/* ==========================================================================
   DESIGN SYSTEM - GF COSTRUZIONI SRLS
   Style: Minimalist, Architectural, Premium, B2B-oriented
   Fonts: Montserrat (Headings, buttons, labels), Lora (Body text, quotes)
   ========================================================================== */

/* --- CSS Variables / Design Tokens --- */
:root {
    /* Color Palette */
    --color-primary: #0f172a;       /* Slate Deep (Main corporate color) */
    --color-primary-light: #1e293b; /* Secondary Slate */
    --color-primary-dark: #020617;  /* Darkest Navy */
    
    /* Brand Colors from Logo (Cyan & Magenta) */
    --color-accent: #009fe3;        /* Electric Cyan (Main logo brand color) */
    --color-accent-hover: #0082ba;  /* Darker Cyan for hover */
    --color-accent-light: #e6f6fc;  /* Soft light Cyan background */
    
    --color-accent-secondary: #e5007d; /* Magenta (Secondary logo brand color for highlights) */
    --color-accent-secondary-hover: #c4006a;
    --color-accent-secondary-light: #fdf0f7;
    
    --color-bg-light: #faf9f6;      /* Off-White / Architectural Paper */
    --color-bg-white: #ffffff;      /* Pure white for panels */
    --color-bg-dark: #0f172a;       /* Dark section background */
    
    /* Text Colors */
    --color-text-main: #334155;     /* Charcoal Slate for readability */
    --color-text-muted: #64748b;    /* Medium Slate for subtitles and captions */
    --color-text-white: #ffffff;    /* White text */
    --color-text-white-muted: #94a3b8; /* Muted light text */
    
    /* Borders */
    --color-border: #e2e8f0;        /* Light grid border */
    --color-border-dark: #cbd5e1;   /* Medium grid border */
    --color-border-gold: #009fe3;   /* Accent border (formerly gold, now cyan) */
    --color-border-magenta: #e5007d; /* Secondary accent border */
    
    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Lora', serif;
    
    /* Transitions & Animations */
    --transition-speed: 0.3s;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text-main);
    background-color: var(--color-bg-light);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

blockquote {
    font-family: var(--font-body);
    font-style: italic;
}

/* --- Layout Utility Classes --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 1rem 2rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-text-white);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* On dark backgrounds */
.method-section .btn-secondary {
    color: var(--color-text-white);
    border-color: var(--color-text-white);
}

.method-section .btn-secondary:hover {
    background-color: var(--color-text-white);
    color: var(--color-primary);
}

/* --- Typographic System Enhancements --- */
/* (Placeholders removed for a clean typographic design) */

/* --- Section Headings (B2B Grid Layout) --- */
.section-num {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-accent);
    display: block;
    margin-bottom: 0.5rem;
    letter-spacing: 0.1em;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

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

.white-num {
    color: var(--color-accent);
}

.section-subtitle {
    font-family: var(--font-body);
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin-bottom: 3rem;
}

/* Grid layout for structured section header/body */
.section-grid {
    display: grid;
    grid-template-columns: 1fr 1.8fr;
    gap: 4rem;
    padding: 6rem 0;
    border-bottom: 1px solid var(--color-border);
}

.section-intro {
    padding-top: 6rem;
}

/* --- Header / Navigation --- */
.site-header {
    height: var(--header-height);
    background-color: rgba(250, 249, 246, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    transition: var(--transition-smooth);
}

.site-header.scrolled {
    height: 70px;
    background-color: var(--color-bg-white);
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
}

.header-container {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-box {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 52px;
    width: auto;
    display: block;
    mix-blend-mode: multiply; /* Removes white background from JPEG logo */
    transition: var(--transition-smooth);
}

.site-header.scrolled .logo-img {
    height: 44px;
}

.logo-subtitle {
    font-family: var(--font-heading);
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-top: 0.15rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.nav-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-smooth);
}

.nav-menu ul {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-main);
    display: inline-block;
    padding: 0.5rem 0;
    position: relative;
}

.nav-num {
    color: var(--color-accent-secondary); /* Magenta accent */
    margin-right: 0.25rem;
    font-size: 0.75rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition-smooth);
}

