:root {
    --color-primary: #374e93;
    --color-secondary: #0d9ea2;
    --color-accent: #c7d64f;
    --color-dark: #23293a;
    --color-text: #323f3e;
    --color-border: #e8f4f5;
    --color-bg-light: #f4fafd;
    --border-radius: 1.4rem;
    --border-radius-sm: 0.95rem;
    --shadow-light: 0 2px 12px rgba(55,78,147,0.07);
    --shadow-medium: 0 8px 32px 0 rgba(55, 78, 147, 0.13);
    --shadow-strong: 0 18px 40px 0 rgba(13, 158, 162, 0.15), 0 8px 16px 0 rgba(55, 78, 147, 0.08), 0 2px 8px 0 rgba(35, 41, 58, 0.05);
    
    /* Nowe zmienne do animacji */
    --animation-fast: 0.2s;
    --animation-normal: 0.3s;
    --animation-slow: 0.5s;
    --easing-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.partners-grid {
    width: 100%;
    padding: 3rem 0 2.5rem 0;
    margin: 0 auto;
    background: #fff;
    font-family: 'Roboto', 'Tahoma', Arial, sans-serif;
    /* Animacja wejścia całej sekcji */
    opacity: 0;
    transform: translateY(30px);
    animation: sectionFadeIn 0.8s var(--easing-smooth) 0.2s forwards;
}

/* Animacja wejścia sekcji */
@keyframes sectionFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Unikamy powtarzania font-family */
.partners-grid * {
    font-family: inherit;
}

.partners-title {
    color: var(--color-dark);
    text-align: center;
    margin-bottom: 2.2rem;
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -0.01em;
    line-height: 1.15;
    position: relative;
    /* Animacja tytułu z lekkim bounce */
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
    animation: titleSlideIn 0.6s var(--easing-bounce) 0.4s forwards;
}

/* Animacja wejścia tytułu */
@keyframes titleSlideIn {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.partners-title::after {
    content: '';
    position: absolute;
    bottom: -0.7rem;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 4rem;
    height: 0.22rem;
    background: linear-gradient(90deg, var(--color-secondary) 0%, var(--color-accent) 100%);
    background-size: 200% 100%;
    animation: 
        underlineGrow 0.8s var(--easing-smooth) 0.8s forwards,
        gradient-shift 3s ease-in-out 1.6s infinite alternate;
    border-radius: 0.25rem;
    opacity: 0.7;
    transform-origin: center;
}

/* Animacja rozrastania się podkreślenia */
@keyframes underlineGrow {
    to {
        transform: translateX(-50%) scaleX(1);
    }
}

@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

/* RÓWNE KOLUMNY – ZAWSZE 3 NA DESKTOPIE */
.partners-container {
    /* Grid z fallback dla starszych przeglądarek */
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.3rem;
    max-width: 1080px;
    padding: 0 1rem;
    margin: 0 auto;
    align-items: stretch;
    /* Animacja kontenera - delikatne fade-in */
    opacity: 0;
    animation: containerFadeIn 0.6s var(--easing-smooth) 1.0s forwards;
}

/* Animacja wejścia kontenera */
@keyframes containerFadeIn {
    to {
        opacity: 1;
    }
}

/* Fallback dla przeglądarek bez CSS Grid */
@supports not (display: grid) {
    .partners-container {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .partner-card {
        flex: 0 1 calc(33.333% - 1rem);
        margin: 0.65rem;
    }
}

/* BARDZO DUŻE EKRANY */
@media (min-width: 1400px) {
    .partners-container {
        max-width: 1200px;
        gap: 2rem;
    }
}

/* 
   PRZYSZŁA OPTYMALIZACJA - Container Queries (zamiast Media Queries):
   Gdy będzie lepsze wsparcie przeglądarek, można zastąpić @media przez @container
   dla bardziej precyzyjnej responsywności bazującej na rozmiarze kontenera, nie okna
*/

/* TABLET: 2 kolumny */
@media (max-width: 900px) {
    .partners-container {
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
        padding: 0 1.5rem;
    }
    
    .partner-content {
        padding: 1.3rem 1rem 1.2rem 1rem;
    }
}

/* MOBILE: 1 kolumna */
@media (max-width: 600px) {
    .partners-container {
        grid-template-columns: 1fr;
    }
}

/* BARDZO MAŁE URZĄDZENIA */
@media (max-width: 400px) {
    .partners-grid {
        padding: 2rem 0 1.5rem 0;
    }
    
