/* Xây dựng cỗ máy kinh doanh AI · landing page
   Layout: blue "stage" bands (hero, system, founder, signup) alternate with white/paper reading bands;
   navy is reserved for the price bar, skills band and emphasis cards. Brand: VISUN AI Brand Guidelines v1.0. */

:root {
  --blue: #206dc1;
  --blue-deep: #155a9f;
  --blue-dark: #0e4c8f;
  --blue-light: #88b2dc;
  --navy: #0a2540;
  --orange: #f97e03;
  --sun: #faa402;
  --sun-soft: #fff8e8;
  --ink: #12233a;
  --muted: #5c6b7a;
  --line: #e2e6e8;
  --paper: #f6f8fb;
  --white: #ffffff;
  --on-blue: #e8f1fb;
  --error: #b42318;
  --gradient-sun: linear-gradient(135deg, var(--sun), var(--orange));

  --font-display: "Montserrat", "Montserrat Fallback", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", "Inter Fallback", "Segoe UI", Arial, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1.0625rem;
  --text-lg: 1.1875rem;

  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 10px 30px rgba(10, 37, 64, 0.08);
  --shadow-lg: 0 24px 60px rgba(10, 37, 64, 0.18);
  --gutter: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));

  color-scheme: light;
}

/* Metric-matched fallbacks keep headings from reflowing when the web fonts arrive (layout shift). */
@font-face {
  font-family: "Montserrat Fallback";
  src: local("Arial Bold"), local("Arial-BoldMT");
  font-weight: 600 900;
  ascent-override: 85.79%;
  descent-override: 22.25%;
  line-gap-override: 0%;
  size-adjust: 111%;
}

@font-face {
  font-family: "Inter Fallback";
  src: local("Arial"), local("ArialMT");
  font-weight: 400;
  ascent-override: 92%;
  descent-override: 23%;
  line-gap-override: 0%;
  size-adjust: 105%;
}

@font-face {
  font-family: "Inter Fallback";
  src: local("Arial Bold"), local("Arial-BoldMT");
  font-weight: 600 700;
  ascent-override: 96.8%;
  descent-override: 24.1%;
  line-gap-override: 0%;
  size-adjust: 100%;
}

/* ---------- Base ---------- */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding-bottom: calc(76px + env(safe-area-inset-bottom, 0px));
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--navy);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  font-size: clamp(2rem, 1.35rem + 3.1vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.625rem, 1.2rem + 1.8vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.22;
}

h3 {
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.35;
}

p,
ul,
ol,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

strong {
  font-weight: 600;
}

a {
  color: var(--blue-dark);
  text-underline-offset: 0.18em;
}

:focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 3px;
  border-radius: 4px;
}

.band--blue :focus-visible,
.band--navy :focus-visible,
.price-bar :focus-visible,
.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--sun);
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  flex: none;
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon--lg {
  width: 2.25rem;
  height: 2.25rem;
  stroke-width: 1.5;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: 8px;
  background: var(--white);
  color: var(--navy);
  font-weight: 600;
}

.skip-link:focus {
  transform: none;
}

/* ---------- Layout primitives ---------- */

.wrap {
  width: 100%;
  max-width: calc(1160px + 48px);
  margin-inline: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter-r);
}

.wrap--narrow {
  max-width: calc(880px + 48px);
}

.band {
  position: relative;
  padding-block: 64px;
  background: var(--white);
}

.band--paper {
  background: var(--paper);
}

.band--blue {
  background-color: var(--blue-deep);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(135deg, var(--blue-dark), var(--blue-deep));
  background-size: 56px 56px, 56px 56px, auto;
  color: var(--on-blue);
}

.band--navy {
  background: var(--navy);
  color: var(--on-blue);
}

.band--blue h2,
.band--blue h3,
.band--navy h2,
.band--navy h3,
.band--blue strong,
.band--navy strong {
  color: var(--white);
}

.section-head {
  display: grid;
  gap: 14px;
  max-width: 820px;
  margin-bottom: 40px;
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.section-head p:not(.eyebrow) {
  max-width: 62ch;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--blue-dark);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.5;
  text-transform: uppercase;
}

