:root {
  --ink: #111426;
  --muted: #697087;
  --paper: #f7f8fc;
  --white: #ffffff;
  --line: #e1e4ed;
  --blue: #3157f6;
  --blue-dark: #203fc2;
  --blue-soft: #e8edff;
  --yellow: #ffd553;
  --violet: #704bd7;
  --green: #21a076;
  --nav-height: 76px;
  --radius-sm: 13px;
  --radius-md: 22px;
  --radius-lg: 34px;
  --shadow-sm: 0 14px 35px rgba(28, 35, 76, 0.08);
  --shadow-lg: 0 32px 75px rgba(30, 42, 100, 0.16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "Noto Sans KR", sans-serif;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}

a {
  color: inherit;
  text-decoration: none;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 12px 17px;
  color: #fff;
  background: var(--ink);
  border-radius: 10px;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.section-pad {
  padding-block: 120px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(247, 248, 252, 0.88);
  border-bottom: 1px solid rgba(220, 224, 235, 0.85);
  backdrop-filter: blur(18px);
}

.navbar {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 23px;
  font-weight: 850;
  letter-spacing: -0.9px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--blue);
  border-radius: 10px;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -2px;
  transform: rotate(-4deg);
  box-shadow: 0 8px 16px rgba(49, 87, 246, 0.24);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 29px;
  margin-left: auto;
}

.nav-links a,
.login-link {
  position: relative;
  color: #4a5065;
  font-size: 14px;
  font-weight: 650;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active,
.login-link:hover {
  color: var(--blue);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -10px;
  left: 0;
  height: 2px;
  background: var(--blue);
  border-radius: 99px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 750;
  line-height: 1;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(49, 87, 246, 0.28);
  outline-offset: 3px;
}

.button-small {
  min-height: 42px;
  padding: 0 18px;
  font-size: 14px;
}

.button-large {
  min-height: 58px;
  padding: 0 27px;
  font-size: 15px;
}

.button-primary {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 12px 27px rgba(49, 87, 246, 0.23);
}

.button-primary:hover {
  background: var(--blue-dark);
  box-shadow: 0 16px 32px rgba(49, 87, 246, 0.29);
}

.button-secondary {
  color: #353b50;
  background: rgba(255, 255, 255, 0.64);
  border-color: #dcdde3;
}

.button-secondary:hover {
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.intro-hero {
  position: relative;
  min-height: 730px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 95px 0 150px;
  background: var(--paper);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(29, 37, 74, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 37, 74, 0.055) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 68% 70% at center, #000 0%, transparent 78%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 26px;
  padding: 8px 12px;
  color: #4d598b;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid #e0e1e7;
  border-radius: 999px;
  box-shadow: 0 7px 19px rgba(33, 41, 75, 0.05);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 1.3px;
}

.eyebrow span {
  width: 7px;
  height: 7px;
  background: var(--blue);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(49, 87, 246, 0.11);
}

.intro-hero h1 {
  max-width: 1050px;
  margin: 0;
  font-size: clamp(45px, 5.5vw, 76px);
  line-height: 1.16;
  letter-spacing: -4px;
  font-weight: 850;
}

.intro-hero h1 em {
  position: relative;
  color: var(--blue);
  font-style: normal;
}

.intro-hero h1 em::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 1px;
  left: 0;
  z-index: -1;
  height: 14px;
  background: var(--yellow);
  border-radius: 2px;
  transform: rotate(-1deg);
}

.hero-description {
  max-width: 740px;
  margin: 29px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: -0.3px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 34px;
}

.hero-note {
  margin: 21px 0 0;
  color: #8a8f9e;
  font-size: 11px;
}

.hero-orb {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  color: var(--blue);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #dcdee7;
  box-shadow: var(--shadow-sm);
  border-radius: 24px;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-weight: 700;
  animation: float 5s ease-in-out infinite;
}

.orb-one {
  top: 18%;
  left: 7%;
  width: 95px;
  height: 95px;
  font-size: 43px;
  transform: rotate(-9deg);
}

.orb-two {
  top: 24%;
  right: 7%;
  width: 112px;
  height: 78px;
  color: var(--violet);
  font-size: 31px;
  transform: rotate(8deg);
  animation-delay: -1.7s;
}

.orb-three {
  right: 15%;
  bottom: 18%;
  width: 67px;
  height: 67px;
  color: var(--violet);
  background: var(--blue-soft);
  font-size: 30px;
  border-radius: 50%;
  animation-delay: -3s;
}

.hero-marquee {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  overflow: hidden;
  height: 58px;
  display: flex;
  align-items: center;
  color: #fff;
  background: var(--blue);
  transform: rotate(-1.2deg) scale(1.02);
}

.hero-marquee div {
  width: max-content;
  display: flex;
  align-items: center;
  gap: 28px;
  white-space: nowrap;
  animation: marquee 25s linear infinite;
}

.hero-marquee span {
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 2px;
}

.hero-marquee i {
  color: var(--yellow);
  font-style: normal;
}

.manifesto {
  background: #fff;
}

.manifesto-grid {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 70px;
}

.section-index {
  display: flex;
  align-items: center;
  gap: 11px;
  height: fit-content;
  color: #969bab;
}

.section-index span {
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 12px;
}

.section-index p {
  margin: 0;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 1.6px;
}

.section-index::after {
  content: "";
  flex: 1;
  height: 1px;
  min-width: 24px;
  background: #d8dae1;
}

.manifesto-copy {
  max-width: 900px;
}

.lead-copy {
  margin: -10px 0 55px;
  font-size: clamp(33px, 4vw, 52px);
  line-height: 1.45;
  letter-spacing: -2.4px;
  font-weight: 450;
}

.lead-copy strong {
  color: var(--blue);
  font-weight: 850;
}

.manifesto-detail {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 54px;
  padding-top: 35px;
  border-top: 1px solid var(--line);
}

.manifesto-detail p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.problem-section {
  color: #fff;
  background: var(--ink);
}

.section-heading {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 70px;
  margin-bottom: 58px;
}

