/* ==========================================================================
   Marketing Technology Live London — Main Stylesheet
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-black: #1a1a1a;
  --color-red: #E8333A;
  --color-red-dark: #c42a30;
  --color-red-light: #ff4d54;
  --color-white: #ffffff;
  --color-grey-light: #f5f5f5;
  --color-grey-mid: #cccccc;
  --color-grey-dark: #333333;
  --color-grey-darker: #222222;
  --color-overlay: rgba(26, 26, 26, 0.95);

  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Source Sans 3', 'Source Sans Pro', sans-serif;

  --max-width: 1200px;
  --section-padding: 100px 0;
  --section-padding-mobile: 60px 0;
  --nav-height: 72px;

  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.2);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-black);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-red);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-red-dark);
}

a:focus-visible {
  outline: 3px solid var(--color-red);
  outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--color-black);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); }

p {
  margin: 0 0 1.25em;
}

ul, ol {
  padding-left: 1.5em;
}

/* ---------- Skip link (a11y) ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 12px 24px;
  background: var(--color-red);
  color: var(--color-white);
  font-weight: 700;
  border-radius: 0 0 4px 4px;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Section base ---------- */
.section {
  padding: var(--section-padding);
}

.section--dark {
  background-color: var(--color-black);
  color: var(--color-white);
}

.section--dark h2,
.section--dark h3 {
  color: var(--color-white);
}

.section--light {
  background-color: var(--color-white);
  color: var(--color-black);
}

.section--grey {
  background-color: var(--color-grey-light);
  color: var(--color-black);
}

.section__header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
}

.section__header p {
  font-size: 1.125rem;
  opacity: 0.85;
}

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }
.reveal--delay-5 { transition-delay: 0.5s; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 36px;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 52px;
  min-width: 44px;
}

.btn:focus-visible {
  outline: 3px solid var(--color-red-light);
  outline-offset: 2px;
}

.btn--primary {
  background-color: var(--color-red);
  color: var(--color-white);
  border-color: var(--color-red);
}

.btn--primary:hover {
  background-color: var(--color-red-dark);
  border-color: var(--color-red-dark);
  color: var(--color-white);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn--outline:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

.btn--outline-dark {
  background-color: transparent;
  color: var(--color-black);
  border-color: var(--color-black);
}

.btn--outline-dark:hover {
  background-color: var(--color-black);
  color: var(--color-white);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color var(--transition-medium), box-shadow var(--transition-medium);
}

.nav--transparent {
  background-color: transparent;
}

.nav--solid {
  background-color: var(--color-overlay);
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav__logo img {
  height: 40px;
  width: auto;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

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

.nav__cta {
  padding: 10px 24px;
  font-size: 0.8125rem;
  min-height: 44px;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav__toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  position: relative;
  transition: background-color var(--transition-fast);
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-fast);
}

.nav__toggle-icon::before { top: -7px; }
.nav__toggle-icon::after { top: 7px; }

/* Hamburger open state */
.nav__toggle--open .nav__toggle-icon {
  background-color: transparent;
}

.nav__toggle--open .nav__toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav__toggle--open .nav__toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

/* Mobile nav */
.nav__menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--color-black);
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(232, 51, 58, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(232, 51, 58, 0.05) 0%, transparent 50%);
  z-index: 1;
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 80px),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 80px);
}

.hero__content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  max-width: 800px;
}

.hero__logo {
  width: 360px;
  max-width: 90%;
  margin-bottom: 32px;
}

.hero__title {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--color-white);
}

.hero__title span {
  color: var(--color-red);
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.7;
  opacity: 0.85;
  margin-bottom: 16px;
  max-width: 650px;
}

.hero__date {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  color: var(--color-red);
}

.hero__colocation {
  font-size: 0.9375rem;
  opacity: 0.7;
  margin-bottom: 32px;
}

.hero__colocation a {
  color: var(--color-white);
  text-decoration: underline;
  text-decoration-color: rgba(255,255,255,0.3);
}

.hero__colocation a:hover {
  text-decoration-color: var(--color-red);
  color: var(--color-red);
}

/* ---------- Stats bar ---------- */
.stats {
  background-color: var(--color-grey-darker);
  padding: 60px 0;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
  color: var(--color-white);
}

