/* ============================================================
   Recall — Revision that actually sticks
   Design system + page styles
   ============================================================ */

:root {
  /* Brand */
  --ink:        #14151A;
  --ink-soft:   #3A3D4A;
  --muted:      #6B6F80;
  --line:       #E7E8EF;
  --paper:      #FBFBF8;
  --paper-2:    #F4F4F0;
  --white:      #FFFFFF;

  --indigo:     #4338CA;
  --indigo-2:   #6D5EF6;
  --violet:     #7C3AED;
  --green:      #10B981;
  --amber:      #F59E0B;

  --grad: linear-gradient(120deg, #6D5EF6 0%, #4338CA 100%);

  --shadow-sm: 0 1px 2px rgba(20,21,26,.06), 0 1px 1px rgba(20,21,26,.04);
  --shadow-md: 0 10px 30px -12px rgba(40,34,120,.18);
  --shadow-lg: 0 30px 60px -22px rgba(40,34,120,.28);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;

  --maxw: 1140px;

  --font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --serif: 'Fraunces', Georgia, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
s { color: var(--muted); font-weight: 500; margin-left: .3em; font-size: .8em; }
code { font-family: ui-monospace, 'SFMono-Regular', Menlo, monospace; background: var(--paper-2); padding: .1em .4em; border-radius: 6px; font-size: .88em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 760px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.12; letter-spacing: -.02em; font-weight: 800; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4.1rem); }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.7rem); }
h3 { font-size: 1.25rem; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.2rem); color: var(--ink-soft); max-width: 60ch; }
.grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.eyebrow {
  display: inline-block;
  font-size: .82rem; font-weight: 700; letter-spacing: .04em;
  color: var(--indigo);
  background: rgba(99,91,246,.1);
  padding: .35em .8em; border-radius: 100px; margin-bottom: 1rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font-family: var(--font); font-weight: 700; font-size: .95rem;
  padding: .72em 1.3em; border-radius: 100px; border: 1.5px solid transparent;
  cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap; line-height: 1;
}
.btn--lg { font-size: 1.02rem; padding: .9em 1.7em; }
.btn--primary { background: var(--grad); color: #fff; box-shadow: var(--shadow-md); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--indigo); color: var(--indigo); transform: translateY(-2px); }
.btn--soon { background: var(--line); color: var(--muted, #6b7280); box-shadow: none; cursor: not-allowed; }
.btn--soon:hover { transform: none; box-shadow: none; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251,251,248,.8);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.nav.is-scrolled { border-color: var(--line); box-shadow: var(--shadow-sm); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 1rem; }
.nav__logo { display: inline-flex; align-items: center; gap: .55rem; }
.logo-word { font-size: 1.4rem; font-weight: 800; letter-spacing: -.03em; display: inline-flex; flex-direction: column; line-height: .92; }
.logo-word--light { color: #fff; }
.logo-word__rev { font-weight: 600; font-size: .4em; letter-spacing: .22em; text-transform: uppercase; opacity: .6; margin-top: .28em; }
.logo-mark { display: inline-flex; }
.nav__links { display: flex; gap: 1.8rem; }
.nav__links a { font-weight: 600; font-size: .95rem; color: var(--ink-soft); position: relative; }
.nav__links a:hover { color: var(--ink); }
.nav__decks, .nav__decks:hover { color: var(--indigo); font-weight: 800; }
.nav__links a::after {
  content: ''; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--grad); transition: width .2s ease; border-radius: 2px;
}
.nav__links a:hover::after { width: 100%; }
.nav__cta { display: flex; gap: .6rem; }
.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__burger span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile {
  display: none; flex-direction: column; gap: .25rem; padding: 1rem 24px 1.5rem;
  background: var(--paper); border-bottom: 1px solid var(--line);
}
.nav__mobile a { padding: .7rem 0; font-weight: 600; color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.nav__mobile a.btn { border: 1.5px solid transparent; margin-top: .6rem; justify-content: center; }
.nav__mobile.is-open { display: flex; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(3rem, 8vw, 6rem) 0 clamp(3rem, 6vw, 5rem); overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(60% 50% at 78% 18%, rgba(109,94,246,.16), transparent 70%),
    radial-gradient(50% 45% at 10% 5%, rgba(67,56,202,.1), transparent 70%);
}
.hero__inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 3rem; align-items: center; }
.hero__sub { margin: 1.4rem 0 2rem; font-size: clamp(1.05rem, 1.6vw, 1.22rem); color: var(--ink-soft); max-width: 54ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.hero__proof { display: flex; align-items: center; gap: 1.4rem; margin-top: 2.6rem; flex-wrap: wrap; }
.hero__proof > div:not(.divider) { display: flex; flex-direction: column; }
.hero__proof strong { font-size: 1.5rem; font-weight: 800; letter-spacing: -.02em; }
.hero__proof span { font-size: .82rem; color: var(--muted); }
.hero__proof .divider { width: 1px; height: 34px; background: var(--line); }

