/* IFAC Workshop — Contextual Control */
:root {
  --ink: #0c1a2e;
  --ink-muted: #3d4f68;
  --surface: #f7f9fc;
  --card: #ffffff;
  --accent: #1a4b8c;
  --accent-soft: #e8f0fa;
  --accent-warm: #c45c26;
  --border: #d8e0eb;
  --radius: 10px;
  --shadow: 0 12px 40px rgba(12, 26, 46, 0.08);
  --font-serif: "Source Serif 4", "Georgia", serif;
  --font-sans: "Source Sans 3", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--surface);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-warm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 249, 252, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink);
  max-width: min(100%, 320px);
}

.brand:hover {
  color: var(--accent);
}

.brand:hover .brand-title {
  color: var(--accent);
}

.brand-mark {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand-kicker {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.brand-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  transition: color 0.15s ease;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
}

.nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-muted);
  text-decoration: none;
}

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

.hero {
  background: linear-gradient(160deg, #0c1a2e 0%, #1a3a5c 45%, #1a4b8c 100%);
  color: #f0f4fa;
  padding: 3.5rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 70% 0%, rgba(255, 255, 255, 0.12), transparent 55%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: 1rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.75rem, 4vw, 2.65rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
  max-width: 900px;
}

.hero-lead {
  font-size: 1.15rem;
  max-width: 720px;
  opacity: 0.92;
  margin: 0 0 1.75rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: 0.95rem;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-meta strong {
  font-weight: 600;
}

.hero-meta a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.45);
}

.hero-meta a:hover {
  color: #fff;
  text-decoration-color: #fff;
}

.subsection-title {
  font-size: 1.05rem;
  margin-top: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--ink);
}

.two-col .subsection-title:not(:first-child) {
  margin-top: 1.25rem;
}

.tight-bottom {
  margin-bottom: 0;
}

.btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.65rem 1.25rem;
  background: #fff;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius);
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  color: var(--ink);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

section {
  padding-top: 3.25rem;
  scroll-margin-top: 5rem;
}

section h2 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

section > p:first-of-type {
  margin-top: 0;
}

.lead {
  font-size: 1.1rem;
  color: var(--ink-muted);
}

.objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.obj-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}

.obj-card strong {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.topics-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.topics-list li {
  position: relative;
  padding: 1rem 1rem 1rem 3rem;
  margin-bottom: 0.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(12, 26, 46, 0.04);
}

.topics-list li::before {
  content: counter(topic, decimal-leading-zero);
  counter-increment: topic;
  position: absolute;
  left: 1rem;
  top: 1rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
}

.topics-list {
  counter-reset: topic;
}

.schedule {
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}

.schedule-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.schedule-row:last-child {
  border-bottom: none;
}

.schedule-row.break {
  background: var(--accent-soft);
}

.schedule-time {
  padding: 0.85rem 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  color: var(--accent);
  border-right: 1px solid var(--border);
}

.schedule-desc {
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.speaker-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  box-shadow: var(--shadow);
}

.speaker-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin: 0 0 0.35rem;
}

.speaker-card .affil {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin: 0 0 0.75rem;
}

.speaker-note {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  background: var(--accent-soft);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.org-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.org-card {
  background: var(--card);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.15rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  border: 1px solid var(--border);
  border-left-width: 4px;
  box-shadow: 0 4px 16px rgba(12, 26, 46, 0.04);
}

.org-card.main-contact {
  border-left-color: var(--accent-warm);
}

.org-card h3 {
  font-size: 1rem;
  margin: 0 0 0.25rem;
}

.org-card .uni {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin: 0 0 0.5rem;
}

.org-card a {
  font-size: 0.9rem;
  word-break: break-all;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--accent-warm);
  color: #fff;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  margin-left: 0.35rem;
  vertical-align: middle;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
  }

  .schedule-row {
    grid-template-columns: 1fr;
  }

  .schedule-time {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.35rem;
  }
}

.site-footer {
  margin-top: 3rem;
  padding: 2rem 1.5rem;
  background: var(--ink);
  color: #b8c5d9;
  text-align: center;
  font-size: 0.9rem;
}

.site-footer a {
  color: #e8f0fa;
}