/* ============================================
   三角洲行动辅助 — 军事硬核设计系统
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

html:not(.wwee) body {
            filter: blur(10px);
            -webkit-filter: blur(10px);
        }
        body {
            transition: filter 0.5s ease, opacity 0.5s ease;
        }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #1a1d20;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  color: #a0a3a6;
  line-height: 1.6;
  font-weight: 400;
  min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.03em;
  color: #e8e6e3;
  line-height: 1.15;
}

.section-title {
  font-size: 38px;
  text-align: center;
  position: relative;
  padding-bottom: 28px;
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26,29,32,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #2a2d30;
  padding: 0 32px;
  height: 64px;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
}

.nav-brand {
  font-weight: 900;
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #e8e6e3;
  text-decoration: none;
}

.nav-brand span {
  color: #f04e23;
}

/* --- Buttons (cut-corner) --- */
.btn {
  display: inline-block;
  text-decoration: none;
  font-family: inherit;
  font-weight: 700;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 14px 36px;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.2s ease;
  border: none;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: #f04e23;
  color: #fff;
}

.btn-primary:hover {
  background: #d43d1a;
  filter: brightness(1.08);
}

.btn-outline {
  background: transparent;
  border: 2px solid #3a4a3a;
  color: #e8e6e3;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.btn-outline:hover {
  border-color: #4a7c59;
  background: rgba(58,74,58,0.15);
}

.btn-sm {
  font-size: 13px;
  padding: 10px 24px;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  padding: 120px 32px 100px;
  text-align: center;
  overflow: hidden;
  min-height: 580px;
}

.hero-crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 520px;
  height: 520px;
  border: 2px solid rgba(255,255,255,0.04);
  border-radius: 50%;
  pointer-events: none;
}

.hero-crosshair::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 280px;
  border: 1px solid rgba(240,78,35,0.12);
  border-radius: 50%;
}

.hero-badge {
  display: inline-block;
  border: 1px solid #3a4a3a;
  color: #4a7c59;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 8px 20px;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  margin-bottom: 32px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.hero h1 span {
  color: #f04e23;
}

.hero-subtitle {
  font-size: 18px;
  color: #7a7d80;
  max-width: 560px;
  margin: 0 auto 40px;
  position: relative;
  z-index: 1;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* --- Crosshair Divider --- */
.divider-crosshair {
  text-align: center;
  padding: 0;
  margin: 0;
  line-height: 0;
}

.divider-line {
  display: inline-block;
  width: 80px;
  height: 1px;
  background: #2a2d30;
  vertical-align: middle;
}

.divider-diamond {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 1px solid #3a4a3a;
  transform: rotate(45deg);
  vertical-align: middle;
  margin: 0 14px;
  position: relative;
  top: -1px;
}

.divider-diamond::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 6px;
  height: 6px;
  background: #f04e23;
  opacity: 0.6;
}

/* --- Container --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* --- Section Spacing --- */
.section {
  padding: 90px 0;
}

/* --- Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: #2a2d30;
  margin-top: 48px;
}

.feature-card {
  background: #222528;
  padding: 40px 32px;
  border: none;
  position: relative;
  text-align: center;
  transition: background 0.2s ease;
}

.feature-card:hover {
  background: #262a2d;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #3a4a3a, transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border: 1px solid #2a2d30;
  margin: 0 auto 20px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 26px;
  height: 26px;
  fill: #f04e23;
}

.feature-card h4 {
  font-size: 16px;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.feature-card p {
  font-size: 14px;
  color: #7a7d80;
  line-height: 1.6;
}

/* Corner Marks */
.corner-mark {
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: #f04e23;
  border-style: solid;
  opacity: 0.4;
}

.corner-tl {
  top: 10px;
  left: 10px;
  border-width: 2px 0 0 2px;
}

.corner-tr {
  top: 10px;
  right: 10px;
  border-width: 2px 2px 0 0;
}

.corner-bl {
  bottom: 10px;
  left: 10px;
  border-width: 0 0 2px 2px;
}

.corner-br {
  bottom: 10px;
  right: 10px;
  border-width: 0 2px 2px 0;
}

/* --- Screenshot Gallery --- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: #2a2d30;
  margin-top: 48px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  background: #141618;
}

.gallery-item img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
  filter: brightness(0.9) saturate(1.1);
  transition: filter 0.3s ease, transform 0.3s ease;
}

.gallery-item:hover img {
  filter: brightness(1) saturate(1.2);
  transform: scale(1.03);
}

.gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid transparent;
  transition: border-color 0.3s ease;
  pointer-events: none;
}

.gallery-item:hover::after {
  border-color: #f04e23;
}

.gallery-label {
  position: absolute;
  bottom: 16px;
  left: 16px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #e8e6e3;
  background: rgba(20,22,24,0.88);
  padding: 6px 14px;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  z-index: 1;
}

/* --- Advantages --- */
.advantages-list {
  max-width: 700px;
  margin: 48px auto 0;
  counter-reset: adv;
}

