:root {
    --color-primary: #bad1cd;
    --color-cyan: #2ee1f2;
    --color-pink: #e086d3;
    --color-orange: #e0ac86;
    --color-gray: #999999;
    --color-purple: #8332ac;
    --color-white: #ffffff;

    --bg-color: var(--color-primary);
    --card-bg: #f2d1c9;
    --card-text: #1a1a1a;
    --link-color: var(--color-purple);
    --focus-outline: var(--color-purple);
    --icon-color: #1a1a1a;

    --button-flip-bg: #93cca7;
    --button-flip-shadow: #689079;
    --button-flip-hover-bg: var(--color-white);
    --button-flip-active-bg: rgb(175, 205, 207);

    --swatch-border: var(--color-white);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #1f2e2b;
        --color-cyan: #134e56;
        --color-pink: #522b4b;
        --color-orange: #593c2a;
        --color-gray: #444444;

        --bg-color: #12181b;
        --card-bg: #2a2648;
        --card-text: #f0f4f8;
        --link-color: #c084fc;
        --focus-outline: #c084fc;
        --icon-color: #f0f4f8;

        --button-flip-bg: #2d5a3f;
        --button-flip-shadow: #173323;
        --button-flip-hover-bg: #3e7353;
        --button-flip-active-bg: #234530;

        --swatch-border: #383838;
    }
}

[data-theme="dark"],
body.dark-mode {
    --color-primary: #1f2e2b;
    --color-cyan: #134e56;
    --color-pink: #522b4b;
    --color-orange: #593c2a;
    --color-gray: #444444;

    --bg-color: #12181b;
    --card-bg: #2a2648;
    --card-text: #f0f4f8;
    --link-color: #c084fc;
    --focus-outline: #c084fc;
    --icon-color: #f0f4f8;

    --button-flip-bg: #2d5a3f;
    --button-flip-shadow: #173323;
    --button-flip-hover-bg: #3e7353;
    --button-flip-active-bg: #234530;

    --swatch-border: #747474;
}

[data-theme="light"],
body.light-mode {
    --color-primary: #bad1cd;
    --color-cyan: #2ee1f2;
    --color-pink: #e086d3;
    --color-orange: #e0ac86;
    --color-gray: #999999;
    --color-purple: #8332ac;
    --color-white: #ffffff;

    --bg-color: var(--color-primary);
    --card-bg: #f2d1c9;
    --card-text: #1a1a1a;
    --link-color: var(--color-purple);
    --focus-outline: var(--color-purple);
    --icon-color: #1a1a1a;

    --button-flip-bg: #93cca7;
    --button-flip-shadow: #689079;
    --button-flip-hover-bg: #ffffff;
    --button-flip-active-bg: rgb(175, 205, 207);

    --swatch-border: #ffffff;
}

.feather,
svg.feather {
    stroke: var(--icon-color, currentColor);
    transition: stroke 0.3s ease;
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--card-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

*,
*::after,
*::before {
    box-sizing: border-box;
}

/* macOS-style Dock Navigation (BEM Methodology) */
.dock {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
}

.dock__container {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.35);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: 9999px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="dark"] .dock__container,
body.dark-mode .dock__container {
    background: rgba(25, 25, 35, 0.55);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45), 0 2px 10px rgba(0, 0, 0, 0.25);
}

.dock__button {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--icon-color);
    cursor: pointer;
    box-sizing: border-box;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.2s ease, color 0.3s ease;
}

@media (hover: hover) {
    .dock__button:hover {
        background: var(--button-flip-hover-bg);
        transform: translateY(-4px) scale(1.15);
    }
}

.dock__button:active {
    background: var(--button-flip-active-bg);
    transform: translateY(-1px) scale(1.02);
}

.dock__icon {
    width: 20px;
    height: 20px;
    stroke: var(--icon-color, currentColor);
    transition: stroke 0.3s ease;
}

:focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 3px;
}

.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;
}

section {
    perspective: 1000px;
}

.page {
    position: relative;
    top: 30vh;
    left: 60%;
    width: 40%;

    font-family: system-ui;
    transform-style: preserve-3d;
    transition: transform cubic-bezier(0.4, 0, 0.2, 1) 0.5s;
}

@media (max-width: 1024px) {
    .page {
        left: 10%;
        width: 90%;
    }
}

.page.flipped {
    transform: rotateY(180deg);
}

.page-front {
    position: relative;
    width: 100%;
    padding: 20px;
    background: var(--card-bg);
    color: var(--card-text);
    transform: rotateY(0deg);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.page-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 20px;
    background: var(--card-bg);
    color: var(--card-text);
    transform: rotateY(180deg);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.link,
.page a {
    display: block;
    margin-top: 5px;

    color: var(--link-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.colors-box {
    display: flex;
    gap: 8px;
}

.colors-box__item {
    width: 36px;
    height: 36px;
    border: 4px solid var(--swatch-border);
    transition: ease-out 0.5s, border-color 0.3s ease;
    cursor: pointer;
}

@media (hover: hover) {
    .colors-box__item:hover {
        transform: scale(1.1);
        transition: ease-out 0.2s;
    }
}

.colors-box__item--primary {
    background-color: var(--color-primary);
}

.colors-box__item--cyan {
    background-color: var(--color-cyan);
}

.colors-box__item--pink {
    background-color: var(--color-pink);
}

.colors-box__item--orange {
    background-color: var(--color-orange);
}

.colors-box__item--gray {
    background-color: var(--color-gray);
}