/* ===== HyperOS 3 Light Theme - 首页样式 ===== */

/* ===== CSS 变量 ===== */
:root {
  --primary: #2563ff;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-glow: rgba(37, 99, 255, 0.2);
  --accent: #7c3aed;
  --accent-light: #8b5cf6;
  --accent-glow: rgba(124, 58, 237, 0.15);
  --bg: #f5f7fb;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-hover: rgba(255, 255, 255, 0.88);
  --text: #111827;
  --text-secondary: #374151;
  --text-muted: #667085;
  --text-light: #9ca3af;
  --border: rgba(0, 0, 0, 0.06);
  --border-hover: rgba(0, 0, 0, 0.1);
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.05), 0 4px 6px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.06), 0 8px 16px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.08);
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 28px;
  --radius-3xl: 32px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #f5f7fb 0%, #edf3ff 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 柔和光斑背景 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: -2;
  background:
    radial-gradient(ellipse 900px 700px at 5% 10%, rgba(59, 130, 246, 0.06), transparent 60%),
    radial-gradient(ellipse 800px 600px at 90% 90%, rgba(139, 92, 246, 0.05), transparent 60%),
    radial-gradient(ellipse 600px 500px at 50% 50%, rgba(37, 99, 255, 0.03), transparent 60%);
}

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

/* ===== 导航栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  height: 72px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: var(--shadow-xs);
  transition: all 0.3s var(--ease);
}

.header-inner {
  display: flex;
  align-items: center;
  padding: 0 40px;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  transition: opacity 0.2s var(--ease);
  flex-shrink: 0;
}
.brand:hover { opacity: 0.8; }

.brand-logo {
  width: 36px; height: 36px;
  padding: 6px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(37, 99, 255, 0.25);
}

.brand-name {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.3px;
  color: var(--text);
}

/* 桌面导航 */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 14px;
  text-decoration: none;
  color: var(--text-muted);
  transition: all 0.2s var(--ease);
  position: relative;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(37, 99, 255, 0.04);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(37, 99, 255, 0.06);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

/* 登录按钮 */
.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  padding: 10px 22px;
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  font-family: inherit;
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
  outline: none;
  transition: all 0.25s var(--ease);
  position: relative;
  overflow: hidden;
}

.header-btn {
  margin-left: auto;
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.25);
}
.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.35);
}
.btn-danger:active { transform: translateY(0) scale(0.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 255, 0.35);
}
.btn-primary:active { transform: translateY(0) scale(0.98); }

.btn-secondary {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--text-secondary);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--text-muted);
}
.btn-ghost:hover {
  background: rgba(0, 0, 0, 0.03);
  border-color: rgba(0, 0, 0, 0.12);
  color: var(--text);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: var(--radius-lg);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px; height: 40px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.06);
  cursor: pointer;
  padding: 0;
  border-radius: var(--radius-sm);
  transition: all 0.2s var(--ease);
}
.mobile-menu-toggle:hover { background: rgba(37, 99, 255, 0.06); }
.mobile-menu-toggle span {
  display: block;
  height: 2px;
  width: 20px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all 0.3s var(--ease);
  margin: 3px 0;
}
.mobile-menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-nav {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100vh;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 999;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transform: translateY(-100%);
  transition: all 0.4s var(--ease);
}
.mobile-nav.active { opacity: 1; transform: translateY(0); }
.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  text-decoration: none;
  padding: 14px 32px;
  font-size: 17px;
  font-weight: 600;
  width: 100%;
  max-width: 260px;
  border-radius: var(--radius);
  margin: 6px 0;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: all 0.2s var(--ease);
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  background: rgba(37, 99, 255, 0.06);
  border-color: rgba(37, 99, 255, 0.15);
  color: var(--primary);
}
.mobile-nav-close {
  position: absolute;
  top: 24px; right: 24px;
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--text);
  font-size: 24px;
  cursor: pointer;
  padding: 10px;
  border-radius: 50%;
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s var(--ease);
}
.mobile-nav-close:hover { background: rgba(239, 68, 68, 0.08); }

/* ===== Hero 区域 ===== */
.hero-section {
  padding: 60px 0 40px;
  position: relative;
  overflow: visible;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  min-height: 520px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37, 99, 255, 0.06);
  border: 1px solid rgba(37, 99, 255, 0.1);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  width: fit-content;
}

.badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.6); }
}

.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.7;
  color: #667085;
  max-width: 480px;
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 420px;
}

/* HyperOS 3 风格球体 */
.hyper-sphere {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: float-sphere 8s ease-in-out infinite;
}

@keyframes float-sphere {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-18px); }
}

.sphere-core {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(37, 99, 255, 0.15), rgba(139, 92, 246, 0.15), rgba(37, 99, 255, 0.1));
  position: relative;
  box-shadow:
    inset 0 0 80px rgba(255, 255, 255, 0.3),
    inset -30px -20px 60px rgba(37, 99, 255, 0.1),
    inset 30px 20px 60px rgba(139, 92, 246, 0.08),
    0 0 60px rgba(37, 99, 255, 0.1),
    0 20px 40px rgba(37, 99, 255, 0.08);
}

.sphere-core::before {
  content: '';
  position: absolute;
  top: 20%; left: 22%;
  width: 45%;
  height: 35%;
  background: radial-gradient(ellipse, rgba(255, 255, 255, 0.7), transparent 70%);
  border-radius: 50%;
  transform: rotate(-20deg);
  filter: blur(8px);
}

.sphere-core::after {
  content: '';
  position: absolute;
  bottom: 25%; right: 20%;
  width: 18%;
  height: 12%;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  filter: blur(4px);
}

.sphere-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(37, 99, 255, 0.1);
  animation: ring-rotate 20s linear infinite;
}