.section-head--center .eyebrow {
  justify-content: center;
}

.eyebrow--light {
  color: var(--sun-soft);
}

.speed {
  display: inline-flex;
  flex: none;
  gap: 3px;
}

.speed i {
  width: 4px;
  height: 15px;
  transform: skewX(-24deg);
  border-radius: 2px;
  background: var(--gradient-sun);
}

/* ---------- Buttons ---------- */

.button {
  display: inline-flex;
  min-height: 52px;
  padding: 14px 24px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 0;
  border-radius: 10px;
  background: var(--orange);
  color: var(--navy);
  box-shadow: 0 10px 24px rgba(249, 126, 3, 0.28);
  cursor: pointer;
  font: 600 var(--text-base) / 1.3 var(--font-body);
  text-align: center;
  text-decoration: none;
  transition: background-color 160ms ease, transform 160ms ease;
}

.button:hover {
  background: var(--sun);
  transform: translateY(-1px);
}

.button--block {
  width: 100%;
}

.button:disabled {
  cursor: wait;
  opacity: 0.7;
  transform: none;
}

/* ---------- Price bar & header ---------- */

.price-bar {
  background: var(--navy);
  color: var(--white);
}

.price-bar__inner {
  display: flex;
  min-height: 52px;
  padding-block: 8px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.price-bar p {
  min-width: 0;
  font-size: var(--text-sm);
  line-height: 1.4;
}

.price-bar del {
  color: var(--blue-light);
}

.price-bar strong {
  color: var(--sun);
  font-weight: 600;
}

.price-bar__full {
  display: none;
}

.price-bar__link {
  flex: none;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--orange);
  color: var(--navy);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
}

.site-header {
  position: relative;
  z-index: 90;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--blue-dark);
}

.site-header__inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: inline-flex;
  padding-block: 8px;
}

.brand-link img {
  width: 132px;
}

.menu-toggle {
  display: inline-flex;
  min-height: 44px;
  padding: 8px 14px;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 10px;
  background: transparent;
  color: var(--white);
  cursor: pointer;
  font: 600 var(--text-sm) var(--font-body);
}

.main-nav {
  position: absolute;
  top: calc(100% + 4px);
  right: var(--gutter-r);
  left: var(--gutter);
  display: none;
  padding: 8px;
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-lg);
}

.main-nav.is-open {
  display: grid;
}

.main-nav a {
  padding: 12px 14px;
  border-radius: 8px;
  color: var(--navy);
  font-weight: 600;
  text-decoration: none;
}

.main-nav a:hover {
  background: var(--paper);
}

/* ---------- Hero ---------- */

.hero {
  padding-block: 48px 40px;
}

.hero__grid {
  display: grid;
  gap: 40px;
}

.hero__copy {
  display: grid;
  min-width: 0;
  gap: 22px;
}

.hero h1 {
  color: var(--white);
}

.hero h1 span {
  color: var(--sun);
}

.hero__lead {
  max-width: 60ch;
  font-size: var(--text-lg);
}

.hero__cta {
  display: grid;
  gap: 12px;
  justify-items: start;
}

.hero__price {
  font-size: var(--text-sm);
}

.hero__price del {
  color: var(--blue-light);
}

.hero__price strong {
  color: var(--sun);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
}

.hero__pillars {
  display: grid;
  gap: 10px;
}

.hero__pillars li {
  display: flex;
  padding: 12px 14px;
  align-items: flex-start;
  gap: 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 12px;
  background: rgba(10, 37, 64, 0.18);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.hero__pillars .icon {
  margin-top: 1px;
  color: var(--sun);
}

.brain-demo {
  position: relative;
  min-width: 0;
  align-self: center;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  background: var(--navy);
  box-shadow: var(--shadow-lg);
  font-size: var(--text-sm);
}

.brain-demo__label {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 2px 10px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.brain-demo__bar {
  display: flex;
  padding: 16px;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.brain-demo__bar span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue-light);
}

.brain-demo__bar span:first-child {
  background: var(--orange);
}

.brain-demo__bar b {
  margin-left: 6px;
  color: var(--white);
  font-weight: 600;
}

