/* ============================================
   CENTRIX - Premium Natural Stone & Surfaces
   Luxury Corporate Website Stylesheet
   ============================================ */

/* CSS Custom Properties */
:root {
    --color-primary: #1a1a1a;
    --color-secondary: #2d2d2d;
    --color-accent: #b8956b;
    --color-accent-light: #d4b896;
    --color-gold: #c9a96e;
    --color-white: #ffffff;
    --color-off-white: #f8f7f5;
    --color-cream: #f2efe9;
    --color-light-gray: #e8e6e1;
    --color-mid-gray: #9a9590;
    --color-dark-gray: #4a4a4a;
    --color-text: #1a1a1a;
    --color-text-light: #6b6560;

    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Montserrat', sans-serif;
    --font-accent: 'Montserrat', sans-serif;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-2xl: 10rem;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-luxury: 1.2s cubic-bezier(0.16, 1, 0.3, 1);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
    --shadow-luxury: 0 30px 80px rgba(0,0,0,0.15);

    --navbar-height: 80px;
    --container-max: 1400px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gold);
}

/* Firefox */
html {
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent) var(--color-primary);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--color-text);
    background-color: var(--color-white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
}

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

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

h1, h2, h3, h4, h5, h6 {
    text-transform: uppercase;
}

ul {
    list-style: none;
}

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

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* RTL Support */
[dir="rtl"] {
    direction: rtl;
    text-align: right;
    font-family: 'Beiruti', 'Montserrat', sans-serif;
    font-size: 140%;
    --font-heading: 'Beiruti', sans-serif;
    --font-body: 'Beiruti', sans-serif;
    --font-accent: 'Beiruti', sans-serif;
}

[dir="rtl"] h1,
[dir="rtl"] h2,
[dir="rtl"] h3,
[dir="rtl"] h4 {
    font-family: 'Beiruti', 'Montserrat', sans-serif;
    letter-spacing: 0;
}

[dir="rtl"] .nav-menu {
    direction: rtl;
    margin-left: 0;
    margin-right: auto;
}

[dir="rtl"] .nav-links {
    flex-direction: row-reverse;
}

[dir="rtl"] .hero-content,
[dir="rtl"] .section-header {
    text-align: right;
}

[dir="rtl"] .hero-content {
    text-align: center;
}

[dir="rtl"] .process-timeline::before {
    left: auto;
    right: 24px;
}

[dir="rtl"] .process-step {
    padding-left: 0;
    padding-right: 60px;
}

[dir="rtl"] .process-step::before {
    left: auto;
    right: 18px;
}

[dir="rtl"] .about-grid {
    direction: rtl;
}

[dir="rtl"] .footer-grid {
    direction: rtl;
}

[dir="rtl"] .footer-bottom {
    flex-direction: row-reverse;
}

[dir="rtl"] .footer-links {
    text-align: right;
}

[dir="rtl"] .footer-links ul li {
    text-align: right;
}

[dir="rtl"] .contact-grid {
    direction: rtl;
}

[dir="rtl"] .nav-actions {
    flex-direction: row-reverse;
}

[dir="rtl"] .category-nav .container {
    flex-direction: row-reverse;
}

[dir="rtl"] .stone-specs {
    direction: rtl;
}

[dir="rtl"] .portfolio-filters {
    flex-direction: row-reverse;
}

[dir="rtl"] .approach-grid {
    direction: rtl;
}

[dir="rtl"] .applications-grid {
    direction: rtl;
}

[dir="rtl"] .excellence-grid {
    direction: rtl;
}

[dir="rtl"] .network-regions {
    direction: rtl;
}

[dir="rtl"] .hero-cta {
    flex-direction: row-reverse;
}

[dir="rtl"] .hero-scroll {
    left: auto;
    right: 50%;
    transform: translateX(50%);
}

/* Utility Classes */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 4rem);
}

/* ============================================
   PRELOADER
   ============================================ */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.preloader-inner {
    text-align: center;
}

.preloader-logo {
    width: 180px;
    margin: 0 auto 2rem;
    animation: preloaderPulse 2s ease-in-out infinite;
    filter: brightness(0) invert(1);
}

.preloader-bar {
    width: 200px;
    height: 2px;
    background: rgba(255,255,255,0.15);
    margin: 0 auto;
    overflow: hidden;
    border-radius: 2px;
}