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

.nav-link:hover::after {
    width: 100%;
}

.cta-nav-link {
    background-color: var(--color-primary);
    color: var(--color-text-white);
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--color-primary);
}

.cta-nav-link:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary);
}

.cta-nav-link::after {
    display: none;
}

/* --- Hero Section --- */
.hero-section {
    padding-top: calc(var(--header-height) + 4rem);
    padding-bottom: 6rem;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-light);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 1.3fr;
    gap: 4rem;
    align-items: center;
}

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

.hero-main-img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
    border: 1px solid var(--color-border);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    transition: var(--transition-smooth);
}

.hero-visual:hover .hero-main-img {
    border-color: var(--color-accent);
    transform: scale(1.01);
}

.hero-tagline {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent-secondary); /* Magenta accent */
    letter-spacing: 0.2em;
    display: block;
    margin-bottom: 1rem;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-desc {
    font-family: var(--font-body);
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
}

/* --- Chi Siamo (About) --- */
.about-quote {
    font-size: 1.5rem;
    line-height: 1.5;
    color: var(--color-primary-light);
    border-left: 2px solid var(--color-accent);
    padding-left: 1.5rem;
    margin-top: 2rem;
}

.about-content h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    margin-top: 2rem;
}

.about-content h3:first-of-type {
    margin-top: 0;
}

.about-content p {
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--color-text-main);
    margin-bottom: 2rem;
}

.about-content p:last-of-type {
    margin-bottom: 0;
}

/* --- Servizi (Services) --- */
.services-section {
    padding-bottom: 6rem;
    border-bottom: 1px solid var(--color-border);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
}

.service-card {
    background-color: var(--color-bg-white);
    padding: 3.5rem 2.5rem;
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-smooth);
}

.service-header {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.5rem;
}

.service-num {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 300;
    color: var(--color-border-dark);
    line-height: 1;
    margin-bottom: 0.75rem;
    transition: var(--transition-smooth);
}

.service-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-primary);
    line-height: 1.3;
}

.service-desc {
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

/* Hover effects (Minimalist & Architectural) */
.service-card:hover {
    background-color: var(--color-primary);
}

.service-card:hover .service-num {
    color: var(--color-accent);
    transform: translateY(-5px);
}

.service-card:hover .service-title {
    color: var(--color-text-white);
}

.service-card:hover .service-desc {
    color: var(--color-text-white-muted);
}

/* --- Metodo di Lavoro --- */
.method-section {
    background-color: var(--color-bg-dark);
    padding-bottom: 8rem;
    overflow: hidden;
}

.text-light {
    color: var(--color-text-white);
}

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

.timeline-container {
    position: relative;
    margin-top: 4rem;
    padding-top: 2rem;
}

.timeline-line {
    position: absolute;
    top: 50px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.1);
    z-index: 1;
}

.timeline-steps {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 2rem;
    position: relative;
    z-index: 2;
}

.timeline-step {
    display: flex;
    flex-direction: column;
    cursor: pointer;
}

.step-marker {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-text-white-muted);
    margin-bottom: 1.5rem;
    transition: var(--transition-smooth);
}

.step-title {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-white);
    margin-bottom: 1rem;
    transition: var(--transition-smooth);
}

.step-content {
    font-family: var(--font-body);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--color-text-white-muted);
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.4s ease;
}

/* Active Step Style */
.timeline-step.active .step-marker {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary);
    box-shadow: 0 0 0 8px rgba(0, 159, 227, 0.2); /* Cyan shadow */
}

.timeline-step.active .step-title {
    color: var(--color-accent);
}

.timeline-step.active .step-content {
    max-height: 200px;
    opacity: 1;
}

/* Hover style */
.timeline-step:hover .step-marker {
    border-color: var(--color-accent);
    color: var(--color-text-white);
}

/* --- Perché Sceglierci --- */
.why-us-section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--color-border);
}

.why-us-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 5rem;
}

.benefit-item {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--color-border);
}

