/* ------------------------------------
   主色調設定
------------------------------------ */
:root {
  --primary-green: #6bbf59;
  --deep-green: #395b37;
  --light-green-bg: #f1f5e9;
  --border-green: #d4e3c3;
  --dark-text: #2c3e2c;
  --accent-yellow: #ffd54f;

  --section-light: #f7f9f4;
  --section-lighter: #fafcf7;
  --section-dark: #222;
}

/* ------------------------------------
   全站基本設定
------------------------------------ */

html, body {
  background: #111 !important;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", sans-serif;
  background: #f8faff;
  color: var(--dark-text);
  line-height: 1.7;
}

h1,
h2,
h3 {
  font-weight: 700;
  margin: 0;
}

/* =======================================================================
   HERO 區
======================================================================= */

.hero {
  position: relative;
  height: 80vh;
  background-image: url("https://yingan1998.github.io/low-carbon-game/pic/bg2.png");
  background-size: cover;
  background-position: center;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
}

.hero-content {
  position: relative;
  z-index: 5;
  color: white;
  padding: 20px;
}

.hero-content h1 {
  font-size: 52px;
  font-weight: 900;
  margin-bottom: 18px;
}

.hero-content p {
  font-size: 22px;
  opacity: 0.95;
}

.hero-btn {
  display: inline-block;
  margin-top: 24px;
  padding: 14px 36px;
  background: white;
  color: #333;
  border-radius: 40px;
  font-weight: 700;
  text-decoration: none;
  transition: 0.25s;
}

.hero-btn:hover {
  background: #e7e7e7;
  transform: translateY(-3px);
}

/* =======================================================================
   Section 通用設定
======================================================================= */
.section {
  padding: 80px 20px;
}

.section-title {
  font-size: 48px;
  text-align: center;
  margin-bottom: 35px;
}

/* =======================================================================
   活動介紹
======================================================================= */

.intro-section-v2 {
  background: #f7f9f4;
  padding: 90px 20px;
}

.intro-container {
  max-width: 1200px;
  margin: auto;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* 左側文字 */
.intro-text {
  font-size: 20px;
  color: #2d2d2d;
  line-height: 1.85;
}

.intro-title {
  font-size: 50px;
  font-weight: 900;
  margin-bottom: 30px;
  color: #2c3e2c;
}

.intro-subtitle {
  font-size: 24px;
  font-weight: 700;
  margin-top: 24px;
  margin-bottom: 8px;
  color: #395b37;
}

.intro-text ul {
  margin-left: 20px;
  margin-bottom: 12px;
}

.intro-text li {
  margin-bottom: 6px;
  font-size: 19px;
}

/* 右側圖片 */
.intro-image-box img {
  width: 100%;
  border-radius: 18px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
  object-fit: cover;
}

/* 手機版 RWD */
@media (max-width: 900px) {
  .intro-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .intro-title {
    font-size: 36px;
  }

  .intro-image-box img {
    width: 90%;
    margin: 20px auto 0 auto;
  }
}

/* =======================================================================
   遊戲介紹
======================================================================= */

.game-section {
  background: #2c3e2c;
  color: white;
  text-align: center;
  padding: 80px 20px;
}

.section-title.light {
  color: white;
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 40px;
}

.carousel-card {
  max-width: 680px;
  margin: auto;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(4px);
  padding: 32px;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25); 
}


.carousel-card img {
  width: 100%;
  border-radius: 14px;
  margin-bottom: 15px;
}

.carousel-card h3 {
  font-size: 26px;
  font-weight: 700;
  margin-top: 10px;
  margin-bottom: 8px;
}


.carousel-card p {
  opacity: 0.95;   
  font-size: 18px;
  line-height: 1.6;
}

/* =======================================================================
   活動三步驟+福利
======================================================================= */

.step-flow-section {
  background: #f1f5e9 !important;  
  padding: 80px 20px;
}
.step-flow-section .section-title {
  color: #2c3e2c !important; 
}


/* 外層左右排列 */
.step-reward-wrapper {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 20px;
  flex-wrap: wrap;
}

/* 左側（步驟） */
.step-column {
  flex: 1 1 500px;
  max-width: 600px;
}

/* 按鈕 */
.step-btn {
  display: inline-block; 
  padding: 10px 26px;
  background: #3c5237;
  color: #fff;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  margin-top: 15px;
}


/* 流程圖樣式 */
.flow-item {
  background: #fff;
  padding: 25px;
  border-radius: 18px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  margin: 0 auto 30px auto;
  text-align: center;
  max-width: 650px;
  width: 100%;
}

.flow-item img {
  width: 260px;
  border-radius: 12px;
  margin-bottom: 28px; 
}

/* 大箭頭 */
.big-arrow {
  text-align: center;
  font-size: 70px;
  color: #080808;
  font-weight: 900;
  line-height: 1;
  margin: 10px 0 25px 0;
}

.flow-item h3 {
  margin-top: 0;
  margin-bottom: 10px;   
}

.flow-item p {
  margin-top: 0;
  margin-bottom: 20px;  
}


/* =============================== */
/* 福利卡片  */
/* =============================== */

.reward-section {
  background: #333f36; 
  padding: 80px 20px;
}

.reward-section .section-title {
  color: #ffffff;
}

/* 卡片外層 */
.reward-card-group {
  max-width: 900px; 
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}