.preloader-progress {
    width: 0%;
    height: 100%;
    background: var(--color-accent);
    transition: width 0.3s ease;
    animation: preloaderBar 2s ease forwards;
}

@keyframes preloaderPulse {
    0%, 100% { opacity: 0.7; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.02); }
}

@keyframes preloaderBar {
    0% { width: 0%; }
    50% { width: 60%; }
    80% { width: 85%; }
    100% { width: 100%; }
}

/* ============================================
   INTRO OVERLAY
   ============================================ */
.intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9500;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.intro-overlay.active {
    opacity: 1;
    visibility: visible;
}

.intro-content {
    text-align: center;
    color: var(--color-white);
    padding: 2rem;
}

.intro-icon {
    width: 80px;
    margin: 0 auto 2rem;
    filter: brightness(0) invert(1);
}

.intro-content h2 {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    letter-spacing: 0.3em;
    margin-bottom: 1rem;
    font-weight: 400;
}

.intro-content p {
    font-size: 0.95rem;
    opacity: 0.7;
    margin-bottom: 2rem;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   SCROLL PROGRESS BAR
   ============================================ */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 9999;
    background: transparent;
}

.scroll-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
    transition: width 0.1s linear;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--navbar-height);
    z-index: 9000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 20px rgba(0,0,0,0.05);
}

.navbar.scrolled .nav-logo img {
    filter: none;
}

.navbar.scrolled .nav-links a {
    color: var(--color-text);
}

.navbar.scrolled .nav-toggle span {
    background: var(--color-text);
}

.navbar.scrolled .lang-toggle {
    color: var(--color-text);
    border-color: var(--color-text);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(0.75rem, 2vw, 2rem);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo img {
    height: 70px;
    width: auto;
    filter: brightness(0) invert(1);
    transition: filter var(--transition-base);
}

.nav-menu {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-white);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

.lang-toggle {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--color-white);
    border: 1px solid rgba(255,255,255,0.4);
    padding: 0.4rem 0.8rem;
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.lang-toggle:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-white);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px 0;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 1.5px;
    background: var(--color-white);
    transition: all var(--transition-base);
    transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    padding: 1rem 2.5rem;
    border-radius: 0;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-gold);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(184, 149, 107, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 1px solid rgba(255,255,255,0.5);
}

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    height: 100vh;
    height: 100dvh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.05);
    animation: heroZoom 20s ease-in-out infinite alternate;
}

.hero-slideshow {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transform: scale(1.05);
    transition: opacity 1.5s ease-in-out;
    animation: heroZoom 20s ease-in-out infinite alternate;
}

.hero-slide.active {
    opacity: 1;
}

@keyframes heroZoom {
    0% { transform: scale(1.05); }
    100% { transform: scale(1.15); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0,0,0,0.4) 0%,
        rgba(0,0,0,0.6) 50%,
        rgba(0,0,0,0.8) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--color-white);
    max-width: 900px;
    padding: 0 2rem;
}

.hero-tagline {
    display: block;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.5em;
    text-transform: uppercase;
    color: var(--color-accent-light);
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeUp 1s ease forwards 0.5s;
}

.hero-tagline strong {
    font-weight: 900;
    -webkit-text-stroke: 0.5px currentColor;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: clamp(1.1rem, 2.2vw, 2rem);
    font-weight: 400;
    line-height: 1.4;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeUp 1s ease forwards 0.8s;
}

.hero-statement {
    font-family: var(--font-accent);
    font-size: clamp(1rem, 2vw, 1.3rem);
    font-weight: 300;
    opacity: 0.8;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeUp 1s ease forwards 1.1s;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeUp 1s ease forwards 1.4s;
}

@keyframes heroFadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-white);
    opacity: 0.6;
    z-index: 2;
}

.hero-scroll span {
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-white), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   SECTION STYLES
   ============================================ */
.section {
    padding: clamp(2.5rem, 5vw, 5rem) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: clamp(3rem, 6vw, 5rem);
}

.section-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--color-primary);
}

