@charset "UTF-8";

/* 回声 ECHO · landing page */

.landing-page {
  overflow-x: clip;
}

.landing-header {
  position: fixed;
  z-index: 9000;
  top: 18px;
  right: 0;
  left: 0;
  pointer-events: none;
  transition: top 280ms var(--ease-out);
}

.landing-header .container {
  position: relative;
}

.landing-nav {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  padding: 10px 12px 10px 18px;
  border-radius: 999px;
  pointer-events: auto;
  transition:
    background-color 280ms ease,
    box-shadow 280ms ease,
    border-color 280ms ease;
}

.landing-header.is-scrolled {
  top: 10px;
}

.landing-header.is-scrolled .landing-nav {
  border-color: rgba(255, 255, 255, 0.84);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.47)),
    rgba(255, 255, 255, 0.4);
  box-shadow:
    inset 0 1px 0 #fff,
    0 18px 55px rgba(46, 47, 69, 0.12);
}

.landing-nav .brand {
  padding-left: 2px;
}

.landing-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.2vw, 32px);
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.landing-nav__links a {
  position: relative;
  padding: 8px 0;
  transition: color 180ms ease;
}

.landing-nav__links a::after {
  position: absolute;
  right: 0;
  bottom: 3px;
  left: 0;
  height: 1px;
  background: var(--ink);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 260ms var(--ease-out);
}

.landing-nav__links a:hover {
  color: var(--ink);
}

.landing-nav__links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.landing-nav__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-login {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  transition: color 180ms ease;
}

.nav-login:hover {
  color: var(--ink);
}

.nav-create {
  min-height: 42px;
  padding: 10px 17px;
  font-size: 12px;
}

.nav-menu-button {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.38);
  color: var(--ink);
  place-items: center;
}

.mobile-nav {
  position: absolute;
  z-index: 3;
  top: calc(100% + 10px);
  right: var(--page-x);
  left: var(--page-x);
  padding: 20px;
  border-radius: 26px;
  pointer-events: auto;
  animation: mobile-nav-in 260ms var(--ease-out) both;
}

.mobile-nav-scrim {
  position: fixed;
  inset: 0;
  border: 0;
  background: rgba(24, 25, 36, 0.16);
  cursor: default;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  animation: mobile-nav-scrim-in 180ms ease both;
}

.mobile-nav nav {
  display: grid;
  gap: 2px;
}

.mobile-nav nav a {
  padding: 12px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14px;
}

.mobile-nav__actions {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 8px;
  margin-top: 16px;
}

@keyframes mobile-nav-in {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.99);
  }
}

@keyframes mobile-nav-scrim-in {
  from {
    opacity: 0;
  }
}

.hero {
  position: relative;
  min-height: 100svh;
  padding: clamp(150px, 14vw, 190px) 0 0;
}

.hero__halo {
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(20px);
  opacity: 0.55;
  pointer-events: none;
}

.hero__halo--one {
  top: 10%;
  right: 2%;
  width: 37vw;
  height: 37vw;
  background: radial-gradient(circle, rgba(152, 188, 239, 0.36), transparent 66%);
}

.hero__halo--two {
  bottom: 4%;
  left: -12%;
  width: 34vw;
  height: 34vw;
  background: radial-gradient(circle, rgba(235, 171, 148, 0.34), transparent 68%);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(470px, 0.98fr);
  align-items: center;
  gap: clamp(30px, 5vw, 74px);
}

.hero__copy {
  position: relative;
  z-index: 3;
  padding-bottom: 54px;
}

.hero__title {
  max-width: 650px;
  margin-top: 27px;
  font-size: clamp(58px, 6.1vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.065em;
}

.hero__title span {
  position: relative;
  display: inline-block;
  color: var(--accent-deep);
}

.hero__title span::after {
  position: absolute;
  right: 0;
  bottom: 0.05em;
  left: 0.1em;
  height: 1px;
  background: linear-gradient(90deg, rgba(91, 74, 210, 0.02), rgba(91, 74, 210, 0.32), transparent);
  content: "";
}

.hero__lead {
  max-width: 510px;
  margin-top: 31px;
  color: var(--muted);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.9;
  letter-spacing: 0.01em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 34px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  margin-top: 27px;
  color: var(--muted-soft);
  font-size: 11px;
}

.hero__meta > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero__visual {
  --tilt-x: 0deg;
  --tilt-y: 0deg;
  position: relative;
  min-height: 630px;
  transform: perspective(1200px) rotateX(var(--tilt-x)) rotateY(var(--tilt-y));
  transform-style: preserve-3d;
  transition: transform 450ms var(--ease-out);
}

.hero__rings {
  position: absolute;
  top: 50%;
  left: 52%;
  width: min(42vw, 620px);
  height: min(42vw, 620px);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero__rings span {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  box-shadow: inset 0 0 50px rgba(255, 255, 255, 0.08);
}

.hero__rings span:nth-child(1) {
  inset: 0;
  animation: slow-spin 38s linear infinite;
}

.hero__rings span:nth-child(2) {
  inset: 9%;
  border-color: rgba(255, 255, 255, 0.4);
  background: radial-gradient(circle at 30% 22%, rgba(255, 255, 255, 0.22), transparent 38%);
  animation: slow-spin 28s linear infinite reverse;
}

.hero__rings span:nth-child(3) {
  inset: 21%;
  border-color: rgba(255, 255, 255, 0.3);
}

.hero__rings span:nth-child(4) {
  top: 5%;
  left: 25%;
  width: 9px;
  height: 9px;
  border: 0;
  background: rgba(255, 255, 255, 0.92);
  box-shadow:
    0 0 0 6px rgba(255, 255, 255, 0.2),
    0 0 24px rgba(123, 108, 240, 0.55);
}

@keyframes slow-spin {
  to {
    transform: rotate(360deg);
  }
}

.board-preview {
  position: absolute;
  z-index: 3;
  top: 48%;
  left: 48%;
  width: min(470px, calc(100% - 70px));
  overflow: hidden;
  border-radius: 34px;
  transform: translate(-50%, -50%) rotate(-1.4deg);
  animation: board-float 7s ease-in-out infinite;
}

.board-preview::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 38%;
  background: radial-gradient(ellipse at 70% 0%, rgba(255, 255, 255, 0.62), transparent 66%);
  content: "";
  pointer-events: none;
}

.board-preview__head {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 23px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.55);
}

.user-line {
  display: flex;
  align-items: center;
  gap: 11px;
}

.user-line__copy {
  display: grid;
  gap: 1px;
}

.user-line__copy strong {
  font-size: 13px;
  font-weight: 650;
}

.user-line__copy small {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 9px;
}

.board-preview__status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 10px;
}

.board-preview__body {
  position: relative;
  padding: 28px 26px 24px;
}

.board-preview__kicker {
  color: var(--accent-deep);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.13em;
}

.board-preview h2 {
  margin-top: 12px;
  font-size: 37px;
  font-weight: 500;
  letter-spacing: -0.04em;
}

.board-preview__intro {
  margin-top: 13px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}

.board-preview__question {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  margin-top: 27px;
  padding: 17px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.35);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

.board-preview__number {
  display: grid;
  width: 28px;
  height: 28px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  color: var(--accent-deep);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  place-items: center;
}

.board-preview__question small {
  color: var(--muted-soft);
  font-size: 9px;
}

.board-preview__question p {
  margin-top: 2px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.45;
}

.board-preview__input {
  display: block;
  grid-column: 2;
  margin-top: 7px;
  padding: 9px 11px;
  border: 1px solid rgba(31, 33, 48, 0.08);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.34);
  color: #9a9ca9;
  font-size: 9px;
}

.board-preview__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 20px;
  color: var(--muted-soft);
  font-size: 9px;
}

.board-preview__foot .btn {
  min-height: 35px;
  padding: 8px 13px;
  font-size: 9px;
}

@keyframes board-float {
  0%,
  100% {
    transform: translate(-50%, -50%) rotate(-1.4deg) translateY(0);
  }
  50% {
    transform: translate(-50%, -50%) rotate(-0.8deg) translateY(-9px);
  }
}

.float-card {
  position: absolute;
  z-index: 4;
  display: grid;
  border-radius: 20px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.84), rgba(255, 255, 255, 0.5)),
    rgba(255, 255, 255, 0.4);
  box-shadow:
    inset 0 1px 0 #fff,
    0 22px 60px rgba(43, 44, 66, 0.14);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  backdrop-filter: blur(24px) saturate(140%);
}

.float-card--message {
  right: -9px;
  bottom: 44px;
  width: 225px;
  padding: 18px 18px 16px;
  transform: rotate(2.5deg);
  animation: float-soft 6s ease-in-out infinite 0.5s;
}

.float-card__mark {
  position: absolute;
  top: 9px;
  right: 15px;
  color: color-mix(in srgb, var(--accent) 28%, transparent);
  font-family: var(--font-display);
  font-size: 42px;
  line-height: 1;
}

.float-card--message p {
  position: relative;
  padding-right: 10px;
  font-family: var(--font-display);
  font-size: 14px;
  line-height: 1.7;
}

.float-card__from {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 15px;
  color: var(--muted);
  font-size: 9px;
}

.float-card--stat {
  top: 68px;
  left: -14px;
  width: 150px;
  padding: 16px;
  transform: rotate(-3deg);
  animation: float-soft 7s ease-in-out infinite 1.2s;
}

.float-card__stat-kicker {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 7px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.float-card--stat strong {
  margin-top: 7px;
  font-family: var(--font-display);
  font-size: 35px;
  font-weight: 500;
  line-height: 1;
}

.float-card--stat > span:not(.float-card__stat-kicker, .float-card__spark) {
  margin-top: 3px;
  color: var(--muted);
  font-size: 9px;
}

.float-card__spark {
  display: flex;
  height: 31px;
  align-items: flex-end;
  gap: 4px;
  margin-top: 12px;
}

.float-card__spark i {
  width: 100%;
  height: var(--h);
  border-radius: 3px 3px 1px 1px;
  background: linear-gradient(180deg, rgba(121, 104, 240, 0.66), rgba(121, 104, 240, 0.14));
}

.hero__caption {
  position: absolute;
  right: 10px;
  bottom: 2px;
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 7px;
  letter-spacing: 0.13em;
}

.hero__ticker {
  position: relative;
  width: 100%;
  margin-top: clamp(50px, 8vw, 100px);
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.58);
  border-bottom: 1px solid rgba(255, 255, 255, 0.58);
  background: rgba(255, 255, 255, 0.2);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.hero__ticker-track {
  display: flex;
  width: max-content;
  align-items: center;
  gap: 30px;
  padding: 16px 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.11em;
  white-space: nowrap;
  animation: ticker 42s linear infinite;
}

.hero__ticker-track i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-deep);
  opacity: 0.5;
}

@keyframes ticker {
  to {
    transform: translateX(-50%);
  }
}

.section {
  padding: clamp(96px, 11vw, 164px) 0;
}

.idea {
  position: relative;
}

.idea::before {
  position: absolute;
  top: 20%;
  left: -12%;
  width: 38vw;
  height: 38vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(189, 220, 209, 0.26), transparent 67%);
  content: "";
  filter: blur(20px);
  pointer-events: none;
}

.idea__grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(50px, 9vw, 130px);
}

.idea__intro {
  position: sticky;
  top: 140px;
  height: fit-content;
}

.idea__title {
  margin-top: 25px;
  font-size: clamp(48px, 5.2vw, 76px);
  line-height: 1.04;
}

.idea__title span {
  color: var(--accent-deep);
}

.idea__aside {
  margin-top: 58px;
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.1em;
}

.idea__content {
  padding-top: 11px;
}

.idea__statement {
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.55;
  letter-spacing: -0.03em;
}

.idea__statement span {
  position: relative;
  display: inline-block;
  color: var(--accent-deep);
}

.idea__statement span::after {
  position: absolute;
  right: -4px;
  bottom: 3px;
  left: -4px;
  height: 8px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  content: "";
  transform: rotate(-1deg);
}

.idea__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 54px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  line-height: 2;
}

.idea__principles {
  display: grid;
  gap: 0;
  margin-top: 48px;
}

.idea__principles article {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 15px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.idea__principles article > span {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 9px;
}

.idea__principles h3 {
  font-size: 15px;
  font-weight: 600;
}

.idea__principles p {
  max-width: 390px;
  margin-top: 7px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 60px;
  margin-bottom: clamp(45px, 6vw, 74px);
}

.section-head__title {
  margin-top: 22px;
  font-size: clamp(48px, 5.7vw, 82px);
  line-height: 1.02;
}

.section-head__title span {
  color: var(--accent-deep);
}

.section-head__lead {
  max-width: 390px;
  padding-bottom: 7px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.feature-card--wide {
  grid-column: span 7;
  min-height: 548px;
  padding: 27px;
}

