:root {
    --bg-dark: #101010;
    --bg-sidebar: #141414;
    --accent: #ff8037;
    --accent-glow: rgba(255, 128, 55, 0.15);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border: #202020;
    --glass-bg: rgba(18, 18, 18, 0.8);
    --glass-border: rgba(255, 255, 255, 0.05);
    --radius: 0.75rem;
    
    /* Fluid Sizing */
    --sidebar-width: clamp(280px, 20vw, 400px);
    --toggle-size: clamp(40px, 5vw, 48px);
    --font-base: clamp(0.875rem, 0.5vw + 0.75rem, 1.125rem);
}

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

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

.app-container {
    display: flex;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Sidebar Toggle (Hamburger) */
.sidebar-toggle {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    width: var(--toggle-size);
    height: var(--toggle-size);
    background: rgba(255, 255, 255, 0.6);
    border: 2px solid #000;
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    z-index: 100;
    transition: all 0.3s ease;
    backdrop-filter: blur(8px);
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: scale(1.05);
}

.sidebar-toggle span {
    display: block;
    width: 60%;
    height: 3px;
    background: #000;
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Toggle state when sidebar is visible */
.sidebar-toggle.on-sidebar {
    left: calc(var(--sidebar-width) - var(--toggle-size) - 1rem);
    top: 1.5rem;
}

/* Collapsed State */
.sidebar-collapsed .sidebar {
    width: 0;
    transform: translateX(-100%);
}

.sidebar-collapsed .content {
    width: 100%;
}

.sidebar-collapsed .sidebar-toggle {
    left: 1.5rem;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 10;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.search-container input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    color: white;
    font-family: inherit;
    transition: all 0.2s;
}

.search-container input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.nav-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
}

.nav-item {
    padding: 0.75rem 1rem;
    margin-bottom: 0.25rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent);
    font-weight: 600;
}

.nav-item svg {
    opacity: 0.5;
}

.nav-item.active svg {
    opacity: 1;
}

/* Sidebar Toggle Animation */
.sidebar-toggle.on-sidebar span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.sidebar-toggle.on-sidebar span:nth-child(2) {
    opacity: 0;
}
.sidebar-toggle.on-sidebar span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

/* Content Area */
.content {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
    background-image: 
        radial-gradient(circle at 50% 50%, rgba(255, 128, 55, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 100% 0%, rgba(255, 128, 55, 0.05) 0%, transparent 30%);
}

.viewer-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.empty-state {
    text-align: center;
    max-width: 25rem;
    padding: 2rem;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.empty-state h2 {
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.empty-state p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.svg-viewer {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.svg-viewer.hidden {
    display: none;
}

.svg-viewer svg {
    max-width: 100%;
    max-height: 100%;
}

/* Controls */
.controls {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    padding: 0.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

.controls button {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.5rem;
    border: none;
    background: var(--glass-bg);
    color: white;
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: 600;
    transition: all 0.2s;
}

.controls button:hover {
    background: var(--accent);
    color: var(--bg-dark);
}

#reset {
    width: auto;
    padding: 0 1rem;
    font-size: 0.875rem;
}

.divider {
    width: 1px;
    height: 1.5rem;
    background: var(--border);
    margin: 0 0.5rem;
}

.nav-status {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.file-name {
    text-transform: lowercase;
    min-width: 6.25rem;
    text-align: center;
}

.nav-btn {
    width: 2rem !important;
    height: 2rem !important;
    font-size: 1rem !important;
    background: transparent !important;
    border: 1px solid var(--border) !important;
}

.nav-btn:hover {
    background: var(--accent) !important;
    color: var(--bg-dark) !important;
    border-color: var(--accent) !important;
}

.hidden {
    display: none !important;
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--accent);
    font-weight: 500;
}

.loader::before {
    content: '';
    width: 1.5rem;
    height: 1.5rem;
    border: 3px solid var(--accent-glow);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Transitions */
.fade-enter {
    opacity: 0;
    transform: scale(0.98);
}

.fade-enter-active {
    opacity: 1;
    transform: scale(1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 0.375rem;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0.625rem;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    :root {
        --sidebar-width: min(320px, 85vw);
        --toggle-size: 44px;
    }

    .sidebar {
        position: fixed;
        width: var(--sidebar-width);
        height: 100%;
        box-shadow: 20px 0 50px rgba(0, 0, 0, 0.5);
        transform: translateX(0);
    }

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

    .sidebar-toggle.on-sidebar {
        left: calc(var(--sidebar-width) - var(--toggle-size) - 0.75rem);
        background: var(--bg-sidebar);
        border-color: var(--border);
    }
    
    .sidebar-toggle.on-sidebar span {
        background: white;
    }

    .content {
        width: 100% !important;
    }

    .controls {
        bottom: 1.25rem;
        right: 1.25rem;
        left: auto;
        padding: 0.5rem;
        gap: 0.375rem;
        background: rgba(20, 20, 20, 0.9);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    }

    .controls button {
        width: 2.75rem;
        height: 2.75rem;
        font-size: 1.1rem;
    }

    #reset {
        padding: 0 1rem;
    }

    .nav-status {
        margin-left: 0;
        padding-left: 0.5rem;
        border-left: 1px solid var(--border);
    }

    .file-name {
        display: none;
    }

    .divider {
        display: none;
    }

    .empty-state {
        padding: 1.5rem;
    }
    
    .empty-icon {
        font-size: 3rem;
    }
}

/* Landscape Mobile Optimizations */
@media (max-width: 900px) and (orientation: landscape) {
    :root {
        --sidebar-width: 280px;
    }
    
    .file-name {
        display: block;
        max-width: 9.375rem;
        font-size: 0.75rem;
    }
    
    .controls {
        bottom: 0.75rem;
        right: 0.75rem;
    }
}

@media (max-width: 480px) {
    :root {
        --sidebar-width: 85vw;
    }

    .sidebar-toggle.on-sidebar {
        left: calc(var(--sidebar-width) - var(--toggle-size) - 0.5rem);
    }
    
    .nav-status {
        gap: 0.25rem;
    }

    .controls button {
        width: 2.5rem;
        height: 2.5rem;
    }
}