    .partners-container {
        padding: 0 0.5rem;
        gap: 1rem;
    }
    
    .partner-content {
        padding: 1rem 0.8rem 1rem 0.8rem;
    }
    
    .partners-title {
        font-size: clamp(1.2rem, 5vw, 1.8rem);
    }
    
    .partner-name {
        font-size: 1.05rem;
    }
    
    .partner-description {
        font-size: 0.95rem;
    }
}

.partner-card {
    background: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    border: 1.7px solid var(--color-border);
    min-height: 340px;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    transform: translateY(40px) scale(0.95);
    animation: cardSlideIn 0.7s var(--easing-smooth) forwards;
    animation-delay: var(--delay, 0s);
    transition: 
        box-shadow var(--animation-normal), 
        border-color var(--animation-normal), 
        transform var(--animation-fast);
    /* Hover state preparation */
    position: relative;
    cursor: pointer;
}

/* Ulepsziona animacja wejścia karty */
@keyframes cardSlideIn {
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1); 
    }
}

.partner-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(55, 78, 147, 0.02) 0%, 
        rgba(13, 158, 162, 0.02) 50%, 
        rgba(199, 214, 79, 0.02) 100%);
    opacity: 0;
    transition: opacity var(--animation-normal);
    pointer-events: none;
}

.partner-card:hover::before {
    opacity: 1;
}

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

.partner-card:hover,
.partner-card:focus-within {
    box-shadow: var(--shadow-strong);
    border-color: var(--color-primary);
    transform: translateY(-8px) scale(1.02);
}

/* Animacja pulsowania przy focus */
.partner-card:focus-within {
    animation: focusPulse 2s ease-in-out infinite;
}

@keyframes focusPulse {
    0%, 100% { 
        box-shadow: var(--shadow-strong);
    }
    50% { 
        box-shadow: var(--shadow-strong), 0 0 0 4px rgba(55, 78, 147, 0.1);
    }
}

.partner-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    flex: 1 1 auto;
    width: 100%;
    padding: 1.5rem 1rem 1.3rem 1rem;
    gap: 1.1rem;
    text-align: center;
    min-height: 260px;
}

.partner-logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-light);
    border-radius: 1rem;
    padding: 0.7rem 1rem;
    min-height: 90px;
    min-width: 160px;
    max-width: 180px;
    margin: 0 auto 1.1rem auto;
    border: 1.5px solid var(--color-border);
    transition: 
        border-color var(--animation-normal), 
        box-shadow var(--animation-normal),
        background-color var(--animation-normal);
    position: relative;
    overflow: hidden;
}

/* Efekt świetlny na hover */
.partner-logo-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.4), 
        transparent);
    transition: left 0.6s;
}

.partner-logo-section:hover::after {
    left: 100%;
}

/* will-change: transform należy dodać przez JavaScript tylko podczas animacji dla lepszej wydajności */
/* 
   OPTYMALIZACJA ANIMACJI - implementacja w JavaScript:
   
   // Przed animacją
   element.style.willChange = 'transform';
   
   // Po animacji (w callback lub po timeout)
   element.style.willChange = 'auto';
*/

.partner-logo-section:hover,
.partner-logo-section:focus-within {
    border-color: var(--color-secondary);
    background-color: rgba(13, 158, 162, 0.05);
    box-shadow: 
        0 0 0 3px rgba(199, 214, 79, 0.2),
        0 8px 25px rgba(13, 158, 162, 0.15);
    transform: translateY(-2px);
}

.partner-logo-section:hover .partner-logo,
.partner-logo-section:focus-within .partner-logo {
    transform: translateY(-6px) scale(1.05) rotate(1deg);
    transition: transform 0.4s var(--easing-bounce);
}

.partner-logo {
    max-width: 120px;
    max-height: 58px;
    object-fit: contain;
    margin: 0 auto;
    display: block;
    transition: 
        transform 0.4s var(--easing-smooth),
        filter var(--animation-normal);
    position: relative;
    z-index: 2;
}

/* Efekt nasycenia kolorów logo na hover */
.partner-logo-section:hover .partner-logo {
    filter: saturate(1.2) brightness(1.05);
}

.partner-info {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-align: center;
}

.partner-name {
    color: var(--color-dark);
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 0.18em 0;
    line-height: 1.16;
    word-break: break-word;
    /* Animacja tekstu przy hover karty */
    transition: 
        color var(--animation-normal),
        transform var(--animation-normal);
    position: relative;
}

/* Animacja podkreślenia nazwy na hover karty */
.partner-name::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    transition: 
        width var(--animation-normal),
        left var(--animation-normal);
}

.partner-card:hover .partner-name::after {
    width: 100%;
    left: 0;
}

.partner-card:hover .partner-name {
    color: var(--color-primary);
    transform: translateY(-2px);
}

