/* 導入字型：Fredoka (圓潤英文標題) + Noto Sans TC (親切繁中內文) */
@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@300..700&family=Noto+Sans+TC:wght@300..700&display=swap');

:root {
  --bg-color: #faf8f5;        /* 溫暖紙張乳白色 */
  --card-bg: #ffffff;         /* 卡片純白色 */
  --text-dark: #2f3e46;       /* 深炭灰 (取代刺眼純黑) */
  --text-muted: #5c675c;      /* 溫和的灰綠 */
  --border-color: #353b3c;    /* 手繪框線的深灰色 */
  
  --primary-coral: #e07a5f;   /* 暖磚紅 (效度分析系統代表色) */
  --primary-coral-dark: #c9654b;
  --primary-sage: #81b29a;    /* 鼠尾草綠 (教學資源系統代表色) */
  --primary-sage-dark: #689c83;
  --primary-yellow: #f4f1de;  /* 暖鵝黃 (點綴色) */
  --primary-indigo: #3d5a80;  /* 深靛藍 (頁首圖示/副標點綴色) */
  --shadow-color: #353b3c;
}

/* 基礎設定 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  /* 點狀紙張紋理效果 */
  background-image: radial-gradient(#e6ded6 2px, transparent 2px);
  background-size: 28px 28px;
  font-family: 'Noto Sans TC', 'Fredoka', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-dark);
  min-height: 100vh;
  padding: 2.5rem 1.5rem;
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

/* 筆記本邊緣裝飾線：模擬活頁夾與紅藍邊線 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 60px;
  width: 2px;
  height: 100%;
  background-color: rgba(224, 122, 95, 0.35); /* 經典粉紅筆記本分隔線 */
  z-index: -2;
}

.notebook-spine {
  position: fixed;
  top: 0;
  left: 20px;
  width: 25px;
  height: 100%;
  background-image: radial-gradient(circle, #faf8f5 6px, #353b3c 7px, #353b3c 8px, transparent 9px);
  background-size: 25px 50px;
  background-position: center;
  opacity: 0.15;
  z-index: -1;
  pointer-events: none;
}

/* 主容器 */
.app-container {
  max-width: 1100px;
  margin: 0 auto;
  padding-left: 20px; /* 避開左側筆記裝飾線 */
}

/* ==================== 頁首 Header ==================== */
.main-header {
  background-color: var(--card-bg);
  border: 3px solid var(--border-color);
  /* 不規則的手繪邊框造型 */
  border-radius: 20px 45px 20px 40px / 40px 20px 45px 20px;
  box-shadow: 6px 6px 0px var(--shadow-color);
  padding: 2.5rem 2rem;
  margin-bottom: 3rem;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.header-logo {
  background-color: var(--primary-indigo);
  color: #ffffff;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 3px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 1rem;
  box-shadow: 3px 3px 0px var(--shadow-color);
}

.main-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.2rem;
  letter-spacing: 1px;
}

.subtitle {
  font-family: 'Fredoka', 'Noto Sans TC', sans-serif;
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.header-decor {
  display: flex;
  gap: 12px;
  margin-top: 1.2rem;
}

.decor-tag {
  font-size: 0.85rem;
  font-weight: 700;
  padding: 4px 14px;
  border: 2px solid var(--border-color);
  border-radius: 20px 8px 20px 8px / 8px 20px 8px 20px;
  box-shadow: 2px 2px 0px var(--shadow-color);
}

.tag-orange { background-color: #ffdab9; }
.tag-green { background-color: #c7f9cc; }
.tag-yellow { background-color: var(--primary-yellow); }

/* ==================== 主視覺區 Hero Section ==================== */
.hero-section {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.4);
  border: 3px dashed var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  margin-bottom: 3.5rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.hero-greeting {
  font-size: 1.8rem;
  font-weight: 700;
}

.highlight {
  background: linear-gradient(120deg, rgba(244, 241, 222, 0.8) 0%, rgba(244, 241, 222, 0.99) 100%);
  padding: 2px 8px;
  border-bottom: 3px dashed var(--primary-coral);
  border-radius: 4px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-dark);
  text-align: justify;
}

.hero-tip {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: 12px 18px 12px 18px / 18px 12px 18px 12px;
  padding: 1rem;
  box-shadow: 3px 3px 0px var(--shadow-color);
}

.tip-icon {
  color: #e9c46a;
  font-size: 1.4rem;
  animation: bulbGlow 2s ease-in-out infinite alternate;
}

@keyframes bulbGlow {
  0% { transform: scale(1); filter: drop-shadow(0 0 1px rgba(233, 196, 106, 0.2)); }
  100% { transform: scale(1.1); filter: drop-shadow(0 0 8px rgba(233, 196, 106, 0.8)); }
}