.light-index {
  color: #747d9a;
}

.light-index::after {
  background: #363c55;
}

.kicker {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.7px;
}

.problem-section .kicker,
.system-heading .kicker {
  color: #91a4ff;
}

.section-heading h2,
.answer-copy h2,
.system-heading h2,
.principles-heading h2,
.starting-copy h2,
.cta-inner h2 {
  margin: 0;
  font-size: clamp(37px, 4.3vw, 55px);
  line-height: 1.25;
  letter-spacing: -2.8px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-left: 230px;
}

.problem-grid article {
  position: relative;
  min-height: 350px;
  padding: 29px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  transition: transform 0.25s ease, background 0.25s ease;
}

.problem-grid article:hover {
  background: rgba(255, 255, 255, 0.085);
  transform: translateY(-5px);
}

.card-number {
  position: absolute;
  top: 24px;
  right: 24px;
  color: #68708d;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 11px;
}

.problem-symbol {
  height: 130px;
  display: grid;
  place-items: center;
  margin-bottom: 28px;
  color: #aebaff;
  background: rgba(77, 99, 201, 0.13);
  border: 1px solid rgba(123, 142, 229, 0.13);
  border-radius: 16px;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 29px;
  font-style: italic;
}

.problem-symbol.crossed {
  color: #ffcf73;
  text-decoration: line-through 2px #ef7171;
}

.problem-symbol.shifting {
  color: #74d6b4;
  animation: subtle-pulse 2.7s ease-in-out infinite;
}

.problem-grid h3 {
  margin: 0 0 13px;
  font-size: 18px;
  letter-spacing: -0.7px;
}

.problem-grid p {
  margin: 0;
  color: #9da4ba;
  font-size: 12px;
  line-height: 1.75;
}

.problem-conclusion {
  margin: 52px 0 0 230px;
  padding-top: 28px;
  color: #9da4ba;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 17px;
  line-height: 1.7;
}

.problem-conclusion strong {
  color: #fff;
}

.visual-answer {
  background: #f2f3f8;
}

.answer-grid {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  align-items: center;
  gap: 90px;
}

.answer-copy .section-index,
.principles-heading .section-index,
.starting-copy .section-index {
  width: 160px;
  margin-bottom: 48px;
}

.answer-copy > p:not(.kicker) {
  margin: 25px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.answer-points {
  display: grid;
  gap: 13px;
  margin: 29px 0 0;
  padding: 0;
  list-style: none;
}

.answer-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #4c536b;
  font-size: 12px;
  font-weight: 650;
}

.answer-points span {
  width: 20px;
  height: 20px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  color: #fff;
  background: var(--green);
  border-radius: 50%;
  font-size: 10px;
}

.visual-demo {
  overflow: hidden;
  background: #fff;
  border: 1px solid #dfe2ec;
  border-radius: 28px;
  box-shadow: var(--shadow-lg);
}

.demo-header {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding: 0 26px;
  border-bottom: 1px solid #e8eaf1;
}

.demo-header > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.demo-label {
  color: var(--blue);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 1px;
}

.demo-header strong {
  font-size: 14px;
}

.demo-step {
  padding: 7px 10px;
  color: var(--blue);
  background: var(--blue-soft);
  border-radius: 999px;
  font-size: 9px;
  font-weight: 850;
}

.demo-canvas {
  min-height: 330px;
  display: grid;
  grid-template-columns: 150px 45px 210px;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 45px 30px;
  background-image: radial-gradient(#d7dbe9 1px, transparent 1px);
  background-size: 20px 20px;
}

.circle-slices {
  position: relative;
  width: 150px;
  height: 150px;
  overflow: hidden;
  background: repeating-conic-gradient(
    from 0deg,
    var(--blue) 0deg 14deg,
    #9cacfa 14deg 28deg
  );
  border: 4px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--blue), 0 14px 25px rgba(49, 87, 246, 0.18);
  animation: circle-turn 18s linear infinite;
}

.circle-slices::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  height: 2px;
  background: #fff;
  transform-origin: left;
}

.circle-slices i {
  position: absolute;
  top: 44%;
  right: 22%;
  z-index: 2;
  color: #fff;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 17px;
  font-style: italic;
}

.demo-arrow {
  color: var(--blue);
  font-size: 30px;
  font-weight: 300;
  animation: arrow-nudge 1.7s ease-in-out infinite;
}

.rearranged-shape {
  position: relative;
  width: 210px;
  height: 105px;
  background: linear-gradient(135deg, #9cacfa, var(--blue));
  clip-path: polygon(9% 0, 100% 0, 91% 100%, 0 100%);
  box-shadow: 0 16px 30px rgba(49, 87, 246, 0.22);
}

.rearranged-shape::before {
  content: "";
  position: absolute;
  top: 0;
  right: 50%;
  bottom: 0;
  width: 1px;
  background: rgba(255, 255, 255, 0.3);
}

.shape-top,
.shape-side {
  position: absolute;
  z-index: 2;
  color: var(--blue);
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 14px;
  font-style: italic;
  font-weight: 700;
}

.shape-top {
  top: -27px;
  left: 45%;
}

.shape-side {
  top: 44%;
  right: -20px;
}

.formula-line {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  min-height: 76px;
  padding: 15px;
  border-top: 1px solid #e8eaf1;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 18px;
}

.formula-line span {
  color: #8c92a5;
  font-family: inherit;
  font-size: 13px;
}

.formula-line i {
  color: #b3b7c4;
  font-style: normal;
}

.formula-line strong {
  color: #40475f;
}

.formula-line em {
  padding: 7px 11px;
  color: #fff;
  background: var(--blue);
  border-radius: 8px;
  font-style: normal;
  font-weight: 800;
}

.demo-progress {
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: #fafbfe;
}

.demo-progress span {
  width: 24px;
  height: 4px;
  background: #dfe2ec;
  border-radius: 99px;
}

.demo-progress .active {
  width: 42px;
  background: var(--blue);
}

.learning-system {
  color: #fff;
  background: var(--ink);
}

.system-heading {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 65px;
  text-align: center;
}

.system-heading .section-index {
  width: 180px;
  margin-bottom: 35px;
}

.system-heading > p:last-child {
  margin: 21px 0 0;
  color: #9ca3ba;
  font-size: 14px;
}

