:root {
  --navy: #07172b;
  --blue: #1877ff;
  --cyan: #61e2ff;
  --yellow: #ffdc5e;
  --ink: #102238;
  --muted: #68798b;
  --paper: #f4f7fb;
  --line: #dce5ef;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--paper);
  color: var(--ink);
}

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

.header {
  min-height: 75px;
  padding: 15px 6%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: white;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  color: var(--navy);
  font-weight: 900;
  font-size: 15px;
  white-space: nowrap;
}

.logo span {
  display: block;
  margin-top: 4px;
  color: var(--blue);
  font-size: 10px;
  letter-spacing: 2px;
}

nav {
  display: flex;
  gap: 25px;
  font-size: 13px;
  font-weight: bold;
  color: #506176;
}

nav a:hover {
  color: var(--blue);
}

.btn {
  display: inline-block;
  border: 0;
  border-radius: 30px;
  padding: 14px 20px;
  font-size: 13px;
  font-weight: bold;
  cursor: pointer;
  text-align: center;
}

.btn-dark {
  background: var(--navy);
  color: white;
}

.btn-blue {
  background: var(--blue);
  color: white;
}

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

.btn-yellow {
  background: var(--yellow);
  color: var(--navy);
}

.hero {
  padding: 75px 6%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
  background: linear-gradient(135deg, white, #eaf4ff);
}

.eyebrow {
  color: var(--blue);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.5px;
}

h1 {
  color: var(--navy);
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1;
  letter-spacing: -2px;
  margin: 25px 0;
}

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

.hero-content > p,
.participation-info > p {
  max-width: 520px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 28px 0;
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 25px;
}

.facts div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.facts strong {
  color: var(--navy);
  font-size: 15px;
}

.facts small,
.disclaimer,
.help-text {
  color: var(--muted);
  font-size: 10px;
  line-height: 1.6;
}

.disclaimer {
  display: block;
  margin-top: 20px;
}

.hero-card {
  padding: 20px;
  border-radius: 22px;
  color: white;
  background: linear-gradient(145deg, #07172b, #164b7b);
  box-shadow: 0 25px 60px #102e4d30;
}

.hero-card-top,
.hero-card-bottom,
.wall-top,
.wall-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 9px;
  font-weight: bold;
  letter-spacing: 1px;
  color: #b5cce2;
}

.hero-card-bottom {
  font-size: 12px;
  letter-spacing: 0;
}

.hero-card-bottom span {
  background: var(--yellow);
  color: var(--navy);
  padding: 8px 10px;
  border-radius: 50%;
}

.mini-wall {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  grid-auto-rows: 40px;
  gap: 4px;
  margin: 18px 0;
}

.mini-tile {
  border-radius: 4px;
  background: linear-gradient(135deg, var(--a), var(--b));
}

.mini-tile.wide {
  grid-column: span 2;
}

.mini-tile.tall {
  grid-row: span 2;
}

.mini-tile.reserved {
  grid-column: span 2;
  grid-row: span 2;
  display: grid;
  place-items: center;
  text-align: center;
  border: 2px dashed var(--yellow);
  color: var(--yellow);
  background: #102b48;
  font-size: 9px;
  font-weight: bold;
}

.section {
  padding: 80px 6%;
}

.section-title {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 40px;
}

.section-title h2,
.wall-heading h2,
.participation-info h2 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--navy);
  margin: 14px 0;
}

.section-title p,
.wall-heading p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

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

.step {
  background: white;
  border: 1px solid var(--line);
  border-radius: 17px;
  padding: 25px;
  position: relative;
}

.number {
  position: absolute;
  right: 20px;
  color: #aabbd0;
  font-weight: bold;
}

.step-icon {
  display: grid;
  place-items: center;
  width: 45px;
  height: 45px;
  border-radius: 12px;
  background: #e8f2ff;
  color: var(--blue);
  font-size: 22px;
  margin-bottom: 20px;
}

.step h3 {
  color: var(--navy);
}

.step p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.wall-section {
  background: var(--navy);
  color: white;
}

.wall-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 25px;
}

.wall-heading h2 {
  color: white;
}

.wall-heading p {
  color: #b5cce2;
}

.wall-heading .eyebrow {
  color: var(--cyan);
}

.wall-label {
  font-size: 10px;
  color: var(--yellow);
}

.wall-container {
  background: #102b48;
  border: 1px solid #34536f;
  border-radius: 17px;
  padding: 15px;
}

.pixel-wall {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-rows: clamp(27px, 4vw, 52px);
  gap: 4px;
  margin: 16px 0;
}

.pixel {
  display: grid;
  place-items: center;
  min-width: 0;
  overflow: hidden;
  padding: 3px;
  text-align: center;
  font-size: 10px;
  font-weight: bold;
  color: white;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--a), var(--b));
}

.pixel.reserved {
  grid-column: 5 / span 4;
  grid-row: 3 / span 2;
  border: 2px dashed var(--yellow);
  color: var(--yellow);
  background: #07172b;
  font-size: 10px;
}

.wall-bottom a {
  color: var(--yellow);
  font-size: 11px;
  font-weight: bold;
}

.wall-disclaimer {
  font-size: 11px;
  line-height: 1.7;
  color: #b5cce2;
}

.participation {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 7%;
  align-items: start;
}

.participation-info h2 {
  font-size: clamp(34px, 4vw, 48px);
}

.participation-info ul {
  padding-left: 20px;
  line-height: 2;
  font-size: 13px;
  font-weight: bold;
}

.cr7-card {
  display: flex;
  gap: 13px;
  padding: 17px;
  margin-top: 25px;
  background: #fff8df;
  border: 1px solid #f0dc87;
  border-radius: 14px;
}

