/* ============================================
   SSC Research Station - Main Stylesheet
   Theme: Clockwork Mechanical Steampunk
   ============================================ */

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

:root {
  --color-primary: #1A1A2E;
  --color-secondary: #C0A060;
  --color-accent: #4A4A6A;
  --color-text: #D0D0D0;
  --color-link: #C0A060;
  --color-dark: #0D0D1A;
  --color-card: rgba(26, 26, 46, 0.85);
  --color-border: rgba(192, 160, 96, 0.3);
  --font-cn: 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
  --font-en: 'Roboto Condensed', sans-serif;
  --max-width: 1440px;
  --header-height: 70px;
}

/* --- Interference tags (anti-duplicate) --- */
.ssc-interference, .clock-interference {
  display: none;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-cn);
  background-color: var(--color-primary);
  color: var(--color-text);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #e0c080;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-cn);
  color: var(--color-secondary);
  line-height: 1.4;
  margin-bottom: 0.8em;
}

h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.4rem; }

p {
  margin-bottom: 1.2em;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-secondary);
}

/* ============================================
   Header / Navigation
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
  background-color: transparent;
}

.site-header.scrolled {
  background-color: rgba(26, 26, 46, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
}

.logo-text {
  font-family: var(--font-en);
  font-size: 1.2rem;
  color: var(--color-secondary);
  font-weight: 700;
  letter-spacing: 1px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-link {
  position: relative;
  padding: 8px 18px;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: color 0.3s ease;
  white-space: nowrap;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background-color: var(--color-secondary);
  transition: transform 0.3s ease;
}

.nav-link:hover {
  color: var(--color-secondary);
}

.nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown .dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: rgba(26, 26, 46, 0.96);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: 10px 20px;
  color: var(--color-text);
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.dropdown-menu a:hover {
  color: var(--color-secondary);
  background: rgba(192, 160, 96, 0.08);
  padding-left: 26px;
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-secondary);
  transition: all 0.3s ease;
  border-radius: 2px;
}

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

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

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

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background: rgba(13, 13, 26, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: 30px 20px;
  overflow-y: auto;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: 16px 0;
  font-size: 1.1rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav a:hover {
  color: var(--color-secondary);
}

.mobile-nav .mobile-sub {
  padding-left: 20px;
}

.mobile-nav .mobile-sub a {
  font-size: 0.95rem;
  color: var(--color-accent);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/hero-bg.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(13,13,26,0.4) 0%, rgba(26,26,46,0.85) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 20px;
}

.hero-content h1 {
  font-size: 3rem;
  color: var(--color-secondary);
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(192, 160, 96, 0.3);
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--color-text);
  margin-bottom: 40px;
  opacity: 0.9;
}

.btn-primary {
  display: inline-block;
  padding: 14px 40px;
  background: linear-gradient(135deg, #C0A060, #a08040);
  color: var(--color-primary);
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 2px;
  box-shadow: 0 4px 20px rgba(192, 160, 96, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(192, 160, 96, 0.5);
  color: var(--color-primary);
}

.btn-secondary {
  display: inline-block;
  padding: 12px 32px;
  background: transparent;
  color: var(--color-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  border: 2px solid var(--color-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(192, 160, 96, 0.1);
  color: var(--color-secondary);
}

/* Gear animation in hero */
.gear-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

/* ============================================
   Live Data Ticker
   ============================================ */
.ticker-section {
  background: var(--color-dark);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
  overflow: hidden;
}

.ticker-wrap {
  display: flex;
  animation: ticker-scroll 30s linear infinite;
  white-space: nowrap;
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  padding: 0 40px;
  font-family: var(--font-en);
  font-size: 0.9rem;
  color: var(--color-text);
}

.ticker-item .lottery-name {
  color: var(--color-secondary);
  margin-right: 10px;
  font-weight: 700;
}

.ticker-item .lottery-num {
  display: inline-flex;
  gap: 6px;
}

.ticker-item .num-ball {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-secondary), #a08040);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.8rem;
}

@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ============================================
   Section Common Styles
   ============================================ */
.section {
  padding: 80px 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.section-title p {
  color: var(--color-accent);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-title .gear-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
}

.gear-divider .line {
  width: 60px;
  height: 1px;
  background: var(--color-border);
}

.gear-divider .gear-icon {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-secondary);
  border-radius: 50%;
  position: relative;
  animation: gear-spin 8s linear infinite;
}

.gear-divider .gear-icon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  background: var(--color-secondary);
  border-radius: 50%;
}

@keyframes gear-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ============================================
   Feature Introduction
   ============================================ */
.feature-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feature-image {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.feature-image img {
  width: 100%;
  transition: transform 0.5s ease;
}

.feature-image:hover img {
  transform: scale(1.03);
}

.feature-text h2 {
  font-size: 1.8rem;
}

.feature-text p {
  color: var(--color-text);
  opacity: 0.85;
}

/* ============================================
   Article Cards
   ============================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.article-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.4s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(192, 160, 96, 0.15);
  border-color: var(--color-secondary);
}