.system-flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.system-flow::before {
  content: "";
  position: absolute;
  top: 83px;
  right: 10%;
  left: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, #5368c6, transparent);
}

.system-flow li {
  position: relative;
  min-height: 310px;
  padding: 25px 22px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 20px;
  transition: transform 0.22s ease, background 0.22s ease;
}

.system-flow li:hover {
  background: rgba(255, 255, 255, 0.09);
  transform: translateY(-5px);
}

.flow-number {
  color: #68718f;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 10px;
}

.flow-icon {
  position: relative;
  z-index: 2;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  margin: 24px 0 40px;
  color: #aebaff;
  background: #252c4e;
  border: 1px solid #364272;
  border-radius: 15px;
  font-size: 22px;
}

.system-flow h3 {
  margin: 0 0 13px;
  font-size: 16px;
  letter-spacing: -0.6px;
}

.system-flow p {
  margin: 0;
  color: #939ab1;
  font-size: 11px;
  line-height: 1.75;
}

.arena-preview {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 78% 12%, rgba(91, 73, 255, 0.22), transparent 30%),
    linear-gradient(145deg, #090d1e 0%, #121a3a 58%, #0b1025 100%);
}

.arena-preview::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(133, 148, 226, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(133, 148, 226, 0.055) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
}

.arena-glow {
  position: absolute;
  top: 9%;
  right: -130px;
  width: 410px;
  height: 410px;
  background: rgba(49, 87, 246, 0.2);
  border-radius: 50%;
  filter: blur(90px);
}

.arena-layout,
.arena-rule-grid {
  position: relative;
  z-index: 1;
}

.arena-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(500px, 1.18fr);
  align-items: center;
  gap: 78px;
}

.arena-copy,
.arena-board {
  min-width: 0;
}

.arena-index {
  width: 250px;
  margin-bottom: 44px;
  color: #8494d9;
}

.arena-index::after {
  background: #35416e;
}

.arena-kicker {
  margin: 0 0 11px;
  color: #9eacff;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.8px;
}

.arena-copy h2 {
  margin: 0;
  font-size: clamp(45px, 6vw, 72px);
  line-height: 1.08;
  letter-spacing: -4px;
}

.arena-lead {
  max-width: 560px;
  margin: 27px 0 0;
  color: #aeb7d7;
  font-size: 14px;
  line-height: 1.85;
}

.arena-lead strong {
  color: #fff;
}

.arena-overview-cta {
  min-height: 49px;
  display: inline-flex;
  align-items: center;
  gap: 34px;
  margin-top: 30px;
  padding: 0 17px;
  color: #fff;
  background:
    linear-gradient(
      110deg,
      #6547de,
      #3157f6
    );
  border: 1px solid
    rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  box-shadow:
    0 15px 35px
    rgba(49, 87, 246, 0.22);
  font-size: 10px;
  font-weight: 900;
}

.arena-overview-cta span {
  font-size: 15px;
}

.arena-entry {
  margin-top: 33px;
  padding: 21px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(167, 180, 242, 0.12);
  border-radius: 17px;
}

.arena-entry > p {
  margin: 0 0 15px;
  color: #8fa2fa;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.3px;
}

.arena-entry ol {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.arena-entry li {
  display: flex;
  align-items: center;
  gap: 11px;
  color: #e5e8f7;
  font-size: 11px;
  font-weight: 700;
}

.arena-entry li span {
  width: 28px;
  height: 23px;
  display: grid;
  place-items: center;
  color: #8fa2fa;
  background: #20294f;
  border-radius: 7px;
  font-size: 9px;
}

.arena-identity-note {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  color: #aeb7d7;
}

.arena-identity-note > span {
  width: 31px;
  height: 31px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  color: #8ea1ff;
  background: #222c55;
  border-radius: 9px;
  font-size: 11px;
}

.arena-identity-note p {
  margin: 0;
  font-size: 10px;
  line-height: 1.65;
}

.arena-identity-note strong {
  color: #fff;
}

.arena-board {
  padding: 27px;
  background: rgba(17, 23, 52, 0.88);
  border: 1px solid rgba(150, 164, 236, 0.18);
  border-radius: 28px;
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.38);
  backdrop-filter: blur(18px);
}

.arena-overview-board {
  min-height: 480px;
  display: flex;
  flex-direction: column;
}

.arena-overview-statement {
  padding: 39px 5px 31px;
}

.arena-overview-statement small {
  color: #8295ef;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.5px;
}

.arena-overview-statement h3 {
  margin: 16px 0 0;
  font-size:
    clamp(27px, 3.6vw, 42px);
  line-height: 1.25;
  letter-spacing: -1.8px;
}

.arena-overview-statement p {
  max-width: 540px;
  margin: 17px 0 0;
  color: #9fa9ca;
  font-size: 10px;
  line-height: 1.75;
}

.arena-overview-points {
  display: grid;
  grid-template-columns:
    repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: auto;
}

.arena-overview-points article {
  min-height: 135px;
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  padding: 17px;
  background:
    rgba(255, 255, 255, 0.045);
  border: 1px solid
    rgba(151, 166, 235, 0.12);
  border-radius: 13px;
}

.arena-overview-points span {
  color: #8498f8;
  font-size: 9px;
  font-weight: 900;
}

.arena-overview-points strong {
  margin-top: 18px;
  font-size: 12px;
}

.arena-overview-points p {
  margin: 7px 0 0;
  color: #8f99b9;
  font-size: 9px;
  line-height: 1.55;
}

.arena-board-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 19px;
  border-bottom: 1px solid rgba(156, 170, 235, 0.12);
}

.arena-board-top > div {
  display: grid;
  gap: 5px;
}

.arena-board-top span,
.arena-board-top strong {
  font-size: 9px;
  letter-spacing: 1.2px;
}

.arena-board-top span {
  color: #8295ef;
}

.arena-board-top strong {
  color: #e8ebfb;
}

.arena-board-top em {
  padding: 7px 10px;
  color: #ffd887;
  background: rgba(255, 196, 82, 0.1);
  border: 1px solid rgba(255, 196, 82, 0.15);
  border-radius: 999px;
  font-size: 9px;
  font-style: normal;
  font-weight: 800;
}

