/* ============================================
   AWS CDK Conference Japan 2026
   Style Sheet
   ============================================ */

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

:root {
  --color-primary: #ff9900;
  --color-primary-dark: #e68a00;
  --color-primary-light: #ffad33;
  --color-bg-dark: #232f3e;
  --color-bg-darker: #1a1a2e;
  --color-bg-card: #2a3a4e;
  --color-bg-card-hover: #334a5e;
  --color-text-white: #ffffff;
  --color-text-light: #c9d6df;
  --color-text-muted: #8899aa;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-success: #36d399;
  --color-info: #3abff8;
  --color-warning: #fbbd23;
  --font-family: "Noto Sans JP", sans-serif;
  --header-height: 64px;
  --container-width: 1200px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-darker);
  color: var(--color-text-white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
}

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

ul {
  list-style: none;
}

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

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  background-color: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand a {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-brand a:hover {
  color: var(--color-primary-light);
}

.nav-menu {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-menu a {
  color: var(--color-text-light);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  position: relative;
  padding: 4px 0;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-menu a:hover {
  color: var(--color-text-white);
}

.nav-menu a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-white);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle.active .nav-toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 50%, #16213e 100%);
}

.hero-particles {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255, 153, 0, 0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 60%, rgba(255, 153, 0, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 50% 30%, rgba(255, 153, 0, 0.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 80%, rgba(255, 153, 0, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 40%, rgba(255, 153, 0, 0.2) 0%, transparent 100%),
    radial-gradient(2px 2px at 20% 80%, rgba(58, 191, 248, 0.2) 0%, transparent 100%),
    radial-gradient(2px 2px at 80% 10%, rgba(58, 191, 248, 0.15) 0%, transparent 100%);
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -30%;
  width: 80%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(255, 153, 0, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 120px 24px 120px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  border: 1px solid var(--color-primary);
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: 32px;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 32px;
}

.hero-title span {
  display: block;
}

.hero-title-aws {
  color: var(--color-primary);
}

.hero-title-conf {
  color: var(--color-text-white);
  letter-spacing: -0.02em;
}

.hero-title-jp {
  color: var(--color-text-light);
  font-size: 0.7em;
}

.hero-title-year {
  color: var(--color-primary);
}

.hero-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-bottom: 40px;
}

.hero-info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

.hero-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-hashtag {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-text-muted), transparent);
  animation: scrollLine 2s ease infinite;
}

@keyframes scrollLine {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 700;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg-darker);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  color: var(--color-bg-darker);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 153, 0, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-white);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-icon {
  width: 16px;
  height: 16px;
}

/* --- Section Common --- */
.section {
  padding: 96px 0;
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  text-align: center;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 48px;
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 20px;
  margin-bottom: 48px;
}

.about-card {
  background: var(--color-bg-card);
  border-radius: 12px;
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.about-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 153, 0, 0.3);
}

.about-card-main {
  grid-row: span 2;
}

.about-card-main h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.about-card-main p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  margin-bottom: 12px;
}

.about-card-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.about-card-icon svg {
  width: 100%;
  height: 100%;
}

.about-card:not(.about-card-main) {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.about-card:not(.about-card-main) h3 {
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
}

.about-card:not(.about-card-main) p {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

/* Info Table */
.about-details {
  max-width: 700px;
  margin: 0 auto;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
}

.info-table th,
.info-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.info-table th {
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-primary);
  white-space: nowrap;
  width: 120px;
}

.info-table td {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

/* --- Timetable Section --- */
.timetable-heading {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  padding-left: 16px;
  border-left: 3px solid var(--color-primary);
}

.timetable-overview {
  margin-bottom: 48px;
}

.schedule-timeline {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.schedule-item {
  display: flex;
  align-items: center;
  gap: 20px;
}

.schedule-time {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-muted);
  width: 130px;
  text-align: right;
  flex-shrink: 0;
}

.schedule-content {
  flex: 1;
  padding: 16px 24px;
  border-radius: 8px;
  border-left: 3px solid;
}

.schedule-tag-opening {
  background: rgba(255, 153, 0, 0.1);
  border-color: var(--color-primary);
}

.schedule-tag-session {
  background: rgba(58, 191, 248, 0.1);
  border-color: var(--color-info);
}

.schedule-tag-break {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--color-text-muted);
}

.schedule-tag-closing {
  background: rgba(255, 153, 0, 0.1);
  border-color: var(--color-primary);
}