.stats__item {
  padding: 16px;
}

.stats__number {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-red);
  line-height: 1.2;
  margin-bottom: 8px;
}

.stats__label {
  font-size: 0.9375rem;
  opacity: 0.8;
  line-height: 1.4;
}

.stats__intro {
  text-align: center;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
  margin-bottom: 40px;
  color: var(--color-white);
}

.stats__intro a {
  color: var(--color-white);
  text-decoration: underline;
  text-decoration-color: rgba(255,255,255,0.3);
}

.stats__intro a:hover {
  color: var(--color-red);
  text-decoration-color: var(--color-red);
}

/* ---------- About section ---------- */
.about__content {
  max-width: 800px;
  margin: 0 auto;
}

.about__content p {
  font-size: 1.0625rem;
}

.about__credibility {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-grey-mid);
  font-size: 0.9375rem;
  color: var(--color-grey-dark);
}

.about__credibility img {
  height: 28px;
  width: auto;
}

/* ---------- Who attends ---------- */
.audience__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 60px;
}

.audience__card {
  text-align: center;
  padding: 40px 24px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  transition: border-color var(--transition-fast);
}

.audience__card:hover {
  border-color: var(--color-red);
}

.audience__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background-color: rgba(232, 51, 58, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.audience__card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.audience__card p {
  font-size: 0.9375rem;
  opacity: 0.7;
  margin: 0;
}

.logo-wall__title {
  text-align: center;
  font-size: 0.9375rem;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 32px;
}

.logo-wall__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.logo-wall__card {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 160px;
  height: 100px;
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo-wall__card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.logo-wall__logo {
  height: auto;
  width: auto;
  max-height: 60px;
  max-width: 120px;
  object-fit: contain;
}

/* ---------- Themes ---------- */
.themes__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.theme__card {
  padding: 32px;
  border: 1px solid var(--color-grey-mid);
  border-radius: 8px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.theme__card:hover {
  border-color: var(--color-red);
  box-shadow: var(--shadow-md);
}

.theme__number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-red);
  line-height: 1;
  margin-bottom: 16px;
}

.theme__card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.theme__card p {
  font-size: 0.9375rem;
  opacity: 0.7;
  margin: 0;
  line-height: 1.6;
}

/* ---------- Why exhibit / Sponsorship promo ---------- */
.promo__content {
  max-width: 800px;
  margin: 0 auto;
}

.promo__benefits {
  list-style: none;
  padding: 0;
  margin: 32px 0;
}

.promo__benefits li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 20px;
  font-size: 1.0625rem;
  line-height: 1.6;
}

.promo__benefits li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  background-color: var(--color-red);
  border-radius: 3px;
}

.section--dark .promo__benefits li::before {
  background-color: var(--color-red);
}

/* ---------- Venue ---------- */
.venue__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.venue__info h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.venue__address {
  font-style: normal;
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 24px;
}

.venue__map {
  width: 100%;
  height: 400px;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--color-grey-light);
}

.venue__map iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* ---------- Register form ---------- */
.register {
  padding: var(--section-padding);
  background-color: var(--color-black);
  color: var(--color-white);
}

.register__form {
  max-width: 640px;
  margin: 0 auto;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form__group {
  margin-bottom: 20px;
}

.form__group--full {
  grid-column: 1 / -1;
}

.form__label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  color: var(--color-white);
}

.form__label--required::after {
  content: ' *';
  color: var(--color-red);
}

.form__input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  font-family: var(--font-body);
  color: var(--color-black);
  background-color: var(--color-white);
  border: 2px solid transparent;
  border-radius: 4px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input:focus {
  outline: none;
  border-color: var(--color-red);
  box-shadow: 0 0 0 3px rgba(232, 51, 58, 0.2);
}

.form__input::placeholder {
  color: var(--color-grey-mid);
}

.form__checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

.form__checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.9375rem;
}

.form__checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-red);
  cursor: pointer;
}

.form__consent {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 28px 0;
  font-size: 0.875rem;
  line-height: 1.5;
  opacity: 0.8;
}

