/* Lớp nội dung đủ trong để nhìn thấy ruộng lúa, nhưng giữ chữ đậm và rõ. */
:root {
  --ink: #142d1d;
  --dark: #113b27;
  --glass: rgba(255, 248, 218, .30);
  --dark-glass: rgba(12, 46, 27, .68);
}

body {
  color: #142d1d;
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
}

.glass {
  background: var(--glass);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, .65);
  box-shadow: 0 22px 60px rgba(56, 39, 5, .13);
}

.glass-dark {
  background: var(--dark-glass);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.question,
.problem {
  background: rgba(255, 249, 225, .22);
}

h1, h2, h3, .display,
.manifesto-card blockquote,
.effect-card blockquote,
.journey-end {
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-weight: 700;
  letter-spacing: -.045em;
  line-height: 1.18;
}

em { font-style: normal; }

.eyebrow,
.kicker,
.stage-day {
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-size: .9rem;
  font-weight: 800;
  letter-spacing: .095em;
  line-height: 1.5;
}

.stage-day { font-size: .92rem; }
.lead { font-size: clamp(1.13rem, 1.7vw, 1.5rem); }

/* Header & Brand trong suốt, không che bầu trời */
.site-header {
  padding: 22px 0 10px;
  background: transparent !important;
}
.site-header .wrap.header-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  background: transparent !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  border: none !important;
  box-shadow: none !important;
  border-radius: 0 !important;
  padding: 0 !important;
}

.brand {
  min-width: 0;
  gap: 17px;
  flex: none;
  filter: drop-shadow(0 2px 2px rgba(255, 250, 224, .7));
}

.brand img {
  width: 108px;
  height: 128px;
  object-fit: contain;
  flex: none;
}

.brand b,
.footer-brand strong {
  display: block;
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: .13em;
  line-height: 1.25;
}

.brand b { color: #0d3924; }

.brand small,
.footer-brand small {
  display: block;
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-size: .79rem;
  font-weight: 700;
  letter-spacing: .09em;
  line-height: 1.4;
  text-transform: uppercase;
}

.brand small { color: #31512c; }

.nav-shell {
  margin-left: auto;
  padding: 8px 14px 8px 22px;
  border: 1px solid rgba(255, 255, 255, .75);
  border-radius: 100px;
  background: rgba(255, 255, 255, .68);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(25, 45, 25, .08);
}

.main-nav a { font-size: .8rem; color: #163b25; }
.main-nav .nav-contact { font-size: .8rem; }

/* Tiêu đề tiếng Việt rõ, gọn và không dùng chữ nghiêng serif. */
.hero-copy h1 {
  font-size: clamp(3rem, 5.25vw, 5.4rem);
  line-height: 1.12;
  color: #0e3422;
  overflow-wrap: normal;
}

.hero-copy h1 em {
  display: block;
  color: #84500c;
}

.hero-copy,
.story-card,
.stage-body,
.next-card,
.detail-grid,
.contact-copy,
.contact-form {
  color: #102c1e;
  text-shadow: 0 1px 1px rgba(255, 251, 233, .48);
}

.hero-aside h2 { font-size: clamp(2rem, 2.7vw, 2.8rem); }
.hero-aside .eyebrow { font-size: .82rem; }
.hero-aside .aside-number { font-family: 'Be Vietnam Pro', Arial, sans-serif; font-weight: 700; }

/* Tiêu đề timeline có tấm trong suốt riêng để không chìm vào nền lúa. */
.journey-top {
  padding: 32px 38px;
  border-radius: 12px;
  background: rgba(255, 248, 218, .30);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, .65);
  box-shadow: 0 20px 55px rgba(56, 39, 5, .13);
}

.journey-top h2 {
  color: #092a1b;
  font-size: clamp(2.6rem, 4.7vw, 4.9rem);
  font-weight: 800;
  line-height: 1.16;
  text-shadow: 0 1px 1px rgba(255, 251, 232, .6);
}

.journey-top p {
  max-width: 340px;
  color: #102d1c;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.6;
  text-shadow: 0 1px 1px rgba(255, 251, 232, .65);
}

.stage-body h3 { color: #0c3320; font-size: clamp(1.65rem, 2.4vw, 2.5rem); }
.stage-body p { font-size: 1rem; }
.stage-count span { font-family: 'Be Vietnam Pro', Arial, sans-serif; font-weight: 700; }
.story-grid h2 { color: #0b301f; }
.story-card .lead { font-weight: 600; }

