/* ==========================================================================
   DSG-Branded Cyberpunk Layout Engine - style.css
   ========================================================================== */

/* Font Declarations & Variables */
:root {
  --font-header: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, "Liberation Mono", monospace;

  /* Theme Palette (Inspired by DSG.id) */
  --bg-primary: #02020e;
  --bg-secondary: #060616;
  --bg-black: #000000;
  --grid-line-color: rgba(255, 255, 255, 0.08);
  --grid-line-active: rgba(6, 182, 212, 0.25);

  --text-primary: #ffffff;
  --text-secondary: #a3b3c9;
  --text-muted: #64748b;

  --accent-cyan: #06b6d4;
  --accent-cyan-hover: #22d3ee;
  --accent-emerald: #10b981;
  --accent-glow: rgba(6, 182, 212, 0.15);

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);

  --site-max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-black);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

body {
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(circle at 50% 0%, rgba(13, 10, 50, 0.6) 0%, transparent 60%),
    radial-gradient(circle at 10% 40%, rgba(6, 182, 212, 0.05) 0%, transparent 40%);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Selection Style */
::selection {
  background-color: var(--accent-cyan);
  color: var(--bg-black);
}

/* Scrollbar Style */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-black);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid var(--bg-black);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan);
}

/* Typography Rules */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-header);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 1rem;
}

/* Technical Monospace Tag styling */
.tag-mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--accent-cyan);
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 0.5rem;
}

/* Base Grid Layout Engine */
.section-container {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding: 80px 24px;
  position: relative;
  z-index: 2;
}

/* Dynamic Continuous Grid Lines Overlay */
.cyber-grid-overlay {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--site-max-width);
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.grid-line {
  position: absolute;
  background-color: var(--grid-line-color);
}

.grid-line-v {
  top: 0;
  bottom: 0;
  width: 1px;
}

.grid-line-v-1 {
  left: 25%;
}

.grid-line-v-2 {
  left: 50%;
}

.grid-line-v-3 {
  left: 75%;
}

/* Brutalist Technical Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 0;
  /* Zero rounded corners mandatory! */
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid var(--grid-line-color);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
}

.btn-primary {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.08);
  color: var(--accent-cyan);
}

.btn-primary:hover {
  background: var(--accent-cyan);
  color: var(--bg-black);
  box-shadow: 0 0 15px var(--accent-glow);
}

.btn-secondary {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--text-primary);
  background: transparent;
}

.btn-secondary:hover {
  border-color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-secondary-white {
  border-color: var(--text-primary);
  background: var(--text-primary);
  color: var(--bg-black);
}

.btn-secondary-white:hover {
  background: transparent;
  color: var(--text-primary);
}

.btn-large {
  padding: 16px 36px;
  font-size: 0.9rem;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.75rem;
}

.btn-full-width {
  width: 100%;
  display: flex;
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: transparent;
  border-color: var(--grid-line-color);
  color: var(--text-muted);
}

/* Header & Navigation Bar Styling */
.header {
  width: 100%;
  border-bottom: 1px solid var(--grid-line-color);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  background: rgba(2, 2, 14, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition-fast);
}

.header-container {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.logo {
  font-family: var(--font-header);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.04em;
  justify-content: center;
  align-items: center;
  display: flex;
}

/* Header Logo Heights */
.logo-img-dsg {
  height: 30px;
  transition: height var(--transition-fast);
}

.logo-img-bitdefender {
  height: 20px;
  transition: height var(--transition-fast);
}

.logo-img-ruijie {
  height: 24px;
  margin-top: 12px;
  transition: height var(--transition-fast);
}

.logo-separator {
  font-size: 1.2rem;
  margin: 0 10px;
  transition: all var(--transition-fast);
}

.logo-partners {
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.logo-cross {
  font-size: 0.8rem;
  margin: 0 6px;
  transition: all var(--transition-fast);
}

.logo-accent {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.nav-menu {
  height: 100%;
}

