/* ===== BoxCraft 2026 Official Website ===== */
/* Brand: Black #1A1A1A + Green #00C853 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root,
[data-theme="dark"] {
  --green: #00C853;
  --green-dark: #00a344;
  --green-light: #00e676;
  --green-glow: rgba(0, 200, 83, 0.3);
  --green-subtle: rgba(0, 200, 83, 0.06);
  --black: #0a0a0a;
  --dark: #111111;
  --dark-card: #161616;
  --dark-card-hover: #1c1c1c;
  --dark-border: #252525;
  --white: #ffffff;
  --gray: #888888;
  --light-gray: #cccccc;
  --font-en: 'Inter', sans-serif;
  --font-cn: 'Noto Sans SC', 'PingFang SC', sans-serif;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(0, 200, 83, 0.12);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --green: #00873e;
  --green-dark: #006830;
  --green-light: #00a344;
  --green-glow: rgba(0, 135, 62, 0.18);
  --green-subtle: rgba(0, 135, 62, 0.06);
  --black: #ffffff;
  --dark: #f8f9fa;
  --dark-card: #ffffff;
  --dark-card-hover: #f0f1f2;
  --dark-border: #e0e0e0;
  --white: #1a1a1a;
  --gray: #888888;
  --light-gray: #444444;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 40px rgba(0, 135, 62, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
  max-width: 100%;
}

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-cn);
  line-height: 1.7;
  overflow-x: hidden;
  max-width: 100vw;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  opacity: 0.85;
  text-shadow: 0 0 12px var(--green-glow);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== NAV ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0 24px;
  overflow: visible;
}

nav .nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

nav .nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

nav .nav-logo img {
  height: 36px;
  width: auto;
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.4)) drop-shadow(0 0 2px rgba(255, 255, 255, 0.6));
}

nav .nav-logo span {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

nav .nav-logo .year {
  color: var(--green);
}

/* 汉堡按钮：桌面端隐藏 */
.hamburger {
  display: none;
}

nav .nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
  list-style: none;
}

nav .nav-links a {
  color: var(--light-gray);
  font-size: 0.9rem;
  font-weight: 400;
  transition: color 0.2s;
}

nav .nav-links a:hover {
  color: var(--white);
  opacity: 1;
}

.btn-primary {
  display: inline-block;
  padding: 12px 32px;
  background: var(--green);
  color: var(--black);
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-cn);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255, 255, 255, 0.2) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.btn-primary:hover {
  background: var(--green-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 200, 83, 0.4), 0 0 60px rgba(0, 200, 83, 0.15);
  opacity: 1;
}

.btn-primary:hover::after {
  transform: translateX(100%);
}

.btn-outline {
  display: inline-block;
  padding: 12px 32px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--white);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-cn);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(0, 200, 83, 0.08);
  border-color: var(--green);
  opacity: 1;
  transform: translateY(-2px);
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  background: radial-gradient(circle, rgba(0, 200, 83, 0.15) 0%, rgba(0, 200, 83, 0.05) 40%, transparent 70%);
  opacity: 1;
  pointer-events: none;
  animation: pulseGlow 6s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 200, 83, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

@keyframes pulseGlow {

  0%,
  100% {
    opacity: 0.6;
    transform: translateX(-50%) scale(1);
  }

  50% {
    opacity: 1;
    transform: translateX(-50%) scale(1.05);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-logo {
  width: 160px;
  height: auto;
  margin-bottom: 32px;
  animation: float 4s ease-in-out infinite;
  filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.3)) drop-shadow(0 0 6px rgba(255, 255, 255, 0.5)) drop-shadow(0 0 40px rgba(0, 200, 83, 0.2));
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.hero h1 {
  font-family: var(--font-en);
  font-size: 5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff 60%, rgba(255, 255, 255, 0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .year {
  background: linear-gradient(135deg, var(--green), var(--green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.3rem;
  color: var(--light-gray);
  font-weight: 400;
  margin-bottom: 32px;
  letter-spacing: 0.1em;
}