.product-hero-copy h1 {
  font-size: clamp(3rem, 5.5vw, 5.9rem);
  line-height: 1.14;
}

.detail-grid h2 { font-size: clamp(2.5rem, 4vw, 4.4rem); }

.footer {
  background: rgba(10, 41, 25, .68);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
}

.footer-brand { margin-bottom: 17px; }
.footer-brand strong { color: #ffe1a2; }
.footer-brand small { color: #f2e6bf; margin-top: 3px; }
.footer b { font-size: 1rem; }

@media (max-width: 1180px) {
  .brand img { width: 90px; height: 105px; }
  .brand b { font-size: 1.45rem; }
  .brand small { font-size: .68rem; }
  .menu-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: calc(100% + 7px);
    left: auto;
    right: 0;
    width: min(330px, calc(100vw - 35px));
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, .6);
    border-radius: 18px;
    background: rgba(255, 247, 217, .9);
    box-shadow: 0 18px 50px rgba(37, 29, 4, .2);
    backdrop-filter: blur(12px);
    z-index: 80;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px; font-size: .9rem; }
  .main-nav .nav-contact { text-align: center; margin-top: 9px; }
  .nav-shell { position: relative; }
}

@media (max-width: 780px) {
  .hero { padding-top: 30px; }
  .hero-copy h1 { font-size: clamp(2.85rem, 8.8vw, 4.2rem); }
  .journey-top { padding: 26px; }
  .journey-top h2 { font-size: clamp(2.35rem, 7vw, 3.8rem); }
  .journey-top p { max-width: 100%; margin-top: 18px; }
  .main-nav { top: calc(100% + 9px); left: auto; right: 0; }
}

@media (max-width: 520px) {
  .menu-toggle { padding: 7px 11px; }
  .hero-copy h1 { font-size: clamp(2.5rem, 11vw, 3.25rem); }
  .eyebrow, .kicker { font-size: .8rem; }
  .journey-top { padding: 23px; }
  .journey-top h2 { font-size: 2.25rem; }
  .journey-top p { font-size: 1rem; }
  .footer-brand strong { font-size: 1.42rem; }
  .footer-brand small { font-size: .66rem; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal.visible { animation: none; }
}

/* Bản cập nhật: Header và container của brand hoàn toàn trong suốt, logo to nổi bật trên nền trời sáng */
.site-header {
  position: relative;
  z-index: 50;
  padding: 24px 0 16px;
  background: transparent !important;
}
.site-header .wrap.header-layout {
  gap: 36px;
  padding: 0 !important;
  background: transparent !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  min-height: auto;
}
.brand {
  gap: 26px;
  min-width: 0;
  text-decoration: none;
  background: transparent !important;
}
.brand img {
  /* Logo to gấp đôi hiện tại */
  width: 290px;
  height: auto;
  max-height: 200px;
  object-fit: contain;
  filter: drop-shadow(0 6px 14px rgba(13, 52, 30, 0.16));
  transition: transform .25s ease;
}
.brand:hover img {
  transform: scale(1.03);
}
.brand b {
  font-size: 2.85rem;
  letter-spacing: .12em;
  color: #0e371f;
  line-height: 1.05;
}
.brand small {
  font-size: 1.25rem;
  letter-spacing: .1em;
  color: #275822;
  font-weight: 700;
  margin-top: 6px;
}