.arena-rank-card {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  margin-top: 21px;
  padding: 21px;
  background: linear-gradient(135deg, rgba(55, 70, 135, 0.72), rgba(36, 45, 91, 0.62));
  border: 1px solid rgba(166, 180, 246, 0.16);
  border-radius: 19px;
}

.arena-rank-card .rank-crest {
  justify-self: center;
  margin-block: -27px;
}

.tier-copy,
.rank-change {
  display: grid;
  gap: 5px;
}

.tier-copy small,
.rank-change span {
  color: #9ba7ce;
  font-size: 9px;
}

.tier-copy strong {
  color: #ffe49a;
  font-size: 24px;
  letter-spacing: -0.8px;
}

.tier-copy p {
  margin: 0;
  color: #b8c0dc;
  font-size: 9px;
}

.tier-copy b {
  color: #fff;
}

.rank-change {
  min-width: 76px;
  justify-items: end;
  padding-left: 18px;
  border-left: 1px solid rgba(167, 179, 235, 0.14);
}

.rank-change strong {
  font-size: 17px;
}

.rank-change em {
  color: #5ee0ac;
  font-size: 9px;
  font-style: normal;
  font-weight: 800;
}

.arena-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
  margin-top: 10px;
}

.arena-metrics article {
  min-width: 0;
  display: grid;
  gap: 7px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(166, 179, 235, 0.1);
  border-radius: 14px;
}

.arena-metrics span,
.arena-metrics small {
  color: #929dbe;
  font-size: 9px;
}

.arena-metrics strong {
  font-size: 19px;
}

.arena-ladder {
  display: flex;
  gap: 6px;
  margin-top: 15px;
  padding: 6px;
  background: rgba(5, 9, 24, 0.5);
  border-radius: 11px;
}

.arena-ladder span {
  min-width: 0;
  flex: 1;
  padding: 8px 4px;
  color: #717d9f;
  border-radius: 8px;
  text-align: center;
  font-size: 9px;
  font-weight: 800;
}

.arena-ladder .active {
  color: #fff3bd;
  background: rgba(205, 159, 53, 0.2);
}

.arena-duel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 14px;
  padding: 15px 17px;
  background: linear-gradient(105deg, rgba(70, 52, 173, 0.4), rgba(39, 86, 218, 0.24));
  border: 1px solid rgba(132, 141, 255, 0.17);
  border-radius: 14px;
}

.arena-duel > div {
  display: grid;
  gap: 4px;
}

.arena-duel small {
  color: #9caaff;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1px;
}

.arena-duel strong {
  font-size: 10px;
}

.arena-duel > span {
  color: #bac3e1;
  font-size: 9px;
}

.arena-rule-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 13px;
  margin-top: 58px;
}

.arena-rule-grid article {
  min-height: 185px;
  padding: 23px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(160, 173, 235, 0.11);
  border-radius: 16px;
}

.arena-rule-grid article > span {
  color: #7f91e8;
  font-size: 9px;
  font-weight: 900;
}

.arena-rule-grid h3 {
  margin: 35px 0 10px;
  font-size: 14px;
  letter-spacing: -0.4px;
}

.arena-rule-grid p {
  margin: 0;
  color: #949fbe;
  font-size: 10px;
  line-height: 1.7;
}

.takeover-detail {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 30px 56px;
  margin-top: 18px;
  padding: clamp(28px, 4vw, 48px);
  background:
    radial-gradient(circle at 12% 18%, rgba(136, 82, 255, 0.15), transparent 34%),
    rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(160, 173, 235, 0.12);
  border-radius: 22px;
}

.takeover-heading > p {
  margin: 0 0 14px;
  color: #90a1ff;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.5px;
}

.takeover-heading h3 {
  margin: 0;
  font-size: clamp(25px, 3vw, 37px);
  line-height: 1.25;
  letter-spacing: -1.5px;
}

.takeover-heading > span {
  display: block;
  margin-top: 18px;
  color: #9da8c8;
  font-size: 10px;
  line-height: 1.8;
}

.takeover-stakes {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 12px;
}

.takeover-stakes article {
  min-width: 0;
  padding: 22px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(169, 181, 241, 0.13);
  border-radius: 16px;
}

.takeover-stakes small {
  color: #8095f2;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1px;
}

.takeover-stakes strong {
  display: block;
  margin-top: 16px;
  font-size: 13px;
}

.takeover-stakes p {
  margin: 9px 0 0;
  color: #98a3c3;
  font-size: 9px;
  line-height: 1.65;
}

.takeover-stakes > b {
  align-self: center;
  color: #7588e6;
  font-size: 9px;
  letter-spacing: 1px;
}

.takeover-flow {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.takeover-flow li {
  min-width: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 11px;
  padding: 16px;
  background: rgba(5, 8, 23, 0.28);
  border-radius: 13px;
}

.takeover-flow li > b {
  color: #7e91e9;
  font-size: 9px;
}

.takeover-flow span {
  color: #919cbb;
  font-size: 9px;
  line-height: 1.55;
}

.takeover-flow strong {
  display: block;
  margin-bottom: 5px;
  color: #eef1ff;
  font-size: 10px;
}

.takeover-guardrails {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.takeover-guardrails span {
  padding: 8px 11px;
  color: #aab5d5;
  background: rgba(118, 136, 224, 0.08);
  border: 1px solid rgba(150, 166, 241, 0.12);
  border-radius: 999px;
  font-size: 9px;
}

.rank-cycle-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 11px;
}

.rank-cycle-summary article {
  min-width: 0;
  padding: 17px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(166, 179, 235, 0.1);
  border-radius: 14px;
}

.rank-cycle-summary small {
  color: #8ea1f8;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1px;
}

.rank-cycle-summary strong {
  display: block;
  margin-top: 8px;
  font-size: 17px;
}

.rank-cycle-summary p {
  margin: 7px 0 0;
  color: #939ebd;
  font-size: 9px;
  line-height: 1.6;
}