.benefit-item:last-of-type {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.benefit-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.benefit-num {
    color: var(--color-accent-secondary); /* Magenta accent */
    font-size: 0.95rem;
    margin-right: 0.5rem;
    font-weight: 700;
}

.benefit-desc {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-muted);
}

/* --- Portfolio Casi Studio --- */
.portfolio-section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--color-border);
}

.portfolio-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 4rem;
}

.portfolio-header .section-subtitle {
    margin-bottom: 0;
}

.portfolio-filters {
    display: flex;
    gap: 0.75rem;
}

.filter-btn {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.6rem 1.2rem;
    background-color: transparent;
    border: 1px solid var(--color-border-dark);
    color: var(--color-text-main);
    cursor: pointer;
    transition: var(--transition-smooth);
}

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

.portfolio-grid {
    display: flex;
    flex-direction: column;
    gap: 6rem;
}

/* Project Card layout */
.project-card {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding-bottom: 6rem;
    border-bottom: 1px solid var(--color-border);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.project-card:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* Filtering animation support */
.project-card.fade-out {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
    padding: 0;
    margin: 0;
    border: none;
}

.badge-hero {
    display: inline-block;
    background-color: var(--color-accent);
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    padding: 0.4rem 0.8rem;
    text-transform: uppercase;
    margin-bottom: 1rem;
    width: fit-content;
}

.project-meta {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 0.5rem;
}

.project-title-text {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.3;
    margin-bottom: 2rem;
}

.project-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.detail-block h4 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary-light);
    margin-bottom: 0.5rem;
}

.detail-block p {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-main);
}

.check-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.check-list li {
    font-family: var(--font-body);
    font-size: 0.95rem;
    position: relative;
    padding-left: 1.5rem;
    color: var(--color-text-main);
}

.check-list li::before {
    content: '\2014'; /* Architectural dash */
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

.project-result {
    background-color: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    padding: 1.5rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-primary-light);
    line-height: 1.6;
}

.project-result strong {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent-hover);
    display: block;
    margin-bottom: 0.25rem;
}

/* Hero Case Study Layout adjustment */
.hero-project {
    border-bottom: 2px solid var(--color-accent);
    background-color: var(--color-bg-white);
    padding: 4rem;
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-accent);
}



/* --- Contatti & Call to Action (Contacts) --- */
.contact-section {
    padding: 6rem 0;
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 5rem;
}

.contact-subtitle {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 3rem;
}

.info-blocks {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.info-block h3 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent-hover);
    margin-bottom: 0.5rem;
}

.info-block p {
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--color-text-main);
    line-height: 1.5;
}

.contact-link {
    color: var(--color-primary);
    font-weight: 600;
}

.contact-link:hover {
    color: var(--color-accent);
}

.technical-details {
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.technical-details p {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* Contact Form styling */
.form-wrapper {
    border: 1px solid var(--color-border);
    padding: 3rem;
    background-color: var(--color-bg-light);
    border-left: 3px solid var(--color-primary);
}

.form-wrapper h3 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.form-intro {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group label {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.8rem 1rem;
    border: 1px solid var(--color-border-dark);
    background-color: var(--color-bg-white);
    color: var(--color-text-main);
    transition: var(--transition-smooth);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 159, 227, 0.1); /* Cyan focus shadow */
}

/* Custom styling for dropdown select */
.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23334155' d='M10.293 3.293L6 7.586 1.707 3.293A1 1 0 00.293 4.707l5 5a1 1 0 001.414 0l5-5a1 1 0 10-1.414-1.414z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.privacy-group {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 1rem;
    margin-bottom: 2rem;
}

.privacy-group input[type="checkbox"] {
    margin-top: 0.3rem;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.privacy-group label {
    font-family: var(--font-body);
    font-size: 0.8rem;
    text-transform: none;
    letter-spacing: 0;
    color: var(--color-text-muted);
    cursor: pointer;
}

/* Validation styling */
.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
    border-color: #ef4444;
}

.error-msg {
    display: none;
    font-family: var(--font-heading);
    font-size: 0.65rem;
    font-weight: 600;
    color: #ef4444;
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