/* Scroll Animations */
.section-header,
.about-content,
.about-image,
.about-vision,
.process-step,
.network-content,
.portfolio-item,
.application-card,
.excellence-card,
.approach-card,
.closing-content h2,
.team-card,
.contact-form-wrapper {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.section-header.visible,
.about-content.visible,
.about-image.visible,
.about-vision.visible,
.process-step.visible,
.network-content.visible,
.portfolio-item.visible,
.application-card.visible,
.excellence-card.visible,
.approach-card.visible,
.closing-content h2.visible,
.team-card.visible,
.contact-form-wrapper.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
    background: var(--color-off-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(3rem, 6vw, 6rem);
    align-items: center;
    margin-bottom: 4rem;
}

.about-content p {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--color-dark-gray);
    margin-bottom: 1.5rem;
    text-align: justify;
}

.about-content blockquote {
    font-family: var(--font-accent);
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    color: var(--color-accent);
    padding-left: 2rem;
    border-left: 2px solid var(--color-accent);
    margin-top: 2rem;
}

[dir="rtl"] .about-content blockquote {
    padding-left: 0;
    padding-right: 2rem;
    border-left: none;
    border-right: 2px solid var(--color-accent);
}

.about-image {
    position: relative;
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.about-image:hover img {
    transform: scale(1.03);
}

.about-image::after {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border: 1px solid var(--color-accent);
    z-index: -1;
}

[dir="rtl"] .about-image::after {
    right: auto;
    left: -20px;
}

.about-vision {
    text-align: center;
}

.vision-card {
    background: var(--color-white);
    padding: clamp(2.5rem, 5vw, 4rem);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
}

.vision-card h3 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}

.vision-card p {
    font-family: var(--font-accent);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    line-height: 1.8;
    color: var(--color-dark-gray);
}

/* ============================================
   PROCESS SECTION
   ============================================ */
.process-timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.process-timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--color-accent), transparent);
}

.process-step {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
    position: relative;
    padding-left: 60px;
}

.process-step::before {
    content: '';
    position: absolute;
    left: 18px;
    top: 50%;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    background: var(--color-white);
    transform: translateY(-50%);
    z-index: 1;
}

.step-image {
    width: 280px;
    height: 200px;
    overflow: hidden;
}

.step-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.process-step:hover .step-image img {
    transform: scale(1.05);
}

.step-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.step-number {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.step-content h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.step-content p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   GLOBAL NETWORK SECTION
   ============================================ */
.network {
    background: var(--color-primary);
    color: var(--color-white);
}

.network .section-label {
    color: var(--color-accent-light);
}

.network .section-title {
    color: var(--color-white);
}

.network-content {
    text-align: center;
}

.network-map {
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.network-map img {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}

.network-disclaimer {
    font-size: 0.75rem;
    opacity: 0.5;
    margin-top: 1rem;
}

.network-text h3 {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 400;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
}

.network-regions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.network-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.network-regions span {
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.7;
    padding: 0.5rem 1rem;
    border: 1px solid rgba(255,255,255,0.15);
    transition: all var(--transition-fast);
}

.network-regions span:hover {
    opacity: 1;
    border-color: var(--color-accent);
    color: var(--color-accent-light);
}

/* ============================================
   MATERIAL PORTFOLIO SECTION
   ============================================ */
.portfolio {
    background: var(--color-off-white);
}

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-light-gray);
    color: var(--color-text-light);
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.portfolio-item {
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.portfolio-item.hidden {
    display: none;
}

.portfolio-card {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
}

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

.portfolio-card:hover img {
    transform: scale(1.08);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: var(--color-white);
    transform: translateY(20px);
    opacity: 0;
    transition: all var(--transition-base);
}

.portfolio-card:hover .portfolio-overlay {
    transform: translateY(0);
    opacity: 1;
}

.portfolio-overlay h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    letter-spacing: 0.1em;
    margin-bottom: 0.25rem;
}

.portfolio-overlay span {
    font-size: 0.75rem;
    opacity: 0.7;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ============================================
   ARCHITECTURAL APPLICATIONS
   ============================================ */
.applications-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.application-card {
    position: relative;
    overflow: hidden;
    height: 350px;
    cursor: default;
    pointer-events: none;
}

.application-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

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

.application-card:hover .application-image img {
    transform: scale(1.05);
}

.application-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.35);
    transition: background var(--transition-base);
}

.application-card:hover .application-overlay {
    background: rgba(0,0,0,0.5);
}