.feature-card--accent {
  display: flex;
  grid-column: span 5;
  min-height: 548px;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background:
    radial-gradient(circle at 75% 20%, color-mix(in srgb, var(--accent) 52%, transparent), transparent 33%),
    radial-gradient(circle at 14% 95%, rgba(238, 165, 139, 0.32), transparent 40%),
    linear-gradient(155deg, #27283a, #1c1d29);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 30px 80px rgba(30, 31, 45, 0.22);
  color: #fff;
}

.feature-card--light {
  display: grid;
  grid-column: span 12;
  min-height: 380px;
  grid-template-columns: 0.9fr 1.1fr;
  grid-template-rows: auto 1fr;
  gap: 20px 60px;
  padding: 30px;
}

.feature-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.feature-card__icon {
  display: grid;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.38);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.85);
  color: var(--accent-deep);
  place-items: center;
}

.feature-card__index {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.13em;
}

.feature-card--accent .feature-card__index {
  color: rgba(255, 255, 255, 0.45);
}

.feature-card__copy {
  position: relative;
  z-index: 2;
  max-width: 380px;
  margin-top: 48px;
}

.feature-card__copy h3 {
  font-family: var(--font-display);
  font-size: clamp(30px, 2.5vw, 39px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.feature-card__copy p {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.9;
}

.feature-card--accent .feature-card__copy {
  margin-top: 25px;
}

.feature-card--accent .feature-card__copy p {
  color: rgba(255, 255, 255, 0.62);
}

.feature-card--accent .feature-card__copy h3 {
  font-size: clamp(32px, 2.9vw, 45px);
}

.question-stack {
  position: absolute;
  right: 28px;
  bottom: 26px;
  left: 28px;
  display: grid;
  gap: 8px;
}

.question-chip {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 10px;
  min-height: 57px;
  padding: 10px 13px;
  border: 1px solid rgba(255, 255, 255, 0.63);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.29);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.64);
}

.question-chip:nth-child(2) {
  margin-right: 20px;
  margin-left: 20px;
}

.question-chip:nth-child(3) {
  margin-right: 40px;
  margin-left: 40px;
}

.question-chip > span {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 8px;
}

.question-chip p {
  font-size: 11px;
  line-height: 1.45;
}

.question-chip__type {
  padding: 4px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted-soft);
  font-size: 8px;
  font-style: normal;
  white-space: nowrap;
}

.share-orbit {
  position: relative;
  display: grid;
  width: 240px;
  height: 240px;
  margin: 8px auto 0;
  place-items: center;
}

.share-orbit__ring {
  position: absolute;
  inset: 11px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  animation: slow-spin 30s linear infinite;
}

.share-orbit__ring--two {
  inset: 43px;
  border-style: dashed;
  opacity: 0.55;
  animation-direction: reverse;
}

.share-orbit__core {
  position: relative;
  display: grid;
  width: 78px;
  height: 78px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 28%, rgba(255, 255, 255, 0.4), transparent 35%),
    rgba(255, 255, 255, 0.12);
  box-shadow:
    inset 0 0 32px rgba(255, 255, 255, 0.1),
    0 0 70px color-mix(in srgb, var(--accent) 60%, transparent);
  color: #fff;
  place-items: center;
}

.share-orbit__dot {
  position: absolute;
  width: 9px;
  height: 9px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.55);
}

.share-orbit__dot--a {
  top: 26px;
  left: 52px;
}

.share-orbit__dot--b {
  right: 30px;
  bottom: 70px;
  width: 6px;
  height: 6px;
  opacity: 0.6;
}

.share-orbit__dot--c {
  bottom: 28px;
  left: 83px;
  width: 5px;
  height: 5px;
  opacity: 0.45;
}

.mini-inbox {
  display: grid;
  align-content: end;
  gap: 7px;
  min-height: 180px;
}

.mini-inbox__row {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.28);
}

.mini-inbox__row:nth-child(2) {
  margin-right: 30px;
}

.mini-inbox__row > div {
  display: grid;
  flex: 1;
  gap: 1px;
  min-width: 0;
}

.mini-inbox__row strong {
  font-size: 10px;
  font-weight: 600;
}

.mini-inbox__row div span {
  overflow: hidden;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.5;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-inbox__row .badge {
  min-height: 20px;
  padding: 3px 7px;
  font-size: 7px;
}

