/* css/base.css */
/* ==========================================================================
    Global Styles, Resets, Utilities & Layout
   ========================================================================== */
/* Resets & Global Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Source Code Pro", Menlo, Consolas, Monaco, "Liberation Mono", "Lucida Console", monospace;
    font-size: 16px;
    background-color: var(--color-bg-checkerboard);
    transition: background-color 0.8s ease-out;
    background-size: var(--size-checkerboard) var(--size-checkerboard);
    background-position: 0 0, 0 calc(var(--size-checkerboard) / 2), calc(var(--size-checkerboard) / 2) calc(var(--size-checkerboard) / -2), calc(var(--size-checkerboard) / -2) 0px;
    background-image: linear-gradient(45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(-45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--color-checkerboard-pattern) 75%), linear-gradient(-45deg, transparent 75%, var(--color-checkerboard-pattern) 75%);
}

body {
    align-items: center;
    background: transparent;
    color: var(--color-text-page);
    display: flex;
    flex-direction: column;
    margin: 0;
    min-height: 100%;
    padding: 20px;
    transition: color 0.3s ease;
    width: 100%;
}

h1 {
    font-size: 1.8em;
    letter-spacing: 0.1em;
    margin: 20px auto 40px;
    text-transform: uppercase;
}

.block-letter {
    background-color: transparent;
    border-radius: var(--radius-global);
    box-shadow: 1px 1px 3px var(--shadow-default);
    color: var(--text-block-letter-on-light);
    display: inline-block;
    font-weight: bold;
    line-height: 1.1;
    margin: 0.05em 0.1em;
    min-width: 1em;
    padding: 0.15em 0.35em;
    text-align: center;
    text-transform: uppercase;
    transition: color 0.4s ease-in-out, background-color 0.4s ease-in-out;
    user-select: none;
    vertical-align: middle;
}

.block-letter.h1-space {
    background-color: transparent !important;
    box-shadow: none !important;
    color: transparent !important;
}

button,
input,
form,
label,
select,
textarea {
    font-size: inherit;
    font-family: inherit;
}

/* Utility Classes */
.checkerboard-element {
    position: absolute;
    inset: 0;
    background-size: var(--size-checkerboard) var(--size-checkerboard);
    background-position: 0 0, 0 calc(var(--size-checkerboard) / 2), calc(var(--size-checkerboard) / 2) calc(var(--size-checkerboard) / -2), calc(var(--size-checkerboard) / -2) 0px;
    z-index: 1;
    background-image: linear-gradient(45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(-45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--color-checkerboard-pattern) 75%), linear-gradient(-45deg, transparent 75%, var(--color-checkerboard-pattern) 75%);
    background-color: var(--color-bg-checkerboard);
}

.color-overlay-element {
    position: absolute;
    inset: 0;
    z-index: 2;
}

.visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

/* Main Layout */
.app-wrapper {
    display: flex;
    flex-direction: column;
    gap: 25px;
    width: 100%;
    max-width: 1200px;
}

.main-controls-wrapper {
    align-items: flex-start;
    display: flex;
    flex-direction: row;
    gap: 25px;
    width: 100%;
}

.main-controls-wrapper > .panel {
    flex: 1;
    min-width: 0;
}