.brain-demo__files {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 14px;
}

.brain-demo__files div {
  display: grid;
  min-width: 0;
  padding: 10px 12px;
  gap: 2px;
  border: 1px solid rgba(136, 178, 220, 0.25);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
}

.brain-demo__files b {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--white);
  font-weight: 600;
}

.brain-demo__files .icon {
  color: var(--sun);
}

.brain-demo__files span {
  overflow-wrap: anywhere;
  color: var(--blue-light);
}

.brain-demo__answer {
  margin: 0 14px 14px;
  padding: 16px;
  border: 1px solid rgba(250, 164, 2, 0.45);
  border-radius: 12px;
  background: linear-gradient(145deg, rgba(32, 109, 193, 0.35), rgba(250, 164, 2, 0.08));
}

.brain-demo__ai {
  display: inline-block;
  margin-bottom: 8px;
  padding: 1px 8px;
  border-radius: 6px;
  background: var(--blue);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
}

.brain-demo__answer p {
  color: var(--white);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
}

.brain-demo__answer small {
  display: block;
  margin-top: 8px;
  color: var(--blue-light);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  font-size: var(--text-sm);
  font-weight: 600;
}

.trust-row li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.trust-row .icon {
  color: var(--sun);
}

/* ---------- Problem ---------- */

.problem-grid {
  display: grid;
  gap: 12px;
}

.problem-grid li {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}

.problem__business {
  max-width: 760px;
  margin: 24px auto 0;
  color: var(--muted);
  text-align: center;
}

.problem__business strong {
  color: var(--ink);
}

.insight {
  display: grid;
  gap: 12px;
  max-width: 900px;
  margin: 36px auto 0;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--navy);
  color: var(--on-blue);
}

.insight h3 {
  color: var(--white);
  font-size: 1.375rem;
}

.insight strong {
  color: var(--sun);
}

/* ---------- Outputs ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}

.stats li {
  display: grid;
  gap: 4px;
  padding: 18px 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  background: rgba(10, 37, 64, 0.22);
  text-align: center;
}

.stats li:last-child {
  grid-column: 1 / -1;
}

.stats strong {
  color: var(--sun);
  font: 800 clamp(2rem, 1.6rem + 1.6vw, 2.75rem) / 1 var(--font-display);
}

.stats span {
  font-size: var(--text-sm);
  font-weight: 600;
}

.output-grid {
  display: grid;
  gap: 16px;
}

.output-card {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  background: rgba(10, 37, 64, 0.22);
}

.output-card > header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}

.output-card > header .icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 8px;
  border-radius: 12px;
  background: rgba(250, 164, 2, 0.16);
  color: var(--sun);
}

.output-card > header p {
  color: var(--sun-soft);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-transform: uppercase;
}

.output-card h3 {
  font-size: 1.25rem;
}

.output-card li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 12px;
  padding-block: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.output-card li b {
  color: var(--white);
  font-weight: 600;
  line-height: 1.4;
}

.output-card li span {
  grid-column: 1;
  font-size: var(--text-sm);
  line-height: 1.5;
}

.output-card li em {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: start;
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  color: var(--sun-soft);
  font-size: 0.75rem;
  font-style: normal;
  font-weight: 600;
  white-space: nowrap;
}

.outputs__note {
  max-width: 760px;
  margin: 32px auto 0;
  font-size: var(--text-sm);
  text-align: center;
}

/* ---------- Outline (roadmap) ---------- */

.day-zero {
  display: grid;
  gap: 4px;
  padding: 18px 22px;
  border-radius: var(--radius);
  background: var(--sun-soft);
  border: 1px solid rgba(249, 126, 3, 0.4);
}

.day-zero strong {
  color: var(--navy);
}

.timeline {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.phase {
  display: grid;
  align-content: start;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow);
}

.phase__head {
  display: grid;
  gap: 6px;
  padding: 22px;
  background: var(--navy);
  color: var(--on-blue);
}

.phase__head span {
  color: var(--sun);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.phase__head h3 {
  color: var(--white);
  font-size: 1.25rem;
}

.phase__head p {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.phase__days li {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 12px;
  padding: 14px 20px;
  border-top: 1px solid var(--line);
}

