/* ========================================
   MYS – Vòng Tay Đá Phong Thủy
   CSS Design System
   ======================================== */

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --gold:       #c9a84c;
  --gold-light: #e8c97a;
  --gold-dark:  #9a7535;
  --dark:       #0d0b0a;
  --dark-2:     #161310;
  --dark-3:     #201c18;
  --dark-4:     #2a2420;
  --cream:      #f5f0e8;
  --cream-2:    #ede6d8;
  --text:       #d4c9b5;
  --text-muted: #8a7f6f;
  --white:      #ffffff;

  --font-display: 'Outfit', sans-serif;
  --font-body:    'Inter', sans-serif;

  --radius:   12px;
  --radius-lg: 20px;
  --shadow:   0 8px 32px rgba(0,0,0,.45);
  --shadow-card: 0 4px 24px rgba(0,0,0,.35);
  --transition: .35s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 100px 0; }

/* ---- Scroll Reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .08em;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn--gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-light), var(--gold));
  background-size: 200% auto;
  color: var(--dark);
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(201,168,76,.35);
}
.btn--gold:hover {
  background-position: right center;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(201,168,76,.5);
}
.btn--outline {
  background: transparent;
  border: 1.5px solid var(--gold);
  color: var(--gold);
}
.btn--outline:hover {
  background: rgba(201,168,76,.1);
  transform: translateY(-2px);
}
.btn--sm { padding: 10px 22px; font-size: .82rem; }
.btn--full { width: 100%; justify-content: center; }

/* ---- Section Common ---- */
.section__tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}
.section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  color: var(--cream);
  line-height: 1.2;
  margin-bottom: 18px;
}
.section__desc {
  color: var(--text-muted);
  max-width: 560px;
  font-size: .95rem;
}
.section__header { text-align: center; margin-bottom: 60px; }
.section__header .section__desc { margin: 0 auto; }

/* ===========================
   NAV
   =========================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(13,11,10,.92);
  backdrop-filter: blur(16px);
  box-shadow: 0 2px 20px rgba(0,0,0,.4);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo-img {
  height: 48px;
  width: auto;
  filter: brightness(0) invert(1);
  transition: opacity var(--transition);
}
.nav__logo-img:hover { opacity: .8; }
.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__links a {
  font-size: .85rem;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--text);
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--gold); }
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--cream);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===========================
   HERO
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: url('image/banner_light.png') center/cover no-repeat;
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.45);
}
.hero__particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__particles span {
  position: absolute;
  width: 2px; height: 2px;
  background: var(--gold);
  border-radius: 50%;
  opacity: 0;
  animation: twinkle var(--dur, 4s) var(--delay, 0s) infinite;
}
@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(.5); }
  50%       { opacity: .8; transform: scale(1.5); }
}
.hero__content {
  position: relative;
  z-index: 2;
  padding-top: 120px;
  padding-bottom: 80px;
}
.hero__eyebrow {
  font-size: .78rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--dark-3);
  font-weight: 600;
  margin-bottom: 20px;
  transition-delay: .1s;
}
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 300;
  line-height: 1.05;
  color: var(--dark);
  margin-bottom: 28px;
  transition-delay: .2s;
}
.hero__title em {
  font-style: italic;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__sub {
  max-width: 520px;
  font-size: 1.05rem;
  color: var(--dark-2);
  font-weight: 500;
  margin-bottom: 44px;
  transition-delay: .3s;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  transition-delay: .4s;
}
.hero__scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.hero__scroll span {
  display: block;
  width: 24px; height: 38px;
  border: 2px solid rgba(0,0,0,.4);
  border-radius: 12px;
  position: relative;
}
.hero__scroll span::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--dark);
  border-radius: 2px;
  animation: scrollDown 1.8s ease infinite;
}
@keyframes scrollDown {
  0%   { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(14px); }
}

