.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 32px;
    animation: fadeIn 1s ease-out 0.3s both;
    padding-bottom: 60px;
    align-items: start;
}

.card {
    background: white;
    border-radius: 24px;
    padding: 36px;
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.05),
        0 10px 20px var(--shadow-blue);
    border: 1px solid rgba(168, 213, 226, 0.3);
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: cardAppear 0.6s ease-out backwards;
    backdrop-filter: blur(10px);
    cursor: pointer;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }
.card:nth-child(4) { animation-delay: 0.4s; }
.card:nth-child(5) { animation-delay: 0.5s; }
.card:nth-child(6) { animation-delay: 0.6s; }

.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--navy-blue), var(--soft-blue), var(--sky-blue));
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card::after {
    content: '💌';
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 32px;
    opacity: 0.15;
    transition: all 0.4s ease;
}

.card:hover {
    transform: translateY(-12px);
    box-shadow:
        0 8px 12px rgba(0, 0, 0, 0.08),
        0 20px 40px var(--shadow-blue);
    border-color: var(--soft-blue);
}

.card:hover::before { opacity: 1; }
.card:hover::after  { opacity: 0.4; transform: scale(1.15) rotate(-5deg); }

.card-header { position: relative; }

.card-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.card.expanded .card-content { margin-top: 24px; }

.card-toggle-icon {
    position: absolute;
    top: 36px;
    right: 36px;
    font-size: 20px;
    color: var(--soft-blue);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.card-title {
    font-family: 'Playfair Display', serif;
    font-size: 28px;
    color: var(--navy-blue);
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    padding-bottom: 12px;
}

.card-title::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--soft-blue), transparent);
    border-radius: 3px;
}

.card-message {
    font-family: 'Inter', sans-serif;
    font-size: 17px;
    line-height: 1.8;
    color: #4a4a4a;
    font-weight: 400;
    letter-spacing: 0.2px;
    padding-top: 8px;
}

.card-date {
    font-family: 'Mrs Saint Delafield', cursive;
    font-size: 32px;
    color: var(--deep-navy);
    text-align: right;
    position: relative;
    padding-top: 12px;
}

.card-date::before {
    content: 'From,';
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-style: normal;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    position: absolute;
    top: -8px;
    right: 0;
    color: var(--soft-blue);
    background: white;
    padding: 0 8px;
}

.pinned-card {
    position: relative;
    margin-bottom: 48px;
    display: flex;
    flex-direction: column;
    align-items: flex-start; 
}

.pinned-card .card {
    width: 100%;
    max-width: 520px;
    border: 2px solid rgba(44, 95, 126, 0.25);
    box-shadow: 0 4px 24px rgba(44, 95, 126, 0.15);
}

.pinned-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 600;
    color: var(--navy-blue);
    background: linear-gradient(135deg,
        rgba(44, 95, 126, 0.1),
        rgba(90, 155, 212, 0.1));
    border: 1px solid rgba(44, 95, 126, 0.2);
    border-radius: 20px;
    padding: 5px 14px;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.pinned-card::after {
    content: '';
    display: block;
    height: 1px;
    background: linear-gradient(90deg,
        transparent,
        rgba(168, 213, 226, 0.5),
        transparent);
    margin-top: 40px;
    width: 100%;
}

.chapter-block {
    margin-bottom: 56px;
    animation: fadeIn 0.5s ease-out;
}

.chapter-header {
    margin-bottom: 24px;
    padding-left: 8px;
}

.chapter-title-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
}

.chapter-icon { font-size: 28px; }

.chapter-title {
    font-family: 'Mrs Saint Delafield', cursive;
    font-size: clamp(36px, 5vw, 52px);
    color: var(--navy-blue);
    font-weight: 400;
}

.chapter-description {
    font-family: 'Playfair Display', serif;
    font-size: 16px;
    color: var(--deep-navy);
    font-style: italic;
    padding-left: 40px;
}

.chapter-cards { position: relative; }

.chapter-cards::before {
    content: '';
    position: absolute;
    left: -16px; top: 0; bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--navy-blue), transparent);
    border-radius: 3px;
}

.empty-state {
    text-align: center;
    padding: 100px 20px;
    color: var(--navy-blue);
    font-family: 'Playfair Display', serif;
    font-size: 26px;
    font-style: italic;
    grid-column: 1 / -1;
}

.empty-state::before {
    content: '💝';
    display: block;
    font-size: 90px;
    margin-bottom: 24px;
    animation: pulse 2s ease-in-out infinite;
}

.empty-state.small { font-size: 16px; padding: 40px 20px; }
.empty-state.small::before { font-size: 48px; margin-bottom: 12px; }

.card-download {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--sky-blue);
    text-align: center;
    display: flex;
    justify-content: center;
}

.download-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    background: linear-gradient(135deg, var(--navy-blue), var(--soft-blue));
    color: white;
    text-decoration: none;
    border-radius: 16px;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(44, 95, 126, 0.3);
    position: relative;
    overflow: hidden;
}

.download-link::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.download-link:hover::before { left: 100%; }

.download-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(44, 95, 126, 0.4);
    background: linear-gradient(135deg, var(--soft-blue), var(--sky-blue));
}

.download-link:active {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(44, 95, 126, 0.3);
}

.download-icon { font-size: 24px; animation: bounce 2s infinite; }
.download-text { letter-spacing: 0.5px; }
.download-arrow { font-size: 20px; transition: transform 0.3s ease; }
.download-link:hover .download-arrow { transform: translateX(5px); }

@media (max-width: 768px) {
    .cards-grid     { grid-template-columns: 1fr; gap: 24px; }
    .card           { padding: 28px; }
    .card-title     { font-size: 24px; }
    .card-message   { font-size: 16px; }
    .card-toggle-icon { top: 28px; right: 28px; font-size: 18px; }
    .download-link  { padding: 14px 24px; font-size: 15px; }
    .download-icon  { font-size: 22px; }
    .download-arrow { font-size: 18px; }
}

@media (max-width: 480px) {
    .card           { padding: 24px; }
    .card-title     { font-size: 22px; }
    .card-date      { font-size: 28px; }
    .card-toggle-icon { top: 24px; right: 24px; font-size: 16px; }
    .download-link  { padding: 12px 20px; font-size: 14px; gap: 10px; }
    .card-download  { margin-top: 20px; padding-top: 20px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1400px) {
    .cards-grid { grid-template-columns: repeat(3, 1fr); }
}