/* Ảnh mùa vụ và nhãn chai là hai vùng độc lập để chi tiết ảnh không bị che. */
.stage-photo > img { object-position: 60% center; }
.stage-row:first-child .stage-photo > img { object-position: 70% center; }
.stage-row:last-child .stage-photo > img { object-position: 72% center; }
.stage-photo::after { display: none; }
.stage-body { position: relative; }
.stage-product {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  padding: 11px 14px;
  min-height: 122px;
  border-radius: 12px;
  background: rgba(255, 250, 226, .34);
  border: 1px solid rgba(255, 255, 255, .5);
}
.stage-product > span,
.bottle-caption > span {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: #36532e;
}
.stage-product .bottle-window { flex: none; width: 60px; height: 100px; }
.bottle-window {
  position: relative;
  inset: auto;
  display: block;
  overflow: hidden;
  filter: drop-shadow(0 7px 8px rgba(26, 34, 13, .2));
}
.bottle-window img,
.stage-product .bottle-window img,
.product-hero-art .bottle-window img {
  position: absolute;
  display: block;
  width: auto;
  height: 100%;
  max-width: none;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}
.bottle-window--front img,
.stage-product .bottle-window--front img,
.product-hero-art .bottle-window--front img {
  width: auto;
  height: 100%;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}
.product-hero-art {
  height: auto;
  margin-top: 0;
  border-radius: 120px 14px 14px 14px;
  background: rgba(255, 249, 225, .38);
}
.product-hero-art::after { display: none; }
.art-photo { position: relative; height: 390px; overflow: hidden; }
.art-photo > img.photo { display: block; width: 100%; height: 100%; object-fit: cover; }
.product-hero-art .art-photo .art-label {
  left: 24px;
  bottom: 19px;
  padding: 7px 11px;
  border-radius: 6px;
  background: rgba(13, 52, 30, .7);
  color: #fff;
  text-shadow: none;
  line-height: 1.45;
}
.product-hero-art:has(.bottle-window--front) .art-photo > img.photo { object-position: 55% center; }
.product-hero-art:has(img[src*="root-turbo.svg"]) .art-photo > img.photo { object-position: 68% center; }
.product-hero-art:has(img[src*="vo-gao-promax.svg"]) .art-photo > img.photo { object-position: 70% center; }
.product-bottle-card {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 195px;
  padding: 12px 25px;
  border-top: 1px solid rgba(255, 255, 255, .6);
  background: rgba(255, 247, 215, .56);
}
.product-hero-art .product-bottle-card .bottle-window {
  flex: none;
  width: 94px;
  height: 170px;
  right: auto;
  bottom: auto;
}
.bottle-caption { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.bottle-caption strong { color: #173c28; font-size: clamp(1.18rem, 2vw, 1.75rem); line-height: 1.25; }
.bottle-caption small { color: #52663e; font-weight: 700; }

/* Các bước không dùng Georgia và không bị ngắt giữa chữ tiếng Việt. */
.flow { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.flow-step {
  min-width: 0;
  padding: 16px 12px 20px;
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-size: clamp(1.1rem, 1.5vw, 1.38rem);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.025em;
  overflow-wrap: normal;
  word-break: normal;
  hyphens: none;
}
.flow-step:not(:last-child)::after { right: -19px; top: 15px; }
.effect-card blockquote { font-size: clamp(1.35rem, 2.1vw, 2rem); line-height: 1.5; }
.product-hero-copy h1 em { color: #79480a; }

@media (max-width: 1250px) {
  .site-header .wrap.header-layout { padding: 0 !important; gap: 26px; }
  .brand img { width: 245px; }
  .brand b { font-size: 2.45rem; }
  .brand small { font-size: 1.08rem; }
}
@media (max-width: 980px) {
  .site-header .wrap.header-layout { padding: 0 !important; gap: 18px; border-radius: 0 !important; }
  .brand img { width: 210px; }
  .brand b { font-size: 2.1rem; }
  .brand small { font-size: .92rem; }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 18px; }
  .flow-step:nth-child(2)::after { display: none; }
  .product-hero-art { margin-top: 18px; }
}
@media (max-width: 780px) {
  .site-header { padding: 12px 0 6px; }
  .site-header .wrap.header-layout { border-radius: 0 !important; padding: 0 !important; }
  .nav-shell {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }
  .brand img { width: 185px; }
  .brand b { font-size: 1.85rem; }
  .brand small { font-size: .82rem; }
  .stage-photo { height: 300px; }
  .art-photo { height: 365px; }
}
@media (max-width: 620px) {
  .flow { grid-template-columns: 1fr; }
  .flow-step { font-size: 1.13rem; padding: 11px 8px 15px; }
  .flow-step:not(:last-child)::after { display: none; }
  .effect-card { padding-inline: 24px; }
}
@media (max-width: 520px) {
  .site-header .wrap.header-layout { gap: 12px; padding: 0 !important; }
  .brand { gap: 14px; min-width: 0; }
  .brand img { width: 145px; }
  .brand b { font-size: 1.55rem; letter-spacing: .08em; }
  .brand small { font-size: .68rem; letter-spacing: .03em; }
  .art-photo { height: 310px; }
  .product-bottle-card { height: 175px; gap: 10px; padding: 8px 16px; }
  .product-hero-art .product-bottle-card .bottle-window { width: 85px; height: 150px; }
  .bottle-caption strong { font-size: 1.2rem; }
  .stage-photo { height: 250px; }
}
@media (max-width: 460px) {
  .site-header .wrap.header-layout { flex-wrap: wrap; }
  .nav-shell { margin-left: auto; }
  .brand { width: 100%; }
}