.hero .slogan {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  line-height: 1.4;
}

.hero .slogan .highlight {
  color: var(--green);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats .stat {
  text-align: center;
  padding: 16px 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(8px);
  transition: all var(--transition-smooth);
  min-width: 120px;
}

.hero-stats .stat:hover {
  border-color: rgba(0, 200, 83, 0.3);
  background: rgba(0, 200, 83, 0.05);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.hero-stats .stat-value {
  font-family: var(--font-en);
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stats .stat-label {
  font-size: 0.8rem;
  color: var(--gray);
  margin-top: 4px;
  letter-spacing: 0.02em;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* ===== SECTIONS ===== */
section {
  padding: 100px 24px;
}

.section-title {
  text-align: center;
  margin-bottom: 64px;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.section-title p {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

.section-title .green {
  color: var(--green);
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.about-text p {
  color: var(--light-gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-feature {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  transition: all var(--transition-smooth);
}

.about-feature:hover {
  border-color: var(--green);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  background: var(--dark-card-hover);
}

.about-feature .icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.about-feature .label {
  font-size: 0.85rem;
  color: var(--gray);
  margin-bottom: 4px;
}

.about-feature .value {
  font-weight: 700;
  font-size: 1.1rem;
}

/* ===== TRACKS ===== */
.tracks-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.track-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.track-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--green), var(--green-dark));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.track-card:hover {
  border-color: rgba(0, 200, 83, 0.4);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  background: var(--dark-card-hover);
}

.track-card:hover::before {
  opacity: 1;
}

.track-card .track-label {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.track-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.track-card p {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== TIMELINE ===== */
.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--dark-border);
}

.timeline-item {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  position: relative;
}

.timeline-dot {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: 50%;
  background: var(--dark-card);
  border: 2px solid var(--dark-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 1;
  transition: all 0.3s;
}

.timeline-item:hover .timeline-dot {
  border-color: var(--green);
  box-shadow: 0 0 12px var(--green-glow);
}

.timeline-item.active .timeline-dot {
  border-color: var(--green);
  background: var(--green);
}

.timeline-content {
  padding-bottom: 8px;
}

.timeline-content .date {
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--green);
  margin-bottom: 4px;
}

.timeline-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-content p {
  font-size: 0.85rem;
  color: var(--gray);
}

/* ===== PRIZES ===== */
.prizes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto 48px;
}

.prize-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition-smooth);
}

.prize-card:hover {
  border-color: var(--green);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.prize-card.gold {
  border-color: rgba(255, 215, 0, 0.5);
  background: linear-gradient(135deg, var(--dark-card) 0%, rgba(255, 215, 0, 0.04) 100%);
}

.prize-card.gold:hover {
  box-shadow: 0 0 40px rgba(255, 215, 0, 0.15);
  border-color: #ffd700;
}

.prize-card.gold .prize-icon {
  color: #ffd700;
}

.prize-card .prize-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.prize-card .prize-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.prize-card .prize-amount {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--green);
}

.prize-card .prize-count {
  font-size: 0.8rem;
  color: var(--gray);
  margin-top: 4px;
}

.prizes-extra {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.prizes-extra .extra-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--light-gray);
  font-size: 0.9rem;
}

.prizes-extra .extra-item .icon {
  font-size: 1.2rem;
}

/* ===== WHO ===== */
.who-tags {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 700px;
  margin: 0 auto;
}

.who-tag {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 40px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--transition-smooth);
  cursor: default;
}

.who-tag:hover {
  border-color: var(--green);
  background: rgba(0, 200, 83, 0.06);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.who-tag .icon {
  margin-right: 8px;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--dark-border);
}

.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  transition: color 0.2s;
}

.faq-q:hover {
  color: var(--green);
}

.faq-q .arrow {
  font-size: 1.2rem;
  transition: transform 0.3s;
  color: var(--gray);
}

.faq-item.open .faq-q .arrow {
  transform: rotate(180deg);
  color: var(--green);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  color: var(--gray);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-a {
  max-height: 200px;
  padding-bottom: 20px;
}

