:root {
    /* Catppuccin Frappe Color Scheme */
    --primary: #8caaee;
    --primary-hover: #babbf1;
    --danger: #e78284;
    --danger-hover: #ea999c;
    --secondary: #838ba7;
    --bg: #303446;
    --bg-light: #414559;
    --text: #c6d0f5;
    --text-dim: #a5adce;
    --border: #51576d;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Screens */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* Auth Screen */
#auth-screen .container {
    max-width: 500px;
    margin: 0 auto;
    padding: 60px 20px;
    text-align: center;
}

#auth-screen h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

#auth-screen .subtitle {
    font-size: 1.1rem;
    color: var(--text-dim);
    margin-bottom: 3rem;
}

#google-signin {
    margin: 2rem 0;
    display: flex;
    justify-content: center;
}

#auth-screen .info {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-top: 2rem;
}

/* Header */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    gap: 1rem;
    flex-wrap: wrap;
}

header h2 {
    margin: 0;
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* Buttons */
button {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--secondary);
    color: white;
}

.btn-secondary:hover {
    background: #4a4f54;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: var(--danger-hover);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Picker Screen */
#picker-screen .container {
    max-width: 700px;
    margin: 0 auto;
    padding: 40px 20px;
}

#picker-screen header {
    background: transparent;
    border-bottom: none;
    padding: 0 0 20px 0;
}

.picker-content {
    text-align: center;
}

.picker-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.picker-content .info {
    font-size: 1rem;
    color: var(--text-dim);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    margin: 2rem 0;
}

.status-message {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 4px;
    background: var(--bg-light);
    border-left: 4px solid var(--primary);
}

.info-box {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 3rem;
    text-align: left;
}

.info-box p {
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    color: var(--text-dim);
}

.info-box p:last-child {
    margin-bottom: 0;
}

.info-box strong {
    color: var(--text);
}

/* Loading Spinner */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading p {
    margin-top: 1rem;
    color: var(--text-dim);
}

/* Albums Grid */
.albums-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
}

.album-card {
    background: var(--bg-light);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.album-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

.album-cover {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    background: var(--border);
}

.album-info {
    padding: 1rem;
}

.album-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.album-count {
    color: var(--text-dim);
    font-size: 0.9rem;
}

/* Slideshow Controls */
.slideshow-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 2rem;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.slideshow-controls label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.slideshow-controls select {
    padding: 0.4rem 0.8rem;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
}

.slideshow-controls input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Slideshow Container */
#slideshow-container {
    position: relative;
    width: 100%;
    height: calc(100vh - 180px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: black;
    overflow: hidden;
}

#photo-display {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.slideshow-photo {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
    pointer-events: none;
}

.slideshow-photo.active {
    opacity: 1;
    pointer-events: auto;
}

/* Ken Burns effect animations */
.slideshow-photo.ken-burns {
    animation-duration: 10s;
    animation-timing-function: ease-in-out;
    animation-fill-mode: both;
}

@keyframes kenBurnsZoomIn {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.15) translate(0, 0); }
}

@keyframes kenBurnsZoomOut {
    0% { transform: scale(1.15) translate(0, 0); }
    100% { transform: scale(1) translate(0, 0); }
}

@keyframes kenBurnsPanLeft {
    0% { transform: scale(1.15) translate(3%, 0); }
    100% { transform: scale(1.15) translate(-3%, 0); }
}

@keyframes kenBurnsPanRight {
    0% { transform: scale(1.15) translate(-3%, 0); }
    100% { transform: scale(1.15) translate(3%, 0); }
}

@keyframes kenBurnsZoomPanDiagonal1 {
    0% { transform: scale(1) translate(-2%, -2%); }
    100% { transform: scale(1.2) translate(2%, 2%); }
}

@keyframes kenBurnsZoomPanDiagonal2 {
    0% { transform: scale(1) translate(2%, -2%); }
    100% { transform: scale(1.2) translate(-2%, 2%); }
}

@keyframes kenBurnsZoomPanDiagonal3 {
    0% { transform: scale(1.2) translate(-2%, 2%); }
    100% { transform: scale(1) translate(2%, -2%); }
}

@keyframes kenBurnsZoomPanDiagonal4 {
    0% { transform: scale(1.2) translate(2%, 2%); }
    100% { transform: scale(1) translate(-2%, -2%); }
}

.photo-counter {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    z-index: 10;
}

/* Navigation Buttons */
.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: white;
    border: none;
    font-size: 3rem;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: background 0.2s;
    z-index: 10;
}

.nav-btn:hover {
    background: rgba(0,0,0,0.8);
}

.nav-prev {
    left: 0;
}

.nav-next {
    right: 0;
}

/* Error Message */
.error-message {
    background: var(--danger);
    color: white;
    padding: 1rem 2rem;
    margin: 1rem 2rem;
    border-radius: 4px;
}

:root {
    --error: var(--danger);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-light);
    color: var(--text);
    padding: 1rem 2rem;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    transition: transform 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }
    
    .albums-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
        padding: 1rem;
    }
    
    .slideshow-controls {
        padding: 1rem;
        gap: 1rem;
    }
    
    .nav-btn {
        font-size: 2rem;
        padding: 0.5rem 1rem;
    }
}