:root {
  --rungrueang-white: #ffffff;
  --rungrueang-off-white: #fafafa;
  --rungrueang-black: #0a0a0a;
  --rungrueang-gray-dark: #333333;
  --rungrueang-gray-light: #777777;
  --rungrueang-gold: #d4af37;
  --rungrueang-gold-dark: #b8962d;
  --rungrueang-border: #eeeeee;
  
  --font-serif: 'Playfair Display', serif;
  --font-sans: 'Inter', 'Sarabun', sans-serif;
  --font-display: 'Chakra Petch', sans-serif;
}

/* Base Resets for this specific section */
.bg-white { background-color: var(--rungrueang-white); }
.bg-gray { background-color: var(--rungrueang-off-white); }
.bg-black { background-color: var(--rungrueang-black); }
.text-white { color: var(--rungrueang-white) !important; }

/* --- 2. LUXURY TYPOGRAPHY & UTILITIES --- */
.rungrueang-gold-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--rungrueang-gold);
  text-transform: uppercase;
  letter-spacing: 4px;
  margin-bottom: 20px;
}

.rungrueang-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 56px);
  color: var(--rungrueang-black);
  line-height: 1.25;
  margin-bottom: 30px;
  letter-spacing: -0.5px;
}

.rungrueang-gold-line {
  width: 80px;
  height: 2px;
  background-color: var(--rungrueang-gold);
  margin-bottom: 35px;
}
.rungrueang-gold-line.center-line {
  margin-left: auto;
  margin-right: auto;
}

.rungrueang-hero-desc {
  font-family: var(--font-sans);
  font-size: 18px;
  color: var(--rungrueang-gray-light);
  line-height: 1.8;
  max-width: 800px;
}

/* --- 3. HERO SECTION --- */
.rungrueang-hero-sec {
  padding: 120px 0 80px;
  border-bottom: 1px solid var(--rungrueang-border);
}
.rungrueang-hero-container {
  display: flex;
  justify-content: center;
  text-align: center;
}
.rungrueang-hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* --- 4. SERVICE DETAILS (THE BIG LAYOUT) --- */
.rungrueang-service-detail {
  padding: 120px 0;
  border-bottom: 1px solid var(--rungrueang-border);
  overflow: hidden;
}

.rungrueang-service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.rungrueang-service-grid.reverse-grid {
  /* สลับตำแหน่งซ้ายขวาด้วย Flex direction ใน Grid ไม่ค่อยเวิร์ค ใช้ order ดีกว่า */
}

/* ฝั่งข้อความ */
.rungrueang-service-text {
  position: relative;
  padding-left: 20px;
}
.rungrueang-service-number {
  position: absolute;
  top: -80px;
  left: -20px;
  font-family: var(--font-serif);
  font-size: 180px;
  font-weight: 700;
  color: rgba(0,0,0,0.03);
  line-height: 1;
  z-index: 0;
  pointer-events: none;
}
.bg-gray .rungrueang-service-number {
  color: rgba(0,0,0,0.04);
}

.rungrueang-service-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--rungrueang-black);
  margin-bottom: 25px;
  position: relative;
  z-index: 1;
}

.rungrueang-lead-p {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--rungrueang-gray-dark);
  line-height: 1.8;
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
}

/* ส่วนเจาะลึกรายละเอียด (Deep Detail) */
.rungrueang-deep-detail {
  position: relative;
  z-index: 1;
  background: var(--rungrueang-white);
  padding: 40px;
  border: 1px solid var(--rungrueang-border);
  border-left: 3px solid var(--rungrueang-gold);
  box-shadow: 0 20px 50px rgba(0,0,0,0.02);
}
.bg-gray .rungrueang-deep-detail {
  background: var(--rungrueang-off-white);
  border-color: #e5e5e5;
}

