/**
 * CSS Utilities - Standalone UI-Elemente
 * 
 * - Toast Notifications
 * - Scroll to Top Button
 * - Animations
 * - Responsive Helpers
 */

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */
#toast {
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    opacity: 0;
    transition: all var(--transition-normal) var(--ease-out);
    z-index: var(--z-toast);
    box-shadow: var(--shadow-lg);
    pointer-events: none;
}

#toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    pointer-events: auto;
}

/* Toast Variants (for future use) */
#toast[data-type="success"] {
    background: var(--success);
}

#toast[data-type="warning"] {
    background: var(--warning);
    color: var(--text-primary);
}

#toast[data-type="error"] {
    background: var(--danger);
}

/* ========================================
   SCROLL TO TOP BUTTON
   ======================================== */
#scrollTop {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal) var(--ease-out);
    z-index: var(--z-fixed);
}

#scrollTop.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#scrollTop:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

#scrollTop:active {
    transform: translateY(-2px);
}

#scrollTop svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-inverse);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Animation Classes */
.animate-fade-in {
    animation: fadeIn var(--transition-normal) var(--ease-out);
}

.animate-fade-in-up {
    animation: fadeInUp var(--transition-normal) var(--ease-out);
}

.animate-scale-in {
    animation: scaleIn var(--transition-normal) var(--ease-out);
}

.animate-pulse {
    animation: pulse 2s var(--ease-in-out) infinite;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

/* ========================================
   LOADING STATES
   ======================================== */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="dark"] .loading::after {
    background: rgba(15, 23, 42, 0.7);
}

/* ========================================
   RESPONSIVE HELPERS
   ======================================== */
@media (max-width: 640px) {
    .hide-mobile {
        display: none !important;
    }
}

@media (min-width: 641px) and (max-width: 1023px) {
    .hide-tablet {
        display: none !important;
    }
}

@media (min-width: 1024px) {
    .hide-desktop {
        display: none !important;
    }
}

@media (max-width: 1023px) {
    .show-desktop-only {
        display: none !important;
    }
}

@media (min-width: 641px) {
    .show-mobile-only {
        display: none !important;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .header,
    .hero-cta,
    .trust-indicators,
    .card-actions,
    .keyword-section,
    .limits-section,
    .cta-section,
    .footer,
    #scrollTop,
    #toast,
    .theme-toggle,
    .mobile-menu-btn {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }

    .hero {
        padding-top: var(--space-xl);
        background: none;
    }

    a {
        text-decoration: underline;
    }

    a::after {
        content: ' (' attr(href) ')';
        font-size: 0.8em;
        color: #666;
    }
}