/* ============================================================
   Typography refinement: Thanh mảnh, thoáng chữ & to hơn
   ============================================================ */
.btn {
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 13px 26px;
}
.btn.ghost {
  font-weight: 500;
}
.arrow-link {
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* ============================================================
   Loại bỏ hoàn toàn icon mũi tên trên iOS, Android và màn hình di động/cảm ứng
   ============================================================ */
html.mobile-os .btn::after,
html.mobile-os .arrow-link::after,
html.os-ios .btn::after,
html.os-ios .arrow-link::after,
html.os-android .btn::after,
html.os-android .arrow-link::after {
  display: none !important;
  content: none !important;
}

html.mobile-os .btn,
html.os-ios .btn,
html.os-android .btn {
  gap: 0 !important;
}

html.mobile-os .arrow-link,
html.os-ios .arrow-link,
html.os-android .arrow-link {
  gap: 0 !important;
}

@media (max-width: 980px), (pointer: coarse) {
  .btn::after,
  .arrow-link::after {
    display: none !important;
    content: none !important;
  }
  .btn,
  .arrow-link {
    gap: 0 !important;
  }
}
.question p {
  font-size: 1.08rem;
  font-weight: 450;
  line-height: 1.6;
  color: var(--ink);
}
.question b {
  font-size: 2.3rem;
  font-weight: 400;
}

/* ============================================================
   Stage Product Image: Scale fit & Clickable to product page
   ============================================================ */
.stage-product {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 24px;
  padding: 14px 18px;
  min-height: 140px;
  border-radius: 14px;
  background: rgba(255, 250, 226, .5);
  border: 1px solid rgba(255, 255, 255, .6);
  box-shadow: 0 4px 20px rgba(52, 40, 5, .06);
  overflow: hidden;
}
.stage-product-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  cursor: pointer;
}
.stage-product-link img {
  max-width: 100%;
  max-height: 130px;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: transform .3s ease, filter .3s ease;
  filter: drop-shadow(0 6px 12px rgba(25, 45, 20, .15));
}
.stage-product-link:hover img {
  transform: scale(1.05);
  filter: drop-shadow(0 10px 18px rgba(25, 45, 20, .25));
}

/* ============================================================
   Product Hero: Bottle Window popup click hint
   ============================================================ */
.product-hero-art .bottle-window {
  cursor: pointer;
  position: relative;
  transition: transform .25s ease;
}
.product-hero-art .bottle-window:hover {
  transform: scale(1.04);
}
.zoom-badge {
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(13, 52, 30, 0.85);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 100px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0.9;
}

/* ============================================================
   Image Modal Popup Frame (Desktop & Mobile scale fit)
   ============================================================ */
.image-modal {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(10, 28, 18, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.image-modal.open {
  opacity: 1;
  pointer-events: auto;
}
.modal-backdrop {
  position: absolute;
  inset: 0;
  cursor: pointer;
}
.modal-content {
  position: relative;
  z-index: 2;
  max-width: 92vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-content img {
  max-width: 90vw;
  max-height: 84vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
  animation: modal-pop .25s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes modal-pop {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.modal-close {
  position: absolute;
  top: -46px;
  right: 0;
  background: rgba(255, 255, 255, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  font-size: 1.4rem;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s, transform .2s;
}
.modal-close:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.1);
}

/* ============================================================
   Product Full View Section (Section ngay dưới product-hero)
   ============================================================ */
.product-full-view {
  padding: 40px 0 70px;
}
.product-full-card {
  padding: 48px clamp(24px, 5vw, 64px);
  border-radius: 18px;
  text-align: center;
}
.product-full-card .full-view-header {
  max-width: 720px;
  margin: 0 auto 32px;
}
.product-full-card .full-view-header h2 {
  font-size: clamp(2rem, 3.5vw, 3.2rem);
  color: #1a3c28;
  margin: 12px 0 14px;
}
.product-full-card .full-view-header .eyebrow {
  justify-content: center;
}
.full-view-artwork {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  background: rgba(255, 255, 255, 0.45);
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 12px 35px rgba(25, 45, 20, 0.08);
}
.full-view-artwork img {
  width: 100%;
  max-width: 1100px;
  height: auto;
  object-fit: contain;
  display: block;
  margin: 0 auto;
  border-radius: 8px;
  filter: drop-shadow(0 10px 24px rgba(20, 40, 15, 0.15));
}

