/* ==========================================================================
   Conference Site — Main Stylesheet
   Dark theme, cyan/blue accents, professional minimalist
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-bg: #0a0c14;
  --color-bg-card: #0f1119;
  --color-bg-secondary: #161826;
  --color-fg: #dde2eb;
  --color-fg-muted: #6b7894;
  --color-primary: #00d4ff;
  --color-primary-fg: #0a0c14;
  --color-border: #1e2236;
  --color-destructive: #ef4444;
  --color-tag-plenary: rgba(0, 212, 255, 0.15);
  --color-tag-report: rgba(59, 130, 246, 0.15);
  --color-tag-workshop: rgba(45, 180, 140, 0.15);
  --color-tag-roundtable: rgba(100, 110, 200, 0.15);
  --color-tag-section: rgba(50, 160, 220, 0.15);
  --color-tag-discussion: rgba(0, 212, 255, 0.25);
  --radius: 0.5rem;
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --transition: 200ms ease;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-fg);
}

h1 { font-size: clamp(1.75rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.125rem; }

.text-primary { color: var(--color-primary); }
.text-muted { color: var(--color-fg-muted); }
.text-center { text-align: center; }
.text-balance { text-wrap: balance; }
.text-upper { text-transform: uppercase; }
.font-mono { font-family: var(--font-mono); }
.font-semibold { font-weight: 600; }

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.section-desc {
  margin-top: 1rem;
  color: var(--color-fg-muted);
  max-width: 40rem;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Layout ---------- */
.container {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
  border-top: 1px solid var(--color-border);
}

.section--alt {
  background-color: var(--color-bg-card);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Flex / Grid helpers ---------- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.flex-1 { flex: 1; }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Button ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 2rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  transition: opacity var(--transition), background-color var(--transition), border-color var(--transition);
  white-space: nowrap;
  line-height: 1.4;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-fg);
}
.btn--primary:hover { opacity: 0.88; }

.btn--secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-fg);
  border: 1px solid var(--color-border);
}
.btn--secondary:hover {
  border-color: rgba(0, 212, 255, 0.4);
  background-color: rgba(30, 34, 54, 0.8);
}

.btn--ghost {
  background: transparent;
  color: var(--color-fg-muted);
  padding: 0.5rem 1.25rem;
}
.btn--ghost:hover { color: var(--color-primary); }

.btn:disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---------- Card ---------- */
.card {
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  padding: 1.5rem;
  transition: border-color var(--transition);
}
.card:hover {
  border-color: rgba(0, 212, 255, 0.35);
}

.card--highlight {
  border-color: rgba(0, 212, 255, 0.3);
  background-color: rgba(0, 212, 255, 0.04);
}

/* ---------- Icon box ---------- */
.icon-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius);
  background-color: rgba(0, 212, 255, 0.1);
  flex-shrink: 0;
}

.icon-box svg {
  width: 1.25rem;
  height: 1.25rem;
  stroke: var(--color-primary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Badge / Tag ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 9999px;
  border: 1px solid var(--color-border);
  background-color: rgba(22, 24, 38, 0.5);
  padding: 0.375rem 1rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-fg-muted);
  backdrop-filter: blur(8px);
  line-height: 1;
  margin-bottom: 1rem;
}

.badge__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.tag--plenary { background: var(--color-tag-plenary); color: var(--color-primary); }
.tag--report { background: var(--color-tag-report); color: #6b9eef; }
.tag--workshop { background: var(--color-tag-workshop); color: #4ec8a0; }
.tag--roundtable { background: var(--color-tag-roundtable); color: #8b94d4; }
.tag--section { background: var(--color-tag-section); color: #50b8e0; }
.tag--discussion { background: var(--color-tag-discussion); color: var(--color-primary); }

/* ---------- NAVIGATION ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  transition: background-color 0.3s, border-color 0.3s, backdrop-filter 0.3s;
}

.nav--scrolled {
  background-color: rgba(10, 12, 20, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: 80rem;
  margin: 0 auto;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav__logo-image {
  width: 2.75rem;
  height: 2.75rem;
  object-fit: contain;
  flex: 0 0 auto;
}

.nav__logo-icon {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  text-align: center;
}

.nav__logo-text {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.nav__links {
  display: none;
  gap: 1.5rem;
}

.nav__links a {
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  transition: color var(--transition);
}
.nav__links a:hover {
  color: var(--color-primary);
}

.nav__cta {
  display: none;
}

.nav__toggle {
  display: flex;
  padding: 0.5rem;
}

.nav__toggle svg {
  width: 1.5rem;
  height: 1.5rem;
}

.nav__mobile {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.5rem;
  background-color: rgba(10, 12, 20, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__mobile.is-open { display: flex; }