.preview {
  padding-top: 20px;
}

.preview__shell {
  position: relative;
  display: grid;
  min-height: 730px;
  grid-template-columns: 0.8fr 1.2fr;
  align-items: center;
  gap: clamp(40px, 7vw, 100px);
  overflow: hidden;
  padding: clamp(38px, 6vw, 84px);
  border-radius: 44px;
}

.preview__shell::before {
  position: absolute;
  top: -20%;
  left: -10%;
  width: 55%;
  height: 80%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(243, 186, 161, 0.26), transparent 68%);
  content: "";
  pointer-events: none;
}

.preview__intro {
  position: relative;
  z-index: 2;
}

.preview__title {
  margin-top: 22px;
  font-size: clamp(46px, 4.8vw, 69px);
  line-height: 1.06;
}

.preview__title span {
  color: var(--accent-deep);
}

.preview__intro > p:not(.eyebrow) {
  max-width: 380px;
  margin-top: 25px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.95;
}

.preview__intro > .btn {
  margin-top: 30px;
}

.preview__note {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 18px;
  color: var(--muted-soft);
  font-size: 10px;
}

.preview__stage {
  position: relative;
  display: flex;
  min-height: 580px;
  align-items: center;
  justify-content: center;
}

.preview__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 84%;
  height: 82%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, rgba(163, 193, 238, 0.44), transparent 45%),
    radial-gradient(circle at 70% 65%, rgba(238, 175, 149, 0.34), transparent 46%);
  filter: blur(36px);
  transform: translate(-50%, -50%);
}

.preview-page {
  position: relative;
  z-index: 2;
  width: min(440px, 92%);
  overflow: hidden;
  padding: 25px;
  border: 1px solid rgba(255, 255, 255, 0.84);
  border-radius: 32px;
  background:
    linear-gradient(155deg, rgba(255, 255, 255, 0.84), rgba(249, 249, 253, 0.53)),
    rgba(255, 255, 255, 0.45);
  box-shadow:
    inset 0 1px 0 #fff,
    0 32px 90px rgba(46, 47, 69, 0.16);
  transform: rotate(1deg);
}

.preview-page__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.preview-page__eyebrow,
.preview-page__live {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.11em;
}

.preview-page__live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.preview-page__profile {
  display: flex;
  align-items: center;
  gap: 17px;
  margin-top: 30px;
}

.preview-page__profile > div {
  min-width: 0;
}

.preview-page__profile p {
  color: var(--muted-soft);
  font-size: 9px;
}

.preview-page__profile h3 {
  margin-top: 4px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.3;
}

.preview-page__profile div > span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 9px;
}

.preview-page__meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 24px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.69);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.23);
}

.preview-page__meta span {
  padding: 12px 10px;
  border-right: 1px solid rgba(255, 255, 255, 0.58);
  color: var(--muted);
  font-size: 8px;
  text-align: center;
}

.preview-page__meta span:last-child {
  border-right: 0;
}

.preview-page__meta strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
}

.preview-page__echoes {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.preview-echo {
  display: grid;
  gap: 8px;
  padding: 14px 15px;
  border: 1px solid rgba(255, 255, 255, 0.66);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.28);
}

.preview-echo__head {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted-soft);
  font-size: 8px;
}

.preview-echo__head strong {
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 600;
}

.preview-echo p {
  color: var(--ink-soft);
  font-family: var(--font-display);
  font-size: 12px;
  line-height: 1.75;
}

.preview-echo__reply {
  padding: 8px 10px;
  border-left: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  color: var(--muted);
  font-size: 8px;
  line-height: 1.6;
}

.preview__floating-tag {
  position: absolute;
  z-index: 3;
  right: -5px;
  bottom: 62px;
  display: flex;
  max-width: 230px;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px 8px;
  padding: 13px 15px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.61);
  box-shadow:
    inset 0 1px 0 #fff,
    0 18px 45px rgba(46, 47, 69, 0.14);
  color: var(--accent-deep);
  font-size: 8px;
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  transform: rotate(-2deg);
}

.preview__floating-tag strong {
  color: var(--ink);
  font-size: 9px;
}

.preview__floating-tag > span:last-child {
  width: 100%;
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 11px;
}

.steps {
  padding-top: 20px;
}

.steps__head {
  display: grid;
  justify-items: center;
  margin-bottom: 50px;
  text-align: center;
}

