/* ============================================================
   浙大城市学院 MC 协会官网 - 像素风格
   ============================================================ */

:root {
  --mc-grass: #6ab04c;
  --mc-grass-dark: #4e8b34;
  --mc-dirt: #7a4f2a;
  --mc-dirt-dark: #5b3a1d;
  --mc-stone: #8a8a8a;
  --mc-sky: #87ceeb;
  --mc-sky-deep: #4ea4d8;
  --mc-night: #1a1f2b;
  --mc-paper: #f4ecd8;
  --mc-text: #2c2620;
  --mc-accent: #f9c74f;
  --mc-red: #c0392b;
  --shadow-pixel: 4px 4px 0 rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.18);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--mc-paper);
  color: var(--mc-text);
  line-height: 1.7;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
  image-rendering: pixelated;
}

a {
  color: var(--mc-grass-dark);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover {
  color: var(--mc-accent);
}

/* ===== 像素方块按钮 ===== */
.pixel-btn {
  display: inline-block;
  font-family: inherit;
  font-size: 16px;
  padding: 12px 24px;
  background: var(--mc-grass);
  color: #fff;
  border: 3px solid var(--mc-night);
  box-shadow: var(--shadow-pixel);
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s, background 0.1s;
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.4);
  user-select: none;
}
.pixel-btn:hover {
  background: var(--mc-grass-dark);
  color: #fff;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.4);
}
.pixel-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 rgba(0, 0, 0, 0.4);
}
.pixel-btn.alt {
  background: var(--mc-dirt);
}
.pixel-btn.alt:hover {
  background: var(--mc-dirt-dark);
}

/* ===== 像素卡片 ===== */
.pixel-card {
  background: #fff;
  border: 4px solid var(--mc-night);
  box-shadow: var(--shadow-pixel);
  padding: 24px;
}

/* ===== 导航 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(26, 31, 43, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 4px solid var(--mc-grass);
  padding: 12px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.3s;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-size: 18px;
}
.nav__brand img {
  width: 44px;
  height: 44px;
}
.nav__menu {
  display: flex;
  gap: 8px;
  list-style: none;
}
.nav__menu a {
  display: block;
  padding: 8px 16px;
  color: #fff;
  font-size: 15px;
  border: 2px solid transparent;
  transition: all 0.15s;
}
.nav__menu a:hover {
  background: var(--mc-grass);
  border-color: var(--mc-night);
  color: #fff;
}
.nav__toggle {
  display: none;
  background: none;
  border: 2px solid #fff;
  color: #fff;
  width: 40px;
  height: 40px;
  cursor: pointer;
  font-size: 18px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0.55)),
    url("../images/bg-hero1.png") center/cover no-repeat;
  text-align: center;
  color: #fff;
  padding: 120px 24px 80px;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 3px, rgba(255, 255, 255, 0.02) 3px 4px);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 900px;
}
.hero__logo {
  width: 200px;
  height: 200px;
  margin: 0 auto 24px;
  filter: drop-shadow(4px 4px 0 rgba(0, 0, 0, 0.6));
  animation: float 4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero__title {
  font-size: clamp(32px, 6vw, 64px);
  margin-bottom: 16px;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.7);
  letter-spacing: 0.05em;
}
.hero__subtitle {
  font-size: clamp(16px, 2.4vw, 22px);
  margin-bottom: 32px;
  opacity: 0.95;
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.6);
}
.hero__tagline {
  display: inline-block;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid #fff;
  padding: 8px 20px;
  margin-bottom: 32px;
  font-size: 14px;
  letter-spacing: 0.2em;
}
.hero__cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero__scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  font-size: 14px;
  z-index: 2;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 10px); }
}

/* ===== 通用 Section ===== */
.section {
  padding: 100px 24px;
  position: relative;
}
.section__container {
  max-width: 1200px;
  margin: 0 auto;
}
.section__title {
  font-size: clamp(28px, 4vw, 42px);
  text-align: center;
  margin-bottom: 16px;
  color: var(--mc-text);
  position: relative;
  display: inline-block;
  width: 100%;
}
.section__title::before {
  content: "[";
  color: var(--mc-grass);
  margin-right: 12px;
}
.section__title::after {
  content: "]";
  color: var(--mc-grass);
  margin-left: 12px;
}
.section__subtitle {
  text-align: center;
  font-size: 14px;
  color: var(--mc-stone);
  letter-spacing: 0.3em;
  margin-bottom: 48px;
  text-transform: uppercase;
}

/* ===== 草地分隔 ===== */
.grass-divider {
  height: 60px;
  background:
    linear-gradient(to bottom,
      var(--mc-grass) 0%, var(--mc-grass) 30%,
      var(--mc-grass-dark) 30%, var(--mc-grass-dark) 40%,
      var(--mc-dirt) 40%, var(--mc-dirt) 75%,
      var(--mc-dirt-dark) 75%, var(--mc-dirt-dark) 100%);
  background-size: 100% 100%;
  position: relative;
}
.grass-divider::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg,
      transparent 0 32px,
      rgba(0, 0, 0, 0.08) 32px 33px);
}

/* ===== 关于我们 ===== */
.about {
  background: var(--mc-paper);
}
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.about__text p {
  margin-bottom: 16px;
  font-size: 16px;
}
.about__text p:first-of-type::first-letter {
  font-size: 1.8em;
  color: var(--mc-grass-dark);
  font-weight: bold;
}
.about__visual {
  background: var(--mc-night);
  border: 4px solid var(--mc-grass);
  box-shadow: var(--shadow-pixel);
  padding: 32px;
  color: #fff;
  text-align: center;
}
.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.stat__num {
  font-size: 32px;
  color: var(--mc-accent);
  display: block;
}
.stat__label {
  font-size: 12px;
  color: #ccc;
  letter-spacing: 0.2em;
}