.phase__days li:first-child {
  border-top: 0;
}

.phase__days b {
  color: var(--blue);
  font: 800 1.0625rem / 1.4 var(--font-display);
  font-variant-numeric: tabular-nums;
}

.phase__days h4 {
  margin: 0;
  color: var(--navy);
  font: 600 1rem / 1.4 var(--font-display);
}

.phase__days small {
  display: block;
  margin-top: 2px;
  color: var(--blue-dark);
  font: 600 0.8125rem / 1.4 var(--font-body);
}

.phase__days p {
  margin-top: 4px;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.5;
}

/* ---------- OS map (infographic) ---------- */
.os-map {
  margin-top: 24px;
  padding: 24px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 1px 1px, rgba(32, 109, 193, 0.14) 1px, transparent 0) 0 0 / 22px 22px,
    var(--paper);
}

.os-map__head {
  display: grid;
  gap: 6px;
  max-width: 40rem;
  margin: 0 auto 24px;
  text-align: center;
}

.os-map__head span {
  color: var(--blue-dark);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.os-map__head strong {
  color: var(--navy);
  font: 700 1.1875rem / 1.35 var(--font-display);
  text-wrap: balance;
}

.os-map__grid {
  display: grid;
  gap: 28px;
}

.os-base {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px 16px;
  padding: 20px;
  border-radius: var(--radius-lg);
  background: var(--navy);
  color: var(--on-blue);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.os-base > .icon {
  color: var(--sun);
}

.os-base__label {
  color: var(--sun);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.os-base__title {
  margin-block: 2px 4px;
  color: var(--white);
  font: 700 1.125rem / 1.35 var(--font-display);
}

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

.os-base__tools li {
  padding: 4px 12px;
  border: 1px solid rgba(136, 178, 220, 0.45);
  border-radius: 999px;
  color: var(--white);
  font-weight: 600;
}

.os-stages {
  display: grid;
  gap: 28px;
}

.os-stage {
  --stage: var(--blue);
  --stage-soft: #e8f1fb;
  position: relative;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 20px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--stage);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow);
}

.os-stage--sell {
  --stage: var(--orange);
  --stage-soft: #fff1e0;
}

.os-stage--run {
  --stage: var(--navy);
  --stage-soft: #e6ebf1;
}

/* Arrow to the next layer: down on mobile, right on desktop */
.os-stage::after,
.os-base::after {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(100% + 6px);
  width: 16px;
  height: 16px;
  border-right: 3px solid var(--blue-light);
  border-bottom: 3px solid var(--blue-light);
  transform: translateX(-50%) rotate(45deg);
}

.os-base {
  position: relative;
}

.os-stage__week {
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
}

.os-stage__week span {
  margin-right: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--stage);
  color: var(--white);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.os-stage--sell .os-stage__week span {
  color: var(--navy);
}

.os-stage__title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.os-stage__title .icon {
  box-sizing: content-box;
  padding: 10px;
  border-radius: 14px;
  background: var(--stage-soft);
  color: var(--stage);
}

.os-stage--sell .os-stage__title .icon {
  color: #b85a00;
}

.os-stage__title p {
  display: grid;
  color: var(--muted);
  font-size: var(--text-sm);
  font-weight: 600;
}

.os-stage__title b {
  color: var(--navy);
  font: 800 1.375rem / 1.2 var(--font-display);
  text-transform: uppercase;
}

.os-stage__promise {
  color: var(--ink);
  font-weight: 600;
  line-height: 1.45;
}

.os-stage__modules {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.os-stage__modules li {
  padding: 5px 10px;
  border-radius: 8px;
  background: var(--stage-soft);
  color: var(--navy);
  font-size: 0.8125rem;
  font-weight: 600;
}

.os-stage__result {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--ink);
  font-size: var(--text-sm);
  line-height: 1.45;
}

.os-stage__result .icon {
  margin-top: 1px;
  color: #12805c;
}

.os-finish {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 24px 20px;
  border-radius: var(--radius-lg);
  background: var(--gradient-sun);
  color: var(--navy);
  text-align: center;
}