.nav-list {
  display: flex;
  list-style: none;
  height: 100%;
}

.nav-item {
  height: 100%;
  display: flex;
  align-items: center;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  border-left: 1px solid var(--grid-line-color);
  transition: all var(--transition-fast);
}

.nav-item:last-child .nav-link {
  border-right: 1px solid var(--grid-line-color);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

/* Mobile Nav Toggle Button */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.mobile-nav-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

/* Hero Section Styling */
.hero-section {
  position: relative;
  padding-top: 140px;
  /* Offset for header */
  padding-bottom: 80px;
  border-bottom: 1px solid var(--grid-line-color);
  overflow: hidden;
}

.hero-container {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-subtitle {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.05;
  margin-bottom: 2rem;
  text-transform: capitalize;
}

.hero-details-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  width: 100%;
  border-top: 1px solid var(--grid-line-color);
  border-bottom: 1px solid var(--grid-line-color);
  padding: 24px 0;
  margin-bottom: 2.5rem;
}

.detail-block {
  display: flex;
  flex-direction: column;
}

.detail-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.detail-value {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Hero Screen Container */
.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.screen-frame {
  width: 100%;
  max-width: 500px;
  background-color: var(--bg-black);
  border: 1px solid var(--grid-line-color);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  position: relative;
}

.screen-header {
  height: 36px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--grid-line-color);
  display: flex;
  align-items: center;
  padding: 0 12px;
  position: relative;
}

.screen-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 6px;
}

.screen-dot.red {
  background-color: #ef4444;
}

.screen-dot.yellow {
  background-color: #eab308;
}

.screen-dot.green {
  background-color: var(--accent-emerald);
}

.screen-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
}

.screen-content {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-primary);
}

.screen-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
  filter: contrast(1.1) brightness(0.9);
}

.screen-scanlines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%,
      rgba(0, 0, 0, 0.4) 50%), linear-gradient(90deg,
      rgba(255, 0, 0, 0.02),
      rgba(0, 255, 0, 0.01),
      rgba(0, 0, 255, 0.02));
  background-size: 100% 4px, 6px 100%;
  pointer-events: none;
  opacity: 0.4;
}

/* About The Conference Section */
.about-section {
  border-bottom: 1px solid var(--grid-line-color);
  position: relative;
}

.about-header {
  margin-bottom: 3.5rem;
}

.section-title {
  font-size: 2.2rem;
  text-transform: capitalize;
  margin-top: 0.5rem;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 4rem;
}

.about-text-column p {
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.about-visual-column {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Double Overlapping Image Container */
.overlap-images-container {
  position: relative;
  width: 100%;
  max-width: 440px;
  height: 300px;
}

.overlap-img {
  position: absolute;
  border: 1px solid var(--grid-line-color);
  background: var(--bg-black);
  padding: 4px;
}

.overlap-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%,
      rgba(0, 0, 0, 0.4) 50%), linear-gradient(90deg,
      rgba(255, 0, 0, 0.02),
      rgba(0, 255, 0, 0.01),
      rgba(0, 0, 255, 0.02));
  background-size: 100% 4px, 6px 100%;
  pointer-events: none;
  opacity: 0.7;
}

.overlap-img-1 {
  width: 75%;
  height: 200px;
  top: 0;
  right: 0;
  z-index: 2;
}

.overlap-img-2 {
  width: 70%;
  height: 180px;
  bottom: 0;
  left: 0;
  z-index: 1;
  opacity: 0.7;
}

.overlap-img:hover {
  z-index: 3;
  opacity: 1;
  transition: all var(--transition-normal);
  scale: 1.1;
  opacity: 0.9;
  /* border-color: var(--accent-cyan); */
}

/* Stats Counter Section */
.stats-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--grid-line-color);
  background: var(--bg-secondary);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  text-align: center;
  border-right: 1px solid var(--grid-line-color);
}

.stat-item:last-child {
  border-right: none;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--accent-cyan);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

/* Speakers Section Styling */
.speakers-section {
  border-bottom: 1px solid var(--grid-line-color);
}