/* ===== CTA ===== */
.cta-section {
  text-align: center;
  padding: 100px 24px;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, var(--green-glow) 0%, transparent 70%);
  opacity: 0.2;
  pointer-events: none;
}

.cta-section h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
}

.cta-section p {
  color: var(--gray);
  font-size: 1.1rem;
  margin-bottom: 32px;
  position: relative;
}

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--dark-border);
  padding: 48px 24px;
  text-align: center;
}

footer .organizers {
  font-size: 0.9rem;
  color: var(--gray);
  margin-bottom: 16px;
}

footer .org-row {
  margin-bottom: 4px;
}

footer .org-row:first-child {
  font-size: 0.95rem;
  color: var(--light-gray);
}

footer .organizers strong {
  color: var(--light-gray);
}

footer .copyright {
  font-size: 0.8rem;
  color: #555;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.8rem;
  }

  .hero .slogan {
    font-size: 1.4rem;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-stats .stat-value {
    font-size: 1.6rem;
  }

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

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

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

  /* --- 汉堡按钮 --- */
  .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    z-index: 9999;
    position: relative;
    flex-shrink: 0;
  }

  .hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
  }

  .hamburger.active span {
    background: var(--green);
  }

  .hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* --- 移动端全屏菜单 --- */
  nav .nav-links {
    position: absolute;
    top: 64px;
    left: -24px;
    right: -24px;
    height: 100vh;
    height: 100dvh;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    background: rgba(8, 8, 16, 0.98);
    backdrop-filter: blur(32px) saturate(200%);
    -webkit-backdrop-filter: blur(32px) saturate(200%);
    padding: 40px 24px 80px;
    gap: 0;
    z-index: 9998;
    overflow-y: auto;
    /* 初始状态：透明 + 上移 */
    display: flex;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 200, 83, 0.08),
      inset 0 1px 0 rgba(255, 255, 255, 0.06);
    border-top: 1px solid rgba(0, 200, 83, 0.15);
  }

  nav .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  nav .nav-links li {
    text-align: center;
    width: 100%;
    max-width: 320px;
  }

  nav .nav-links li:first-child a {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }

  nav .nav-links a {
    display: block;
    padding: 16px 0;
    font-size: 1.1rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: color 0.2s, text-shadow 0.2s, padding-left 0.2s;
    letter-spacing: 0.02em;
  }

  nav .nav-links a:hover,
  nav .nav-links a:active {
    color: var(--green);
    text-shadow: 0 0 20px rgba(0, 200, 83, 0.6);
    padding-left: 8px;
  }

  nav .nav-links li:last-child a {
    border-bottom: none;
  }

  /* 报名按钮特殊样式 */
  nav .nav-links li:last-child a.btn-primary,
  nav .nav-links .btn-primary {
    margin: 20px auto 0;
    padding: 14px 40px;
    border-radius: 8px;
    font-size: 1rem;
    box-shadow: 0 0 30px rgba(0, 200, 83, 0.3);
    width: auto;
    display: inline-block;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .section-title h2 {
    font-size: 1.8rem;
  }
}

/* ===== ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation for grids */
.fade-in.visible .track-card,
.fade-in.visible .prize-card,
.fade-in.visible .about-feature,
.fade-in.visible .who-tag {
  animation: slideUp 0.5s ease forwards;
}

.fade-in.visible .track-card:nth-child(1) {
  animation-delay: 0s;
}

.fade-in.visible .track-card:nth-child(2) {
  animation-delay: 0.1s;
}

.fade-in.visible .track-card:nth-child(3) {
  animation-delay: 0.2s;
}

.fade-in.visible .track-card:nth-child(4) {
  animation-delay: 0.3s;
}

.fade-in.visible .prize-card:nth-child(1) {
  animation-delay: 0s;
}

.fade-in.visible .prize-card:nth-child(2) {
  animation-delay: 0.1s;
}

.fade-in.visible .prize-card:nth-child(3) {
  animation-delay: 0.2s;
}

.fade-in.visible .prize-card:nth-child(4) {
  animation-delay: 0.3s;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Selection styling */
::selection {
  background: rgba(0, 200, 83, 0.3);
  color: #fff;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--dark-border);
  border-radius: 4px;
}

