:root {
    --font-family: "Open Sans", sans-serif;

    --text-size: 16px;
    --line-height: 1.6;
    --letter-spacing: 0px;
    --content-width: 800px;
    --para-indent: 0;
    --para-margin: 1em;

    --bg-color: #fdfdfd;
    --text-color: #333;
    --accent-color: #333;
    --menu-bg: #f5f5f7;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-color: #e0e0e0;
    --hover-bg: rgba(0, 0, 0, 0.05);
    --input-bg: #fff;
}

[data-theme="dark"] {
    --bg-color: #222222;
    --menu-bg: #2d2d2d;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --border-color: #444;
    --accent-color: #fff;
    --hover-bg: rgba(255, 255, 255, 0.1);
    --input-bg: #333;
}

[data-theme="sepia"] {
    --bg-color: #f4ecd8;
    --menu-bg: #fff9ea;
    --border-color: #dccfb7;
    --accent-color: #5b4636;
    --hover-bg: rgba(91, 70, 54, 0.1);
    --input-bg: #fffbf0;
}

[data-theme="midnight"] {
    --bg-color: #2b323b;
    --menu-bg: #36404a;
    --text-color: #c4cdd5;
    --border-color: #4a5563;
    --accent-color: #8ab4f8;
    --hover-bg: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.4);
    --input-bg: #2b323b;
}

[data-theme="forest"] {
    --bg-color: #e8f5e9;
    --menu-bg: #dceddc;
    --text-color: #2d3b2d;
    --border-color: #b8daba;
    --accent-color: #2e7d32;
    --hover-bg: rgba(46, 125, 50, 0.1);
    --shadow-color: rgba(45, 59, 45, 0.15);
    --input-bg: #e8f5e9;
}

[data-theme="amoled"] {
    --bg-color: #000000;
    --menu-bg: #1a1a1a;
    --text-color: #b3b3b3;
    --border-color: #333333;
    --accent-color: #ffffff;
    --hover-bg: rgba(255, 255, 255, 0.15);
    --shadow-color: rgba(255, 255, 255, 0.1);
    --input-bg: #000;
}

* {
    box-sizing: border-box;
}

html {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
    scroll-behavior: smooth;
}

::selection {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

::-moz-selection {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 20px;
    border: 2px solid transparent;
    background-clip: content-box;
}

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

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: "Open Sans", sans-serif;
    transition:
        width 0.1s ease-in-out,
        background-color 0.2s ease-in-out,
        color 0.2s ease-in-out;
}

a {
    text-decoration: none;
    color: inherit;
}

.ui-button {
    padding: 10px 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition:
        transform 0.1s,
        background-color 0.2s;
    font: inherit;
    text-decoration: none;
}

.ui-button:active,
.action-btn:active {
    transform: scale(0.95);
}

.fab-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    pointer-events: none;
    transition:
        transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
        opacity 0.3s ease;
    opacity: 1;
    gap: 20px;
}

.fab-container.fab-hidden {
    transform: translateY(100px);
    opacity: 0;
}

.settings-btn {
    background-color: var(--text-color);
    color: var(--bg-color);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    box-shadow: 0 4px 12px var(--shadow-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: auto;
}

.settings-btn:hover {
    transform: scale(1.1);
}

.settings-btn svg {
    fill: var(--bg-color);
    width: 24px;
    height: 24px;
}

.settings-menu {
    background: var(--menu-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 16px;
    margin-bottom: 16px;
    box-shadow: 0 10px 40px -10px var(--shadow-color);
    width: 340px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.98);
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform-origin: bottom right;
    pointer-events: auto;
}

.settings-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.setting-item label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
    color: var(--text-color);
}

.value-display {
    font-size: 13px;
    font-weight: bold;
    color: var(--text-color);
}

.segmented-control {
    display: flex;
    background-color: var(--input-bg, var(--bg-color));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    width: 100%;
    width: fit-content;
}

.segment-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 36px;
    height: 36px;
    padding: 10 12px;
    background: transparent;
    color: var(--text-color);
    border: none;
    cursor: pointer;
    font-size: 18px;
    font-family: inherit;
    font-weight: 600;
    transition:
        background-color 0.2s,
        color 0.2s;
}

.segment-btn:not(:last-child) {
    border-right: 1px solid var(--border-color);
}

.segment-btn.active {
    background-color: var(--text-color);
    color: var(--bg-color);
}

.segment-btn svg {
    width: 16px;
    height: 16px;
    transition: fill 0.2s;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.setting-row .setting-item {
    margin-bottom: 0;
}

.control-input {
    width: 100%;
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg, var(--bg-color));
    color: var(--text-color);
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.2s;
}

.control-input:focus {
    outline: none;
    border-color: var(--text-color);
    box-shadow: 0 0 0 2px var(--shadow-color);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
    cursor: pointer;
}

input[type="range"]:focus {
    outline: none;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: var(--border-color);
    border-radius: 3px;
}

input[type="range"]::-webkit-slider-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--text-color);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: "▼";
    font-size: 10px;
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-color);
}

select {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-color);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: border-color 0.2s;
}

select option {
    background-color: var(--menu-bg);
    color: var(--text-color);
}

select:hover,
select:focus {
    border-color: var(--text-color);
}

select:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--shadow-color);
}

.theme-selector {
    display: flex;
    gap: 12px;
    background: var(--border-color);
    padding: 6px;
    border-radius: 50px;
    width: fit-content;
}

.theme-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.theme-btn.active {
    transform: scale(1.1);
    border-color: var(--text-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

@media (max-width: 600px) {
    body {
        padding-top: 20px;
    }
}