.section-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--grid-line-color);
  padding-bottom: 24px;
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--grid-line-color);
  border: 1px solid var(--grid-line-color);
}

/* Speaker Frame Elements */
.speaker-card {
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.speaker-img-wrapper {
  width: 100%;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  position: relative;
  background: var(--bg-black);
}

.speaker-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: all var(--transition-normal);
  opacity: 0.75;
}

.speaker-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 40%;
  background: linear-gradient(to top, var(--bg-primary) 10%, transparent 100%);
  pointer-events: none;
}

.speaker-info {
  padding: 24px;
  background: var(--bg-primary);
  position: relative;
  border-top: 1px solid var(--grid-line-color);
}

.speaker-name {
  font-family: var(--font-header);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
}

.speaker-role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.speaker-card:hover {
  background-color: var(--bg-secondary);
}

.speaker-card:hover .speaker-img {
  filter: grayscale(0);
  transform: scale(1.03);
  opacity: 1;
}

/* "Join as a Speaker" Card */
.speaker-card-join {
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 48px 24px;
  background: rgba(6, 182, 212, 0.02);
  border: 1px dashed var(--accent-cyan);
  cursor: pointer;
  height: 100%;
  min-height: 380px;
}

.speaker-join-icon-box {
  width: 60px;
  height: 60px;
  border: 1px solid var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  background: rgba(6, 182, 212, 0.05);
  transition: all var(--transition-fast);
}

.speaker-card-join:hover .speaker-join-icon-box {
  background: var(--accent-cyan);
  color: var(--bg-black);
  box-shadow: 0 0 15px var(--accent-glow);
}

.speaker-join-title {
  font-family: var(--font-header);
  font-size: 1.2rem;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--text-primary);
}

/* Schedule Section Styling */
.schedule-section {
  border-bottom: 1px solid var(--grid-line-color);
}

.schedule-container {
  border: 1px solid var(--grid-line-color);
  background: var(--bg-secondary);
}

/* Tabs */
.schedule-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--grid-line-color);
}

.schedule-tab-btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-right: 1px solid var(--grid-line-color);
  padding: 20px;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
}

.schedule-tab-btn:last-child {
  border-right: none;
}

.schedule-tab-btn.active {
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.05);
  border-bottom: 2px solid var(--accent-cyan);
}

.schedule-tab-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

/* Timeline Row */
.schedule-timeline {
  display: flex;
  flex-direction: column;
}

.schedule-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  border-bottom: 1px solid var(--grid-line-color);
  transition: background-color var(--transition-fast);
}

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

.schedule-time-cell {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  padding: 24px 32px;
  border-right: 1px solid var(--grid-line-color);
  display: flex;
  align-items: center;
}

.schedule-detail-cell {
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.schedule-event-title {
  font-family: var(--font-header);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.schedule-event-speaker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.schedule-row:hover {
  background-color: rgba(255, 255, 255, 0.01);
}

/* Tickets Section Styling */
.tickets-section {
  border-bottom: 1px solid var(--grid-line-color);
}

.tickets-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 3rem;
}

.ticket-card {
  background: var(--bg-secondary);
  border: 1px solid var(--grid-line-color);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

.ticket-card.disabled {
  opacity: 0.5;
}

.ticket-name {
  font-family: var(--font-header);
  font-size: 1.15rem;
  font-weight: 500;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.ticket-validity {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  text-transform: uppercase;
}

.ticket-price-box {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: baseline;
}

.ticket-currency {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--accent-cyan);
  margin-right: 4px;
}

.ticket-price {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1;
}

.ticket-selector-row {
  margin-top: auto;
  margin-bottom: 1.5rem;
}

.ticket-select {
  width: 100%;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--grid-line-color);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border-radius: 0;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 14px;
}

.ticket-card:hover:not(.disabled) {
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 30px rgba(6, 182, 212, 0.05);
}

/* Modal Backdrop Overlay with Blur */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(2, 2, 10, 0.25);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeInModal var(--transition-fast) forwards;
}

