/* ============================================
   ŠELMA SOLUTIONS - Design System
   Low-poly cyber-tech minimalism
   ============================================ */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
    /* Primary Colors - extracted from logo */
    --color-purple-deep: #2D1B3D;
    --color-purple-mid: #4A2B5C;
    --color-purple-light: #6B3D7A;
    --color-purple-accent: #8B4D9A;
    
    /* Orange Accent Palette */
    --color-orange-primary: #E87A2A;
    --color-orange-light: #F59D4D;
    --color-orange-bright: #FF8C42;
    --color-orange-glow: rgba(232, 122, 42, 0.3);
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-gray-100: #F5F3F7;
    --color-gray-200: #E8E4EC;
    --color-gray-300: #C9C2D0;
    --color-gray-400: #9A8FA6;
    --color-gray-500: #6B5F7A;
    --color-gray-600: #4A4055;
    
    /* Semantic Colors */
    --color-bg-primary: var(--color-purple-deep);
    --color-bg-secondary: #231529;
    --color-bg-card: rgba(74, 43, 92, 0.4);
    --color-text-primary: var(--color-white);
    --color-text-secondary: var(--color-gray-300);
    --color-text-muted: var(--color-gray-400);
    --color-accent: var(--color-orange-primary);
    --color-accent-hover: var(--color-orange-light);
    
    /* Typography */
    --font-primary: 'Outfit', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;
    --text-6xl: 4.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Layout */
    --container-max: 1200px;
    --container-padding: var(--space-6);
    
    /* Effects */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px var(--color-orange-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Z-index layers */
    --z-background: -1;
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
}

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

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

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

/* Selection */
::selection {
    background-color: var(--color-orange-primary);
    color: var(--color-white);
}

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--color-orange-primary);
    outline-offset: 4px;
}

/* ---------- Network Background Canvas ---------- */
#network-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-background);
    pointer-events: none;
    opacity: 0.6;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

@media (max-width: 768px) {
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-3xl); }
    h3 { font-size: var(--text-xl); }
}

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

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

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

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

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.section-title {
    margin-bottom: var(--space-6);
}

.section-description {
    font-size: var(--text-lg);
    max-width: 600px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-orange-primary), var(--color-orange-bright));
    color: var(--color-white);
    box-shadow: var(--shadow-md), 0 0 20px var(--color-orange-glow);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px var(--color-orange-glow);
}

.btn--outline {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-purple-light);
}

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

.btn--full {
    width: 100%;
}

/* ---------- Navigation ---------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    padding: var(--space-4) 0;
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, transparent 100%);
    transition: background var(--transition-base);
}

.nav.scrolled {
    background: rgba(35, 21, 41, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(107, 61, 122, 0.3);
}

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

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav__logo-text {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

.nav__logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.footer__logo-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
}

.nav__link {
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.nav__link--cta {
    padding: var(--space-2) var(--space-5);
    background: var(--color-accent);
    color: var(--color-white);
    border-radius: var(--radius-md);
}

.nav__link--cta:hover {
    background: var(--color-accent-hover);
    color: var(--color-white);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }
    
    .nav__menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(35, 21, 41, 0.98);
        backdrop-filter: blur(12px);
        padding: var(--space-4);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-base);
    }
    
    .nav__menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav__menu li {
        width: 100%;
    }
    
    .nav__link {
        display: block;
        padding: var(--space-4);
        text-align: center;
        border-bottom: 1px solid rgba(107, 61, 122, 0.2);
    }
    
    .nav__link--cta {
        margin-top: var(--space-4);
        border-bottom: none;
    }
}

/* ---------- Hero Section ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-32) 0 var(--space-16);
    overflow: hidden;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hero__badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-accent);
    background: rgba(232, 122, 42, 0.1);
    border: 1px solid rgba(232, 122, 42, 0.3);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.8s ease forwards;
}

.hero__title {
    font-size: var(--text-6xl);
    font-weight: 800;
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.8s ease 0.1s forwards;
    opacity: 0;
}

.hero__title--accent {
    color: var(--color-accent);
    display: block;
}

.hero__description {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 500px;
    margin-bottom: var(--space-8);
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

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

.hero__logo-container {
    position: relative;
    animation: fadeIn 1s ease 0.4s forwards;
    opacity: 0;
}

.hero__logo {
    width: 100%;
    max-width: 500px;
    height: auto;
    filter: drop-shadow(0 0 60px var(--color-orange-glow));
    animation: float 6s ease-in-out infinite;
}

.hero__glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 80%;
    height: 80%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--color-orange-glow) 0%, transparent 70%);
    filter: blur(60px);
    z-index: -1;
}

.hero__scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    animation: bounce 2s ease-in-out infinite;
}

