:root {
  --blue: #287EE5;
  --blue-dark: #1C5BB0;
  --blue-light: #A7D8FF;
  --yellow: #FFDF3F;
  --bg: #f5f5f7;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Nunito", system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: #222;
}

/* 通用 layout */

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 16px;
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: #fffceb;
}

.section-title {
  text-align: center;
  font-size: clamp(26px, 3vw, 32px);
  margin: 0 0 32px;
  color: var(--blue-dark);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--blue);
  color: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
}

.logo {
  font-weight: 800;
  letter-spacing: 0.03em;
  font-size: 24px;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.nav a {
  color: #fff;
  text-decoration: none;
  opacity: 0.9;
}

.nav a:hover {
  opacity: 1;
}

/* Hero */

.hero {
  background: var(--yellow);
  padding: 64px 0 72px;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.hero-text {
  flex: 1 1 260px;
}

.hero-text h1 {
  font-size: clamp(32px, 4vw, 40px);
  margin: 0 0 16px;
  color: #0052b0;
}

.hero-text p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.5;
}

.hero-ctas {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.14);
}

.btn-primary[aria-disabled="true"] {
  opacity: 0.85;
}

.small-note {
  font-size: 12px;
  color: #555;
}

.hero-phone {
  flex: 0 0 260px;
  display: flex;
  justify-content: center;
}

.phone-frame {
  background: #111;
  border-radius: 32px;
  padding: 10px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.25);
  max-width: 260px;
}

.phone-frame img {
  display: block;
  width: 100%;
  border-radius: 24px;
}

/* Features */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.feature-card {
  background: #fff;
  border-radius: 20px;
  padding: 16px 18px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.06);
  border: 2px solid var(--blue-light);
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--blue-dark);
  font-size: 18px;
}

.feature-card p {
  margin: 0;
  font-size: 14px;
}

/* Modes */

.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.mode-card {
  background: #fff;
  border-radius: 24px;
  padding: 20px 22px;
  border: 2px solid var(--blue);
  box-shadow: 0 10px 24px rgba(0,0,0,0.08);
}

.mode-card h3 {
  margin: 0 0 8px;
  color: var(--blue-dark);
}

.mode-card p {
  margin: 0;
  font-size: 14px;
}

/* Parents */

.parents-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.parent-card {
  background: #fff;
  border-radius: 18px;
  padding: 16px 18px;
  border-left: 6px solid var(--blue);
}

.parent-card h3 {
  margin: 0 0 8px;
  color: var(--blue-dark);
}

.parent-card p {
  margin: 0;
  font-size: 14px;
}

/* Screenshots */

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

/* 新截圖版型：每張圖都有自己的容器與手機框 */
.screenshot-item {
  display: flex;
  justify-content: center;
}

.screenshot-frame {
  background: #111;
  border-radius: 24px;
  padding: 8px;
  max-width: 230px;     /* 控制最大寬度，避免跑版 */
  width: 100%;
  box-shadow: 0 12px 28px rgba(0,0,0,0.2);
}

.screenshot-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

/* 保留占位樣式（若之後還想用文字框就用這個） */
.screenshot-placeholder {
  border-radius: 20px;
  padding: 40px 16px;
  text-align: center;
  font-size: 14px;
  color: #555;
  background: linear-gradient(135deg, var(--blue-light), #ffffff);
  border: 2px dashed rgba(0,0,0,0.18);
}

/* Footer */

.site-footer {
  background: var(--blue);
  color: #fff;
  padding: 24px 0 28px;
  margin-top: 32px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.footer-logo {
  font-size: 22px;
}

.footer-text {
  margin: 4px 0 0;
  font-size: 13px;
  opacity: 0.9;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 14px;
}

.footer-links a {
  color: #fff;
  text-decoration: none;
  opacity: 0.9;
}

.footer-links a:hover {
  opacity: 1;
}

/* RWD */

@media (max-width: 720px) {
  .nav {
    display: none; /* 先簡化：手機直接隱藏上方導覽 */
  }

  .hero {
    text-align: center;
  }

  .hero-inner {
    flex-direction: column;
  }

  .hero-text {
    order: 1;
  }

  .hero-phone {
    order: 0;
  }
}

/* Video Section */
.video-wrapper {
  display: flex;
  justify-content: center;
  margin: 0 auto;
  max-width: 720px;      /* 控制最大寬度，不會爆掉 */
}

.promo-video {
  width: 100%;
  max-width: 720px;
  border-radius: 20px;
  display: block;
  margin: 0 auto;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
}