/* Quoc Khanh Limited - Minimal Pink & Black Theme */
:root {
  --pink: #E91E63;
  --pink-light: #F8BBD9;
  --pink-soft: #FCE4EC;
  --black: #111111;
  --gray-900: #1a1a1a;
  --gray-700: #333333;
  --gray-500: #666666;
  --gray-300: #cccccc;
  --gray-100: #f5f5f5;
  --white: #ffffff;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
  font-size: 16px;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ========== HEADER ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
  padding: 0 1.5rem;
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--black);
}

.logo span {
  color: var(--pink);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--pink);
}

.nav-cta {
  background: var(--pink);
  color: var(--white) !important;
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
  font-weight: 600;
}

.nav-cta:hover {
  background: #c2185b;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  margin: 5px 0;
  transition: 0.3s;
}

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, var(--black) 0%, #1f1f1f 100%);
  color: var(--white);
  padding: 5rem 1.5rem 6rem;
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: rgba(233, 30, 99, 0.2);
  color: var(--pink-light);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  border-radius: 50px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero h1 span {
  color: var(--pink);
}

.hero p {
  font-size: 1.15rem;
  color: var(--gray-300);
  margin-bottom: 2.5rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--pink);
  color: var(--white);
}

.btn-primary:hover {
  background: #c2185b;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
  border-color: var(--pink);
  color: var(--pink);
}

/* ========== SECTIONS ========== */
.section {
  padding: 5rem 1.5rem;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 3.5rem;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--gray-500);
  font-size: 1.05rem;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* ========== FEATURED PRODUCTS (Home) ========== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.25s;
}

.product-card:hover {
  border-color: var(--pink-light);
  box-shadow: 0 12px 30px rgba(233, 30, 99, 0.08);
  transform: translateY(-4px);
}

.product-image {
  height: 200px;
  background: var(--pink-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.product-image .icon {
  width: 80px;
  height: 80px;
  opacity: 0.9;
}

.product-body {
  padding: 1.5rem;
}

.product-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.product-body p {
  color: var(--gray-500);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.product-link {
  color: var(--pink);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.product-link:hover {
  text-decoration: underline;
}

/* ========== ABOUT ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.about-text p {
  color: var(--gray-500);
  margin-bottom: 1.25rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--pink);
  display: block;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

.about-card {
  background: var(--black);
  color: var(--white);
  border-radius: 16px;
  padding: 2.5rem;
}

.about-card h3 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--pink);
}

.about-card ul {
  list-style: none;
}

.about-card li {
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.about-card li:last-child {
  border-bottom: none;
}

.about-card li::before {
  content: "✓";
  color: var(--pink);
  font-weight: 700;
  flex-shrink: 0;
}

/* ========== VALUES ========== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.value-card {
  background: var(--gray-100);
  border-radius: 12px;
  padding: 1.75rem;
  text-align: center;
}

.value-icon {
  width: 48px;
  height: 48px;
  background: var(--pink-soft);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  color: var(--pink);
  font-size: 1.4rem;
}

.value-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.value-card p {
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* ========== PRODUCTS PAGE ========== */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 4rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--gray-100);
}

.product-detail:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.product-detail.reverse {
  direction: rtl;
}

.product-detail.reverse > * {
  direction: ltr;
}

.product-visual {
  background: var(--pink-soft);
  border-radius: 16px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-visual .icon {
  width: 120px;
  height: 120px;
}

.product-info h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.product-info p {
  color: var(--gray-500);
  margin-bottom: 1.5rem;
}

.product-features {
  list-style: none;
  margin-bottom: 1.75rem;
}

.product-features li {
  padding: 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
}

.product-features li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--pink);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ========== CONTACT ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 3.5rem;
}

.contact-info h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.contact-info > p {
  color: var(--gray-500);
  margin-bottom: 2rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: var(--pink-soft);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pink);
  flex-shrink: 0;
  font-size: 1.1rem;
}

.contact-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.contact-item p,
.contact-item a {
  color: var(--gray-500);
  font-size: 0.95rem;
}

.contact-item a:hover {
  color: var(--pink);
}

.contact-form {
  background: var(--gray-100);
  border-radius: 16px;
  padding: 2.25rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--gray-700);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--white);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--pink);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-success {
  display: none;
  background: #e8f5e9;
  color: #2e7d32;
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  text-align: center;
  font-weight: 500;
}

/* ========== FOOTER ========== */
.footer {
  background: var(--black);
  color: var(--gray-300);
  padding: 3.5rem 1.5rem 2rem;
}

.footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .logo {
  color: var(--white);
  margin-bottom: 1rem;
  display: inline-block;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 280px;
}

.footer h4 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

.footer ul {
  list-style: none;
}

.footer li {
  margin-bottom: 0.6rem;
}

.footer a {
  color: var(--gray-300);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--pink);
}

.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

/* ========== CTA BANNER ========== */
.cta-banner {
  background: var(--pink);
  color: var(--white);
  text-align: center;
  padding: 4rem 1.5rem;
}

.cta-banner h2 {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.cta-banner p {
  opacity: 0.9;
  margin-bottom: 1.75rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner .btn {
  background: var(--white);
  color: var(--pink);
}

.cta-banner .btn:hover {
  background: var(--pink-soft);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
  .about-grid,
  .contact-grid,
  .product-detail {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .product-detail.reverse {
    direction: ltr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 700px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--gray-100);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
  }

  .nav-links.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    padding: 4rem 1.5rem 5rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* Page header for inner pages */
.page-header {
  background: var(--black);
  color: var(--white);
  padding: 3.5rem 1.5rem;
  text-align: center;
}

.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--gray-300);
  font-size: 1.05rem;
}