/* ============================================================
   GLOBAL.CSS — Design System, Reset, Typography, Layout
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* --- CSS Custom Properties --- */
:root {
    /* Colors */
    --bg: #0a0a0f;
    --bg-rgb: 10, 10, 15;
    --surface: #12121a;
    --surface-2: #1a1a2e;
    --surface-3: #22223a;
    --border: #2a2a3e;
    --border-light: #3a3a52;

    --text: #e0e0e8;
    --text-muted: #8888a0;
    --text-dim: #555570;
    --heading: #f0f0f8;

    --accent: #6c63ff;
    --accent-rgb: 108, 99, 255;
    --accent-glow: #8b83ff;
    --accent-dark: #4a42d4;
    --accent-2: #00d4aa;
    --accent-2-rgb: 0, 212, 170;
    --accent-2-dark: #00b894;

    --danger: #ff6b6b;
    --warning: #ffd93d;
    --info: #54a0ff;
    --success: #00d4aa;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
    --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
    --fs-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
    --fs-md: clamp(1rem, 0.9rem + 0.5vw, 1.15rem);
    --fs-lg: clamp(1.15rem, 1rem + 0.75vw, 1.4rem);
    --fs-xl: clamp(1.4rem, 1.1rem + 1.5vw, 2rem);
    --fs-2xl: clamp(1.8rem, 1.3rem + 2.5vw, 2.8rem);
    --fs-3xl: clamp(2.2rem, 1.5rem + 3.5vw, 3.8rem);
    --fs-4xl: clamp(2.8rem, 1.8rem + 5vw, 5rem);

    --fw-light: 300;
    --fw-regular: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;
    --fw-black: 900;

    --lh-tight: 1.2;
    --lh-normal: 1.6;
    --lh-relaxed: 1.8;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Borders & Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(var(--accent-rgb), 0.15);
    --shadow-glow-strong: 0 0 40px rgba(var(--accent-rgb), 0.25);

    /* Transitions */
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
    --duration-slower: 800ms;

    /* Layout */
    --nav-height: 70px;
    --container-max: 1600px;
    --container-medium: 1200px;
    --container-narrow: 900px;
    --sidebar-width: 300px;

    /* Animated Grid */
    --grid-size: 40px;
    --grid-color: rgba(var(--accent-rgb), 0.07);
    --grid-speed: 15s;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    font-weight: var(--fw-regular);
    line-height: var(--lh-normal);
    color: var(--text);
    background-color: var(--bg);
    /* Anti-aliasing */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

main {
    flex: 1 0 auto;
}

/* Selection */
::selection {
    background: rgba(var(--accent-rgb), 0.3);
    color: var(--heading);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--heading);
    font-weight: var(--fw-bold);
    line-height: var(--lh-tight);
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--fs-3xl);
}

h2 {
    font-size: var(--fs-2xl);
}

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

h4 {
    font-size: var(--fs-lg);
}

h5 {
    font-size: var(--fs-md);
}

h6 {
    font-size: var(--fs-base);
}

p {
    margin-bottom: var(--space-md);
    color: var(--text-muted);
    line-height: var(--lh-relaxed);
}

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

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

strong {
    font-weight: var(--fw-semibold);
    color: var(--text);
}

em {
    font-style: italic;
}

code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--surface-2);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
    color: var(--accent-glow);
}

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

ul,
ol {
    list-style: none;
}

button,
input,
textarea,
select {
    font: inherit;
    color: inherit;
    border: none;
    outline: none;
    background: none;
}

button {
    cursor: pointer;
}

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

.container--narrow {
    max-width: var(--container-narrow);
}

.container--medium {
    max-width: var(--container-medium);
}

.section {
    padding: var(--space-5xl) 0;
    position: relative;
}

/* --- Backgrounds --- */
.bg-grid-animated {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    z-index: -2;
    pointer-events: none;
}

.bg-grid-animated::before {
    content: '';
    position: absolute;
    inset: -100%;
    width: 300%;
    height: 300%;
    background-image:
        linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    mask-image: radial-gradient(circle at center, black, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black, transparent 80%);
    animation: grid-move var(--grid-speed) linear infinite;
}

@keyframes grid-move {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(calc(var(--grid-size) * -1), calc(var(--grid-size) * -1));
    }
}

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

/* Flex utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-wrap {
    flex-wrap: wrap;
}

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

.items-start {
    align-items: flex-start;
}

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

.justify-between {
    justify-content: space-between;
}

.gap-xs {
    gap: var(--space-xs);
}

.gap-sm {
    gap: var(--space-sm);
}

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

.gap-xl {
    gap: var(--space-xl);
}

.gap-2xl {
    gap: var(--space-2xl);
}

/* Grid */
.grid {
    display: grid;
    gap: var(--space-xl);
}

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

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Text utilities */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.text-accent {
    color: var(--accent);
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Section label */
.section-label {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.section-label::before {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: var(--radius-full);
}

.section-title {
    font-size: var(--fs-2xl);
    margin-bottom: var(--space-md);
}

.section-desc {
    font-size: var(--fs-md);
    color: var(--text-muted);
    max-width: 600px;
    line-height: var(--lh-relaxed);
}

/* Section divider */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin: 0;
    border: none;
}

/* --- 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;
    }

    html {
        scroll-behavior: auto;
    }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
    }

    .container {
        padding: 0 var(--space-lg);
    }

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

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
}