/* ==========================================
   八一建军节 99 周年喜庆海报
   配色：红色 / 金色 / 暖黄
   feature-id: jianjun99-haibao-20260817
   ========================================== */

/* ---------- 设计令牌 ---------- */
:root {
  --color-primary:    #c41a1a;   /* 主红 */
  --color-primary-d:  #8b0000;   /* 深红 */
  --color-primary-l:  #e74c3c;   /* 亮红 */
  --color-gold:       #f5c842;   /* 金色 */
  --color-gold-light: #ffe066;   /* 浅金 */
  --color-cream:      #fff8e7;   /* 暖白 */
  --color-dark:       #1a0a0a;
  --color-text:       #fff8e7;

  --font-display: 'STZhongsong', 'SimSun', 'Noto Serif SC', 'Source Han Serif CN', serif;
  --font-body:    'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', system-ui, sans-serif;

  --spacing-xs: 4px;
  --spacing-s:  8px;
  --spacing-m:  16px;
  --spacing-l:  24px;
  --spacing-xl: 40px;

  --radius-card: 12px;
  --radius-badge: 50%;

  --shadow-gold:   0 0 20px rgba(245, 200, 66, 0.4);
  --shadow-card:   0 8px 24px rgba(0,0,0,0.35);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  min-height: 100vh;
  background:
    radial-gradient(ellipse at top, #a01020 0%, var(--color-primary) 40%, var(--color-primary-d) 100%);
  overflow-x: hidden;
  line-height: 1.6;
}

/* 装饰性纹理叠加（噪点+放射光） */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 50% 30%, rgba(245,200,66,0.08) 0%, transparent 60%),
    repeating-linear-gradient(
      45deg,
      rgba(0,0,0,0.03) 0px, rgba(0,0,0,0.03) 1px,
      transparent 1px, transparent 8px
    );
}

/* 内容区层叠 */
header, main, footer { position: relative; z-index: 1; }

/* ---------- Header ---------- */
.poster-header {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-l) var(--spacing-l);
}

.header-decor {
  display: flex;
  justify-content: center;
  gap: var(--spacing-m);
  margin: var(--spacing-m) 0;
}

.header-decor .star {
  color: var(--color-gold);
  font-size: 1.2rem;
  text-shadow: 0 0 8px rgba(245,200,66,0.8);
  animation: twinkle 2.4s ease-in-out infinite;
}
.header-decor .star:nth-child(2) { animation-delay: 0.2s; }
.header-decor .star:nth-child(3) { animation-delay: 0.4s; }
.header-decor .star:nth-child(4) { animation-delay: 0.6s; }
.header-decor .star:nth-child(5) { animation-delay: 0.8s; }

@keyframes twinkle {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50%      { opacity: 1;   transform: scale(1.3); }
}

/* 八一徽章 */
.bayi-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 96px;
  height: 96px;
  border-radius: var(--radius-badge);
  background:
    radial-gradient(circle at 50% 40%, #ffe066, var(--color-gold) 55%, #b8860b 100%);
  box-shadow:
    0 0 0 4px var(--color-primary-d),
    0 0 0 6px var(--color-gold),
    var(--shadow-gold);
  margin-bottom: var(--spacing-l);
}

.bayi-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-primary-d);
  line-height: 1.1;
}

.bayi-sub {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary-d);
  letter-spacing: 2px;
}

/* 主标题 */
.main-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 9vw, 5.5rem);
  font-weight: 900;
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.2em;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-s);
}

.title-line {
  background: linear-gradient(180deg, var(--color-gold-light) 0%, var(--color-gold) 45%, #d4a017 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 6px rgba(245,200,66,0.5));
}

.title-num {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 12vw, 7rem);
  font-weight: 900;
  background: linear-gradient(180deg, #fff 0%, var(--color-gold-light) 35%, var(--color-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 3px 10px rgba(245,200,66,0.7));
}

.sub-title {
  font-size: clamp(1rem, 3vw, 1.4rem);
  color: var(--color-cream);
  letter-spacing: 6px;
  opacity: 0.92;
}

/* ---------- 装备区 ---------- */
.equipment-section {
  padding: var(--spacing-l) var(--spacing-l) 0;
}

.section-heading {
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 8px;
  margin-bottom: var(--spacing-l);
  text-shadow: 0 0 12px rgba(245,200,66,0.4);
}

.equipment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-m);
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-s);
}

.equip-card {
  background: rgba(0,0,0,0.35);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid rgba(245,200,66,0.25);
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.equip-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 32px rgba(0,0,0,0.5), 0 0 20px rgba(245,200,66,0.2);
}

.equip-card img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: 1px solid rgba(245,200,66,0.2);
}

.equip-card figcaption {
  text-align: center;
  padding: var(--spacing-s) var(--spacing-m);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gold-light);
  letter-spacing: 2px;
}

/* ---------- 口号区 ---------- */
.slogan-section {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-l) var(--spacing-xl);
  max-width: 800px;
  margin: 0 auto;
}

.slogan-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--spacing-m) 0;
  color: var(--color-gold);
  font-size: 1rem;
}
.slogan-divider::before,
.slogan-divider::after {
  content: '';
  display: block;
  flex: 1;
  max-width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}
.slogan-divider:not(:empty)::before { margin-right: var(--spacing-m); }
.slogan-divider:not(:empty)::after  { margin-left:  var(--spacing-m); }

.slogan {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.8;
  letter-spacing: 6px;
  background: linear-gradient(180deg, #fff 0%, var(--color-gold-light) 50%, var(--color-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 8px rgba(245,200,66,0.4));
  margin: var(--spacing-s) 0;
}

/* ---------- Footer ---------- */
.poster-footer {
  text-align: center;
  padding: var(--spacing-l) var(--spacing-m) var(--spacing-xl);
  font-size: 0.85rem;
  color: rgba(255,248,231,0.55);
  letter-spacing: 2px;
}

/* ==========================================
   响应式断点
   ========================================== */

/* 宽屏（≥ 768px）：两列装备图 */
@media (min-width: 768px) {
  .poster-header { padding-top: 56px; }
  .equipment-grid { grid-template-columns: repeat(4, 1fr); }
}

/* 平板（480–767px）：两列 */
@media (min-width: 480px) and (max-width: 767px) {
  .equipment-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 窄手机（< 480px）：单列堆叠，字号收紧 */
@media (max-width: 479px) {
  :root {
    --spacing-xl: 24px;
    --spacing-l: 16px;
  }
  .equipment-grid { grid-template-columns: 1fr; }
  .main-title { gap: 0.1em; }
  .slogan { letter-spacing: 3px; }
  .sub-title { letter-spacing: 3px; font-size: 0.95rem; }
}

/* 超宽屏居中限宽 */
@media (min-width: 1200px) {
  .poster-header, .equipment-section, .slogan-section {
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .header-decor .star { animation: none; }
  .equip-card { transition: none; }
}

/* 高对比模式增强边框 */
@media (forced-colors: active) {
  .equip-card { border: 2px solid CanvasText; }
  .bayi-badge { border: 3px solid CanvasText; }
}