.application-content {
    position: absolute;
    bottom: 3rem;
    left: 3rem;
    color: var(--color-white);
    z-index: 2;
}

.application-content h3 {
    font-family: var(--font-heading);
    font-size: clamp(1.3rem, 2.5vw, 2rem);
    font-weight: 400;
    letter-spacing: 0.1em;
}

.applications-statement {
    text-align: center;
    font-family: var(--font-accent);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--color-text-light);
}

/* ============================================
   TECHNICAL EXCELLENCE
   ============================================ */
.excellence {
    background: var(--color-cream);
}

.excellence-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
    perspective: 1200px;
}

.excellence-card {
    background: transparent;
    box-shadow: none;
    transform-style: preserve-3d;
    min-height: 220px;
}

.excellence-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: inherit;
    transform-style: preserve-3d;
    transition: transform 0.7s var(--transition-base, ease);
}

.excellence-card:hover .excellence-card-inner,
.excellence-card:focus-within .excellence-card-inner {
    transform: rotateY(180deg);
}

.excellence-card-face {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2.5rem 2rem;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.excellence-card-back {
    transform: rotateY(180deg);
    background: var(--color-accent, #b08d57);
    color: var(--color-white);
}

.excellence-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1.5rem;
    color: var(--color-accent);
}

.excellence-icon svg {
    width: 100%;
    height: 100%;
}

.excellence-card h4 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.08em;
}

.excellence-reveal {
    font-family: var(--font-body);
    font-size: 0.8rem;
    line-height: 1.5;
    color: inherit;
    margin: 0;
}

.excellence-statement {
    text-align: center;
    font-family: var(--font-accent);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   OUR APPROACH
   ============================================ */
.approach-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.approach-card {
    background: var(--color-off-white);
    padding: clamp(2rem, 4vw, 3.5rem);
    border-top: 2px solid var(--color-accent);
    transition: all var(--transition-base);
}

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

.approach-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-accent);
    opacity: 0.4;
    display: block;
    margin-bottom: 1.5rem;
}

.approach-card h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: 0.03em;
}

.approach-statement {
    text-align: center;
    font-family: var(--font-accent);
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   FAQ
   ============================================ */
.faq {
    background: var(--color-off-white);
}

.faq-list {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-light-gray);
}

.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 1.5rem 3rem 1.5rem 0;
    position: relative;
    font-family: var(--font-heading);
    font-size: clamp(1rem, 2vw, 1.15rem);
    font-weight: 500;
    color: var(--color-primary);
    transition: color var(--transition-base);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary:hover {
    color: var(--color-accent);
}

.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--color-accent);
    transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
    content: '\2212';
}

.faq-answer {
    padding: 0 3rem 1.75rem 0;
}

.faq-answer p {
    color: var(--color-text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

.faq-answer a {
    color: var(--color-accent);
    text-decoration: underline;
}

/* ============================================
   CLOSING STATEMENT
   ============================================ */
.closing {
    position: relative;
    padding: clamp(8rem, 15vw, 14rem) 0;
    overflow: hidden;
}

.closing-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

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

.closing-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.closing-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.closing-content h2 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 2vw, 1.6rem);
    font-weight: 400;
    color: var(--color-white);
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.closing-content h2:last-child {
    color: var(--color-accent-light);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    background: var(--color-off-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(3rem, 6vw, 5rem);
    margin-bottom: 4rem;
}

.contact-team {
    display: grid;
    gap: 1.5rem;
}

.team-card {
    background: var(--color-white);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.team-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.team-card h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.team-role {
    display: block;
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.team-contact,
.team-email {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.35rem;
    transition: color var(--transition-fast);
}

.team-contact:hover,
.team-email:hover {
    color: var(--color-accent);
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1.2rem 1rem 0.6rem;
    border: 1px solid var(--color-light-gray);
    background: var(--color-white);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    outline: none;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
}

.form-group label {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.85rem;
    color: var(--color-mid-gray);
    pointer-events: none;
    transition: all var(--transition-fast);
}

[dir="rtl"] .form-group label {
    left: auto;
    right: 1rem;
}

.form-group textarea ~ label {
    top: 1.2rem;
    transform: none;
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: 0.5rem;
    font-size: 0.7rem;
    color: var(--color-accent);
    transform: none;
}