.form__consent input[type="checkbox"] {
  margin-top: 3px;
  min-width: 20px;
  min-height: 20px;
  accent-color: var(--color-red);
  cursor: pointer;
}

.register__form-wrapper {
  max-width: 640px;
  margin: 0 auto;
}

.register__form-wrapper iframe {
  width: 100%;
  min-height: 305px;
  border: 0;
}

.form__submit {
  width: 100%;
  padding: 18px 36px;
  font-size: 1.0625rem;
}

.form__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ---------- FAQ ---------- */
.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-grey-mid);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 24px 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-black);
  line-height: 1.4;
  min-height: 44px;
}

.faq__question:hover {
  color: var(--color-red);
}

.faq__question:focus-visible {
  outline: 3px solid var(--color-red);
  outline-offset: 2px;
}

.faq__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  margin-left: 16px;
  position: relative;
  transition: transform var(--transition-fast);
}

.faq__icon::before,
.faq__icon::after {
  content: '';
  position: absolute;
  background-color: var(--color-black);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.faq__icon::before {
  top: 50%;
  left: 0;
  width: 24px;
  height: 2px;
  transform: translateY(-50%);
}

.faq__icon::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 24px;
  transform: translateX(-50%);
}

.faq__question:hover .faq__icon::before,
.faq__question:hover .faq__icon::after {
  background-color: var(--color-red);
}

.faq__item--open .faq__icon::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-medium);
}

.faq__answer-inner {
  padding: 0 0 24px;
  font-size: 1rem;
  line-height: 1.7;
  opacity: 0.8;
}

/* ---------- Footer ---------- */
.footer {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 80px 0 40px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer__brand img {
  height: 36px;
  margin-bottom: 20px;
}

.footer__brand p {
  font-size: 0.9375rem;
  opacity: 0.7;
  max-width: 300px;
}

.footer__heading {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-white);
  margin-bottom: 20px;
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__links li {
  margin-bottom: 12px;
}

.footer__links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-red);
}

.footer__social {
  display: flex;
  gap: 16px;
  margin-top: 20px;
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--color-white);
  transition: all var(--transition-fast);
}

.footer__social a:hover {
  border-color: var(--color-red);
  background-color: var(--color-red);
  color: var(--color-white);
}

.footer__social svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Social icons on light backgrounds (e.g. contact page Follow Us) */
.content-section .footer__social a {
  color: var(--color-black);
  border-color: rgba(0,0,0,0.2);
}

.content-section .footer__social a:hover {
  border-color: var(--color-red);
  background-color: var(--color-red);
  color: var(--color-white);
}

.footer__colocation {
  font-size: 0.875rem;
  opacity: 0.6;
  margin-top: 12px;
}

.footer__colocation a {
  color: rgba(255,255,255,0.7);
  text-decoration: underline;
}

.footer__colocation a:hover {
  color: var(--color-red);
}

.footer__bottom {
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
  opacity: 0.5;
}

.footer__bottom a {
  color: rgba(255,255,255,0.7);
}

.footer__bottom a:hover {
  color: var(--color-red);
}

.footer__legal-links {
  display: flex;
  gap: 24px;
}

/* ---------- Page header (inner pages) ---------- */
.page-header {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 160px 0 80px;
  text-align: center;
}

.page-header h1 {
  color: var(--color-white);
  margin-bottom: 16px;
}

.page-header p {
  font-size: 1.125rem;
  opacity: 0.8;
  max-width: 700px;
  margin: 0 auto;
}

/* ---------- Content page ---------- */
.content-section {
  padding: 80px 0;
}

.content-section + .content-section {
  padding-top: 0;
}

/* Restore padding when background colour changes between adjacent sections */
.content-section.section--light + .content-section.section--grey,
.content-section.section--grey + .content-section.section--light {
  padding-top: 80px;
}

.content-body {
  max-width: 800px;
  margin: 0 auto;
}

.content-body h2 {
  margin-top: 48px;
  margin-bottom: 20px;
}

.content-body h3 {
  margin-top: 32px;
  margin-bottom: 12px;
}

.content-body ul li,
.content-body ol li {
  margin-bottom: 8px;
}

/* ---------- Exhibit / Sponsor page specifics ---------- */
.benefits__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin: 48px 0;
}

