body.eco-app .btn,
body.eco-guest .btn {
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0.85rem 1.25rem;
    border: 1px solid transparent;
    border-radius: 18px;
    font-weight: 900;
    letter-spacing: 0.01em;
    transition: transform var(--eco-transition-fast), box-shadow var(--eco-transition-fast), background var(--eco-transition-fast), border-color var(--eco-transition-fast), color var(--eco-transition-fast);
    box-shadow: 0 12px 24px rgba(46, 125, 50, 0.12);
}

body.eco-app .btn::after,
body.eco-guest .btn::after {
    content: "";
    position: absolute;
    inset: auto auto -120% -30%;
    width: 140%;
    height: 140%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.16);
    transition: transform 0.4s ease;
    transform: scale(0);
}

body.eco-app .btn:hover::after,
body.eco-app .btn:focus-visible::after,
body.eco-guest .btn:hover::after,
body.eco-guest .btn:focus-visible::after {
    transform: scale(1);
}

body.eco-app .btn:hover,
body.eco-app .btn:focus-visible,
body.eco-guest .btn:hover,
body.eco-guest .btn:focus-visible {
    transform: translateY(-2px);
}

body.eco-app .btn:active,
body.eco-guest .btn:active {
    transform: translateY(0);
}

body.eco-app .btn:focus-visible,
body.eco-guest .btn:focus-visible {
    outline: 3px solid rgba(66, 165, 245, 0.28);
    outline-offset: 2px;
}

body.eco-app .btn-primary,
body.eco-guest .btn-primary {
    background: linear-gradient(135deg, var(--eco-primary), var(--eco-primary-soft));
    color: #fff;
}

body.eco-app .btn-secondary,
body.eco-guest .btn-secondary {
    background: linear-gradient(135deg, rgba(66, 165, 245, 0.95), rgba(41, 182, 246, 0.95));
    color: #fff;
}

body.eco-app .btn-success,
body.eco-guest .btn-success {
    background: linear-gradient(135deg, var(--eco-success), #66bb6a);
    color: #fff;
}

body.eco-app .btn-danger,
body.eco-guest .btn-danger {
    background: linear-gradient(135deg, var(--eco-danger), #ef5350);
    color: #fff;
}

body.eco-app .btn-warning,
body.eco-guest .btn-warning {
    background: linear-gradient(135deg, var(--eco-warning), var(--eco-accent));
    color: #533400;
}

body.eco-app .btn-outline,
body.eco-guest .btn-outline {
    background: rgba(255, 255, 255, 0.88);
    border-color: var(--eco-border);
    color: var(--eco-text);
}

body.eco-app .btn[disabled],
body.eco-app .btn.disabled,
body.eco-guest .btn[disabled],
body.eco-guest .btn.disabled {
    cursor: not-allowed;
    opacity: 0.58;
    box-shadow: none;
    transform: none;
}

body.eco-app .icon-only-btn,
body.eco-guest .icon-only-btn {
    width: 44px;
    min-width: 44px;
    min-height: 44px;
    padding: 0;
}

body.eco-app .app-icon,
body.eco-guest .app-icon {
    display: block;
    width: 18px;
    height: 18px;
    object-fit: contain;
    flex-shrink: 0;
}

body.eco-app .btn .app-icon-light,
body.eco-guest .btn .app-icon-light {
    filter: brightness(0) invert(1);
}

body.eco-app .sr-only,
body.eco-guest .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}