/* ============================================================
   Hearthstone Renovations — Design System & Component Styles
   
   Color palette: Terracotta, Charcoal, Gold, Cream
   Typography: Playfair Display (headings) + Inter (body)
   Layout: Mobile-first responsive (768px, 1024px breakpoints)
   ============================================================ */

/* ----- CSS Custom Properties (Design Tokens) ----- */
:root {
  /* Colors */
  --color-primary: #C1694F;        /* Warm terracotta — buttons, accents */
  --color-primary-dark: #A3563F;   /* Darker terracotta — hover states */
  --color-text: #2C2C2C;           /* Charcoal — body text */
  --color-text-light: #6B6B6B;     /* Lighter text — captions, meta */
  --color-accent: #D4A853;         /* Soft gold — highlights, ratings */
  --color-bg: #FAF7F2;             /* Warm cream — page background */
  --color-card: #FFFFFF;           /* White — card surfaces */
  --color-hero-overlay: rgba(44, 44, 44, 0.55); /* Dark overlay for hero text */

  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing scale (8px base) */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 1rem;      /* 16px */
  --space-md: 1.5rem;    /* 24px */
  --space-lg: 2rem;      /* 32px */
  --space-xl: 3rem;      /* 48px */
  --space-2xl: 4rem;     /* 64px */
  --space-3xl: 6rem;     /* 96px */

  /* Layout */
  --max-width: 1200px;
  --border-radius: 8px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
}


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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}


/* ----- Utility Classes ----- */

/* Constrains content to max-width with horizontal padding */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Standard section vertical padding */
.section {
  padding: var(--space-3xl) 0;
}

/* Section heading block — centered with underline accent */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: var(--space-xs);
}

/* Gold underline accent beneath section titles */
.section-header .accent-line {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: var(--space-sm) auto 0;
  border-radius: 2px;
}

.section-header p {
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-top: var(--space-sm);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Scroll-triggered fade-in animation class. 
   Elements start invisible and slide up, then get .visible added by JS. */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ----- Navigation ----- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: box-shadow var(--transition-normal);
}

/* Add shadow when page is scrolled (toggled by JS) */
.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Company name in navbar */
.navbar-brand {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Small flame icon next to brand name */
.navbar-brand .brand-icon {
  color: var(--color-primary);
  font-size: 1.5rem;
}

/* Desktop nav link list */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: var(--space-xs) 0;
}

/* Animated underline on hover for nav links */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-normal);
}

.nav-links a:hover::after {
  width: 100%;
}

/* CTA button style (used in nav and hero) */
.btn-primary {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
}

/* Hamburger button — hidden on desktop, shown on mobile */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Animate hamburger into X when menu is open */
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Language toggle button (EN ↔ 中文) — subtle, sits in navbar */
.lang-toggle {
  background: none;
  border: 1.5px solid var(--color-text);
  color: var(--color-text);
  padding: 0.35rem 0.75rem;
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  margin-left: var(--space-sm);
}

.lang-toggle:hover {
  background: var(--color-text);
  color: #fff;
}


/* ----- Hero Section ----- */
.hero {
  /* Push content below fixed navbar */
  margin-top: 72px;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;

  /* Warm gradient background (fallback for when no hero image is added) */
  background: linear-gradient(
    135deg,
    #C1694F 0%,
    #D4A853 50%,
    #C1694F 100%
  );
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
}

/* Subtle animated gradient shift on the hero background */
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* Semi-transparent overlay to ensure text readability on hero */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--color-hero-overlay);
}

/* Hero text content sits above the overlay */
.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  max-width: 700px;
  padding: var(--space-lg);
}

.hero-content h1 {
  font-size: 3.5rem;
  color: #fff;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

/* Tagline text beneath the hero heading */
.hero-content .tagline {
  font-size: 1.3rem;
  opacity: 0.9;
  margin-bottom: var(--space-lg);
  font-weight: 300;
}

/* Hero-specific CTA button (slightly larger) */
.hero .btn-primary {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}


/* ----- About Section ----- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-text h3 {
  font-size: 1.8rem;
  margin-bottom: var(--space-sm);
}

.about-text p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-light);
}

/* Stat counters row (e.g., "15+ years", "200+ projects") */
.about-stats {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.stat {
  text-align: center;
}

