/* ============================================
   RENMET - Modern Industrial Website Styles
   Mobile-First Responsive Design
   ============================================ */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
    /* Colors - Industrial Palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-secondary: #64748b;
    --color-dark: #1e293b;
    --color-darker: #0f172a;
    --color-light: #f1f5f9;
    --color-lighter: #f8fafc;
    --color-white: #ffffff;
    --color-gray: #94a3b8;
    --color-border: #e2e8f0;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Roboto', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;

    /* 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Container */
    --container-max-width: 1200px;
}

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

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Container
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ============================================
   Typography
   ============================================ */
.section__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-darker);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section__title--center {
    text-align: center;
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-secondary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    text-align: center;
    cursor: pointer;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.header__logo .logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

/* Navigation */
.nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    padding: 0.5rem;
    z-index: 1001;
}

.nav__toggle span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-dark);
    transition: all var(--transition-base);
}

.nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(0.5rem, 0.5rem);
}

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

.nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(0.5rem, -0.5rem);
}

.nav__list {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-white);
    box-shadow: var(--shadow-xl);
    padding: 5rem 2rem 2rem;
    transition: right var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.nav__list.active {
    right: 0;
}

.nav__link {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-dark);
    padding: 0.5rem 0;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

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

@media (min-width: 768px) {
    .nav__toggle {
        display: none;
    }

    .nav__list {
        position: static;
        width: auto;
        height: auto;
        flex-direction: row;
        padding: 0;
        box-shadow: none;
        gap: 2rem;
    }

    .nav__link {
        font-size: 1rem;
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-darker) 0%, var(--color-dark) 100%);
    padding-top: 4rem;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.03) 2px,
            rgba(255, 255, 255, 0.03) 4px
        );
    pointer-events: none;
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, transparent 0%, rgba(0,0,0,0.3) 100%);
}

.hero__content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem 0;
}

.hero__title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero__subtitle {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    color: var(--color-light);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero__scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.scroll-arrow {
    display: block;
    width: 2rem;
    height: 2rem;
    border-left: 2px solid var(--color-white);
    border-bottom: 2px solid var(--color-white);
    transform: rotate(-45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(-45deg);
    }
    40% {
        transform: translateY(10px) rotate(-45deg);
    }
    60% {
        transform: translateY(5px) rotate(-45deg);
    }
}

/* ============================================
   About Section
   ============================================ */
.about {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-lighter);
}

.about__content {
    max-width: 900px;
    margin: 0 auto;
}

.about__description p {
    margin-bottom: 1.25rem;
    font-size: 1.125rem;
    color: var(--color-secondary);
    line-height: 1.8;
}

.about__features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: var(--spacing-lg);
}

.feature {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.feature__icon {
    font-size: 2.5rem;
}

.feature__text {
    display: flex;
    flex-direction: column;
}

.feature__text strong {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: 0.25rem;
}

.feature__text span {
    font-size: 0.875rem;
    color: var(--color-gray);
}

/* ============================================
   Offer Section
   ============================================ */
.offer {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.offer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .offer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .offer__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.offer__card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.offer__card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-10px);
}

.offer__image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.offer__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.offer__card:hover .offer__image img {
    transform: scale(1.1);
}

.offer__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.3) 100%);
}

.offer__content {
    padding: 2rem;
}

.offer__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-darker);
    margin-bottom: 1rem;
}

.offer__description {
    font-size: 1rem;
    color: var(--color-secondary);
    line-height: 1.6;
}

/* ============================================
   Machines Section
   ============================================ */
.machines {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-light);
}

.machines__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 640px) {
    .machines__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .machines__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.machine__card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

.machine__image {
    position: relative;
    height: 280px;
    overflow: hidden;
}

.machine__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.machine__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.machine__card:hover .machine__overlay {
    opacity: 1;
}

.machine__zoom {
    font-size: 2.5rem;
    color: var(--color-white);
    background-color: transparent;
    border: none;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.machine__zoom:hover {
    transform: scale(1.2);
}

.machine__title {
    padding: 1.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-darker);
    text-align: center;
}

/* ============================================
   Map Section
   ============================================ */
.map {
    position: relative;
}

.map__container {
    width: 100%;
    height: 450px;
}

.map__container iframe {
    width: 100%;
    height: 100%;
    display: block;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.contact__grid {
    max-width: 800px;
    margin: 0 auto;
}

.contact__text {
    font-size: 1.125rem;
    color: var(--color-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact__company {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-darker);
    margin-bottom: 2rem;
}

.contact__details {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact__item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact__icon {
    font-size: 1.5rem;
    min-width: 2rem;
}

.contact__item strong {
    display: block;
    font-size: 1rem;
    color: var(--color-darker);
    margin-bottom: 0.25rem;
}

.contact__item a {
    color: var(--color-primary);
    font-size: 1.125rem;
    transition: color var(--transition-fast);
}

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

.contact__item p {
    color: var(--color-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.contact__additional {
    padding: 1.5rem;
    background-color: var(--color-lighter);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.contact__additional p {
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
}

.contact__additional p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--color-darker);
    color: var(--color-light);
    padding: 2rem 0;
}

.footer__content {
    text-align: center;
}

.footer__content p {
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.footer__credit {
    color: var(--color-gray);
    font-size: 0.75rem;
}

/* ============================================
   Lightbox
   ============================================ */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.lightbox.active {
    display: flex;
}

.lightbox__image {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
}

.lightbox__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 3rem;
    color: var(--color-white);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
    transition: transform var(--transition-fast);
}

.lightbox__close:hover {
    transform: scale(1.2);
}

.lightbox__prev,
.lightbox__next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 4rem;
    color: var(--color-white);
    background: none;
    border: none;
    cursor: pointer;
    padding: 1rem;
    line-height: 1;
    transition: all var(--transition-fast);
}

.lightbox__prev:hover,
.lightbox__next:hover {
    transform: translateY(-50%) scale(1.2);
}

.lightbox__prev {
    left: 1rem;
}

.lightbox__next {
    right: 1rem;
}

.lightbox__caption {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-white);
    font-size: 1.25rem;
    text-align: center;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-5px);
}

/* ============================================
   Animations
   ============================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation delays */
.animate-on-scroll:nth-child(1) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.5s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.6s; }

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }