:root {
  --ink: #071c47;
  --muted: #3e4d69;
  --paper: #f8faf8;
  --white: #ffffff;
  --teal: #1f7c2f;
  --teal-dark: #145f24;
  --blue: #071c47;
  --line: #dbe5e2;
  --gold: #1f7c2f;
  --shadow: 0 18px 60px rgba(7, 28, 71, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

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

a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
[tabindex]:focus {
  outline: 3px solid #f5c542;
  outline-offset: 4px;
  box-shadow: 0 0 0 7px rgba(7, 28, 71, 0.88);
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
textarea:focus:not(:focus-visible),
[tabindex]:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid #f5c542;
  outline-offset: 4px;
  box-shadow: 0 0 0 7px rgba(7, 28, 71, 0.88);
}

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

.skip-link {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 100;
  transform: translateY(-140%);
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--white);
  background: var(--ink);
  box-shadow: var(--shadow);
  font-weight: 800;
  transition: transform 160ms ease;
}

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

#main-content,
#event,
#audience,
#program,
#speakers,
#sponsorship,
#interest,
#abstract-content {
  scroll-margin-top: 92px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 4vw, 56px);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 1px 0 rgba(7, 28, 71, 0.08);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

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

.brand em {
  color: var(--teal);
  font-style: normal;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  font-size: 0.92rem;
  font-weight: 650;
}

.nav-links a {
  opacity: 0.86;
}

.nav-links a:hover {
  opacity: 1;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0;
  width: 46px;
  min-height: 44px;
  padding: 0;
  border: 1px solid rgba(7, 28, 71, 0.18);
  border-radius: 12px;
  color: var(--ink);
  background: var(--white);
  cursor: pointer;
  font: inherit;
  box-shadow: 0 10px 28px rgba(7, 28, 71, 0.08);
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.menu-toggle:hover,
.menu-toggle[aria-expanded="true"] {
  border-color: var(--ink);
  color: var(--white);
  background: var(--ink);
}

.menu-toggle-icon {
  display: grid;
  gap: 6px;
}

.menu-toggle-icon span {
  display: block;
  width: 21px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 820px;
  display: grid;
  align-items: center;
  justify-items: center;
  overflow: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 18%, rgba(31, 124, 47, 0.08), transparent 28%),
    radial-gradient(circle at 86% 22%, rgba(7, 28, 71, 0.08), transparent 24%),
    var(--white);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding-top: 86px;
  text-align: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow.dark,
.section-kicker {
  color: var(--teal);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 24px;
  font-size: clamp(3.2rem, 7vw, 6.7rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

h1 span {
  color: var(--teal);
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.08rem;
}

.hero-copy {
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.8vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.hero-pillars svg {
  width: 100%;
  height: 100%;
}

.hero-pillars circle,
.hero-pillars path {
  fill: none;
  stroke: currentColor;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-rule {
  width: 86px;
  height: 4px;
  margin: -2px auto 26px;
  border-radius: 999px;
  background: var(--teal);
}

.hero-pillars {
  width: min(700px, 100%);
  margin: 52px auto 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
}

.hero-pillars div {
  display: grid;
  justify-items: center;
  gap: 12px;
  padding: 0 28px;
  color: var(--ink);
}

.hero-pillars div + div {
  border-left: 1px solid rgba(7, 28, 71, 0.18);
}

.hero-pillars svg {
  width: 58px;
  height: 58px;
}

.hero-pillars strong {
  color: var(--teal);
  font-size: 0.9rem;
  font-weight: 850;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 0 22px;
  border: 1px solid transparent;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease, border 160ms ease;
}

button,
.button {
  cursor: pointer;
}

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

.button-primary {
  color: var(--white);
  background: var(--teal);
}

.button-primary:hover {
  background: var(--teal-dark);
}

.button-secondary {
  color: var(--ink);
  border-color: rgba(7, 28, 71, 0.24);
  background: var(--white);
}

.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(72px, 10vw, 132px) 0;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1fr);
  gap: clamp(28px, 6vw, 84px);
  align-items: start;
}

.intro-grid p,
.program-copy p,
.cta-copy p {
  color: var(--muted);
  font-size: 1.1rem;
}

.event-band {
  padding: 0 20px;
}

.event-panel {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(28px, 6vw, 74px);
  align-items: center;
  padding: clamp(32px, 6vw, 70px);
  color: var(--white);
  border-radius: 8px;
  background: linear-gradient(135deg, #071c47 0%, #12356d 58%, #1f7c2f 100%);
  box-shadow: var(--shadow);
}

.event-panel p {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.08rem;
}

.event-details {
  margin: 0;
  display: grid;
  gap: 12px;
}

.event-details div {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
}

.event-details dt {
  color: rgba(255, 255, 255, 0.64);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.event-details dd {
  margin: 5px 0 0;
  font-size: 1.08rem;
  font-weight: 750;
}

.section-heading {
  max-width: 800px;
  margin-bottom: 38px;
}

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

.audience-grid article {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.audience-grid p,
.program-list p,
.form-note {
  color: var(--muted);
}

.program {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(320px, 1.15fr);
  gap: clamp(34px, 7vw, 92px);
  align-items: start;
}

.program-list {
  display: grid;
  gap: 14px;
}

.program-list div {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 8px 18px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.program-list div:last-child {
  border-bottom: 1px solid var(--line);
}

.program-list span {
  grid-row: span 2;
  color: var(--gold);
  font-weight: 850;
}

.program-list strong {
  font-size: 1.2rem;
}

.program-list p {
  margin: 0;
}

.speaker-call {
  padding-top: 0;
}

.speaker-call .section-heading p {
  max-width: 820px;
  color: var(--muted);
  font-size: 1.1rem;
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.speaker-grid article {
  min-height: 235px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.speaker-grid span {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.speaker-grid p {
  color: var(--muted);
}

.speaker-cta {
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 24px;
  border-radius: 8px;
  color: var(--white);
  background: linear-gradient(135deg, #102127 0%, #174a63 100%);
}

.speaker-cta strong {
  font-size: 1.08rem;
}

.sponsorship {
  padding-top: 0;
}

.sponsorship-panel {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(320px, 1fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
  padding: clamp(34px, 6vw, 72px);
  border: 1px solid rgba(12, 124, 120, 0.18);
  border-radius: 8px;
  background:
    radial-gradient(circle at top right, rgba(216, 166, 61, 0.18), transparent 34%),
    linear-gradient(135deg, #ffffff 0%, #eef7f5 100%);
  box-shadow: var(--shadow);
}

.sponsorship-copy p {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.1rem;
}

.sponsor-options {
  display: grid;
  gap: 14px;
}

.sponsor-options article {
  padding: 22px;
  border: 1px solid rgba(12, 124, 120, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
}

.sponsor-options span {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--teal);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sponsor-options p {
  margin-bottom: 0;
  color: var(--muted);
}

.cta-band {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto clamp(54px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(320px, 1fr);
  gap: clamp(28px, 6vw, 74px);
  align-items: start;
  padding: clamp(34px, 6vw, 72px);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

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

.field-row {
  display: grid;
  gap: 7px;
}

label {
  font-size: 0.9rem;
  font-weight: 750;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fbfcfc;
  font: inherit;
}

input,
select {
  min-height: 48px;
  padding: 0 13px;
}

textarea {
  min-height: 130px;
  padding: 13px;
  resize: vertical;
}

select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 46px;
  background:
    linear-gradient(45deg, transparent 50%, var(--teal) 50%) calc(100% - 22px) 21px / 7px 7px no-repeat,
    linear-gradient(135deg, var(--teal) 50%, transparent 50%) calc(100% - 17px) 21px / 7px 7px no-repeat,
    linear-gradient(90deg, transparent, transparent calc(100% - 42px), rgba(12, 124, 120, 0.12) calc(100% - 42px), rgba(12, 124, 120, 0.12)) 0 0 / 100% 100% no-repeat,
    #fbfcfc;
  cursor: pointer;
}

select:hover {
  border-color: rgba(12, 124, 120, 0.46);
  background-color: var(--white);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--teal);
}

.hidden-field {
  position: absolute;
  left: -100vw;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-button {
  width: 100%;
  border: 0;
  cursor: pointer;
  font: inherit;
}

.form-note {
  margin: 0;
  font-size: 0.92rem;
}

.form-message {
  padding: 12px 14px;
  border-radius: 8px;
  font-weight: 700;
}

.form-message.success {
  color: #0b4d36;
  background: #e4f6ee;
}

.form-message.error {
  color: #8b1d1d;
  background: #ffe9e9;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 30px clamp(20px, 4vw, 56px);
  color: rgba(255, 255, 255, 0.76);
  background: #0b2026;
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

