.btn-primary-dark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 24px;
    border: 1.5px solid var(--color-primary);
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-display);
    font-weight: var(--font-weight-bold);
    font-size: 18px;
    letter-spacing: -0.02em;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 3px 3px 0 rgba(26, 26, 26, 0.3);
}

.btn-primary-dark:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.btn-primary-dark:active {
    transform: scale(0.96);
    box-shadow: 1px 1px 0 rgba(26, 26, 26, 0.3);
}

.btn-step-continue {
    align-self: flex-start;
    margin-top: 8px;
    background: var(--color-yellow-sticky);
    color: var(--color-text);
    border: 2px solid var(--color-text);
    border-radius: 5px;
    padding: 6px 18px;
    font-family: var(--font-family);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.btn-step-continue:hover {
    background: var(--color-yellow-hover);
}

.btn-step-continue:active {
    background: #F0B840;
}

.btn-step-continue.is-hidden {
    display: none;
}

.btn-step-continue.is-revealing {
    animation: btn-continue-enter 180ms ease-out;
}

@keyframes btn-continue-enter {
    from { transform: scale(0.85); opacity: 0; }
    to   { transform: scale(1.00); opacity: 1; }
}

.btn-step-continue.unpause {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-text);
}

.btn-step-continue.unpause:hover {
    background: var(--color-primary-hover);
}

.btn-step-continue.unpause:active {
    background: var(--color-primary-hover);
}

.btn-completion-primary,
.btn-completion-secondary {
    height: 30px;
    padding: 0 20px;
    border-radius: var(--completion-btn-radius);
    font-family: var(--font-family);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 3px 3px 0 rgba(26, 26, 26, 0.20);
    min-width: 160px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-completion-primary {
    background: var(--color-success);
    color: var(--color-white);
    border: 1px solid var(--color-success-border);
}

.btn-completion-primary:hover {
    background: var(--color-success-hover);
}

.btn-completion-secondary {
    background: var(--completion-btn-secondary-bg);
    color: var(--completion-btn-secondary-color);
    border: 1px solid var(--completion-btn-secondary-border);
}

.btn-completion-secondary:hover {
    background: var(--color-surface-hover);
}

.zoom-in-btn {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translate(-50%, 0) scale(0.7);
    opacity: 0;
    z-index: 70;

    background: var(--color-yellow-sticky);
    color: var(--color-text);
    border: 1.5px solid var(--color-primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-button);
    padding: 10px 22px;
    font-family: var(--font-family);
    font-weight: 800;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: transform var(--transition-fast), opacity var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.zoom-in-btn[hidden] {
    display: none;
}

.zoom-in-btn.visible {
    transform: translate(-50%, 0) scale(1);
    opacity: 1;
}

.zoom-in-btn:hover {
    background: var(--color-yellow-hover);
    box-shadow: var(--shadow-button-hover);
}

.zoom-in-btn:active {
    transform: translate(-50%, 0) scale(0.96);
    box-shadow: 1px 1px 0 rgba(26, 26, 26, 0.3);
}

.zoom-in-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 3px 3px 0 rgba(26, 26, 26, 0.3);
}

.zoom-in-btn.active:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}