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

[hidden] {
  display: none !important;
}

body {
  font-family: -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
  background: linear-gradient(160deg, #f0f5ff 0%, #fafbff 40%, #fff8f0 100%);
  color: #1a1a1a;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  z-index: -1;
  opacity: 0.4;
}

body::before {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08), transparent 70%);
  top: -120px;
  right: -100px;
}

body::after {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.06), transparent 70%);
  bottom: -150px;
  left: -120px;
}

/* ===== 首屏 ===== */
.hero {
  text-align: center;
  max-width: 900px;
  width: 100%;
  animation: fadeUp 0.6s ease;
}

.hero-logo {
  width: clamp(64px, 8vw, 96px);
  height: auto;
  margin-bottom: 16px;
  border-radius: 20px;
}

.hero h1 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 700;
  margin-bottom: 8px;
}

.rename-note {
  font-size: 0.85rem;
  color: #999;
  margin-bottom: 8px;
}

.subtitle {
  font-size: 1.1rem;
  color: #666;
  margin-bottom: 48px;
}

/* 三卡片 */
.cards {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: clamp(24px, 3vw, 40px) clamp(20px, 2.5vw, 32px);
  border-radius: 16px;
  width: clamp(200px, 18vw, 280px);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
}

.card-icon {
  font-size: clamp(2rem, 2.5vw, 2.8rem);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
}

.card-desc {
  font-size: 0.85rem;
}

.card-sub {
  font-size: 0.8rem;
  color: #888;
}

.card-locked {
  background: #f5f5f5;
  border: 1px solid #e0e0e0;
  cursor: default;
}

.card-locked .card-desc {
  color: #999;
}

.card-locked:hover {
  transform: none;
}

.card-active {
  background: linear-gradient(135deg, #fff7ed, #fef3c7);
  border: 1px solid #fbbf24;
  cursor: pointer;
}

.card-active:hover {
  box-shadow: 0 4px 16px rgba(251, 191, 36, 0.2);
}

.card-active .card-desc {
  color: #d97706;
  font-weight: 500;
}

/* 验证码输入 */
.code-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.code-area input {
  width: 360px;
  max-width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  outline: none;
  transition: border-color 0.2s;
}

.code-area input:focus {
  border-color: #3b82f6;
}

.code-area input.error {
  border-color: #ef4444;
}

#code-btn {
  padding: 12px 48px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: #3b82f6;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

#code-btn:hover {
  background: #2563eb;
}

#code-btn:active {
  transform: scale(0.97);
}

.code-error {
  color: #ef4444;
  font-size: 0.85rem;
}

/* ===== 下载区 ===== */
.download-section {
  max-width: 800px;
  width: 100%;
  text-align: center;
  animation: fadeUp 0.5s ease;
}

.os-hint {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 32px;
}

.os-hint strong {
  color: #16a34a;
}

.download-cards {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.dl-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 28px;
  border-radius: 16px;
  border: 1px solid #e5e7eb;
  background: #fff;
  width: 320px;
  transition: box-shadow 0.2s;
}

.dl-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.dl-badge {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: #3b82f6;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 20px;
}

.dl-icon {
  font-size: 2.2rem;
}

.dl-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
}

.dl-card p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.6;
}

.dl-btn {
  text-decoration: none;
  text-align: center;
  border-radius: 10px;
  transition: all 0.2s;
}

.dl-btn-main {
  display: block;
  width: 100%;
  padding: 13px 0;
  font-size: 1rem;
  font-weight: 600;
  color: #3b82f6;
  border: 2px solid #3b82f6;
  background: #fff;
}

.dl-btn-main:hover {
  background: #eff6ff;
  transform: translateY(-1px);
}

.dl-btn-sub {
  font-size: 0.85rem;
  color: #3b82f6;
  padding: 4px 0;
}

.dl-btn-sub:hover {
  text-decoration: underline;
}

/* ===== 魔法上网区 ===== */
.vpn-section {
  max-width: 600px;
  width: 100%;
  margin-top: 64px;
  text-align: center;
}