.schedule-tag-party {
  background: rgba(54, 211, 153, 0.1);
  border-color: var(--color-success);
}

.schedule-label {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Session Categories */
.timetable-categories {
  margin-bottom: 48px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.category-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: var(--color-bg-card);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-light);
  transition: border-color var(--transition-base);
}

.category-card:hover {
  border-color: rgba(255, 153, 0, 0.3);
}

.category-icon {
  font-size: 1.25rem;
}

/* Track Info */
.track-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.track-card {
  background: var(--color-bg-card);
  border-radius: 12px;
  padding: 32px;
  border: 1px solid var(--color-border);
}

.track-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.track-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(255, 153, 0, 0.15);
  color: var(--color-primary);
  margin-bottom: 12px;
}

.track-badge-sub {
  background: rgba(58, 191, 248, 0.15);
  color: var(--color-info);
}

.track-card p:last-child {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

/* --- Workshops Section --- */
.workshop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.workshop-card {
  background: var(--color-bg-card);
  border-radius: 12px;
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.workshop-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 153, 0, 0.3);
}

.workshop-level {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.workshop-level-beginner {
  background: rgba(54, 211, 153, 0.15);
  color: var(--color-success);
}

.workshop-level-intermediate {
  background: rgba(58, 191, 248, 0.15);
  color: var(--color-info);
}

.workshop-level-advanced {
  background: rgba(251, 189, 35, 0.15);
  color: var(--color-warning);
}

.workshop-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.workshop-time {
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.workshop-card p:last-child {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* --- Sponsors Section --- */
.sponsors-note {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: -32px;
  margin-bottom: 48px;
}

.sponsor-tiers {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-bottom: 48px;
}

.sponsor-tier {
  text-align: center;
}

.sponsor-tier-name {
  font-size: 1.25rem;
  font-weight: 900;
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.sponsor-platinum {
  color: #e5e4e2;
}

.sponsor-gold {
  color: var(--color-primary);
}

.sponsor-silver {
  color: #a0a0a0;
}

.sponsor-tier-desc {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  margin-bottom: 20px;
}

.sponsor-slots {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.sponsor-placeholder {
  width: 240px;
  height: 100px;
  background: var(--color-bg-card);
  border: 2px dashed var(--color-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  transition: border-color var(--transition-base);
}

.sponsor-placeholder:hover {
  border-color: rgba(255, 153, 0, 0.3);
}

.sponsor-placeholder-sm {
  width: 180px;
  height: 80px;
  font-size: 0.8125rem;
}

.sponsor-past {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.sponsor-past h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.sponsor-past-list {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.sponsor-past-name {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  font-weight: 500;
}

/* --- Access Section --- */
.access-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.access-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.access-address {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 20px;
}

.access-list {
  margin-bottom: 24px;
}

.access-list li {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.access-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
}

.access-notes h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.notes-list li {
  color: var(--color-text-light);
  font-size: 0.875rem;
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

.notes-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 6px;
  background: var(--color-warning);
  border-radius: 50%;
}

.access-capacity {
  margin-top: 24px;
}

.access-capacity h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.capacity-items {
  display: flex;
  gap: 24px;
}

.capacity-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.capacity-number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}

.capacity-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* --- Footer --- */
.footer {
  background: #111827;
  padding: 64px 0 32px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.footer-desc {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-links h4,
.footer-social h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.footer-links li,
.footer-social li {
  margin-bottom: 10px;
}

.footer-links a,
.footer-social a {
  color: var(--color-text-light);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-links a:hover,
.footer-social a:hover {
  color: var(--color-primary);
}

.social-icon {
  width: 18px;
  height: 18px;
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-card-main {
    grid-column: span 2;
    grid-row: auto;
  }

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

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    justify-content: center;
    gap: 24px;
    padding: 40px;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu a {
    font-size: 1.25rem;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }

  .hero-info {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

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

  .about-card-main {
    grid-column: auto;
  }

  .schedule-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .schedule-time {
    text-align: left;
    width: auto;
  }

  .schedule-content {
    width: 100%;
  }

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

  .track-info {
    grid-template-columns: 1fr;
  }

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section {
    padding: 64px 0;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .sponsor-placeholder {
    width: 100%;
  }

  .sponsor-placeholder-sm {
    width: 100%;
  }

  .capacity-items {
    gap: 40px;
  }
}