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

/* ===== LIGHT MODE OVERRIDES ===== */
/* Fixes hardcoded rgba(white, ...) values that break in light theme */

[data-theme="light"] body {
  background: #f5f6f8;
  color: #1a1a1a;
  transition: background 0.3s, color 0.3s;
}

/* Nav */
[data-theme="light"] nav {
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

/* Logo: replace white glow with green glow */
[data-theme="light"] nav .nav-logo img {
  filter: drop-shadow(0 0 6px rgba(0, 135, 62, 0.5)) drop-shadow(0 0 2px rgba(0, 135, 62, 0.3));
}

[data-theme="light"] nav .nav-logo span {
  color: #1a1a1a;
}

[data-theme="light"] nav .nav-links a {
  color: #555555;
}

[data-theme="light"] nav .nav-links a:hover {
  color: #1a1a1a;
}

/* Hero background radial glow – stronger in light */
[data-theme="light"] .hero::before {
  background: radial-gradient(circle, rgba(0, 135, 62, 0.2) 0%, rgba(0, 135, 62, 0.08) 40%, transparent 70%);
}

[data-theme="light"] .hero::after {
  background: radial-gradient(circle, rgba(0, 135, 62, 0.12) 0%, transparent 70%);
}

/* Hero logo: replace white glow with dark+green glow */
[data-theme="light"] .hero-logo {
  filter:
    drop-shadow(0 4px 12px rgba(0, 0, 0, 0.2)) drop-shadow(0 0 20px rgba(0, 135, 62, 0.35)) drop-shadow(0 0 6px rgba(0, 135, 62, 0.5));
}

/* Hero h1: replace white gradient with dark gradient */
[data-theme="light"] .hero h1 {
  background: linear-gradient(135deg, #0a0a0a 60%, #333333);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Hero stats cards */
[data-theme="light"] .hero-stats .stat {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(0, 135, 62, 0.2);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .hero-stats .stat:hover {
  border-color: rgba(0, 135, 62, 0.5);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 4px 24px rgba(0, 135, 62, 0.15);
}

/* Btn outline */
[data-theme="light"] .btn-outline {
  background: rgba(0, 0, 0, 0.03);
  color: #1a1a1a;
  border: 1.5px solid rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .btn-outline:hover {
  background: rgba(0, 135, 62, 0.08);
  border-color: var(--green);
}

/* Cards hover border glow enhancement */
[data-theme="light"] .track-card:hover {
  border-color: rgba(0, 135, 62, 0.5);
  box-shadow: 0 0 28px rgba(0, 135, 62, 0.12), 0 8px 32px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .about-feature:hover {
  box-shadow: 0 0 24px rgba(0, 135, 62, 0.15), 0 4px 16px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .prize-card:hover {
  box-shadow: 0 0 24px rgba(0, 135, 62, 0.15), 0 8px 24px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .who-tag:hover {
  background: rgba(0, 135, 62, 0.08);
  box-shadow: 0 0 12px rgba(0, 135, 62, 0.15);
}

[data-theme="light"] .timeline-item:hover .timeline-dot {
  box-shadow: 0 0 12px rgba(0, 135, 62, 0.3);
}

/* Organizer logos background */
[data-theme="light"] .org-logo {
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

/* Section backgrounds */
[data-theme="light"] section:nth-child(even) {
  background: rgba(255, 255, 255, 0.6);
}

/* FAQ, scrollbar etc */
[data-theme="light"] ::-webkit-scrollbar-track {
  background: #f0f0f0;
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: #cccccc;
}

[data-theme="light"] ::selection {
  background: rgba(0, 135, 62, 0.2);
  color: #1a1a1a;
}