/* ============================================
   RESET & BASE
============================================ */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #2a3547;
  min-height: 100vh;
  position: relative;
}

/* ============================================
   BACKGROUND (thay ảnh tại /images/background.jpg)
   Ảnh gợi ý: đồng lúa / cánh đồng xanh / nông thôn Việt Nam
============================================ */
.page-background {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image: url("../images/background.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  /* fallback màu xanh đồng lúa khi chưa có ảnh thật */
  background-color: #4a7c3c;
}

@media (min-width: 769px) {
  .page-background {
    background-attachment: fixed;
  }
}

.page-overlay {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(10, 30, 15, 0.15) 0%, rgba(10, 30, 15, 0.3) 100%);
}

/* ============================================
   LAYOUT
============================================ */
.register-wrapper {
  min-height: 100vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 40px 16px;
  gap: 32px;
}

@media (min-width: 769px) {
  .register-wrapper {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .register-wrapper {
    padding: 24px 16px;
    gap: 16px;
  }
}

/* ============================================
   HERO TEXT (nội dung placeholder, dễ đổi sau)
============================================ */
.hero-text {
  max-width: 640px;
  text-align: center;
  padding: 0 8px;
}

.hero-title {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.2;
  color: #ffffff;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 17px;
  font-weight: 500;
  color: #f1f5f2;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.4);
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 22px;
    margin-bottom: 6px;
  }

  .hero-subtitle {
    font-size: 13px;
  }
}

/* ============================================
   REGISTER CARD (CTA sang trang đăng ký thật)
============================================ */
.register-card {
  width: 100%;
  max-width: 520px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  padding: 32px;
}

@media (max-width: 480px) {
  .register-card {
    padding: 18px;
    margin: 0;
  }
}

.register-title {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  color: #1a2438;
  margin-bottom: 12px;
}

.register-desc {
  font-size: 14px;
  color: #5b6b82;
  text-align: center;
  margin-bottom: 24px;
}

@media (max-width: 480px) {
  .register-title {
    font-size: 19px;
    margin-bottom: 8px;
  }

  .register-desc {
    font-size: 13px;
    margin-bottom: 16px;
  }
}

/* ============================================
   SUBMIT BUTTON (link ra trang đăng ký thật)
============================================ */
.submit-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 52px;
  border: none;
  border-radius: 8px;
  background: linear-gradient(135deg, #2f9e44, #237a34);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
  box-shadow: 0 8px 20px rgba(47, 158, 68, 0.3);
}

.submit-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(47, 158, 68, 0.4);
}

.submit-button:active {
  transform: translateY(0);
}

@media (max-width: 480px) {
  .submit-button {
    height: 46px;
    font-size: 15px;
  }
}