:root {
  --primary: #11A84E;
  --primary-dark: #0A4B2C;
  --primary-light: #22C768;
  --card-bg: #11271B;
  --bg-dark: #08160F;
  --text-main: #F2FFF6;
  --text-secondary: #A7D9B8;
  --border-color: #2E7A4E;
  --glow: #57E38D;
  --gold: #F2C14E;
  --divider: #1E3A2A;
  --deep-green: #0A4B2C;
  --button-gradient-start: #2AD16F;
  --button-gradient-end: #13994A;
  --button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  --header-top-bg: #0A4B2C;
  --nav-bg: #0D1B12;
  --header-offset: 122px;
  box-sizing: border-box;
}

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

body {
  padding-top: var(--header-offset);
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
  width: 100%;
}

body.no-scroll {
  overflow: hidden;
}

/* ===== HEADER BASE (Desktop-first) ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
  min-height: auto;
  background: var(--header-top-bg);
}

.header-top {
  background-color: var(--header-top-bg);
  width: 100%;
  border-bottom: 1px solid var(--divider);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 20px;
  gap: 20px;
}

.logo {
  display: inline-block;
  font-size: 28px;
  font-weight: 900;
  color: var(--text-main);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
  transition: color 0.3s ease;
}

.logo:hover {
  color: var(--glow);
}

.desktop-nav-buttons {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: #fff;
  background: var(--button-gradient);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 0 rgba(87, 227, 141, 0);
  min-height: 40px;
}

.btn:hover {
  box-shadow: 0 4px 16px rgba(87, 227, 141, 0.4);
  transform: translateY(-2px);
  color: #fff;
  text-decoration: none;
}

.btn-register, .btn-download, .btn-login, .btn-support {
  background: var(--button-gradient);
}

.btn-login {
  background: linear-gradient(180deg, #F2C14E, #C89B2E);
  color: #08160F;
}

.btn-download {
  background: linear-gradient(180deg, #22C768, #0A4B2C);
}

/* ===== MAIN NAV (Desktop) ===== */
.main-nav {
  position: static;
  display: flex;
  flex-direction: row;
  width: 100%;
  background-color: var(--nav-bg);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
}

.nav-container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  gap: 4px;
  flex-wrap: wrap;
  width: 100%;
}

.nav-link {
  display: inline-block;
  padding: 16px 14px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.3s ease, background-color 0.3s ease;
  border-radius: 4px 4px 0 0;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
}

.nav-link:hover {
  color: var(--glow);
  background-color: rgba(17, 168, 78, 0.15);
  border-bottom-color: var(--glow);
}

/* ===== HAMBURGER & MOBILE (hidden on desktop) ===== */
.hamburger-menu {
  display: none;
}

.mobile-menu-overlay {
  display: none;
}

.mobile-nav-buttons {
  display: none;
}

/* ===== FOOTER (Desktop) ===== */
.site-footer {
  background-color: var(--deep-green);
  color: var(--text-main);
  padding: 50px 0 0;
  border-top: 2px solid var(--border-color);
}

.footer-container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-column h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--gold);
}

.footer-logo {
  font-size: 26px;
  font-weight: 900;
  color: var(--text-main);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 15px;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.3s ease;
}

.footer-logo:hover {
  color: var(--glow);
}

.footer-desc {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
  margin-top: 10px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

.footer-nav a:hover {
  color: var(--glow);
}

.footer-contact p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 8px;
}

.footer-btn-wrapper {
  margin-top: 15px;
}

.btn-support {
  margin-top: 15px;
  display: inline-block;
}

.footer-bottom {
  background-color: var(--bg-dark);
  padding: 18px 0;
  border-top: 1px solid var(--divider);
  text-align: center;
}

.copyright {
  color: var(--text-secondary);
  font-size: 14px;
}

.copyright-year {
  color: var(--gold);
  font-weight: 700;
}

/* ===== PAGE CONTENT ===== */
.page-content {
  max-width: 100%;
  overflow-x: hidden;
}

/* ===== RESPONSIVE CSS (max-width: 768px) ===== */
@media (max-width: 768px) {
  :root {
    --header-offset: 144px;
  }

  .site-header {
    background: var(--header-top-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  }

  .header-top {
    background: var(--header-top-bg);
    border-bottom: 1px solid var(--divider);
  }

  .header-container {
    width: 100%;
    max-width: none;
    padding: 8px 16px;
    gap: 8px;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .logo {
    font-size: 22px;
    width: 100%;
    text-align: center;
    padding-top: 6px;
    padding-bottom: 6px;
    order: 2;
  }

  .desktop-nav-buttons {
    display: none;
  }

  .mobile-nav-buttons {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 16px;
    background-color: var(--deep-green);
    border-bottom: 1px solid var(--divider);
    position: relative;
    z-index: 1001;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    overflow-x: auto;
    white-space: nowrap;
  }

  .btn-mobile {
    flex-shrink: 0;
    padding: 10px 12px;
    font-size: 13px;
    min-height: 38px;
  }

  .main-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    overflow-y: auto;
    background-color: var(--card-bg);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: 70px 20px 20px;
    transform: translateX(-100%);
    transition: transform 0.35s ease;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.4);
    z-index: 1002;
    border-right: 2px solid var(--border-color);
  }

  .main-nav.active {
    display: block;
    transform: translateX(0);
  }

  .nav-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding: 0;
    align-items: stretch;
  }

  .nav-link {
    padding: 15px 10px;
    border-bottom: 1px solid var(--divider);
    border-radius: 0;
    font-size: 15px;
    color: var(--text-main);
    width: 100%;
    display: block;
  }

  .nav-link:hover {
    background-color: rgba(17, 168, 78, 0.2);
  }

  .mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1003;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease;
  }

  .mobile-menu-overlay.active {
    display: block;
    opacity: 1;
    visibility: visible;
  }

  .hamburger-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
    z-index: 1005;
    position: absolute;
    left: 16px;
    top: 20px;
    order: 1;
  }

  .hamburger-menu .hamburger-line {
    width: 26px;
    height: 3px;
    background-color: var(--text-main);
    border-radius: 3px;
    transition: all 0.3s ease;
    display: block;
  }

  .hamburger-menu.active .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
    background-color: var(--glow);
  }

  .hamburger-menu.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .hamburger-menu.active .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
    background-color: var(--glow);
  }

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

  .footer-logo {
    font-size: 22px;
  }

  .footer-column h4 {
    margin-bottom: 15px;
  }

  .footer-nav {
    gap: 8px;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .footer-nav a {
    margin-right: 10px;
  }

  .site-footer {
    padding-top: 40px;
  }

  .footer-container {
    padding: 0 0 25px;
  }

  .footer-column {
    width: 100%;
  }

  .footer-contact .btn-support {
    width: 100%;
    text-align: center;
  }

  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }

  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }

  body {
    overflow-x: hidden;
  }
}

@media (max-width: 480px) {
  :root {
    --header-offset: 142px;
  }

  .container {
    padding-left: 12px;
    padding-right: 12px;
  }

  .btn-mobile {
    padding: 8px 8px;
    font-size: 12px;
  }
}

@media (max-width: 360px) {
  .btn-mobile {
    font-size: 11px;
    padding: 8px 4px;
  }
}

@media (min-width: 769px) and (max-width: 992px) {
  .nav-link {
    padding: 14px 10px;
    font-size: 13px;
  }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}
/* 内容保护（系统追加，请勿删除） */
body {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
input, textarea, select, [contenteditable="true"] {
  -webkit-user-select: text;
  -moz-user-select: text;
  user-select: text;
}