/**
 * Partner Logo Display - Enhanced Frontend Styles
 * 
 * Modern, professional, brand-neutral stylesheet
 * Fully customizable via plugin settings panel
 * 
 * Design Principles:
 * - Clean, minimal aesthetic
 * - Professional appearance
 * - Highly customizable
 * - Performance optimized
 * - Accessible by default
 * 
 * @package Partner_Logo_Display
 * @since 2.0.0
 */

/* ========================================
   CSS Custom Properties (Variables)
   All values can be overridden via plugin settings
   ======================================== */

:root {
    /* Brand Colors - Neutral defaults, customizable via settings */
    --partner-logo-display-primary: #2563EB;      /* Professional Blue */
    --partner-logo-display-accent: #10B981;       /* Modern Green */
    --partner-logo-display-highlight: #F59E0B;    /* Warm Amber */
    --partner-logo-display-background: #F9FAFB;   /* Light Gray */
    --partner-logo-display-border: #E5E7EB;       /* Border Gray */
    
    /* Logo Container Styling - Customizable via settings */
    --partner-logo-display-logo-padding: 16px;
    --partner-logo-display-logo-bg: #FFFFFF;
    --partner-logo-display-logo-border-width: 1px;
    --partner-logo-display-logo-border-color: #E5E7EB;
    --partner-logo-display-logo-border-style: solid;
    --partner-logo-display-logo-border-radius: 8px;
    --partner-logo-display-logo-shadow: 0 2px 8px 0 rgba(0, 0, 0, 0.1);
    
    /* Typography - Customizable via settings */
    --partner-logo-display-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --partner-logo-display-title-font-size: 14px;
    --partner-logo-display-title-font-weight: 400;
    --partner-logo-display-title-color: #374151;
    
    /* Spacing - Customizable via settings */
    --partner-logo-display-border-radius: 8px;
    --partner-logo-display-row-gap: 12px;
    --partner-logo-display-column-gap: 12px;
    
    /* Transitions - Smooth, professional */
    --partner-logo-display-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --partner-logo-display-transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Animation - Customizable via settings */
    --partner-logo-display-animation-duration: 600ms;
    --partner-logo-display-animation-delay: 0ms;
    --partner-logo-display-animation-stagger: 100ms;
    --partner-logo-display-animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout - Customizable via settings */
    --partner-logo-display-justify: center;
    --partner-logo-display-align: center;
    --partner-logo-display-min-width: 80px;
    --partner-logo-display-max-width: 300px;
    
    /* Image Display - Customizable via settings */
    --partner-logo-display-aspect-ratio: auto;
    --partner-logo-display-object-fit: contain;
    --partner-logo-display-max-h: 56;
}

/* ========================================
   Base Styles - Modern & Accessible
   ======================================== */

.partner-logo-display {
    position: relative;
    margin: 2.5rem 0;
    font-family: var(--partner-logo-display-font-family);
    isolation: isolate; /* Create stacking context */
}

.partner-logo-display * {
    box-sizing: border-box;
}

/* Alignment */
.partner-logo-display.align-left {
    text-align: left;
}

.partner-logo-display.align-center {
    text-align: center;
}

.partner-logo-display.align-right {
    text-align: right;
}

/* ========================================
   Logo Items - Enhanced Visual Design
   ======================================== */

.partner-logo-display__item {
    display: inline-block;
    transition: opacity var(--partner-logo-display-transition),
                transform var(--partner-logo-display-transition);
    will-change: opacity, transform;
}

.partner-logo-display__link,
.partner-logo-display__static {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--partner-logo-display-logo-padding);
    background: var(--partner-logo-display-logo-bg);
    border: var(--partner-logo-display-logo-border-width) var(--partner-logo-display-logo-border-style) var(--partner-logo-display-logo-border-color);
    border-radius: var(--partner-logo-display-logo-border-radius);
    box-shadow: var(--partner-logo-display-logo-shadow);
    transition: all var(--partner-logo-display-transition);
    height: 100%;
    min-height: 80px;
}