/* Flashcard visual */
.hero__visual { display: flex; justify-content: center; }
.card-stack { position: relative; width: min(380px, 90%); aspect-ratio: 5/4; }
.flash {
  position: absolute; inset: 0; border-radius: var(--r-lg);
  background: var(--white); box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
}
.flash--1 { padding: 1.8rem; display: flex; flex-direction: column; animation: float 6s ease-in-out infinite; }
.flash--2 { transform: rotate(5deg) translateY(14px) scale(.97); background: #F1F0FB; z-index: -1; }
.flash--3 { transform: rotate(-6deg) translateY(26px) scale(.94); background: #E9E7F8; z-index: -2; }
.flash__q { font-family: var(--serif); font-size: 1.3rem; font-weight: 600; color: var(--ink); }
.flash__line { height: 1px; background: var(--line); margin: 1.1rem 0; }
.flash__a { margin-top: auto; }
.pill {
  display: inline-block; background: var(--grad); color: #fff; font-weight: 700;
  padding: .5em 1em; border-radius: 100px; font-size: .95rem;
}
.flash__rate { display: flex; gap: .5rem; margin-top: 1.4rem; }
.rate { flex: 1; text-align: center; font-size: .78rem; font-weight: 700; padding: .5em; border-radius: 8px; }
.rate--again { background: #FEECEC; color: #DC2626; }
.rate--good { background: #E7F8F0; color: #059669; }
.rate--easy { background: #EEF0FE; color: var(--indigo); }

@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

/* ---------- Trust strip ---------- */
.strip { border-block: 1px solid var(--line); background: var(--white); }
.strip__inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding: 1.1rem 24px; flex-wrap: wrap; }
.strip__inner > span { font-size: .85rem; color: var(--muted); font-weight: 600; }
.strip__items { display: flex; gap: 1.6rem; flex-wrap: wrap; }
.strip__items span { font-weight: 800; color: #B9BBC9; letter-spacing: .02em; font-size: 1rem; }

/* ---------- Sections ---------- */
.section { padding: clamp(3.5rem, 8vw, 6.5rem) 0; }
.section--alt { background: var(--white); border-block: 1px solid var(--line); }
.section__head { max-width: 720px; margin: 0 auto 3rem; text-align: center; }
.section__head .lede { margin: 1rem auto 0; }
.section__sub {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 600; letter-spacing: -.01em;
  color: var(--ink-soft); margin-top: .6rem;
}

/* ---------- Science ---------- */
.science-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.sci-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 2rem; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s;
}
.sci-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.sci-card--feature { background: linear-gradient(165deg, #F3F2FE, #FBFBFF); border-color: #DEDAFb; }
.sci-card__icon { color: var(--indigo); margin-bottom: 1rem; line-height: 0; }
.sci-card__icon svg { width: 34px; height: 34px; }
.sci-card h3 { margin-bottom: .5rem; }
.sci-card p { color: var(--ink-soft); font-size: .98rem; }
.sci-card__note { margin-top: .9rem; font-size: .9rem; color: var(--indigo); font-weight: 600; }

/* Curve */
.curve {
  margin-top: 2.5rem; display: grid; grid-template-columns: 1fr 1.1fr; gap: 2.5rem; align-items: center;
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r-xl); padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}
.curve__text h3 { margin-bottom: .7rem; }
.curve__text p { color: var(--ink-soft); }
.curve__legend { list-style: none; margin-top: 1.2rem; display: flex; flex-direction: column; gap: .5rem; }
.curve__legend li { display: flex; align-items: center; gap: .6rem; font-size: .9rem; font-weight: 600; color: var(--ink-soft); }
.dot { width: 14px; height: 14px; border-radius: 50%; display: inline-block; }
.dot--grey { background: #C4C7D4; }
.dot--indigo { background: var(--indigo); }
.curve__chart { width: 100%; }
.js .curve__line { stroke-dasharray: 1400; stroke-dashoffset: 1400; }
.curve.is-visible .curve__line { animation: draw 2.2s ease forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }

.cite { margin-top: 2rem; text-align: center; font-size: .82rem; color: var(--muted); max-width: 70ch; margin-inline: auto; }

/* ---------- Method ---------- */
.method { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; counter-reset: step; }
.method__step {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 2rem; position: relative;
}
.section--alt .method__step { background: var(--paper); }
.method__num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px; background: var(--grad); color: #fff;
  font-weight: 800; font-size: 1.2rem; margin-bottom: 1rem; box-shadow: var(--shadow-md);
}
.method__step h3 { margin-bottom: .5rem; }
.method__step p { color: var(--ink-soft); font-size: .98rem; }
.method__cta { text-align: center; margin-top: 2.6rem; display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.method__cta p { font-weight: 600; color: var(--ink-soft); }

/* ---------- Decks ---------- */
.tabs { display: flex; justify-content: center; gap: .5rem; margin-bottom: 2.4rem; flex-wrap: wrap; }
.tab {
  font-family: var(--font); font-weight: 700; font-size: .92rem; cursor: pointer;
  padding: .55em 1.2em; border-radius: 100px; border: 1.5px solid var(--line);
  background: var(--white); color: var(--ink-soft); transition: .18s;
}
.tab:hover { border-color: var(--indigo); color: var(--indigo); }
.tab.is-active { background: var(--ink); color: #fff; border-color: var(--ink); }

.decks-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.deck {
  display: flex; flex-direction: column; background: var(--white);
  border: 1px solid var(--line); border-radius: var(--r-lg); padding: 1.7rem;
  box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.deck:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #D8D5F5; }
.deck.is-hidden { display: none; }
.deck__top { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .9rem; min-height: 26px; }
.deck__level { font-size: .78rem; font-weight: 700; color: var(--muted); letter-spacing: .02em; text-transform: uppercase; }
.deck__badge { font-size: .72rem; font-weight: 800; color: #fff; background: var(--ink); padding: .3em .7em; border-radius: 100px; letter-spacing: .02em; }
.deck__badge--free { background: var(--green); }
.deck__badge--gold { background: linear-gradient(120deg,#F59E0B,#D97706); }
.deck h3 { margin-bottom: .35rem; }
.deck__meta { font-size: .84rem; color: var(--indigo); font-weight: 700; margin-bottom: .7rem; }
.deck__desc { font-size: .94rem; color: var(--ink-soft); margin-bottom: .9rem; }
.deck__topics { font-size: .78rem; line-height: 1.55; color: var(--muted); margin-bottom: 1.3rem; }
.deck__topics b { color: var(--ink-soft); font-weight: 700; }
.deck__foot { display: flex; align-items: center; justify-content: space-between; gap: .8rem; margin-top: auto; }
.deck__price { font-size: 1.4rem; font-weight: 800; letter-spacing: -.02em; }
.deck--free { border-color: #BBECD6; background: linear-gradient(170deg,#F1FBF6,#FFFFFF); }
.deck--bundle { border-color: #C7C1F0; background: linear-gradient(170deg,#F4F2FE,#FFFFFF); box-shadow: var(--shadow-md); }
.deck--mega { border-color: #F6D99B; background: linear-gradient(170deg,#FFF9EE,#FFFFFF); }
.deck--pop { border: 2px solid var(--indigo-2); background: linear-gradient(170deg,#ECE9FE,#FFFFFF); box-shadow: 0 22px 48px -16px rgba(99,91,246,.55); }
.deck--pop:hover { border-color: var(--indigo); }
.deck__badge--pop { background: var(--grad); }
.deck__save { display: block; margin-top: .2rem; font-size: .72rem; font-weight: 800; color: var(--green); letter-spacing: .02em; }
.decks__note { text-align: center; margin-top: 2rem; font-size: .9rem; color: var(--muted); }
.decks__note a { color: var(--indigo); font-weight: 700; }

/* ---------- Story ---------- */
.section--story { background: var(--ink); color: #EDEEF4; }
.section--story .eyebrow { color: #C7C2FF; background: rgba(140,130,255,.16); }
.section--story h2 { color: #fff; }
.section--story p { color: #BCC0CF; }
.section--story strong { color: #fff; }
.story { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.story__media { display: flex; flex-direction: column; align-items: center; gap: 1.6rem; }
.story__card {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--r-lg); padding: 1.8rem; max-width: 360px;
}
.story__quote { font-family: var(--serif); font-size: 1.15rem; line-height: 1.45; color: #fff; }
.story__cite { display: block; margin-top: 1rem; font-size: .82rem; color: #9aa0b3; font-weight: 600; }
.story__link { display: inline-block; margin-top: 1.3rem; font-weight: 700; font-size: .9rem; color: #C7C2FF; }
.story__link:hover { color: #fff; }
.story__proof { margin: 0; width: 100%; max-width: 340px; }
.story__proof--wide { max-width: 100%; }
.story__proof img { width: 100%; border-radius: var(--r-lg); box-shadow: var(--shadow-md); display: block; }
.story__proof-ph { display: none; aspect-ratio: 3 / 4; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 2rem; border: 2px dashed rgba(255,255,255,.25); border-radius: var(--r-lg); color: rgba(255,255,255,.55); font-size: .95rem; line-height: 1.5; }
.story__proof-ph small { opacity: .7; font-size: .8rem; }
.story__proof figcaption { margin-top: .9rem; text-align: center; font-size: .82rem; color: #9aa0b3; }
a[href*="ankiweb.net"]:not(.btn) { text-decoration: underline; text-underline-offset: 2px; }
.grade-badge {
  width: 220px; height: 220px; border-radius: 50%;
  background: var(--grad); display: flex; flex-direction: column; align-items: center; justify-content: center;
  box-shadow: 0 30px 70px -20px rgba(109,94,246,.6); position: relative;
}
.grade-badge::after {
  content: ''; position: absolute; inset: -10px; border-radius: 50%;
  border: 2px dashed rgba(255,255,255,.25);
}
.grade-badge__num { font-size: 6rem; font-weight: 800; color: #fff; line-height: 1; font-family: var(--serif); }
.grade-badge__x { font-size: 1.5rem; font-weight: 800; color: #fff; opacity: .9; }
.story__copy .btn { margin-top: 1.5rem; }

/* ---------- Reviews ---------- */
.reviews { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.4rem; }
.review { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 1.8rem; }
.section--alt .review { background: var(--paper); }
.review__stars { color: var(--amber); margin-bottom: .8rem; line-height: 0; }
.review__stars svg { width: 22px; height: 22px; }
.review blockquote { font-family: var(--serif); font-size: 1.12rem; line-height: 1.45; color: var(--ink); }
.review figcaption { margin-top: 1rem; font-size: .85rem; color: var(--muted); font-weight: 600; }