.form-error {
    display: none;
    font-size: 0.75rem;
    color: #d32f2f;
    margin-top: 0.25rem;
    padding-left: 1rem;
}

[dir="rtl"] .form-error {
    padding-left: 0;
    padding-right: 1rem;
}

.form-group.error input,
.form-group.error textarea {
    border-color: #d32f2f;
}

.form-group.error .form-error {
    display: block;
}

.btn-submit {
    align-self: flex-start;
}

[dir="rtl"] .btn-submit {
    align-self: flex-end;
}

/* Contact Extras */
.contact-qr {
    background: var(--color-white);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.contact-qr h4 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.qr-placeholder img {
    max-width: 200px;
    margin: 0 auto;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: clamp(2.5rem, 5vw, 3.5rem) 0 1.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 2fr 1fr;
    gap: 4rem;
    align-items: start;
    margin-bottom: 2.5rem;
}

.footer-logo {
    height: 70px;
    width: auto;
    filter: brightness(0) invert(1);
    margin-bottom: 1.5rem;
}

.footer-brand p {
    font-size: 0.9rem;
    opacity: 0.6;
    line-height: 1.7;
    max-width: 300px;
}

.footer-links h4,
.footer-contact h4,
.footer-newsletter h4 {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.footer-links {
    text-align: center;
}

.footer-links ul li {
    text-align: center;
}

.footer-links a {
    font-size: 0.85rem;
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--color-accent-light);
}

.footer-contact a {
    display: block;
    font-size: 0.85rem;
    opacity: 0.6;
    margin-bottom: 0.5rem;
    transition: opacity var(--transition-fast);
}

.footer-contact a:hover {
    opacity: 1;
}

.footer-bottom .lang-toggle {
    color: rgba(255,255,255,0.7);
    border-color: rgba(255,255,255,0.3);
    margin-bottom: 1rem;
}

.newsletter-form {
    display: flex;
    gap: 0;
}

.newsletter-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(255,255,255,0.2);
    background: transparent;
    color: var(--color-white);
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.newsletter-form input:focus {
    border-color: var(--color-accent);
}

.newsletter-form input::placeholder {
    color: rgba(255,255,255,0.4);
}

.newsletter-form button {
    padding: 0.75rem 1rem;
    background: var(--color-accent);
    color: var(--color-white);
    border: 1px solid var(--color-accent);
    transition: background var(--transition-fast);
}

.newsletter-form button:hover {
    background: var(--color-gold);
}

.newsletter-form button svg {
    width: 18px;
    height: 18px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    font-size: 0.8rem;
    opacity: 0.5;
}

.footer-bottom p a {
    color: var(--color-accent-light);
    transition: color 0.3s;
}

.footer-bottom p a:hover {
    color: gold;
}

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 8000;
    box-shadow: var(--shadow-md);
}

[dir="rtl"] .back-to-top {
    right: auto;
    left: 2rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-accent);
    transform: translateY(-3px);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   WHATSAPP BUTTON
   ============================================ */
.whatsapp-btn {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    width: 56px;
    height: 56px;
    background: #25d366;
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    z-index: 8000;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
    transition: all var(--transition-base);
    animation: whatsappPulse 2s infinite;
}

[dir="rtl"] .whatsapp-btn {
    left: auto;
    right: 2rem;
}

[dir="rtl"] .back-to-top {
    right: auto;
    left: 6rem;
}

.whatsapp-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(37, 211, 102, 0.5);
}

.whatsapp-btn svg {
    width: 28px;
    height: 28px;
}

@keyframes whatsappPulse {
    0%, 100% { box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4); }
    50% { box-shadow: 0 4px 30px rgba(37, 211, 102, 0.6); }
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        height: 100dvh;
        background: var(--color-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-links {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }

    .nav-links a {
        font-size: 1.1rem;
        color: var(--color-white) !important;
        padding: 0.6rem 1rem;
    }

    .nav-toggle {
        display: flex;
        z-index: 100;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-image img {
        height: 350px;
    }

    .process-step {
        grid-template-columns: 1fr;
    }

    .step-image {
        width: 100%;
        height: 250px;
    }

    .excellence-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .approach-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .contact-extras {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .application-card {
        height: 280px;
    }
}