/* Subtle gradient overlay for depth */
.partner-logo-display__link::before,
.partner-logo-display__static::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity var(--partner-logo-display-transition-fast);
    pointer-events: none;
    z-index: 1;
}

.partner-logo-display__link {
    cursor: pointer;
    text-decoration: none;
}

/* Enhanced focus state for accessibility */
.partner-logo-display__link:focus {
    outline: 3px solid var(--partner-logo-display-accent);
    outline-offset: 4px;
    box-shadow: var(--partner-logo-display-logo-shadow), 
                0 0 0 4px rgba(16, 185, 129, 0.15);
}

.partner-logo-display__link:focus:not(:focus-visible) {
    outline: none;
    box-shadow: var(--partner-logo-display-logo-shadow);
}

/* Subtle shine effect on hover */
.partner-logo-display__link:hover::before {
    opacity: 1;
}

.partner-logo-display__link:hover {
    border-color: var(--partner-logo-display-accent);
    box-shadow: 0 4px 20px 0 rgba(0, 0, 0, 0.12);
}

/* Image styling - Professional & Optimized */
.partner-logo-display__img {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    object-fit: var(--partner-logo-display-object-fit, contain);
    aspect-ratio: var(--partner-logo-display-aspect-ratio, auto);
    transition: all var(--partner-logo-display-transition);
    position: relative;
    z-index: 2;
}

/* Logo Titles - Elegant Typography */
.partner-logo-display__title {
    margin-top: 14px;
    padding: 0 8px;
    font-family: var(--partner-logo-display-font-family);
    font-size: var(--partner-logo-display-title-font-size);
    font-weight: var(--partner-logo-display-title-font-weight);
    line-height: 1.5;
    text-align: center;
    color: var(--partner-logo-display-title-color, #374151);
    letter-spacing: -0.01em;
    transition: color var(--partner-logo-display-transition-fast);
}

.partner-logo-display__link:hover .partner-logo-display__title {
    color: var(--partner-logo-display-primary);
}

/* Screen reader text */
.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========================================
   Grayscale Effect - Elegant & Smooth
   ======================================== */

.partner-logo-display.is-grayscale .partner-logo-display__img {
    filter: grayscale(100%) contrast(0.95);
    opacity: 0.72;
}

.partner-logo-display.is-grayscale .partner-logo-display__link:hover .partner-logo-display__img,
.partner-logo-display.is-grayscale .partner-logo-display__link:focus .partner-logo-display__img {
    filter: grayscale(0%) contrast(1);
    opacity: 1;
}

/* Smooth transition for color logos */
.partner-logo-display.is-color .partner-logo-display__img {
    filter: none;
    opacity: 1;
}

/* ========================================
   Hover Effects - Modern & Professional
   ======================================== */

/* Scale effect - Subtle zoom */
.partner-logo-display[data-hover="scale"] .partner-logo-display__link:hover .partner-logo-display__img,
.partner-logo-display[data-hover="scale"] .partner-logo-display__link:focus .partner-logo-display__img {
    transform: scale(1.08);
}

/* Lift effect - Elegant elevation */
.partner-logo-display[data-hover="lift"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover="lift"] .partner-logo-display__link:focus {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

/* Border effect - Accent glow */
.partner-logo-display[data-hover="border"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover="border"] .partner-logo-display__link:focus {
    border: 2px solid var(--partner-logo-display-accent);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.25),
                0 4px 16px rgba(0, 0, 0, 0.1);
}

/* Brighten effect - Warm glow */
.partner-logo-display[data-hover="brighten"] .partner-logo-display__link:hover .partner-logo-display__img,
.partner-logo-display[data-hover="brighten"] .partner-logo-display__link:focus .partner-logo-display__img {
    filter: brightness(1.12) contrast(1.05);
}