.payback-preview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  margin-top: 14px;
  padding: 17px;
  background: linear-gradient(105deg, rgba(70, 52, 173, 0.4), rgba(39, 86, 218, 0.24));
  border: 1px solid rgba(132, 141, 255, 0.17);
  border-radius: 14px;
}

.payback-preview > div {
  display: grid;
  gap: 5px;
}

.payback-preview small {
  color: #9caaff;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1px;
}

.payback-preview strong {
  font-size: 11px;
}

.payback-preview > b {
  color: #7f94f1;
  font-size: 11px;
}

.payback-detail,
.weekly-rank-detail,
.rank-pool-detail,
.arena-tier-section {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  padding: clamp(28px, 4vw, 48px);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(160, 173, 235, 0.12);
  border-radius: 22px;
}

.payback-detail {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 30px 56px;
  background:
    radial-gradient(circle at 12% 18%, rgba(136, 82, 255, 0.15), transparent 34%),
    rgba(255, 255, 255, 0.035);
}

.payback-heading > p,
.weekly-rank-heading > p,
.rank-pool-heading > p,
.arena-tier-section > div:first-child > p {
  margin: 0 0 14px;
  color: #90a1ff;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.5px;
}

.payback-heading h3,
.weekly-rank-heading h3,
.rank-pool-heading h3,
.arena-tier-section > div:first-child > h3 {
  margin: 0;
  font-size: clamp(25px, 3vw, 37px);
  line-height: 1.25;
  letter-spacing: -1.5px;
}

.payback-heading > span,
.weekly-rank-heading > span,
.rank-pool-heading > span {
  display: block;
  margin-top: 18px;
  color: #9da8c8;
  font-size: 10px;
  line-height: 1.8;
}

.payback-conditions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 12px;
}

.payback-conditions article,
.payback-result article,
.rank-pool-detail > article {
  min-width: 0;
  padding: 22px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(169, 181, 241, 0.13);
  border-radius: 16px;
}

.payback-conditions small,
.payback-result small,
.rank-pool-detail > article small {
  color: #8095f2;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1px;
}

.payback-conditions strong,
.payback-result strong {
  display: block;
  margin-top: 16px;
  font-size: 13px;
}

.payback-conditions p,
.payback-result p {
  margin: 9px 0 0;
  color: #98a3c3;
  font-size: 9px;
  line-height: 1.7;
}

.payback-conditions > b {
  align-self: center;
  color: #7588e6;
  font-size: 9px;
  letter-spacing: 1px;
}

.payback-result {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.weekly-rank-detail {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 30px 56px;
}

.weekly-rank-flow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.weekly-rank-flow li {
  min-width: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 11px;
  padding: 18px;
  background: rgba(5, 8, 23, 0.28);
  border-radius: 13px;
}

.weekly-rank-flow li > b {
  color: #7e91e9;
  font-size: 9px;
}

.weekly-rank-flow span {
  color: #919cbb;
  font-size: 9px;
  line-height: 1.6;
}

.weekly-rank-flow strong {
  display: block;
  margin-bottom: 5px;
  color: #eef1ff;
  font-size: 10px;
}

.rank-pool-detail {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.rank-pool-heading {
  padding-right: 22px;
}

.rank-pool-detail > article {
  padding: 26px;
}

.rank-pool-detail > article h4 {
  margin: 22px 0 14px;
  font-size: 16px;
  letter-spacing: -0.5px;
}

.rank-pool-detail > article ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  color: #9ca7c6;
  list-style: none;
  font-size: 9px;
  line-height: 1.6;
}

.rank-pool-detail > article li {
  position: relative;
  padding-left: 15px;
}

.rank-pool-detail > article li::before {
  content: "";
  position: absolute;
  top: 0.65em;
  left: 0;
  width: 5px;
  height: 5px;
  background: #8397f6;
  border-radius: 50%;
}

.sub-pool {
  box-shadow: inset 3px 0 0 #8a66ff;
}

.main-pool {
  box-shadow: inset 3px 0 0 #55c5ef;
}

.arena-tier-section > div:first-child {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
}

.arena-tier-section > div:first-child > h3 {
  max-width: 720px;
}

.arena-tier-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 7px;
  margin-top: 28px;
}

.arena-tier-grid article {
  min-width: 0;
  min-height: 190px;
  display: grid;
  grid-template-rows: auto minmax(109px, 1fr) auto auto;
  align-content: stretch;
  justify-items: center;
  gap: 7px;
  padding: 14px 10px;
  text-align: center;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(166, 179, 235, 0.1);
  border-radius: 12px;
}

.arena-tier-grid article > span {
  justify-self: start;
  color: #74809d;
  font-size: 9px;
  font-weight: 900;
}

.arena-tier-grid .rank-crest {
  --rank-crest-width: 62px;
  align-self: center;
  justify-self: center;
  margin: -4px 0 -7px;
}

.arena-tier-grid strong {
  font-size: 10px;
}

.arena-tier-grid small {
  color: #8f99b5;
  font-size: 9px;
}

@media (max-width: 1050px) {
  .payback-detail,
  .weekly-rank-detail {
    grid-template-columns: 1fr;
  }

  .payback-result {
    grid-column: 1;
  }

  .rank-pool-detail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rank-pool-heading {
    grid-column: 1 / -1;
    max-width: 720px;
    padding-right: 0;
  }

  .arena-tier-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .rank-cycle-summary,
  .payback-result,
  .weekly-rank-flow,
  .rank-pool-detail,
  .arena-tier-grid {
    grid-template-columns: 1fr;
  }

  .payback-preview,
  .payback-conditions {
    grid-template-columns: 1fr;
  }

  .payback-preview > b,
  .payback-conditions > b {
    justify-self: center;
  }

  .rank-pool-heading {
    grid-column: 1;
  }

  .arena-tier-grid article {
    min-height: 170px;
  }

  .arena-tier-section > div:first-child {
    align-items: flex-start;
    flex-direction: column;
  }
}

.principles {
  background: #fff;
}

.principles-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 100px;
}

.principles-heading {
  position: sticky;
  top: calc(var(--nav-height) + 45px);
  align-self: start;
}