.os-finish__label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.os-finish__title {
  font: 800 1.25rem / 1.3 var(--font-display);
  text-wrap: balance;
}

.os-finish ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.os-finish li {
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  font-size: var(--text-sm);
  font-weight: 600;
}

.gift {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-top: 20px;
  padding: 20px 22px;
  border: 1px solid rgba(249, 126, 3, 0.4);
  border-radius: var(--radius);
  background: var(--sun-soft);
}

.gift .icon {
  width: 2rem;
  height: 2rem;
  color: var(--orange);
}

.faq-list summary {
  position: relative;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  color: var(--blue);
  content: "+";
  font: 600 1.5rem/1 var(--font-display);
}

.faq-list details[open] summary::after {
  content: "−";
}

/* ---------- Skills ---------- */

.skills__grid {
  display: grid;
  gap: 32px;
}

.skills .section-head {
  margin-bottom: 0;
}

.steps {
  display: grid;
  gap: 12px;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 16px 18px 16px 62px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  counter-increment: step;
}

.steps li::before {
  position: absolute;
  top: 14px;
  left: 16px;
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 50%;
  background: var(--gradient-sun);
  color: var(--navy);
  content: counter(step);
  font: 700 0.9375rem/1 var(--font-display);
}

/* ---------- Audience ---------- */

.persona-grid {
  display: grid;
  gap: 16px;
}

.persona {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow);
}

.persona .icon {
  color: var(--blue);
}

.persona__fields {
  color: var(--muted);
  font-size: var(--text-sm);
}

.audience__split {
  display: grid;
  align-items: start;
  gap: 16px;
  margin-top: 16px;
}

.not-fit,
.tools {
  display: grid;
  align-content: start;
  gap: 16px;
  padding: 26px;
  border-radius: var(--radius-lg);
}

.not-fit {
  background: var(--navy);
  color: var(--on-blue);
}

.not-fit h3,
.not-fit strong {
  color: var(--white);
}

.not-fit ul,
.tools ul {
  display: grid;
  gap: 12px;
}

.not-fit li,
.tools li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: var(--text-sm);
}

.not-fit .icon {
  margin-top: 2px;
  color: var(--sun);
}

.tools {
  border: 1px solid var(--line);
  background: var(--white);
}

.tools .icon {
  margin-top: 2px;
  color: var(--blue);
}

.tools em {
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--blue-dark);
  color: var(--white);
  font-size: 0.75rem;
  font-style: normal;
  font-weight: 600;
}

.tools > p {
  color: var(--muted);
  font-size: var(--text-sm);
}

/* ---------- How it works & price ---------- */

.how__grid {
  display: grid;
  gap: 24px;
}

.rhythm {
  display: grid;
  border-top: 1px solid var(--line);
}

.rhythm li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-block: 14px;
  border-bottom: 1px solid var(--line);
}

.rhythm .icon {
  margin-top: 3px;
  color: var(--blue);
}

.rhythm strong {
  display: block;
  color: var(--navy);
}

.rhythm span {
  color: var(--muted);
  font-size: var(--text-sm);
}

.price-card {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--navy);
  color: var(--on-blue);
  box-shadow: var(--shadow-lg);
}

.price-card__was {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.price-card__was del {
  color: var(--blue-light);
}

.price-card__was span {
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--gradient-sun);
  color: var(--navy);
  font-size: var(--text-sm);
  font-weight: 600;
}

.price-card__now strong {
  color: var(--white);
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.8rem + 2vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.price-card__policy {
  color: var(--sun);
  font-weight: 600;
}

.price-card__note {
  font-size: var(--text-sm);
}

.exchange {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.exchange > div {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
}

.exchange ul {
  display: grid;
  gap: 10px;
}

.exchange li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: var(--text-sm);
}

.exchange .icon {
  margin-top: 2px;
  color: var(--blue);
}

.how__note {
  max-width: 820px;
  margin: 28px auto 0;
  color: var(--muted);
  text-align: center;
}