.partner-description {
    color: var(--color-text);
    font-size: 1.01rem;
    line-height: 1.55;
    opacity: 0.90;
    margin: 0 0 0.10em 0;
    word-break: break-word;
    font-weight: 400;
    /* Płynna animacja tekstu */
    transition: 
        opacity var(--animation-normal),
        transform var(--animation-normal);
}

.partner-card:hover .partner-description {
    opacity: 1;
    transform: translateY(-1px);
}

.partner-action {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.8rem;
    width: 100%;
}

/* >>> MNIEJSZY, DELIKATNY PRZYCISK <<< */
.partner-btn {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-dark) 100%);
    color: #fff;
    padding: 0.42rem 1.03rem;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.93rem;
    letter-spacing: 0.01em;
    border: none;
    outline: none;
    box-shadow: var(--shadow-light);
    display: inline-flex;
    align-items: center;
    gap: 0.32rem;
    position: relative;
    transition: 
        background var(--animation-fast), 
        color var(--animation-fast), 
        transform var(--animation-fast), 
        box-shadow var(--animation-fast);
    z-index: 1;
    overflow: hidden;
}

/* Efekt ripple na kliknięcie */
.partner-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.partner-btn:active::before {
    width: 300px;
    height: 300px;
}

.partner-btn:hover,
.partner-btn:focus {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #0b8a94 100%);
    color: #fff;
    transform: translateY(-2px) scale(1.05);
    box-shadow: 
        0 8px 25px rgba(13,158,162,0.25),
        0 4px 12px rgba(55,78,147,0.15);
    text-decoration: none;
}

/* Animacja pulsowania przycisku */
.partner-btn:focus-visible {
    outline: none;
    animation: buttonPulse 2s ease-in-out infinite;
}

@keyframes buttonPulse {
    0%, 100% { 
        box-shadow: 
            0 8px 25px rgba(13,158,162,0.25),
            0 4px 12px rgba(55,78,147,0.15);
    }
    50% { 
        box-shadow: 
            0 8px 25px rgba(13,158,162,0.35),
            0 4px 12px rgba(55,78,147,0.25),
            0 0 0 4px rgba(13,158,162,0.1);
    }
}

.partner-arrow {
    font-size: 1rem;
    transition: transform var(--animation-fast);
    display: inline-block;
}

.partner-btn:hover .partner-arrow {
    transform: translateX(4px) scale(1.1);
    animation: arrowBounce 0.6s ease-in-out;
}

@keyframes arrowBounce {
    0%, 100% { transform: translateX(4px) scale(1.1); }
    50% { transform: translateX(8px) scale(1.2); }
}

/* Animacja kaskadowa - bardziej płynna */
.partners-container .partner-card:nth-child(1) { --delay: 0.1s; }
.partners-container .partner-card:nth-child(2) { --delay: 0.2s; }
.partners-container .partner-card:nth-child(3) { --delay: 0.3s; }
.partners-container .partner-card:nth-child(4) { --delay: 0.4s; }
.partners-container .partner-card:nth-child(5) { --delay: 0.5s; }
.partners-container .partner-card:nth-child(6) { --delay: 0.6s; }
.partners-container .partner-card:nth-child(7) { --delay: 0.7s; }
.partners-container .partner-card:nth-child(8) { --delay: 0.8s; }

/* Prefers-reduced-motion: respektowanie preferencji użytkownika */
@media (prefers-reduced-motion: reduce) {
    .partners-grid,
    .partners-title,
    .partners-container,
    .partner-card,
    .partner-logo,
    .partner-name,
    .partner-description,
    .partner-btn,
    .partner-arrow,
    .partner-logo-section::after,
    .partner-btn::before {
        animation: none !important;
        transition: none !important;
    }
    
    .partners-grid {
        opacity: 1;
        transform: none;
    }
    
    .partners-title {
        opacity: 1;
        transform: none;
    }
    
    .partners-container {
        opacity: 1;
    }
    
    .partner-card {
        opacity: 1;
        transform: none;
    }
}

/* Dark mode (opcja, działa automatycznie przy systemowym dark) */
@media (prefers-color-scheme: dark) {
    .partners-grid {
        background: var(--color-dark);
    }
    .partner-card {
        background: var(--color-dark);
        box-shadow: 0 6px 24px 0 rgba(55, 78, 147, 0.21);
        border: 1.7px solid var(--color-accent);
    }
    .partner-card:focus-within {
        border-color: var(--color-accent);
    }
    .partners-title,
    .partner-name {
        color: var(--color-accent);
    }
    .partner-description {
        color: #e5eed6;
    }
    .partner-btn {
        background: var(--color-secondary);
    }
    .partner-btn:hover, .partner-btn:focus {
        background: var(--color-accent);
        color: var(--color-dark);
    }
}