.article-card .card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.article-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .card-image img {
  transform: scale(1.08);
}

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

.article-card .card-tag {
  display: inline-block;
  padding: 3px 12px;
  background: rgba(192, 160, 96, 0.15);
  color: var(--color-secondary);
  font-size: 0.75rem;
  border-radius: 20px;
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  line-height: 1.5;
}

.article-card h3 a {
  color: var(--color-secondary);
}

.article-card h3 a:hover {
  color: #e0c080;
}

.article-card .card-excerpt {
  font-size: 0.88rem;
  color: var(--color-accent);
  line-height: 1.7;
  margin-bottom: 16px;
}

.article-card .card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-accent);
}

/* ============================================
   Category Navigation (Gauge Style)
   ============================================ */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.category-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 30px 20px;
  text-align: center;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(192,160,96,0.05) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

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

.category-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-secondary);
  box-shadow: 0 8px 30px rgba(192, 160, 96, 0.12);
}

.category-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border: 2px solid var(--color-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--color-secondary);
  position: relative;
}

.category-icon::after {
  content: '';
  position: absolute;
  width: 90px;
  height: 90px;
  border: 1px dashed var(--color-border);
  border-radius: 50%;
  animation: gear-spin 20s linear infinite;
}

.category-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 0.85rem;
  color: var(--color-accent);
}

/* ============================================
   Data Toolbox
   ============================================ */
.toolbox-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tool-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 30px;
  transition: all 0.3s ease;
}

.tool-card:hover {
  border-color: var(--color-secondary);
  transform: translateY(-3px);
}

.tool-card .tool-icon {
  font-size: 2rem;
  color: var(--color-secondary);
  margin-bottom: 16px;
}

.tool-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.tool-card p {
  font-size: 0.88rem;
  color: var(--color-accent);
}

/* ============================================
   Community Highlights
   ============================================ */
.community-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.community-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px 24px;
  transition: all 0.3s ease;
}

.community-item:hover {
  border-color: var(--color-secondary);
  background: rgba(192, 160, 96, 0.05);
}

.community-item .topic-rank {
  font-family: var(--font-en);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-secondary);
  min-width: 40px;
}

.community-item .topic-info {
  flex: 1;
}

.community-item .topic-info h4 {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 4px;
}

.community-item .topic-info h4 a {
  color: var(--color-text);
}

.community-item .topic-info h4 a:hover {
  color: var(--color-secondary);
}

.community-item .topic-meta {
  font-size: 0.8rem;
  color: var(--color-accent);
}

.community-item .topic-replies {
  font-family: var(--font-en);
  font-size: 0.85rem;
  color: var(--color-secondary);
  white-space: nowrap;
}

/* ============================================
   Awards Section
   ============================================ */
.awards-content {
  display: flex;
  align-items: center;
  gap: 50px;
  max-width: 900px;
  margin: 0 auto;
}

.awards-badge {
  flex-shrink: 0;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-secondary);
  box-shadow: 0 0 30px rgba(192, 160, 96, 0.2);
}

.awards-badge img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.awards-text h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.awards-text p {
  font-size: 0.95rem;
  color: var(--color-text);
  opacity: 0.85;
}

/* ============================================
   Partners
   ============================================ */
.partners-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 30px;
}

.partner-item {
  padding: 16px 28px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--color-accent);
  transition: all 0.3s ease;
}

.partner-item:hover {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-dark);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--color-secondary);
  font-size: 1rem;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: var(--color-accent);
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.footer-col ul li a:hover {
  color: var(--color-secondary);
}

.footer-col p {
  font-size: 0.88rem;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.footer-badge {
  margin-top: 16px;
}

.footer-badge img {
  width: 60px;
  border-radius: 50%;
  border: 2px solid var(--color-secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.footer-bottom a {
  color: var(--color-accent);
  font-size: 0.82rem;
}

.footer-bottom a:hover {
  color: var(--color-secondary);
}

.beian-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.beian-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.beian-links img {
  width: 16px;
  height: 16px;
  display: inline-block;
}

/* ============================================
   Breadcrumb
   ============================================ */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--color-accent);
}

.breadcrumb a {
  color: var(--color-accent);
}

.breadcrumb a:hover {
  color: var(--color-secondary);
}

.breadcrumb span {
  margin: 0 8px;
  color: var(--color-accent);
}

/* ============================================
   Inner Page Layout
   ============================================ */
.page-header {
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 40px;
  background: var(--color-dark);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.page-header p {
  color: var(--color-accent);
}

.inner-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  padding: 40px 0;
}

.main-content {
  min-width: 0;
}

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 20px);
  align-self: start;
}

.sidebar-widget {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-widget h4 {
  color: var(--color-secondary);
  font-size: 1rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-widget ul {
  list-style: none;
}

