamp(24px, 4vw, 56px);
  background: var(--saf-card); border: 1px solid var(--saf-line); border-radius: 20px;
}
.saf-row:nth-child(even) { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
.saf-row:nth-child(even) .saf-text { order: 2; }

.saf-kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 10px; color: var(--saf-accent); font-size: 13px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.saf-kicker svg { width: 18px; height: 18px; flex: none; }
.saf-text h3 { margin: 0 0 10px; font-size: clamp(22px, 2.3vw, 30px); line-height: 1.2; font-weight: 800; letter-spacing: -0.015em; text-wrap: balance; }
.saf-text > p { margin: 0 0 18px; color: var(--saf-muted); font-size: clamp(15px, 1.2vw, 17px); text-wrap: pretty; }
.saf-does { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 8px; }
.saf-does li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; font-weight: 500; }
.saf-does li::before {
  content: ""; flex: none; width: 20px; height: 20px; margin-top: 1px; border-radius: 50%;
  background: var(--saf-tick-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M6 10.5l2.5 2.5L14 7.5' fill='none' stroke='%232f6fe4' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px no-repeat;
}

.saf-cta {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 22px; padding: 12px 20px; border-radius: 999px;
  background: var(--saf-accent); color: #fff; font-size: 15px; font-weight: 700; text-decoration: none; transition: transform .15s, background .15s;
}
.saf-cta:hover { background: var(--saf-accent-2); color: #fff; transform: translateY(-1px); }
.saf-cta:focus-visible { outline: 2px solid var(--saf-accent); outline-offset: 3px; }
[data-theme="dark"] .saf-cta, [data-theme="dark"] .saf-cta:hover { color: #0f1320; }

/* Screens: desktop browser frame with a phone overlapping its lower corner */
.saf-shots { position: relative; padding-bottom: 8%; padding-inline-end: 12%; }
.saf-row:nth-child(even) .saf-shots { padding-inline-end: 0; padding-inline-start: 12%; }
.saf-desk { border-radius: 12px; overflow: hidden; background: var(--saf-frame); border: 1px solid var(--saf-line); box-shadow: var(--saf-shadow); }
.saf-desk::before { content: ""; display: block; height: 22px; background: radial-gradient(circle, #ff6159 3.5px, transparent 4px) 10px 50% / 13px 100% no-repeat, radial-gradient(circle, #ffbd2e 3.5px, transparent 4px) 23px 50% / 13px 100% no-repeat, radial-gradient(circle, #28c941 3.5px, transparent 4px) 36px 50% / 13px 100% no-repeat; border-bottom: 1px solid var(--saf-line); }
.saf-desk img, .saf-desk .saf-ph { display: block; width: 100%; aspect-ratio: 16 / 10.5; object-fit: cover; object-position: top; }
.saf-phone {
  position: absolute; bottom: 0; inset-inline-end: 0; width: 27%;
  padding: 5px; border-radius: 22px; background: #111318; box-shadow: var(--saf-shadow);
}
.saf-row:nth-child(even) .saf-phone { inset-inline-end: auto; inset-inline-start: 0; }
.saf-phone img, .saf-phone .saf-ph { display: block; width: 100%; aspect-ratio: 390 / 760; object-fit: cover; object-position: top; border-radius: 17px; }
.saf-ph {
  display: grid; place-items: center; padding: 8px; text-align: center; font: 500 12px/1.3 ui-monospace, Menlo, monospace; color: var(--saf-muted);
  background: repeating-linear-gradient(135deg, var(--saf-frame) 0 10px, var(--saf-card) 10px 20px);
}

@media (max-width: 820px) {
  .saf-row, .saf-row:nth-child(even) { grid-template-columns: minmax(0, 1fr); }
  .saf-row:nth-child(even) .saf-text { order: 0; }
  .saf-shots, .saf-row:nth-child(even) .saf-shots { padding-inline: 0 14%; padding-bottom: 10%; }
  .saf-row:nth-child(even) .saf-phone { inset-inline-start: auto; inset-inline-end: 0; }
  .saf-phone { width: 30%; border-radius: 16px; padding: 4px; }
  .saf-phone img, .saf-phone .saf-ph { border-radius: 12px; }
}


/* Vocabulary Assistant features block (.vaf-*): a fan of phone screens per feature */
.vaf {
  --vaf-bg: transparent;
  --vaf-card: #ffffff;
  --vaf-ink: #1c2230;
  --vaf-muted: #5b6375;
  --vaf-line: #e3e6ee;
  --vaf-glow: #eef3ff;
  --vaf-accent: #1f6fff;
  --vaf-accent-2: #d63f84;
  --vaf-tick-bg: #e8f0ff;
  --vaf-bezel: #15171c;
  --vaf-shadow: 0 22px 44px -20px rgb(20 30 60 / 0.38);
  background: var(--vaf-bg);
  color: var(--vaf-ink);
  font-family: var(--vaf-font, inherit);
  line-height: 1.55;
  padding: clamp(40px, 6vw, 88px) clamp(16px, 4vw, 56px);
  box-sizing: border-box;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .vaf {
    --vaf-card: #1d212b; --vaf-ink: #eceef3; --vaf-muted: #a5acbb; --vaf-line: #323846;
    --vaf-glow: #232a3a; --vaf-accent: #7aa7ff; --vaf-accent-2: #ff7fb4; --vaf-tick-bg: #24304a;
    --vaf-bezel: #000000; --vaf-shadow: 0 22px 44px -20px rgb(0 0 0 / 0.8);
  }
  :root:not([data-theme="light"]) .vaf-cta, :root:not([data-theme="light"]) .vaf-cta:hover { color: #0f1320; }
}
[data-theme="dark"] .vaf {
  --vaf-card: #1d212b; --vaf-ink: #eceef3; --vaf-muted: #a5acbb; --vaf-line: #323846;
  --vaf-glow: #232a3a; --vaf-accent: #7aa7ff; --vaf-accent-2: #ff7fb4; --vaf-tick-bg: #24304a;
  --vaf-bezel: #000000; --vaf-shadow: 0 22px 44px -20px rgb(0 0 0 / 0.8);
}
.vaf *, .vaf *::before, .vaf *::after { box-sizing: border-box; }