.site-footer div {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.social-link {
  display: inline-grid;
  width: 28px;
  height: 28px;
  place-items: center;
  color: rgba(255, 255, 255, 0.86);
  transition: color 160ms ease, transform 160ms ease;
}

.social-link:hover {
  color: var(--white);
  transform: translateY(-1px);
}

.social-link svg {
  width: 22px;
  height: 22px;
}

.social-link rect,
.social-link circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

@media (max-width: 900px) {
  .site-header {
    align-items: center;
    gap: 14px;
  }

  .menu-toggle {
    display: inline-grid;
  }

  .nav-links {
    position: absolute;
    top: calc(100% + 8px);
    left: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid rgba(7, 28, 71, 0.12);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top center;
    visibility: hidden;
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
  }

  .site-header.is-menu-open .nav-links {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
    visibility: visible;
  }

  .nav-links a {
    padding: 13px 12px;
    border-radius: 8px;
    opacity: 0;
    transform: translateY(-4px);
    transition: background 160ms ease, opacity 180ms ease, transform 180ms ease;
  }

  .site-header.is-menu-open .nav-links a {
    opacity: 1;
    transform: translateY(0);
  }

  .site-header.is-menu-open .nav-links a:nth-child(2) {
    transition-delay: 25ms;
  }

  .site-header.is-menu-open .nav-links a:nth-child(3) {
    transition-delay: 50ms;
  }

  .site-header.is-menu-open .nav-links a:nth-child(4) {
    transition-delay: 75ms;
  }

  .site-header.is-menu-open .nav-links a:nth-child(5) {
    transition-delay: 100ms;
  }

  .site-header.is-menu-open .nav-links a:nth-child(6) {
    transition-delay: 125ms;
  }

  .site-header.is-menu-open .nav-links a:nth-child(7) {
    transition-delay: 150ms;
  }

  .nav-links a:hover {
    background: #eef8f0;
  }

  .hero {
    min-height: 700px;
  }

  .hero-content {
    margin: 0 auto;
    padding-top: 92px;
  }

  .intro-grid,
  .event-panel,
  .program,
  .sponsorship-panel,
  .cta-band {
    grid-template-columns: 1fr;
  }

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

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

  .speaker-cta {
    display: grid;
  }

  .hero-pillars {
    max-width: 420px;
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .hero-pillars div {
    padding: 0;
  }

  .hero-pillars div + div {
    padding-top: 22px;
    border-top: 1px solid rgba(7, 28, 71, 0.18);
    border-left: 0;
  }
}

@media (max-width: 620px) {
  .hero {
    min-height: 760px;
  }

  h1 {
    font-size: 3.05rem;
  }

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

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

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

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

  .program-list span {
    grid-row: auto;
  }

  .site-footer {
    display: grid;
  }
}

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

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

.abstract-page {
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 12%, rgba(31, 124, 47, 0.1), transparent 30%),
    radial-gradient(circle at 86% 18%, rgba(7, 28, 71, 0.08), transparent 28%),
    var(--paper);
}

.abstract-shell {
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding: 126px 0 42px;
}

.abstract-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.abstract-card {
  padding: clamp(28px, 6vw, 58px);
}

.abstract-card h1 {
  margin-left: 0;
  margin-right: 0;
}

.abstract-lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.08rem;
}

.abstract-info-panel {
  max-width: 780px;
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 5px solid var(--teal);
  border-radius: 8px;
  background: #eef8f0;
}

.abstract-info-panel p {
  margin: 0;
  color: var(--ink);
  font-weight: 650;
}

.abstract-details {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.abstract-details span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid rgba(31, 124, 47, 0.18);
  border-radius: 999px;
  color: var(--teal-dark);
  background: #eef8f0;
  font-size: 0.86rem;
  font-weight: 800;
}

.abstract-card .form-message {
  margin-top: 26px;
}

.abstract-form {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.field-row label span,
.field-help {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.field-help {
  margin: 0;
}

.is-over-limit {
  color: #8b1d1d;
  font-weight: 800;
}

.checkbox-row {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 12px;
  align-items: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
}

.checkbox-row input {
  width: 18px;
  min-height: 18px;
  margin: 3px 0 0;
  accent-color: var(--teal);
}

.checkbox-row label {
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
}

@media (max-width: 620px) {
  .abstract-shell {
    padding-top: 112px;
  }
}