/* ==========================================================================
   响应式设计规范 (320px, 375px, 390px, 428px, 768px, 1024px, 1440px)
   轻语机场 (qingyujc.lol) · 框架31 森林晨雾
   ========================================================================== */

/* 1440px 宽屏及以上 */
@media (min-width: 1440px) {
  :root {
    --max-width: 1280px;
  }
  .hero-title {
    font-size: 3.5rem;
  }
}

/* 1024px 平板横屏与小型笔电 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 100%;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 360px;
    margin-left: auto;
    margin-right: auto;
    gap: 12px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .pricing-card-3d {
    padding: 28px 20px;
  }

  .plan-name {
    font-size: 1.55rem;
  }

  .price-num {
    font-size: 2.2rem;
  }

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

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

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* 768px 平板竖屏与大屏手机 */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .container {
    padding-left: 14px;
    padding-right: 14px;
  }

  /* 顶部导航紧凑化，彻底杜绝横向撑出 */
  .logo-badge-3d {
    width: 34px;
    height: 34px;
  }

  .brand-logo-link {
    gap: 8px;
  }

  .brand-slogan-tiny {
    display: none;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-name .highlight {
    display: none;
  }

  .nav-actions {
    gap: 6px;
  }

  .nav-actions .btn {
    padding: 6px 10px;
    font-size: 0.78rem;
    white-space: nowrap;
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px 8px;
    flex-shrink: 0;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(2, 18, 13, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 18px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.6);
  }

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

  /* 首屏徽章与标题 */
  .framework-badge {
    font-size: 0.74rem;
    padding: 4px 10px;
    white-space: normal;
    text-align: center;
    line-height: 1.4;
  }

  .hero-title {
    font-size: clamp(1.65rem, 5vw, 2.1rem);
    line-height: 1.25;
  }

  .hero-desc {
    font-size: 0.95rem;
    padding: 0 4px;
  }

  /* 核心指标统计带 */
  .hero-features-strip {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
    margin: 0 auto;
    gap: 4px;
    padding: 16px 0 0 0;
    text-align: center;
  }

  .stat-item {
    flex: 1;
    min-width: 0;
    text-align: center;
  }

  .stat-value {
    font-size: 1.15rem;
    white-space: nowrap;
  }

  .stat-value .unit {
    font-size: 0.72rem;
  }

  .stat-label {
    font-size: 0.66rem;
    white-space: nowrap;
  }

  /* 3D视觉缩放 */
  .hero-3d-visual {
    min-height: 320px;
  }

  .sphere-stage-3d {
    width: 260px;
    height: 260px;
  }

  .crystal-core-sphere {
    width: 150px;
    height: 150px;
    margin-top: -75px;
    margin-left: -75px;
  }

  .crystal-mist-aura {
    width: 220px;
    height: 220px;
    margin-top: -110px;
    margin-left: -110px;
  }

  .orbit-ring-1 {
    width: 220px;
    height: 220px;
    margin-top: -110px;
    margin-left: -110px;
  }

  .orbit-ring-2 {
    width: 250px;
    height: 250px;
    margin-top: -125px;
    margin-left: -125px;
  }

  .ftc-1 {
    right: 0;
    top: 5px;
  }

  .ftc-2 {
    left: 0;
    bottom: 5px;
  }

  /* 套餐单列布局 */
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
    gap: 24px;
  }

  .pricing-card-3d.is-featured {
    transform: none;
  }

  .pricing-card-3d.is-featured:hover {
    transform: translateY(-6px);
  }

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

  .steps-container {
    grid-template-columns: 1fr;
  }

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

  .feedback-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .feedback-box {
    padding: 30px 18px;
  }

  .bottom-cta-card {
    padding: 36px 18px;
  }

  .bottom-cta-title {
    font-size: 1.75rem;
  }
}

/* 428px, 390px, 375px, 320px 移动端细节精准适配 */
@media (max-width: 428px) {
  .container {
    padding-left: 12px;
    padding-right: 12px;
  }

  .hero-title {
    font-size: 1.65rem;
    line-height: 1.25;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .cycle-switcher {
    width: 100%;
    justify-content: space-between;
  }

  .cycle-btn {
    padding: 6px 8px;
    font-size: 0.76rem;
  }

  .pricing-card-3d {
    padding: 24px 16px;
  }

  .plan-name {
    font-size: 1.5rem;
  }

  .price-num {
    font-size: 2.2rem;
  }

  .section {
    padding: 65px 0;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* 320px 超小屏机型极值保护 */
@media (max-width: 320px) {
  .hero-title {
    font-size: 1.5rem;
  }

  .btn {
    font-size: 0.82rem;
    padding: 8px 14px;
  }

  .brand-name {
    font-size: 0.95rem;
  }

  .pricing-badge-recommend {
    top: 12px;
    right: 12px;
    font-size: 0.68rem;
  }
}