/* ---------- Feedback form ---------- */
.feedback-form { max-width: 560px; margin: 2rem auto 0; display: flex; flex-direction: column; gap: .8rem; text-align: left; }
.feedback-form input, .feedback-form select, .feedback-form textarea {
  width: 100%; padding: .85em 1.1em; border-radius: var(--r-md); border: 1px solid var(--line);
  font-family: var(--font); font-size: 1rem; color: var(--ink); background: var(--white); outline: none;
}
.feedback-form input:focus, .feedback-form select:focus, .feedback-form textarea:focus {
  border-color: var(--indigo); box-shadow: 0 0 0 3px rgba(99,91,246,.12);
}
.feedback-form textarea { min-height: 130px; resize: vertical; }
.feedback-form__row { display: flex; gap: .8rem; }
.feedback-form__row > * { flex: 1; }
.feedback-form .btn { align-self: center; margin-top: .4rem; }
.feedback-fine { text-align: center; font-size: .82rem; color: var(--muted); margin-top: 1rem; }
@media (max-width: 560px) { .feedback-form__row { flex-direction: column; } }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: .8rem; }
.faq details {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 0 1.4rem; box-shadow: var(--shadow-sm); overflow: hidden;
}
.faq summary {
  list-style: none; cursor: pointer; font-weight: 700; padding: 1.2rem 0;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 1.5rem; font-weight: 400; color: var(--indigo); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--ink-soft); margin: -.3rem 0 .8rem; }
.faq details ul { margin: 0 0 .9rem; padding-left: 1.15rem; color: var(--ink-soft); display: flex; flex-direction: column; gap: .5rem; }
.faq details li { line-height: 1.55; }
.faq details li b { color: var(--ink); }
.faq details > :last-child { margin-bottom: 1.3rem; }

/* ---------- Footer ---------- */
.footer { background: var(--ink); color: #AEB2C2; padding: 3.5rem 0 2rem; }
.footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; padding-bottom: 2.5rem; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer__brand p { margin-top: 1rem; max-width: 34ch; font-size: .92rem; }
.footer__col h4 { color: #fff; font-size: .9rem; margin-bottom: 1rem; letter-spacing: .02em; }
.footer__col a { display: block; padding: .35rem 0; font-size: .92rem; transition: color .15s; }
.footer__col a:hover { color: #fff; }
.footer__base { display: flex; justify-content: space-between; gap: 1rem; padding-top: 1.5rem; font-size: .8rem; color: #797E92; flex-wrap: wrap; }
.footer__base a { color: #EDEEF4; font-weight: 700; font-size: .95rem; text-decoration: underline; text-underline-offset: 3px; }
.footer__base a:hover { color: #fff; }
.decks__cta { text-align: center; margin-top: 2.4rem; }

/* ---------- Subpage / results ---------- */
.subhero { padding: clamp(2.5rem,6vw,4rem) 0 1rem; text-align: center; }
.subhero .eyebrow { margin-bottom: .8rem; }
.proof-figure { margin: 0 auto; max-width: 720px; }
.proof-figure img { width: 100%; border-radius: var(--r-lg); border: 1px solid var(--line); box-shadow: var(--shadow-md); }
.proof-ph {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 320px; border: 2px dashed #CFCBF2; border-radius: var(--r-lg);
  background: linear-gradient(170deg,#F6F5FE,#fff); color: var(--muted); padding: 2rem;
  font-weight: 600;
}
.proof-figure figcaption { margin-top: 1rem; text-align: center; font-size: .88rem; color: var(--muted); }
.proof-points { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.2rem; margin-top: 3rem; }
.proof-point { background: var(--white); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 1.6rem; text-align: center; box-shadow: var(--shadow-sm); }
.proof-point strong { display: block; font-size: 1.8rem; letter-spacing: -.02em; }
.proof-point span { font-size: .9rem; color: var(--muted); }
.backlink { display: inline-flex; align-items: center; gap: .4rem; font-weight: 700; color: var(--indigo); margin-top: 2.5rem; }
@media (max-width: 720px){ .proof-points { grid-template-columns: 1fr; } }

/* ---------- Reveal animation ---------- */
.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .hero__inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero__visual { order: -1; }
  .card-stack { width: min(320px, 80%); }
  .science-grid, .method, .reviews { grid-template-columns: 1fr; }
  .decks-grid { grid-template-columns: repeat(2, 1fr); }
  .curve { grid-template-columns: 1fr; padding: 1.8rem; }
  .story { grid-template-columns: 1fr; text-align: center; }
  .story__copy .btn { margin-inline: auto; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .container { padding: 0 18px; }
  .decks-grid { grid-template-columns: 1fr; }
  .hero__proof { gap: 1rem; }
  .hero__proof .divider { display: none; }
  .signup { flex-direction: column; }
  .signup input, .signup .btn { width: 100%; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__base { flex-direction: column; }
  .grade-badge { width: 170px; height: 170px; }
  .grade-badge__num { font-size: 4.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .curve__line { stroke-dashoffset: 0; }
}