@keyframes fadeInModal {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

/* Quick Checkout Modal Box */
.checkout-panel {
  border: 1px solid var(--accent-cyan);
  background: var(--bg-secondary);
  width: 100%;
  max-width: 440px;
  box-shadow: 0 25px 60px rgba(6, 182, 212, 0.2);
  animation: scaleUpModal var(--transition-normal) forwards;
}

@keyframes scaleUpModal {
  from {
    transform: scale(0.95);
    opacity: 0;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

.checkout-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--grid-line-color);
  background: rgba(6, 182, 212, 0.05);
}

.checkout-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

.checkout-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.checkout-close:hover {
  color: var(--text-primary);
}

.checkout-body {
  padding: 24px;
}

.checkout-price-calc {
  display: flex;
  justify-content: space-between;
  margin: 16px 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.checkout-quantity-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.qty-stepper {
  display: flex;
  border: 1px solid var(--grid-line-color);
}

.qty-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background var(--transition-fast);
}

.qty-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

#checkoutQty {
  width: 44px;
  border: none;
  border-left: 1px solid var(--grid-line-color);
  border-right: 1px solid var(--grid-line-color);
  background: transparent;
  color: var(--text-primary);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.divider {
  border: 0;
  border-top: 1px solid var(--grid-line-color);
  margin: 16px 0;
}

.checkout-total-row {
  display: flex;
  justify-content: space-between;
  font-size: 1.05rem;
  margin-bottom: 24px;
}

.checkout-total-row strong {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

/* Still Getting Confused Banner */
.help-section {
  border-bottom: 1px solid var(--grid-line-color);
  background: linear-gradient(135deg, #02020e 0%, #0c0836 100%);
  position: relative;
}

.help-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: center;
}

.help-title {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.help-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.help-action {
  display: flex;
  justify-content: flex-end;
}

/* Sponsors Section Styling */
.sponsors-section {
  border-bottom: 1px solid var(--grid-line-color);
}

.sponsor-category {
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--grid-line-color);
  padding-bottom: 32px;
}

.sponsor-category:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.sponsor-cat-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.sponsor-logos-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}

.sponsor-logo-box {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--grid-line-color);
  padding: 12px;
}

.sponsor-logo-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  opacity: 0.35;
  filter: grayscale(1) brightness(2.5);
  transition: all var(--transition-fast);
}

.sponsor-logo-box:hover img {
  opacity: 0.9;
  filter: grayscale(0) brightness(1);
}

/* Silver category column override */
#silverSponsors {
  grid-template-columns: repeat(5, 1fr);
}

/* Partners grid override */
#partnersSponsors {
  grid-template-columns: repeat(4, 1fr);
}

/* Sponsor CTA Banner */
.sponsor-cta-banner {
  border: 1px solid var(--grid-line-color);
  background: var(--bg-secondary);
  padding: 48px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 5rem;
}

.sponsor-cta-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  max-width: 700px;
}

.sponsor-cta-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin-bottom: 2rem;
}

/* Venue Section styling */
.venue-section {
  border-bottom: 1px solid var(--grid-line-color);
}

/* Venue Details Glassmorphic Card */
#venueInfoBox {
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.venue-card {
  position: relative;
  background: rgba(6, 6, 22, 0.55);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--grid-line-color);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), inset 0 0 15px rgba(255, 255, 255, 0.02);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.venue-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 15px 40px rgba(6, 182, 212, 0.08), inset 0 0 20px rgba(6, 182, 212, 0.02);
}

.venue-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-emerald));
}

.venue-card-body {
  padding: 32px 40px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
}

.venue-main-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.venue-hotel-name {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.venue-meta-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.venue-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.venue-meta-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  width: 80px;
  flex-shrink: 0;
}

.venue-meta-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.venue-meta-value.highlight-cyan {
  color: var(--accent-cyan);
  font-weight: 600;
  font-family: var(--font-header);
}

.venue-address-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid var(--grid-line-color);
  padding-left: 40px;
}

.venue-address-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
}

.venue-map-btn {
  align-self: flex-start;
}

.map-container {
  width: 100%;
  height: 450px;
  position: relative;
  border-top: 1px solid var(--grid-line-color);
  background: var(--bg-black);
}