.rungrueang-detail-heading {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--rungrueang-black);
  margin-bottom: 25px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.rungrueang-luxury-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.rungrueang-luxury-list li {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 20px;
}
.rungrueang-luxury-list li:last-child {
  margin-bottom: 0;
}
.rungrueang-luxury-list li i {
  color: var(--rungrueang-gold);
  font-size: 14px;
  margin-top: 6px; /* Align with first line of text */
}
.rungrueang-luxury-list li div {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--rungrueang-gray-light);
  line-height: 1.7;
}
.rungrueang-luxury-list li strong {
  color: var(--rungrueang-black);
  font-weight: 600;
}

/* ฝั่งรูปภาพ */
.rungrueang-service-visual {
  position: relative;
}
.rungrueang-image-frame {
  position: relative;
  padding: 0 0 40px 40px;
}
.rungrueang-image-frame::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 0;
  right: 40px;
  bottom: 0;
  border: 1px solid var(--rungrueang-gold);
  z-index: 0;
}
.rungrueang-image-frame img {
  position: relative;
  width: 100%;
  height: 650px;
  object-fit: cover;
  z-index: 1;
  box-shadow: 0 30px 60px rgba(0,0,0,0.1);
  filter: grayscale(20%); /* ให้ภาพดูขรึมขึ้นนิดนึง เข้ากับโทนขาวดำ */
  transition: 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.rungrueang-service-visual:hover img {
  filter: grayscale(0%);
  transform: scale(1.02);
}

.offset-frame { padding: 40px 40px 0 0; }
.offset-frame::before { top: 0; left: 40px; right: 0; bottom: 40px; }

/* ป้ายสถิติบนรูป */
.rungrueang-visual-badge {
  position: absolute;
  bottom: 10px;
  left: 10px;
  background: var(--rungrueang-white);
  padding: 30px;
  z-index: 2;
  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
  border-top: 4px solid var(--rungrueang-gold);
}
.alt-badge {
  bottom: auto; top: 10px; left: auto; right: 10px;
}
.rungrueang-visual-badge h5 {
  font-family: var(--font-serif);
  font-size: 48px;
  color: var(--rungrueang-black);
  margin: 0 0 5px 0;
  line-height: 1;
}
.rungrueang-visual-badge span {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--rungrueang-gray-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* --- 5. THE WARRANTY SECTION (DARK ELEGANCE) --- */
.rungrueang-warranty-sec {
  padding: 120px 0;
}
.rungrueang-w-header {
  text-align: center;
  margin-bottom: 80px;
}
.rungrueang-w-header .rungrueang-hero-desc {
  margin-inline: auto;
  color: #aaaaaa;
}

.rungrueang-warranty-boxes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.rungrueang-w-box {
  background: #111111;
  border: 1px solid #222222;
  padding: 60px 50px;
  transition: 0.4s ease;
  position: relative;
  overflow: hidden;
}
.rungrueang-w-box::after {
  content: "";
  position: absolute;
  top: 0; right: 0; width: 100px; height: 100px;
  background: radial-gradient(circle at top right, rgba(212,175,55,0.1), transparent 70%);
}
.rungrueang-w-box:hover {
  border-color: var(--rungrueang-gold);
  transform: translateY(-10px);
}

.rungrueang-w-number {
  font-family: var(--font-serif);
  font-size: 80px;
  color: var(--rungrueang-gold);
  line-height: 1;
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.rungrueang-w-number span {
  font-family: var(--font-sans);
  font-size: 16px;
  color: #ffffff;
  letter-spacing: 3px;
}
.rungrueang-w-divider {
  width: 100%;
  height: 1px;
  background: #333333;
  margin-bottom: 30px;
}
.rungrueang-w-title {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--rungrueang-white);
  margin-bottom: 20px;
  line-height: 1.4;
}
.rungrueang-w-desc {
  font-family: var(--font-sans);
  font-size: 15px;
  color: #888888;
  line-height: 1.8;
}
.rungrueang-w-desc strong {
  color: #dddddd;
  font-weight: 500;
}

/* --- 6. THE FAQ MASTERCLASS (CUSTOM ACCORDION) --- */
.rungrueang-faq-sec {
  padding: 120px 0;
}
.rungrueang-faq-header {
  text-align: center;
  margin-bottom: 60px;
}