/* ============================================================
   MINORI Root Turbo: Thành phần dinh dưỡng & Phân tích chuyên sâu
   ============================================================ */
.composition-section {
  padding: 60px 0;
}
.composition-card-wrap {
  padding: 48px clamp(24px, 5vw, 60px);
  border-radius: 16px;
}
.composition-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 36px;
}
.composition-header h2 {
  font-size: clamp(2.2rem, 3.8vw, 3.5rem);
  color: #123824;
  margin: 12px 0 16px;
}
.composition-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}
.nutrient-card {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(184, 129, 39, 0.35);
  border-radius: 12px;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
  overflow: hidden;
}
.nutrient-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #b88127, #f4ce69);
  opacity: 0.85;
}
.nutrient-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(45, 30, 8, 0.12);
  border-color: rgba(184, 129, 39, 0.6);
}
.nutrient-val {
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-size: clamp(2.4rem, 3.6vw, 3.2rem);
  font-weight: 800;
  color: #8c570f;
  line-height: 1;
  margin-bottom: 8px;
}
.nutrient-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #143823;
  margin-bottom: 4px;
}
.nutrient-en {
  font-size: 0.78rem;
  color: #556c4b;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.nutrient-desc {
  font-size: 0.88rem;
  line-height: 1.55;
  color: #1e382b;
  margin-top: auto;
}
.composition-disclaimer {
  border-left: 3px solid #b88127;
  padding: 14px 18px;
  background: rgba(255, 251, 235, 0.6);
  border-radius: 0 8px 8px 0;
  font-size: 0.86rem;
  color: #43381a;
  margin-bottom: 24px;
}

/* ============================================================
   Scientific Details / Research Expandable Box
   ============================================================ */
.research-expandable {
  margin-top: 20px;
  border: 1px solid rgba(84, 65, 28, 0.2);
  border-radius: 12px;
  background: rgba(255, 252, 240, 0.45);
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.research-expandable:focus-within {
  border-color: #1b4930;
}
.research-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  color: #143d26;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.5);
  list-style: none;
  user-select: none;
  transition: background 0.2s;
}
.research-summary::-webkit-details-marker {
  display: none;
}
.research-summary:hover {
  background: rgba(255, 255, 255, 0.75);
}
.research-summary:focus-visible {
  outline: 2px solid #143d26;
  outline-offset: -2px;
}
.summary-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: #8c5a14;
  font-weight: 600;
}
.summary-chevron {
  display: inline-block;
  transition: transform 0.25s ease;
  font-size: 0.9rem;
}
details[open] .summary-chevron {
  transform: rotate(180deg);
}
.research-body {
  padding: 24px clamp(20px, 4vw, 32px);
  border-top: 1px solid rgba(84, 65, 28, 0.15);
  font-size: 0.92rem;
  line-height: 1.65;
  color: #1b3829;
}
.research-intro {
  margin-bottom: 20px;
  font-size: 0.95rem;
}
.research-list {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}
.research-item {
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.55);
  border-radius: 8px;
  border-left: 3px solid #366649;
}
.research-item strong {
  color: #113824;
}
.reference-links {
  border-top: 1px dashed rgba(84, 65, 28, 0.25);
  padding-top: 18px;
  margin-top: 20px;
}
.reference-links h4 {
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #7a5316;
  margin: 0 0 10px;
}
.reference-links ol {
  margin: 0;
  padding-left: 20px;
}
.reference-links li {
  margin-bottom: 8px;
  font-size: 0.84rem;
}
.reference-links a {
  color: #1b5336;
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}
.reference-links a:hover {
  color: #9c641a;
}
.research-disclaimer {
  margin-top: 16px;
  font-size: 0.82rem;
  color: #555;
  font-style: italic;
}