.how__note strong {
  color: var(--navy);
}

/* ---------- Founder ---------- */

.founder__grid {
  display: grid;
  gap: 32px;
}

.founder__copy {
  display: grid;
  align-content: start;
  gap: 16px;
}

.founder__copy h2 {
  margin-bottom: 4px;
}

.founder__sign {
  display: grid;
  gap: 2px;
  color: var(--sun-soft);
  font-style: italic;
  font-weight: 600;
}

.founder__name {
  font-size: 1.125em;
}

.founder__photo img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 55% 30%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.photos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 40px;
}

.photos figure {
  display: grid;
  gap: 8px;
}

.photos img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.photos figure:nth-child(3) img {
  object-position: 50% 30%;
}

.photos figcaption {
  font-size: var(--text-sm);
}

/* ---------- FAQ ---------- */

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}

.faq-list summary {
  padding: 18px 56px 18px 20px;
  color: var(--navy);
  font: 600 var(--text-base) / 1.45 var(--font-display);
}

.faq-list details p {
  padding: 0 20px 20px;
  color: var(--muted);
}

/* ---------- Signup ---------- */

.signup {
  padding-top: 88px;
}

.horizon {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 40px;
  fill: var(--paper);
}

.signup__grid {
  display: grid;
  gap: 28px;
}

.signup__head {
  display: grid;
  align-content: start;
  gap: 16px;
}

.signup__price {
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
  background: rgba(10, 37, 64, 0.25);
}

.signup__price del {
  color: var(--blue-light);
}

.signup__price strong {
  color: var(--sun);
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
}

.signup__price span {
  font-size: var(--text-sm);
}

.signup__panel {
  min-width: 0;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--white);
  color: var(--ink);
  box-shadow: var(--shadow-lg);
}

.signup__panel :focus-visible {
  outline-color: var(--navy);
}

.form-grid {
  display: grid;
  gap: 16px;
}

.field {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.field label,
.field legend {
  display: block;
  margin-bottom: 6px;
  padding: 0;
  color: var(--navy);
  font-weight: 600;
  line-height: 1.4;
}

.field input[type="text"],
.field input[type="tel"],
.field input[type="email"],
.field select,
.field textarea {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid var(--muted);
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  font: inherit;
}

.field textarea {
  min-height: 96px;
  resize: vertical;
}

.field [aria-invalid="true"] {
  border: 2px solid var(--error);
}

.field-help,
.field-error {
  margin-top: 4px;
  font-size: var(--text-sm);
}

.field-help {
  color: var(--muted);
}

.field-error {
  color: var(--error);
  font-weight: 600;
}

.field-error:empty {
  margin-top: 0;
}

.choice-grid {
  display: grid;
  gap: 8px;
}

.choice-grid label {
  display: flex;
  min-height: 46px;
  margin: 0;
  padding: 8px 12px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-weight: 400;
  cursor: pointer;
}

.choice-grid input {
  width: 18px;
  height: 18px;
  accent-color: var(--blue);
}

.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.button--submit {
  margin-top: 20px;
}

.privacy-note {
  margin-top: 10px;
  color: var(--muted);
  font-size: var(--text-sm);
  text-align: center;
}

.form-status {
  min-height: 1.6em;
  margin-top: 10px;
  color: var(--error);
  font-weight: 600;
  text-align: center;
}

.form-status:empty {
  margin-top: 0;
}

.success-message {
  padding: 22px;
  border: 1px solid rgba(32, 109, 193, 0.35);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--navy);
  font-weight: 600;
}

/* ---------- Mobile ribbon ---------- */

.ribbon {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  padding-block: 10px calc(10px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 -10px 30px rgba(10, 37, 64, 0.14);
  transition: transform 200ms ease, visibility 200ms ease;
}

.ribbon.is-hidden {
  visibility: hidden;
  transform: translateY(110%);
}

.ribbon__inner {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ribbon p {
  display: grid;
  flex: 1 1 auto;
  min-width: 0;
  line-height: 1.3;
}

.ribbon strong {
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
}

.ribbon p > span {
  display: none;
  color: var(--muted);
  font-size: var(--text-sm);
}

.ribbon .button {
  flex: none;
  min-height: 46px;
  padding: 10px 14px;
  font: 700 0.8125rem / 1.2 var(--font-display);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

