/* ============================================
   CSS Variables (Dark Theme)
   ============================================ */
:root {
  --primary: #6366F1;
  --primary-dark: #4F46E5;
  --primary-light: rgba(99,102,241,0.15);
  --accent-gradient: linear-gradient(135deg, #6366F1, #EC4899);
  --bg: #050510;
  --bg-alt: #0A0A1A;
  --bg-card: rgba(255,255,255,0.04);
  --text: #FFFFFF;
  --text-muted: #9CA3AF;
  --border: rgba(255,255,255,0.08);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  --radius: 12px;
  --radius-lg: 20px;
  --text-hero: clamp(40px, 6vw, 72px);
  --text-h2: clamp(28px, 3.5vw, 42px);
  --text-h3: clamp(18px, 2.5vw, 22px);
  --text-body: 16px;
  --text-small: 14px;
  --text-caption: 12px;
  --space-section: clamp(80px, 10vw, 120px);
  --space-group: clamp(40px, 5vw, 64px);
  --space-element: clamp(16px, 2vw, 24px);
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Space Grotesk', 'Noto Sans JP', sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  animation: fadeIn 0.5s ease-out;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; }

/* ============================================
   Common Components
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 80px);
}

.section { padding: var(--space-section) 0; }

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }
.animate-on-scroll.visible .stagger-item:nth-child(1) { transition-delay: 0s; }
.animate-on-scroll.visible .stagger-item:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll.visible .stagger-item:nth-child(3) { transition-delay: 0.15s; }
.animate-on-scroll.visible .stagger-item:nth-child(4) { transition-delay: 0.2s; }
.animate-on-scroll.visible .stagger-item:nth-child(5) { transition-delay: 0.25s; }
.animate-on-scroll.visible .stagger-item:nth-child(6) { transition-delay: 0.3s; }

.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.animate-on-scroll.visible .stagger-item { opacity: 1; transform: translateY(0); }

/* Gradient Text */
.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(99,102,241,0.3);
  position: relative;
  z-index: 1;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99,102,241,0.5);
}
.btn-primary.btn-hero {
  padding: 20px 56px;
  font-size: 18px;
}

/* Section Headers */
.section-header { text-align: center; margin-bottom: var(--space-group); }
.section-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.section-title {
  font-size: var(--text-h2);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text);
}
.section-subtitle {
  font-size: var(--text-body);
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

/* ============================================
   Header
   ============================================ */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: background-color 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
}
header.scrolled {
  background: rgba(5,5,16,0.9);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.5);
  padding: 12px 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}
.logo span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}
.desktop-nav { display: flex; align-items: center; gap: 32px; }
.desktop-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}
.desktop-nav a:hover { color: #fff; }
.header-cta {
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 100px;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: all 0.3s;
  border-radius: 1px;
}

/* Mobile Menu */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  z-index: 1001;
}
.overlay.open { opacity: 1; pointer-events: auto; }
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 360px;
  height: 100vh;
  background: #0A0A1A;
  transition: right 0.3s ease;
  z-index: 1002;
  padding: 80px 32px 32px;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.mobile-menu.open { right: 0; }
.mobile-menu a {
  display: block;
  padding: 16px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

/* ============================================
   Hero / FV
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(99,102,241,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(236,72,153,0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(99,102,241,0.08) 0%, transparent 50%);
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.hero-date-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 100px;
  margin-bottom: 32px;
  letter-spacing: 0.05em;
}
.hero-title {
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 24px);
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 32px;
}
.hero-meta {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--text-muted);
}
.hero-meta-item svg { opacity: 0.7; }

/* Countdown */
.countdown {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}
.countdown-item { text-align: center; }
.countdown-value {
  display: block;
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.countdown-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-top: 6px;
}
.countdown-sep {
  font-size: 32px;
  font-weight: 300;
  color: rgba(255,255,255,0.2);
  padding-bottom: 20px;
}
.hero-note {
  font-size: var(--text-small);
  color: var(--text-muted);
  margin-top: 20px;
}

/* ============================================
   Speakers Section
   ============================================ */
.speakers { background: var(--bg-alt); }
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.speaker-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s ease;
}
.speaker-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-4px);
}
.speaker-img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 20px;
  border: 3px solid rgba(255,255,255,0.1);
  transition: border-color 0.3s;
}
.speaker-card:hover .speaker-img {
  border-color: var(--primary);
}
.speaker-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.speaker-role {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.speaker-title {
  font-size: var(--text-small);
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
}
.speaker-topic {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ============================================
   Timetable Section
   ============================================ */
.timetable { background: var(--bg); }

/* Tabs */
.timetable-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: var(--space-group);
}
.tab-btn {
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: all 0.3s ease;
  font-family: inherit;
}
.tab-btn:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.2);
}
.tab-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(99,102,241,0.3);
}

/* Timetable Content */
.timetable-day { display: none; }
.timetable-day.active { display: block; }
.tt-item {
  display: flex;
  gap: 24px;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 8px;
  transition: all 0.3s ease;
  background: var(--bg-card);
}
.tt-item:hover {
  border-color: rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.06);
}
.tt-item.keynote {
  border-color: rgba(99,102,241,0.3);
  background: rgba(99,102,241,0.05);
}
.tt-item.break {
  border-color: transparent;
  background: transparent;
  opacity: 0.5;
}
.tt-time {
  min-width: 130px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  padding-top: 2px;
  flex-shrink: 0;
}
.tt-detail { flex: 1; }
.tt-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 8px;
}
.tt-tag.registration { background: rgba(255,255,255,0.08); color: var(--text-muted); }
.tt-tag.keynote-tag { background: var(--accent-gradient); color: #fff; }
.tt-tag.session-tag { background: rgba(99,102,241,0.15); color: #818CF8; }
.tt-tag.workshop-tag { background: rgba(16,185,129,0.15); color: #34D399; }
.tt-tag.break-tag { background: rgba(255,255,255,0.05); color: var(--text-muted); }
.tt-tag.networking-tag { background: rgba(236,72,153,0.15); color: #F472B6; }
.tt-detail h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.4;
}
.tt-speaker {
  font-size: var(--text-small);
  color: var(--text-muted);
}

