/* ================================
   GLOBAL STYLES & VARIABLES
   ================================ */
:root {
    --color-primary: #007bff;
    --color-primary-dark: #0056b3;
    --color-dark: #222;
    --color-text: #333;
    --color-light: #f9f9f9;
    --color-border: #ddd;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 40px;
    --max-width: 1200px;
    --transition-speed: 0.3s ease;
}

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

html, body {
    height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: #fff;
}

main {
    flex: 1; /* pushes footer down */
}

/* ================================
   ACCESSIBILITY
   ================================ */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background-color: #000;
    color: #fff;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}
.skip-link:focus { top: 0; }
a:focus, button:focus, input:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ================================
   TYPOGRAPHY
   ================================ */
h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: var(--spacing-lg); color: var(--color-dark); }
h2 { font-size: 2rem; font-weight: 600; margin-bottom: var(--spacing-lg); color: var(--color-primary); }
h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: var(--spacing-md); }
h4 { font-size: 1.2rem; font-weight: 500; margin-bottom: var(--spacing-sm); }
p { margin-bottom: var(--spacing-md); line-height: 1.7; }
strong { font-weight: 600; color: var(--color-dark); }

/* ================================
   BUTTONS
   ================================ */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 1rem;
}
.btn-primary {
    background-color: #fff;
    color: var(--color-primary);
    border: 2px solid #fff;
}
.btn-primary:hover, .btn-primary:focus {
    background-color: transparent;
    color: #fff;
}
.btn-secondary {
    background-color: var(--color-primary);
    color: #fff;
}
.btn-secondary:hover, .btn-secondary:focus {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}


/* ================================
   BACK BUTTON 
   ================================ */

.back-button {
  display: inline-block;       /* shrink to content */
  width: 10%;                 /* prevent full-width */
  flex: 0 0 auto;              /* stop flex expansion */
  margin: var(--spacing-md) 0; /* vertical spacing */
  margin-left: var(--spacing-md); /* left margin */
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color var(--transition-speed);
}

.back-button:hover {
  background-color: var(--color-primary-dark);
}

/* ================================
   HERO SECTION
   ================================ */
.hero-image {
    position: relative;
    width: 100%;
    height: 500px;
    background-color: #f0f0f0;
    overflow: hidden;
}
.slideshow {
    position: relative;
    width: 100%;
    height: 100%;
}
.slide {
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0; left: 0;
}
.slide.active {
    display: block;
    animation: fadeIn 0.5s;
}
@keyframes fadeIn { from {opacity:0;} to {opacity:1;} }
.slide img {
    width: 100%;
    height: auto;
    max-height: 100%;
    object-fit: contain;
    display: block;
    margin: 0 auto;
}
.brand-name {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    max-width: 100%;
    color: #fff;
    background: rgba(0,0,0,0.7);
    padding: 10px 20px;
    text-align: center;
    font-size: 1.3rem;
    font-weight: bold;
    border-radius: 4px;
}

/* Optional hero text block (from styles.css) */
.hero-text {
    max-width: 1200px;
    margin: 0 auto 50px auto;
    text-align: center;
    padding: 10px;
}
.hero-text h1 {
    font-size: 3em;
    font-weight: 700;
    margin-bottom: 15px;
    color: #222;
    letter-spacing: 1px;
}
.hero-text h2 {
    font-size: 1.4em;
    font-weight: 500;
    margin-bottom: 5px;
    color: var(--color-primary);
}
.hero-text p {
    font-size: 1.1em;
    margin-bottom: 20px;
    color: #555;
}
.hero-text .btn-secondary {
    padding: 12px 28px;
    transition: background-color 0.3s ease;
}
.hero-text .btn-secondary:hover {
    background-color: var(--color-primary-dark);
}

/* ================================
   CATEGORIES GRID
   ================================ */
.categories {
    padding: var(--spacing-lg) var(--spacing-md);
    background-color: #fff;
    text-align: center;
}
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    justify-items: center;
    align-items: stretch;
}
.category-card {
    background: var(--color-light);
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all var(--transition-speed);
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    max-width: 300px;
}
.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}
.category-card img {
    width: 100%;
    height: 180px;
    object-fit: contain;
    margin-bottom: var(--spacing-md);
    border-radius: 6px;
    background-color: #fff;
}
.category-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}
.category-card p {
    flex-grow: 1;
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

/* ================================
   PRODUCT GRID
   ================================ */

.product-section {
    max-width: var(--max-width);
    margin: var(--spacing-xl) auto;
    padding: 0 var(--spacing-md);
}

.product-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--color-primary);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    justify-items: center;
    align-items: stretch;
}

.product-item {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: center;
    transition: all var(--transition-speed);
    width: 100%;
    max-width: 220px;
    display: flex;
    flex-direction: column;
}

.product-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.product-item img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    margin-bottom: var(--spacing-md);
    border-radius: 4px;
    background-color: var(--color-light);
}

.product-item h3 {
    font-size: 1rem;
    color: var(--color-dark);
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

/* ================================
   ABOUT US SECTION
   ================================ */

.about-us {
    background-color: var(--color-light);
    padding: var(--spacing-xl) var(--spacing-md);
    margin: var(--spacing-xl) auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.about-us h1 {
    text-align: center;
    color: var(--color-primary);
}

.about-us p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.about-us a {
    color: var(--color-primary);
    text-decoration: none;
}

.about-us a:hover, .about-us a:focus {
    text-decoration: underline;
}

/* ================================
   CONTACT US SECTION
   ================================ */

.contact-us {
    background-color: #ffffff;
    padding: var(--spacing-xl) var(--spacing-md);
    margin: var(--spacing-xl) auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.contact-us h1 {
    text-align: center;
    color: var(--color-primary);
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-info {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-md) var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.contact-info dt {
    font-weight: bold;
    color: var(--color-dark);
}

.contact-info dd {
    margin: 0;
    color: var(--color-text);
}

.contact-info a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: bold;
}

.contact-info a:hover, .contact-info a:focus {
    text-decoration: underline;
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

/* Tablet (768px and below) */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    
    .category-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: var(--spacing-md);
    }
    
    .hero-image {
        height: 350px;
    }
    
    .about-us, .contact-us {
        padding: var(--spacing-lg) var(--spacing-md);
        margin: var(--spacing-lg) auto;
    }
}

/* Mobile (576px and below) */
@media (max-width: 576px) {
    :root {
        --spacing-xl: 20px;
        --spacing-lg: 16px;
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.2rem; }
    
    body { font-size: 14px; }
    
    .category-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .product-item {
        padding: var(--spacing-sm);
    }
    
    .product-item img {
        height: 150px;
    }
    
    .hero-image {
        height: 250px;
    }
    
    .brand-name {
        font-size: 1rem;
        padding: 10px;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
}

/* Tablet (768px and below) */
@media (max-width: 768px) {
  .back-button {
    margin-left: var(--spacing-sm);   /* smaller left margin */
    margin-top: var(--spacing-sm);
    font-size: 0.95rem;
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

/* Mobile (576px and below) */
@media (max-width: 576px) {
  .back-button {
    display: block;                   /* full row */
    width: 100%;                      /* button spans full width */
    margin: var(--spacing-sm) 0;      /* vertical spacing only */
    text-align: center;               /* center text inside button */
    font-size: 0.9rem;
    padding: var(--spacing-sm);
  }
}