/* ===== CSS RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-400: #9ca3af;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 70px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.section__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-color);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    height: var(--header-height);
}

.nav {
    height: 100%;
}

.nav__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    transition: var(--transition-fast);
}

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

.nav__menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--white);
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.nav__menu.show-menu {
    left: 0;
}

.nav__list {
    padding: var(--spacing-xl) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.nav__link {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--text-color);
    padding: var(--spacing-sm) 0;
    transition: var(--transition-fast);
    border-bottom: 2px solid transparent;
}

.nav__link:hover,
.nav__link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Mobile Hamburger Menu */
.nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: var(--spacing-xs);
    background: none;
    border: none;
    border-radius: 4px;
    transition: var(--transition-fast);
}

.nav__toggle:hover,
.nav__toggle:focus {
    background-color: var(--gray-100);
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.nav__toggle-line {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: var(--transition-fast);
}

.nav__toggle.active .nav__toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav__toggle.active .nav__toggle-line:nth-child(2) {
    opacity: 0;
}

.nav__toggle.active .nav__toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===== MAIN CONTENT ===== */
.main {
    margin-top: var(--header-height);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 80vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    color: var(--white);
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1;
}

.hero__container {
    position: relative;
    z-index: 2;
}

.hero__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 2;
}

.hero__content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.hero__title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero__subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--accent-color);
}

.hero__description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.hero__cta {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.hero__cta:hover {
    background-color: #d97706;
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -5px rgba(0, 0, 0, 0.2);
}

/* ===== PRODUCTS SECTION ===== */
.products {
    padding: var(--spacing-3xl) 0;
    background-color: var(--white);
}

.products__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.products__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.product__card {
    background-color: var(--gray-100);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

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

.product__image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    /* color: var(--gray-400); */
    font-size: var(--font-size-sm);
}

.product__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-fast);
}

.product__image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-400) 100%);
    color: var(--gray-100);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-align: center;
    border: 4px dashed var(--gray-400);
}

.product__content {
    padding: var(--spacing-lg);
}

.product__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.product__description {
    color: var(--primary-color);
    line-height: 1.6;
}

/* ===== CONTACT SECTION ===== */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--gray-50);
}

.contact__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

.contact__info-title,
.contact__form-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.contact__item {
    margin-bottom: var(--spacing-lg);
}

.contact__label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary-dark);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.contact__text {
    color: var(--text-color);
    font-size: var(--font-size-base);
}

.contact__link {
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition-fast);
}

.contact__link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ===== FORM STYLES ===== */
.contact__form {
    background-color: var(--gray-50);
    padding: var(--spacing-xl);
    border-radius: 12px;
}

.form__group {
    margin-bottom: var(--spacing-lg);
}

.form__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.form__input,
.form__textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 4px solid var(--primary-color);
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: var(--transition-fast);
    background-color: var(--gray-50);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form__textarea {
    resize: vertical;
    min-height: 100px;
}

.form__error {
    display: block;
    color: #dc2626;
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.form__submit {
    background-color: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-md) var(--spacing-2xl);
    border: none;
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    width: 100%;
}

.form__submit:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.form__submit:active {
    transform: translateY(0);
}

.form__submit:disabled {
    background-color: var(--gray-400);
    cursor: not-allowed;
    transform: none;
}

/* Form validation states */
.form__input.valid,
.form__textarea.valid {
    border-color: #22c55e;
}

.form__input.invalid,
.form__textarea.invalid {
    border-color: #dc2626;
}

.form__input:focus.valid,
.form__textarea:focus.valid {
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.form__input:focus.invalid,
.form__textarea:focus.invalid {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

/* Form messages */
.form__message {
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.form__message--success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.form__message--error {
    background-color: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

/* Enhanced error styling */
.form__error {
    display: none;
    color: #dc2626;
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    font-weight: 500;
}

.form__error:empty {
    display: none;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--gray-100);
    color: var(--white);
    padding: var(--spacing-xl) 0;
}

.footer__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
}

.footer__text {
    color: var(--gray-200);
    font-size: var(--font-size-sm);
}

.footer__contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer__link {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    transition: var(--transition-fast);
}

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

/* Mobile-specific enhancements */
@media screen and (max-width: 767px) {
    .form__input,
    .form__textarea {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: var(--spacing-lg);
    }
    
    .form__submit {
        padding: var(--spacing-lg) var(--spacing-xl);
        font-size: var(--font-size-lg);
        min-height: 48px; /* Touch-friendly minimum height */
    }
    
    .contact__form {
        padding: var(--spacing-lg);
    }
    
    .form__group {
        margin-bottom: var(--spacing-xl);
    }
    
    /* Enhanced mobile navigation */
    .nav__menu {
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }
    
    /* Touch-friendly button sizes */
    .hero__cta {
        min-height: 48px;
        padding: var(--spacing-lg) var(--spacing-2xl);
    }
    
