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

/* ================================
   ROOT TOKENS
================================ */
:root {
    /* Colours */
    --color-background-base: #111111;
    --color-background-surface: #1A1A1A;
    --color-background-subtle: #2A2A2A;

    --color-text-primary: #F5F5F5;
    --color-text-secondary: #AAAAAA;
    --color-text-disabled: #666666;

    --color-border-default: #2A2A2A;
    --color-border-strong: #666666;

    --color-interactive-default: #F5F5F5;
    --color-interactive-hover: #CCCCCC;
    --color-interactive-focus: #FFFFFF;

    /* Typography */
    --font-family-base: 'Noto Sans', sans-serif;

    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-md: 18px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-2xl: 30px;
    --font-size-3xl: 36px;
    --font-size-4xl: 48px;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-snug: 1.3;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.6;
    --line-height-loose: 1.75;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;

    /* Layout */
    --max-content: 1200px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
}

/* ================================
   BASE STYLES
================================ */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-primary);
    background-color: var(--color-background-base);
    -webkit-font-smoothing: antialiased;
}

/* ================================
   FOCUS STYLES (Accessibility)
================================ */
:focus-visible {
    outline: 2px solid var(--color-interactive-focus);
    outline-offset: 3px;
}

/* ================================
   TYPOGRAPHY
================================ */
h1, h2, h3, h4 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-2xl); line-height: var(--line-height-snug); }
h3 { font-size: var(--font-size-xl);  line-height: var(--line-height-snug); font-weight: var(--font-weight-semibold); }
h4 { font-size: var(--font-size-lg);  line-height: var(--line-height-normal); font-weight: var(--font-weight-semibold); }

p {
    max-width: 65ch;
    color: var(--color-text-primary);
}

/* ================================
   LAYOUT
================================ */
.container {
    width: 100%;
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 0 var(--space-8);
}

/* ================================
   REDUCED MOTION
================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ================================
   MOBILE
================================ */
@media (max-width: 768px) {
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }

    .container {
        padding: 0 var(--space-4);
    }
}