.sidebar-widget ul li {
  margin-bottom: 10px;
}

.sidebar-widget ul li a {
  color: var(--color-text);
  font-size: 0.9rem;
}

.sidebar-widget ul li a:hover {
  color: var(--color-secondary);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud a {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(192, 160, 96, 0.1);
  color: var(--color-accent);
  font-size: 0.82rem;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.tag-cloud a:hover {
  background: rgba(192, 160, 96, 0.2);
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

/* ============================================
   Article Detail
   ============================================ */
.article-content {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 40px;
}

.article-content h2 {
  font-size: 1.5rem;
  margin-top: 30px;
}

.article-content h3 {
  font-size: 1.2rem;
  margin-top: 24px;
}

.article-content p {
  font-size: 0.95rem;
  line-height: 2;
}

.article-content img {
  border-radius: 8px;
  margin: 20px 0;
  border: 1px solid var(--color-border);
}

.article-content blockquote {
  border-left: 3px solid var(--color-secondary);
  padding: 16px 20px;
  margin: 20px 0;
  background: rgba(192, 160, 96, 0.05);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--color-accent);
}

/* Comment Section */
.comment-section {
  margin-top: 40px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 30px;
}

.comment-section h3 {
  margin-bottom: 20px;
}

.comment-form textarea {
  width: 100%;
  min-height: 120px;
  background: var(--color-dark);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  color: var(--color-text);
  font-family: var(--font-cn);
  font-size: 0.95rem;
  resize: vertical;
  margin-bottom: 16px;
}

.comment-form textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
}

.comment-list {
  margin-top: 30px;
}

.comment-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.comment-item:last-child {
  border-bottom: none;
}

.comment-author {
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 6px;
}

.comment-date {
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-left: 12px;
  font-weight: 400;
}

.comment-text {
  font-size: 0.92rem;
  color: var(--color-text);
  opacity: 0.9;
}

/* ============================================
   Time Gear Tool Page
   ============================================ */
.tool-layout {
  display: grid;
  grid-template-columns: 260px 1fr 300px;
  gap: 24px;
  padding: 30px 0;
}

.control-panel {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
}

.control-panel h3 {
  font-size: 1rem;
  margin-bottom: 20px;
}

.control-group {
  margin-bottom: 20px;
}

.control-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.control-group select,
.control-group input {
  width: 100%;
  padding: 10px 12px;
  background: var(--color-dark);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  font-size: 0.9rem;
  font-family: var(--font-cn);
}

.control-group select:focus,
.control-group input:focus {
  outline: none;
  border-color: var(--color-secondary);
}

.viz-area {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viz-area canvas {
  max-width: 100%;
}

.data-summary {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
}

.data-summary h3 {
  font-size: 1rem;
  margin-bottom: 16px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.88rem;
}

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

.stat-label {
  color: var(--color-accent);
}

.stat-value {
  color: var(--color-secondary);
  font-family: var(--font-en);
  font-weight: 700;
}

/* ============================================
   APP Download Page
   ============================================ */
.app-hero {
  text-align: center;
  padding: 60px 20px;
}

.app-hero .app-logo {
  width: 100px;
  height: 100px;
  margin: 0 auto 20px;
  border-radius: 20px;
  overflow: hidden;
  border: 2px solid var(--color-secondary);
}

.app-screenshots {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 40px 0;
  overflow-x: auto;
}

.app-screenshots img {
  width: 240px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin: 30px 0;
}

.app-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 40px 0;
}

.app-feature-item {
  text-align: center;
  padding: 24px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.app-feature-item .feature-icon {
  font-size: 2rem;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.app-feature-item h4 {
  color: var(--color-secondary);
  font-size: 1rem;
  margin-bottom: 8px;
}

.app-feature-item p {
  font-size: 0.85rem;
  color: var(--color-accent);
}

/* ============================================
   Loading Animation
   ============================================ */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  pointer-events: none;
}

.loader-gear {
  width: 60px;
  height: 60px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-secondary);
  border-radius: 50%;
  animation: gear-spin 1s linear infinite;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet: 768px */
@media (max-width: 1024px) {
  .feature-intro {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

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

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

  .inner-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .tool-layout {
    grid-template-columns: 1fr;
  }

  .awards-content {
    flex-direction: column;
    text-align: center;
  }

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }

  .main-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

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

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

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

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

  .article-content {
    padding: 24px;
  }

  .app-features {
    grid-template-columns: 1fr;
  }

  .app-screenshots img {
    width: 180px;
  }

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

@media (max-width: 360px) {
  .container {
    padding: 0 12px;
  }

  .hero-content h1 {
    font-size: 1.6rem;
  }

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

  .btn-primary {
    padding: 12px 28px;
    font-size: 0.9rem;
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-gold { color: var(--color-secondary); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }

/* Lazy load fade-in */
.lazy-fade {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.lazy-fade.loaded {
  opacity: 1;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}