/* ==========================================================================
   ZHIYUANTONG (zytliving.com) - Core Production Stylesheet
   Modern B2B Sourcing + Boutique Procurement Partner
   ========================================================================== */

/* 1. CSS Variables & Design Tokens */
:root {
  --color-primary: #183C3A;
  --color-primary-hover: #122E2D;
  --color-primary-light: #244F4C;
  --color-primary-surface: #DCE5DF;
  
  --color-accent-terracotta: #BD8064;
  --color-accent-surface: #F5EBE6;
  
  --color-bg-warm: #F5F3EC;
  --color-bg-pure: #FFFFFF;
  --color-bg-card: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  
  --color-text-primary: #263238;
  --color-text-secondary: #546E7A;
  --color-text-tertiary: #90A4AE;
  --color-text-inverse: #FFFFFF;
  
  --color-border-subtle: #E2E8F0;
  --color-border-input: #CBD5E1;
  --color-border-focus: #183C3A;
  
  --color-status-success: #2E7D32;
  --color-status-error: #D32F2F;
  
  --font-sans: 'Inter', 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 3px rgba(24, 60, 58, 0.06), 0 1px 2px rgba(24, 60, 58, 0.04);
  --shadow-md: 0 4px 14px rgba(24, 60, 58, 0.08);
  --shadow-lg: 0 12px 28px -4px rgba(24, 60, 58, 0.12);
  
  --container-max: 1200px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* 2. Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-warm);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--color-bg-warm);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, select, textarea {
  font: inherit;
}

/* 3. Typography Utility Classes */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.text-display {
  font-size: clamp(2rem, 4vw + 1rem, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-primary);
}

.text-h1 {
  font-size: clamp(1.75rem, 3vw + 1rem, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
}

.text-h2 {
  font-size: clamp(1.35rem, 2vw + 1rem, 1.75rem);
  font-weight: 600;
  line-height: 1.3;
}

.text-h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
}

.text-lead {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.text-muted {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.text-caption {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

/* 4. Layout & Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.section-sm {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.section-alt {
  background-color: var(--color-bg-pure);
}

.section-dark {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.section-dark h1, .section-dark h2, .section-dark h3 {
  color: var(--color-text-inverse);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem auto;
}

.section-header .badge {
  margin-bottom: 1rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

/* 5. UI Components & Tokens */

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: var(--color-accent-surface);
  color: var(--color-accent-terracotta);
  border: 1px solid rgba(189, 128, 100, 0.25);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-sage {
  background-color: var(--color-primary-surface);
  color: var(--color-primary);
  border-color: rgba(24, 60, 58, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary-surface);
  border-color: var(--color-primary);
}

.btn-white {
  background-color: #FFFFFF;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  background-color: var(--color-bg-warm);
  transform: translateY(-1px);
}

.btn-terracotta {
  background-color: var(--color-accent-terracotta);
  color: #FFFFFF;
}

.btn-terracotta:hover {
  background-color: #A66C52;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

/* Cards */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: rgba(24, 60, 58, 0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-surface);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--color-text-primary);
}

.form-label .required {
  color: var(--color-status-error);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  border: 1px solid var(--color-border-input);
  border-radius: var(--radius-md);
  background-color: #FFFFFF;
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(24, 60, 58, 0.15);
}

.form-control::placeholder {
  color: var(--color-text-tertiary);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

.dropzone {
  border: 2px dashed var(--color-border-input);
  border-radius: var(--radius-md);
  padding: 1.75rem 1rem;
  text-align: center;
  background-color: var(--color-bg-alt);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-surface);
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(245, 243, 236, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all var(--transition-normal);
}

.header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-primary);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-primary);
  cursor: pointer;
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Hero Section */
.hero-section {
  padding-top: 4rem;
  padding-bottom: 5rem;
  background: linear-gradient(180deg, var(--color-bg-warm) 0%, rgba(220, 229, 223, 0.4) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.hero-content h1 {
  margin-top: 1rem;
  margin-bottom: 1.25rem;
}

.hero-content .lead {
  margin-bottom: 2rem;
  font-size: 1.125rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.trust-bullets {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-subtle);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.trust-item svg {
  color: var(--color-status-success);
}

.hero-visual {
  position: relative;
}

.hero-card-main {
  background: #FFFFFF;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}

/* Stepper / Timeline */
.steps-wrapper {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
  position: relative;
}

.step-card {
  background: var(--color-bg-pure);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.25rem;
  position: relative;
}

.step-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-accent-terracotta);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step-checkpoint {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-border-subtle);
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* Footer */
.footer {
  background-color: #122E2D;
  color: #E2E8F0;
  padding-top: 4rem;
  padding-bottom: 2rem;
  font-size: 0.875rem;
}

.footer h4 {
  color: #FFFFFF;
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.625rem;
}

.footer-links a {
  color: #94A3B8;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #64748B;
  font-size: 0.8125rem;
}

/* Sticky Contact Bubble */
.sticky-contact-bubble {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.bubble-btn {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  color: #FFFFFF;
  transition: transform var(--transition-fast);
}

.bubble-btn:hover {
  transform: scale(1.08);
}

.bubble-whatsapp {
  background-color: #25D366;
}

.bubble-quote {
  background-color: var(--color-primary);
}

/* Toast Notification */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
}

.toast {
  background: #FFFFFF;
  border-left: 4px solid var(--color-status-success);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 300px;
  animation: slideIn 0.3s ease forwards;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Responsive Rules */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-wrapper {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    flex-direction: column;
    padding: 2rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-lg);
    display: none;
    border-bottom: 1px solid var(--color-border-subtle);
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .steps-wrapper {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  .section {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }
}