/* Rotate effect - Playful tilt */
.partner-logo-display[data-hover="rotate"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover="rotate"] .partner-logo-display__link:focus {
    transform: rotate(3deg) scale(1.02);
}

/* Glow effect - Accent radiance */
.partner-logo-display[data-hover="glow"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover="glow"] .partner-logo-display__link:focus {
    box-shadow: 0 0 24px rgba(16, 185, 129, 0.5),
                0 8px 32px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

/* 3D Tilt effect - Perspective depth */
.partner-logo-display[data-hover="tilt"] .partner-logo-display__link {
    transform-style: preserve-3d;
    perspective: 1000px;
}

.partner-logo-display[data-hover="tilt"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover="tilt"] .partner-logo-display__link:focus {
    transform: perspective(1000px) rotateY(8deg) rotateX(-2deg);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

/* Zoom out effect - Reverse zoom */
.partner-logo-display[data-hover="zoom-out"] .partner-logo-display__link:hover .partner-logo-display__img,
.partner-logo-display[data-hover="zoom-out"] .partner-logo-display__link:focus .partner-logo-display__img {
    transform: scale(0.92);
    opacity: 0.9;
}

/* ========================================
   Secondary Hover Effects - Layered Polish
   ======================================== */

/* Outline pulse effect - Rhythmic attention */
.partner-logo-display[data-hover-secondary="outline"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover-secondary="outline"] .partner-logo-display__link:focus {
    outline: 2px solid var(--partner-logo-display-accent);
    outline-offset: 5px;
    animation: outlinePulse 2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes outlinePulse {
    0%, 100% { 
        outline-width: 2px; 
        outline-offset: 5px; 
        outline-color: var(--partner-logo-display-accent);
    }
    50% { 
        outline-width: 3px; 
        outline-offset: 7px; 
        opacity: 0.6;
    }
}

/* Shadow grow effect - Dramatic depth */
.partner-logo-display[data-hover-secondary="shadow-grow"] .partner-logo-display__link:hover,
.partner-logo-display[data-hover-secondary="shadow-grow"] .partner-logo-display__link:focus {
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.25),
                0 8px 16px rgba(0, 0, 0, 0.12);
}

/* Blur background effect - Soft radiance */
.partner-logo-display[data-hover-secondary="blur-bg"] .partner-logo-display__link:hover::after,
.partner-logo-display[data-hover-secondary="blur-bg"] .partner-logo-display__link:focus::after {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    right: -15px;
    bottom: -15px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, rgba(245, 158, 11, 0.05) 50%, transparent 70%);
    z-index: -1;
    animation: bgBlur 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ========================================
   Loading & Empty States - Clear & Friendly
   ======================================== */

.partner-logo-display-loading {
    text-align: center;
    padding: 4rem 2rem;
    color: #6b7280;
    font-family: var(--partner-logo-display-font-family);
    font-size: 15px;
}

.partner-logo-display-loading::before {
    content: '';
    display: inline-block;
    width: 32px;
    height: 32px;
    margin-bottom: 16px;
    border: 3px solid var(--partner-logo-display-border);
    border-top-color: var(--partner-logo-display-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.partner-logo-display-empty {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--partner-logo-display-background);
    border: 2px dashed var(--partner-logo-display-border);
    border-radius: var(--partner-logo-display-border-radius);
    color: #6b7280;
    font-family: var(--partner-logo-display-font-family);
    transition: all var(--partner-logo-display-transition);
}

.partner-logo-display-empty:hover {
    border-color: var(--partner-logo-display-accent);
    background: rgba(16, 185, 129, 0.02);
}

.partner-logo-display-empty p {
    margin: 0.5rem 0;
    font-size: 15px;
    line-height: 1.6;
}

.partner-logo-display-empty a {
    color: var(--partner-logo-display-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--partner-logo-display-transition-fast);
}

.partner-logo-display-empty a:hover {
    color: var(--partner-logo-display-primary);
    text-decoration: underline;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .partner-logo-display {
        margin: 1.5rem 0;
    }
}