.stat .number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--color-primary);
  font-weight: 700;
}

.stat .label {
  font-size: 0.85rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Decorative image placeholder for About section */
.about-image {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--border-radius-lg);
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 4rem;
}


/* ----- Services Section ----- */
.services {
  background: var(--color-card);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* Individual service card with hover lift effect */
.service-card {
  background: var(--color-bg);
  padding: var(--space-lg);
  border-radius: var(--border-radius-lg);
  text-align: center;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

/* Service icon circle */
.service-card .icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-sm);
  font-size: 1.5rem;
  color: #fff;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
}

.service-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}


/* ----- Gallery Section ----- */
.gallery-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

/* Each project card in the gallery */
.project-card {
  background: var(--color-card);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.project-card:hover {
  box-shadow: var(--shadow-lg);
}

/* Grid of images within a single project card */
.project-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}

/* Gallery image placeholders — clickable for lightbox */
.project-images .gallery-img {
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  cursor: pointer;
  transition: opacity var(--transition-fast);
  overflow: hidden;
}

.project-images .gallery-img:hover {
  opacity: 0.85;
}

.project-images .gallery-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Text content below the project images */
.project-info {
  padding: var(--space-md);
}

.project-info h3 {
  font-size: 1.3rem;
  margin-bottom: var(--space-xs);
}

.project-info p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}


/* ----- Lightbox (full-screen image viewer) ----- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox img {
  max-width: 90%;
  max-height: 90vh;
  border-radius: var(--border-radius);
}

/* Close button for lightbox */
.lightbox-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.lightbox-close:hover {
  transform: scale(1.2);
}


/* ----- Testimonials Section ----- */
.testimonials {
  background: var(--color-card);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* Individual testimonial card */
.testimonial-card {
  background: var(--color-bg);
  padding: var(--space-lg);
  border-radius: var(--border-radius-lg);
  position: relative;
}

/* Large decorative opening quote mark */
.testimonial-card .quote-mark {
  font-family: var(--font-heading);
  font-size: 4rem;
  color: var(--color-accent);
  line-height: 1;
  opacity: 0.4;
  position: absolute;
  top: var(--space-sm);
  left: var(--space-md);
}

.testimonial-card p {
  font-style: italic;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
  padding-top: var(--space-lg);
}

/* Star rating row (gold stars via accent color) */
.testimonial-card .stars {
  color: var(--color-accent);
  font-size: 1.1rem;
  margin-bottom: var(--space-xs);
}

.testimonial-card .author {
  font-weight: 600;
  font-size: 0.9rem;
}

/* Link to Google Reviews below testimonials */
.google-reviews-link {
  text-align: center;
  margin-top: var(--space-xl);
}

.google-reviews-link a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-primary);
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.google-reviews-link a:hover {
  background: var(--color-primary);
  color: #fff;
}


/* ----- Contact Section ----- */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-content p {
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
  font-size: 1.1rem;
}

/* Contact method cards (phone, email) */
.contact-methods {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.contact-method {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

/* Circular icon container for contact methods */
.contact-method .icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #fff;
}

.contact-method .label {
  font-size: 0.85rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-method .value {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
}

.contact-method .value a {
  color: var(--color-text);
}

.contact-method .value a:hover {
  color: var(--color-primary);
}


/* ----- Footer ----- */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-xl) 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer .brand {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: #fff;
  font-weight: 700;
}

.footer p {
  font-size: 0.9rem;
}

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

.footer a:hover {
  color: #fff;
}


/* ============================================================
   Responsive Breakpoints
   ============================================================ */

/* ---- Tablet (< 1024px) ---- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-content h1 {
    font-size: 2.8rem;
  }
}

/* ---- Mobile (< 768px) ---- */
@media (max-width: 768px) {
  /* Show hamburger, hide desktop nav links */
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    pointer-events: none;
  }

  /* Mobile menu open state (toggled by JS) */
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .hero-content h1 {
    font-size: 2.2rem;
  }

  .hero-content .tagline {
    font-size: 1.1rem;
  }

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

  .about-image {
    height: 250px;
  }

  .about-stats {
    justify-content: center;
  }

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

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

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

  .section-header h2 {
    font-size: 2rem;
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .contact-methods {
    flex-direction: column;
    align-items: center;
  }
}