.map-overlay-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.8);
  pointer-events: none;
}

/* Footer Info Columns Styling */
.footer-info-section {
  border-bottom: 1px solid var(--grid-line-color);
  background: var(--bg-secondary);
}

.footer-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 5rem;
}

.footer-widget {
  display: flex;
  flex-direction: column;
}

.widget-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--grid-line-color);
  padding-bottom: 8px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.gallery-item {
  aspect-ratio: 1;
  border: 1px solid var(--grid-line-color);
  overflow: hidden;
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: all var(--transition-fast);
}

.gallery-item:hover img {
  filter: grayscale(0) scale(1.05);
}

/* Address column */
.address-line {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.address-title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.address-meta {
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.address-meta a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.address-meta a:hover {
  color: var(--accent-cyan);
}

/* Social links circle */
.social-links-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.social-circle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--grid-line-color);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  background: var(--bg-primary);
}

.social-circle:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.05);
}

/* Upcoming events widget at footer */
.related-events-row {
  border-top: 1px solid var(--grid-line-color);
  padding-top: 48px;
}

.related-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.related-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 900px;
}

.related-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-primary);
  border: 1px solid var(--grid-line-color);
  padding: 24px;
  transition: all var(--transition-fast);
}

.related-card-title {
  font-family: var(--font-header);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.related-card-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

.related-card:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-secondary);
}

/* Footer Main Layout */
.footer-main {
  background: #02020e;
  border-top: 1px solid var(--grid-line-color);
}

.footer-main .section-container {
  padding: 60px 24px 30px;
}

.footer-main-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-column {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-offices-container {
  grid-column: span 2;
  display: flex;
  flex-direction: row;
  gap: 40px;
  flex-wrap: wrap;
  min-width: 280px;
}

.footer-logo {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.footer-brand-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.footer-social-bar {
  display: flex;
  gap: 8px;
}

.social-link-item {
  width: 32px;
  height: 32px;
  border: 1px solid var(--grid-line-color);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-link-item:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.footer-links-list {
  list-style: none;
}

.footer-links-list li {
  margin-bottom: 12px;
}

.footer-links-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links-list a:hover {
  color: var(--accent-cyan);
}

/* Twitter Feed Widget Emulator */
.footer-twitter-column {
  display: flex;
  flex-direction: column;
}

.twitter-feed-box {
  background: var(--bg-secondary);
  border: 1px solid var(--grid-line-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.twitter-error-msg {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.btn-twitter {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: transparent;
  font-size: 0.7rem;
}

.btn-twitter:hover {
  background: var(--accent-cyan);
  color: var(--bg-black);
}

/* Copyright Row */
.footer-copyright-bar {
  border-top: 1px solid var(--grid-line-color);
  padding: 24px 24px;
  max-width: var(--site-max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.copyright-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.copyright-links a:hover {
  color: var(--accent-cyan);
}

/* Notification Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent-cyan);
  border-top: 1px solid var(--grid-line-color);
  border-right: 1px solid var(--grid-line-color);
  border-bottom: 1px solid var(--grid-line-color);
  color: var(--text-primary);
  padding: 16px 20px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  animation: slideIn var(--transition-fast) forwards;
}

.toast.success {
  border-left-color: var(--accent-emerald);
}

@keyframes slideIn {
  from {
    transform: translateX(120%);
  }

  to {
    transform: translateX(0);
  }
}

/* ==========================================================================
   Responsive Viewports & Media Queries
   ========================================================================== */

/* Tablet & Widescreen Scaling (max-width: 1024px) */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    align-items: center;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .overlap-images-container {
    max-width: 100%;
    height: 350px;
  }

  .overlap-img-1 {
    width: 65%;
    height: 250px;
  }

  .overlap-img-2 {
    width: 60%;
    height: 220px;
  }

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

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

  .sponsor-logos-grid {
    grid-template-columns: repeat(4, 1fr) !important;
  }

  .footer-info-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-main-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .footer-twitter-column {
    grid-column: span 2;
  }
}