@media (min-width: 480px) {
  .ribbon p > span {
    display: block;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  padding-block: 40px;
  background: var(--navy);
  color: var(--on-blue);
  font-size: var(--text-sm);
}

.site-footer__inner {
  display: grid;
  gap: 20px;
}

.site-footer img {
  width: 132px;
}

.site-footer a {
  color: var(--white);
}

.site-footer__slogan {
  margin-top: 4px;
  color: var(--white);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- Breakpoints ---------- */

@media (min-width: 480px) {
  .choice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 768px) {
  body {
    padding-bottom: 0;
    font-size: var(--text-lg);
  }

  .wrap {
    padding-left: max(24px, env(safe-area-inset-left, 0px));
    padding-right: max(24px, env(safe-area-inset-right, 0px));
  }

  .band {
    padding-block: 96px;
  }

  .price-bar {
    position: sticky;
    top: env(safe-area-inset-top, 0px);
    z-index: 100;
  }

  .price-bar__full {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: center;
    gap: 2px 16px;
  }

  .price-bar__full > span:first-child,
  .price-bar__full > span:last-child {
    color: var(--blue-light);
  }

  .price-bar__amount strong {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 800;
  }

  .price-bar__compact {
    display: none;
  }

  .menu-toggle {
    display: none;
  }

  .main-nav {
    position: static;
    display: flex;
    padding: 0;
    gap: 4px;
    background: transparent;
    box-shadow: none;
  }

  .main-nav a {
    padding: 10px 12px;
    color: var(--white);
    font-size: var(--text-sm);
  }

  .main-nav a:hover {
    background: rgba(255, 255, 255, 0.12);
  }

  .brand-link img,
  .site-footer img {
    width: 150px;
  }

  .hero {
    padding-block: 72px 48px;
  }

  .problem-grid,
  .output-grid,
  .exchange,
  .audience__split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .persona-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .how__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    align-items: start;
    gap: 40px;
  }

  .price-card {
    position: sticky;
    top: 84px;
  }

  .founder__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    align-items: center;
    gap: 56px;
  }

  .photos {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .signup__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 48px;
  }

  .signup__head {
    position: sticky;
    top: 84px;
  }

  .signup__panel {
    padding: 32px;
  }

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

  .field--full,
  .honeypot {
    grid-column: 1 / -1;
  }

  .ribbon {
    right: auto;
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    width: min(1040px, calc(100% - 48px));
    padding-block: 16px;
    transform: translateX(-50%);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
  }

  .ribbon.is-hidden {
    transform: translate(-50%, 140%);
  }

  .ribbon__inner {
    gap: 24px;
  }

  .ribbon strong {
    font-size: 1.375rem;
  }

  .ribbon .button {
    min-height: 52px;
    padding: 14px 26px;
    font-size: 1rem;
  }

  .site-footer__inner {
    grid-template-columns: auto 1fr;
    align-items: center;
    text-align: right;
  }
}

@media (min-width: 640px) {
  .stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .stats li:last-child {
    grid-column: auto;
  }
}

@media (min-width: 1080px) {
  .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 56px;
  }

  .problem-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .skills__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 64px;
  }

  .skills .section-head {
    position: sticky;
    top: 84px;
  }
}

@media (min-width: 1200px) {
  .output-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .os-map {
    padding: 32px;
  }

  .os-map__grid {
    grid-template-columns: minmax(0, 1fr) 13rem;
    grid-template-areas:
      "stages finish"
      "base   finish";
    gap: 28px 32px;
  }

  .os-stages {
    grid-area: stages;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .os-base {
    grid-area: base;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }

  .os-base__tools {
    grid-column: auto;
    max-width: 17rem;
    justify-content: flex-end;
  }

  .os-base::after {
    display: none;
  }

  /* Arrow points right, toward the next stage / Demo Day */
  .os-stage::after {
    top: 50%;
    left: calc(100% + 7px);
    transform: translateY(-50%) rotate(-45deg);
  }

  /* Dashed link: each stage reads from the Second Brain below */
  .os-stage::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 100%;
    height: 28px;
    border-left: 2px dashed var(--blue-light);
  }

  .os-finish {
    grid-area: finish;
    align-content: center;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}