:root {
    --bg-color: #0f0f11;
    --surface-color: rgba(30, 30, 35, 0.7);
    --accent-color: #6c5ce7;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --thumb-size: 80px;
    --thumb-gap: 10px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

#app {
    display: flex;
    height: 100vh;
    width: 100vw;
    transition: all var(--transition-speed) ease;
}

/* Layout Modes */
#app.layout-bottom {
    flex-direction: column;
}

#app.layout-side {
    flex-direction: row;
}

/* Main Display */
.main-display {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #1a1a20 0%, #0f0f11 100%);
    overflow: hidden;
}

.image-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

#current-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.5s ease;
}

#current-image.loaded {
    opacity: 1;
}

/* Controls Overlay */
.controls {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 30px;
    border: var(--glass-border);
    z-index: 10;
}

.control-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s, transform 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.control-btn:active {
    transform: scale(0.95);
}

.hidden {
    display: none;
}

/* Settings Panel */
.settings-panel {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    display: flex;
    gap: 10px;
    align-items: center;
}

.setting-group {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    padding: 4px 12px;
    border-radius: 12px;
    border: var(--glass-border);
    color: var(--text-secondary);
}

.setting-group input[type="range"] {
    width: 80px;
    accent-color: var(--accent-color);
    cursor: pointer;
}

.layout-toggles {
    display: flex;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    padding: 4px;
    border-radius: 12px;
    border: var(--glass-border);
}

.layout-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 8px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.layout-btn:hover {
    color: var(--text-primary);
}

.layout-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
}

/* Thumbnail Strip */
.thumbnail-strip {
    background: rgba(15, 15, 17, 0.95);
    border-top: var(--glass-border);
    z-index: 5;
    transition: all var(--transition-speed) ease;
}

/* Bottom Layout Specifics */
#app.layout-bottom .thumbnail-strip {
    height: 120px;
    width: 100%;
    border-top: var(--glass-border);
    border-left: none;
}

#app.layout-bottom .thumbnails-scroll {
    display: flex;
    flex-direction: row;
    align-items: center;
    height: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0 20px;
    gap: var(--thumb-gap);
}

/* Side Layout Specifics */
#app.layout-side .thumbnail-strip {
    width: 140px;
    height: 100%;
    border-left: var(--glass-border);
    border-top: none;
}

#app.layout-side .thumbnails-scroll {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px 0;
    gap: var(--thumb-gap);
}

/* Scrollbar Styling */
.thumbnails-scroll::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.thumbnails-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.thumbnails-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

/* Thumbnail Items */
.thumb-item {
    width: var(--thumb-size);
    height: var(--thumb-size);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
    flex-shrink: 0;
    position: relative;
}

.thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.thumb-item:hover img {
    transform: scale(1.1);
}

.thumb-item.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 15px rgba(108, 92, 231, 0.4);
}