.nav__mobile a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  transition: background-color var(--transition), color var(--transition);
}
.nav__mobile a:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.nav__mobile-cta {
  margin-top: 0.5rem;
  text-align: center;
  font-weight: 600;
  background-color: var(--color-primary) !important;
  color: var(--color-primary-fg) !important;
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(10,12,20,0.7) 0%, rgba(10,12,20,0.4) 40%, rgba(10,12,20,0.95) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 52rem;
  padding: 8rem 1.5rem 4rem;
  text-align: center;
  margin: 0 auto;
}

.hero__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.hero__title {
  margin-top: 1.5rem;
  text-transform: uppercase;
  font-size: clamp(1.5rem, 3.5vw, 2.75rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.hero__subtitle {
  margin-top: 1rem;
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: var(--color-fg-muted);
  font-weight: 400;
}

.hero__title span {
  background: linear-gradient(90deg, #e6ecf7 0%, #9fc5ff 55%, #00d4ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__meta {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
}

.hero__meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero__meta-item svg {
  width: 1rem;
  height: 1rem;
  stroke: var(--color-primary);
  fill: none;
  stroke-width: 2;
}

.hero__buttons {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.hero__stats {
  margin-top: 4rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  border-top: 1px solid rgba(30, 34, 54, 0.5);
  padding-top: 2rem;
}

.hero__stat-number {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
}

.hero__stat-label {
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-fg-muted);
}

/* ---------- ABOUT ---------- */
.about__body {
  max-width: 48rem;
  margin: 1.5rem auto 0;
}

.about__body p {
  color: var(--color-fg-muted);
  line-height: 1.7;
  margin-top: 1rem;
}

/* ---------- GOALS ---------- */
.goals__grid {
  margin-top: 3rem;
  display: grid;
  gap: 1.5rem;
}

.goals__card-title { margin-top: 1rem; }

.goals__card-desc {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  line-height: 1.6;
}

.goals__exhibition {
  margin-top: 3rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 212, 255, 0.2);
  background: rgba(0, 212, 255, 0.04);
  text-align: center;
  color: var(--color-fg-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ---------- SPEAKERS ---------- */
.speakers__carousel {
  position: relative;
  margin-top: 3rem;
  overflow: hidden;
}

.speakers__track {
  display: flex;
  gap: 1.5rem;
  padding: 0 2.5rem;
  transition: transform 450ms ease;
  will-change: transform;
}

.speakers__card {
  text-align: center;
  flex: 0 0 var(--speaker-card-width, 100%);
}

.speakers__avatar {
  width: 10rem;
  height: 10rem;
  margin: 0 auto;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background-color: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition);
}

.speakers__card:hover .speakers__avatar {
  border-color: rgba(0, 212, 255, 0.5);
}

.speakers__avatar svg {
  width: 4rem;
  height: 4rem;
  stroke: var(--color-fg-muted);
  opacity: 0.4;
  fill: none;
  stroke-width: 1.5;
}

.speakers__name {
  margin-top: 1.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.speakers__role {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--color-primary);
}

.speakers__topic {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  line-height: 1.5;
}

.speakers__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), color var(--transition);
  z-index: 2;
}
.speakers__arrow:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.speakers__arrow svg {
  width: 1.25rem;
  height: 1.25rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}
.speakers__arrow--prev { left: -0.25rem; }
.speakers__arrow--next { right: -0.25rem; }

.speakers__dots {
  margin-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.speakers__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 9999px;
  background-color: var(--color-border);
  transition: all var(--transition);
}
.speakers__dot.is-active {
  width: 1.5rem;
  background-color: var(--color-primary);
}

/* ---------- SCHEDULE ---------- */
.schedule__tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.schedule__tab {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--color-bg-secondary);
  color: var(--color-fg-muted);
  transition: background-color var(--transition), color var(--transition);
}
.schedule__tab:hover { color: var(--color-fg); }
.schedule__tab.is-active {
  background-color: var(--color-primary);
  color: var(--color-primary-fg);
}

.schedule__panel {
  display: none;
  margin-top: 2.5rem;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}
.schedule__panel.is-active { display: block; }

.schedule__event {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  margin-bottom: 0.75rem;
  transition: border-color var(--transition);
}
.schedule__event:hover { border-color: rgba(0, 212, 255, 0.3); }

.schedule__event-time {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  padding-top: 0.125rem;
}