.sphere-ring:nth-child(2) {
  width: 290px; height: 290px;
  border-color: rgba(139, 92, 246, 0.08);
  animation-duration: 25s;
  animation-direction: reverse;
}

.sphere-ring:nth-child(3) {
  width: 200px; height: 200px;
  border-color: rgba(37, 99, 255, 0.06);
  animation-duration: 18s;
  transform: rotateX(60deg);
}

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

.sphere-glow {
  position: absolute;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 255, 0.06), transparent 70%);
  filter: blur(40px);
  animation: glow-pulse 4s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.08); }
}

/* ===== 功能卡片区域 ===== */
.features-section {
  padding: 40px 0 100px;
}

.section-label {
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  text-align: center;
  font-size: clamp(28px, 3.5vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 14px;
}

.section-subtitle {
  text-align: center;
  font-size: 16px;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 56px;
  line-height: 1.6;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 36px 28px;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  transition: all 0.35s var(--ease);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-color: rgba(255, 255, 255, 0.6);
}

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

.feature-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(37, 99, 255, 0.08), rgba(139, 92, 246, 0.06));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: var(--primary);
  transition: all 0.3s var(--ease);
}

.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, rgba(37, 99, 255, 0.15), rgba(139, 92, 246, 0.1));
  box-shadow: 0 8px 24px rgba(37, 99, 255, 0.12);
  transform: scale(1.05);
}

.feature-icon svg {
  width: 28px; height: 28px;
  stroke-width: 1.5;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ===== ROM 展示区域 ===== */
.roms-section {
  padding: 60px 0 100px;
}

.roms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.rom-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xs);
  padding: 28px 24px 24px;
  text-align: center;
  transition: all 0.35s var(--ease);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.rom-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(0, 0, 0, 0.08);
}

.rom-device-img {
  width: 120px;
  height: 140px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(37, 99, 255, 0.04), rgba(139, 92, 246, 0.03));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.rom-device-img::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 70px; height: 110px;
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(37, 99, 255, 0.15), rgba(139, 92, 246, 0.1));
  border: 2px solid rgba(37, 99, 255, 0.15);
}

.rom-device-img::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 55px; height: 90px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.5);
  z-index: 1;
  box-shadow: 0 4px 16px rgba(37, 99, 255, 0.08);
}

.rom-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 8px;
}

.rom-version-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(37, 99, 255, 0.06);
  border: 1px solid rgba(37, 99, 255, 0.1);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 16px;
}

.rom-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  text-decoration: none;
}

.rom-download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 255, 0.3);
}

/* ===== 底部 CTA ===== */
.cta-section {
  padding: 60px 0 100px;
}

.cta-card {
  background: linear-gradient(135deg, rgba(37, 99, 255, 0.04), rgba(139, 92, 246, 0.03));
  border: 1px solid rgba(37, 99, 255, 0.08);
  border-radius: var(--radius-3xl);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -100px; left: 50%;
  transform: translateX(-50%);
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(37, 99, 255, 0.06), transparent 70%);
  pointer-events: none;
}

.cta-card h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 12px;
  position: relative;
}

.cta-card p {
  font-size: 16px;
  color: var(--text-muted);
  margin: 0 0 32px;
  position: relative;
}

.cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 48px 0 32px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  background: rgba(255, 255, 255, 0.3);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 10px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 14px;
}

.footer-links ul { list-style: none; padding: 0; margin: 0; }

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

.footer-links a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.footer-links a:hover { color: var(--primary); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(0, 0, 0, 0.04);
}

.copyright {
  font-size: 13px;
  color: var(--text-light);
}

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

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.03);
  color: var(--text-muted);
  transition: all 0.2s var(--ease);
}

.social-link:hover {
  background: rgba(37, 99, 255, 0.08);
  color: var(--primary);
  transform: translateY(-2px);
}

/* ===== 淡入动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s var(--ease);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 - 平板 ===== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; min-height: auto; }
  .hero-visual { min-height: 320px; }
  .hero-content { text-align: center; align-items: center; }
  .hero-subtitle { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .roms-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .container { width: calc(100% - 32px); }
  .site-header { top: 0; height: 60px; }
  .header-inner { padding: 0 16px; }
  .nav { display: none; }
  .mobile-menu-toggle { display: flex; }
  .mobile-nav { display: flex; }
  .brand-name { font-size: 15px; }
  .brand-logo { width: 30px; height: 30px; padding: 5px; }
  .hero-section { padding: 40px 0 60px; }
  .hyper-sphere { width: 240px; height: 240px; }
  .sphere-core { width: 180px; height: 180px; }
  .sphere-ring:nth-child(2) { width: 220px; height: 220px; }
  .sphere-ring:nth-child(3) { width: 150px; height: 150px; }
  .sphere-glow { width: 260px; height: 260px; }
  .hero-title { font-size: 28px; }
  .section-title { font-size: 24px; }
  .features-grid { grid-template-columns: 1fr; }
  .roms-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .cta-card { padding: 40px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 12px; }
}

@media (max-width: 480px) {
  .container { width: calc(100% - 24px); }
  .hero-title { font-size: 24px; }
  .hero-subtitle { font-size: 14px; }
  .hero-visual { min-height: 240px; }
  .hyper-sphere { width: 200px; height: 200px; }
  .sphere-core { width: 150px; height: 150px; }
  .sphere-ring:nth-child(2) { width: 180px; height: 180px; }
  .sphere-ring:nth-child(3) { width: 120px; height: 120px; }
  .sphere-glow { width: 220px; height: 220px; }
  .roms-grid { grid-template-columns: 1fr; }
  .btn-lg { padding: 12px 24px; font-size: 14px; }
  .cta-card h2 { font-size: 22px; }
}