/* Mobile Viewports (max-width: 768px) */
@media (max-width: 768px) {
  .section-container {
    padding: 60px 16px;
  }

  /* Responsive Header Logo Scaling on Tablet/Mobile */
  .logo-img-dsg {
    height: 18px;
  }

  .logo-img-bitdefender {
    height: 10px;
  }

  .logo-img-ruijie {
    height: 13px;
    margin-top: 6px;
  }

  .logo-separator {
    font-size: 1rem;
    margin: 0 6px;
  }

  .logo-partners {
    gap: 4px;
  }

  .logo-cross {
    font-size: 0.7rem;
    margin: 0 4px;
  }

  /* Responsive Venue Card Table/Mobile */
  .venue-card-body {
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 30px;
  }

  .venue-address-info {
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--grid-line-color);
    padding-top: 24px;
  }

  .cyber-grid-overlay {
    display: none;
    /* Simplify mobile graphics for better scrolling performance */
  }

  /* Responsive Mobile Menu styling */
  .mobile-nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-black);
    border-top: 1px solid var(--grid-line-color);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 99;
    overflow-y: auto;
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    height: auto;
    padding: 30px 0;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    padding: 20px 24px;
    border-left: none;
    border-bottom: 1px solid var(--grid-line-color);
    font-size: 1rem;
  }

  .nav-item:last-child .nav-link {
    border-right: none;
  }

  .header-action {
    display: none;
    /* Hide header action button on mobile, use navigation link instead */
  }

  .hero-title {
    font-size: 2.2rem;
  }

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

  .stat-item {
    border-right: 1px solid var(--grid-line-color);
    border-bottom: 1px solid var(--grid-line-color);
  }

  .stat-item:nth-child(2n) {
    border-right: none;
  }

  .stat-item:nth-child(3),
  .stat-item:nth-child(4) {
    border-bottom: none;
  }

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

  .schedule-time-cell {
    border-right: none;
    border-bottom: 1px solid var(--grid-line-color);
    padding: 16px 24px;
  }

  .schedule-detail-cell {
    padding: 20px 24px;
  }

  .help-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 20px;
  }

  .help-action {
    justify-content: center;
  }

  .sponsor-logos-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px;
  }

  .footer-main-grid {
    grid-template-columns: 1fr;
  }

  .footer-offices-container {
    grid-column: span 1;
    min-width: 100%;
    gap: 20px;
  }

  .footer-twitter-column {
    grid-column: span 1;
  }

  .footer-copyright-bar {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* Extremely Small Devices (max-width: 480px) */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  /* Responsive Header Logo Scaling on extremely small mobile */
  .logo-img-dsg {
    height: 20px;
  }

  .logo-img-bitdefender {
    height: 12px;
  }

  .logo-img-ruijie {
    height: 16px;
  }

  .logo-separator {
    font-size: 0.8rem;
    margin: 0 4px;
  }

  .logo-partners {
    gap: 2px;
  }

  .logo-cross {
    font-size: 0.6rem;
    margin: 0 2px;
  }

  /* Responsive Venue Card Extremely Small Mobile */
  .venue-hotel-name {
    font-size: 1.4rem;
  }

  .venue-card-body {
    padding: 24px;
  }

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

  .venue-meta-label {
    width: auto;
  }

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

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

  .stats-panel {
    grid-template-columns: 1fr;
  }

  .stat-item {
    border-right: none !important;
    border-bottom: 1px solid var(--grid-line-color) !important;
  }

  .stat-item:last-child {
    border-bottom: none !important;
  }

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

  .schedule-tab-btn {
    border-right: none;
    border-bottom: 1px solid var(--grid-line-color);
  }

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

  .sponsor-cta-banner {
    padding: 24px;
  }

  .sponsor-cta-title {
    font-size: 1.2rem;
  }

  .related-cards-grid {
    grid-template-columns: 1fr;
  }

  .footer-offices-container {
    grid-column: span 1;
    min-width: 100%;
    gap: 15px;
  }

