/* ==========================================================================
   SPANDA DESIGN SYSTEM & MAIN STYLESHEET
   ========================================================================== */

/* 1. GLOBAL RESETS & BASE STYLES */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-body);
  background-color: var(--color-navy-darkest);
  color: var(--color-text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  background: radial-gradient(circle at 50% 0%, #0c1629 0%, var(--color-navy-darkest) 70%);
  min-height: 100vh;
}

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

a:hover {
  color: #66f4ff;
}

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

/* 2. TYPOGRAPHY SYSTEM */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  color: #FFFFFF;
  letter-spacing: -0.02em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-signal-blue);
  margin-bottom: 0.75rem;
}

.eyebrow-red {
  color: var(--color-heartbeat-red);
}

.display-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  text-transform: uppercase;
  font-weight: 800;
  background: linear-gradient(135deg, #FFFFFF 40%, var(--color-text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 3.25rem);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.lead-text {
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: var(--color-text-muted);
  max-width: 760px;
  margin-bottom: 2rem;
  font-weight: 400;
}

/* 3. BUTTONS & UI INTERACTION */
.spanda-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 2rem;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
}

.spanda-btn-primary {
  background: linear-gradient(135deg, var(--color-heartbeat-red) 0%, #D00028 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 20px var(--color-heartbeat-glow);
}

.spanda-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(255, 30, 66, 0.6);
  color: #FFFFFF;
}

.spanda-btn-secondary {
  background: rgba(0, 240, 255, 0.05);
  color: var(--color-signal-blue);
  border-color: rgba(0, 240, 255, 0.3);
  backdrop-filter: blur(10px);
}

.spanda-btn-secondary:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--color-signal-blue);
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
  color: #FFFFFF;
}

.spanda-btn-outline {
  background: transparent;
  color: var(--color-text-main);
  border-color: var(--color-navy-border);
}

.spanda-btn-outline:hover {
  border-color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.05);
}

/* 4. HEADER & NAVBAR */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.25rem 0;
  transition: var(--transition-smooth);
}

.site-header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  padding: 0.85rem 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.header-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo-img {
  height: 42px;
  width: auto;
  object-fit: contain;
}

.main-nav-list {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 0.4rem 0;
}

.nav-link:hover, .nav-link.active {
  color: #FFFFFF;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-heartbeat-red);
  transition: var(--transition-smooth);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #FFFFFF;
  font-size: 1.5rem;
  cursor: pointer;
}

/* 5. HERO SECTION & ANIMATED SIGNAL */
.hero-section {
  position: relative;
  min-height: 100vh;
  padding-top: 9rem;
  padding-bottom: 5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 30%, rgba(0, 102, 255, 0.15) 0%, rgba(6, 11, 20, 0.95) 75%);
  overflow: hidden;
}

.hero-glow-bg {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 30, 66, 0.12) 0%, rgba(0, 240, 255, 0.08) 40%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.hero-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-title {
  font-size: clamp(2.8rem, 5.5vw, 5.2rem);
  letter-spacing: -0.02em;
  max-width: 1100px;
  margin: 0 auto 1.5rem auto;
}

.hero-sub {
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  color: var(--color-text-muted);
  max-width: 840px;
  margin: 0 auto 2.5rem auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

/* SPANDA SIGNAL PIPELINE BAR */
.spanda-signal-pipeline {
  margin-top: 2rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.75rem 1.5rem;
  backdrop-filter: blur(12px);
  position: relative;
}

.signal-nodes-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1rem;
  position: relative;
}

.signal-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  cursor: pointer;
  transition: var(--transition-smooth);
  padding: 0.75rem 0.5rem;
  border-radius: 8px;
}

.signal-node:hover, .signal-node.active {
  background: rgba(0, 240, 255, 0.08);
}

.signal-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-navy-surface);
  border: 1px solid var(--color-navy-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
  transition: var(--transition-smooth);
}

.signal-node:hover .signal-icon-box,
.signal-node.active .signal-icon-box {
  border-color: var(--color-signal-blue);
  color: var(--color-signal-blue);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
}