/* ===========================
   ABOUT
   =========================== */
.about { background: var(--dark-2); }
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about__images {
  position: relative;
  height: 520px;
}
.about__img-main {
  position: absolute;
  top: 0; left: 0;
  width: 78%;
  height: 90%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.about__img-main img { width: 100%; height: 100%; object-fit: cover; }
.about__img-float {
  position: absolute;
  bottom: 0; right: 0;
  width: 48%;
  height: 56%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 3px solid var(--dark-2);
}
.about__img-float img { width: 100%; height: 100%; object-fit: cover; }
.about__text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: .95rem;
}
.about__text strong { color: var(--cream); }
.about__text em { color: var(--gold); font-style: normal; }
.about__stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  padding-top: 32px;
  border-top: 1px solid rgba(201,168,76,.15);
}
.stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 300;
  color: var(--gold);
  line-height: 1;
}
.stat__label {
  display: block;
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===========================
   BENEFITS
   =========================== */
.benefits { background: var(--dark); }
.benefits__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.benefit-card {
  background: var(--dark-3);
  border: 1px solid rgba(201,168,76,.12);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.benefit-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(201,168,76,.06), transparent);
  opacity: 0;
  transition: var(--transition);
}
.benefit-card:hover {
  transform: translateY(-8px);
  border-color: rgba(201,168,76,.3);
  box-shadow: 0 20px 50px rgba(0,0,0,.4);
}
.benefit-card:hover::before { opacity: 1; }
.benefit-card__icon {
  font-size: 2.4rem;
  margin-bottom: 20px;
  display: block;
}
.benefit-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--cream);
  margin-bottom: 12px;
}
.benefit-card p {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===========================
   COLLECTION
   =========================== */
.collection { background: var(--dark-2); }
.collection__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: var(--dark-3);
  border: 1px solid rgba(201,168,76,.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.product-card:hover {
  transform: translateY(-8px);
  border-color: rgba(201,168,76,.3);
  box-shadow: 0 20px 50px rgba(0,0,0,.5);
}
.product-card__img {
  position: relative;
  height: 240px;
  overflow: hidden;
}
.product-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.product-card:hover .product-card__img img { transform: scale(1.08); }
.product-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(13,11,10,.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.product-card__overlay span {
  color: var(--gold);
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  border: 1px solid var(--gold);
  padding: 8px 20px;
  border-radius: 50px;
}
.product-card:hover .product-card__overlay { opacity: 1; }
.product-card__body { padding: 22px 20px 24px; }
.product-card__tag {
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
  display: block;
}
.product-card__body h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--cream);
  margin-bottom: 8px;
}
.product-card__price {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 12px;
}
.product-card__body p {
  font-size: .84rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.6;
}

/* ===========================
   MENH (Ngũ Hành)
   =========================== */
.menh { background: var(--dark); }
.menh__tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}
.menh__tab {
  background: var(--dark-3);
  border: 1.5px solid rgba(201,168,76,.2);
  color: var(--text-muted);
  padding: 10px 24px;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: .85rem;
  cursor: pointer;
  transition: var(--transition);
}
.menh__tab:hover {
  border-color: var(--gold);
  color: var(--gold);
}
.menh__tab.active {
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  border-color: var(--gold);
  color: var(--dark);
  font-weight: 600;
}
.menh__panel { display: none; }
.menh__panel.active { display: block; }
.menh__panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  background: var(--dark-3);
  border: 1px solid rgba(201,168,76,.15);
  border-radius: var(--radius-lg);
  padding: 50px;
}
.menh__info h3 {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 300;
  color: var(--cream);
  margin-bottom: 14px;
}
.menh__desc {
  color: var(--text-muted);
  font-size: .93rem;
  margin-bottom: 24px;
}
.menh__colors {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  font-size: .85rem;
  color: var(--text-muted);
}
.color-dot {
  width: 22px; height: 22px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.menh__stones {
  margin-bottom: 24px;
}
.menh__stones li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(201,168,76,.08);
  font-size: .9rem;
  color: var(--text);
}
.menh__stones li:last-child { border-bottom: none; }
.menh__stones strong { color: var(--gold); }
.menh__effect {
  font-size: .88rem;
  color: var(--gold);
  font-style: italic;
}
/* Menh visual placeholder gradient */
.menh__visual {
  height: 340px;
  border-radius: var(--radius-lg);
  background-size: cover;
  background-position: center;
}
.kim-visual  { background: linear-gradient(135deg, #c0c0c0 0%, #8a7535 50%, #f5f0e8 100%); }
.moc-visual  { background-image: url('image/M3.jpg'); background-size: cover; }
.thuy-visual { background-image: url('image/M2.jpg'); background-size: cover; }
.hoa-visual  { background-image: url('image/M1.jpg'); background-size: cover; }
.tho-visual  { background-image: url('image/M4.jpeg'); background-size: cover; }

