/* ===========================================
   Weltkit - Premium Diesel Components
   Version: 2.0.0 | Last Updated: 2025-09-12
   Theme: Single Page Modern Layout
============================================ */

/* 1. GLOBAL VARIABLES */
:root {
  /* Colors - Elegant Red & Black Theme */
  --primary: #C62828;       /* Deep, rich red (slightly brighter) */
  --primary-light: #FF5F52; /* Softer red for accents */
  --primary-dark: #8E0000;  /* Darker red for hover states */
  
  --secondary: #1A1A1A;     /* Soft black */
  --secondary-light: #333333;
  --secondary-dark: #000000;
  
  --accent: #E53935;        /* Vibrant red for highlights */
  --accent-light: #FF6E60;
  --accent-dark: #AB000D;
  
  /* Neutral colors */
  --white: #ffffff;
  --off-white: #f5f5f5;
  --gray-light: #e0e0e0;
  --gray: #9e9e9e;
  --gray-dark: #424242;
  --black: #121212;
  
  /* Backgrounds */
  --background: #FAFAFA;
  --card-bg: #FFFFFF;
  --footer-bg: #0A0A0A;
  --section-bg: #FFFFFF;
  --section-alt-bg: #F5F5F5;
  
  /* Typography */
  --font-primary: 'Montserrat', sans-serif;
  --font-secondary: 'Open Sans', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Border radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* 2. BASE STYLES */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100%;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--gray-dark);
  background-color: var(--background);
  padding-top: 70px; /* Match header height */
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  position: relative;
  z-index: 2;
}

/* Section Styling */
section {
  padding: 8rem 0;
  position: relative;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  background-color: var(--section-bg);
  overflow: hidden;
}

section:not(:last-child) {
  margin-bottom: 0;
}

/* Alternate section background */
section:nth-child(even), .bg-alt {
  background-color: var(--section-alt-bg);
  position: relative;
}

/* Gradient accent for section dividers */
section:not(:first-child)::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0.1;
}

/* Hero section specific */
.hero {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
  color: #FFFFFF;
  position: relative;
  padding: 14rem 0 10rem;
  margin-top: -70px; /* Offset the fixed header */
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0% 100%);
  margin-bottom: -6rem;
  z-index: 1;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.hero h1 {
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero p {
  color: rgba(255,255,255,0.9);
  max-width: 700px;
  margin: 0 auto 2.5rem;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiPjxkZWZzPjxwYXR0ZXJuIGlkPSJwYXR0ZXJuIiB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHBhdHRlcm5UcmFuc2Zvcm09InJvdGF0ZSg0NSkiPjxyZWN0IHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0icmdiYSgwLDAsMCwwLjAxKSIvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0idXJsKCNwYXR0ZXJuKSIvPjwvc3ZnPg==') center/cover no-repeat;
  opacity: 0.3;
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
}

/* Footer styling */
.footer {
  background: var(--footer-bg);
  color: rgba(255, 255, 255, 0.9);
  padding: 12rem 0 4rem;
  position: relative;
  clip-path: polygon(0 8%, 100% 0, 100% 100%, 0 100%);
  margin-top: -4rem;
  z-index: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.2);
}

.footer a {
  color: rgba(255,255,255,0.8);
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--primary-light);
  text-decoration: none;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  z-index: 1;
}

/* Smooth transition between sections */
section + section {
  margin-top: 0;
  padding-top: 0;
}

/* Add subtle pattern to alternate sections */
section:nth-child(even)::after, .bg-alt::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiPjxkZWZzPjxwYXR0ZXJuIGlkPSJwYXR0ZXJuIiB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHBhdHRlcm5UcmFuc2Zvcm09InJvdGF0ZSg0NSkiPjxyZWN0IHg9IjAiIHk9IjAiIHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0icmdiYSgwLDAsMCwwLjAyKSIvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0idXJsKCNwYXR0ZXJuKSIvPjwvc3ZnPg==') center/cover no-repeat;
  opacity: 0.3;
  pointer-events: none;
}

/* Add gradient overlay to footer */
.footer::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(26,26,26,0.95) 0%, rgba(13,13,13,0.95) 100%);
  z-index: 0;
}

.footer .container {
  position: relative;
  z-index: 1;
}

/* Ensure content flows smoothly into the footer */
.contact-section {
  position: relative;
  z-index: 2;
  background: var(--white);
  padding-bottom: 8rem;
  margin-bottom: -4rem;
}

.contact-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4rem;
  background: linear-gradient(to bottom, var(--white) 0%, rgba(255,255,255,0) 100%);
  z-index: 1;
  pointer-events: none;
}

section h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--gray-dark);
  position: relative;
  padding-bottom: 1rem;
}

section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
}

:target {
  scroll-margin-top: 90px; /* Account for fixed header */
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--gray-dark);
}

h1 {
  font-size: 3.5rem;
  font-weight: 800;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary);
}

p {
  margin-bottom: 1.5rem;
  color: var(--gray);
  font-size: 1.1rem;
  line-height: 1.7;
}

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

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

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

section h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--gray-dark);
  position: relative;
  padding-bottom: 1rem;
}

section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
}

:target {
  scroll-margin-top: 90px; /* Account for fixed header */
}

/* Responsive Design */
@media (max-width: 1200px) {
  html {
    font-size: 15px;
  }
}

@media (max-width: 992px) {
  section {
    padding: 5rem 0;
  }
}

@media (max-width: 768px) {
  .hero {
    text-align: center;
    padding: 0 1rem;
    padding-top: 140px;
  }
}

