/* 
==============================================
   HeavyUsedParts - Main Stylesheet (Redesign)
==============================================
*/

/* 1. Design System: Variables
---------------------------------------------- */
:root {
    /* Color Palette */
    --color-primary: #ffc107; /* A strong, confident yellow */
    --color-primary-dark: #e0a800;
    --color-secondary: #343a40; /* Dark charcoal for text and secondary elements */
    --color-light: #f8f9fa;   /* Off-white for page backgrounds */
    --color-white: #ffffff;
    --color-gray: #6c757d;    /* Muted gray for secondary text */
    --color-border: #dee2e6;

    /* Status Colors */
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    --color-warning: #ffc107;

    /* Typography */
    --font-family-sans-serif: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 1rem; /* 16px */
    --font-size-lg: 1.25rem;
    --font-size-sm: 0.875rem;
    --line-height-base: 1.6;

    /* Sizing & Spacing */
    --spacing-base: 1rem;
    --border-radius: 0.375rem; /* Softer, modern rounded corners */
    --container-max-width: 1200px;
    
    /* Effects */
    --box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --transition-base: 0.2s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-sans-serif);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-secondary);
    background-color: var(--color-white);
    padding-top: 80px; /* Placeholder for fixed header */
}

img, svg {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

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

a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-base);
}

/* 3. Layout & Helpers
---------------------------------------------- */
.container {
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-base);
    padding-right: var(--spacing-base);
}

main {
    display: block;
    padding-top: calc(var(--spacing-base) * 2);
    padding-bottom: calc(var(--spacing-base) * 2);
}

.section {
    padding: calc(var(--spacing-base) * 3) 0;
}

.section-title {
    text-align: center;
    margin-bottom: calc(var(--spacing-base) * 2);
}

/* 4. Core Components
---------------------------------------------- */

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-base);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background-color: #e2e6ea;
    border-color: #dae0e5;
}

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

/* Utility Classes */
.w-100 {
    width: 100% !important;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-base);
}

.form-label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: var(--line-height-base);
    color: var(--color-secondary);
    background-color: var(--color-white);
    background-clip: padding-box;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-control:focus {
    color: var(--color-secondary);
    background-color: var(--color-white);
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(255, 193, 7, 0.5);
}

/* Cards */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.card-img-top {
    width: 100%;
    object-fit: cover;
}

.card-body {
    padding: calc(var(--spacing-base) * 1.5);
}

.card-title {
    margin-bottom: 0.75rem;
}

/* Alerts */
.alert {
    position: relative;
    padding: var(--spacing-base) var(--spacing-base);
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

/* 5. Header & Navigation
---------------------------------------------- */
.header {
    background-color: var(--color-white);
    box-shadow: var(--box-shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
    padding: 0.5rem 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.header-logo a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-secondary);
    text-decoration: none;
}
.header-logo img {
    height: 40px;
    width: auto;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    margin-bottom: 0;
}

.main-nav a {
    font-weight: 600;
    color: var(--color-secondary);
    text-decoration: none;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary-dark);
    border-bottom-color: var(--color-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.currency-switcher {
    position: relative;
}

.currency-switcher select {
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-white);
    font-size: var(--font-size-sm);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    min-width: 100px;
}

.currency-switcher select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(255, 193, 7, 0.25);
}

.language-switcher {
    display: flex;
    align-items: center;
}

.header-actions .icon-link {
    font-size: 1.25rem;
    color: var(--color-gray);
    position: relative;
}

.header-actions .icon-link:hover {
    color: var(--color-secondary);
}

.header-actions .badge {
    position: absolute;
    top: -5px;
    right: -10px;
    font-size: 0.65rem;
    padding: 0.2em 0.5em;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-secondary);
    font-weight: 700;
}

.hamburger-btn {
    display: none;
    border: none;
    background: none;
    font-size: 1.75rem;
    cursor: pointer;
}

/* 6. Footer
---------------------------------------------- */
.footer {
    background-color: var(--color-secondary);
    color: var(--color-light);
    padding: calc(var(--spacing-base) * 3) 0;
    margin-top: calc(var(--spacing-base) * 3);
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-widget h4 {
    color: var(--color-white);
    margin-bottom: 1rem;
}

.footer-widget ul {
    list-style: none;
}

.footer-widget li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid var(--color-gray);
    margin-top: 2rem;
    padding-top: 1.5rem;
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-gray);
}


/* 7. Responsive Styles
---------------------------------------------- */
@media (max-width: 992px) {
    /* Hide brand name on mobile devices */
    .brand-name {
        display: none;
    }
    
    .main-nav {
        display: none;
        position: absolute;
        top: 71px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        box-shadow: var(--box-shadow);
        flex-direction: column;
        width: 100%;
        padding: 1rem;
    }

    .main-nav.active {
        display: flex;
    }

    .main-nav.active .mobile-nav-actions {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        width: 100%;
        text-align: center;
        gap: 0;
    }

    .main-nav ul li a {
        display: block;
        padding: 1rem;
        border-bottom: 1px solid var(--color-border);
    }
     .main-nav a:hover,
    .main-nav a.active {
        border-bottom-color: transparent;
    }

    .mobile-nav-actions {
        display: none;
        border-top: 2px solid var(--color-primary);
        margin-top: 1rem;
        padding-top: 1rem;
    }

    .mobile-nav-link {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding: 1rem;
        color: var(--color-secondary);
        text-decoration: none;
        border-bottom: 1px solid var(--color-border);
        font-weight: 500;
    }

    .mobile-nav-link:hover {
        background-color: var(--color-light);
        color: var(--color-primary-dark);
        text-decoration: none;
    }

    .mobile-nav-link i {
        width: 20px;
        text-align: center;
        color: var(--color-primary);
    }

    .mobile-nav-link .badge {
        margin-left: auto;
        background-color: var(--color-primary);
        color: var(--color-secondary);
        padding: 0.25rem 0.5rem;
        border-radius: 12px;
        font-size: 0.75rem;
        font-weight: 600;
    }

    .hamburger-btn {
        display: block;
    }
}