:root {
    /* Colors - Inspired by Google Photos */
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;

    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-tertiary: #80868b;

    --border-color: #dadce0;
    --hover-bg: #f1f3f4;
    --active-bg: #e8f0fe;

    --sidebar-width: 280px;
    --header-height: 64px;

    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 8px 12px 6px rgba(60, 64, 67, 0.15), 0 4px 4px 0 rgba(60, 64, 67, 0.3);

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    overflow-x: hidden;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 22px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    margin-bottom: 4px;
    border-radius: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.nav-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--active-bg);
    color: var(--primary-color);
}

.nav-item svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
}

.storage-info {
    font-size: 12px;
    color: var(--text-secondary);
}

.storage-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}

.storage-used {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 3px;
    transition: width var(--transition-normal);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 50;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: 1;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-secondary);
    transition: background var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--hover-bg);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: 10px 20px;
    max-width: 600px;
    flex: 1;
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

.search-box svg {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    font-size: 14px;
    width: 100%;
    color: var(--text-primary);
}

.search-box input::placeholder {
    color: var(--text-tertiary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-button {
    background: none;
    border: none;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.icon-button:active {
    transform: scale(0.95);
}

/* Content Area */
.content-area {
    flex: 1;
    padding: 24px;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    gap: 16px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-state p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    gap: 16px;
    text-align: center;
}

.empty-state h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.primary-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 32px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.primary-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.primary-button:active {
    transform: translateY(0);
}

/* Photos Container */
.photos-container {
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.timeline-section {
    margin-bottom: 48px;
}

.timeline-header {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding: 0 4px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.timeline-date {
    font-size: 22px;
}

.timeline-count {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 400;
}

.photos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
    margin-bottom: 24px;
}

.photo-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-tertiary);
    transition: all var(--transition-fast);
}

.photo-item:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.photo-item img,
.photo-item video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.photo-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.6) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
    display: flex;
    align-items: flex-end;
    padding: 12px;
}

.photo-item:hover .photo-overlay {
    opacity: 1;
}

.photo-info {
    color: white;
    font-size: 12px;
    font-weight: 500;
}

.video-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

.favorite-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    color: #ff4757;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    animation: modalFadeIn var(--transition-normal);
}

.modal.active {
    display: block;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 10;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    display: flex;
    width: 100%;
    height: 100%;
}

.media-viewer {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 60px 20px;
}

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

.media-display img,
.media-display video {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    color: white;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    opacity: 0.7;
}

.nav-arrow:hover {
    background: rgba(255, 255, 255, 0.2);
    opacity: 1;
    transform: translateY(-50%) scale(1.1);
}

.nav-prev {
    left: 20px;
}

.nav-next {
    right: 20px;
}

.media-info {
    width: 360px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    padding: 32px 24px;
    overflow-y: auto;
    color: white;
}

.media-info h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
}

.metadata-group {
    margin-bottom: 24px;
}

.metadata-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.metadata-value {
    font-size: 14px;
    color: white;
    margin-bottom: 4px;
}

.metadata-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
}

.metadata-row-label {
    color: rgba(255, 255, 255, 0.7);
}

.metadata-row-value {
    color: white;
    font-weight: 500;
}

/* Upload Progress */
.upload-progress {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: white;
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: var(--shadow-lg);
    min-width: 320px;
    z-index: 999;
    animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
    from {
        transform: translateY(100px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.upload-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
}

.upload-info span:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

.upload-info span:last-child {
    color: var(--text-secondary);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 3px;
    transition: width var(--transition-fast);
}

/* Responsive */
@media (max-width: 1024px) {
    .media-info {
        width: 300px;
    }

    .photos-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 0;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .media-info {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: 50vh;
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        transform: translateY(100%);
        transition: transform var(--transition-normal);
    }

    .media-info.active {
        transform: translateY(0);
    }

    .photos-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 4px;
    }

    .nav-arrow {
        width: 44px;
        height: 44px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Reproductor de Audio */
.audio-player {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 40px;
    max-width: 600px;
    margin: 0 auto;
    gap: 30px;
}

.audio-artwork {
    position: relative;
    animation: rotateDisc 20s linear infinite;
    filter: drop-shadow(0 10px 30px rgba(102, 126, 234, 0.4));
}

@keyframes rotateDisc {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.audio-disc {
    display: block;
}

.audio-info {
    text-align: center;
    width: 100%;
}

.audio-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    margin: 0 0 12px 0;
    line-height: 1.3;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.audio-duration {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    font-weight: 500;
}

.audio-controls {
    width: 100%;
    max-width: 500px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.audio-controls::-webkit-media-controls-panel {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
}

.audio-controls::-webkit-media-controls-play-button,
.audio-controls::-webkit-media-controls-pause-button {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
}

.audio-controls::-webkit-media-controls-current-time-display,
.audio-controls::-webkit-media-controls-time-remaining-display {
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}