/* ========================================
   DigitalFlexibil-IT - Main Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg-primary: #0F172A;
    --color-bg-secondary: #1E293B;
    --color-bg-tertiary: #334155;
    --color-bg-card: #1E293B;

    --color-text-primary: #F8FAFC;
    --color-text-secondary: #94A3B8;
    --color-text-muted: #64748B;

    --color-accent-teal: #14B8A6;
    --color-accent-emerald: #059669;
    --color-accent-gradient: linear-gradient(135deg, #14B8A6 0%, #059669 100%);

    --color-border: #334155;
    --color-border-light: #475569;

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

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--color-accent-emerald);
}

ul {
    list-style: none;
}

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

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

/* Typography */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.text-gradient {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: var(--color-text-primary);
    box-shadow: 0 4px 14px rgba(20, 184, 166, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(20, 184, 166, 0.35);
    color: var(--color-text-primary);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-accent-teal);
    color: var(--color-accent-teal);
}

.btn-full {
    width: 100%;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    text-decoration: none;
}

.logo-digital {
    color: var(--color-text-primary);
}

.logo-flexibil {
    color: var(--color-accent-teal);
}

.logo-it {
    color: var(--color-accent-emerald);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-normal);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-link-cta {
    padding: 0.625rem 1.25rem;
    background: var(--color-accent-gradient);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
}

.nav-link-cta:hover {
    color: var(--color-text-primary);
    opacity: 0.9;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: calc(72px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-accent-teal);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.hero-description {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-nodes {
    position: relative;
    width: 400px;
    height: 400px;
}

.node {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

.node-1 { top: 90px; left: 90px; animation-delay: 0s; }
.node-2 { top: 190px; left: 190px; animation-delay: 0.5s; width: 24px; height: 24px; }
.node-3 { top: 140px; left: 290px; animation-delay: 1s; }
.node-4 { top: 290px; left: 140px; animation-delay: 1.5s; }
.node-5 { top: 270px; left: 310px; animation-delay: 2s; }

.node-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.line {
    stroke: var(--color-border-light);
    stroke-width: 1;
    opacity: 0.5;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(20, 184, 166, 0.4);
    }
    50% {
        transform: scale(1.1);
        box-shadow: 0 0 20px 5px rgba(20, 184, 166, 0.2);
    }
}

/* ========================================
   Expertise Section
   ======================================== */
.expertise {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.expertise-card {
    background: var(--color-bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.expertise-card:hover {
    border-color: var(--color-accent-teal);
    transform: translateY(-4px);
}

.expertise-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent-teal);
}

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

.expertise-card h3 {
    margin-bottom: var(--spacing-sm);
}

.expertise-card ul {
    color: var(--color-text-secondary);
}

.expertise-card li {
    padding: var(--spacing-xs) 0;
    position: relative;
    padding-left: 1rem;
}

.expertise-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background: var(--color-accent-teal);
    border-radius: 50%;
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: var(--spacing-2xl) 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.service-item {
    padding: var(--spacing-lg);
    border-left: 2px solid var(--color-border);
    transition: border-color var(--transition-normal);
}

.service-item:hover {
    border-color: var(--color-accent-teal);
}

.service-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent-teal);
    margin-bottom: var(--spacing-sm);
}

.service-item h3 {
    margin-bottom: var(--spacing-sm);
}

.service-item p {
    color: var(--color-text-secondary);
}

/* AI Context Section */
.ai-context {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.08) 0%, rgba(5, 150, 105, 0.08) 100%);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    text-align: center;
}

.ai-context-header {
    margin-bottom: var(--spacing-lg);
}

.ai-context-header h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent-teal);
}

.ai-context-header p {
    color: var(--color-text-secondary);
    font-style: italic;
}

.ai-context-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.ai-context-item {
    padding: var(--spacing-md);
}

.ai-context-item h4 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
}

.ai-context-item p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ========================================
   Solutions Section
   ======================================== */
.solutions {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.solution-card {
    background: var(--color-bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.solution-card:hover {
    border-color: var(--color-accent-teal);
}

.solution-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent-teal);
}

.solution-card p {
    color: var(--color-text-secondary);
}

/* ========================================
   Apps Section
   ======================================== */
.apps {
    padding: var(--spacing-2xl) 0;
}

.app-showcase {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--color-border);
}

.app-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.app-icon {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.app-icon svg {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
}

.app-header h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.app-tagline {
    color: var(--color-text-secondary);
    font-style: italic;
}

.app-description p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.app-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.app-features li {
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.app-features li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-accent-teal);
    border-radius: 50%;
    flex-shrink: 0;
}

.app-links {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Flutter Development */
.flutter-dev {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1) 0%, rgba(5, 150, 105, 0.1) 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    text-align: center;
}

.flutter-dev h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

.flutter-intro {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.flutter-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.flutter-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.flutter-feature svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent-teal);
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.about-lead {
    font-size: 1.25rem;
    color: var(--color-accent-teal);
    margin-bottom: var(--spacing-md);
}

.about-text > p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.ai-belief {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1) 0%, rgba(5, 150, 105, 0.1) 100%);
    border-left: 3px solid var(--color-accent-teal);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.value h4 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.value p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.about-expertise h4 {
    margin-bottom: var(--spacing-md);
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    background: var(--color-bg-primary);
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.tag:hover {
    border-color: var(--color-accent-teal);
    color: var(--color-accent-teal);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: var(--spacing-2xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-item svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent-teal);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-item h4 {
    margin-bottom: var(--spacing-xs);
}

.contact-item p,
.contact-item a {
    color: var(--color-text-secondary);
}

.contact-item .vat {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.contact-form {
    background: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent-teal);
}

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

.form-group select {
    cursor: pointer;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.footer-brand p {
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

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

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

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

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

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

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

    .ai-context-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .expertise-grid {
        grid-template-columns: 1fr;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .services-grid,
    .solutions-grid {
        grid-template-columns: 1fr;
    }

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

    .app-features {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .flutter-features {
        flex-direction: column;
        align-items: center;
    }
}

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

    .hero {
        padding-top: calc(72px + var(--spacing-xl));
    }

    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }

    .app-header {
        flex-direction: column;
        text-align: center;
    }

    .app-links {
        flex-direction: column;
    }

    .app-links .btn {
        width: 100%;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Smooth scroll for anchor links */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--color-accent-teal);
    outline-offset: 2px;
}

/* Selection color */
::selection {
    background: var(--color-accent-teal);
    color: var(--color-bg-primary);
}