.schedule__event-body { flex: 1; min-width: 0; }

.schedule__event-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.5rem;
}

.schedule__event-title { font-weight: 600; }

.schedule__event-speaker {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: rgba(0, 212, 255, 0.8);
}

.schedule__event-meta {
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 0.75rem;
  color: var(--color-fg-muted);
}

.schedule__event-meta svg {
  width: 0.75rem;
  height: 0.75rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.schedule__note {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-fg-muted);
  font-style: italic;
}

/* ---------- PARTNERS ---------- */
.partners__group { margin-top: 3rem; }
.partners__group + .partners__group { margin-top: 2rem; }

.partners__group-title {
  text-align: center;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.partners__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}

.partners__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: rgba(10, 12, 20, 0.5);
  transition: border-color var(--transition);
  text-align: center;
}
.partners__item:hover { border-color: rgba(0, 212, 255, 0.4); }

.partners__logo {
  width: 100%;
  max-width: 7.5rem;
  height: 4.5rem;
  object-fit: contain;
}

.partners__item-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-fg-muted);
}

/* ---------- GALLERY ---------- */
.gallery__accordion { margin-top: 3rem; }

.gallery__year {
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  overflow: hidden;
  margin-bottom: 1rem;
}

.gallery__year-btn {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-bg);
  padding: 1rem 1.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  text-align: left;
  transition: background-color var(--transition);
}
.gallery__year-btn:hover { background-color: rgba(22, 24, 38, 0.5); }

.gallery__year-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  stroke: var(--color-fg-muted);
  fill: none;
  stroke-width: 2;
  transition: transform 0.3s;
}
.gallery__year-btn.is-open svg { transform: rotate(180deg); }

.gallery__images {
  display: none;
  padding: 1.5rem;
  padding-top: 0.5rem;
  background-color: rgba(10, 12, 20, 0.5);
}
.gallery__images.is-open { display: grid; gap: 0.75rem; grid-template-columns: repeat(1, 1fr); }

.gallery__thumb {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  border-radius: var(--radius);
  cursor: pointer;
}

.gallery__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.gallery__thumb:hover img {
  transform: scale(1.05);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background-color: rgba(10, 12, 20, 0.96);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
}
.lightbox.is-open { display: flex; }

.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  padding: 0.5rem;
  color: var(--color-fg);
  transition: color var(--transition);
}
.lightbox__close:hover { color: var(--color-primary); }
.lightbox__close svg { width: 1.5rem; height: 1.5rem; }

.lightbox__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.5rem;
  color: var(--color-fg);
  transition: color var(--transition);
}
.lightbox__arrow:hover { color: var(--color-primary); }
.lightbox__arrow svg { width: 2rem; height: 2rem; }
.lightbox__arrow--prev { left: 1rem; }
.lightbox__arrow--next { right: 1rem; }

.lightbox__img {
  max-width: min(90vw, 64rem);
  max-height: 80vh;
  border-radius: var(--radius);
  object-fit: contain;
}

.lightbox__counter {
  position: absolute;
  bottom: 2rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
}

/* ---------- CONDITIONS ---------- */
.conditions__body {
  margin-top: 3rem;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.conditions__list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.conditions__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
}
.conditions__row:last-child { border-bottom: none; padding-bottom: 0; }

.conditions__row-label { color: var(--color-fg-muted); }

.conditions__row-price {
  font-family: var(--font-mono);
  font-weight: 600;
  white-space: nowrap;
}

.conditions__row-note {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-fg-muted);
  margin-left: 0.25rem;
}

.conditions__includes {
  margin-top: 0.75rem;
}

.conditions__includes li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  margin-bottom: 0.5rem;
}

.conditions__dot {
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  flex-shrink: 0;
}

.conditions__disclaimer {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: rgba(10, 12, 20, 0.5);
  font-size: 0.75rem;
  color: var(--color-fg-muted);
  line-height: 1.6;
}

.conditions__disclaimer svg {
  width: 1rem;
  height: 1rem;
  stroke: var(--color-fg-muted);
  fill: none;
  stroke-width: 2;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

/* ---------- REGISTRATION ---------- */
.reg__selector {
  margin-top: 2.5rem;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

.reg__selector-btn {
  flex: 1;
  padding: 0.625rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--color-bg-secondary);
  color: var(--color-fg-muted);
  transition: background-color var(--transition), color var(--transition);
}
.reg__selector-btn.is-active {
  background-color: var(--color-primary);
  color: var(--color-primary-fg);
}

.reg__form {
  margin-top: 2rem;
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group { display: flex; flex-direction: column; }