/* ============================================================
   Section: Công nghệ Nhật Bản – Kiểm chứng trên đồng ruộng VN
   ============================================================ */
.japan-tech-section {
  padding: 70px 0;
}
.japan-tech-card {
  padding: 56px clamp(26px, 5.5vw, 72px);
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(14, 48, 29, 0.92) 0%, rgba(10, 36, 22, 0.95) 100%);
  border: 1px solid rgba(244, 206, 105, 0.35);
  box-shadow: 0 24px 65px rgba(10, 30, 18, 0.35);
  color: #f7f3e6;
  position: relative;
  overflow: hidden;
}
.japan-tech-card::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(244, 206, 105, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.japan-tech-header {
  text-align: center;
  max-width: 840px;
  margin: 0 auto 42px;
}
.japan-tech-header .eyebrow {
  justify-content: center;
  color: #f4ce69;
}
.japan-tech-header .eyebrow::before {
  background: #f4ce69;
}
.japan-tech-header h2 {
  font-size: clamp(2.3rem, 4.2vw, 3.8rem);
  color: #fff;
  margin: 14px 0 16px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}
.japan-tech-header p.lead {
  color: #ebdcb2;
}
.japan-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 32px;
}
.japan-col {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 14px;
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.25s ease, background 0.25s ease;
}
.japan-col:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.12);
}
.japan-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  font-weight: 800;
  text-transform: uppercase;
  color: #f4ce69;
  margin-bottom: 14px;
}
.japan-col h3 {
  font-size: 1.32rem;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.35;
}
.japan-col p {
  font-size: 0.92rem;
  line-height: 1.62;
  color: #e5dac2;
  margin: 0;
}
.japan-note-box {
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(244, 206, 105, 0.22);
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 0.84rem;
  line-height: 1.55;
  color: #d6ccb2;
}

/* ============================================================
   Section: Chăm rễ đúng lúc, theo dõi đúng điều
   ============================================================ */
.field-guide-section {
  padding: 60px 0;
}
.field-guide-card {
  padding: 50px clamp(24px, 5vw, 64px);
  border-radius: 16px;
}
.field-guide-header {
  margin-bottom: 36px;
}
.field-guide-header h2 {
  font-size: clamp(2.2rem, 3.8vw, 3.4rem);
  color: #123824;
  margin: 12px 0 14px;
}
.field-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.guide-step {
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(84, 65, 28, 0.18);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.guide-step:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(45, 30, 8, 0.08);
}
.step-num {
  font-family: 'Be Vietnam Pro', Arial, sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: #9c641a;
  line-height: 1;
  flex: none;
}
.step-body h3 {
  font-size: 1.15rem;
  color: #123824;
  margin-bottom: 8px;
}
.step-body p {
  font-size: 0.9rem;
  line-height: 1.58;
  color: #1c3628;
  margin: 0;
}

/* ============================================================
   Section: Câu hỏi thường gặp (FAQ)
   ============================================================ */
.faq-section {
  padding: 60px 0 90px;
}
.faq-card {
  padding: 50px clamp(24px, 5vw, 64px);
  border-radius: 16px;
}
.faq-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 36px;
}
.faq-header h2 {
  font-size: clamp(2.1rem, 3.6vw, 3.2rem);
  color: #123824;
  margin: 12px 0 14px;
}
.faq-list {
  display: grid;
  gap: 14px;
  max-width: 900px;
  margin: 0 auto;
}
.faq-item {
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(84, 65, 28, 0.2);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.faq-item:focus-within {
  border-color: #154228;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  font-size: 1.02rem;
  font-weight: 700;
  color: #123824;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.faq-question::-webkit-details-marker {
  display: none;
}
.faq-question:hover {
  background: rgba(255, 255, 255, 0.8);
}
.faq-question:focus-visible {
  outline: 2px solid #143d26;
  outline-offset: -2px;
}
.faq-toggle-icon {
  font-size: 1.3rem;
  font-weight: 400;
  color: #9c641a;
  transition: transform 0.25s ease;
  flex: none;
  margin-left: 14px;
  line-height: 1;
}
details[open] .faq-toggle-icon {
  transform: rotate(45deg);
}
.faq-answer {
  padding: 0 22px 20px;
  font-size: 0.92rem;
  line-height: 1.62;
  color: #1b3829;
}
.faq-answer p {
  margin: 0;
}

/* Responsive adjustments */
@media (max-width: 980px) {
  .composition-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .japan-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .field-guide-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}
@media (max-width: 580px) {
  .composition-grid {
    grid-template-columns: 1fr;
  }
  .guide-step {
    flex-direction: column;
    gap: 8px;
  }
  .nutrient-card {
    padding: 20px 16px;
  }
}