/* ===========================
   BANNER CTA
   =========================== */
.banner {
  background:
    radial-gradient(ellipse 80% 100% at 50% 50%, rgba(201,168,76,.12) 0%, transparent 70%),
    var(--dark-2);
  padding: 100px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.banner::before {
  content: '✦';
  position: absolute;
  font-size: 18rem;
  color: rgba(201,168,76,.03);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.banner__inner h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 300;
  color: var(--cream);
  margin-bottom: 36px;
  line-height: 1.25;
}
.banner__inner h2 em {
  font-style: italic;
  color: var(--gold);
}

/* ===========================
   CONTACT
   =========================== */
.contact { background: var(--dark); }
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}
.contact__text p {
  color: var(--text-muted);
  margin-bottom: 36px;
}
.contact__info { display: flex; flex-direction: column; gap: 18px; }
.contact__info-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: .9rem;
  color: var(--text);
}
.contact__icon { font-size: 1.2rem; }
.contact__form {
  background: var(--dark-3);
  border: 1px solid rgba(201,168,76,.12);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label {
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.form-group input,
.form-group select,
.form-group textarea {
  background: var(--dark-4);
  border: 1.5px solid rgba(201,168,76,.15);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: .92rem;
  color: var(--cream);
  outline: none;
  transition: border-color var(--transition);
  resize: vertical;
  appearance: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201,168,76,.1);
}
.form-group select option { background: var(--dark-4); }
.form__success {
  display: none;
  text-align: center;
  color: #6fcf97;
  font-size: .9rem;
  padding: 12px;
  background: rgba(111,207,151,.08);
  border-radius: var(--radius);
  border: 1px solid rgba(111,207,151,.2);
}

/* ===========================
   FOOTER
   =========================== */
.footer {
  background: var(--dark-2);
  border-top: 1px solid rgba(201,168,76,.1);
  padding: 50px 0 30px;
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  text-align: center;
}
.footer__logo img {
  height: 56px;
  margin: 0 auto 10px;
  filter: brightness(0) invert(1);
  opacity: .7;
}
.footer__logo p {
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}
.footer__links a {
  font-size: .83rem;
  color: var(--text-muted);
  transition: color var(--transition);
  letter-spacing: .06em;
}
.footer__links a:hover { color: var(--gold); }
.footer__copy {
  font-size: .75rem;
  color: var(--text-muted);
  opacity: .6;
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
  .benefits__grid { grid-template-columns: repeat(2, 1fr); }
  .collection__grid { grid-template-columns: repeat(2, 1fr); }
  .about__grid { gap: 50px; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: 75vw;
    background: rgba(13,11,10,.97);
    backdrop-filter: blur(20px);
    padding: 100px 40px 40px;
    gap: 28px;
    font-size: 1.1rem;
    box-shadow: -10px 0 40px rgba(0,0,0,.5);
    z-index: 999;
  }

  .about__grid { grid-template-columns: 1fr; }
  .about__images { height: 340px; }
  .menh__panel-grid { grid-template-columns: 1fr; }
  .menh__visual { height: 220px; }
  .contact__grid { grid-template-columns: 1fr; }
  .hero__title { font-size: clamp(2.5rem, 12vw, 4rem); }
}

@media (max-width: 540px) {
  .benefits__grid { grid-template-columns: 1fr; }
  .collection__grid { grid-template-columns: 1fr; }
  .hero__cta { flex-direction: column; }
  .about__stats { flex-direction: column; gap: 16px; }
  .menh__tabs { gap: 8px; }
  .menh__tab { font-size: .78rem; padding: 8px 16px; }
  .menh__panel-grid { padding: 28px 20px; gap: 30px; }
  .contact__form { padding: 24px 20px; }
}