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
}

.form-label .required {
  color: var(--color-primary);
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.625rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  transition: border-color var(--transition);
  outline: none;
}
.form-input::placeholder { color: var(--color-fg-muted); }
.form-input:focus,
.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.form-input--error {
  border-color: var(--color-destructive) !important;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-fg-muted);
  margin-top: 0.25rem;
}

.form-error {
  font-size: 0.75rem;
  color: var(--color-destructive);
  margin-top: 0.25rem;
}

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.form-check input[type="checkbox"] {
  margin-top: 0.25rem;
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.form-check label {
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  line-height: 1.5;
}

.form-check label a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.form-check label a:hover { text-decoration: none; }

.payment-toggle {
  display: flex;
  gap: 0.5rem;
}

.payment-toggle__btn {
  flex: 1;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
  color: var(--color-fg-muted);
  transition: all var(--transition);
}
.payment-toggle__btn.is-active {
  background-color: rgba(0, 212, 255, 0.1);
  color: var(--color-primary);
  border-color: rgba(0, 212, 255, 0.3);
}

.captcha-box {
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: rgba(10, 12, 20, 0.5);
}


.captcha-box__smart {
  margin: 0.5rem 0 0.75rem;
}

.captcha-box__hint {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-fg-muted);
}
.captcha-box__image {
  margin: 0.5rem 0;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.captcha-box__refresh {
  font-size: 0.75rem;
  color: var(--color-primary);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.partner-tooltip {
  position: relative;
  display: inline-flex;
}

.partner-tooltip__popup {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  font-size: 0.75rem;
  color: var(--color-fg);
  white-space: nowrap;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
  z-index: 10;
}
.partner-tooltip:hover .partner-tooltip__popup,
.partner-tooltip:focus-within .partner-tooltip__popup {
  display: block;
}

.reg__success {
  text-align: center;
  padding: 4rem 1.5rem;
}

.reg__success svg {
  width: 4rem;
  height: 4rem;
  stroke: var(--color-primary);
  fill: none;
  stroke-width: 2;
  margin: 0 auto;
}

.reg__errors {
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-destructive);
  background-color: rgba(239, 68, 68, 0.08);
  margin-bottom: 1rem;
}

.reg__errors li {
  font-size: 0.875rem;
  color: var(--color-destructive);
  margin-bottom: 0.25rem;
}

/* ---------- VENUE ---------- */
.venue__grid {
  margin-top: 3rem;
  display: grid;
  gap: 2rem;
}

.venue__map {
  aspect-ratio: 16/9;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

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

.venue__info {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.venue__info-item {
  display: flex;
  gap: 1rem;
}

.venue__info-title {
  font-weight: 500;
}

.venue__info-text {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  line-height: 1.6;
}

/* ---------- FOOTER ---------- */
.footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  padding: 4rem 0;
}

.footer__grid {
  display: grid;
  gap: 2.5rem;
}

.footer__brand-desc {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  line-height: 1.6;
}

.footer__heading {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.footer__links li { margin-bottom: 0.5rem; }

.footer__links a {
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--color-primary); }

.footer__contact-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(107, 120, 148, 0.7);
  margin-bottom: 0.125rem;
}

.footer__contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
  transition: color var(--transition);
  margin-bottom: 0.75rem;
}
.footer__contact-link:hover { color: var(--color-primary); }
.footer__contact-link svg {
  width: 0.875rem;
  height: 0.875rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.footer__bottom {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-fg-muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* sm: 640px+ */
@media (min-width: 640px) {
  .hero__meta { flex-direction: row; gap: 2rem; }
  .hero__buttons { flex-direction: row; }
  .gallery__images.is-open { grid-template-columns: repeat(2, 1fr); }
  .partners__grid { grid-template-columns: repeat(3, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, 1fr); }
}

/* md: 768px+ */
@media (min-width: 768px) {
  .gallery__images.is-open { grid-template-columns: repeat(3, 1fr); }
  .goals__grid { grid-template-columns: repeat(2, 1fr); }
}

/* lg: 1024px+ */
@media (min-width: 1024px) {
  .nav__links { display: flex; }
  .nav__cta { display: inline-block; }
  .nav__toggle { display: none; }

  .goals__grid { grid-template-columns: repeat(4, 1fr); }

  .speakers__arrow--prev { left: -1.25rem; }
  .speakers__arrow--next { right: -1.25rem; }

  .partners__grid { grid-template-columns: repeat(4, 1fr); }

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

  .footer__grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 639px) {
  .nav__logo-image { width: 2.25rem; height: 2.25rem; }
  .partners__logo { max-width: 6rem; height: 3.5rem; }
}