.benefit__card {
  padding: 32px;
  background-color: var(--color-grey-light);
  border-radius: 8px;
  border-left: 4px solid var(--color-red);
}

.benefit__card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.benefit__card p {
  font-size: 0.9375rem;
  margin: 0;
  opacity: 0.8;
}

/* Audience breakdown bar chart */
.breakdown__list {
  max-width: 600px;
  margin: 40px auto;
}

.breakdown__item {
  margin-bottom: 20px;
}

.breakdown__label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.breakdown__bar {
  height: 8px;
  background-color: var(--color-grey-light);
  border-radius: 4px;
  overflow: hidden;
}

.breakdown__fill {
  height: 100%;
  background-color: var(--color-red);
  border-radius: 4px;
  transition: width 1s ease;
}

/* Sponsorship tiers */
.tiers__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 48px 0;
}

.tier__card {
  padding: 32px;
  border: 1px solid var(--color-grey-mid);
  border-radius: 8px;
  text-align: center;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tier__card:hover {
  border-color: var(--color-red);
  box-shadow: var(--shadow-md);
}

.tier__card h3 {
  margin-bottom: 12px;
}

.tier__card p {
  font-size: 0.9375rem;
  opacity: 0.7;
  margin: 0;
}

/* ---------- Contact page ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  max-width: 800px;
  margin: 0 auto;
}

.contact__grid--3col {
  grid-template-columns: repeat(3, 1fr);
  max-width: 100%;
}

.contact__card {
  padding: 32px;
  background-color: var(--color-grey-light);
  border-radius: 8px;
}

.contact__card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-red);
}

.contact__card a {
  font-size: 0.9375rem;
  word-break: break-all;
}

/* ---------- Legal pages ---------- */
.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 80px 0;
}

.legal-content h1 {
  margin-bottom: 8px;
}

.legal-content .legal-date {
  font-size: 0.875rem;
  opacity: 0.6;
  margin-bottom: 48px;
}

.legal-content h2 {
  font-size: 1.25rem;
  margin-top: 40px;
}

.legal-content p,
.legal-content li {
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ---------- CTA banner (reusable) ---------- */
.cta-banner {
  text-align: center;
  padding: 80px 0;
  background-color: var(--color-red);
  color: var(--color-white);
}

.cta-banner h2 {
  color: var(--color-white);
  margin-bottom: 16px;
}

.cta-banner p {
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

.cta-banner .btn--outline {
  border-color: var(--color-white);
  color: var(--color-white);
}

.cta-banner .btn--outline:hover {
  background-color: var(--color-white);
  color: var(--color-red);
}

/* ---------- Speaker formats ---------- */
.formats__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin: 40px 0;
}

.format__card {
  text-align: center;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-grey-mid);
  border-radius: 8px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.format__card:hover {
  border-color: var(--color-red);
  box-shadow: var(--shadow-sm);
}

.format__card h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.format__card p {
  font-size: 0.875rem;
  opacity: 0.6;
  margin: 0;
}

/* ---------- Responsive ---------- */

/* Tablet (768px) */
@media (max-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

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

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

  .venue__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
  }

  body {
    font-size: 16px;
  }

  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-overlay);
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 24px;
    gap: 0;
    transform: translateX(100%);
    transition: transform var(--transition-medium);
    overflow-y: auto;
  }

  .nav__menu--open {
    transform: translateX(0);
  }

  .nav__links {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .nav__links li {
    width: 100%;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .nav__links a {
    display: block;
    padding: 16px 0;
    font-size: 1rem;
  }

  .nav__cta {
    margin-top: 24px;
    width: 100%;
    text-align: center;
  }

  .nav__toggle {
    display: flex;
  }

  .hero__content {
    text-align: center;
  }

  .hero__logo {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .btn-group {
    justify-content: center;
  }

  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .audience__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

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

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

  .contact__grid,
  .contact__grid--3col {
    grid-template-columns: 1fr;
  }

  .section__header {
    margin-bottom: 40px;
  }
}

@media (max-width: 480px) {
  .stats__grid {
    grid-template-columns: 1fr;
  }

  .hero__logo {
    width: 260px;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn-group .btn {
    width: 100%;
  }
}