/* ===== Minecraft 介绍 ===== */
.mc-intro {
  background:
    linear-gradient(rgba(20, 30, 50, 0.85), rgba(20, 30, 50, 0.92)),
    url("../images/bg-hero2.png") center/cover fixed no-repeat;
  color: #fff;
}
.mc-intro .section__title { color: #fff; }
.mc-intro .section__subtitle { color: #aac; }
.mc-intro__content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  font-size: 17px;
}
.mc-intro__content p { margin-bottom: 20px; }

/* ===== 项目展示 ===== */
.projects {
  background: #ece5d0;
}
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.project-card {
  background: #fff;
  border: 4px solid var(--mc-night);
  box-shadow: var(--shadow-pixel);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.4);
}
.project-card__image {
  height: 200px;
  background: var(--mc-grass);
  position: relative;
  overflow: hidden;
}
.project-card__image::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: 32px 32px;
  background-image:
    linear-gradient(45deg, rgba(0,0,0,0.15) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0,0,0,0.15) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0,0,0,0.15) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0,0,0,0.15) 75%);
  background-position: 0 0, 0 16px, 16px -16px, -16px 0;
}
.project-card__image[data-color="dirt"] { background: var(--mc-dirt); }
.project-card__image[data-color="stone"] { background: var(--mc-stone); }
.project-card__image[data-color="sky"] { background: var(--mc-sky-deep); }
.project-card__image[data-color="redstone"] { background: var(--mc-red); }
.project-card__icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  color: #fff;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.5);
  z-index: 2;
}
.project-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.project-card__title {
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--mc-text);
}
.project-card__desc {
  font-size: 14px;
  color: #555;
  flex: 1;
  margin-bottom: 16px;
}
.project-card__more {
  align-self: flex-start;
  font-size: 13px;
  color: var(--mc-grass-dark);
  border-bottom: 2px dashed var(--mc-grass);
  padding-bottom: 2px;
}

/* ===== 加入我们 ===== */
.join {
  background: var(--mc-paper);
}
.join__intro {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}
.join__intro strong {
  display: inline-block;
  background: var(--mc-accent);
  padding: 4px 16px;
  border: 3px solid var(--mc-night);
  margin-top: 12px;
}
.join__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}
.join-card {
  background: #fff;
  border: 4px solid var(--mc-night);
  box-shadow: var(--shadow-pixel);
  padding: 36px;
  text-align: center;
}
.join-card h3 {
  font-size: 26px;
  margin-bottom: 12px;
  color: var(--mc-grass-dark);
}
.join-card .badge {
  display: inline-block;
  font-size: 12px;
  background: var(--mc-grass);
  color: #fff;
  padding: 2px 10px;
  margin-bottom: 16px;
  letter-spacing: 0.2em;
}
.join-card p {
  font-size: 15px;
  margin-bottom: 24px;
  color: #555;
}
.join__contacts {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.contact-chip {
  background: #fff;
  border: 3px solid var(--mc-night);
  padding: 10px 20px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.contact-chip strong { color: var(--mc-grass-dark); }

/* ===== 倒计时 ===== */
.countdown {
  background:
    linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.85)),
    url("../images/bg-hero2.png") center/cover no-repeat;
  color: #fff;
  text-align: center;
}
.countdown__title {
  font-size: clamp(24px, 4vw, 38px);
  margin-bottom: 32px;
}
.countdown__title::before { content: "// "; color: var(--mc-grass); }
.countdown__title::after { content: " //"; color: var(--mc-grass); }
.countdown__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 700px;
  margin: 0 auto 32px;
}
.cd-cell {
  background: rgba(255, 255, 255, 0.06);
  border: 3px solid var(--mc-grass);
  padding: 24px 8px;
}
.cd-cell__num {
  font-size: clamp(36px, 6vw, 56px);
  color: var(--mc-accent);
  display: block;
  line-height: 1;
}
.cd-cell__label {
  font-size: 13px;
  color: #ccc;
  letter-spacing: 0.2em;
  margin-top: 12px;
  display: block;
}
.countdown__note { font-size: 14px; color: #ddd; }

/* ===== 页脚 ===== */
.footer {
  background: var(--mc-night);
  color: #ddd;
  padding: 64px 24px 24px;
}
.footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer__brand img {
  width: 80px;
  margin-bottom: 16px;
}
.footer__brand h4 {
  color: #fff;
  font-size: 18px;
  margin-bottom: 8px;
}
.footer__brand p {
  font-size: 13px;
  color: #999;
  line-height: 1.8;
}
.footer h5 {
  color: var(--mc-grass);
  font-size: 14px;
  letter-spacing: 0.2em;
  margin-bottom: 16px;
  border-bottom: 2px solid #333;
  padding-bottom: 8px;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; font-size: 14px; }
.footer a { color: #bbb; }
.footer a:hover { color: var(--mc-accent); }
.footer__bottom {
  max-width: 1200px;
  margin: 48px auto 0;
  padding-top: 24px;
  border-top: 2px solid #333;
  text-align: center;
  font-size: 12px;
  color: #777;
}

/* ===== 滚动入场动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .nav { padding: 10px 16px; }
  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--mc-night);
    flex-direction: column;
    padding: 16px;
    display: none;
    border-bottom: 4px solid var(--mc-grass);
  }
  .nav__menu.open { display: flex; }
  .nav__toggle { display: block; }

  .about__grid,
  .join__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .countdown__grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 70px 20px; }
}
@media (max-width: 480px) {
  .footer__inner { grid-template-columns: 1fr; }
  .hero__logo { width: 140px; height: 140px; }
}

/* ===== 选中样式 ===== */
::selection {
  background: var(--mc-grass);
  color: #fff;
}