.rungrueang-faq-accordion {
  max-width: 900px;
  margin: 0 auto;
  border-top: 1px solid var(--rungrueang-black);
}

.rungrueang-accordion-item {
  border-bottom: 1px solid var(--rungrueang-border);
}

/* Custom Button instead of Details/Summary for better animation control */
.rungrueang-accordion-btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 35px 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: 0.3s;
}
.rungrueang-accordion-btn:hover .rungrueang-q-text {
  color: var(--rungrueang-gold);
}

.rungrueang-q-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--rungrueang-black);
  padding-right: 40px;
  transition: 0.3s;
}

/* The Animated Cross Icon */
.rungrueang-q-icon {
  position: relative;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}
.rungrueang-q-icon::before, .rungrueang-q-icon::after {
  content: "";
  position: absolute;
  background-color: var(--rungrueang-black);
  transition: 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.rungrueang-q-icon::before {
  top: 11px; left: 0; width: 24px; height: 2px;
}
.rungrueang-q-icon::after {
  top: 0; left: 11px; width: 2px; height: 24px;
}

.rungrueang-accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0, 1, 0, 1);
  padding: 0 20px;
}
.rungrueang-accordion-content p {
  padding-bottom: 35px;
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--rungrueang-gray-light);
  line-height: 1.8;
  margin: 0;
}
.rungrueang-accordion-content p strong {
  color: var(--rungrueang-black);
}

/* Active State Styles */
.rungrueang-accordion-item.active .rungrueang-q-text {
  color: var(--rungrueang-gold);
}
.rungrueang-accordion-item.active .rungrueang-q-icon::before,
.rungrueang-accordion-item.active .rungrueang-q-icon::after {
  background-color: var(--rungrueang-gold);
}
.rungrueang-accordion-item.active .rungrueang-q-icon::after {
  transform: rotate(90deg);
  opacity: 0; /* Turns Plus into Minus */
}
.rungrueang-accordion-item.active .rungrueang-accordion-content {
  max-height: 1000px; /* Arbitrary large number for CSS transition */
  transition: max-height 1s ease-in-out;
}

/* --- 7. RESPONSIVE MASTERCLASS --- */

@media (min-width: 1025px) {
  /* สลับฝั่งในหน้าจอใหญ่ */
  .reverse-grid .rungrueang-service-visual { order: 2; }
  .reverse-grid .rungrueang-service-text { order: 1; }
}

@media (max-width: 1024px) {
  .rungrueang-service-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  .rungrueang-image-frame img { height: 500px; }
  .rungrueang-warranty-boxes { grid-template-columns: 1fr; }
  
  /* Reset order on tablet/mobile */
  .reverse-grid .rungrueang-service-visual { order: 1; }
  .reverse-grid .rungrueang-service-text { order: 2; }
}

@media (max-width: 768px) {
  .rungrueang-hero-sec, .rungrueang-service-detail, .rungrueang-warranty-sec, .rungrueang-faq-sec {
    padding: 80px 0;
  }
  .rungrueang-hero-title { font-size: 32px; }
  .rungrueang-service-number { font-size: 120px; top: -50px; }
  .rungrueang-deep-detail { padding: 30px 20px; }
  .rungrueang-image-frame { padding: 0 0 20px 20px; }
  .rungrueang-image-frame::before { top: 20px; right: 20px; }
  .rungrueang-image-frame img { height: 400px; }
  
  .rungrueang-w-box { padding: 40px 30px; }
  .rungrueang-w-number { font-size: 60px; }
  
  .rungrueang-accordion-btn { padding: 25px 10px; }
  .rungrueang-q-text { font-size: 18px; padding-right: 20px; }
  .rungrueang-accordion-content { padding: 0 10px; }
}

#backToTop {
  position: fixed;
  bottom: 40px;
  right: 40px;
  display: none;
  background: #3f3f3f;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 45px;
  height: 45px;
  font-size: 22px;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  transition: background 0.3s;
  z-index: 999;
}
#backToTop:hover {
  background: #555;
}