.node-title {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #FFFFFF;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.node-desc {
  font-size: 0.72rem;
  color: var(--color-text-dim);
  line-height: 1.2;
}

/* Connecting Line across Nodes */
.signal-connector-line {
  position: absolute;
  top: 36px;
  left: 7%;
  right: 7%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-navy-border) 0%, var(--color-signal-blue) 50%, var(--color-heartbeat-red) 100%);
  z-index: 0;
  pointer-events: none;
}

.signal-pulse-dot {
  position: absolute;
  top: -4px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-heartbeat-red);
  box-shadow: 0 0 12px var(--color-heartbeat-red);
  animation: pulseMove 6s infinite linear;
}

@keyframes pulseMove {
  0% { left: 0%; opacity: 1; }
  100% { left: 100%; opacity: 0.2; }
}

/* 6. COMMON SECTION LAYOUTS */
.spanda-section {
  padding: 6rem 0;
  position: relative;
}

.spanda-section-dark {
  background: var(--color-navy-dark);
  border-top: 1px solid var(--color-navy-border);
  border-bottom: 1px solid var(--color-navy-border);
}

.section-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-header-center {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem auto;
}

/* 7. SECTION 02: THE BIG IDEA */
.big-idea-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.idea-flow-card {
  background: var(--color-navy-card);
  border: 1px solid var(--color-navy-border);
  border-radius: 12px;
  padding: 2.5rem;
  position: relative;
}

.flow-step-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.flow-step-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-navy-surface);
  border-radius: 8px;
  border-left: 3px solid var(--color-signal-blue);
  transition: var(--transition-smooth);
}

.flow-step-item:hover {
  transform: translateX(6px);
  border-left-color: var(--color-heartbeat-red);
  background: rgba(14, 24, 42, 0.9);
}

.flow-step-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-signal-blue);
}

/* 8. SECTION 03: PLATFORM LAYERS (4 CARDS / TABS) */
.platform-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.platform-card {
  background: var(--glass-bg);
  border: 1px solid var(--color-navy-border);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  transition: var(--transition-smooth);
}

.platform-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-border);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.platform-card:nth-child(1):hover::before { background: #00F0FF; }
.platform-card:nth-child(2):hover::before { background: #FF1E42; }
.platform-card:nth-child(3):hover::before { background: #0066FF; }
.platform-card:nth-child(4):hover::before { background: #FFD700; }

.card-layer-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.feature-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.feature-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  color: var(--color-text-main);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* 9. SECTION 04 & 09: TABLE TENNIS BEACHHEAD */
.beachhead-hero-card {
  background: linear-gradient(135deg, rgba(10, 17, 32, 0.95) 0%, rgba(20, 5, 12, 0.95) 100%), url('../images/banner-signal.jpg');
  background-size: cover;
  background-position: center;
  border: 1px solid var(--color-navy-border);
  border-radius: 16px;
  padding: 4rem 3rem;
  position: relative;
  overflow: hidden;
}

.beachhead-pathways-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-top: 3rem;
}

.pathway-item {
  background: rgba(6, 11, 20, 0.8);
  border: 1px solid var(--color-navy-border);
  border-radius: 8px;
  padding: 1.25rem 1rem;
  text-align: center;
  transition: var(--transition-smooth);
}

.pathway-item:hover {
  border-color: var(--color-heartbeat-red);
  background: rgba(255, 30, 66, 0.1);
  transform: translateY(-4px);
}

.pathway-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-heartbeat-red);
  margin-bottom: 0.25rem;
}

.pathway-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
}

/* 10. SECTION 05: PLAYER VAULT PROFILE SHOWCASE */
.player-vault-showcase {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
  background: var(--color-navy-card);
  border: 1px solid var(--color-navy-border);
  border-radius: 14px;
  padding: 2rem;
}

.player-sidebar {
  background: var(--color-navy-surface);
  border-radius: 10px;
  padding: 1.5rem;
  border: 1px solid var(--color-navy-border);
}