/* ========================================
   Entrance Animations
   ======================================== */

/* Initial hidden state for animations */
.partner-logo-display[data-animation]:not([data-animation="none"]) .partner-logo-display__item {
    opacity: 0;
}

.partner-logo-display[data-animation]:not([data-animation="none"]) .partner-logo-display__item.is-animated {
    opacity: 1;
}

/* Fade In */
.partner-logo-display[data-animation="fade"] .partner-logo-display__item {
    opacity: 0;
}

.partner-logo-display[data-animation="fade"] .partner-logo-display__item.is-animated {
    opacity: 1;
    animation: fadeIn var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Slide Up */
.partner-logo-display[data-animation="slide-up"] .partner-logo-display__item {
    opacity: 0;
    transform: translateY(30px);
}

.partner-logo-display[data-animation="slide-up"] .partner-logo-display__item.is-animated {
    animation: slideUp var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Slide Down */
.partner-logo-display[data-animation="slide-down"] .partner-logo-display__item {
    opacity: 0;
    transform: translateY(-30px);
}

.partner-logo-display[data-animation="slide-down"] .partner-logo-display__item.is-animated {
    animation: slideDown var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Slide Left */
.partner-logo-display[data-animation="slide-left"] .partner-logo-display__item {
    opacity: 0;
    transform: translateX(30px);
}

.partner-logo-display[data-animation="slide-left"] .partner-logo-display__item.is-animated {
    animation: slideLeft var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes slideLeft {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Slide Right */
.partner-logo-display[data-animation="slide-right"] .partner-logo-display__item {
    opacity: 0;
    transform: translateX(-30px);
}

.partner-logo-display[data-animation="slide-right"] .partner-logo-display__item.is-animated {
    animation: slideRight var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes slideRight {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Zoom In */
.partner-logo-display[data-animation="zoom-in"] .partner-logo-display__item {
    opacity: 0;
    transform: scale(0.8);
}

.partner-logo-display[data-animation="zoom-in"] .partner-logo-display__item.is-animated {
    animation: zoomIn var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* Zoom Out */
.partner-logo-display[data-animation="zoom-out"] .partner-logo-display__item {
    opacity: 0;
    transform: scale(1.2);
}

.partner-logo-display[data-animation="zoom-out"] .partner-logo-display__item.is-animated {
    animation: zoomOut var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes zoomOut {
    from { opacity: 0; transform: scale(1.2); }
    to { opacity: 1; transform: scale(1); }
}

/* Flip */
.partner-logo-display[data-animation="flip"] .partner-logo-display__item {
    opacity: 0;
    transform: rotateY(90deg);
}

.partner-logo-display[data-animation="flip"] .partner-logo-display__item.is-animated {
    animation: flip var(--partner-logo-display-animation-duration) ease forwards;
}

@keyframes flip {
    from { opacity: 0; transform: rotateY(90deg); }
    to { opacity: 1; transform: rotateY(0); }
}

/* Bounce */
.partner-logo-display[data-animation="bounce"] .partner-logo-display__item {
    opacity: 0;
    transform: translateY(-20px);
}

.partner-logo-display[data-animation="bounce"] .partner-logo-display__item.is-animated {
    animation: bounce var(--partner-logo-display-animation-duration) cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

@keyframes bounce {
    0% { opacity: 0; transform: translateY(-20px); }
    50% { transform: translateY(5px); }
    70% { transform: translateY(-3px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* ========================================
   Accessibility
   ======================================== */

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
    .partner-logo-display *,
    .partner-logo-display *::before,
    .partner-logo-display *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .partner-logo-display__link:focus {
        outline-width: 4px;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .partner-logo-display {
        page-break-inside: avoid;
    }
    
    .partner-logo-display__link {
        border: 1px solid #000;
    }
    
    .partner-logo-display.is-grayscale .partner-logo-display__img {
        filter: none;
        opacity: 1;
    }
}