/* ==========================================
   ISA - Intelligent Solutions Agency
   Premium Brand CSS Framework
   ========================================== */

/* Brand Colors - From ISA Premium Brand Package */
:root {
    /* Primary Colors */
    --isa-black: #0A0A0A;
    --isa-white: #FAFAFA;
    
    /* Premium Gradient Colors */
    --isa-cyan: #00D4FF;
    --isa-purple: #8B5CF6;
    --isa-success: #10F99F;
    
    /* Gradient Definitions */
    --isa-gradient: linear-gradient(135deg, #00D4FF 0%, #8B5CF6 100%);
    --isa-gradient-reverse: linear-gradient(135deg, #8B5CF6 0%, #00D4FF 100%);
    --isa-gradient-radial: radial-gradient(circle, #00D4FF 0%, #8B5CF6 100%);
    
    /* Text Colors */
    --text-primary: #FAFAFA;
    --text-secondary: #B8F3FF;
    --text-muted: #9CA3AF;
    --text-dark: #6B7280;
    
    /* Background Variants */
    --bg-primary: #0A0A0A;
    --bg-secondary: rgba(10, 10, 10, 0.95);
    --bg-card: rgba(255, 255, 255, 0.02);
    --bg-card-hover: rgba(255, 255, 255, 0.05);
    
    /* Border Colors */
    --border-primary: rgba(255, 255, 255, 0.05);
    --border-secondary: rgba(255, 255, 255, 0.1);
    --border-cyan: rgba(0, 212, 255, 0.3);
    --border-purple: rgba(139, 92, 246, 0.3);
    
    /* Shadow Definitions */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --shadow-cyan: 0 10px 30px rgba(0, 212, 255, 0.3);
    --shadow-purple: 0 10px 30px rgba(139, 92, 246, 0.3);
    --shadow-premium: 0 10px 40px rgba(0, 212, 255, 0.2);
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* 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;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-tooltip: 600;
    --z-notification: 700;
}

/* ==================== Base Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(3rem, 7vw, 6rem);
}

h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h3 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h4 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h5 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h6 {
    font-size: clamp(1rem, 2vw, 1.25rem);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--isa-cyan);
    text-decoration: none;
    transition: all var(--transition-base);
}

a:hover {
    color: var(--isa-purple);
}

/* ==================== Utility Classes ==================== */
.gradient-text {
    background: var(--isa-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.gradient-bg {
    background: var(--isa-gradient);
}

.glassmorphism {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
}

.premium-shadow {
    box-shadow: var(--shadow-premium);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section {
    padding: var(--spacing-3xl) 0;
}

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--isa-gradient);
    color: var(--isa-black);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-cyan);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--isa-cyan);
    border: 2px solid var(--isa-cyan);
}

.btn-outline:hover {
    background: var(--isa-cyan);
    color: var(--isa-black);
}

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

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.75rem;
}

/* ==================== Cards ==================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--isa-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--border-cyan);
    box-shadow: var(--shadow-cyan);
}

.card:hover::before {
    transform: scaleX(1);
}

/* ==================== Forms ==================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    outline: none;
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--isa-cyan);
    background: rgba(0, 212, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

/* ==================== Navigation ==================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: var(--bg-secondary);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-primary);
    transition: all var(--transition-base);
}

.nav.scrolled {
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.nav-logo {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--spacing-2xl);
    list-style: none;
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    transition: all var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--isa-gradient);
    transition: width var(--transition-base);
}

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

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

.nav-cta {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--isa-gradient);
    border-radius: var(--radius-md);
    color: var(--isa-black) !important;
    font-weight: 700;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-cyan);
}

/* ==================== Footer ==================== */
.footer {
    background: rgba(0, 0, 0, 0.5);
    border-top: 1px solid var(--border-primary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand-logo {
    height: 50px;
    width: auto;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--text-muted);
    max-width: 300px;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--isa-gradient);
    border-color: transparent;
    color: var(--isa-black);
    transform: translateY(-3px);
}

.footer-column h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--isa-cyan);
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-link {
    color: var(--text-muted);
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--isa-cyan);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: var(--text-dark);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
}

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

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* Animated Elements */
.animate-fadeIn {
    animation: fadeIn var(--transition-slow) ease forwards;
}

.animate-fadeInUp {
    animation: fadeInUp var(--transition-slow) ease forwards;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-gradient {
    background-size: 200% 200%;
    animation: gradient-shift 3s ease infinite;
}

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

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .nav-links {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .btn {
        width: 100%;
    }
}

/* ==================== Special Effects ==================== */
.glow-cyan {
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.glow-purple {
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

.text-glow {
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

/* Particle Canvas */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* Loading Animation */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-secondary);
    border-top-color: var(--isa-cyan);
    border-radius: 50%;
    animation: rotate 1s linear infinite;
}

/* Success Check Animation */
.success-check {
    width: 60px;
    height: 60px;
    background: var(--isa-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--isa-black);
    font-size: 1.5rem;
    animation: pulse var(--transition-slow) ease;
}