.steps__head h2 {
  margin-top: 22px;
  font-size: clamp(45px, 5vw, 72px);
  line-height: 1.06;
}

.steps__head h2 span {
  color: var(--accent-deep);
}

.steps__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.step-card {
  position: relative;
  min-height: 340px;
  overflow: hidden;
  padding: 25px;
  border-radius: 28px;
}

.step-card__number {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.12em;
}

.step-card__line {
  position: absolute;
  top: 32px;
  right: 0;
  left: 55px;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

.step-card__icon {
  display: grid;
  width: 49px;
  height: 49px;
  margin-top: 55px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 12px 30px rgba(46, 47, 69, 0.08);
  color: var(--accent-deep);
  place-items: center;
}

.step-card h3 {
  margin-top: 24px;
  font-family: var(--font-display);
  font-size: 27px;
  font-weight: 500;
}

.step-card p {
  margin-top: 11px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.85;
}

.step-card__meta {
  position: absolute;
  right: 25px;
  bottom: 22px;
  left: 25px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 7px;
  letter-spacing: 0.12em;
}

.trust {
  padding-top: 25px;
}

.trust__grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 17px;
}

.trust-card {
  position: relative;
  min-height: 535px;
  overflow: hidden;
  border-radius: 34px;
}

.trust-card--main {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px;
}

.trust-card__index {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.trust-card--main .trust-card__copy {
  max-width: 470px;
  margin-top: 60px;
}

.trust-card h2 {
  font-size: clamp(38px, 4vw, 58px);
  line-height: 1.07;
}

.trust-card--main p {
  margin-top: 21px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
}

.trust-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 22px;
  margin-top: 42px;
  padding-top: 25px;
  border-top: 1px solid var(--line);
}

.trust-list li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.6;
}

.trust-list .icon {
  margin-top: 1px;
  color: var(--success);
}

.trust-card--privacy {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  background:
    radial-gradient(circle at 77% 16%, rgba(230, 165, 142, 0.42), transparent 31%),
    linear-gradient(150deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.36));
  box-shadow:
    inset 0 1px 0 #fff,
    var(--shadow-card);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
}

.trust-card--privacy .trust-card__index {
  position: absolute;
  top: 32px;
  left: 32px;
}

.privacy-orbit {
  position: absolute;
  top: 28px;
  right: 28px;
  display: grid;
  width: 150px;
  height: 150px;
  place-items: center;
}

.privacy-orbit > span:not(.privacy-orbit__core) {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
}

.privacy-orbit > span:nth-child(1) {
  inset: 0;
}

.privacy-orbit > span:nth-child(2) {
  inset: 23px;
  border-style: dashed;
  opacity: 0.7;
  animation: slow-spin 30s linear infinite;
}

.privacy-orbit__core {
  display: grid;
  width: 58px;
  height: 58px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.44);
  box-shadow:
    inset 0 1px 0 #fff,
    0 14px 40px rgba(154, 100, 82, 0.15);
  color: #9a5d4b;
  place-items: center;
}

.trust-card--privacy h2 {
  max-width: 380px;
  font-size: clamp(35px, 3.6vw, 51px);
}

.trust-card--privacy > p {
  margin-top: 19px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.9;
}

.privacy-demo {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-top: 23px;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 13px;
  background: rgba(28, 29, 41, 0.91);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  color: #fff;
}

.privacy-demo span {
  color: rgba(255, 255, 255, 0.48);
  font-size: 8px;
}

.privacy-demo strong {
  font-size: 11px;
  font-weight: 500;
}

.privacy-demo i {
  margin-left: auto;
  color: rgba(255, 255, 255, 0.4);
  font-size: 8px;
  font-style: normal;
}

.trust-card--privacy > small {
  margin-top: 12px;
  color: var(--muted-soft);
  font-size: 9px;
}

.closing {
  padding: clamp(80px, 10vw, 140px) 0 clamp(76px, 9vw, 120px);
}

.closing__panel {
  position: relative;
  display: flex;
  min-height: 590px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 70px 30px;
  border-color: rgba(255, 255, 255, 0.18);
  border-radius: 42px;
  background:
    radial-gradient(circle at 14% 0%, rgba(121, 104, 240, 0.36), transparent 34%),
    radial-gradient(circle at 88% 100%, rgba(233, 162, 139, 0.24), transparent 40%),
    linear-gradient(150deg, rgba(38, 39, 56, 0.96), rgba(23, 24, 34, 0.97));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    0 40px 110px rgba(31, 32, 46, 0.25);
  color: #fff;
  text-align: center;
  -webkit-backdrop-filter: blur(30px);
  backdrop-filter: blur(30px);
}