.adv-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid #2a2d30;
}

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

.adv-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: 2px solid #3a4a3a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 18px;
  color: #f04e23;
}

.adv-num::before {
  counter-increment: adv;
  content: counter(adv, decimal-leading-zero);
}

.adv-content h4 {
  font-size: 16px;
  text-transform: none;
  letter-spacing: 0;
  margin-bottom: 6px;
}

.adv-content p {
  font-size: 14px;
  color: #7a7d80;
}

/* --- Platform Cards --- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: #2a2d30;
  margin-top: 48px;
}

.platform-card {
  background: #222528;
  padding: 40px 24px;
  text-align: center;
  position: relative;
  transition: background 0.2s ease;
}

.platform-card:hover {
  background: #262a2d;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #f04e23, transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

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

.platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 30px;
  height: 30px;
  fill: #a0a3a6;
}

.platform-card h4 {
  font-size: 18px;
  margin-bottom: 8px;
}

.platform-card p {
  font-size: 13px;
  color: #7a7d80;
  margin-bottom: 20px;
}

/* --- Steps --- */
.steps-list {
  max-width: 800px;
  margin: 48px auto 0;
  position: relative;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  padding: 20px 0;
  position: relative;
}

.step-num {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border: 1px solid #3a4a3a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 22px;
  color: #f04e23;
  background: #1a1d20;
  position: relative;
  z-index: 1;
}

.step-num::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
}

.step-content h4 {
  font-size: 17px;
  text-transform: none;
  letter-spacing: 0;
  margin-bottom: 6px;
}

.step-content p {
  font-size: 14px;
  color: #7a7d80;
}

/* Step connecting line */
.steps-list {
  counter-reset: step;
}

.step-item+.step-item::before {
  content: '';
  position: absolute;
  left: 26px;
  top: -14px;
  width: 1px;
  height: 14px;
  background: #2a2d30;
}

/* --- FAQ --- */
.faq-list {
  max-width: 700px;
  margin: 48px auto 0;
}

.faq-item {
  padding: 24px 0;
  border-bottom: 1px solid #2a2d30;
}

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

.faq-q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-weight: 700;
  color: #e8e6e3;
  font-size: 16px;
  cursor: default;
}

.faq-q::before {
  content: 'Q';
  flex-shrink: 0;
  font-weight: 900;
  color: #f04e23;
  font-size: 20px;
}

.faq-a {
  padding-left: 34px;
  margin-top: 10px;
  font-size: 14px;
  color: #7a7d80;
  line-height: 1.7;
}

/* --- Refund Form --- */
.refund-form {
  background: #222528;
  border: 1px solid #2a2d30;
  padding: 40px 36px;
  margin-top: 48px;
  position: relative;
}

.refund-form::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #f04e23, transparent);
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #e8e6e3;
  margin-bottom: 10px;
}

.form-input {
  width: 100%;
  background: #141618;
  border: 1px solid #2a2d30;
  color: #e8e6e3;
  font-family: inherit;
  font-size: 15px;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  border-color: #f04e23;
}

.form-input::placeholder {
  color: #55585b;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.6;
}

.form-hint {
  text-align: center;
  font-size: 13px;
  color: #55585b;
  margin-top: 16px;
}

/* Submit success state */
.form-success {
  text-align: center;
  padding: 32px 0;
}

.form-success-icon {
  width: 56px;
  height: 56px;
  border: 2px solid #3a4a3a;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.form-success-icon svg {
  width: 26px;
  height: 26px;
  fill: #4a7c59;
}

.form-success h4 {
  font-size: 16px;
  color: #e8e6e3;
  margin-bottom: 6px;
}

.form-success p {
  font-size: 14px;
  color: #7a7d80;
}

/* --- Refund CTA --- */
.refund-cta {
  background: #222528;
  border: 1px solid #2a2d30;
  padding: 48px 40px;
  text-align: center;
  position: relative;
  margin-top: 48px;
}

.refund-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 2px;
  background: #f04e23;
}

.refund-cta h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

.refund-cta p {
  color: #7a7d80;
  margin-bottom: 24px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  background: #141618;
  border-top: 1px solid #2a2d30;
  padding: 40px 32px 32px;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.footer-links a {
  color: #55585b;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #f04e23;
}

.footer-copy {
  font-size: 12px;
  color: #44474a;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero {
    padding: 80px 24px 64px;
  }
  .hero h1 {
    font-size: 34px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  .platform-grid {
    grid-template-columns: 1fr;
  }
  .section-title {
    font-size: 28px;
  }
  .section {
    padding: 60px 0;
  }
  .container {
    padding: 0 20px;
  }
  .nav {
    padding: 0 20px;
  }
  .step-item+.step-item::before {
    display: none;
  }
  .step-item {
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 26px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .section-title {
    font-size: 24px;
  }
  .feature-card {
    padding: 28px 20px;
  }
  .btn {
    padding: 12px 28px;
    font-size: 13px;
  }
}