/* ============================================
   RESPONSIVE - MOBILE
   ============================================ */
@media (max-width: 768px) {
    :root {
        --navbar-height: 70px;
    }

    .nav-logo img {
        height: 60px;
        padding-top: 2px;
    }

    .nav-container {
        padding: 0 1.5rem;
    }

    .nav-links a {
        font-size: 1.2rem;
    }

    .hero {
        min-height: 100vh;
        min-height: 100dvh;
    }

    .hero-content {
        padding: 0 1.25rem;
    }

    .hero-content h1 {
        font-size: clamp(1.2rem, 5vw, 2rem);
    }

    .hero-statement {
        font-size: clamp(0.9rem, 3.5vw, 1.2rem);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .btn {
        padding: 0.9rem 2rem;
        font-size: 0.75rem;
        min-height: 44px;
        min-width: 44px;
    }

    .application-card {
        height: 200px;
    }

    .application-content {
        bottom: 1.5rem;
        left: 1.5rem;
    }

    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .section {
        padding: clamp(2rem, 4vw, 4rem) 0;
    }

    .section-header {
        margin-bottom: clamp(2rem, 4vw, 3.5rem);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .footer-brand,
    .footer-links,
    .footer-contact {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-brand p {
        max-width: none;
    }

    .footer-links ul {
        padding: 0;
        list-style: none;
    }

    .footer-contact a {
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .closing-content h2 {
        font-size: clamp(1.2rem, 4vw, 1.8rem);
    }

    .closing {
        padding: clamp(5rem, 10vw, 10rem) 0;
    }

    .whatsapp-btn {
        width: 50px;
        height: 50px;
        bottom: 1.5rem;
        left: 1.5rem;
    }

    .back-to-top {
        width: 44px;
        height: 44px;
        bottom: 1.5rem;
        right: 1.5rem;
    }

    .about-content blockquote {
        font-size: clamp(1rem, 3vw, 1.3rem);
    }

    .vision-card {
        padding: clamp(1.5rem, 4vw, 3rem);
    }

    .network-regions span {
        font-size: 0.7rem;
        padding: 0.4rem 0.8rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 1rem;
    }

    .hero-tagline {
        font-size: 0.65rem;
        letter-spacing: 0.3em;
    }

    .applications-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .application-card {
        height: 200px;
    }

    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .excellence-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .excellence-card {
        min-height: 180px;
    }

    .excellence-card-face {
        padding: 2rem 1.5rem;
    }

    .process-step {
        padding-left: 40px;
    }

    .process-timeline::before {
        left: 14px;
    }

    .process-step::before {
        left: 8px;
        width: 11px;
        height: 11px;
    }

    .step-image {
        height: 180px;
    }

    .team-card {
        padding: 1.5rem;
    }

    .newsletter-form {
        flex-direction: column;
        gap: 0.5rem;
    }

    .newsletter-form button {
        width: 100%;
        padding: 0.85rem;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .navbar,
    .preloader,
    .intro-overlay,
    .back-to-top,
    .whatsapp-btn,
    #scroll-progress {
        display: none !important;
    }

    .hero {
        height: auto;
        min-height: 0;
    }

    .section {
        padding: 2rem 0;
    }
}

/* ============================================
   SAFE AREA (NOTCHED PHONES)
   ============================================ */
@supports (padding: env(safe-area-inset-bottom)) {
    .footer {
        padding-bottom: calc(1.5rem + env(safe-area-inset-bottom));
    }

    .whatsapp-btn {
        bottom: calc(1.5rem + env(safe-area-inset-bottom));
    }

    .back-to-top {
        bottom: calc(2rem + env(safe-area-inset-bottom));
    }

    .nav-container {
        padding-left: max(clamp(0.75rem, 2vw, 2rem), env(safe-area-inset-left));
        padding-right: max(clamp(0.75rem, 2vw, 2rem), env(safe-area-inset-right));
    }
}

/* ============================================
   TOUCH ACCESSIBILITY
   ============================================ */
@media (pointer: coarse) {
    .nav-links a {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    .filter-btn {
        min-height: 44px;
        padding: 0.85rem 1.5rem;
    }

    .footer-links a {
        display: inline-block;
        padding: 0.35rem 0;
        min-height: 44px;
        line-height: 44px;
    }

    .category-nav a {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    .network-regions span {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }
}