@media (max-width: 968px) {
    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero__title {
        font-size: var(--text-4xl);
    }
    
    .hero__description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero__actions {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero__visual {
        order: -1;
    }
    
    .hero__logo {
        max-width: 300px;
    }
}

/* ---------- About Section ---------- */
.about {
    padding: var(--space-32) 0;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 50%, transparent 100%);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-20);
}

.about__content p {
    margin-bottom: var(--space-4);
}

.about__lead {
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    padding: var(--space-12) 0;
    border-top: 1px solid rgba(107, 61, 122, 0.3);
    border-bottom: 1px solid rgba(107, 61, 122, 0.3);
}

.stat {
    text-align: center;
}

.stat__number {
    display: block;
    font-size: var(--text-4xl);
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: var(--space-2);
}

.stat__label {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

@media (max-width: 768px) {
    .about__grid {
        grid-template-columns: 1fr;
    }
    
    .about__stats {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
}

/* ---------- Research Section ---------- */
.research {
    padding: var(--space-32) 0;
}

.research__header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.research__header .section-description {
    margin: 0 auto;
}

.research__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.research-card {
    position: relative;
    padding: var(--space-10);
    background: var(--color-bg-card);
    border: 1px solid rgba(107, 61, 122, 0.3);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    overflow: hidden;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-purple-light), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.research-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-purple-light);
    box-shadow: var(--shadow-lg);
}

.research-card:hover::before {
    opacity: 1;
}

.research-card--featured {
    border-color: var(--color-accent);
}

.research-card--featured::before {
    opacity: 1;
}

.research-card__icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--space-6);
    color: var(--color-accent);
}

.research-card__icon svg {
    width: 100%;
    height: 100%;
}

.research-card__title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.research-card__description {
    font-size: var(--text-base);
    margin-bottom: var(--space-6);
}

.research-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    list-style: none;
}

.research-card__tags li {
    padding: var(--space-1) var(--space-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-accent);
    background: rgba(232, 122, 42, 0.1);
    border-radius: var(--radius-sm);
}

@media (max-width: 968px) {
    .research__grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Approach Section ---------- */
.approach {
    padding: var(--space-32) 0;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 50%, transparent 100%);
}

.approach__header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.approach__timeline {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
    max-width: 900px;
    margin: 0 auto;
}

.approach__item {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-8);
    background: var(--color-bg-card);
    border: 1px solid rgba(107, 61, 122, 0.2);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.approach__item:hover {
    border-color: var(--color-purple-light);
    transform: translateX(8px);
}

.approach__number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-accent);
    background: rgba(232, 122, 42, 0.1);
    border-radius: var(--radius-md);
}

.approach__content h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
}

.approach__content p {
    font-size: var(--text-sm);
}

@media (max-width: 768px) {
    .approach__timeline {
        grid-template-columns: 1fr;
    }
    
    .approach__item:hover {
        transform: translateY(-4px);
    }
}

/* ---------- Technology Section ---------- */
.tech {
    padding: var(--space-32) 0;
}

.tech__header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.tech__categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.tech__category h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    color: var(--color-text-muted);
}

.tech__items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tech__item {
    padding: var(--space-2) var(--space-4);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid rgba(107, 61, 122, 0.2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

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

/* ---------- Contact Section ---------- */
.contact {
    padding: var(--space-32) 0;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 100%);
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.contact__description {
    font-size: var(--text-lg);
    margin-bottom: var(--space-8);
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact__detail {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    color: var(--color-text-secondary);
}

.contact__detail svg {
    flex-shrink: 0;
    color: var(--color-accent);
}

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

.contact__form-container {
    padding: var(--space-10);
    background: var(--color-bg-card);
    border: 1px solid rgba(107, 61, 122, 0.3);
    border-radius: var(--radius-lg);
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: var(--space-4);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    background: rgba(45, 27, 61, 0.5);
    border: 1px solid rgba(107, 61, 122, 0.3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-orange-glow);
}

.form-input::placeholder {
    color: var(--color-gray-500);
}

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

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

/* ---------- Footer ---------- */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-bg-secondary);
    border-top: 1px solid rgba(107, 61, 122, 0.2);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer__brand p {
    margin-top: var(--space-4);
    color: var(--color-text-muted);
}

.footer__links h4 {
    font-size: var(--text-base);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.footer__links ul {
    list-style: none;
}

.footer__links li {
    margin-bottom: var(--space-2);
}

.footer__links a {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

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

.footer__bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(107, 61, 122, 0.2);
    text-align: center;
}

.footer__bottom p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .footer__grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Scroll animations */
.fade-in-section {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* ---------- Print Styles ---------- */
@media print {
    #network-bg,
    .nav,
    .hero__scroll-indicator,
    .contact__form-container {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}