.player-avatar-box {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-heartbeat-red));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: #FFFFFF;
  margin: 0 auto 1rem auto;
  box-shadow: 0 0 20px rgba(0, 102, 255, 0.3);
}

.player-name {
  text-align: center;
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.player-rank {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-signal-blue);
  margin-bottom: 1.5rem;
}

.player-stat-row {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
}

.player-main-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.vault-tab-nav {
  display: flex;
  gap: 1rem;
  border-bottom: 1px solid var(--color-navy-border);
  padding-bottom: 0.75rem;
}

.vault-tab-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
}

.vault-tab-btn.active {
  background: rgba(0, 240, 255, 0.1);
  color: var(--color-signal-blue);
}

/* 11. SECTION 06: PERFORMANCE INTELLIGENCE DATA COURT */
.court-vis-wrap {
  background: #070F1B;
  border: 1px solid var(--color-navy-border);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
}

.table-tennis-court {
  width: 100%;
  height: 280px;
  border: 2px solid var(--color-signal-blue);
  background: rgba(0, 102, 255, 0.04);
  position: relative;
  border-radius: 4px;
  overflow: hidden;
}

.court-net {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #FFFFFF;
  box-shadow: 0 0 10px #FFFFFF;
}

.ball-trajectory-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 8px var(--color-gold);
}

/* 12. SECTION 07 & 08: SPANDA SELECT STOREFRONT */
.select-products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.select-card {
  background: #080D17;
  border: 1px solid var(--color-navy-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: var(--transition-smooth);
}

.select-card:hover {
  border-color: var(--color-gold);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(255, 215, 0, 0.1);
}

.product-cat-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.product-title {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.product-price {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-top: 1rem;
}

/* 13. SECTION 10: ALREADY IN THE GAME METRICS */
.metric-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  text-align: center;
}

.metric-card {
  background: var(--glass-bg);
  border: 1px solid var(--color-navy-border);
  border-radius: 12px;
  padding: 2.25rem 1.5rem;
}

.metric-number {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-signal-blue);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

/* 14. SECTION 11: FLYWHEEL ANIMATION */
.flywheel-container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: 4rem 0;
}

.flywheel-center {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-heartbeat-red) 0%, var(--color-navy-card) 70%);
  border: 2px solid var(--color-heartbeat-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: #FFFFFF;
  box-shadow: 0 0 30px var(--color-heartbeat-glow);
  z-index: 2;
}

.flywheel-loop {
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 2px dashed rgba(0, 240, 255, 0.3);
  animation: spinFlywheel 35s linear infinite;
}

@keyframes spinFlywheel {
  100% { transform: rotate(360deg); }
}

/* 15. FOOTER STYLES */
.site-footer {
  background: #020509;
  border-top: 1px solid var(--color-navy-border);
  padding: 4rem 0 2rem 0;
  color: var(--color-text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand-tagline {
  margin-top: 1rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  text-transform: uppercase;
  color: #FFFFFF;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-link:hover {
  color: var(--color-signal-blue);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
}

/* 16. RESPONSIVE TRANSFORMATIONS */
@media (max-width: 1024px) {
  .signal-nodes-grid { grid-template-columns: repeat(4, 1fr); }
  .platform-cards-grid { grid-template-columns: 1fr 1fr; }
  .beachhead-pathways-grid { grid-template-columns: repeat(3, 1fr); }
  .select-products-grid { grid-template-columns: 1fr 1fr; }
  .metric-strip-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .main-nav-list { display: none; }
  .mobile-menu-toggle { display: block; }
  .signal-nodes-grid { grid-template-columns: 1fr; gap: 0.75rem; }
  .signal-connector-line { display: none; }
  .big-idea-grid { grid-template-columns: 1fr; }
  .platform-cards-grid { grid-template-columns: 1fr; }
  .player-vault-showcase { grid-template-columns: 1fr; }
  .beachhead-pathways-grid { grid-template-columns: 1fr; }
  .select-products-grid { grid-template-columns: 1fr; }
  .metric-strip-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}