@media (max-width: 576px) {
  h2 {
    font-size: 2rem;
  }
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: var(--red);
    border-radius: 2px;
}

/* Base defaults to keep desktop tidy */
.mobile-menu-overlay { display: none; }
.main-nav i { display: none; }

/* Responsive Styles (mobile) */
@media (max-width: 767px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        padding: 1.5rem 1rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        pointer-events: none;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
        z-index: 999;
        -webkit-overflow-scrolling: touch;
        will-change: transform, opacity;
    }
    
    .main-nav::before {
        content: '';
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        height: 1px;
        background: linear-gradient(90deg, transparent, rgba(0,0,0,0.1), transparent);
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .main-nav.active::before {
        opacity: 1;
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    /* Add a subtle overlay when menu is open */
    .mobile-menu-overlay {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 998;
    }
    
    .mobile-menu-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
        padding: 0.5rem 0;
    }
    
    .main-nav a {
        padding: 0.75rem 1rem;
        display: flex;
        align-items: center;
        border-radius: 6px;
        transition: all 0.2s ease;
    }
    
    .main-nav a:hover,
    .main-nav a:focus,
    .main-nav a.active {
        background: rgba(230, 0, 0, 0.05);
        color: var(--red);
        transform: translateX(4px);
    }
    
    .main-nav a::before {
        content: '';
        display: inline-block;
        width: 6px;
        height: 6px;
        background: var(--red);
        border-radius: 50%;
        margin-right: 12px;
        opacity: 0;
        transform: translateX(-8px);
        transition: all 0.3s ease;
    }
    
    .main-nav a:hover::before,
    .main-nav a:focus::before,
    .main-nav a.active::before {
        opacity: 1;
        transform: translateX(0);
    }
    
    .main-nav a.active::after {
        display: none;
    }
}

/* Base mobile styles (<=767px) */
@media (max-width: 767px) {
    /* Header & Navigation */
    .header {
        height: auto;
        min-height: 70px;
        padding: 0.5rem 0;
    }
    
    .header-container {
        flex-wrap: wrap;
        padding: 0.5rem var(--spacing);
    }
    
    .logo {
        font-size: 1.5rem;
        margin-right: auto;
    }
    
    .mobile-menu-btn {
        order: 2;
    }
    
    .main-nav {
        order: 3;
        flex: 0 0 100%;
        margin-top: 0.5rem;
    }
    
    .main-menu {
        flex-direction: column;
        width: 100%;
        gap: 0.25rem;
    }
    
    .menu-item {
        width: 100%;
        text-align: left;
    }
    
    .menu-item a {
        padding: 1rem 1.25rem;
        font-size: 1.1rem;
        border-radius: 6px;
    }
    
    /* Hero Section */
    .hero {
        padding: 6rem 1rem 3rem;
        min-height: 70vh;
    }
    
    .hero h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    /* Layout Adjustments */
    .features-grid,
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .product-card {
        margin-bottom: 2rem;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-text,
    .about-image {
        width: 100%;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        margin: 1.5rem 0;
    }
    
    /* Typography Adjustments */
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    /* Buttons */
    .button {
        display: block;
        width: 100%;
        margin-bottom: 0.75rem;
    }
    
    .button + .button {
        margin-left: 0;
    }
}

/* Tablet Styles (768px - 1023px) */
@media (min-width: 768px) and (max-width: 991px) {
    .hero {
        padding: 9rem 2rem 5rem;
    }
    
    .features-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        padding: 0 2rem;
    }
    .features-grid,
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .about-content {
        gap: 2rem;
    }
    
    .about-text,
    .about-image {
        flex: 1;
    }
}

/* Tablet and up (>=768px): ensure inline nav, hide hamburger, remove overlay/dots */
@media (min-width: 768px) {
  .mobile-menu-btn { display: none !important; }
  .main-nav {
    position: static !important;
    transform: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
    background: transparent !important;
    box-shadow: none !important;
    max-height: none !important;
    overflow: visible !important;
  }
  .main-nav ul { flex-direction: row !important; gap: 1.25rem; align-items: center; }
  .main-nav i { display: none !important; }
  .main-nav a { padding: 0.5rem 0.75rem !important; background: transparent !important; }
  .main-nav a::before { content: none !important; }
  .mobile-menu-overlay { display: none !important; opacity: 0 !important; visibility: hidden !important; }
}

/* Desktop overrides to guarantee clean layout */
@media (min-width: 992px) {
  /* Hide hamburger on desktop */
  .mobile-menu-btn { display: none !important; }

  /* Ensure nav is inline and visible */
  .main-nav {
    position: static !important;
    transform: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
    background: transparent !important;
    box-shadow: none !important;
    max-height: none !important;
    overflow: visible !important;
  }

  .main-nav ul { flex-direction: row !important; gap: 1.25rem; }

  /* Clean desktop nav appearance */
  .main-nav i { display: none !important; }
  .main-nav a {
    padding: 0.5rem 0.75rem !important;
    background: transparent !important;
  }
  .main-nav a:hover,
  .main-nav a.active {
    background: var(--background) !important;
    color: var(--red) !important;
  }

  /* Remove mobile dot indicators */
  .main-nav a::before { content: none !important; }

  /* Never show overlay on desktop */
  .mobile-menu-overlay { display: none !important; opacity: 0 !important; visibility: hidden !important; }
}

.grid { display: grid; }
.hidden { display: none; }