/* ============================================
   Categories Section
   ============================================ */
.categories { background: var(--bg-alt); }
.categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all 0.3s ease;
}
.category-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-4px);
}
.category-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}
.category-card h3 {
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: 10px;
}
.category-card p {
  font-size: var(--text-small);
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}
.category-count {
  font-size: 13px;
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Sponsors Section
   ============================================ */
.sponsors { background: var(--bg); }
.sponsors-content {
  max-width: 900px;
  margin: 0 auto;
}
.sponsor-tier { margin-bottom: var(--space-group); }
.sponsor-tier:last-child { margin-bottom: 0; }
.tier-label {
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.sponsor-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.sponsor-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.3s ease;
  letter-spacing: 0.02em;
}
.sponsor-logo:hover {
  border-color: rgba(255,255,255,0.2);
  color: #fff;
}
.sponsor-logos.platinum .sponsor-logo {
  padding: 28px 48px;
  font-size: 18px;
  min-width: 200px;
}
.sponsor-logos.gold .sponsor-logo {
  padding: 20px 36px;
  font-size: 15px;
  min-width: 160px;
}
.sponsor-logos.silver .sponsor-logo {
  padding: 14px 28px;
  font-size: 13px;
  min-width: 120px;
}

/* ============================================
   Past Event Section
   ============================================ */
.past-event { background: var(--bg-alt); }
.past-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: var(--space-group);
}
.past-stat {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 20px;
}
.past-stat-value {
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 8px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.past-stat-label {
  font-size: var(--text-small);
  color: var(--text-muted);
  font-weight: 500;
}
.past-quotes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.past-quote {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.past-quote p {
  font-size: var(--text-small);
  color: rgba(255,255,255,0.8);
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: italic;
}
.past-quote span {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================
   Registration Form
   ============================================ */
.register-section {
  background: var(--bg);
  position: relative;
}
.register-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent-gradient);
}
.register-form-wrap {
  max-width: 640px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.required {
  color: #F472B6;
  margin-left: 4px;
}
.form-input,
.form-select {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  border: 1.5px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  background: rgba(255,255,255,0.05);
  color: #fff;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
}
.form-input:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-input::placeholder { color: #6B7280; }
.form-select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}
.form-select option { color: var(--text); background: #1a1a2e; }

/* Checkbox Group */
.checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--text-small);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
}
.checkbox-label:hover { color: #fff; }
.checkbox-label input[type="checkbox"] { display: none; }
.checkbox-custom {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border: 1.5px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
  background: var(--primary);
  border-color: var(--primary);
}
.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-top: -2px;
}

.form-submit {
  margin-top: 8px;
  text-align: center;
}
.form-submit .btn-primary {
  width: 100%;
  padding: 18px 40px;
  font-size: 16px;
}
.form-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
  text-align: center;
  line-height: 1.8;
}

/* ============================================
   Footer
   ============================================ */
footer {
  padding: 48px 0 32px;
  background: var(--bg-alt);
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  max-width: 280px;
  color: var(--text-muted);
}
.footer-col h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: color 0.2s;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}
.footer-links { display: flex; gap: 24px; }
.footer-links a {
  font-size: 12px;
  color: var(--text-muted);
  transition: color 0.2s;
}
.footer-links a:hover { color: #fff; }

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  box-shadow: 0 4px 16px rgba(99,102,241,0.3);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.show { opacity: 1; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(99,102,241,0.5); }

/* ============================================
   Responsive - Tablet
   ============================================ */
@media (max-width: 1024px) {
  .speakers-grid { grid-template-columns: repeat(2, 1fr); }
  .past-stats { grid-template-columns: repeat(2, 1fr); }
  .past-quotes { grid-template-columns: 1fr; }
  .categories-grid { grid-template-columns: 1fr; }
}

/* ============================================
   Responsive - Mobile
   ============================================ */
@media (max-width: 768px) {
  .desktop-nav { display: none; }
  .hamburger { display: flex; }
  .hero { padding-top: 60px; min-height: auto; padding-bottom: 60px; }
  .hero-title { font-size: clamp(32px, 8vw, 48px); }
  .hero-meta { flex-direction: column; gap: 12px; align-items: center; }
  .countdown { gap: 10px; }
  .countdown-value { font-size: clamp(28px, 7vw, 40px); }
  .countdown-sep { font-size: 24px; }
  .btn-primary.btn-hero { padding: 16px 36px; font-size: 16px; }
  .speakers-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .timetable-tabs { flex-direction: column; align-items: center; }
  .tab-btn { width: 100%; max-width: 300px; }
  .tt-item { flex-direction: column; gap: 8px; }
  .tt-time { min-width: auto; }
  .past-stats { grid-template-columns: repeat(2, 1fr); }
  .register-form-wrap { padding: 28px 20px; }
  .form-row { grid-template-columns: 1fr; }
  .checkbox-group { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .sponsor-logos.platinum .sponsor-logo,
  .sponsor-logos.gold .sponsor-logo {
    min-width: auto;
    flex: 1 1 140px;
  }
  .sponsor-logos.silver .sponsor-logo { min-width: auto; }
}