.principles-heading > p:last-child,
.starting-copy > p:not(.kicker) {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.85;
}

.principle-list {
  border-top: 1px solid var(--line);
}

.principle-list article {
  display: grid;
  grid-template-columns: 65px 1fr;
  gap: 25px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.principle-list article > span {
  color: var(--blue);
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 12px;
}

.principle-list h3 {
  margin: 0 0 11px;
  font-size: 20px;
  letter-spacing: -0.8px;
}

.principle-list p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.75;
}

.tone-banner {
  padding: 30px 0;
  color: #fff;
  background: var(--blue);
}

.tone-inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr auto;
  align-items: center;
  gap: 30px;
}

.tone-title {
  display: flex;
  align-items: center;
  gap: 14px;
}

.tone-mark {
  width: 45px;
  height: 45px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  color: var(--blue);
  background: #fff;
  border-radius: 13px;
  font-weight: 900;
}

.tone-title > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.tone-title small {
  color: #bfc9ff;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 1px;
}

.tone-title strong {
  font-size: 14px;
}

.tone-inner > p {
  margin: 0;
  color: #d6dcff;
  font-size: 11px;
}

.tone-modes {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.13);
  border-radius: 10px;
}

.tone-modes button {
  padding: 9px 13px;
  color: #c3ccff;
  background: transparent;
  border: 0;
  border-radius: 7px;
  font-family: inherit;
  font-size: 9px;
  font-weight: 750;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease;
}

/* JS가 선택 상태를 갱신하는 코치 말투 버튼의 독립 식별자입니다. */
.intro-coach-mode {
  min-width: 48px;
}

.tone-modes button:hover { color: #fff; }
.tone-modes button:focus-visible { outline: 3px solid rgba(255,255,255,.45); outline-offset: 2px; }

.tone-modes .active {
  color: var(--blue);
  background: #fff;
}

.starting-point {
  background: #f3f4f8;
}

.starting-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 105px;
}

.start-card {
  position: relative;
  overflow: hidden;
  min-height: 500px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 55px;
  color: #fff;
  background: linear-gradient(145deg, var(--blue), #563bd1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.start-card::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 260px;
  height: 260px;
  border: 50px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.start-card::after {
  content: "M";
  position: absolute;
  right: -15px;
  bottom: -65px;
  color: rgba(255, 255, 255, 0.07);
  font-size: 260px;
  font-weight: 900;
  line-height: 1;
  transform: rotate(-8deg);
}

.curriculum-tag {
  position: relative;
  z-index: 2;
  width: fit-content;
  padding: 8px 10px;
  color: #d2d9ff;
  background: rgba(255, 255, 255, 0.13);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 8px;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 1px;
}

.big-number {
  position: relative;
  z-index: 2;
  margin-top: 25px;
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 125px;
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -7px;
}

.start-card > p {
  position: relative;
  z-index: 2;
  margin: 13px 0 35px;
  color: #d6dcff;
  font-size: 13px;
}

.course-lines {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 8px;
}

.course-lines span {
  width: var(--width);
  height: 7px;
  background: rgba(255, 255, 255, 0.22);
  border-radius: 99px;
}

.course-lines span:nth-child(1),
.course-lines span:nth-child(3) {
  background: rgba(255, 255, 255, 0.65);
}

.course-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.course-tags span {
  padding: 9px 12px;
  color: #4d5675;
  background: #fff;
  border: 1px solid #dfe2eb;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 750;
}

.final-cta {
  position: relative;
  overflow: hidden;
  padding: 120px 0;
  color: #fff;
  background: var(--ink);
}

.cta-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 45px 45px;
  mask-image: radial-gradient(circle at center, #000, transparent 72%);
}

.cta-inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.cta-inner > p {
  margin: 0 0 18px;
  color: #909abd;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 2px;
}

.cta-inner h2 {
  max-width: 800px;
  font-size: clamp(42px, 5vw, 64px);
}

.button-white {
  margin-top: 36px;
  color: var(--blue);
  background: #fff;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.24);
}

.cta-inner small {
  margin-top: 18px;
  color: #7f869e;
  font-size: 9px;
}

.cta-symbol {
  position: absolute;
  z-index: 1;
  color: rgba(255, 255, 255, 0.07);
  font-family: "SUIT Variable", "Pretendard Variable", Pretendard, sans-serif;
  font-weight: 700;
}

.symbol-left {
  top: 21%;
  left: 8%;
  font-size: 120px;
  transform: rotate(-14deg);
}

.symbol-right {
  right: 8%;
  bottom: 20%;
  font-size: 65px;
  transform: rotate(11deg);
}

.site-footer {
  color: #dfe3ef;
  background: #0b0e1b;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 80px;
  padding-block: 62px 50px;
}

.footer-brand-area .brand {
  color: #fff;
}

.footer-brand-area > p {
  margin: 17px 0 0;
  color: #747b94;
  font-size: 12px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 130px);
  gap: 42px;
}

.footer-links > div {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links strong {
  margin-bottom: 4px;
  color: #fff;
  font-size: 11px;
}

.footer-links a {
  color: #747b94;
  font-size: 10px;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #565d74;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 9px;
}

@keyframes float {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -10px; }
}

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

@keyframes subtle-pulse {
  0%, 100% { box-shadow: inset 0 0 0 0 rgba(80, 210, 164, 0); }
  50% { box-shadow: inset 0 0 0 4px rgba(80, 210, 164, 0.12); }
}

@keyframes circle-turn {
  to { transform: rotate(360deg); }
}

@keyframes arrow-nudge {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(7px); }
}

@media (max-width: 1050px) {
  .nav-links {
    gap: 18px;
  }

  .problem-grid,
  .problem-conclusion {
    margin-left: 0;
  }

  .answer-grid,
  .principles-layout,
  .starting-grid {
    gap: 55px;
  }

  .system-flow {
    grid-template-columns: repeat(3, 1fr);
  }

  .system-flow::before {
    display: none;
  }

  .arena-layout {
    grid-template-columns: 1fr;
  }

  .arena-copy {
    max-width: 700px;
  }

  .arena-board {
    width: min(700px, 100%);
  }

  .arena-rule-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .takeover-detail {
    grid-template-columns: 1fr;
  }

