:root {
    --bg-color: #0c0c0e;
    --surface-color: #1a1a1d;
    --accent-color: #007aff;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a5;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition-speed: 0.8s;
}

* {
    margin: 0;
    padding: 0;
    box-box-sizing: border-box;
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#app {
    position: relative;
    height: 100%;
    width: 100%;
}

/* Slideshow Styles */
#slideshow-container {
    position: relative;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #1a1a2e 0%, #0c0c0e 100%);
}

#slide-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-speed) ease-in-out;
}

.slide.active {
    opacity: 1;
}

.image-container {
    width: 90%;
    height: 90%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#display-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border-radius: 8px;
    animation: zoomIn 1s ease-out;
}

@keyframes zoomIn {
    from { transform: scale(0.98); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* Timer Progress */
#timer-progress-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 10;
}

#timer-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
}

/* Status Info */
#status-info {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    z-index: 10;
}

/* Floating Action Button */
.fab {
    position: absolute;
    bottom: 30px;
    right: 30px;
    padding: 12px 24px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.3);
    transition: transform 0.3s, background 0.3s;
    z-index: 20;
}

.fab:hover {
    transform: translateY(-5px);
    background: #006ae6;
}

.fab svg {
    fill: currentColor;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.3s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--surface-color);
    padding: 40px;
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.modal h2 {
    margin-bottom: 8px;
    font-weight: 600;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.input-group input[type="text"] {
    width: 100%;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: white;
    outline: none;
}

.file-drop-area {
    border: 2px dashed var(--glass-border);
    padding: 30px;
    text-align: center;
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.3s;
}

.file-drop-area:hover {
    border-color: var(--accent-color);
}

#preview-container {
    margin: 20px 0;
    text-align: center;
}

#file-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 30px;
}

button.primary {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

button.secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
}

.hidden {
    display: none !important;
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#upload-status {
    text-align: center;
    padding: 20px;
}