.closing__panel .eyebrow {
  position: relative;
  z-index: 2;
  color: rgba(255, 255, 255, 0.47);
}

.closing__panel h2 {
  position: relative;
  z-index: 2;
  margin-top: 24px;
  font-size: clamp(48px, 6vw, 84px);
  line-height: 1.02;
}

.closing__panel h2 span {
  color: #cfc9ff;
}

.closing__panel > p:not(.eyebrow) {
  position: relative;
  z-index: 2;
  margin-top: 22px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
}

.closing__actions {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 31px;
}

.closing__panel .btn--primary {
  background: #fff;
  color: var(--ink);
}

.closing__panel .btn--glass {
  border-color: rgba(255, 255, 255, 0.17);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
  color: #fff;
}

.closing__meta {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 22px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.35);
  font-size: 9px;
}

.closing__rings {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 900px;
  height: 900px;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.closing__rings span {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.055);
  border-radius: 50%;
}

.closing__rings span:nth-child(1) {
  inset: 0;
}

.closing__rings span:nth-child(2) {
  inset: 16%;
  border-color: rgba(255, 255, 255, 0.08);
}

.closing__rings span:nth-child(3) {
  inset: 32%;
  border-color: rgba(255, 255, 255, 0.1);
}

@media (max-width: 1120px) {
  .landing-nav__links {
    gap: 18px;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(430px, 0.92fr);
    gap: 24px;
  }

  .hero__visual {
    min-height: 570px;
  }

  .board-preview {
    width: min(430px, calc(100% - 42px));
  }

  .float-card--message {
    right: -4px;
    bottom: 21px;
  }

  .float-card--stat {
    top: 42px;
  }

  .preview__shell {
    gap: 50px;
    padding: 52px;
  }
}

@media (max-width: 960px) {
  .landing-nav__links,
  .nav-login {
    display: none;
  }

  .nav-menu-button {
    display: grid;
  }

  .hero {
    padding-top: 142px;
  }

  .hero__grid {
    grid-template-columns: 1fr;
  }

  .hero__copy {
    max-width: 720px;
    padding-bottom: 0;
  }

  .hero__title {
    font-size: clamp(58px, 9.5vw, 86px);
  }

  .hero__visual {
    width: min(680px, 100%);
    min-height: 600px;
    margin: 0 auto;
  }

  .hero__rings {
    width: 600px;
    height: 600px;
  }

  .idea__grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .idea__intro {
    position: static;
  }

  .idea__aside {
    display: none;
  }

  .feature-card--wide,
  .feature-card--accent {
    grid-column: span 12;
  }

  .feature-card--accent {
    min-height: 580px;
  }

  .preview__shell {
    grid-template-columns: 1fr;
  }

  .preview__intro {
    max-width: 580px;
  }

  .preview__stage {
    min-height: 600px;
  }

  .steps__grid {
    grid-template-columns: 1fr;
  }

  .step-card {
    min-height: 280px;
  }

  .step-card__icon {
    margin-top: 35px;
  }

  .trust__grid {
    grid-template-columns: 1fr;
  }

  .trust-card {
    min-height: 500px;
  }
}

@media (max-width: 720px) {
  .landing-header {
    top: 10px;
  }

  .landing-nav {
    min-height: 58px;
    gap: 10px;
    padding: 8px 8px 8px 14px;
  }

  .landing-nav .brand-copy strong {
    font-size: 18px;
  }

  .landing-nav .brand-copy small {
    display: none;
  }

  .landing-nav .brand-symbol {
    width: 32px;
    height: 32px;
  }

  .nav-create {
    display: none;
  }

  .hero {
    padding-top: 126px;
  }

  .hero__title {
    margin-top: 21px;
    font-size: clamp(45px, 12.3vw, 67px);
    line-height: 1.04;
  }

  .hero__lead {
    margin-top: 23px;
    font-size: 14px;
    line-height: 1.85;
  }

  .hero__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .hero__meta {
    gap: 8px 15px;
  }

