/* ==========================================================================
   Delsys e.U. - Landing Page Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #0ea5e9;
    --color-accent: #f59e0b;

    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-gray-950: #030712;

    --color-white: #ffffff;
    --color-black: #000000;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    --gradient-text: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    --gradient-dark: linear-gradient(180deg, var(--color-gray-900) 0%, var(--color-gray-950) 100%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-glow: 0 0 40px rgb(99 102 241 / 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-smooth: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --container-max: 1200px;
    --nav-height: 80px;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*,
*::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-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
}

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

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

ul {
    list-style: none;
}

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

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

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

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-gray-900);
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-4xl);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-xl);
}

.gradient-text {
    background: var(--gradient-text);
    -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-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md), 0 0 0 0 rgb(99 102 241 / 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgb(99 102 241 / 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    color: var(--color-gray-700);
    border: 2px solid var(--color-gray-200);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgb(99 102 241 / 0.05);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-base);
    border-radius: var(--radius-xl);
}

.btn-full {
    width: 100%;
}

/* --------------------------------------------------------------------------
   Section Tags
   -------------------------------------------------------------------------- */
.section-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    background: rgb(99 102 241 / 0.1);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header p {
    margin-top: var(--spacing-md);
    color: var(--color-gray-500);
    font-size: var(--font-size-lg);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-100);
    z-index: 1000;
}

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

.logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-gray-900);
}

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

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: 0.625rem 1.25rem;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    padding-top: calc(var(--nav-height) + var(--spacing-4xl));
    padding-bottom: var(--spacing-4xl);
    background: var(--gradient-dark);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary-light);
    background: rgb(99 102 241 / 0.15);
    border: 1px solid rgb(99 102 241 / 0.3);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-lg);
}

.hero h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-2xl);
    max-width: 480px;
}

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

.hero .btn-outline {
    border-color: var(--color-gray-600);
    color: var(--color-gray-300);
}

.hero .btn-outline:hover {
    border-color: var(--color-primary-light);
    color: var(--color-white);
    background: rgb(99 102 241 / 0.1);
}

/* Code Window */
.hero-visual {
    display: flex;
    justify-content: center;
}

.code-window {
    background: var(--color-gray-800);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
    width: 100%;
    max-width: 480px;
    border: 1px solid var(--color-gray-700);
}

.window-header {
    display: flex;
    gap: 8px;
    padding: var(--spacing-md);
    background: var(--color-gray-900);
    border-bottom: 1px solid var(--color-gray-700);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #22c55e; }

.window-content {
    padding: var(--spacing-xl);
}

.window-content code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.8;
    color: var(--color-gray-300);
}

.code-keyword { color: #c084fc; }
.code-var { color: #60a5fa; }
.code-string { color: #34d399; }
.code-func { color: #fbbf24; }

/* --------------------------------------------------------------------------
   Services Section
   -------------------------------------------------------------------------- */
.services {
    padding: var(--spacing-4xl) 0;
    background: var(--color-gray-50);
}

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

.service-card {
    background: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-gray-100);
    transition: all var(--transition-smooth);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
}

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

.service-card p {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about {
    padding: var(--spacing-4xl) 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-content h2 {
    margin-bottom: var(--spacing-lg);
}

.about-content > p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

.about-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-gray-700);
    font-weight: 500;
}

.about-list svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

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

.stat-card {
    background: var(--gradient-dark);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
}

/* --------------------------------------------------------------------------
   Tech Stack Section
   -------------------------------------------------------------------------- */
.tech-stack {
    padding: var(--spacing-4xl) 0;
    background: var(--color-gray-50);
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.tech-item {
    padding: 0.75rem 1.5rem;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    transition: all var(--transition-base);
}

.tech-item:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgb(99 102 241 / 0.05);
    transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact {
    padding: var(--spacing-4xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-info h2 {
    margin-bottom: var(--spacing-lg);
}

.contact-info > p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-gray-600);
}

.contact-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-item a:hover {
    color: var(--color-primary);
}

/* Contact Form */
.contact-form {
    background: var(--color-gray-50);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--color-gray-100);
}

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

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    color: var(--color-gray-900);
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-400);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

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

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background: var(--gradient-dark);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-800);
    margin-bottom: var(--spacing-xl);
}

.footer-brand .logo {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.footer-brand p {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

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

.footer-links a {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
    }

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

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile Landscape */
@media (max-width: 768px) {
    .nav-links,
    .nav-cta {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin: 0 auto var(--spacing-2xl);
    }

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

    .hero-visual {
        order: -1;
    }

    .code-window {
        max-width: 100%;
    }

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

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

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

/* Mobile Portrait */
@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --spacing-4xl: 4rem;
    }

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

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

    .stat-card {
        padding: var(--spacing-lg);
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-visual {
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* Scroll reveal animation classes (to be triggered by JS) */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Cookie Banner
   -------------------------------------------------------------------------- */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-gray-900);
    padding: var(--spacing-lg);
    z-index: 10000;
    transform: translateY(100%);
    transition: transform var(--transition-smooth);
    border-top: 1px solid var(--color-gray-700);
}

.cookie-banner.visible {
    transform: translateY(0);
}

.cookie-banner.hidden {
    display: none;
}

.cookie-content {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.cookie-content p {
    color: var(--color-gray-300);
    font-size: var(--font-size-sm);
    margin: 0;
    flex: 1;
    min-width: 280px;
}

.cookie-content a {
    color: var(--color-primary-light);
}

.cookie-content a:hover {
    text-decoration: underline;
}

.cookie-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.cookie-buttons .btn {
    padding: 0.5rem 1.25rem;
    font-size: var(--font-size-sm);
}

.cookie-buttons .btn-outline {
    border-color: var(--color-gray-600);
    color: var(--color-gray-300);
}

.cookie-buttons .btn-outline:hover {
    border-color: var(--color-gray-400);
    color: var(--color-white);
    background: transparent;
}

@media (max-width: 480px) {
    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-buttons {
        width: 100%;
    }

    .cookie-buttons .btn {
        flex: 1;
    }
}