.vpn-box h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 700;
  margin-bottom: 14px;
}

.vpn-lead {
  font-size: 0.95rem;
  color: #555;
  line-height: 1.8;
  margin-bottom: 28px;
}

.vpn-highlight {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  border: 1px solid #fde68a;
  border-radius: 20px;
  padding: 36px 28px;
}

.vpn-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: #92400e;
  margin-bottom: 12px;
}

.vpn-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 8px;
}

.vpn-price-num {
  font-size: 3.2rem;
  font-weight: 800;
  color: #ea580c;
  line-height: 1;
}

.vpn-price-unit {
  font-size: 1.1rem;
  color: #9a3412;
  font-weight: 500;
}

.vpn-traffic {
  font-size: 0.9rem;
  color: #78716c;
  margin-bottom: 20px;
}

.vpn-points {
  list-style: none;
  text-align: left;
  display: inline-block;
  margin-bottom: 24px;
}

.vpn-points li {
  font-size: 0.9rem;
  color: #44403c;
  padding: 5px 0;
}

.vpn-btn {
  display: inline-block;
  padding: 14px 44px;
  background: #f97316;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 12px;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
  animation: breathe 2.5s ease-in-out infinite;
}

.vpn-btn:hover {
  background: #ea580c;
  transform: scale(1.03);
}

.vpn-more {
  font-size: 0.8rem;
  color: #a8a29e;
  margin-top: 12px;
}

/* ===== 教程区 ===== */
.tutorial-section {
  max-width: 600px;
  width: 100%;
  margin-top: 56px;
  text-align: center;
}

.tutorial-box {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
  padding: 36px 28px;
}

.tutorial-box h2 {
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.tutorial-box p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.7;
  margin-bottom: 20px;
}

.tutorial-btn {
  display: inline-block;
  padding: 12px 36px;
  color: #3b82f6;
  border: 2px solid #3b82f6;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s;
}

.tutorial-btn:hover {
  background: #eff6ff;
}

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.25s ease;
  padding: 20px;
}

.modal-box {
  position: relative;
  background: #fff;
  border-radius: 20px;
  padding: 36px 32px 28px;
  max-width: 440px;
  width: 100%;
  animation: scaleIn 0.3s ease;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.2rem;
  color: #999;
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.modal-close:hover {
  background: #f3f4f6;
  color: #333;
}

.modal-section {
  text-align: center;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.modal-sub {
  font-size: 0.85rem;
  color: #888;
}

.modal-divider {
  height: 1px;
  background: #f0f0f0;
  margin: 20px 0;
}

.modal-vpn {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  border-radius: 12px;
  padding: 20px 16px;
  margin: 0 -8px;
}

.modal-vpn-head {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.modal-vpn p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #444;
  margin-bottom: 8px;
}

.modal-vpn-rec {
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.modal-vpn-btn {
  display: inline-block;
  padding: 11px 32px;
  background: #f97316;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
  animation: breathe 2.5s ease-in-out infinite;
}

.modal-vpn-btn:hover {
  background: #ea580c;
  transform: scale(1.03);
}

.modal-vpn-more {
  font-size: 0.8rem;
  color: #999;
  margin-top: 8px;
}

.modal-tutorial {
  display: inline-block;
  font-size: 0.9rem;
  color: #3b82f6;
  text-decoration: none;
  padding: 8px 0;
}

.modal-tutorial:hover {
  text-decoration: underline;
}

.modal-confirm {
  display: block;
  margin: 20px auto 0;
  padding: 10px 40px;
  font-size: 0.9rem;
  color: #666;
  background: #f3f4f6;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s;
}

.modal-confirm:hover {
  background: #e5e7eb;
}

/* ===== 动画 ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(249, 115, 22, 0); }
}

/* ===== 响应式 ===== */
@media (max-width: 680px) {
  .cards {
    flex-direction: column;
    align-items: center;
  }
  .card {
    width: 100%;
    max-width: 280px;
  }
  .download-cards {
    flex-direction: column;
    align-items: center;
  }
  .dl-card {
    width: 100%;
    max-width: 320px;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
}