  .hero__visual {
    min-height: 530px;
    margin-top: 20px;
  }

  .hero__rings {
    width: 440px;
    height: 440px;
  }

  .board-preview {
    top: 46%;
    width: calc(100% - 4px);
    border-radius: 26px;
  }

  .board-preview__head {
    padding: 16px 17px;
  }

  .board-preview__body {
    padding: 22px 18px 18px;
  }

  .board-preview h2 {
    font-size: 31px;
  }

  .board-preview__intro {
    font-size: 11px;
  }

  .board-preview__question {
    padding: 14px;
  }

  .board-preview__foot {
    align-items: flex-start;
    flex-direction: column;
  }

  .float-card--message {
    right: 3px;
    bottom: -16px;
    width: 180px;
    padding: 15px;
  }

  .float-card--message p {
    font-size: 12px;
  }

  .float-card--stat {
    top: 18px;
    left: 2px;
    width: 118px;
    padding: 12px;
  }

  .float-card--stat strong {
    font-size: 27px;
  }

  .float-card__spark {
    height: 22px;
    margin-top: 8px;
  }

  .hero__caption {
    display: none;
  }

  .hero__ticker {
    margin-top: 63px;
  }

  .section {
    padding: 92px 0;
  }

  .idea__title {
    font-size: 48px;
  }

  .idea__statement {
    font-size: 28px;
    line-height: 1.6;
  }

  .idea__body {
    grid-template-columns: 1fr;
    gap: 17px;
    margin-top: 38px;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 24px;
  }

  .section-head__title {
    font-size: 48px;
  }

  .feature-card--wide,
  .feature-card--accent,
  .feature-card--light {
    display: block;
    min-height: 520px;
    padding: 23px;
  }

  .feature-card--light {
    min-height: 560px;
  }

  .feature-card__copy {
    margin-top: 38px;
  }

  .question-stack {
    right: 18px;
    bottom: 20px;
    left: 18px;
  }

  .question-chip:nth-child(2),
  .question-chip:nth-child(3) {
    margin-right: 0;
    margin-left: 0;
  }

  .share-orbit {
    width: 200px;
    height: 200px;
    margin-top: 16px;
  }

  .feature-card--accent {
    min-height: 540px;
  }

  .mini-inbox {
    min-height: 0;
    margin-top: 38px;
  }

  .mini-inbox__row:nth-child(2) {
    margin-right: 0;
  }

  .preview {
    padding-top: 0;
  }

  .preview__shell {
    gap: 36px;
    padding: 32px 20px 26px;
    border-radius: 30px;
  }

  .preview__intro {
    padding: 0 4px;
  }

  .preview__title {
    font-size: 45px;
  }

  .preview__stage {
    min-height: 520px;
  }

  .preview-page {
    width: 100%;
    padding: 19px;
    border-radius: 25px;
  }

  .preview-page__profile {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .preview-page__profile .avatar {
    width: 60px;
    height: 60px;
    font-size: 22px;
  }

  .preview__floating-tag {
    right: 5px;
    bottom: 22px;
  }

  .steps__grid {
    gap: 12px;
  }

  .step-card {
    min-height: 295px;
    padding: 22px;
  }

  .trust-card {
    min-height: 550px;
    padding: 25px;
    border-radius: 28px;
  }

  .trust-card--privacy .trust-card__index {
    top: 25px;
    left: 25px;
  }

  .trust-list {
    grid-template-columns: 1fr;
  }

  .privacy-orbit {
    top: 22px;
    right: 22px;
    width: 122px;
    height: 122px;
  }

  .privacy-orbit__core {
    width: 50px;
    height: 50px;
  }

  .closing__panel {
    min-height: 540px;
    padding: 60px 22px;
    border-radius: 30px;
  }

  .closing__panel h2 {
    font-size: 47px;
  }

  .closing__actions {
    width: 100%;
    align-items: stretch;
    flex-direction: column;
  }

  .closing__actions .btn {
    width: 100%;
  }

  .closing__meta {
    flex-wrap: wrap;
    justify-content: center;
  }

  .site-footer {
    padding-top: 12px;
  }
}

@media (max-width: 420px) {
  .float-card--stat {
    display: none;
  }

  .float-card--message {
    bottom: -28px;
  }

  .hero__visual {
    min-height: 510px;
  }

  .board-preview {
    top: 43%;
  }

  .trust-card {
    min-height: 590px;
  }
}