.star {
  background: var(--yellow);
  color: #5e4800;
  padding: 10px;
  height: 35px;
  border-radius: 50%;
}

.cr7-card strong {
  color: #6d5200;
  font-size: 12px;
}

.cr7-card p {
  color: #806d2d;
  font-size: 11px;
  line-height: 1.6;
}

.advertiser-form {
  padding: 27px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 20px 50px #17395c0c;
}

.form-top {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  font-weight: bold;
  letter-spacing: 1px;
  color: var(--muted);
}

.demo-badge {
  color: #07855e;
}

.advertiser-form h3 {
  color: var(--navy);
  font-size: 23px;
  margin-bottom: 5px;
}

.form-intro {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
  margin-bottom: 20px;
}

.advertiser-form label {
  display: block;
  font-size: 11px;
  font-weight: bold;
  margin: 15px 0 7px;
}

.advertiser-form input:not([type="checkbox"]):not([type="file"]),
.advertiser-form select {
  width: 100%;
  padding: 12px;
  border: 1px solid #d7e0ea;
  border-radius: 9px;
  background: #fbfcfe;
  font-size: 12px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

#price {
  display: flex;
  align-items: center;
  min-height: 39px;
  padding: 10px;
  border-radius: 9px;
  background: #edf5ff;
  color: var(--blue);
  font-weight: bold;
  font-size: 13px;
}

.checkbox-label {
  display: flex !important;
  align-items: start;
  gap: 8px;
  line-height: 1.5;
  font-weight: normal !important;
}

.checkbox-label input {
  margin-top: 3px;
}

.submit-btn {
  width: 100%;
  margin-top: 15px;
}

.image-preview {
  margin-top: 12px;
}

.image-preview img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  display: block;
  margin-bottom: 8px;
}

.remove-btn {
  padding: 8px 12px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

#formMessage {
  font-size: 12px;
  line-height: 1.7;
}

.final-banner {
  margin: 0 6% 60px;
  padding: 35px;
  border-radius: 20px;
  background: linear-gradient(110deg, #0b2541, #1255a2);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.final-banner .eyebrow {
  color: var(--cyan);
}

.final-banner h2 {
  font-size: clamp(24px, 3vw, 35px);
  margin-bottom: 8px;
}

.final-banner p {
  font-size: 12px;
  color: #c5d8eb;
}

.footer {
  padding: 30px 6%;
  background: white;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
}

.footer p,
.footer small {
  color: var(--muted);
  font-size: 11px;
}

@media (max-width: 900px) {
  nav {
    display: none;
  }

  .hero,
  .participation {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 650px;
    width: 100%;
  }
}

@media (max-width: 600px) {
  .header {
    padding: 13px 5%;
  }

  .header .btn {
    padding: 11px;
    font-size: 10px;
  }

  .hero,
  .section {
    padding: 50px 5%;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .facts {
    gap: 15px;
  }

  .mini-wall {
    grid-auto-rows: 30px;
    gap: 3px;
  }

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

  .wall-container {
    padding: 9px;
  }

  .pixel-wall {
    grid-auto-rows: 28px;
    gap: 3px;
  }

  .pixel.reserved {
    font-size: 8px;
  }

  .wall-heading {
    align-items: start;
    flex-direction: column;
  }

  .advertiser-form {
    padding: 19px;
  }

  .final-banner {
    margin: 0 5% 40px;
    padding: 24px;
    align-items: start;
    flex-direction: column;
  }

  .footer {
    padding: 25px 5%;
  }
}
```css
.wall-section {
  padding: 70px 5%;
  background: #071426;
  color: #fff;
  text-align: center;
}

.section-heading h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin: 12px 0;
}

.section-heading p,
.wall-note {
  color: #b8c7da;
}

.eyebrow {
  color: #ffd447;
  font-weight: 800;
  letter-spacing: 2px;
}

.wall-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin: 28px 0;
}

.wall-info span {
  background: #12243d;
  border: 1px solid #304765;
  border-radius: 12px;
  padding: 14px 18px;
}

.wall-info strong {
  color: #ffd447;
}

.pixel-wall {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 5px;
  max-width: 900px;
  margin: 25px auto;
  padding: 12px;
  background: #0c1d32;
  border: 1px solid #304765;
  border-radius: 15px;
}

.pixel {
  aspect-ratio: 1;
  min-width: 0;
  border: 1px solid #38516d;
  border-radius: 4px;
  background: #1b3553;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}

.pixel:hover {
  background: #31577f;
  transform: scale(1.06);
}

.pixel.selected {
  background: #ffd447;
  border-color: #fff1a8;
}

.pixel.reserved {
  background: #53657a;
  cursor: not-allowed;
  border-color: #6f8195;
}

.pixel:focus-visible,
.wall-actions button:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.cr7-space {
  grid-column: span 4;
  grid-row: span 2;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  background: #193e61;
  border: 2px dashed #ffd447;
  border-radius: 8px;
  color: #ffd447;
  font-weight: 800;
  font-size: clamp(10px, 2vw, 16px);
  cursor: default;
}

.wall-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 25px 0;
}

.wall-actions button {
  border: 0;
  border-radius: 9px;
  padding: 14px 20px;
  font-weight: 800;
  cursor: pointer;
}

#clearSelection {
  background: #263b54;
  color: white;
}

#reserveSelection {
  background: #ffd447;
  color: #101827;
}

.reservation-summary {
  max-width: 650px;
  margin: 20px auto;
  line-height: 1.6;
}

@media (max-width: 600px) {
  .pixel-wall {
    gap: 3px;
    padding: 6px;
  }

  .wall-info {
    flex-direction: column;
  }
}