/* Form Submit Feedback */
.form-response {
    display: none;
    padding: 1.5rem;
    margin-top: 1.5rem;
    border-left: 3px solid;
    animation: fadeIn 0.4s ease;
}

.success-response {
    border-left-color: #10b981;
    background-color: #ecfdf5;
    color: #065f46;
}

.success-response h4 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.success-response p {
    font-family: var(--font-body);
    font-size: 0.88rem;
    line-height: 1.5;
}

.error-response {
    border-left-color: #ef4444;
    background-color: #fef2f2;
    color: #991b1b;
}

.error-response h4 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.error-response p {
    font-family: var(--font-body);
    font-size: 0.88rem;
    line-height: 1.5;
}

/* --- Footer --- */
.site-footer {
    background-color: var(--color-primary-dark);
    color: var(--color-text-white);
    padding: 5rem 0 3rem 0;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 4rem;
}

.footer-brand .logo-img {
    background-color: #ffffff;
    padding: 0.4rem 0.8rem;
    border: 1px solid rgba(255, 255, 255, 0.15);
    height: 52px;
    width: auto;
    display: inline-block;
    margin-bottom: 1rem;
}

.footer-brand-desc {
    margin-top: 1.5rem;
    font-family: var(--font-body);
    color: var(--color-text-white-muted);
    max-width: 320px;
    line-height: 1.6;
}

.footer-links h4,
.footer-socials h4 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    font-family: var(--font-heading);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-white-muted);
}

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

.footer-socials p {
    font-family: var(--font-body);
    color: var(--color-text-white-muted);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.legal-info p {
    color: var(--color-text-white-muted);
    font-size: 0.78rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

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

.legal-info a {
    color: var(--color-text-white);
    border-bottom: 1px dashed rgba(255,255,255,0.3);
}

.legal-info a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.tech-signature p {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    text-transform: uppercase;
}

/* --- Animations --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */

/* Tablet Layout (1024px and down) */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: left;
    }
    
    .hero-actions {
        justify-content: flex-start;
    }
    
    .hero-visual {
        max-width: 100%;
        width: 100%;
    }
    
    .section-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        padding: 4rem 0;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .why-us-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .project-card {
        gap: 2rem;
    }
    
    .project-details {
        grid-template-columns: 1fr 1fr;
        gap: 2.5rem;
    }
    
    .hero-project {
        padding: 2.5rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 4rem;
    }
    
    .footer-top {
        grid-template-columns: 1fr 1fr;
    }
}

/* Mobile Nav Styles & Small Screen Adjustment (768px and down) */
@media (max-width: 768px) {
    .site-header {
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-bg-white);
        border-top: 1px solid var(--color-border);
        padding: 3rem 2rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: transform 0.4s ease, opacity 0.4s ease, visibility 0.4s ease;
        z-index: 99;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: all;
    }
    
    .nav-menu ul {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
    }
    
    .nav-link {
        font-size: 1.1rem;
        padding: 0.5rem 0;
    }
    
    .cta-nav-link {
        display: block;
        text-align: center;
        width: 100%;
        margin-top: 1rem;
        padding: 1rem;
    }
    
    /* Hamburger Close State */
    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-line {
        display: none;
    }
    
    .timeline-steps {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .timeline-step {
        cursor: default;
    }
    
    .step-marker {
        width: 48px;
        height: 48px;
        font-size: 0.9rem;
        margin-bottom: 0.75rem;
    }
    
    /* Force show content on mobile timeline since clicking is less intuitive */
    .step-content {
        max-height: none !important;
        opacity: 1 !important;
        margin-top: 0.5rem;
    }

    .project-details {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .portfolio-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    
    .portfolio-filters {
        flex-wrap: wrap;
        width: 100%;
    }
    
    .filter-btn {
        flex: 1 1 calc(50% - 0.5rem);
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .form-wrapper {
        padding: 2rem 1.5rem;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: left;
    }
}

/* Smaller mobile devices (480px and down) */
@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        gap: 1rem;
    }
    
    .filter-btn {
        flex: 1 1 100%;
    }
}