  .section-action-block {
    display: none !important;
    visibility: none !important;
    height: 0 !important;
    overflow: hidden !important;
  }
}

/* ──────────────────────────────────────────────────────────────────────────
   DSG Theme Toggle Engine (Dark/Light Modes)
   ────────────────────────────────────────────────────────────────────────── */

/* Dynamic Theme Toggle Support (Light Mode Override) */
html[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-black: #e2e8f0;
  --grid-line-color: rgba(15, 23, 42, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent-cyan: #0891b2;
  --accent-cyan-hover: #0e7490;
  --accent-emerald: #059669;
  --accent-emerald-hover: #047857;
  --accent-glow: rgba(8, 145, 178, 0.08);
  --accent-glow-green: rgba(5, 150, 105, 0.08);
}

/* Light Theme Enhancements for Roundtable */
html[data-theme="light"] body {
  background-image:
    radial-gradient(circle at 50% 0%, rgba(8, 145, 178, 0.05) 0%, transparent 60%),
    radial-gradient(circle at 10% 40%, rgba(8, 145, 178, 0.02) 0%, transparent 40%);
}

html[data-theme="light"] .header {
  background: rgba(255, 255, 255, 0.85);
  border-bottom-color: var(--grid-line-color);
}

.header.scrolled {
  background: rgba(2, 2, 14, 0.95) !important;
  border-bottom-color: rgba(6, 182, 212, 0.15) !important;
}

html[data-theme="light"] .header.scrolled {
  background: rgba(255, 255, 255, 0.95) !important;
  border-bottom-color: rgba(8, 145, 178, 0.15) !important;
}

html[data-theme="light"] .logo-img-dsg,
html[data-theme="light"] .logo-img-bitdefender,
html[data-theme="light"] .logo-img-ruijie,
html[data-theme="light"] .logo-img {
  filter: invert(1) brightness(0.2) !important;
}

html[data-theme="light"] .logo-cross,
html[data-theme="light"] .logo-separator {
  color: var(--text-muted) !important;
}

html[data-theme="light"] .nav-link {
  color: var(--text-secondary);
}

html[data-theme="light"] .nav-link:hover {
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.02);
}

html[data-theme="light"] .screen-frame {
  background: #ffffff;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

html[data-theme="light"] .screen-header {
  background: #e2e8f0;
}

html[data-theme="light"] .screen-title {
  color: var(--text-secondary);
}

html[data-theme="light"] .screen-content {
  background: #f8fafc;
}

html[data-theme="light"] .about-desc-card,
html[data-theme="light"] .stat-card,
html[data-theme="light"] .speaker-card,
html[data-theme="light"] .schedule-timeline-item,
html[data-theme="light"] .ticket-card,
html[data-theme="light"] .sponsor-card-box,
html[data-theme="light"] .office-info-card,
html[data-theme="light"] .help-faq-accordion-item,
html[data-theme="light"] .venue-interactive-details-card,
html[data-theme="light"] .office-card {
  background: #ffffff !important;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04) !important;
  border-color: var(--grid-line-color) !important;
}

html[data-theme="light"] .sponsor-cta-banner {
  background: linear-gradient(135deg, #f1f5f9 0%, #e0f2fe 100%) !important;
}

html[data-theme="light"] .footer-main {
  background: #f1f5f9;
}

html[data-theme="light"] .footer-logo-img {
  filter: invert(1) brightness(0.2);
}

html[data-theme="light"] .badge-komdigi,
html[data-theme="light"] .badge-row img {
  filter: invert(1) brightness(0.2) contrast(1.5);
  border-color: rgba(0, 0, 0, 0.08);
}

/* Theme Toggle Button Common Styling */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--grid-line-color);
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  padding: 0;
  border-radius: 0;
  margin-left: 16px;
  vertical-align: middle;
}

.theme-toggle:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.05);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Toggle visibility based on data-theme */
html[data-theme="light"] .theme-toggle .sun-icon {
  display: none;
}
html[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}