:root {
    --bg-primary: #121215;
    --bg-surface: #18181c;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #808090;
    --accent-color: #60a5fa;
    --accent-hover: #93c5fd;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.5);

    --toggle-bg: rgba(255, 255, 255, 0.08);
    --toggle-border: rgba(255, 255, 255, 0.12);
    --toggle-active-bg: rgba(255, 255, 255, 0.18);
    --toggle-active-text: #ffffff;
    --toggle-inactive-text: #a0a0b0;
    --toggle-active-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    --meta-theme-color: #121215;

    /* Emulator UI & Keyboard Dark Tokens */
    --emu-bar-bg: #1e1e24;
    --emu-bar-border: #2d2d38;
    --emu-btn-bg: #2a2a34;
    --emu-btn-hover: #383846;
    --emu-btn-border: #3a3a48;
    --emu-text-primary: #f0f0f5;
    --emu-text-secondary: #a0a0b0;
    --emu-menu-bg: #1e1e24;
    --emu-menu-hover: #2d2d3a;
    --emu-icon-filter: brightness(0) invert(1);
    --emu-dialog-bg: #18181f;
    --emu-dialog-border: #2d2d38;
    --emu-dialog-shadow: rgba(0, 0, 0, 0.75);
    --emu-card-bg: #24242e;

    --vk-bg: #18181c;
    --vk-border: #33333d;
    --vk-key-bg: #2a2a32;
    --vk-key-text: #f2f2f7;
    --vk-key-border: #42424e;
    --vk-key-shadow: #121216;
    --vk-action-bg: #343440;
    --vk-action-text: #e2e8f0;
    --vk-shift-bg: #383846;
    --vk-shift-text: #fbbf24;
    --vk-sublabel-color: #f59e0b;
}

[data-theme="light"] {
    --bg-primary: #f4f4f7;
    --bg-surface: #ffffff;
    --text-primary: #18181b;
    --text-secondary: #52525b;
    --text-muted: #71717a;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.08);

    --toggle-bg: rgba(0, 0, 0, 0.05);
    --toggle-border: rgba(0, 0, 0, 0.08);
    --toggle-active-bg: #ffffff;
    --toggle-active-text: #18181b;
    --toggle-inactive-text: #71717a;
    --toggle-active-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    --meta-theme-color: #f4f4f7;

    /* Emulator UI & Keyboard Light Tokens */
    --emu-bar-bg: #e4e4e7;
    --emu-bar-border: #787888;
    --emu-btn-bg: #ffffff;
    --emu-btn-hover: #f4f4f7;
    --emu-btn-border: #d4d4d8;
    --emu-text-primary: #18181b;
    --emu-text-secondary: #52525b;
    --emu-menu-bg: #ffffff;
    --emu-menu-hover: #e4e4e7;
    --emu-icon-filter: brightness(0) opacity(0.85);
    --emu-dialog-bg: #ffffff;
    --emu-dialog-border: #787888;
    --emu-dialog-shadow: rgba(0, 0, 0, 0.12);
    --emu-card-bg: #f4f4f6;

    --vk-bg: #e4e4e7;
    --vk-border: #787888;
    --vk-key-bg: #ffffff;
    --vk-key-text: #18181b;
    --vk-key-border: #d4d4d8;
    --vk-key-shadow: #c4c4c8;
    --vk-action-bg: #f4f4f7;
    --vk-action-text: #27272a;
    --vk-shift-bg: #fef3c7;
    --vk-shift-text: #b45309;
    --vk-sublabel-color: #d97706;
}

html,
body {
    height: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    min-height: 100dvh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header {
    width: 640px;
    max-width: calc(100% - 32px);
    margin: 0 auto;
    padding: 24px 0 12px 0;
    position: relative;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-content {
    text-align: left;
    padding-right: 50px;
}

.header h1 {
    margin: 0;
    font-size: 30px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.header p {
    margin: 4px 0 0 0;
    font-size: 15px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
}

/* Theme Toggle Button (Upper Right Corner) */
.theme-toggle-btn {
    position: absolute;
    top: 20px;
    right: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    color: var(--text-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(8px);
    transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    box-shadow: var(--toggle-active-shadow);
    z-index: 10;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
    background-color: var(--toggle-active-bg);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

/* Icon visibility according to active theme setting */
.theme-toggle-btn .theme-icon {
    display: none;
    transition: transform 0.2s ease;
}

[data-theme-setting="system"] .theme-toggle-btn .icon-system,
:root:not([data-theme-setting]) .theme-toggle-btn .icon-system {
    display: block;
    color: var(--accent-color);
}

[data-theme-setting="dark"] .theme-toggle-btn .icon-moon {
    display: block;
    color: #60a5fa;
}

[data-theme-setting="light"] .theme-toggle-btn .icon-sun {
    display: block;
    color: #f59e0b;
}

@media (max-width: 600px) {
    .header {
        padding: 16px 0 12px 0;
    }

    .theme-toggle-btn {
        top: 14px;
        right: 0;
        width: 36px;
        height: 36px;
    }
}

#jsspeccy {
    width: fit-content;
    max-width: 100%;
    margin: 10px auto 16px auto;
    background-color: var(--bg-surface);
    box-sizing: border-box;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 30px var(--shadow-color);
    border: 1px solid var(--emu-bar-border, #2d2d38);
    transition: background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.footer {
    width: 640px;
    max-width: calc(100% - 32px);
    margin: 0 auto;
    box-sizing: border-box;
    text-align: center;
    padding: 8px 0 24px 0;
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
    transition: color 0.3s ease;
}

.footer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

body.fit-to-width {
    margin: 0 !important;
    padding: 0 !important;
    overflow: hidden;
    height: 100vh !important;
    height: 100dvh !important;
}

body.fit-to-width .header,
body.fit-to-width .footer {
    display: none !important;
}

body.fit-to-width #jsspeccy {
    width: 100% !important;
    height: 100% !important;
    max-width: 100% !important;
    max-height: 100dvh !important;
    margin: 0 !important;
    padding: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    border: none !important;
    overflow: hidden;
}