/* ==========================================================================
   CoreSync Private — Base Styles
   Variables, reset, typography
   ========================================================================== */

:root {
    /* Color palette — dark cinematic */
    --color-bg: #0a0a0a;
    --color-surface: rgba(255, 255, 255, 0.04);
    --color-glass: rgba(255, 255, 255, 0.06);
    --color-glass-border: rgba(255, 255, 255, 0.1);
    --color-text-primary: rgba(255, 255, 255, 0.92);
    --color-text-secondary: rgba(255, 255, 255, 0.55);
    --color-text-muted: rgba(255, 255, 255, 0.35);
    --color-accent: rgba(255, 255, 255, 0.8);
    --color-overlay: rgba(0, 0, 0, 0.5);

    /* Typography */
    --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.5rem;
    --text-2xl: 2rem;
    --text-3xl: 2.75rem;
    --text-4xl: 3.5rem;

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

    --tracking-tight: -0.02em;
    --tracking-normal: 0;
    --tracking-wide: 0.05em;
    --tracking-wider: 0.12em;

    /* 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;

    /* Glass panel */
    --glass-blur: 24px;
    --glass-bg: rgba(12, 12, 12, 0.75);
    --glass-border: 1px solid rgba(255, 255, 255, 0.08);
    --glass-radius: 16px;

    /* Z-index layers */
    --z-background: 0;
    --z-mood-overlay: 1;
    --z-scroll-text: 10;
    --z-panel: 100;
    --z-concierge: 200;
    --z-fixed-ui: 300;

    /* Transitions */
    --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
    --duration-fast: 200ms;
    --duration-normal: 400ms;
    --duration-slow: 800ms;
    --duration-mood: 3000ms;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    overflow-x: hidden;
    min-height: 100vh;
}

body.is-panel-open {
    overflow: hidden;
}

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

a:hover {
    opacity: 0.7;
}

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

input,
textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: transparent;
    border: var(--glass-border);
    border-radius: 8px;
    padding: var(--space-sm) var(--space-md);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.25);
}

/* Utility: visually hidden (a11y) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}