  .takeover-flow,
  .takeover-guardrails {
    grid-column: 1;
  }

  .tone-inner {
    grid-template-columns: 1fr auto;
  }

  .tone-inner > p {
    display: none;
  }
}

@media (max-width: 900px) {
  :root {
    --nav-height: 68px;
  }

  .section-pad {
    padding-block: 88px;
  }

  .nav-links {
    display: none;
  }

  .intro-hero {
    min-height: 680px;
    padding-top: 75px;
  }

  .orb-one {
    left: 2%;
    opacity: 0.55;
  }

  .orb-two {
    right: 2%;
    opacity: 0.55;
  }

  .manifesto-grid,
  .section-heading {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .section-index {
    width: 160px;
  }

  .manifesto-detail {
    gap: 30px;
  }

  .problem-grid {
    grid-template-columns: 1fr;
    max-width: 650px;
  }

  .problem-grid article {
    min-height: auto;
  }

  .problem-symbol {
    height: 105px;
  }

  .answer-grid,
  .principles-layout,
  .starting-grid {
    grid-template-columns: 1fr;
  }

  .answer-copy,
  .starting-copy {
    max-width: 680px;
  }

  .visual-demo {
    width: min(680px, 100%);
  }

  .system-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .system-flow li {
    min-height: 270px;
  }

  .principles-heading {
    position: static;
  }

  .tone-inner {
    grid-template-columns: 1fr;
  }

  .tone-modes {
    width: fit-content;
  }

  .start-card {
    width: min(600px, 100%);
    min-height: 430px;
  }

  .starting-copy {
    order: -1;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 32px, 1180px);
  }

  .section-pad {
    padding-block: 72px;
  }

  .brand {
    font-size: 20px;
  }

  .brand-mark {
    width: 31px;
    height: 31px;
    font-size: 17px;
  }

  .login-link {
    display: none;
  }

  .button-small {
    min-height: 39px;
    padding-inline: 13px;
    font-size: 12px;
  }

  .intro-hero {
    min-height: 640px;
    padding: 65px 0 130px;
  }

  .intro-hero h1 {
    font-size: 39px;
    letter-spacing: -2.4px;
  }

  .intro-hero h1 em::after {
    height: 8px;
  }

  .hero-description {
    font-size: 14px;
    line-height: 1.75;
  }

  .hero-actions {
    width: 100%;
    display: grid;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-orb {
    display: none;
  }

  .lead-copy {
    font-size: 31px;
    letter-spacing: -1.8px;
  }

  .manifesto-detail {
    grid-template-columns: 1fr;
  }

  .section-heading h2,
  .answer-copy h2,
  .system-heading h2,
  .principles-heading h2,
  .starting-copy h2,
  .cta-inner h2 {
    font-size: 33px;
    letter-spacing: -1.8px;
  }

  .problem-grid article {
    padding: 23px;
  }

  .problem-conclusion {
    font-size: 14px;
  }

  .demo-header {
    min-height: 72px;
    padding: 0 17px;
  }

  .demo-step {
    display: none;
  }

  .demo-canvas {
    min-height: 420px;
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 25px;
  }

  .demo-arrow {
    transform: rotate(90deg);
  }

  .rearranged-shape {
    width: 200px;
  }

  .formula-line {
    flex-wrap: wrap;
    gap: 10px;
    font-size: 16px;
  }

  .formula-line span {
    width: 100%;
    text-align: center;
  }

  .system-flow {
    grid-template-columns: 1fr;
  }

  .system-flow li {
    min-height: auto;
  }

  .arena-copy h2 {
    font-size: 43px;
    letter-spacing: -2.4px;
  }

  .arena-board {
    padding: 18px;
    border-radius: 21px;
  }

  .arena-overview-board {
    min-height: auto;
  }

  .arena-overview-points {
    grid-template-columns: 1fr;
  }

  .arena-overview-points article {
    min-height: 112px;
  }

  .arena-overview-cta {
    width: 100%;
    justify-content: space-between;
  }

  .arena-rank-card {
    grid-template-columns: 78px minmax(0, 1fr);
    padding: 16px;
  }

  .arena-rank-card .rank-crest {
    --rank-crest-width: 66px;
    margin-block: -21px;
  }

  .rank-change {
    grid-column: 1 / -1;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    justify-items: start;
    padding: 12px 0 0;
    border-top: 1px solid rgba(167, 179, 235, 0.14);
    border-left: 0;
  }

  .rank-change em {
    justify-self: end;
  }

  .arena-metrics,
  .arena-rule-grid,
  .takeover-flow {
    grid-template-columns: 1fr;
  }

  .takeover-stakes {
    grid-template-columns: 1fr;
  }

  .takeover-stakes > b {
    justify-self: center;
  }

  .arena-ladder {
    overflow-x: auto;
  }

  .arena-ladder span {
    min-width: 68px;
  }

  .arena-duel {
    align-items: flex-start;
    flex-direction: column;
  }

  .arena-rule-grid article {
    min-height: auto;
  }

  .arena-rule-grid h3 {
    margin-top: 24px;
  }

  .flow-icon {
    margin-bottom: 24px;
  }

  .principle-list article {
    grid-template-columns: 42px 1fr;
    gap: 12px;
  }

  .tone-title strong {
    font-size: 12px;
  }

  .tone-modes {
    width: 100%;
  }

  .tone-modes button {
    flex: 1;
    text-align: center;
  }

  .start-card {
    min-height: 380px;
    padding: 35px 28px;
  }

  .big-number {
    font-size: 100px;
  }

  .final-cta {
    padding: 90px 0;
  }

  .cta-symbol {
    display: none;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Interactive four-step circle-area demo */
.demo-canvas {
  grid-template-columns: 150px 45px 240px;
}

.circle-slices,
.demo-arrow,
.intro-area-wrap,
.formula-line > * {
  transition: opacity 0.42s ease, transform 0.55s cubic-bezier(0.2, 0.75, 0.25, 1),
    filter 0.42s ease;
}

