/* ============================================================
 * Button system.
 * A single base `.btn` provides the common appearance.
 * Size/weight variants (.btn-start, .btn-controls, .btn-small) override
 * dimensions and animation intensity only.
 * ============================================================ */

.btn {
    background: var(--color-navy-panel);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    color: #fff;
    cursor: pointer;
    transition: var(--transition-base);
    z-index: 2;
    animation: float 5s ease-in-out infinite, wave 8s ease-in-out infinite;
}

.btn:hover {
    background: var(--color-primary);
    color: var(--color-navy);
    transform: scale(1.07);
    box-shadow: var(--shadow-glow-sm);
}

/* ---------- Primary CTA ---------- */
.btn-start {
    width: 260px;
    font-size: 1.5rem;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-primary);
    color: var(--color-navy);
    box-shadow: var(--shadow-glow-sm);
    animation: float-strong 3.5s ease-in-out infinite, wave-strong 6s ease-in-out infinite;
    transform-origin: center;
}

.btn-start:hover {
    transform: scale(1.1);
    background: var(--color-navy-panel-muted);
    color: #fff;
}

/* ---------- Secondary ---------- */
.btn-controls {
    width: 180px;
    font-size: 1.2rem;
    padding: 0.7rem var(--space-md);
    background: var(--color-navy-panel-muted);
    animation: float 6s ease-in-out infinite, wave 9s ease-in-out infinite;
}

/* ---------- Small / tertiary ---------- */
.btn-small {
    width: 120px;
    font-size: 0.9rem;
    padding: 0.6rem;
    background: var(--color-navy-panel-muted);
    border-width: 1px;
    color: var(--color-text);
    animation: float-light 7s ease-in-out infinite, wave-light 10s ease-in-out infinite;
}

.btn-small:hover {
    transform: scale(1.05);
}

/* ---------- Chromeless pause/mute buttons ---------- */
#pause-btn,
#mute-btn {
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    background: none;
    border: none;
}

#pause-btn:hover,
#mute-btn:hover {
    background: none;
    box-shadow: none;
}

/* ---------- Float + wave animations ---------- */

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25%      { transform: rotate(-1.2deg); }
    75%      { transform: rotate(1.2deg); }
}

@keyframes float-strong {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-10px); }
}

@keyframes wave-strong {
    0%, 100% { transform: rotate(0deg); }
    25%      { transform: rotate(-2deg); }
    75%      { transform: rotate(2deg); }
}

@keyframes float-light {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-3px); }
}

@keyframes wave-light {
    0%, 100% { transform: rotate(0deg); }
    25%      { transform: rotate(-0.8deg); }
    75%      { transform: rotate(0.8deg); }
}

/* ---------- Responsive sizing ---------- */

@media (max-height: 600px) and (orientation: landscape) {
    .btn-start {
        width: clamp(180px, 30vw, 220px);
        font-size: clamp(1rem, 2.5vw, 1.3rem);
        padding: 0.7rem var(--space-md);
    }

    .btn-controls {
        width: clamp(140px, 25vw, 160px);
        font-size: clamp(0.9rem, 2vw, 1.1rem);
        padding: var(--space-sm) 0.8rem;
    }

    .btn-small {
        width: clamp(90px, 18vw, 110px);
        font-size: clamp(0.75rem, 1.8vw, 0.85rem);
        padding: var(--space-xs) var(--space-sm);
    }
}