/* 每張福利卡片 */
.reward-card {
  background: rgba(254, 254, 254, 0.786); 
  padding: 22px 26px;
  border-radius: 18px;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: 0.25s ease;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.45);
}

.reward-card:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
  box-shadow: 0 14px 26px rgba(0, 0, 0, 0.55);
}

.reward-icon {
  font-size: 34px;
  width: 40px;
}


/* 標題文字 */
.reward-text h4 {
  color: #000000; 
  font-weight: 700;
}

.reward-text p {
  color: #646464;
}



/* RWD：手機 */
@media (max-width: 768px) {

 
  .section {
    padding: 50px 20px !important;
  }

  /* 主標題（活動介紹） */
  .section h2 {
    font-size: 32px !important;
    line-height: 1.25;
    margin-bottom: 20px !important;
  }

  /* 介紹文字段落 */
  .section p {
    font-size: 17px !important;
    line-height: 1.7 !important;
    margin-bottom: 18px !important;
    padding: 0 4px;
    text-align: left !important;
  }

  /* 子標題（本活動包含 / 孩子將學到） */
  .section .intro-subtitle,
  .section h3 {
    font-size: 22px !important;
    margin-top: 28px !important;
    margin-bottom: 12px !important;
  }

  /* 列表 */
  .section ul {
    margin-left: 20px !important;
  }

  .section li {
    font-size: 17px !important;
    margin-bottom: 10px !important;
    line-height: 1.65 !important;
  }

  .flow-item img {
    width: 160px;
  }

  .reward-card {
    padding: 18px;
  }

  .reward-icon {
    font-size: 30px;
  }

  .hero-content h1 {
    font-size: 34px;       
    line-height: 1.25;     
    font-weight: 900;
    word-break: break-word;
  }

  .hero-content p {
    font-size: 18px;       
    margin-top: 10px;
    line-height: 1.6;
  }

  .hero-btn {
    margin-top: 28px;
    padding: 12px 28px;
    font-size: 18px;
  }

  .intro-section-v2 {
    padding: 50px 22px;   
  }

  .intro-title,
  .section-title {
    font-size: 32px;
    margin-bottom: 18px;
    line-height: 1.2;
  }

  .intro-text {
    font-size: 17px;
    line-height: 1.65;
    text-align: left;
  }

  .intro-subtitle {
    font-size: 20px;
    margin-top: 26px;
    margin-bottom: 10px;
  }

  .intro-text ul {
    margin-left: 16px;
  }

  .intro-text li {
    font-size: 17px;
    margin-bottom: 10px;
  }
}


/* =======================================================================
   頁尾
======================================================================= */

.footer {
  background: #111;
  color: #ffffff;
  text-align: center;
  padding: 26px 0;
  font-size: 15px;
  margin-top: 40px;
}

/* =======================================================================
   彈跳視窗
======================================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: none;
  z-index: 9999;
  padding: 40px 20px;
  overflow-y: auto;
  backdrop-filter: blur(4px);
  align-items: flex-start;
  justify-content: center;
}

#introModal .modal-content {
  width: 100%;
  max-width: 650px;
  background: transparent;
  border-radius: 22px;
  overflow: visible;
  position: relative;
}

/* 關閉按鈕 */
#introModal .modal-close {
  position: absolute;
  top: 16px;
  right: 20px;
  background: #ffffffcc;
  border: none;
  font-size: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 1000;
}

.close-btn {
  background: #ccc;
  color: #333;
}

/* ================================
   海報背景
================================ */

#introModal .poster-v3 {
  width: 100%;
  border-radius: 20px;
  overflow: hidden;
  position: relative;
}

#introModal .poster-bg-v3 {
  background-image: url("https://yingan1998.github.io/low-carbon-game/pic/poster-bg.png");
  background-size: cover;
  background-position: center;
  width: 100%;
  padding-top: 60%;
  filter: brightness(0.75);
  position: relative;
}

#introModal .poster-mask-v3 {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(20, 40, 25, 0.2),
    rgba(20, 40, 25, 0.55),
    rgba(20, 40, 25, 0.8)
  );
}

/* ================================
   文字 + 內容卡片
================================ */

#introModal .poster-inner {
  position: relative;
  padding: 0 28px 40px 28px;
  margin-top: -90px;
  z-index: 10;
}

#introModal .poster-h2 {
  font-size: 38px;
  text-align: center;
  margin-bottom: 18px;
  color: #fff;
  text-shadow: 2px 3px 6px rgba(0, 0, 0, 0.45);
}

#introModal .poster-panel {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(4px);
  padding: 28px 30px;
  border-radius: 22px;
  margin-top: 10px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

#introModal .poster-panel .poster-text-v3 {
  color: #3a3a35;
  font-size: 18px;
  line-height: 1.85;
}

#introModal .poster-btn-v3 {
  display: block;
  width: 70%;
  margin: 36px auto 0 auto;
  padding: 14px 0;
  background: #ffffffee;
  color: #222;
  font-size: 20px;
  font-weight: 700;
  border-radius: 40px;
  text-align: center;
  text-decoration: none;
  transition: 0.25s;
}

#introModal .poster-btn-v3:hover {
  background: #fff;
  transform: translateY(-3px);
}

/* =======================================================================
   動畫
======================================================================= */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}