/* ==========================================================================
   NovaStack Design System
   Global styles, CSS variables, typography, layout, animations
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@400;500;600;700&display=swap');

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

/* --- Design Tokens --- */
:root {
    /* Primary - Electric Indigo/Violet */
    --primary-50: #EEE5FF;
    --primary-100: #D4BFFF;
    --primary-200: #B794FF;
    --primary-300: #9B6DFF;
    --primary-400: #8450FF;
    --primary-500: #6D33FF;
    --primary-600: #5A1FE6;
    --primary-700: #4712CC;

    /* Accent - Cyan/Electric Blue */
    --accent-50: #E0FCFF;
    --accent-100: #BEF8FD;
    --accent-200: #87EAF2;
    --accent-300: #54D1DB;
    --accent-400: #38BEC9;
    --accent-500: #00B4D8;

    /* Neutral - Cool Gray */
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --gray-950: #020617;

    /* Background - Deep Dark */
    --bg-primary: #050510;
    --bg-secondary: #0A0A1A;
    --bg-tertiary: #111128;
    --bg-glass: rgba(255, 255, 255, 0.03);

    /* Text */
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #6D33FF 0%, #00B4D8 100%);
    --gradient-glow: linear-gradient(135deg, rgba(109, 51, 255, 0.15) 0%, rgba(0, 180, 216, 0.15) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.01) 100%);

    /* Effects */
    --glow-primary: 0 0 40px rgba(109, 51, 255, 0.3);
    --glow-accent: 0 0 40px rgba(0, 180, 216, 0.3);
    --border-subtle: 1px solid rgba(255, 255, 255, 0.06);

    /* Spacing */
    --section-padding: clamp(3rem, 5vw, 5rem);
    --container-max: 1200px;
    --container-padding: clamp(1rem, 4vw, 2rem);

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Base Styles --- */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.nav-open {
    overflow: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Space Grotesk', sans-serif;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1.1;
}

h2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.15;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    line-height: 1.25;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
}

.lead {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    line-height: 1.6;
    color: var(--text-secondary);
}

/* --- Links --- */
a {
    color: var(--primary-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-200);
}

/* --- Selection --- */
::selection {
    background: rgba(109, 51, 255, 0.3);
    color: var(--text-primary);
}

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

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

.section {
    padding-top: var(--section-padding);
    padding-bottom: var(--section-padding);
    position: relative;
}

.section__title {
    text-align: center;
    margin-bottom: 1rem;
}

.section__subtitle {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 2.5rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    line-height: 1;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-brand);
    color: #fff;
    box-shadow: 0 4px 20px rgba(109, 51, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(109, 51, 255, 0.4);
    color: #fff;
}

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

.btn:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(4px);
}

.btn-outline:hover {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::after {
    content: '';
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: 0.5rem;
}

/* --- Gradient Text --- */
.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Flash Messages --- */
.flash-message {
    max-width: var(--container-max);
    margin: 1rem auto;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    position: relative;
}

.flash-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.2);
    color: #4ade80;
}

.flash-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #f87171;
}

/* --- Skip Nav (Accessibility) --- */
.skip-nav {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 10000;
    padding: 0.75rem 1.5rem;
    background: var(--primary-500);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: top var(--transition-fast);
}

.skip-nav:focus {
    top: 1rem;
    color: #fff;
}

/* --- Dot Grid Background Pattern --- */
.dot-bg {
    position: relative;
}

.dot-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
    z-index: 0;
}

/* --- Animation Keyframes --- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* --- Scroll Reveal --- */
.js .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* --- Legal Page Styles --- */
.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--section-padding) var(--container-padding);
}

.legal-content h1 {
    margin-bottom: 0.5rem;
}

.legal-content .legal-date {
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-size: 0.9rem;
}

.legal-content h2 {
    font-size: clamp(1.3rem, 2.5vw, 1.75rem);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.legal-content p {
    margin-bottom: 1rem;
}

.legal-content ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
}

.legal-content a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* --- Responsive Breakpoints --- */
/* sm: 640px+ */
@media (min-width: 640px) {
    .section__subtitle {
        font-size: 1.15rem;
    }
}

/* md: 768px+ */
@media (min-width: 768px) {
    .btn {
        padding: 1rem 2.25rem;
    }
}

/* lg: 1024px+ */
@media (min-width: 1024px) {
    /* Layout adjustments for desktop handled in component CSS */
}

/* xl: 1280px+ */
@media (min-width: 1280px) {
    :root {
        --container-max: 1280px;
    }
}

/* --- Accessibility: Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .js .reveal {
        opacity: 1;
        transform: none;
    }
}