.hero-image-wrapper {
  background-color: var(--card-bg);
  border: 3px solid var(--border-color);
  /* 照片黏貼效果：微旋轉與手繪框 */
  border-radius: 15px 35px 20px 30px / 30px 20px 35px 15px;
  padding: 12px;
  box-shadow: 8px 8px 0px var(--shadow-color);
  transform: rotate(-1.5deg);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.hero-image-wrapper:hover {
  transform: rotate(1.5deg) scale(1.03);
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  /* 鉛筆素描邊緣感 */
  border: 1px solid rgba(0, 0, 0, 0.1);
}

/* ==================== 工具卡片區 Tools Section ==================== */
.tools-section {
  margin-bottom: 4rem;
}

.section-title-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-underline {
  width: 180px;
  height: 6px;
  background-color: var(--primary-yellow);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  margin-top: 8px;
  position: relative;
}

.title-underline::after {
  content: '';
  position: absolute;
  top: -2px;
  left: 30px;
  width: 25px;
  height: 6px;
  background-color: var(--primary-coral);
  border-radius: 10px;
}

.cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.tool-card {
  background-color: var(--card-bg);
  border: 3px solid var(--border-color);
  border-radius: 20px 24px 18px 22px / 24px 18px 22px 20px;
  box-shadow: 6px 6px 0px var(--shadow-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
  overflow: hidden;
}

.tool-card:hover {
  transform: translate(-8px, -8px);
  box-shadow: 14px 14px 0px var(--shadow-color);
}

.card-image-container {
  background-color: var(--primary-yellow);
  border-bottom: 3px solid var(--border-color);
  padding: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 220px;
  overflow: hidden;
}

.validity-card .card-image-container {
  background-color: #fceade; /* 柔和粉橘背景 */
}

.resources-card .card-image-container {
  background-color: #ebf5ee; /* 柔和粉綠背景 */
}

.card-image {
  max-width: 90%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.tool-card:hover .card-image {
  transform: scale(1.08) rotate(1deg);
}

.card-body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 1.2rem;
}

.card-badge {
  align-self: flex-start;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 6px;
  border: 2px solid var(--border-color);
  box-shadow: 1px 1px 0px var(--shadow-color);
}

.badge-coral { background-color: #ffcbd1; color: #b73a3a; }
.badge-sage { background-color: #d8f3dc; color: #2d6a4f; }

.card-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-dark);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-dark);
  text-align: justify;
  flex-grow: 1;
}

.card-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.feature-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-color);
  border: 1px dashed var(--border-color);
  padding: 4px 10px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* ==================== 物理擬真按鈕 Button Styles ==================== */
.card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border: 3px solid var(--border-color);
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 4px 4px 0px var(--shadow-color);
  transition: all 0.15s ease;
}

.btn-coral {
  background-color: var(--primary-coral);
  color: #ffffff;
  /* 手繪不對稱圓角 */
  border-radius: 35px 12px 30px 15px / 15px 30px 12px 35px;
}

.btn-coral:hover {
  background-color: var(--primary-coral-dark);
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0px var(--shadow-color);
}

.btn-coral:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0px var(--shadow-color);
}

.btn-sage {
  background-color: var(--primary-sage);
  color: #ffffff;
  /* 手繪不對稱圓角 */
  border-radius: 15px 30px 12px 35px / 35px 12px 30px 15px;
}

.btn-sage:hover {
  background-color: var(--primary-sage-dark);
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0px var(--shadow-color);
}

.btn-sage:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0px var(--shadow-color);
}

/* ==================== 頁尾 Footer ==================== */
.main-footer {
  text-align: center;
  padding: 3rem 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-divider {
  width: 100%;
  height: 3px;
  background-image: linear-gradient(to right, transparent, var(--border-color) 15%, var(--border-color) 85%, transparent);
  margin-bottom: 1.5rem;
}

.footer-text {
  font-size: 0.95rem;
  font-weight: 600;
}

.footer-subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==================== 響應式排版 Media Queries ==================== */
@media (max-width: 900px) {
  body {
    padding: 1.5rem 1rem;
  }
  
  body::before {
    left: 20px;
  }
  
  .notebook-spine {
    display: none;
  }
  
  .app-container {
    padding-left: 10px;
  }
  
  .hero-section {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 1.8rem;
  }
  
  .hero-image-wrapper {
    max-width: 320px;
    margin: 0 auto;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 600px) {
  .main-header {
    padding: 1.8rem 1rem;
  }
  
  .main-title {
    font-size: 1.6rem;
  }
  
  .subtitle {
    font-size: 0.9rem;
  }
  
  .hero-greeting {
    font-size: 1.4rem;
  }
  
  .card-body {
    padding: 1.5rem;
  }
  
  .card-title {
    font-size: 1.25rem;
  }
}