.controls-container {
    grid-column: 2;
    width: 100%;
    max-width: 220px;
    margin-left: 0;
}

.buttons {
    margin: 2rem 0;
}

button {
    padding: 0.625em 1.25em;
    margin: 0.3125em 0;
    font-size: 1rem;
    background: var(--bg-button);
    color: var(--text-color-main);
    border: var(--border-soft);
    border-radius: 0.3125em;
    cursor: pointer;
    transition: background 0.3s, border-color 0.2s, box-shadow 0.2s;
    box-shadow: var(--box-shadow-soft);
}

button:hover {
    background: var(--bg-hover);
    border-color: #4CAF50;
    color: #fff;
}

.mode button.active,
.color button.active {
    background: var(--bg-active);
    color: white;
    border-color: #388e3c;
    cursor: default;
    opacity: 1;
}

.mode button.inactive,
.color button.inactive {
    background: var(--bg-inactive);
    color: #222;
    border-color: #bbb;
    cursor: pointer;
    opacity: 0.7;
}

.mode button.locked {
    position: relative;
    opacity: 0.5;
    cursor: not-allowed;
}

.mode button.locked::after {
    content: '🔒';
    position: absolute;
    top: 0.25em;
    right: 0.375em;
    font-size: 1em;
}

.start-button {
    align-self: flex-start;
    margin-bottom: 0.625em;
    cursor: pointer;
    padding: 0.75em 1.5em;
    background: var(--grad-start);
    color: white;
    font-size: 1.2rem;
    border: var(--border-strong);
    border-radius: 0.75em;
    transition: all 0.3s ease;
    box-shadow: var(--box-shadow-strong);
    font-weight: 600;
}

.start-button:hover {
    transform: scale(1.05);
    box-shadow: 0 0.375em 1em rgba(0, 0, 0, 0.25);
    filter: brightness(1.05);
    background: var(--grad-hover);
}

#browseButtonContainer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 1rem 0;
}

#browseButtonContainer>button {
    margin: 0 0.2rem;
}

.back-button,
.browseback,
.browseforward,
.browseallthewayback,
.browseallthewayforward {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    height: 2em;
    width: 2em;
    background: var(--bg-button);
    padding: 0.5em 0.75em;
    font-size: 1.5em;
    border-radius: 0.5em;
    color: #fff;
    user-select: none;
    box-shadow: var(--box-shadow-soft);
    border: 1.5px solid #2ea4ff52;
    transition: background 0.2s, box-shadow 0.2s, transform 0.15s, border-color 0.2s;
}

.back-button {
    background: var(--grad-danger);
    border: var(--border-danger);
}

.back-button:hover {
    background: var(--grad-danger-hover);
    box-shadow: 0 0.25em 1em rgba(255, 87, 34, 0.25);
    transform: translateY(-0.125em) scale(1.07);
    border-color: #ff1744;
}

.browseback:hover,
.browseforward:hover,
.browseallthewayback:hover,
.browseallthewayforward:hover {
    background: var(--grad-arrow-hover);
    box-shadow: 0 0.25em 1em rgba(162, 171, 88, 0.18);
    border-color: #a2ab58;
}

.back-button::before {
    content: '←';
}

.browseback::before {
    content: '<';
}

.browseforward::before {
    content: '>';
}

.browseallthewayback::before {
    content: '<<';
}

.browseallthewayforward::before {
    content: '>>';
}

.login-button {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: -3.75em;
    color: #fff !important;
    background: var(--bg-button) !important;
    background-color: var(--bg-board) !important;
    border: 1.5px solid #2ea4ff52;
}

.login-button * {
    color: #fff !important;
    fill: #fff !important;
}

.login-button:hover {
    background: var(--bg-button) !important;
    border-color: #2ea4ff;
    filter: brightness(1.05);
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .controls-container {
        max-width: 100%;
    }

    .start-button,
    button {
        font-size: 1em;
        padding: 0.75em 1em;
    }

    .back-button,
    .browseback,
    .browseforward,
    .browseallthewayback,
    .browseallthewayforward {
        width: 2.5em;
        height: 2.5em;
        font-size: 1.2em;
        padding: 0.5em;
    }

    .login-button {
        margin-top: -2em;
        font-size: 1em;
    }
}

.lichess-analysis {
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    background: #232323;
    color: #fff;
    border: 0.125em solid #b7b7b7;
    border-radius: 0.5em;
    font-size: 1em;
    font-weight: 500;
    box-shadow: 0 0.125em 0.5em rgba(0, 0, 0, 0.12);
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
    position: absolute;
    top: 0;
    left: 50%;
    padding: 0.5em 0.7em;
    min-width: 2.5em;
    min-height: 2.5em;
    margin-top: 10rem;
    margin-left: 14rem;
}

.lichess-analysis::before {
    content: '';
    display: inline-block;
    width: 2em;
    height: 2em;
    background-image: url('https://upload.wikimedia.org/wikipedia/commons/d/da/Lichess_Logo_2019.svg');
    background-size: contain;
    background-repeat: no-repeat;
    vertical-align: middle;
}

.lichess-analysis:hover {
    background: #111;
    border-color: #f5c700;
    box-shadow: 0 0.25em 1em rgba(0, 0, 0, 0.18);
}