/* ===========================
   Global
=========================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #000;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    overflow: hidden;
    user-select: none;
}

/* ===========================
   Login Screen
=========================== */

#login-screen {
    position: fixed;
    inset: 0;

    display: flex;
    justify-content: center;
    align-items: center;

    background: #000;

    transition: opacity 0.4s ease;
    z-index: 1000;
}

#login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#logo {
    width: 180px;
    margin-bottom: 35px;
}

#password {
    width: 280px;
    padding: 12px 16px;

    background: transparent;
    color: white;

    border: 1px solid #444;
    border-radius: 4px;

    font-size: 16px;
    text-align: center;

    outline: none;

    transition: border-color .2s;
}

#password:focus {
    border-color: white;
}

#password::placeholder {
    color: #777;
}

#login-error {
    margin-top: 15px;
    height: 20px;

    color: #ff4a4a;
    font-size: 14px;
}

/* ===========================
   Gallery Screen
=========================== */

#gallery-screen {
    position: fixed;
    inset: 0;

    display: flex;

    opacity: 1;
    transition: opacity .4s ease;
}

/* ===========================
   Sidebar
=========================== */

#sidebar {
    position: absolute;
    top: 30px;
    left: 30px;

    display: flex;
    flex-direction: column;
    gap: 18px;

    z-index: 10;
}

.gallery-button {
    color: #999;
    cursor: pointer;
    font-size: 18px;

    transition: color .2s;
}

.gallery-button:hover {
    color: white;
}

.gallery-button.active {
    color: white;
}

/* ===========================
   Slideshow
=========================== */

#viewer {
    width: 100vw;
    height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;

    position: relative;
}

#slideshow-image {
    max-width: 80%;
    max-height: 80%;

    object-fit: contain;

    transition: opacity .25s ease;
}

/* ===========================
   Navigation
=========================== */

.nav-button {
    position: absolute;

    background: transparent;
    border: none;

    color: white;

    font-size: 40px;

    cursor: pointer;

    opacity: .4;
    transition: opacity .2s;
}

.nav-button:hover {
    opacity: 1;
}

#prev {
    left: 40px;
}

#next {
    right: 40px;
}

/* ===========================
   Hidden
=========================== */

.hidden {
    display: none;
}

/* ===========================
   Fade Out
=========================== */

.fade-out {
    opacity: 0;
    pointer-events: none;
}

/* ===========================
   Shake Animation
=========================== */

.shake {
    animation: shake .35s;
}

@keyframes shake {

    0%   { transform: translateX(0); }

    20%  { transform: translateX(-8px); }

    40%  { transform: translateX(8px); }

    60%  { transform: translateX(-6px); }

    80%  { transform: translateX(6px); }

    100% { transform: translateX(0); }

}