    .nav__toggle {
        min-height: 44px;
        min-width: 44px;
        justify-content: center;
        align-items: center;
    }
    
    /* Improved text readability on mobile */
    .hero__title {
        font-size: var(--font-size-3xl);
        line-height: 1.1;
    }
    
    .hero__subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero__description {
        font-size: var(--font-size-base);
    }
}

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

/* Tablet Styles */
@media screen and (min-width: 768px) {
    .nav__menu {
        position: static;
        width: auto;
        height: auto;
        background-color: transparent;
        box-shadow: none;
    }
    
    .nav__list {
        flex-direction: row;
        padding: 0;
        gap: var(--spacing-xl);
    }
    
    .nav__link {
        font-size: var(--font-size-base);
    }
    
    .nav__toggle {
        display: none;
    }
    
    .hero__title {
        font-size: var(--font-size-5xl);
    }
    
    .products__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact__content {
        grid-template-columns: 1fr 1fr;
    }
    
    .form__submit {
        width: auto;
    }
    
    .footer__content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: left;
    }
    
    .footer__contact {
        flex-direction: row;
        gap: var(--spacing-lg);
    }
}

/* Desktop Styles */
@media screen and (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
    
    .nav__container {
        padding: 0 var(--spacing-xl);
    }
    
    .hero__container,
    .products__container,
    .contact__container,
    .footer__container {
        padding: 0 var(--spacing-xl);
    }
    
    .products__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .section__title {
        font-size: var(--font-size-4xl);
    }
}/* ===
== PERFORMANCE AND ACCESSIBILITY ENHANCEMENTS ===== */

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10000;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Image loading states */
img.loading {
    opacity: 0.5;
    filter: blur(2px);
    transition: all var(--transition-normal);
}

img.loaded {
    opacity: 1;
    filter: none;
}

img.error {
    opacity: 0.7;
    filter: grayscale(100%);
}

/* Keyboard navigation focus styles */
.keyboard-navigation *:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Enhanced focus styles for interactive elements */
.nav__link:focus,
.hero__cta:focus,
.contact__link:focus,
.footer__link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Loading states for better UX */
.js-enabled .hero {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.loaded .hero {
    opacity: 1;
    transform: translateY(0);
}

/* Enhanced mobile menu animations */
@media screen and (max-width: 767px) {
    .nav__menu {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .nav__menu.show-menu {
        transform: translateX(0);
    }
    
    .nav__list {
        opacity: 0;
        transform: translateY(-20px);
        transition: opacity 0.3s ease 0.1s, transform 0.3s ease 0.1s;
    }
    
    .nav__menu.show-menu .nav__list {
        opacity: 1;
        transform: translateY(0);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --text-color: #000000;
        --text-light: #333333;
        --gray-200: #cccccc;
    }
    
    .hero {
        background: #000080;
    }
    
    .product__card {
        border: 2px solid var(--text-color);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero {
        transform: none !important;
    }
}

/* Print styles */
@media print {
    .header,
    .nav__toggle,
    .hero__cta,
    .form__submit {
        display: none;
    }
    
    .main {
        margin-top: 0;
    }
    
    .hero {
        background: none;
        color: var(--text-color);
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }
    
    .contact__link {
        color: var(--text-color);
        text-decoration: underline;
    }
    
    .contact__link[href^="tel:"]:after {
        content: " (" attr(href) ")";
    }
    
    .contact__link[href^="mailto:"]:after {
        content: " (" attr(href) ")";
    }
}

/* Dark mode support (if user prefers) */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #60a5fa;
        --primary-dark: #3b82f6;
        --text-color: #f9fafb;
        --text-light: #d1d5db;
        --white: #111827;
        --gray-50: #1f2937;
        --gray-100: #374151;
        --gray-200: #4b5563;
        --gray-400: #9ca3af;
        --gray-800: #f9fafb;
        --gray-900: #ffffff;
    }
    
    body {
        background-color: var(--white);
        color: var(--text-color);
    }
    
    .header {
        background-color: rgba(17, 24, 39, 0.95);
    }
    
    .product__card {
        background-color: var(--gray-100);
    }
    
    .contact__form {
        background-color: var(--gray-100);
    }
    
    .form__input,
    .form__textarea {
        background-color: var(--gray-200);
        border-color: var(--gray-400);
        color: var(--text-color);
    }
}

/* Ultra-wide screen optimizations */
@media screen and (min-width: 1400px) {
    :root {
        --container-max-width: 1400px;
    }
    
    .hero__title {
        font-size: 4rem;
    }
    
    .section__title {
        font-size: 3.5rem;
    }
}

/* Small mobile devices */
@media screen and (max-width: 320px) {
    .hero__title {
        font-size: var(--font-size-2xl);
    }
    
    .hero__subtitle {
        font-size: var(--font-size-base);
    }
    
    .nav__container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero__container,
    .products__container,
    .contact__container,
    .footer__container {
        padding: 0 var(--spacing-sm);
    }
}