.vaf-head { text-align: center; max-width: 720px; margin: 0 auto clamp(32px, 5vw, 64px); }
.vaf-head h2 { margin: 0 0 12px; font-size: clamp(28px, 3.6vw, 44px); line-height: 1.12; font-weight: 800; letter-spacing: -0.02em; text-wrap: balance; }
.vaf-head p { margin: 0; color: var(--vaf-muted); font-size: clamp(16px, 1.4vw, 19px); text-wrap: pretty; }

.vaf-list { display: flex; flex-direction: column; gap: clamp(16px, 2.4vw, 28px); max-width: 1440px; margin: 0 auto; padding: 0; list-style: none; }
.vaf-row {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); align-items: center;
  gap: clamp(24px, 5vw, 80px); padding: clamp(24px, 4vw, 56px);
  background: var(--vaf-card); border: 1px solid var(--vaf-line); border-radius: 20px; overflow: hidden;
}
.vaf-row:nth-child(even) { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); }
.vaf-row:nth-child(even) .vaf-text { order: 2; }

.vaf-kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 10px; color: var(--vaf-accent); font-size: 13px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.vaf-kicker svg { width: 18px; height: 18px; flex: none; }
.vaf-text h3 { margin: 0 0 10px; font-size: clamp(22px, 2.3vw, 30px); line-height: 1.2; font-weight: 800; letter-spacing: -0.015em; text-wrap: balance; }
.vaf-text > p { margin: 0 0 18px; color: var(--vaf-muted); font-size: clamp(15px, 1.2vw, 17px); text-wrap: pretty; }
.vaf-does { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 8px; }
.vaf-does li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; font-weight: 500; }
.vaf-does li::before {
  content: ""; flex: none; width: 20px; height: 20px; margin-top: 1px; border-radius: 50%;
  background: var(--vaf-tick-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M6 10.5l2.5 2.5L14 7.5' fill='none' stroke='%231f6fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px no-repeat;
}

.vaf-cta {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 22px; padding: 12px 20px; border-radius: 999px;
  background: var(--vaf-accent); color: #fff; font-size: 15px; font-weight: 700; text-decoration: none; transition: transform .15s, background .15s;
}
.vaf-cta:hover { background: var(--vaf-accent-2); color: #fff; transform: translateY(-1px); }
.vaf-cta:focus-visible { outline: 2px solid var(--vaf-accent); outline-offset: 3px; }
[data-theme="dark"] .vaf-cta, [data-theme="dark"] .vaf-cta:hover { color: #0f1320; }

/* Screens: a fan of phones, the middle one in front */
.vaf-shots {
  position: relative; display: flex; justify-content: center; align-items: center;
  padding: 4% 2% 6%; border-radius: 16px;
  background: radial-gradient(ellipse 70% 60% at 50% 55%, var(--vaf-glow), transparent 75%);
}
.vaf-phone {
  position: relative; flex: none; width: 34%; padding: 2.2%; border-radius: 13% / 6%;
  background: var(--vaf-bezel); box-shadow: var(--vaf-shadow);
}
.vaf-phone::before {
  content: ""; position: absolute; z-index: 1; top: 3.4%; left: 50%; width: 28%; height: 2.4%;
  transform: translateX(-50%); border-radius: 999px; background: var(--vaf-bezel);
}
.vaf-phone img, .vaf-phone .vaf-ph {
  display: block; width: 100%; height: auto; aspect-ratio: 723 / 1568; object-fit: cover; object-position: top;
  border-radius: 11% / 5.1%; background: #f0f1f7;
}
.vaf-phone + .vaf-phone { margin-inline-start: -7%; }
.vaf-shots[data-count="3"] .vaf-phone:nth-child(1) { transform: translateY(7%) rotate(-4deg); }
.vaf-shots[data-count="3"] .vaf-phone:nth-child(2) { z-index: 2; width: 37%; }
.vaf-shots[data-count="3"] .vaf-phone:nth-child(3) { transform: translateY(7%) rotate(4deg); }
.vaf-shots[data-count="2"] .vaf-phone { width: 40%; }
.vaf-shots[data-count="2"] .vaf-phone:nth-child(1) { z-index: 2; transform: rotate(-3deg); }
.vaf-shots[data-count="2"] .vaf-phone:nth-child(2) { transform: translateY(8%) rotate(3deg); }
.vaf-ph {
  display: grid; place-items: center; padding: 8px; text-align: center; font: 500 11px/1.3 ui-monospace, Menlo, monospace; color: var(--vaf-muted);
  background: repeating-linear-gradient(135deg, var(--vaf-glow) 0 10px, var(--vaf-card) 10px 20px);
}

@media (max-width: 820px) {
  .vaf-row, .vaf-row:nth-child(even) { grid-template-columns: minmax(0, 1fr); }
  .vaf-row:nth-child(even) .vaf-text { order: 0; }
  .vaf-shots { padding-inline: 0; }
}