:root {
    --bg-dark: #0f1115;
    --bg-darker: #08090b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-glow: rgba(99, 102, 241, 0.15);
    --danger: #ef4444;
    --success: #10b981;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-darker);
    color: var(--text-main);
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.08), transparent 25%);
    height: 100vh;
    width: 100vw;
}

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

.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease, transform 0.4s ease;
    transform: scale(0.98);
}

.page.active {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

#landing-page {
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.main-panel {
    width: 100%;
    max-width: 600px;
    border-radius: 24px;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.logo-container {
    text-align: center;
}

.logo-icon {
    font-size: 3.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 15px var(--glass-glow));
    animation: pulse 3s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); filter: drop-shadow(0 0 15px var(--glass-glow)); }
    100% { transform: scale(1.05); filter: drop-shadow(0 0 25px var(--primary)); }
}

.logo-container h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #fff, #a5b4fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-container p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

.action-cards {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.card {
    flex: 1;
    min-width: 280px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2), inset 0 0 20px var(--glass-glow);
}

.card i {
    font-size: 2.5rem;
    color: var(--text-main);
    margin-bottom: 1rem;
    display: block;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.join-input-group {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.5rem;
    width: 100%;
    max-width: 240px;
}

.join-input-group input {
    flex: 1;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    text-transform: uppercase;
}

.join-input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 10px var(--glass-glow);
}

.join-input-group button {
    background: var(--primary);
    color: white;
    border: none;
    width: 44px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.join-input-group button:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.features-text {
    margin-top: 3rem;
    display: flex;
    gap: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    flex-wrap: wrap;
    justify-content: center;
}

.features-text span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.room-header {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 100;
    border-radius: 0 0 24px 24px;
    border-top: none;
    margin: 0 1rem;
}

.room-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.role-badge {
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.room-code-display {
    font-size: 1.1rem;
    color: var(--text-muted);
}

#current-room-code {
    color: var(--text-main);
    letter-spacing: 2px;
}

.host-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 0 15px var(--glass-glow);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-icon {
    background: rgba(255, 255, 255, 0.05);
    color: white;
    padding: 0.5rem;
    border-radius: 10px;
}
.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
}

.pagination {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(0,0,0,0.3);
    padding: 0.3rem;
    border-radius: 14px;
    border: 1px solid var(--glass-border);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.sync-status {
    color: var(--success);
    font-size: 1.2rem;
    filter: drop-shadow(0 0 5px rgba(16, 185, 129, 0.5));
}
.sync-status.offline {
    color: var(--danger);
    filter: none;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255,255,255,0.1);
    transition: .4s;
    border: 1px solid var(--glass-border);
}
.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}
input:checked + .slider {
    background-color: var(--primary);
    border-color: var(--primary);
}
input:checked + .slider:before {
    transform: translateX(20px);
}
.slider.round {
    border-radius: 24px;
}
.slider.round:before {
    border-radius: 50%;
}

.canvas-container {
    flex: 1;
    position: relative;
    margin: 1rem;
    border-radius: 20px;
    overflow: auto; /* Allow scrolling when zoomed */
    background: #1e2025;
    border: 1px solid var(--glass-border);
    box-shadow: inset 0 0 30px rgba(0,0,0,0.5);
    touch-action: none;
    display: grid;
    place-items: center;
}

#canvas-viewport {
    position: relative;
    display: grid;
    grid-template-areas: "canvas";
    transform-origin: center center;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
    cursor: grab;
}

#pdf-canvas, #draw-canvas {
    grid-area: canvas;
    width: 100%;
    height: 100%;
    display: block;
}

#draw-canvas.panning {
    cursor: grabbing;
}

#draw-canvas {
    z-index: 2;
    cursor: crosshair;
}

.toolbar {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.6rem 1.2rem;
    border-radius: 24px;
    z-index: 200;
    max-width: 95vw;
    flex-wrap: nowrap;
    overflow-x: auto;
    transition: opacity 0.5s ease, transform 0.5s ease, visibility 0.5s;
    opacity: 1;
    visibility: visible;
}

.toolbar.toolbar-hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

.tool-group {
    display: flex;
    gap: 0.3rem;
    align-items: center;
}

.tool-btn {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.tool-btn.active {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary);
    box-shadow: inset 0 0 10px rgba(99, 102, 241, 0.1);
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--glass-border);
    flex-shrink: 0;
}

.color-picker {
    display: flex;
    gap: 0.4rem;
    align-items: center;
}

.color-swatch {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.2s;
}

.color-swatch.active {
    transform: scale(1.2);
    border-color: white;
}

.custom-color-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    width: 28px;
    height: 28px;
}

#custom-color-picker {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.zoom-label {
    font-size: 0.85rem;
    color: var(--text-main);
    min-width: 45px;
    text-align: center;
    font-weight: 600;
}

#draw-disabled-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(239, 68, 68, 0.1);
    backdrop-filter: blur(8px);
    color: var(--danger);
    padding: 1rem 2rem;
    border-radius: 20px;
    border: 1px solid rgba(239, 68, 68, 0.2);
    font-weight: 600;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    pointer-events: none;
}

#toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    z-index: 1000;
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    .toolbar {
        bottom: 1rem;
        border-radius: 16px;
    }
}