:root {
  /* Keysight-inspired palette — tweak here to fine-tune branding */
  --ks-red: #c4122f;
  --ks-red-dark: #9d0f26;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --line: #e2e2e6;
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --navy: #16223a;
  --radius: 8px;
  --maxw: 1160px;
  --font: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--ks-red); }

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 64px;
}
.brand { display: flex; align-items: center; }
.brand-logo { height: 26px; width: auto; display: block; }
.brand-eggplant {
  height: 30px;
  width: auto;
  display: block;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

/* Hero */
.hero {
  background:
    linear-gradient(120deg, rgba(22, 34, 58, 0.88) 0%, rgba(36, 51, 79, 0.78) 100%),
    url("../assets/headerimage.jpg") center / cover no-repeat;
  color: #fff;
  padding: 64px 0;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 13px;
  font-weight: 700;
  color: #ff9fb0;
  margin: 0 0 12px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 0 0 16px;
  max-width: 900px;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 20px);
  color: #e6ebf3;
  margin: 0 0 20px;
  max-width: 760px;
}
.hero-meta {
  font-size: 17px;
  color: #d6ddea;
  margin: 0;
  font-weight: 600;
}

/* Content layout */
.content { padding: 48px 0 64px; }
.content-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 48px;
  align-items: start;
}
.content-main h2 {
  font-size: 24px;
  margin: 32px 0 12px;
}
.content-main h2:first-child { margin-top: 0; }
.content-main p {
  color: var(--ink-soft);
  margin: 0 0 16px;
  font-size: 16px;
}

.section-lead {
  font-size: 18px;
  margin: 24px 0 10px;
  color: var(--ink);
}
.feature-list {
  margin: 0 0 20px;
  padding-left: 20px;
  color: var(--ink-soft);
}
.feature-list li {
  margin-bottom: 8px;
  font-size: 16px;
}

.topic { margin: 0 0 18px; }
.topic h3 {
  font-size: 17px;
  margin: 0 0 4px;
  color: var(--ink);
}
.topic p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-soft);
}

/* Presenters */
.presenters { display: grid; gap: 24px; }
.presenter { display: flex; gap: 16px; align-items: flex-start; }
.presenter-photo {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  object-fit: cover;
  flex: 0 0 auto;
  background: var(--bg-soft);
}
.presenter-photo.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  background: var(--ks-red);
  font-size: 24px;
}
.presenter-body h3 { margin: 0 0 2px; font-size: 18px; }
.presenter-role { margin: 0 0 8px; color: var(--ks-red); font-weight: 600; font-size: 14px; }
.presenter-body p { font-size: 15px; margin: 0; color: var(--ink-soft); }

/* Form card */
.content-aside { position: sticky; top: 88px; }
.form-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: #fff;
  box-shadow: 0 8px 30px rgba(20, 34, 58, 0.08);
}
.form-title { margin: 0 0 20px; font-size: 22px; }

.form-intro {
  margin: -8px 0 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

.field { margin-bottom: 16px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink);
}
.req { color: var(--ks-red); margin-left: 2px; }

.field input,
.field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--ks-red);
  box-shadow: 0 0 0 3px rgba(196, 18, 47, 0.12);
}
.field input.invalid,
.field select.invalid {
  border-color: var(--ks-red);
  background: #fff6f7;
}

/* Honeypot — visually hidden but present in DOM */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Consent */
.consent { margin-top: 4px; }
.checkbox {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-weight: 400 !important;
  font-size: 13px !important;
  color: var(--ink-soft);
  cursor: pointer;
}
.checkbox input { width: auto; margin-top: 3px; flex: 0 0 auto; }

.privacy-note {
  font-size: 12px;
  color: var(--ink-soft);
  margin: 4px 0 20px;
}

.btn-register {
  width: 100%;
  padding: 13px 16px;
  background: var(--ks-red);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-register:hover { background: var(--ks-red-dark); }
.btn-register:disabled { opacity: 0.6; cursor: not-allowed; }

.form-error {
  color: var(--ks-red);
  font-size: 14px;
  margin: 14px 0 0;
  font-weight: 600;
}

.form-success { text-align: center; padding: 20px 4px; }
.form-success h2 { color: var(--ks-red); margin: 0 0 12px; }
.form-success p { color: var(--ink-soft); margin: 0; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 20px 0;
  margin-top: 24px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--ink-soft);
  flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 900px) {
  .content-grid { grid-template-columns: 1fr; }
  .content-aside { position: static; }
}
@media (max-width: 480px) {
  .field-row { grid-template-columns: 1fr; }
}