.intro-area-wrap {
  position: relative;
  width: 240px;
  height: 160px;
  display: grid;
  place-items: start center;
  padding-top: 5px;
}

.shape-top,
.shape-side {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 7px 9px;
  color: #59617a;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid #dce2f2;
  border-radius: 8px;
  box-shadow: 0 7px 16px rgba(34, 48, 104, 0.1);
  font-family: inherit;
  font-style: normal;
  line-height: 1.2;
  opacity: 0;
  transform: translateY(7px);
  transition: opacity 0.35s ease, transform 0.45s cubic-bezier(0.2, 0.75, 0.25, 1);
}

.shape-top b,
.shape-side b {
  color: var(--blue);
  font-size: 11px;
}

.shape-top small,
.shape-side small {
  color: #697087;
  font-size: 9px;
  white-space: nowrap;
}

.shape-top {
  top: auto;
  bottom: 0;
  left: 34px;
  text-align: center;
}

.shape-side {
  top: 35px;
  right: -2px;
}

.visual-demo[data-demo-step="1"] .circle-slices {
  background: var(--blue);
  animation: intro-circle-breathe 2.4s ease-in-out infinite;
}

.visual-demo[data-demo-step="1"] .demo-arrow,
.visual-demo[data-demo-step="1"] .intro-area-wrap,
.visual-demo[data-demo-step="2"] .demo-arrow,
.visual-demo[data-demo-step="2"] .intro-area-wrap {
  opacity: 0;
  transform: scale(0.76);
}

.visual-demo[data-demo-step="1"] .formula-line > * {
  opacity: 0.18;
  transform: translateY(6px);
}

.visual-demo[data-demo-step="2"] .circle-slices {
  animation: intro-sector-focus 2.2s ease-in-out infinite;
}

.visual-demo[data-demo-step="2"] .formula-line > * {
  opacity: 0.28;
}

.visual-demo[data-demo-step="3"] .circle-slices {
  animation: circle-turn 8s linear infinite;
}

.visual-demo[data-demo-step="3"] .demo-arrow,
.visual-demo[data-demo-step="3"] .intro-area-wrap {
  opacity: 1;
  transform: none;
}

.visual-demo[data-demo-step="3"].is-changing .rearranged-shape {
  animation: intro-rearrange 0.7s cubic-bezier(0.2, 0.8, 0.25, 1) both;
}

.visual-demo[data-demo-step="3"] .formula-line em {
  opacity: 0.35;
}

.visual-demo[data-demo-step="4"] .circle-slices {
  opacity: 0.25;
  filter: saturate(0.4);
  animation: none;
  transform: scale(0.9);
}

.visual-demo[data-demo-step="4"] .demo-arrow {
  opacity: 0.48;
}

.visual-demo[data-demo-step="4"] .intro-area-wrap {
  opacity: 1;
  transform: scale(1.04);
}

.visual-demo[data-demo-step="4"] .shape-top,
.visual-demo[data-demo-step="4"] .shape-side {
  opacity: 1;
  transform: none;
}

.visual-demo[data-demo-step="4"].is-changing .shape-top {
  transition-delay: 0.18s;
}

.visual-demo[data-demo-step="4"].is-changing .shape-side {
  transition-delay: 0.34s;
}

.visual-demo[data-demo-step="4"].is-changing .formula-line em {
  animation: intro-formula-pop 0.65s cubic-bezier(0.2, 0.8, 0.25, 1) both;
}

.demo-progress {
  gap: 6px;
}

.intro-step-button {
  width: 27px;
  height: 25px;
  padding: 0;
  color: #8a91a5;
  background: #dfe2ec;
  border: 0;
  border-radius: 8px;
  font-family: inherit;
  font-size: 9px;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  transition: width 0.22s ease, color 0.22s ease, background 0.22s ease,
    transform 0.22s ease;
}

.intro-step-button:hover {
  color: var(--blue);
  transform: translateY(-1px);
}

.intro-step-button.active {
  width: 58px;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 7px 14px rgba(49, 87, 246, 0.2);
}

.intro-step-button.active::before {
  content: "STEP ";
  font-size: 9px;
}

.intro-step-button:focus-visible {
  outline: 3px solid rgba(49, 87, 246, 0.25);
  outline-offset: 2px;
}

@keyframes intro-circle-breathe {
  0%,
  100% {
    box-shadow: 0 0 0 2px var(--blue), 0 14px 25px rgba(49, 87, 246, 0.18);
  }
  50% {
    box-shadow: 0 0 0 9px rgba(49, 87, 246, 0.12),
      0 18px 32px rgba(49, 87, 246, 0.25);
  }
}

@keyframes intro-sector-focus {
  0%,
  100% {
    transform: rotate(0) scale(1);
  }
  50% {
    transform: rotate(14deg) scale(1.04);
  }
}

@keyframes intro-rearrange {
  0% {
    opacity: 0;
    transform: translateX(-35px) skewX(-8deg) scale(0.82);
  }
  100% {
    opacity: 1;
    transform: none;
  }
}

@keyframes intro-formula-pop {
  0% {
    transform: scale(0.72);
  }
  65% {
    transform: scale(1.16);
  }
  100% {
    transform: scale(1);
  }
}

@media (max-width: 1050px) {
  .demo-canvas {
    grid-template-columns: 135px 42px 210px;
  }

  .intro-area-wrap {
    width: 210px;
    height: 150px;
  }

  .shape-top {
    left: 20px;
  }
}

@media (max-width: 640px) {
  .demo-step {
    display: inline-flex;
  }

  .demo-canvas {
    grid-template-columns: 1fr;
  }

  .intro-area-wrap {
    width: 225px;
    height: 155px;
  }

  .shape-top {
    left: 27px;
  }

  .visual-demo[data-demo-step="1"] .demo-arrow,
  .visual-demo[data-demo-step="2"] .demo-arrow {
    transform: rotate(90deg) scale(0.76);
  }

  .visual-demo[data-demo-step="3"] .demo-arrow,
  .visual-demo[data-demo-step="4"] .demo-arrow {
    transform: rotate(90deg);
  }
}