@keyframes shake {
    0%,
    to {
        transform: translateX(0);
    }
    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }
    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

@keyframes fadeIn {
    0% {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes dropdownFade {
    0% {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse-soft {
    0%,
    to {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

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

@font-face {
    font-family: "Novem";
    src: url(novem.regular.ttf) format("truetype");
}

@font-face {
    font-family: "Dited";
    src: url(dited.regular.ttf) format("truetype");
}

h1 {
    font-family: "Novem", sans-serif;
    letter-spacing: 10px;
}

.book-id,
.book-status,
h2,
nav ul li a {
    font-family: "Dited", sans-serif;
    letter-spacing: 2.5px;
    font-size: large;
}

.custom-checkbox {
    display: inline-block;
    position: relative;
    cursor: pointer;
    font-size: 14px;
    user-select: none;
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    height: 18px;
    width: 18px;
    background-color: #fff;
    border: 2px solid #d1d5db;
    border-radius: 4px;
    transition: all 0.2s ease;
    display: inline-block;
    margin-right: 8px;
}

.custom-checkbox:hover input ~ .checkmark {
    border-color: #6b7280;
}

.custom-checkbox input:checked ~ .checkmark {
    background-color: #6b7280;
    border-color: #6b7280;
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.custom-checkbox input:checked ~ .checkmark:after {
    display: block;
}

.custom-checkbox .checkmark:after {
    left: 6.5px;
    top: 6px;
    width: 4px;
    height: 8px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.auth-tab {
    font-family: "Dited", sans-serif;
    letter-spacing: 1.5px;
}

input:focus {
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.7;
}

#login-form,
#register-form {
    animation: fadeIn 0.3s ease-in-out;
}

.flex.justify-center.gap-4 button:hover {
    transform: translateY(-2px);
}

.shake {
    animation: shake 0.5s ease-in-out;
}

#req-digit,
#req-length,
#req-lower,
#req-upper {
    transition: color 0.2s ease;
}

.req-icon {
    font-size: 10px;
    width: 12px;
    display: inline-block;
}

#login-form:not(.hidden),
#register-form:not(.hidden) {
    animation: fadeIn 0.3s ease-in-out;
}

#login-tab,
#register-tab {
    font-family: "Dited", sans-serif;
    letter-spacing: 1.5px;
    cursor: pointer;
}

#user-dropdown {
    animation: dropdownFade 0.1s ease-out;
}

#user-arrow.rotate-180 {
    transform: rotate(180deg);
}

.stat-number {
    font-variant-numeric: tabular-nums;
}

.stat-card {
    min-width: 140px;
}

.animate-pulse-soft {
    animation: pulse-soft 2s ease-in-out infinite;
}

#bookSvg {
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

.animate-fade-in-up {
    animation: fadeInUp 0.5s ease-out forwards;
}

.stat-card:hover svg {
    transform: scale(1.1);
}

.stat-card svg,
.stat-card:hover svg {
    transition: transform 0.3s ease;
}

.gradient-text {
    background: linear-gradient(135deg, #374151 0, #6b7280 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

footer a {
    color: #9ca3af;
    text-decoration: none;
    transition: all 0.25s ease;
    position: relative;
}

footer a::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: #fff;
    transition: width 0.25s ease;
}

footer a:hover {
    color: #fff;
}

footer a:hover::after {
    width: 100%;
}